stb.c

/*
 * Unit tests for "stb.h"
 */

//#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <stdlib.h>

#ifdef _WIN32
#include <crtdbg.h>
#endif

//#define STB_FASTMALLOC
#ifdef _DEBUG
#define STB_MALLOC_WRAPPER_DEBUG
#endif
#ifndef _M_AMD64
#define STB_NPTR
#endif
#define STB_DEFINE
#include "stb.h"

//#include "stb_file.h"
//#include "stb_pixel32.h"

//#define DEBUG_BLOCK
#ifdef DEBUG_BLOCK
#include <conio.h>
#endif

#ifdef STB_FASTMALLOC
#error "can't use FASTMALLOC with threads"
#endif

int count;
void c(int truth, char *error)
{
   if (!truth) {
      fprintf(stderr, "Test failed: %s\n", error);
      ++count;
   }
}


#if 0
void show(void)
{
   #ifdef _WIN32
   SYSTEM_INFO x;
   GetSystemInfo(&x);
   printf("%d\n", x.dwPageSize);
   #endif
}
#endif

void test_classes(void)
{
   unsigned char size_base[32], size_shift[32];
   int class_to_pages[256];
   int class_to_size[256], cl;
   int lg, size, wasted_pages;
   int kAlignShift = 3;
   int kAlignment = 1 << kAlignShift;
   int kMaxSize = 8 * 4096;
   int kPageShift = 12;
   int kPageSize = (1 << kPageShift);
  int next_class = 1;
  int alignshift = kAlignShift;
  int last_lg = -1;

  for (lg = 0; lg < kAlignShift; lg++) {
    size_base[lg] = 1;
    size_shift[lg] = kAlignShift;
  }

  for (size = kAlignment; size <= kMaxSize; size += (1 << alignshift)) {
    int lg = stb_log2_floor(size);
    if (lg > last_lg) {
      // Increase alignment every so often.
      //
      // Since we double the alignment every time size doubles and
      // size >= 128, this means that space wasted due to alignment is
      // at most 16/128 i.e., 12.5%.  Plus we cap the alignment at 256
      // bytes, so the space wasted as a percentage starts falling for
      // sizes > 2K.
      if ((lg >= 7) && (alignshift < 8)) {
        alignshift++;
      }
      size_base[lg] = next_class - ((size-1) >> alignshift);
      size_shift[lg] = alignshift;
    }

    class_to_size[next_class] = size;
    last_lg = lg;

    next_class++;
  }

  // Initialize the number of pages we should allocate to split into
  // small objects for a given class.
  wasted_pages = 0;
  for (cl = 1; cl < next_class; cl++) {
    // Allocate enough pages so leftover is less than 1/8 of total.
    // This bounds wasted space to at most 12.5%.
    size_t psize = kPageSize;
    const size_t s = class_to_size[cl];
    while ((psize % s) > (psize >> 3)) {
      psize += kPageSize;
    }
    class_to_pages[cl] = psize >> kPageShift;
    wasted_pages += psize;
  }

  printf("TCMalloc can waste as much as %d memory on one-shot allocations\n", wasted_pages);


  return;
}

#ifdef STB_STUA
void test_script(void)
{
   stua_run_script(
      "var g = (2+3)*5 + 3*(2+1) + ((7)); \n"
      "func sprint(x) _print(x) _print(' ') x end;\n"
      "func foo(y) var q = func(x) sprint(x) end; q end;\n "
      "var z=foo(5); z(77);\n"
      "func counter(z) func(x) z=z+1 end end\n"
      "var q=counter(0), p=counter(5);\n"
      "sprint(q()) sprint(p()) sprint(q()) sprint(p()) sprint(q()) sprint(p())\n"
      "var x=2222;\n"
      "if 1 == 2 then 3333 else 4444 end; => x; sprint(x);\n"
      "var x1 = sprint(1.5e3);  \n"
      "var x2 = sprint(.5);  \n"
      "var x3 = sprint(1.);  \n"
      "var x4 = sprint(1.e3);  \n"
      "var x5 = sprint(1e3);  \n"
      "var x6 = sprint(0.5e3);  \n"
      "var x7 = sprint(.5e3);  \n"
      " func sum(x,y) x+y end                                       \n"
      " func sumfunc(a) sum+{x=a} end                               \n"
      " var q = sumfunc(3) \n"
      " var p = sumfunc(20) \n"
      " var d = sprint(q(5)) - sprint(q(8)) \n"
      " var e = sprint(p(5)) - sprint(p(8)) \n"
      " func test3(x)       \n"
      "    sprint(x)         \n"
      "    x = x+3          \n"
      "    sprint(x)         \n"
      "    x+5              \n"
      " end                 \n"
      " var y = test3(4);   \n"
      " func fib(x)         \n"
      "    if x < 3 then    \n"
      "       1             \n"
      "    else             \n"
      "      fib(x-1) + fib(x-2); \n"
      "    end              \n"
      " end                 \n"
      "                     \n"
      " func fib2(x)        \n"
      "    var a=1          \n"
      "    var b=1          \n"
      "    sprint(a)        \n"
      "    sprint(b)        \n"
      "    while x > 2 do   \n"
      "       var c=a+b     \n"
      "       a=b           \n"
      "       b=c           \n"
      "       sprint(b)     \n"
      "       x=x-1         \n"
      "    end              \n"
      "    b                \n"
      " end                 \n"
      "                                                             \n"
      " func assign(z)                                              \n"
      "    var y = { 'this', 'is', 'a', 'lame', 'day', 'to', 'die'} \n"
      "    y[3] = z                                                 \n"
      "    var i = 0                                                \n"
      "    while y[i] != nil do                                     \n"
      "       sprint(y[i])                                          \n"
      "       i = i+1                                               \n"
      "    end                                                      \n"
      " end                                                         \n"
      "                                                             \n"
      " sprint(fib(12)); \n"
      " assign(\"good\"); \n"
      " fib2(20); \n"
      " sprint('ok'); \n"
      " sprint(-5); \n"
      " // final comment with no newline"
   );
}
#endif

#ifdef STB_THREADS
extern void __stdcall Sleep(unsigned long);

void * thread_1(void *x)
{
   Sleep(80);
   printf("thread 1\n"); fflush(stdout);
   return (void *) 2;
}

void * thread_2(void *y)
{
   stb_work(thread_1, NULL, y);
   Sleep(50);
   printf("thread 2\n"); fflush(stdout);
   return (void *) 3;
}

stb_semaphore stest;
stb_mutex mutex;
volatile int tc1, tc2;

void *thread_3(void *p)
{
   stb_mutex_begin(mutex);
   ++tc1;
   stb_mutex_end(mutex);
   stb_sem_waitfor(stest);
   stb_mutex_begin(mutex);
   ++tc2;
   stb_mutex_end(mutex);
   return NULL;
}

void test_threads(void)
{
   volatile int a=0,b=0;
   //stb_work_numthreads(2);
   stb_work(thread_2, (void *) &a, (void *) &b);
   while (a==0 || b==0) {
      Sleep(10);
      //printf("a=%d b=%d\n", a, b);
   }
   c(a==2 && b == 3, "stb_thread");
   stb_work_numthreads(4);
   stest = stb_sem_new(8);
   mutex = stb_mutex_new();
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   while (tc1 < 4)
      Sleep(10);
   c(tc1 == 4, "stb_work 1");
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   Sleep(40);
   while (tc1 != 8 || tc2 != 8)
      Sleep(10);
   c(tc1 == 8 && tc2 == 8, "stb_work 2");
   stb_work_numthreads(2);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   stb_work(thread_3, NULL, NULL);
   while (tc1 < 10)
      Sleep(10);
   c(tc1 == 10, "stb_work 1");
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);
   stb_sem_release(stest);

   Sleep(100);
   stb_sem_delete(stest);
   stb_mutex_delete(mutex);
}
#else
void test_threads(void)
{
}
#endif

void *thread4(void *p)
{
   return NULL;
}

#ifdef STB_THREADS
stb_threadqueue *tq;
stb_sync synch;
stb_mutex msum;

volatile int thread_sum;

void *consume1(void *p)
{
   volatile int *q = (volatile int *) p;
   for(;;) {
      int z;
      stb_threadq_get_block(tq, &z);
      stb_mutex_begin(msum);
      thread_sum += z;
      *q += z;
      stb_mutex_end(msum);
      stb_sync_reach(synch);
   }      
}

void test_threads2(void)
{
   int array[256],i,n=0;
   volatile int which[4];
   synch = stb_sync_new();
   stb_sync_set_target(synch,2);
   stb_work_reach(thread4, NULL, NULL, synch);
   stb_sync_reach_and_wait(synch);
   printf("ok\n");

   tq = stb_threadq_new(4, 1, TRUE,TRUE);
   msum = stb_mutex_new();
   thread_sum = 0;
   stb_sync_set_target(synch, 65);
   for (i=0; i < 4; ++i) {
      which[i] = 0;
      stb_create_thread(consume1, (int *) &which[i]);
   }
   for (i=1; i <= 64; ++i) {
      array[i] = i;
      n += i;
      stb_threadq_add_block(tq, &array[i]);
   }
   stb_sync_reach_and_wait(synch);
   stb_barrier();
   c(thread_sum == n, "stb_threadq 1");
   c(which[0] + which[1] + which[2] + which[3] == n, "stb_threadq 2");
   printf("(Distribution: %d %d %d %d)\n", which[0], which[1], which[2], which[3]);

   stb_sync_delete(synch);
   stb_threadq_delete(tq);
   stb_mutex_delete(msum);
}
#else
void test_threads2(void)
{
}
#endif

char tc[] = "testing compression test quick test voila woohoo what the hell";

char storage1[1 << 23];
int test_compression(char *buffer, int length)
{
   char *storage2;
   int c_len = stb_compress(storage1, buffer, length);
   int dc_len;
   printf("Compressed %d to %d\n", length, c_len);
   dc_len = stb_decompress_length(storage1);
   storage2 = malloc(dc_len);
   dc_len = stb_decompress(storage2, storage1, c_len);
   if (dc_len != length) { free(storage2); return -1; }
   if (memcmp(buffer, storage2, length) != 0) { free(storage2); return -1; }
   free(storage2);
   return c_len;
}

#if 0
int test_en_compression(char *buffer, int length)
{
   int c_len = stb_en_compress(storage1, buffer, length);
   int dc_len;
   printf("Encompressed %d to %d\n", length, c_len);
   dc_len = stb_en_decompress(storage2, storage1, c_len);
   if (dc_len != length) return -1;
   if (memcmp(buffer, storage2, length) != 0) return -1;
   return c_len;
}
#endif

#define STR_x "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
#define STR_y "yyyyyyyyyyyyyyyyyy"

#define STR_xy STR_x STR_y
#define STR_xyyxy STR_xy STR_y STR_xy

#define STR_1 "testing"
#define STR_2 STR_xyyxy STR_xy STR_xyyxy STR_xyyxy STR_xy STR_xyyxy
#define STR_3 "buh"

char buffer[] = STR_1 "\r\n" STR_2 STR_2 STR_2 "\n" STR_3;
char str1[] = STR_1;
char str2[] = STR_2 STR_2 STR_2;
char str3[] = STR_3;

int sum(short *s)
{
   int i,total=0;
   for (i=0; i < stb_arr_len(s); ++i)
      total += s[i];
   return total;
}

stb_uint stb_adler32_old(stb_uint adler32, stb_uchar *buffer, stb_uint buflen)
{
   const stb_uint ADLER_MOD = 65521;
   stb_uint s1 = adler32 & 0xffff;
   stb_uint s2 = adler32 >> 16;

   while (buflen-- > 0) { // NOTE: much faster implementations are possible!
      s1 += *buffer++; if (s1 > ADLER_MOD) s1 -= ADLER_MOD;
      s2 += s1       ; if (s2 > ADLER_MOD) s2 -= ADLER_MOD;
   }
   return (s2 << 16) + s1;
}

static int sample_test[3][5] =
{
   { 1,2,3,4,5 },
   { 6,7,8,9,10, },
   { 11,12,13,14,15 },
};

typedef struct { unsigned short x,y,z; } struct1;
typedef struct { double a; int x,y,z; } struct2;

char *args_raw[] = { "foo", "-dxrf", "bar", "-ts" };
char *args[8];

void do_compressor(int,char**);
void test_sha1(void);

int alloc_num, alloc_size;
void dumpfunc(void *ptr, int sz, char *file, int line)
{
   printf("%p (%6d)  -- %3d:%s\n", ptr, sz, line, file);
   alloc_size += sz;
   alloc_num  += 1;
}

char *expects(stb_matcher *m, char *s, int result, int len, char *str)
{
   int res2,len2=0;
   res2 = stb_lex(m, s, &len2);
   c(result == res2 && len == len2, str);
   return s + len;
}

void test_lex(void)
{
   stb_matcher *m = stb_lex_matcher();
   //         tok_en5 .3 20.1 20. .20 .1
   char *s = "tok_en5.3 20.1 20. .20.1";

   stb_lex_item(m, "[a-zA-Z_][a-zA-Z0-9_]*", 1   );
   stb_lex_item(m, "[0-9]*\\.?[0-9]*"      , 2   );
   stb_lex_item(m, "[\r\n\t ]+"            , 3   );
   stb_lex_item(m, "."                     , -99 );
   s=expects(m,s,1,7, "stb_lex 1");
   s=expects(m,s,2,2, "stb_lex 2");
   s=expects(m,s,3,1, "stb_lex 3");
   s=expects(m,s,2,4, "stb_lex 4");
   s=expects(m,s,3,1, "stb_lex 5");
   s=expects(m,s,2,3, "stb_lex 6");
   s=expects(m,s,3,1, "stb_lex 7");
   s=expects(m,s,2,3, "stb_lex 8");
   s=expects(m,s,2,2, "stb_lex 9");
   s=expects(m,s,0,0, "stb_lex 10");
   stb_matcher_free(m);
}

typedef struct Btest
{
   struct Btest stb_bst_fields(btest_);
   int v;
} Btest;

stb_bst(Btest, btest_, BT2,bt2,v, int, a - b)

void bst_test(void)
{
   Btest *root = NULL, *t;
   int items[500], sorted[500];
   int i,j,z;
   for (z=0; z < 10; ++z) {
      for (i=0; i < 500; ++i)
         items[i] = stb_rand() & 0xfffffff;

      // check for collisions, and retrry if so
      memcpy(sorted, items, sizeof(sorted));
      qsort(sorted, 500, sizeof(sorted[0]), stb_intcmp(0));
      for (i=1; i < 500; ++i)
         if (sorted[i-1] == sorted[i])
            break;
      if (i != 500) { --z; break; }

      for (i=0; i < 500; ++i)  {
         t = malloc(sizeof(*t));
         t->v = items[i];
         root = btest_insert(root, t);
         #ifdef STB_DEBUG
         btest__validate(root,1);
         #endif
         for (j=0; j <= i; ++j)
            c(btest_find(root, items[j]) != NULL, "stb_bst 1");
         for (   ; j < 500; ++j)
            c(btest_find(root, items[j]) == NULL, "stb_bst 2");
      }

      t = btest_first(root);
      for (i=0; i < 500; ++i)
         t = btest_next(root,t);
      c(t == NULL, "stb_bst 5");
      t = btest_last(root);
      for (i=0; i < 500; ++i)
         t = btest_prev(root,t);
      c(t == NULL, "stb_bst 6");

      memcpy(sorted, items, sizeof(sorted));
      qsort(sorted, 500, sizeof(sorted[0]), stb_intcmp(0));
      t = btest_first(root);
      for (i=0; i < 500; ++i) {
         assert(t->v == sorted[i]);
         t = btest_next(root, t);
      }
      assert(t == NULL);

      if (z==1)
         stb_reverse(items, 500, sizeof(items[0]));
      else if (z)
         stb_shuffle(items, 500, sizeof(items[0]), stb_rand());

      for (i=0; i < 500; ++i)  {
         t = btest_find(root, items[i]);
         assert(t != NULL);
         root = btest_remove(root, t);
         c(btest_find(root, items[i]) == NULL, "stb_bst 5");
         #ifdef STB_DEBUG
         btest__validate(root, 1);
         #endif
         for (j=0; j <= i; ++j)
            c(btest_find(root, items[j]) == NULL, "stb_bst 3");
         for (   ; j < 500; ++j)
            c(btest_find(root, items[j]) != NULL, "stb_bst 4");
         free(t);
      }
   }
}

extern void stu_uninit(void);

stb_define_sort(sort_int, int, *a < *b)

stb_rand_define(prime_rand, 1)
void test_packed_floats(void);
void test_parser_generator(void);

void rec_print(stb_dirtree2 *d, int depth)
{
   int i;
   for (i=0; i < depth; ++i) printf("  ");
   printf("%s (%d)\n", d->relpath, stb_arr_len(d->files));
   for (i=0; i < stb_arr_len(d->subdirs); ++i)
      rec_print(d->subdirs[i], depth+1);
   d->weight = (float) stb_arr_len(d->files);
}

#ifdef MAIN_TEST
int main(int argc, char **argv)
{
   char *z;
   stb__wchar buffer7[1024],buffer9[1024];
   char buffer8[4096];
   FILE *f;
   char *p1 = "foo/bar\\baz/test.xyz";
   char *p2 = "foo/.bar";
   char *p3 = "foo.bar";
   char *p4 = "foo/bar";
   char *wildcards[] = { "*foo*", "*bar", "baz", "*1*2*3*", "*/CVS/repository", "*oof*" };
   char **s;
   char buf[256], *p;
   int n,len2,*q,i;
   stb_matcher *mt=NULL;

   if (argc > 1) {
      do_compressor(argc,argv);
      return 0;
   }
   test_classes();
   //show();

   //stb_malloc_check_counter(2,2);
   //_CrtSetBreakAlloc(10398);

   stbprint("Checking {!if} the {$fancy} print function {#works}?  - should\n");
   stbprint("                                                      - align\n");
   stbprint("But {#3this}} {one}}                                  - shouldn't\n");

   #if 0
   {
      int i;
      char **s = stb_readdir_recursive("/sean", NULL);
      stb_dirtree *d = stb_dirtree_from_files_relative("", s, stb_arr_len(s));
      stb_dirtree **e;
      rec_print(d, 0);
      e = stb_summarize_tree(d,12,4);
      for (i=0; i < stb_arr_len(e); ++i) {
         printf("%s\n", e[i]->fullpath);
      }
      stb_arr_free(e);

      stb_fatal("foo");
   }
   #endif

   stb_("Started stb.c");
   test_threads2();
   test_threads();

   for (i=0; i < 1023 && 5+77*i < 0xd800; ++i)
      buffer7[i] = 5+77*i;
   buffer7[i++] = 0xd801;
   buffer7[i++] = 0xdc02;
   buffer7[i++] = 0xdbff;
   buffer7[i++] = 0xdfff;
   buffer7[i] = 0;
   p = stb_to_utf8(buffer8, buffer7, sizeof(buffer8));
   c(p != NULL, "stb_to_utf8");
   if (p != NULL) {
      stb_from_utf8(buffer9, buffer8, sizeof(buffer9)/2);
      c(!memcmp(buffer7, buffer9, i*2), "stb_from_utf8");
   }

   z = "foo.*[bd]ak?r";
   c( stb_regex(z, "muggle man food is barfy") == 1, "stb_regex 1");
   c( stb_regex("foo.*bar", "muggle man food is farfy") == 0, "stb_regex 2");
   c( stb_regex("[^a-zA-Z]foo[^a-zA-Z]", "dfoobar xfood") == 0, "stb_regex 3");
   c( stb_regex(z, "muman foob is bakrfy") == 1, "stb_regex 4");
   z = "foo.*[bd]bk?r";
   c( stb_regex(z, "muman foob is bakrfy") == 0, "stb_regex 5");
   c( stb_regex(z, "muman foob is bbkrfy") == 1, "stb_regex 6");

   stb_regex(NULL,NULL);

   #if 0
   test_parser_generator();
   stb_wrapper_listall(dumpfunc);
   if (alloc_num) 
      printf("Memory still in use: %d allocations of %d bytes.\n", alloc_num, alloc_size);
   #endif

   test_script();
   p = stb_file("sieve.stua", NULL);
   if (p) {
      stua_run_script(p);      
      free(p);
   }
   stua_uninit();

   //stb_wrapper_listall(dumpfunc);
   printf("Memory still in use: %d allocations of %d bytes.\n", alloc_num, alloc_size);

   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc 0");

   bst_test();

   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc 0");

#if 0
   // stb_block
   {
      int inuse=0, freespace=0;
      int *x = malloc(10000*sizeof(*x));
      stb_block *b = stb_block_new(1, 10000);
      #define BLOCK_COUNT  1000
      int *p = malloc(sizeof(*p) * BLOCK_COUNT);
      int *l = malloc(sizeof(*l) * BLOCK_COUNT);
      int i, n, k = 0;

      memset(x, 0, 10000 * sizeof(*x));

      n = 0;
      while (n < BLOCK_COUNT && k < 1000) {
         l[n] = 16 + (rand() & 31);
         p[n] = stb_block_alloc(b, l[n], 0);
         if (p[n] == 0)
            break;
         inuse += l[n];

         freespace = 0;
         for (i=0; i < b->len; ++i)
            freespace += b->freelist[i].len;
         assert(freespace + inuse == 9999);

         for (i=0; i < l[n]; ++i)
            x[ p[n]+i ] = p[n];
         ++n;

         if (k > 20) {
            int sz;
            i = (stb_rand() % n);
            sz = l[i];
            stb_block_free(b, p[i], sz);
            inuse -= sz;
            p[i] = p[n-1];
            l[i] = l[n-1];
            --n;

            freespace = 0;
            for (i=0; i < b->len; ++i)
               freespace += b->freelist[i].len;
            assert(freespace + inuse == 9999);
         }


         ++k;

         // validate
         if ((k % 50) == 0) {
            int j;
            for (j=0; j < n; ++j) {
               for (i=0; i < l[j]; ++i)
                  assert(x[ p[j]+i ] == p[j]);
            }
         }

         if ((k % 200) == 0) {
            stb_block_compact_freelist(b);
         }
      }

      for (i=0; i < n; ++i)
         stb_block_free(b, p[i], l[i]);

      stb_block_destroy(b);
      free(p);
      free(l);
      free(x);
   }

   blockfile_test();
#endif

   mt = stb_lex_matcher();
   for (i=0; i < 5; ++i)
      stb_lex_item_wild(mt, wildcards[i], i+1);

   c(1==stb_lex(mt, "this is a foo in the middle",NULL), "stb_matcher_match 1");
   c(0==stb_lex(mt, "this is a bar in the middle",NULL), "stb_matcher_match 2");
   c(0==stb_lex(mt, "this is a baz in the middle",NULL), "stb_matcher_match 3");
   c(2==stb_lex(mt, "this is a bar",NULL), "stb_matcher_match 4");
   c(0==stb_lex(mt, "this is a baz",NULL), "stb_matcher_match 5");
   c(3==stb_lex(mt, "baz",NULL), "stb_matcher_match 6");
   c(4==stb_lex(mt, "1_2_3_4",NULL), "stb_matcher_match 7");
   c(0==stb_lex(mt, "1  3  3 3 3  2 ",NULL), "stb_matcher_match 8");
   c(4==stb_lex(mt, "1  3  3 3 2  3 ",NULL), "stb_matcher_match 9");
   c(5==stb_lex(mt, "C:/sean/prj/old/gdmag/mipmap/hqp/adol-c/CVS/Repository",NULL), "stb_matcher_match 10");
   stb_matcher_free(mt);

   {
      #define SSIZE  500000
      static int arr[SSIZE],arr2[SSIZE];
      int i,good;
      for (i=0; i < SSIZE; ++i)
         arr2[i] = stb_rand();
      memcpy(arr,arr2,sizeof(arr));
      printf("stb_define_sort:\n");
      sort_int(arr, SSIZE);
      good = 1;
      for (i=0; i+1 < SSIZE; ++i)
         if (arr[i] > arr[i+1])
            good = 0;
      c(good, "stb_define_sort");
      printf("qsort:\n");
      qsort(arr2, SSIZE, sizeof(arr2[0]), stb_intcmp(0));
      printf("done\n");
      // check for bugs
      memset(arr, 0, sizeof(arr[0]) * 1000);
      sort_int(arr, 1000);
   }


   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc -2");

   c( stb_is_prime( 2), "stb_is_prime 1");
   c( stb_is_prime( 3), "stb_is_prime 2");
   c( stb_is_prime( 5), "stb_is_prime 3");
   c( stb_is_prime( 7), "stb_is_prime 4");
   c(!stb_is_prime( 9), "stb_is_prime 5");
   c( stb_is_prime(11), "stb_is_prime 6");
   c(!stb_is_prime(25), "stb_is_prime 7");
   c(!stb_is_prime(27), "stb_is_prime 8");
   c( stb_is_prime(29), "stb_is_prime 9");
   c( stb_is_prime(31), "stb_is_prime a");
   c(!stb_is_prime(33), "stb_is_prime b");
   c(!stb_is_prime(35), "stb_is_prime c");
   c(!stb_is_prime(36), "stb_is_prime d");

   for (n=7; n < 64; n += 3) {
      int i;
      stb_perfect s;
      unsigned int *p = malloc(n * sizeof(*p));
      for (i=0; i < n; ++i)
         p[i] = i*i;
      c(stb_perfect_create(&s, p, n), "stb_perfect_hash 1");
      stb_perfect_destroy(&s);
      for (i=0; i < n; ++i)
         p[i] = stb_rand();
      c(stb_perfect_create(&s, p, n), "stb_perfect_hash 2");
      stb_perfect_destroy(&s);
      for (i=0; i < n; ++i)
         p[i] = (0x80000000 >> stb_log2_ceil(n>>1)) * i;
      c(stb_perfect_create(&s, p, n), "stb_perfect_hash 2");
      stb_perfect_destroy(&s);
      for (i=0; i < n; ++i)
         p[i] = (int) malloc(1024);
      c(stb_perfect_create(&s, p, n), "stb_perfect_hash 3");
      stb_perfect_destroy(&s);
      for (i=0; i < n; ++i)
         free((void *) p[i]);
      free(p);
   }
   printf("Maximum attempts required to find perfect hash: %d\n",
         stb_perfect_hash_max_failures);

   p = "abcdefghijklmnopqrstuvwxyz";
   c(stb_ischar('c', p), "stb_ischar 1");
   c(stb_ischar('x', p), "stb_ischar 2");
   c(!stb_ischar('#', p), "stb_ischar 3");
   c(!stb_ischar('X', p), "stb_ischar 4");
   p = "0123456789";
   c(!stb_ischar('c', p), "stb_ischar 5");
   c(!stb_ischar('x', p), "stb_ischar 6");
   c(!stb_ischar('#', p), "stb_ischar 7");
   c(!stb_ischar('X', p), "stb_ischar 8");
   p = "#####";
   c(!stb_ischar('c', p), "stb_ischar a");
   c(!stb_ischar('x', p), "stb_ischar b");
   c(stb_ischar('#', p), "stb_ischar c");
   c(!stb_ischar('X', p), "stb_ischar d");
   p = "xXyY";
   c(!stb_ischar('c', p), "stb_ischar e");
   c(stb_ischar('x', p), "stb_ischar f");
   c(!stb_ischar('#', p), "stb_ischar g");
   c(stb_ischar('X', p), "stb_ischar h");

   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc 1");

   q = stb_wordwrapalloc(15, "How now brown cow. Testinglishously. Okey dokey");
   // How now brown
   // cow. Testinglis
   // hously. Okey
   // dokey
   c(stb_arr_len(q) ==  8, "stb_wordwrap 8");
   c(q[2] == 14 && q[3] == 15, "stb_wordwrap 9");
   c(q[4] == 29 && q[5] == 12, "stb_wordwrap 10");
   stb_arr_free(q);

   q = stb_wordwrapalloc(20, "How now brown cow. Testinglishously. Okey dokey");
   // How now brown cow.
   // Testinglishously.
   // Okey dokey
   c(stb_arr_len(q) ==  6, "stb_wordwrap 1");
   c(q[0] ==  0 && q[1] == 18, "stb_wordwrap 2");
   c(q[2] == 19 && q[3] == 17, "stb_wordwrap 3");
   c(q[4] == 37 && q[5] == 10, "stb_wordwrap 4");
   stb_arr_free(q);

   q = stb_wordwrapalloc(12, "How now brown cow. Testinglishously. Okey dokey");
   // How now
   // brown cow.
   // Testinglisho
   // usly. Okey
   // dokey
   c(stb_arr_len(q) ==  10, "stb_wordwrap 5");
   c(q[4] == 19 && q[5] == 12, "stb_wordwrap 6");
   c(q[6] == 31 && q[3] == 10, "stb_wordwrap 7");
   stb_arr_free(q);

   //test_script();

   //test_packed_floats();

   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc 0");
   if (stb_alloc_count_alloc != stb_alloc_count_free) {
      printf("%d allocs, %d frees\n", stb_alloc_count_alloc, stb_alloc_count_free);
   }
   test_lex();

   mt = stb_regex_matcher(".*foo.*bar.*");
   c(stb_matcher_match(mt, "foobarx")                == 1, "stb_matcher_match 1");
   c(stb_matcher_match(mt, "foobar")                 == 1, "stb_matcher_match 2");
   c(stb_matcher_match(mt, "foo bar")                == 1, "stb_matcher_match 3");
   c(stb_matcher_match(mt, "fo foo ba ba bar ba")    == 1, "stb_matcher_match 4");
   c(stb_matcher_match(mt, "fo oo oo ba ba bar foo") == 0, "stb_matcher_match 5");
   stb_free(mt);

   mt = stb_regex_matcher(".*foo.?bar.*");
   c(stb_matcher_match(mt, "abfoobarx")                == 1, "stb_matcher_match 6");
   c(stb_matcher_match(mt, "abfoobar")                 == 1, "stb_matcher_match 7");
   c(stb_matcher_match(mt, "abfoo bar")                == 1, "stb_matcher_match 8");
   c(stb_matcher_match(mt, "abfoo  bar")               == 0, "stb_matcher_match 9");
   c(stb_matcher_match(mt, "abfo foo ba ba bar ba")    == 0, "stb_matcher_match 10");
   c(stb_matcher_match(mt, "abfo oo oo ba ba bar foo") == 0, "stb_matcher_match 11");
   stb_free(mt);

   mt = stb_regex_matcher(".*m((foo|bar)*baz)m.*");
   c(stb_matcher_match(mt, "abfoobarx")                == 0, "stb_matcher_match 12");
   c(stb_matcher_match(mt, "a mfoofoofoobazm d")       == 1, "stb_matcher_match 13");
   c(stb_matcher_match(mt, "a mfoobarbazfoom d")       == 0, "stb_matcher_match 14");
   c(stb_matcher_match(mt, "a mbarbarfoobarbazm d")    == 1, "stb_matcher_match 15");
   c(stb_matcher_match(mt, "a mfoobarfoo bazm d")      == 0, "stb_matcher_match 16");
   c(stb_matcher_match(mt, "a mm foobarfoobarfoobar ") == 0, "stb_matcher_match 17");
   stb_free(mt);

   mt = stb_regex_matcher("f*|z");
   c(stb_matcher_match(mt, "fz")       == 0, "stb_matcher_match 0a");
   c(stb_matcher_match(mt, "ff")       == 1, "stb_matcher_match 0b");
   c(stb_matcher_match(mt, "z")        == 1, "stb_matcher_match 0c");
   stb_free(mt);

   mt = stb_regex_matcher("m(f|z*)n");
   c(stb_matcher_match(mt, "mfzn")     == 0, "stb_matcher_match 0d");
   c(stb_matcher_match(mt, "mffn")     == 0, "stb_matcher_match 0e");
   c(stb_matcher_match(mt, "mzn")      == 1, "stb_matcher_match 0f");
   c(stb_matcher_match(mt, "mn")       == 1, "stb_matcher_match 0g");
   c(stb_matcher_match(mt, "mzfn")     == 0, "stb_matcher_match 0f");

   c(stb_matcher_find(mt, "manmanmannnnnnnmmmmmmmmm       ") == 0, "stb_matcher_find 1");
   c(stb_matcher_find(mt, "manmanmannnnnnnmmmmmmmmm       ") == 0, "stb_matcher_find 2");
   c(stb_matcher_find(mt, "manmanmannnnnnnmmmmmmmmmffzzz  ") == 0, "stb_matcher_find 3");
   c(stb_matcher_find(mt, "manmanmannnnnnnmmmmmmmmmnfzzz  ") == 1, "stb_matcher_find 4");
   c(stb_matcher_find(mt, "mmmfn aanmannnnnnnmmmmmm fzzz  ") == 1, "stb_matcher_find 5");
   c(stb_matcher_find(mt, "mmmzzn anmannnnnnnmmmmmm fzzz  ") == 1, "stb_matcher_find 6");
   c(stb_matcher_find(mt, "mm anmannnnnnnmmmmmm fzmzznzz  ") == 1, "stb_matcher_find 7");
   c(stb_matcher_find(mt, "mm anmannnnnnnmmmmmm fzmzzfnzz ") == 0, "stb_matcher_find 8");
   c(stb_matcher_find(mt, "manmfnmannnnnnnmmmmmmmmmffzzz  ") == 1, "stb_matcher_find 9");
   stb_free(mt);

   mt = stb_regex_matcher(".*m((foo|bar)*|baz)m.*");
   c(stb_matcher_match(mt, "abfoobarx")                == 0, "stb_matcher_match 18");
   c(stb_matcher_match(mt, "a mfoofoofoobazm d")       == 0, "stb_matcher_match 19");
   c(stb_matcher_match(mt, "a mfoobarbazfoom d")       == 0, "stb_matcher_match 20");
   c(stb_matcher_match(mt, "a mbazm d")                == 1, "stb_matcher_match 21");
   c(stb_matcher_match(mt, "a mfoobarfoom d")          == 1, "stb_matcher_match 22");
   c(stb_matcher_match(mt, "a mm foobarfoobarfoobar ") == 1, "stb_matcher_match 23");
   stb_free(mt);

   mt = stb_regex_matcher("[a-fA-F]..[^]a-zA-Z]");
   c(stb_matcher_match(mt, "Axx1")                     == 1, "stb_matcher_match 24");
   c(stb_matcher_match(mt, "Fxx1")                     == 1, "stb_matcher_match 25");
   c(stb_matcher_match(mt, "Bxx]")                     == 0, "stb_matcher_match 26");
   c(stb_matcher_match(mt, "Cxxz")                     == 0, "stb_matcher_match 27");
   c(stb_matcher_match(mt, "gxx[")                     == 0, "stb_matcher_match 28");
   c(stb_matcher_match(mt, "-xx0")                     == 0, "stb_matcher_match 29");
   stb_free(mt);

   c(stb_wildmatch("foo*bar", "foobarx")    == 0, "stb_wildmatch 0a");
   c(stb_wildmatch("foo*bar", "foobar")     == 1, "stb_wildmatch 1a");
   c(stb_wildmatch("foo*bar", "foo bar")    == 1, "stb_wildmatch 2a");
   c(stb_wildmatch("foo*bar", "fo foo ba ba bar ba") == 0, "stb_wildmatch 3a");
   c(stb_wildmatch("foo*bar", "fo oo oo ba ba ar foo") == 0, "stb_wildmatch 4a");

   c(stb_wildmatch("*foo*bar*", "foobar")     == 1, "stb_wildmatch 1b");
   c(stb_wildmatch("*foo*bar*", "foo bar")    == 1, "stb_wildmatch 2b");
   c(stb_wildmatch("*foo*bar*", "fo foo ba ba bar ba") == 1, "stb_wildmatch 3b");
   c(stb_wildmatch("*foo*bar*", "fo oo oo ba ba ar foo") == 0, "stb_wildmatch 4b");

   c(stb_wildmatch("foo*bar*", "foobarx")     == 1, "stb_wildmatch 1c");
   c(stb_wildmatch("foo*bar*", "foobabar")    == 1, "stb_wildmatch 2c");
   c(stb_wildmatch("foo*bar*", "fo foo ba ba bar ba") == 0, "stb_wildmatch 3c");
   c(stb_wildmatch("foo*bar*", "fo oo oo ba ba ar foo") == 0, "stb_wildmatch 4c");

   c(stb_wildmatch("*foo*bar", "foobar")     == 1, "stb_wildmatch 1d");
   c(stb_wildmatch("*foo*bar", "foo bar")    == 1, "stb_wildmatch 2d");
   c(stb_wildmatch("*foo*bar", "fo foo ba ba bar ba") == 0, "stb_wildmatch 3d");
   c(stb_wildmatch("*foo*bar", "fo oo oo ba ba ar foo") == 0, "stb_wildmatch 4d");

   c(stb_wildfind("foo*bar", "xyfoobarx")    == 2, "stb_wildfind 0a");
   c(stb_wildfind("foo*bar", "aaafoobar")    == 3, "stb_wildfind 1a");
   c(stb_wildfind("foo*bar", "foo bar")      == 0, "stb_wildfind 2a");
   c(stb_wildfind("foo*bar", "fo foo ba ba bar ba") == 3, "stb_wildfind 3a");
   c(stb_wildfind("foo*bar", "fo oo oo ba ba ar foo") == -1, "stb_wildfind 4a");

   c(stb_wildmatch("*foo*;*bar*", "foobar")  == 1, "stb_wildmatch 1e");
   c(stb_wildmatch("*foo*;*bar*", "afooa")  == 1, "stb_wildmatch 2e");
   c(stb_wildmatch("*foo*;*bar*", "abara")  == 1, "stb_wildmatch 3e");
   c(stb_wildmatch("*foo*;*bar*", "abaza")  == 0, "stb_wildmatch 4e");
   c(stb_wildmatch("*foo*;*bar*", "foboar")  == 0, "stb_wildmatch 5e");

   test_sha1();

   n = sizeof(args_raw)/sizeof(args_raw[0]);
   memcpy(args, args_raw, sizeof(args_raw));
   s = stb_getopt(&n, args);
   c(n >= 1 && !strcmp(args[1], "bar" ), "stb_getopt 1");
   c(stb_arr_len(s) >= 2 && !strcmp(s[2]   , "r"   ), "stb_getopt 2");
   stb_getopt_free(s);

   n = sizeof(args_raw)/sizeof(args_raw[0]);
   memcpy(args, args_raw, sizeof(args_raw));
   s = stb_getopt_param(&n, args, "f");
   c(stb_arr_len(s) >= 3 && !strcmp(s[3]   , "fbar"), "stb_getopt 3");
   stb_getopt_free(s);

   n = sizeof(args_raw)/sizeof(args_raw[0]);
   memcpy(args, args_raw, sizeof(args_raw));
   s = stb_getopt_param(&n, args, "x");
   c(stb_arr_len(s) >= 2 && !strcmp(s[1]   , "xrf" ), "stb_getopt 4");
   stb_getopt_free(s);

   n = sizeof(args_raw)/sizeof(args_raw[0]);
   memcpy(args, args_raw, sizeof(args_raw));
   s = stb_getopt_param(&n, args, "s");
   c(s == NULL && n == 0     , "stb_getopt 5");
   stb_getopt_free(s);

#if 0
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3, -1, -1) ==  1, "stb_csample_int 1");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3,  1, -3) ==  2, "stb_csample_int 2");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3, 12, -2) ==  5, "stb_csample_int 3");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3, 15,  1) == 10, "stb_csample_int 4");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3,  5,  4) == 15, "stb_csample_int 5");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3,  3,  3) == 14, "stb_csample_int 6");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3, -2,  5) == 11, "stb_csample_int 7");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3, -7,  0) ==  1, "stb_csample_int 8");
   c(*stb_csample_int(sample_test[0], 1, 5, 5, 3,  2,  1) ==  8, "stb_csample_int 9");
#endif

   c(!strcmp(stb_splitpath(buf, p1, STB_PATH      ), "foo/bar\\baz/"), "stb_splitpath 1");
   c(!strcmp(stb_splitpath(buf, p1, STB_FILE      ), "test"), "stb_splitpath 2");
   c(!strcmp(stb_splitpath(buf, p1, STB_EXT       ), ".xyz"), "stb_splitpath 3");
   c(!strcmp(stb_splitpath(buf, p1, STB_PATH_FILE ), "foo/bar\\baz/test"), "stb_splitpath 4");
   c(!strcmp(stb_splitpath(buf, p1, STB_FILE_EXT  ), "test.xyz"), "stb_splitpath 5");

   c(!strcmp(stb_splitpath(buf, p2, STB_PATH      ), "foo/"), "stb_splitpath 6");
   c(!strcmp(stb_splitpath(buf, p2, STB_FILE      ), ""), "stb_splitpath 7");
   c(!strcmp(stb_splitpath(buf, p2, STB_EXT       ), ".bar"), "stb_splitpath 8");
   c(!strcmp(stb_splitpath(buf, p2, STB_PATH_FILE ), "foo/"), "stb_splitpath 9");
   c(!strcmp(stb_splitpath(buf, p2, STB_FILE_EXT  ), ".bar"), "stb_splitpath 10");

   c(!strcmp(stb_splitpath(buf, p3, STB_PATH      ), "./"), "stb_splitpath 11");
   c(!strcmp(stb_splitpath(buf, p3, STB_FILE      ), "foo"), "stb_splitpath 12");
   c(!strcmp(stb_splitpath(buf, p3, STB_EXT       ), ".bar"), "stb_splitpath 13");
   c(!strcmp(stb_splitpath(buf, p3, STB_PATH_FILE ), "foo"), "stb_splitpath 14");

   c(!strcmp(stb_splitpath(buf, p4, STB_PATH      ), "foo/"), "stb_splitpath 16");
   c(!strcmp(stb_splitpath(buf, p4, STB_FILE      ), "bar"), "stb_splitpath 17");
   c(!strcmp(stb_splitpath(buf, p4, STB_EXT       ), ""), "stb_splitpath 18");
   c(!strcmp(stb_splitpath(buf, p4, STB_PATH_FILE ), "foo/bar"), "stb_splitpath 19");
   c(!strcmp(stb_splitpath(buf, p4, STB_FILE_EXT  ), "bar"), "stb_splitpath 20");

   c(!strcmp(p=stb_dupreplace("testfootffooo foo fox", "foo", "brap"), "testbraptfbrapo brap fox"), "stb_dupreplace 1"); free(p);
   c(!strcmp(p=stb_dupreplace("testfootffooo foo fox", "foo", ""    ), "testtfo  fox"            ), "stb_dupreplace 2"); free(p);
   c(!strcmp(p=stb_dupreplace("abacab", "a", "aba"),                   "abababacabab"            ), "stb_dupreplace 3"); free(p);


#if 0
   m = stb_mml_parse("<a><b><c>x</c><d>y</d></b><e>&lt;&amp;f&gt;</e></a>");
   c(m != NULL, "stb_mml_parse 1");
   if (m) {
      c(!strcmp(m->child[0]->child[0]->child[1]->tag, "d"), "stb_mml_parse 2");
      c(!strcmp(m->child[0]->child[1]->leaf_data, "<&f>"), "stb_mml_parse 3");
   }
   if (m)
      stb_mml_free(m);
   c(stb_alloc_count_alloc == stb_alloc_count_free, "stb_alloc 1");
   if (stb_alloc_count_alloc != stb_alloc_count_free) {
      printf("%d allocs, %d frees\n", stb_alloc_count_alloc, stb_alloc_count_free);
   }
#endif

   c(stb_linear_remap(3.0f,0,8,1,2) == 1.375, "stb_linear_remap()");

   c(stb_bitreverse(0x1248fec8) == 0x137f1248, "stb_bitreverse() 1");
   c(stb_bitreverse8(0x4e) == 0x72, "stb_bitreverse8() 1");
   c(stb_bitreverse8(0x31) == 0x8c, "stb_bitreverse8() 2");
   for (n=1; n < 255; ++n) {
      unsigned int m = stb_bitreverse8((uint8) n);
      c(stb_bitreverse8((uint8) m) == (unsigned int) n, "stb_bitreverse8() 3");
   }

   for (n=2; n <= 31; ++n) {
      c(stb_is_pow2   ((1 << n)  ) == 1  , "stb_is_pow2() 1");
      c(stb_is_pow2   ((1 << n)+1) == 0  , "stb_is_pow2() 2");
      c(stb_is_pow2   ((1 << n)-1) == 0  , "stb_is_pow2() 3");

      c(stb_log2_floor((1 << n)  ) == n  , "stb_log2_floor() 1");
      c(stb_log2_floor((1 << n)+1) == n  , "stb_log2_floor() 2");
      c(stb_log2_floor((1 << n)-1) == n-1, "stb_log2_floor() 3");

      c(stb_log2_ceil ((1 << n)  ) == n  , "stb_log2_ceil() 1");
      c(stb_log2_ceil ((1 << n)+1) == n+1, "stb_log2_ceil() 2");
      c(stb_log2_ceil ((1 << n)-1) == n  , "stb_log2_ceil() 3");

      c(stb_bitreverse(1 << n) == 1U << (31-n), "stb_bitreverse() 2");
   }

   c(stb_log2_floor(0) == -1, "stb_log2_floor() 4");
   c(stb_log2_ceil (0) == -1, "stb_log2_ceil () 4");

   c(stb_log2_floor(-1) == 31, "stb_log2_floor() 5");
   c(stb_log2_ceil (-1) == 32, "stb_log2_ceil () 5");

   c(stb_bitcount(0xffffffff) == 32, "stb_bitcount() 1");
   c(stb_bitcount(0xaaaaaaaa) == 16, "stb_bitcount() 2");
   c(stb_bitcount(0x55555555) == 16, "stb_bitcount() 3");
   c(stb_bitcount(0x00000000) ==  0, "stb_bitcount() 4");

   c(stb_lowbit8(0xf0) == 4, "stb_lowbit8 1");
   c(stb_lowbit8(0x10) == 4, "stb_lowbit8 2");
   c(stb_lowbit8(0xf3) == 0, "stb_lowbit8 3");
   c(stb_lowbit8(0xf8) == 3, "stb_lowbit8 4");
   c(stb_lowbit8(0x60) == 5, "stb_lowbit8 5");

   for (n=0; n < sizeof(buf); ++n)
      buf[n] = 0;

   for (n = 0; n < 200000; ++n) {
      unsigned int k = stb_rand();
      int i,z=0;
      for (i=0; i < 32; ++i)
         if (k & (1 << i)) ++z;
      c(stb_bitcount(k) == z, "stb_bitcount() 5");

      buf[k >> 24] = 1;

      if (k != 0) {
         if (stb_is_pow2(k)) {
            c(stb_log2_floor(k) == stb_log2_ceil(k), "stb_is_pow2() 1");
            c(k == 1U << stb_log2_floor(k), "stb_is_pow2() 2");
         } else {
            c(stb_log2_floor(k) == stb_log2_ceil(k)-1, "stb_is_pow2() 3");
         }
      }

      c(stb_bitreverse(stb_bitreverse(n)) == (uint32) n, "stb_bitreverse() 3");
   }

   // make sure reasonable coverage from stb_rand()
   for (n=0; n < sizeof(buf); ++n)
      c(buf[n] != 0, "stb_rand()");

   for (n=0; n < sizeof(buf); ++n)
      buf[n] = 0;

   for (n=0; n < 60000; ++n) {
      float z = (float) stb_frand();
      int n = (int) (z * sizeof(buf));
      c(z >= 0 && z < 1, "stb_frand() 1");
      c(n >= 0 && n < sizeof(buf), "stb_frand() 2");
      buf[n] = 1;
   }

   // make sure reasonable coverage from stb_frand(),
   // e.g. that the range remap isn't incorrect
   for (n=0; n < sizeof(buf); ++n)
      c(buf[n] != 0, "stb_frand()");
         

   // stb_arr
   {
      short *s = NULL;

      c(sum(s) == 0, "stb_arr 1");

      stb_arr_add(s); s[0] = 3;
      stb_arr_push(s,7);

      c( stb_arr_valid(s,1), "stb_arr 2");
      c(!stb_arr_valid(s,2), "stb_arr 3");

      // force a realloc
      stb_arr_push(s,0);
      stb_arr_push(s,0);
      stb_arr_push(s,0);
      stb_arr_push(s,0);

      c(sum(s) == 10, "stb_arr 4");
      stb_arr_push(s,0);
      s[0] = 1; s[1] = 5; s[2] = 20;
      c(sum(s) == 26, "stb_arr 5");
      stb_arr_setlen(s,2);
      c(sum(s) == 6, "stb_arr 6");
      stb_arr_setlen(s,1);
      c(sum(s) == 1, "stb_arr 7");
      stb_arr_setlen(s,0);
      c(sum(s) == 0, "stb_arr 8");

      stb_arr_push(s,3);
      stb_arr_push(s,4);
      stb_arr_push(s,5);
      stb_arr_push(s,6);
      stb_arr_push(s,7);
      stb_arr_deleten(s,1,3);
      c(stb_arr_len(s)==2 && sum(s) == 10, "stb_arr_9");

      stb_arr_push(s,2);
      // 3 7 2
      stb_arr_insertn(s,2,2);
      // 3 7 x x 2
      s[2] = 5;
      s[3] = 6;
      c(s[0]==3 && s[1] == 7 && s[2] == 5 && s[3] == 6 && s[4] == 2, "stb_arr 10");
      stb_arr_free(s);
   }

   #if 1
   f= stb_fopen("data/stb.test", "wb");
   fwrite(buffer, 1, sizeof(buffer)-1, f);
   stb_fclose(f, stb_keep_yes);
   #ifndef WIN32
   sleep(1);  // andLinux has some synchronization problem here
   #endif
   #else
   f= fopen("data/stb.test", "wb");
   fwrite(buffer, 1, sizeof(buffer)-1, f);
   fclose(f);
   #endif
   if (!stb_fexists("data/stb.test")) {
      fprintf(stderr, "Error: couldn't open file just written, or stb_fexists() is broken.\n");
   }

   f = fopen("data/stb.test", "rb");
   // f = NULL; // test stb_fatal()
   if (!f) { stb_fatal("Error: couldn't open file just written\n"); }
   else {
      char temp[4];
      int len1 = stb_filelen(f), len2;
      int n1,n2;
      if (fread(temp,1,4,f) == 0) {
         int n = ferror(f);
         if (n) { stb_fatal("Error reading from stream: %d", n); }
         if (feof(f)) stb_fatal("Weird, read 0 bytes and hit eof");
         stb_fatal("Read 0, but neither feof nor ferror is true");
      }
      fclose(f);
      p = stb_file("data/stb.test", &len2);
      if (p == NULL) stb_fatal("Error: stb_file() failed");
      c(len1 == sizeof(buffer)-1, "stb_filelen()");
      c(len2 == sizeof(buffer)-1, "stb_file():n");
      c(memcmp(p, buffer, sizeof(buffer)-1) == 0, "stb_file()");
      c(strcmp(p, buffer)==0, "stb_file() terminated");
      free(p);

      s = stb_stringfile("data/stb.test", &n1);
      c(n1 == 3, "stb_stringfile():n");
      n2 = 0;
      while (s[n2]) ++n2;
      c(n1 == n2, "stb_stringfile():n length matches the non-NULL strings");
      if (n2 == 3) {
         c(strcmp(s[0],str1)==0, "stb_stringfile()[0]");
         c(strcmp(s[1],str2)==0, "stb_stringfile()[1]");
         c(strcmp(s[2],str3)==0, "stb_stringfile()[2] (no terminating newlines)");
      }
      free(s);

      f = fopen("data/stb.test", "rb");
      stb_fgets(buf, sizeof(buf), f);
      //c(strcmp(buf, str1)==0, "stb_fgets()");
      p = stb_fgets_malloc(f);
      n1 = strlen(p);
      n2 = strlen(str2);
      c(strcmp(p, str2)==0, "stb_fgets_malloc()");
      free(p);
      stb_fgets(buf, sizeof(buf), f);
      c(strcmp(buf, str3)==0, "stb_fgets()3");
   }

   c( stb_prefix("foobar", "foo"), "stb_prefix() 1");
   c(!stb_prefix("foo", "foobar"), "stb_prefix() 2");
   c( stb_prefix("foob", "foob" ), "stb_prefix() 3");

   stb_strncpy(buf, "foobar", 6);  c(strcmp(buf,"fooba" )==0, "stb_strncpy() 1");
   stb_strncpy(buf, "foobar", 8);  c(strcmp(buf,"foobar")==0, "stb_strncpy() 2");

   c(!strcmp(p=stb_duplower("FooBar"), "foobar"), "stb_duplower()"); free(p);
   strcpy(buf, "FooBar");
   stb_tolower(buf);
   c(!strcmp(buf, "foobar"), "stb_tolower()");

   p = stb_strtok(buf, "foo=ba*r", "#=*");
   c(!strcmp(buf, "foo" ), "stb_strtok() 1");
   c(!strcmp(p  , "ba*r"), "stb_strtok() 2");
   p = stb_strtok(buf, "foobar", "#=*");
   c(*p == 0, "stb_strtok() 3");

   c(!strcmp(stb_skipwhite(" \t\n foo"), "foo"), "stb_skipwhite()");

   s = stb_tokens("foo == ba*r", "#=*", NULL);
   c(!strcmp(s[0], "foo "), "stb_tokens() 1");
   c(!strcmp(s[1], " ba"),  "stb_tokens() 2");
   c(!strcmp(s[2], "r"),    "stb_tokens() 3");
   c(s[3] == 0,             "stb_tokens() 4");
   free(s);

   s = stb_tokens_allowempty("foo == ba*r", "#=*", NULL);
   c(!strcmp(s[0], "foo "), "stb_tokens_allowempty() 1");
   c(!strcmp(s[1], ""    ), "stb_tokens_allowempty() 2");
   c(!strcmp(s[2], " ba"),  "stb_tokens_allowempty() 3");
   c(!strcmp(s[3], "r"),    "stb_tokens_allowempty() 4");
   c(s[4] == 0,             "stb_tokens_allowempty() 5");
   free(s);

   s = stb_tokens_stripwhite("foo == ba*r", "#=*", NULL);
   c(!strcmp(s[0], "foo"),  "stb_tokens_stripwhite() 1");
   c(!strcmp(s[1], ""   ),  "stb_tokens_stripwhite() 2");
   c(!strcmp(s[2], "ba"),   "stb_tokens_stripwhite() 3");
   c(!strcmp(s[3], "r"),    "stb_tokens_stripwhite() 4");
   c(s[4] == 0,             "stb_tokens_stripwhite() 5");
   free(s);

   s = stb_tokens_quoted("foo =\"=\" ba*\"\"r \" foo\" bah    ", "#=*", NULL);
   c(!strcmp(s[0], "foo"),  "stb_tokens_quoted() 1");
   c(!strcmp(s[1], "= ba"), "stb_tokens_quoted() 2");
   c(!strcmp(s[2], "\"r  foo bah"),  "stb_tokens_quoted() 3");
   c(s[3] == 0,             "stb_tokens_quoted() 4");
   free(s);


   p = stb_file("stb.h", &len2);
   if (p) {
      uint32 z = stb_adler32_old(1, p, len2);
      uint32 x = stb_adler32    (1, p, len2);
      c(z == x, "stb_adler32() 1");
      memset(p,0xff,len2);
      z = stb_adler32_old((65520<<16) + 65520, p, len2);
      x = stb_adler32    ((65520<<16) + 65520, p, len2);
      c(z == x, "stb_adler32() 2");
      free(p);
   }

   //   stb_hheap
   {
      #define HHEAP_COUNT  100000
      void **p = malloc(sizeof(*p) * HHEAP_COUNT);
      int i, j;
      #if 0
      stb_hheap *h2, *h = stb_newhheap(sizeof(struct1),0);

      for (i=0; i < HHEAP_COUNT; ++i)
         p[i] = stb_halloc(h);
      stb_shuffle(p, HHEAP_COUNT, sizeof(*p), stb_rand());
      for (i=0; i < HHEAP_COUNT; ++i)
         stb_hfree(p[i]);

      c(h->num_alloc == 0, "stb_hheap 1");
      stb_delhheap(h);

      h = stb_newhheap(sizeof(struct1),0);
      h2 = stb_newhheap(sizeof(struct2),8);

      for (i=0; i < HHEAP_COUNT; ++i) {
         if (i & 1)
            p[i] = stb_halloc(h);
         else {
            p[i] = stb_halloc(h2);
            c((((int) p[i]) & 4) == 0, "stb_hheap 2");
         }
      }

      stb_shuffle(p, HHEAP_COUNT, sizeof(*p), stb_rand());
      for (i=0; i < HHEAP_COUNT; ++i)
         stb_hfree(p[i]);

      c(h->num_alloc == 0, "stb_hheap 3");
      c(h2->num_alloc == 0, "stb_hheap 4");

      stb_delhheap(h);
      stb_delhheap(h2);
      #else
      for (i=0; i < HHEAP_COUNT; ++i)
         p[i] = malloc(32);
      stb_shuffle(p, HHEAP_COUNT, sizeof(*p), stb_rand());
      for (i=0; i < HHEAP_COUNT; ++i)
         free(p[i]);
      #endif

      // now use the same array of pointers to do pointer set operations
      for (j=100; j < HHEAP_COUNT; j += 25000) {
         stb_ps *ps = NULL;
         for (i=0; i < j; ++i)
            ps = stb_ps_add(ps, p[i]);

         for (i=0; i < HHEAP_COUNT; ++i)
            c(stb_ps_find(ps, p[i]) == (i < j), "stb_ps 1");
         c(stb_ps_count(ps) == j, "stb_ps 1b");

         for (i=j; i < HHEAP_COUNT; ++i)
            ps = stb_ps_add(ps, p[i]);

         for (i=0; i < j; ++i)
            ps = stb_ps_remove(ps, p[i]);

         for (i=0; i < HHEAP_COUNT; ++i)
            c(stb_ps_find(ps, p[i]) == !(i < j), "stb_ps 2");

         stb_ps_delete(ps);
      }

      #define HHEAP_COUNT2   100
      // now use the same array of pointers to do pointer set operations
      for (j=1; j < 40; ++j) {
         stb_ps *ps = NULL;
         for (i=0; i < j; ++i)
            ps = stb_ps_add(ps, p[i]);

         for (i=0; i < HHEAP_COUNT2; ++i)
            c(stb_ps_find(ps, p[i]) == (i < j), "stb_ps 3");
         c(stb_ps_count(ps) == j, "stb_ps 3b");

         for (i=j; i < HHEAP_COUNT2; ++i)
            ps = stb_ps_add(ps, p[i]);

         for (i=0; i < j; ++i)
            ps = stb_ps_remove(ps, p[i]);

         for (i=0; i < HHEAP_COUNT2; ++i)
            c(stb_ps_find(ps, p[i]) == !(i < j), "stb_ps 4");

         stb_ps_delete(ps);
      }

      free(p);
   }


   n = test_compression(tc, sizeof(tc));
   c(n >= 0, "stb_compress()/stb_decompress() 1");

   p = stb_file("stb.h", &len2);
   if (p) {
      FILE *f = fopen("data/stb_h.z", "wb");
      if (stb_compress_stream_start(f)) {
         int i;
         void *q;
         int len3;

         for (i=0; i < len2; ) {
            int n = stb_rand() % 10;
            if (n <= 6) n = 1 + stb_rand()%16;
            else if (n <= 8) n = 20 + stb_rand() % 1000;
            else n = 15000;
            if (i + n > len2) n = len2 - i;
            stb_write(p + i, n);
            i += n;
         }
         stb_compress_stream_end(1);

         q = stb_decompress_fromfile("data/stb_h.z", &len3);
         c(len3 == len2, "stb_compress_stream 2");
         if (len2 == len3)
            c(!memcmp(p,q,len2), "stb_compress_stream 3");
         if (q) free(q);
      } else {
         c(0, "stb_compress_stream 1");
      }

      free(p);
      stb_compress_window(65536*4);
   }

   p = stb_file("stb.h", &len2);
   if (p) {
      n = test_compression(p, len2);
      c(n >= 0, "stb_compress()/stb_decompress() 2");
      #if 0
      n = test_en_compression(p, len2);
      c(n >= 0, "stb_en_compress()/stb_en_decompress() 2");
      #endif
      free(p);
   } else {
      fprintf(stderr, "No stb.h to compression test.\n");
   }

   p = stb_file("data/test.bmp", &len2);
   if (p) {
      n = test_compression(p, len2);
      c(n == 106141, "stb_compress()/stb_decompress() 4");
      #if 0
      n = test_en_compression(p, len2);
      c(n >= 0, "stb_en_compress()/stb_en_decompress() 4");
      #endif
      free(p);
   }

   // the hardcoded compressed lengths being verified _could_
   // change if you changed the compressor parameters; but pure
   // performance optimizations shouldn't change them
   p = stb_file("data/cantrbry.zip", &len2);
   if (p) {
      n = test_compression(p, len2);
      c(n == 642787, "stb_compress()/stb_decompress() 3");
      #if 0
      n = test_en_compression(p, len2);
      c(n >= 0, "stb_en_compress()/stb_en_decompress() 3");
      #endif
      free(p);
   }

   p = stb_file("data/bible.txt", &len2);
   if (p) {
      n = test_compression(p, len2);
      c(n == 2022520, "stb_compress()/stb_decompress() 4");
      #if 0
      n = test_en_compression(p, len2);
      c(n >= 0, "stb_en_compress()/stb_en_decompress() 4");
      #endif
      free(p);
   }

   {
      int len = 1 << 25, o=0; // 32MB
      char *buffer = malloc(len);
      int i;
      for (i=0; i < 8192; ++i)
         buffer[o++] = (char) stb_rand();
      for (i=0; i < (1 << 15); ++i)
         buffer[o++] = 1;
      for (i=0; i < 64; ++i)
         buffer[o++] = buffer[i];
      for (i=0; i < (1 << 21); ++i)
         buffer[o++] = 2;
      for (i=0; i < 64; ++i)
         buffer[o++] = buffer[i];
      for (i=0; i < (1 << 21); ++i)
         buffer[o++] = 3;
      for (i=0; i < 8192; ++i)
         buffer[o++] = buffer[i];
      for (i=0; i < (1 << 21); ++i)
         buffer[o++] = 4;
      assert(o < len);
      stb_compress_window(1 << 24);
      i = test_compression(buffer, len);
      c(n >= 0, "stb_compress() 6");
      free(buffer);
   }

   #ifdef STB_THREADS
   stb_thread_cleanup();
   #endif
   stb_ischar(0,NULL);
   stb_wrapper_listall(dumpfunc);
   printf("Memory still in use: %d allocations of %d bytes.\n", alloc_num, alloc_size);

   // force some memory checking
   for (n=1; n < 20; ++n)
      malloc(1 << n);

   printf("Finished stb.c with %d errors.\n", count);

   #ifdef _MSC_VER
   if (count)
      __asm int 3;
   #endif

   return 0;
}

#endif





// NIST test vectors

struct
{
   int length;
   char *message;
   char *digest;
} sha1_tests[] =
{
   24,
"616263",
"a9993e364706816aba3e25717850c26c9cd0d89d",

   1304,
"ec29561244ede706b6eb30a1c371d74450a105c3f9735f7fa9fe38cf67f304a5736a106e"
"92e17139a6813b1c81a4f3d3fb9546ab4296fa9f722826c066869edacd73b25480351858"
"13e22634a9da44000d95a281ff9f264ecce0a931222162d021cca28db5f3c2aa24945ab1"
"e31cb413ae29810fd794cad5dfaf29ec43cb38d198fe4ae1da2359780221405bd6712a53"
"05da4b1b737fce7cd21c0eb7728d08235a9011",
"970111c4e77bcc88cc20459c02b69b4aa8f58217",

   2096,
"5fc2c3f6a7e79dc94be526e5166a238899d54927ce470018fbfd668fd9dd97cbf64e2c91"
"584d01da63be3cc9fdff8adfefc3ac728e1e335b9cdc87f069172e323d094b47fa1e652a"
"fe4d6aa147a9f46fda33cacb65f3aa12234746b9007a8c85fe982afed7815221e43dba55"
"3d8fe8a022cdac1b99eeeea359e5a9d2e72e382dffa6d19f359f4f27dc3434cd27daeeda"
"8e38594873398678065fbb23665aba9309d946135da0e4a4afdadff14db18e85e71dd93c"
"3bf9faf7f25c8194c4269b1ee3d9934097ab990025d9c3aaf63d5109f52335dd3959d38a"
"e485050e4bbb6235574fc0102be8f7a306d6e8de6ba6becf80f37415b57f9898a5824e77"
"414197422be3d36a6080",
   "0423dc76a8791107d14e13f5265b343f24cc0f19",

   2888,
"0f865f46a8f3aed2da18482aa09a8f390dc9da07d51d1bd10fe0bf5f3928d5927d08733d"
"32075535a6d1c8ac1b2dc6ba0f2f633dc1af68e3f0fa3d85e6c60cb7b56c239dc1519a00"
"7ea536a07b518ecca02a6c31b46b76f021620ef3fc6976804018380e5ab9c558ebfc5cb1"
"c9ed2d974722bf8ab6398f1f2b82fa5083f85c16a5767a3a07271d67743f00850ce8ec42"
"8c7f22f1cf01f99895c0c844845b06a06cecb0c6cf83eb55a1d4ebc44c2c13f6f7aa5e0e"
"08abfd84e7864279057abc471ee4a45dbbb5774afa24e51791a0eada11093b88681fe30b"
"aa3b2e94113dc63342c51ca5d1a6096d0897b626e42cb91761058008f746f35465465540"
"ad8c6b8b60f7e1461b3ce9e6529625984cb8c7d46f07f735be067588a0117f23e34ff578"
"00e2bbe9a1605fde6087fb15d22c5d3ac47566b8c448b0cee40373e5ba6eaa21abee7136"
"6afbb27dbbd300477d70c371e7b8963812f5ed4fb784fb2f3bd1d3afe883cdd47ef32bea"
"ea",
   "6692a71d73e00f27df976bc56df4970650d90e45",

   3680,
"4893f1c763625f2c6ce53aacf28026f14b3cd8687e1a1d3b60a81e80fcd1e2b038f9145a"
"b64a0718f948f7c3c9ac92e3d86fb669a5257da1a18c776291653688338210a3242120f1"
"01788e8acc9110db9258b1554bf3d26602516ea93606a25a7f566c0c758fb39ecd9d876b"
"c5d8abc1c3205095382c2474cb1f8bbdb45c2c0e659cb0fc703ec607a5de6bcc7a28687d"
"b1ee1c8f34797bb2441d5706d210df8c2d7d65dbded36414d063c117b52a51f7a4eb9cac"
"0782e008b47459ed5acac0bc1f20121087f992ad985511b33c866d18e63f585478ee5a5e"
"654b19d81231d98683ae3f0533565aba43dce408d7e3c4c6be11d8f05165f29c9dcb2030"
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"aff4730072401aaeb8b713ead4394e2e64b6917d6eee2549af7bd0952f12035719065320"
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"b7b916c5930ab66b4d191103cefc74f2f7e0e96e354f65e355ae43959a0af1880d14ea9d"
"1569e4fd47174aba7f5decb430b3f6baf80a1ef27855227b62487250d3602970e423423c"
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   "8b6d59106f04300cb57c7c961945cd77f3536b0a",

   13976,
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   14768,
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"8f2053f29b81e277be46",
   "a757ead499a6ec3d8ab9814f839117354ae563c8"
};

void test_sha1(void)
{
   unsigned char buffer[4000];
   int i;
   for (i=0; i < sizeof(sha1_tests) / sizeof(sha1_tests[0]); ++i) {
      stb_uint len = sha1_tests[i].length / 8;
      unsigned char digest[20], fdig[20];
      unsigned int h;
      assert(len <= sizeof(buffer));
      assert(strlen(sha1_tests[i].message) == len*2);
      assert(strlen(sha1_tests[i].digest) == 20 * 2);
      for (h=0; h < len; ++h) {
         char v[3];
         v[0] = sha1_tests[i].message[h*2];
         v[1] = sha1_tests[i].message[h*2+1];
         v[2] = 0;
         buffer[h] = (unsigned char) strtol(v, NULL, 16);
      }
      stb_sha1(digest, buffer, len);
      for (h=0; h < 20; ++h) {
         char v[3];
         int res;
         v[0] = sha1_tests[i].digest[h*2];
         v[1] = sha1_tests[i].digest[h*2+1];
         v[2] = 0;
         res = digest[h] == strtol(v, NULL, 16);
         c(res, sha1_tests[i].digest);
         if (!res)
            break;
      }
      {
         int z;
         FILE *f = fopen("data/test.bin", "wb");
         if (!f) stb_fatal("Couldn't write to test.bin");
         fwrite(buffer, len, 1, f);
         fclose(f);
         #ifdef _WIN32
         z = stb_sha1_file(fdig, "data/test.bin");
         if (!z) stb_fatal("Couldn't digest test.bin");
         c(memcmp(digest, fdig, 20)==0, "stb_sh1_file");
         #endif
      }
   }
}


#if 0

stb__obj zero, one;

void test_packed_floats(void)
{
   stb__obj *p;
   float x,y,*q;
   clock_t a,b,c;
   int i;
   stb_float_init();
   for (i=-10; i < 10; ++i) {
      float f = (float) pow(10,i);
      float g = f * 10;
      float delta = (g - f) / 10000;
      while (f < g) {
         stb__obj z = stb_float(f);
         float k = stb_getfloat(z);
         float p = stb_getfloat_table(z);
         assert((z & 1) == 1);
         assert(f == k);
         assert(k == p);
         f += delta;
      }
   }

   zero = stb_float(0);
   one  = stb_float(1);

   p = malloc(8192 * 4);
   for (i=0; i < 8192; ++i)
      p[i] = stb_rand();
   for (i=0; i < 8192; ++i)
      if ((stb_rand() & 31) < 28)
         p[i] = zero;

   q = malloc(4 * 1024);
      
   a = clock();

   x = y = 0;
   for (i=0; i < 200000000; ++i)
      q[i&1023] = stb_getfloat_table(p[i&8191]);
   b = clock();
   for (i=0; i < 200000000; ++i)
      q[i&1023] = stb_getfloat_table2(p[i&8191]);
   c = clock();
   free(p);

   free(q);

   printf("Table: %d\nIFs: %d\n", b-a, c-b);
}
#endif


void do_compressor(int argc,char**argv)
{
   char *p;
   size_t slen;
   int len;

   int window;
   if (argc == 2) {
      p = stb_file(argv[1], &slen);
      len = (int) slen;
      if (p) {
         int dlen, clen = stb_compress_tofile("data/dummy.bin", p, len);
         char *q = stb_decompress_fromfile("data/dummy.bin", &dlen);

         if (len != dlen) {
            printf("FAILED %d -> %d\n", len, clen);
         } else {
            int z = memcmp(q,p,dlen);
            if (z != 0) 
               printf("FAILED %d -> %d\n", len, clen);
            else
               printf("%d -> %d\n", len, clen);
         }
      }
      return;
   }

   window = atoi(argv[1]);
   if (window && argc == 4) {
      p = stb_file(argv[3], &slen);
      len = (int) slen;
      if (p) {
         stb_compress_hashsize(window);
         stb_compress_tofile(argv[2], p, len);
      }
   } else if (argc == 3) {
      p = stb_decompress_fromfile(argv[2], &len);
      if (p) {
         FILE *f = fopen(argv[1], "wb");
         fwrite(p,1,len,f);
         fclose(f);
      } else {
         fprintf(stderr, "FAILED.\n");
      }
   } else {
      fprintf(stderr, "Usage: stb <hashsize> <output> <filetocompress>\n"
                      "   or  stb            <output> <filetodecompress>\n");
   }
}

#if 0
// naive backtracking implementation
int wildmatch(char *expr, char *candidate)
{
   while(*expr) {
      if (*expr == '?') {
         if (!*candidate) return 0;
         ++candidate;
         ++expr;
      } else if (*expr == '*') {
         ++expr;
         while (*expr == '*' || *expr =='?') ++expr;
         // '*' at end of expression matches anything
         if (!*expr) return 1;
         // now scan candidate 'til first match
         while (*candidate) {
            if (*candidate == *expr) {
               // check this candidate
               if (stb_wildmatch(expr+1, candidate+1))
                  return 1;
               // if not, then backtrack
            }
            ++candidate;
         }
      } else {
         if (*expr != *candidate)
            return 0;
         ++expr, ++candidate;
      }
   }
   return *candidate != 0;
}

int stb_matcher_find_slow(stb_matcher *m, char *str)
{
   int result = 1;
   int i,j,y,z;
   uint16 *previous = NULL;
   uint16 *current = NULL;
   uint16 *temp;

   stb_arr_setsize(previous, 4);
   stb_arr_setsize(current, 4);

   previous = stb__add_if_inactive(m, previous, m->start_node);
   previous = stb__eps_closure(m,previous);
   if (stb__clear_goalcheck(m, previous))
      goto done;

   while (*str) {
      y = stb_arr_len(previous);
      for (i=0; i < y; ++i) {
         stb_nfa_node *n = &m->nodes[previous[i]];
         z = stb_arr_len(n->out);
         for (j=0; j < z; ++j) {
            if (n->out[j].match == *str)
               current = stb__add_if_inactive(m, current, n->out[j].node);
            else if (n->out[j].match == -1) {
               if (*str != '\n')
                  current = stb__add_if_inactive(m, current, n->out[j].node);
            } else if (n->out[j].match < -1) {
               int z = -n->out[j].match - 2;
               if (m->charset[(uint8) *str] & (1 << z))
                  current = stb__add_if_inactive(m, current, n->out[j].node);
            }
         }
      }
      ++str;
      stb_arr_setlen(previous, 0);

      temp = previous;
      previous = current;
      current = temp;

      if (!m->match_start)
         previous = stb__add_if_inactive(m, previous, m->start_node);
      previous = stb__eps_closure(m,previous);
      if (stb__clear_goalcheck(m, previous))
         goto done;
   }

   result=0;

done:
   stb_arr_free(previous);
   stb_arr_free(current);

   return result;
}
#endif






//////////////////////////////////////////////////////////////////////////
//
//   stb_parser
//
//   Generates an LR(1) parser from a grammar, and can parse with it



// Symbol representations
//
// Client:     Internal:
//    -           c=0     e aka epsilon
//    -           c=1     $ aka end of string
//   > 0        2<=c<M    terminals (note these are remapped from a sparse layout)
//   < 0        M<=c<N    non-terminals

#define END 1
#define EPS 0

short encode_term[4096];  // @TODO: malloc these
short encode_nonterm[4096];
int first_nonterm, num_symbols, symset;
#define encode_term(x)     encode_term[x]
#define encode_nonterm(x)  encode_nonterm[~(x)]
#define encode_symbol(x)   ((x) >= 0 ? encode_term(x) : encode_nonterm(x))

stb_bitset **compute_first(short ** productions)
{
   int i, changed;
   stb_bitset **first = malloc(sizeof(*first) * num_symbols);

   assert(symset);
   for (i=0; i < num_symbols; ++i)
      first[i] = stb_bitset_new(0, symset);

   for (i=END; i < first_nonterm; ++i)
      stb_bitset_setbit(first[i], i);

   for (i=0; i < stb_arr_len(productions); ++i) {
      if (productions[i][2] == 0) {
         int nt = encode_nonterm(productions[i][0]);
         stb_bitset_setbit(first[nt], EPS);
      }
   }

   do {
      changed = 0;
      for (i=0; i < stb_arr_len(productions); ++i) {
         int j, nt = encode_nonterm(productions[i][0]);
         for (j=2; productions[i][j]; ++j) {
            int z = encode_symbol(productions[i][j]);
            changed |= stb_bitset_unioneq_changed(first[nt], first[z], symset);
            if (!stb_bitset_testbit(first[z], EPS))
               break;
         }
         if (!productions[i][j] && !stb_bitset_testbit(first[nt], EPS)) {
            stb_bitset_setbit(first[nt], EPS);
            changed = 1;
         }
      }
   } while (changed);
   return first;
}

stb_bitset **compute_follow(short ** productions, stb_bitset **first, int start)
{
   int i,j,changed;
   stb_bitset **follow = malloc(sizeof(*follow) * num_symbols);

   assert(symset);
   for (i=0; i < num_symbols; ++i)
      follow[i] = (i >= first_nonterm ? stb_bitset_new(0, symset) : NULL);

   stb_bitset_setbit(follow[start], END);
   do {
      changed = 0;
      for (i=0; i < stb_arr_len(productions); ++i) {
         int nt = encode_nonterm(productions[i][0]);
         for (j=2; productions[i][j]; ++j) {
            if (productions[i][j] < 0) {
               int k,z = encode_nonterm(productions[i][j]);
               for (k=j+1; productions[i][k]; ++k) {
                  int q = encode_symbol(productions[i][k]);
                  changed |= stb_bitset_unioneq_changed(follow[z], first[q], symset);
                  if (!stb_bitset_testbit(first[q], EPS))
                     break;
               }
               if (!productions[i][k] == 0)
                  changed |= stb_bitset_unioneq_changed(follow[z], follow[nt], symset);
            }
         }
      }
   } while (changed);

   for (i=first_nonterm; i < num_symbols; ++i)
      stb_bitset_clearbit(follow[i], EPS);

   return follow;
}

void first_for_prod_plus_sym(stb_bitset **first, stb_bitset *out, short *prod, int symbol)
{
   stb_bitset_clearall(out, symset);
   for(;*prod;++prod) {
      int z = encode_symbol(*prod);
      stb_bitset_unioneq_changed(out, first[z], symset);
      if (!stb_bitset_testbit(first[z], EPS))
         return;
   }
   stb_bitset_unioneq_changed(out, first[symbol], symset);
}

#define Item(p,c,t)       ((void *) (size_t) (((t) << 18) + ((c) << 12) + ((p) << 2)))
#define ItemProd(i)       ((((uint32) (size_t) (i)) >> 2) & 1023)
#define ItemCursor(i)     ((((uint32) (size_t) (i)) >> 12) & 63)
#define ItemLookahead(i)  (((uint32) (size_t) (i)) >> 18)

static void pc(stb_ps *p)
{
}

typedef struct
{
   short *prod;
   int prod_num;
} ProdRef;

typedef struct
{
   stb_bitset **first;
   stb_bitset **follow;
   short **   prod;
   ProdRef ** prod_by_nt;
} Grammar;

stb_ps *itemset_closure(Grammar g, stb_ps *set)
{
   stb_bitset *lookahead;
   int changed,i,j,k, list_len;
   if (set == NULL) return set;
   lookahead = stb_bitset_new(0, symset);
   do {
      void **list = stb_ps_getlist(set, &list_len);
      changed = 0;
      for (i=0; i < list_len; ++i) {
         ProdRef *prod;
         int nt, *looklist;
         int p = ItemProd(list[i]), c = ItemCursor(list[i]), t = ItemLookahead(list[i]);
         if (g.prod[p][c] >= 0) continue;
         nt = encode_nonterm(g.prod[p][c]);
         first_for_prod_plus_sym(g.first, lookahead, g.prod[p]+c+1, t);
         looklist = stb_bitset_getlist(lookahead, 1, first_nonterm);
               
         prod = g.prod_by_nt[nt];
         for (j=0; j < stb_arr_len(prod); ++j) {
            assert(prod[j].prod[0] == g.prod[p][c]);
            // matched production; now iterate terminals
            for (k=0; k < stb_arr_len(looklist); ++k) {
               void *item = Item(prod[j].prod_num,2,looklist[k]);
               if (!stb_ps_find(set, item)) {
                  changed = 1;
                  set = stb_ps_add(set, item);
                  pc(set);
               }
            }
         }
         stb_arr_free(looklist);
      }
      free(list);
   } while (changed);
   free(lookahead);
   return set;
}

stb_ps *itemset_goto(Grammar g, stb_ps *set, int sym)
{
   int i, listlen;
   void **list = stb_ps_fastlist(set, &listlen);
   stb_ps *out = NULL;
   for (i=0; i < listlen; ++i) {
      int p,c;
      if (!stb_ps_fastlist_valid(list[i])) continue;
      p = ItemProd(list[i]), c = ItemCursor(list[i]);
      if (encode_symbol(g.prod[p][c]) == sym) {
         void *z = Item(p,c+1,ItemLookahead(list[i]));
         if (!stb_ps_find(out, z))
            out = stb_ps_add(out, z);
         pc(out);
      }
   }
   return itemset_closure(g, out);
}

void itemset_all_nextsym(Grammar g, stb_bitset *out, stb_ps *set)
{
   int i, listlen;
   void **list = stb_ps_fastlist(set, &listlen);
   stb_bitset_clearall(out, symset);
   pc(set);
   for (i=0; i < listlen; ++i) {
      if (stb_ps_fastlist_valid(list[i])) {
         int p = ItemProd(list[i]);
         int c = ItemCursor(list[i]);
         if (g.prod[p][c])
            stb_bitset_setbit(out, encode_symbol(g.prod[p][c]));
      }
   }
}

stb_ps ** generate_items(Grammar g, int start_prod)
{
   stb_ps ** all=NULL;
   int i,j,k;
   stb_bitset *try = stb_bitset_new(0,symset);
   stb_ps *set = NULL;
   void *item = Item(start_prod, 2, END);
   set = stb_ps_add(set, item);
   pc(set);
   set = itemset_closure(g, set);
   pc(set);
   stb_arr_push(all, set);
   for (i = 0; i < stb_arr_len(all); ++i) {
      // only try symbols that appear in all[i]... there's a smarter way to do this,
      // which is to take all[i], and divide it up by symbol
      pc(all[i]);
      itemset_all_nextsym(g, try, all[i]);
      for (j = 1; j < num_symbols; ++j) {
         if (stb_bitset_testbit(try, j)) {
            stb_ps *out;
            if (stb_arr_len(all) > 4) pc(all[4]);
            if (i == 1 && j == 29) {
               if (stb_arr_len(all) > 4) pc(all[4]);
               out = itemset_goto(g, all[i], j);
               if (stb_arr_len(all) > 4) pc(all[4]);
            } else
               out = itemset_goto(g, all[i], j);
            pc(out);
            if (stb_arr_len(all) > 4) pc(all[4]);
            if (out != NULL) {
               // add it to the array if it's not already there
               for (k=0; k < stb_arr_len(all); ++k)
                  if (stb_ps_eq(all[k], out))
                     break;
               if (k == stb_arr_len(all)) {
                  stb_arr_push(all, out);
                  pc(out);
                  if (stb_arr_len(all) > 4) pc(all[4]);
               } else
                  stb_ps_delete(out);
            }
         }
      }
   }
   free(try);
   return all;
}

typedef struct
{
   int num_stack;
   int function;
} Reduction;

typedef struct
{
   short *encode_term;
   Reduction *reductions;
   short **action_goto; // terminals are action, nonterminals are goto
   int start;
   int end_term;
} Parser;

enum
{
   A_error, A_accept, A_shift, A_reduce, A_conflict
};

typedef struct
{
   uint8 type;
   uint8 cursor;
   short prod;
   short value;
} Action;

Parser *parser_create(short **productions, int num_prod, int start_nt, int end_term)
{
   short *mini_rule = malloc(4 * sizeof(mini_rule[0]));
   Action *actions;
   Grammar g;
   stb_ps ** sets;
   Parser *p = malloc(sizeof(*p));
   int i,j,n;
   stb_bitset *mapped;
   int min_s=0, max_s=0, termset, ntset, num_states, num_reductions, init_prod;

   int synth_start;

   // remap sparse terminals and nonterminals

   for (i=0; i < num_prod; ++i) {
      for (j=2; productions[i][j]; ++j) {
         if (productions[i][j] < min_s) min_s = productions[i][j];
         if (productions[i][j] > max_s) max_s = productions[i][j];
      }
   }
   synth_start = --min_s;

   termset = (max_s + 32) >> 5;
   ntset = (~min_s + 32) >> 5;
   memset(encode_term, 0, sizeof(encode_term));
   memset(encode_nonterm, 0, sizeof(encode_nonterm));

   mapped = stb_bitset_new(0, termset);
   n = 2;
   for (i=0; i < num_prod; ++i)
      for (j=2; productions[i][j]; ++j)
         if (productions[i][j] > 0)
            if (!stb_bitset_testbit(mapped, productions[i][j])) {
               stb_bitset_setbit(mapped, productions[i][j]);
               encode_term[productions[i][j]] = n++;
            }
   free(mapped);

   first_nonterm = n;

   mapped = stb_bitset_new(0, ntset);
   for (i=0; i < num_prod; ++i)
      for (j=2; productions[i][j]; ++j)
         if (productions[i][j] < 0)
            if (!stb_bitset_testbit(mapped, ~productions[i][j])) {
               stb_bitset_setbit(mapped, ~productions[i][j]);
               encode_nonterm[~productions[i][j]] = n++;
            }
   free(mapped);

   // add a special start state for internal processing
   p->start = n++;
   encode_nonterm[synth_start] = p->start;
   mini_rule[0] = synth_start;
   mini_rule[1] = -32768;
   mini_rule[2] = start_nt;
   mini_rule[3] = 0;

   p->end_term = end_term;

   num_symbols = n;
   
   // create tables
   g.prod = NULL;
   g.prod_by_nt = malloc(num_symbols * sizeof(g.prod_by_nt[0]));
   for (i=0; i < num_symbols; ++i)
      g.prod_by_nt[i] = NULL;

   for (i=0; i < num_prod; ++i) {
      stb_arr_push(g.prod, productions[i]);
   }
   init_prod = stb_arr_len(g.prod);
   stb_arr_push(g.prod, mini_rule);

   num_reductions = stb_arr_len(g.prod);
   p->reductions = malloc(num_reductions * sizeof(*p->reductions));

   symset = (num_symbols + 31) >> 5;
   g.first = compute_first(g.prod);
   g.follow = compute_follow(g.prod, g.first, p->start);

   for (i=0; i < stb_arr_len(g.prod); ++i) {
      ProdRef pr = { g.prod[i], i };
      stb_arr_push(g.prod_by_nt[encode_nonterm(g.prod[i][0])], pr);
   }

   sets = generate_items(g, init_prod);

   num_states = stb_arr_len(sets);
   // now generate tables

   actions = malloc(sizeof(*actions) * first_nonterm);
   p->action_goto = (short **) stb_array_block_alloc(num_states, sizeof(short) * num_symbols);
   for (i=0; i < num_states; ++i) {
      int j,n;
      void **list = stb_ps_getlist(sets[i], &n);
      memset(actions, 0, sizeof(*actions) * first_nonterm);
      for (j=0; j < n; ++j) {
         int p = ItemProd(list[j]), c = ItemCursor(list[j]), t = ItemLookahead(list[j]);
         if (g.prod[p][c] == 0) {
            if (p == init_prod) {
               // @TODO: check for conflicts
               assert(actions[t].type == A_error || actions[t].type == A_accept);
               actions[t].type = A_accept;
            } else {
               // reduce production p
               if (actions[t].type == A_reduce) {
                  // is it the same reduction we already have?
                  if (actions[t].prod != p) {
                     // no, it's a reduce-reduce conflict!
                     printf("Reduce-reduce conflict for rule %d and %d, lookahead %d\n", p, actions[t].prod, t);
                     // @TODO: use precedence
                     actions[t].type = A_conflict;
                  }
               } else if (actions[t].type == A_shift) {
                  printf("Shift-reduce conflict for rule %d and %d, lookahead %d\n", actions[t].prod, p, t);
                  actions[t].type = A_conflict;
               } else if (actions[t].type == A_accept) {
                  assert(0);
               } else if (actions[t].type == A_error) {
                  actions[t].type = A_reduce;
                  actions[t].prod = p;
               }
            }
         } else if (g.prod[p][c] > 0) {
            int a = encode_symbol(g.prod[p][c]), k;
            stb_ps *out = itemset_goto(g, sets[i], a);
            for (k=0; k < stb_arr_len(sets); ++k)
               if (stb_ps_eq(sets[k], out))
                  break;
            assert(k < stb_arr_len(sets));
            // shift k
            if (actions[a].type == A_shift) {
               if (actions[a].value != k) {
                  printf("Shift-shift conflict! Rule %d and %d with lookahead %d/%d\n", actions[a].prod, p, a,t);
                  actions[a].type = A_conflict;
               }
            } else if (actions[a].type == A_reduce) {
               printf("Shift-reduce conflict for rule %d and %d, lookahead %d/%d\n", p, actions[a].prod, a,t);
               actions[a].type = A_conflict;
            } else if (actions[a].type == A_accept) {
               assert(0);
            } else if (actions[a].type == A_error) {
               actions[a].type = A_shift;
               actions[a].prod = p;
               actions[a].cursor = c;
               actions[a].value  = k;
            }
         }
      }
      // @TODO: recompile actions into p->action_goto
   }

   free(mini_rule);
   stb_pointer_array_free(g.first , num_symbols); free(g.first );
   stb_pointer_array_free(g.follow, num_symbols); free(g.follow);
   stb_arr_free(g.prod);
   for (i=0; i < num_symbols; ++i)
      stb_arr_free(g.prod_by_nt[i]);
   free(g.prod_by_nt);
   for (i=0; i < stb_arr_len(sets); ++i)
      stb_ps_delete(sets[i]);
   stb_arr_free(sets);

   return p;
}

void parser_destroy(Parser *p)
{
   free(p);
}

#if 0
enum nonterm
{
   N_globals = -50,
   N_global, N_vardef, N_varinitlist, N_varinit, N_funcdef, N_optid, N_optparamlist,
   N_paramlist, N_param, N_optinit, N_optcomma, N_statements, N_statement,
   N_optexpr, N_assign, N_if, N_ifcore, N_else, N_dictdef, N_dictdef2,
   N_dictdefitem, N_expr,
   N__last
};

short grammar[][10] =
{
   { N_globals    ,  0, N_globals, N_global                                 },
   { N_globals    ,  0                                                      },
   { N_global     ,  0, N_vardef                                            },
   { N_global     ,  0, N_funcdef                                           },
   { N_vardef     ,  0, ST_var, N_varinitlist,                               },
   { N_varinitlist,  0, N_varinitlist, ',', N_varinit                       },
   { N_varinitlist,  0, N_varinit,                                          },
   { N_varinit    ,  0, ST_id, N_optinit,                                    },
   { N_funcdef    ,  0, ST_func, N_optid, '(', N_optparamlist, ')', N_statements, ST_end },
   { N_optid      ,  0, ST_id                                                },
   { N_optid      ,  0,                                                     },
   { N_optparamlist, 0,                                                     },
   { N_optparamlist, 0, N_paramlist, N_optcomma                             },
   { N_paramlist  ,  0, N_paramlist, ',', N_param                           },
   { N_paramlist  ,  0, N_param                                             },
   { N_param      ,  0, ST_id, N_optinit                                     },
   { N_optinit    ,  0, '=', N_expr                                         },
   { N_optinit    ,  0,                                                     },
   { N_optcomma   ,  0, ','                                                 },
   { N_optcomma   ,  0,                                                     },
   { N_statements ,  0, N_statements, N_statement                           },
   { N_statement  ,  0, N_statement, ';'                                    },
   { N_statement  ,  0, N_varinit                                           },
   { N_statement  ,  0, ST_return, N_expr                                    },
   { N_statement  ,  0, ST_break , N_optexpr                                 },
   { N_optexpr    ,  0, N_expr                                              },
   { N_optexpr    ,  0,                                                     },
   { N_statement  ,  0, ST_continue                                          },
   { N_statement  ,  0, N_assign                                            },
   { N_assign     ,  0, N_expr, '=', N_assign                               },
   //{ N_assign     ,  0, N_expr                                              },
   { N_statement  ,  0, ST_while, N_expr, N_statements, ST_end                },
   { N_statement  ,  0, ST_if, N_if,                                         },
   { N_if         ,  0, N_ifcore, ST_end,                                    },
   { N_ifcore     ,  0, N_expr, ST_then, N_statements, N_else, ST_end         },
   { N_else       ,  0, ST_elseif, N_ifcore                                  },
   { N_else       ,  0, ST_else, N_statements                                },
   { N_else       ,  0,                                                     },
   { N_dictdef    ,  0, N_dictdef2, N_optcomma                              },
   { N_dictdef2   ,  0, N_dictdef2, ',', N_dictdefitem                      },
   { N_dictdef2   ,  0, N_dictdefitem                                       },
   { N_dictdefitem,  0, ST_id, '=', N_expr                                   },
   { N_dictdefitem,  0, N_expr                                              },
   { N_expr       ,  0, ST_number                                            },
   { N_expr       ,  0, ST_string                                            },
   { N_expr       ,  0, ST_id                                                },
   { N_expr       ,  0, N_funcdef                                           },
   { N_expr       ,  0, '-', N_expr                                         },
   { N_expr       ,  0, '{', N_dictdef, '}'                                 },
   { N_expr       ,  0, '(', N_expr, ')'                                    },
   { N_expr       ,  0, N_expr, '.', ST_id                                   },
   { N_expr       ,  0, N_expr, '[', N_expr, ']'                            },
   { N_expr       ,  0, N_expr, '(', N_dictdef, ')'                         },
#if 0
#define BINOP(op)  { N_expr, 0, N_expr, op, N_expr }
   BINOP(ST_and), BINOP(ST_or), BINOP(ST_eq), BINOP(ST_ne),
   BINOP(ST_le),  BINOP(ST_ge), BINOP('>') , BINOP('<' ),
   BINOP('&'), BINOP('|'), BINOP('^'), BINOP('+'), BINOP('-'),
   BINOP('*'), BINOP('/'), BINOP('%'),
#undef BINOP
#endif
};

short *grammar_list[stb_arrcount(grammar)];

void test_parser_generator(void)
{
   Parser *p;
   int i;
   assert(N__last <= 0);
   for (i=0; i < stb_arrcount(grammar); ++i)
      grammar_list[i] = grammar[i];
   p = parser_create(grammar_list, stb_arrcount(grammar), N_globals, 0);
   parser_destroy(p);
}
#endif


#if 0
// stb_threadtest.c


#include <windows.h>
#define STB_DEFINE
//#define STB_THREAD_TEST
#include "../stb.h"

#define NUM_WORK 100

void *work_consumer(void *p)
{
   stb__thread_sleep(20);
   return NULL;
}

int pass;
stb_threadqueue *tq1, *tq2, *tq3, *tq4;
volatile float t1,t2;

//    with windows.h
// Worked correctly with 100,000,000 enqueue/dequeue WAITLESS
// (770 passes, 170000 per pass)
// Worked correctly with   2,500,000 enqueue/dequeue !WAITLESS
// (15 passes, 170000 per pass)
// Worked correctly with   1,500,000 enqueue/dequeue WAITLESS && STB_THREAD_TEST
// (9 passes, 170000 per pass)
//    without windows.h
// Worked correctly with   1,000,000 enqueue/dequeue WAITLESS && STB_THREAD_TEST
// (6 passes, 170000 per pass)
// Worked correctly with     500,000 enqueue/dequeue !WAITLESS && STB_THREAD_TEST
// (3 passes, 170000 per pass)
// Worked correctly with   1,000,000 enqueue/dequeue WAITLESS
// (15 passes, 170000 per pass)
#define WAITLESS

volatile int table[1000*1000*10];

void wait(int n)
{
#ifndef WAITLESS
   int j;
   float y;
   for (j=0; j < n; ++j)
      y += 1 / (t1+j);
   t2 = y;
#endif
}

void *tq1_consumer(void *p)
{
   for(;;) {
      int z;
      float y = 0;
      stb_threadq_get_block(tq1, &z);
      wait(5000);
      table[z] = pass;
   }
}

void *tq2_consumer(void *p)
{
   for(;;) {
      int z;
      if (stb_threadq_get(tq2, &z))
         table[z] = pass;
      wait(1000);
   }
}

void *tq3_consumer(void *p)
{
   for(;;) {
      int z;
      stb_threadq_get_block(tq3, &z);
      table[z] = pass;
      wait(500);
   }
}

void *tq4_consumer(void *p)
{
   for (;;) {
      int z;
      stb_threadq_get_block(tq4, &z);
      table[z] = pass;
      wait(500);
   }
}

typedef struct
{
   int start, end;
   stb_threadqueue *tq;
   int delay;
} write_data;

void *writer(void *q)
{
   int i;
   write_data *p = (write_data *) q;
   for (i=p->start; i < p->end; ++i) {
      stb_threadq_add_block(p->tq, &i);
      #ifndef WAITLESS
      if (p->delay) stb__thread_sleep(p->delay);
      else {
         int j;
         float z = 0;
         for (j=0; j <= 20; ++j)
            z += 1 / (t1+j);
         t2 = z;
      }
      #endif
   }
   return NULL;
}

write_data info[256];
int pos;

void start_writer(int z, int count, stb_threadqueue *tq, int delay)
{
   info[z].start = pos;
   info[z].end = pos+count;
   info[z].tq = tq;
   info[z].delay = delay;
   stb_create_thread(writer, &info[z]);
   pos += count;
}

int main(int argc, char **argv)
{
   int i;
   stb_sync s = stb_sync_new();
   stb_sync_set_target(s, NUM_WORK+1);
   stb_work_numthreads(2);
   for (i=0; i < NUM_WORK; ++i) {
      stb_work_reach(work_consumer, NULL, NULL, s);
   }
   printf("Started stb_work test.\n");

   t1 = 1;

   // create the queues
   tq1 = stb_threadq_new(4, 4, TRUE , TRUE);
   tq2 = stb_threadq_new(4, 4, TRUE , FALSE);
   tq3 = stb_threadq_new(4, 4, FALSE, TRUE);
   tq4 = stb_threadq_new(4, 4, FALSE, FALSE);

   // start the consumers
   stb_create_thread(tq1_consumer, NULL);
   stb_create_thread(tq1_consumer, NULL);
   stb_create_thread(tq1_consumer, NULL);

   stb_create_thread(tq2_consumer, NULL);

   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);
   stb_create_thread(tq3_consumer, NULL);

   stb_create_thread(tq4_consumer, NULL);

   for (pass=1; pass <= 5000; ++pass) {
      int z = 0;
      int last_n = -1;
      int identical = 0;
      pos = 0;
      start_writer(z++, 50000, tq1, 0);
      start_writer(z++, 50000, tq1, 0);
      start_writer(z++, 50000, tq1, 0);

      start_writer(z++, 5000, tq2, 1);
      start_writer(z++, 3000, tq2, 3);
      start_writer(z++, 2000, tq2, 5);

      start_writer(z++, 5000, tq3, 3);

      start_writer(z++, 5000, tq4, 3);
      #ifndef WAITLESS
      stb__thread_sleep(8000);
      #endif
      for(;;) {
         int n =0;
         for (i=0; i < pos; ++i) {
            if (table[i] == pass)
               ++n;
         }
         if (n == pos) break;
         if (n == last_n) {
            ++identical;
            if (identical == 3) {
               printf("Problem slots:\n");
               for (i=0; i < pos; ++i) {
                  if (table[i] != pass) printf("%d ", i);
               }
               printf("\n");
            } else {
               if (identical < 3)
                  printf("Processed %d of %d\n", n, pos);
               else
                  printf(".");
            }
         } else {
            identical = 0;
            printf("Processed %d of %d\n", n, pos);
         }
         last_n = n;
         #ifdef WAITLESS
         stb__thread_sleep(750);
         #else
         stb__thread_sleep(3000);
         #endif
      }
      printf("Finished pass %d\n", pass);
   }

   stb_sync_reach_and_wait(s);
   printf("stb_work test completed ok.\n");
   return 0;
}
#endif


#if 0
//////////////////////////////////////////////////////////////////////////////
//
//   collapse tree leaves up to parents until we only have N nodes
//   useful for cmirror summaries

typedef struct stb_summary_tree
{
   struct stb_summary_tree **children;
   int num_children;
   float weight;
} stb_summary_tree;

STB_EXTERN void *stb_summarize_tree(void *tree, int limit, float reweight);

#ifdef STB_DEFINE

typedef struct stb_summary_tree2
{
   STB__ARR(struct stb_summary_tree2 *) children;
   int num_children;
   float weight;
   float weight_with_all_children;
   float makes_target_weight;
   float weight_at_target;
   stb_summary_tree *original;
   struct stb_summary_tree2 *target;
   STB__ARR(struct stb_summary_tree2 *) targeters;
} stb_summary_tree2;

static stb_summary_tree2 *stb__summarize_clone(stb_summary_tree *t)
{
   int i;
   stb_summary_tree2 *s;
   s = (stb_summary_tree2 *) malloc(sizeof(*s));
   s->original = t;
   s->weight = t->weight;
   s->weight_with_all_children = 0;
   s->weight_at_target = 0;
   s->target = NULL;
   s->targeters = NULL;
   s->num_children = t->num_children;
   s->children = NULL;
   for (i=0; i < s->num_children; ++i)
      stb_arr_push(s->children, stb__summarize_clone(t->children[i]));
   return s;
}

static float stb__summarize_compute_targets(stb_summary_tree2 *parent, stb_summary_tree2 *node, float reweight, float weight)
{
   float total = 0;
   if (node->weight == 0 && node->num_children == 1 && parent) {
      node->target = parent;
      return stb__summarize_compute_targets(parent, node->children[0], reweight, weight*reweight);
   } else {
      float total=0;
      int i;
      for (i=0; i < node->num_children; ++i)
         total += stb__summarize_compute_targets(node, node->children[i], reweight, reweight);
      node->weight_with_all_children = total + node->weight;
      if (parent && node->weight_with_all_children) {
         node->target = parent;
         node->weight_at_target = node->weight_with_all_children * weight;
         node->makes_target_weight = node->weight_at_target + parent->weight;
         stb_arr_push(parent->targeters, node);
      } else {
         node->target = NULL;
         node->weight_at_target = node->weight;
         node->makes_target_weight = 0;
      }
      return node->weight_with_all_children * weight;
   }      
}

static stb_summary_tree2 ** stb__summarize_make_array(STB__ARR(stb_summary_tree2 *) all, stb_summary_tree2 *tree)
{
   int i;
   stb_arr_push(all, tree);
   for (i=0; i < tree->num_children; ++i)
      all = stb__summarize_make_array(all, tree->children[i]);
   return all;
}

typedef stb_summary_tree2 * stb__stree2;
stb_define_sort(stb__summarysort, stb__stree2, (*a)->makes_target_weight < (*b)->makes_target_weight)

void *stb_summarize_tree(void *tree, int limit, float reweight)
{
   int i,j,k;
   STB__ARR(stb_summary_tree *) ret=NULL;
   STB__ARR(stb_summary_tree2 *) all=NULL;

   // first clone the tree so we can manipulate it
   stb_summary_tree2 *t = stb__summarize_clone((stb_summary_tree *) tree);
   if (reweight < 1) reweight = 1;

   // now compute how far up the tree each node would get pushed
   // there's no value in pushing a node up to an empty node with
   // only one child, so we keep pushing it up
   stb__summarize_compute_targets(NULL, t, reweight, 1);

   all = stb__summarize_make_array(all, t);

   // now we want to iteratively find the smallest 'makes_target_weight',
   // update that, and then fix all the others (which will be all descendents)
   // to do this efficiently, we need a heap or a sorted binary tree
   // what we have is an array. maybe we can insertion sort the array?
   stb__summarysort(all, stb_arr_len(all));

   for (i=0; i < stb_arr_len(all) - limit; ++i) {
      stb_summary_tree2 *src, *dest;
      src = all[i];
      dest = all[i]->target;
      if (src->makes_target_weight == 0) continue;
      assert(dest != NULL);

      for (k=0; k < stb_arr_len(all); ++k)
         if (all[k] == dest)
            break;
      assert(k != stb_arr_len(all));
      assert(i < k);

      // move weight from all[i] to target
      src->weight = dest->makes_target_weight;
      src->weight = 0;
      src->makes_target_weight = 0;
      // recompute effect of other descendents
      for (j=0; j < stb_arr_len(dest->targeters); ++j) {
         if (dest->targeters[j]->weight) {
            dest->targeters[j]->makes_target_weight = dest->weight + dest->targeters[j]->weight_at_target;
            assert(dest->targeters[j]->makes_target_weight <= dest->weight_with_all_children);
         }
      }
      STB_(stb__summarysort,_ins_sort)(all+i, stb_arr_len(all)-i);
   }
   // now the elements in [ i..stb_arr_len(all) ) are the relevant ones
   for (; i < stb_arr_len(all); ++i)
      stb_arr_push(ret, all[i]->original);

   // now free all our temp data
   for (i=0; i < stb_arr_len(all); ++i) {
      stb_arr_free(all[i]->children);
      free(all[i]);
   }
   stb_arr_free(all);
   return ret;
}
#endif

#endif