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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2013. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Common compiler front-end.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "sys.h"
#ifdef __WIN32__
#include <winbase.h>
/* FIXE ME config_win32.h? */
#define HAVE_STRERROR 1
#define snprintf _snprintf
#endif

#include <ctype.h>

#define NO 0
#define YES 1

#define ASIZE(a) (sizeof(a)/sizeof(a[0]))

static int debug = 0; /* Bit flags for debug printouts. */

static char** eargv_base; /* Base of vector. */
static char** eargv; /* First argument for erl. */

static int eargc; /* Number of arguments in eargv. */

#ifdef __WIN32__
# define QUOTE(s) possibly_quote(s)
# define IS_DIRSEP(c) ((c) == '/' || (c) == '\\')
# define ERL_NAME "erl.exe"
#else
# define QUOTE(s) s
# define IS_DIRSEP(c) ((c) == '/')
# define ERL_NAME "erl"
#endif

#define UNSHIFT(s) eargc++, eargv--; eargv[0] = QUOTE(s)
#define PUSH(s) eargv[eargc++] = QUOTE(s)
#define PUSH2(s, t) PUSH(s); PUSH(t)
#define PUSH3(s, t, u) PUSH2(s, t); PUSH(u)

#ifdef __WIN32__
static int pause_after_execution = 0;
#endif

/*
* Local functions.
*/

static char* process_opt(int* pArgc, char*** pArgv, int offset);
static void error(char* format, ...);
static char* emalloc(size_t size);
static char* strsave(char* string);
static void push_words(char* src);
static int run_erlang(char* name, char** argv);
static char* get_default_emulator(char* progname);
#ifdef __WIN32__
static char* possibly_quote(char* arg);
#endif

/*
* Supply a strerror() function if libc doesn't.
*/
#ifndef HAVE_STRERROR

extern int sys_nerr;

#ifndef SYS_ERRLIST_DECLARED
extern const char * const sys_errlist[];
#endif /* !SYS_ERRLIST_DECLARED */

char *strerror(int errnum)
{
  static char *emsg[1024];

  if (errnum != 0) {
    if (errnum > 0 && errnum < sys_nerr)
      sprintf((char *) &emsg[0], "(%s)", sys_errlist[errnum]);
    else
      sprintf((char *) &emsg[0], "errnum = %d ", errnum);
  }
  else {
    emsg[0] = '\0';
  }
  return (char *) &emsg[0];
}
#endif /* !HAVE_STRERROR */

static char *
get_env(char *key)
{
#ifdef __WIN32__
    DWORD size = 32;
    char *value=NULL;
    wchar_t *wcvalue = NULL;
    wchar_t wckey[256];
    int len;

    MultiByteToWideChar(CP_UTF8, 0, key, -1, wckey, 256);
    
    while (1) {
DWORD nsz;
if (wcvalue)
free(wcvalue);
wcvalue = (wchar_t *) emalloc(size*sizeof(wchar_t));
SetLastError(0);
nsz = GetEnvironmentVariableW(wckey, wcvalue, size);
if (nsz == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
free(wcvalue);
return NULL;
}
if (nsz <= size) {
len = WideCharToMultiByte(CP_UTF8, 0, wcvalue, -1, NULL, 0, NULL, NULL);
value = emalloc(len*sizeof(char));
WideCharToMultiByte(CP_UTF8, 0, wcvalue, -1, value, len, NULL, NULL);
free(wcvalue);
return value;
}
size = nsz;
    }
#else
    return getenv(key);
#endif
}

static void
free_env_val(char *value)
{
#ifdef __WIN32__
    if (value)
free(value);
#endif
}

#ifdef __WIN32__
int wmain(int argc, wchar_t **wcargv)
{
    char** argv;
#else
int main(int argc, char** argv)
{
#endif
    int eargv_size;
    int eargc_base; /* How many arguments in the base of eargv. */
    char* emulator;
    char *env;

#ifdef __WIN32__
    int i;
    int len;
    /* Convert argv to utf8 */
    argv = malloc((argc+1) * sizeof(char*));
    for (i=0; i<argc; i++) {
len = WideCharToMultiByte(CP_UTF8, 0, wcargv[i], -1, NULL, 0, NULL, NULL);
argv[i] = malloc(len*sizeof(char));
WideCharToMultiByte(CP_UTF8, 0, wcargv[i], -1, argv[i], len, NULL, NULL);
    }
    argv[argc] = NULL;
#endif

    env = get_env("ERLC_EMULATOR");
    emulator = env ? env : get_default_emulator(argv[0]);

    if (strlen(emulator) >= MAXPATHLEN)
        error("Value of environment variable ERLC_EMULATOR is too large");

    /*
* Allocate the argv vector to be used for arguments to Erlang.
* Arrange for starting to pushing information in the middle of
* the array, to allow easy adding of emulator options (like -pa)
* before '-s erlcompile compile_cmdline...'.
*
* Oh, by the way, we will push the compiler command in the
* base of the eargv vector, and move it up later.
*/

    eargv_size = argc*6+100;
    eargv_base = (char **) emalloc(eargv_size*sizeof(char*));
    eargv = eargv_base;
    eargc = 0;
    push_words(emulator);
    eargc_base = eargc;
    eargv = eargv + eargv_size/2;
    eargc = 0;

    free_env_val(env);

    /*
* Push initial arguments.
*/

    PUSH("+sbtu");
    PUSH("+A0");
    PUSH("-noinput");
    PUSH2("-mode", "minimal");
    PUSH2("-boot", "start_clean");
    PUSH3("-s", "erl_compile", "compile_cmdline");
    PUSH("-extra");

    /*
* Push standard arguments to Erlang.
*/

    /*
* Parse all command line switches.
*/

    while (argc > 1) {

/*
* Options starting with '+' are passed on to Erlang.
*/

switch (argv[1][0]) {
case '+':
PUSH(argv[1]);
break;
case '-':
switch (argv[1][1]) {
case 'd':
if (argv[1][2] == '\0') {
debug = 1;
} else {
PUSH(argv[1]);
}
break;
case 'p':
{
int c = argv[1][2];

if (c != 'a' && c != 'z') {
PUSH(argv[1]);
#ifdef __WIN32__
} else if (strcmp(argv[1], "-pause") == 0) {
pause_after_execution = 1;
#endif
} else {
char option[4];

UNSHIFT(process_opt(&argc, &argv, 1));
option[0] = '-';
option[1] = 'p';
option[2] = c;
option[3] = '\0';
UNSHIFT(strsave(option));
}
}
break;
case 's':
if (strcmp(argv[1], "-smp") == 0) {
UNSHIFT(argv[1]);
} else {
PUSH(argv[1]);
}
break;
default:
PUSH(argv[1]);
break;
}
break;
default:
PUSH(argv[1]);
break;
}
argc--, argv++;
    }

    /*
* Move up the commands for invoking the emulator and adjust eargv
* accordingly.
*/

    while (--eargc_base >= 0) {
UNSHIFT(eargv_base[eargc_base]);
    }
    
    /*
* Invoke Erlang with the collected options.
*/

    PUSH(NULL);
    return run_erlang(eargv[0], eargv);
}

static char*
process_opt(int* pArgc, char*** pArgv, int offset)
{
    int argc = *pArgc;
    char** argv = *pArgv;
    int c = argv[1][1];
    
    if (argv[1][2+offset] != '\0') {
/*
* The option was given as -x<value>.
*/
return argv[1]+2+offset;
    }

    /*
* Look at the next argument.
*/

    argc--, argv++;
    if (argc < 2 || argv[1][0] == '-')
error("No value given to -%c option", c);
    *pArgc = argc;
    *pArgv = argv;
    return argv[1];
}

static void
push_words(char* src)
{
    char sbuf[MAXPATHLEN];
    char* dst;

    dst = sbuf;
    while ((*dst++ = *src++) != '\0') {
if (isspace((int)*src)) {
*dst = '\0';
PUSH(strsave(sbuf));
dst = sbuf;
do {
src++;
} while (isspace((int)*src));
}
    }
    if (sbuf[0])
PUSH(strsave(sbuf));
}
#ifdef __WIN32__
wchar_t *make_commandline(char **argv)
{
    static wchar_t *buff = NULL;
    static int siz = 0;
    int num = 0, len;
    char **arg;
    wchar_t *p;

    if (*argv == NULL) {
return L"";
    }
    for (arg = argv; *arg != NULL; ++arg) {
num += strlen(*arg)+1;
    }
    if (!siz) {
siz = num;
buff = (wchar_t *) emalloc(siz*sizeof(wchar_t));
    } else if (siz < num) {
siz = num;
buff = (wchar_t *) realloc(buff,siz*sizeof(wchar_t));
    }
    p = buff;
    num=0;
    for (arg = argv; *arg != NULL; ++arg) {
len = MultiByteToWideChar(CP_UTF8, 0, *arg, -1, p, siz);
p+=(len-1);
*p++=L' ';
    }
    *(--p) = L'\0';

    if (debug) {
printf("Processed command line:%S\n",buff);
    }
    return buff;
}

int my_spawnvp(char **argv)
{
    STARTUPINFOW siStartInfo;
    PROCESS_INFORMATION piProcInfo;
    DWORD ec;

    memset(&siStartInfo,0,sizeof(STARTUPINFOW));
    siStartInfo.cb = sizeof(STARTUPINFOW);
    siStartInfo.dwFlags = STARTF_USESTDHANDLES;
    siStartInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
    siStartInfo.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
    siStartInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);
    siStartInfo.wShowWindow = SW_HIDE;
    siStartInfo.dwFlags |= STARTF_USESHOWWINDOW;


    if (!CreateProcessW(NULL,
make_commandline(argv),
NULL,
NULL,
TRUE,
0,
NULL,
NULL,
&siStartInfo,
&piProcInfo)) {
return -1;
    }
    CloseHandle(piProcInfo.hThread);

    WaitForSingleObject(piProcInfo.hProcess,INFINITE);
    if (!GetExitCodeProcess(piProcInfo.hProcess,&ec)) {
return 0;
    }
    return (int) ec;
}
#endif /* __WIN32__ */


static int
run_erlang(char* progname, char** argv)
{
#ifdef __WIN32__
    int status;
#endif

    if (debug) {
int i = 0;
while (argv[i] != NULL)
printf(" %s", argv[i++]);
printf("\n");
    }

#ifdef __WIN32__
    /*
* Alas, we must wait here for the program to finish.
* Otherwise, the shell from which we was executed will think
* we are finished and print a prompt and read keyboard input.
*/

    status = my_spawnvp(argv)/*_spawnvp(_P_WAIT,progname,argv)*/;
    if (status == -1) {
fprintf(stderr, "erlc: Error executing '%s': %d", progname,
GetLastError());
    }
    if (pause_after_execution) {
fprintf(stderr, "Press ENTER to continue . . .\n");
while (getchar() != '\n')
;
    }
    return status;
#else
    execvp(progname, argv);
    error("Error %d executing \'%s\'.", errno, progname);
    return 2;
#endif
}

static void
error(char* format, ...)
{
    char sbuf[1024];
    va_list ap;
    
    va_start(ap, format);
    erts_vsnprintf(sbuf, sizeof(sbuf), format, ap);
    va_end(ap);
    fprintf(stderr, "erlc: %s\n", sbuf);
    exit(1);
}

static char*
emalloc(size_t size)
{
  char *p = malloc(size);
  if (p == NULL)
    error("Insufficient memory");
  return p;
}

static char*
strsave(char* string)
{
  char* p = emalloc(strlen(string)+1);
  strcpy(p, string);
  return p;
}

static int
file_exists(char *progname)
{
#ifdef __WIN32__
    wchar_t wcsbuf[MAXPATHLEN];
    MultiByteToWideChar(CP_UTF8, 0, progname, -1, wcsbuf, MAXPATHLEN);
    return (_waccess(wcsbuf, 0) != -1);
#else
    return (access(progname, 1) != -1);
#endif
}

static char*
get_default_emulator(char* progname)
{
    char sbuf[MAXPATHLEN];
    char* s;

    if (strlen(progname) >= sizeof(sbuf))
        return ERL_NAME;

    strcpy(sbuf, progname);
    for (s = sbuf+strlen(sbuf); s >= sbuf; s--) {
if (IS_DIRSEP(*s)) {
strcpy(s+1, ERL_NAME);
if(file_exists(sbuf))
return strsave(sbuf);
break;
}
    }
    return ERL_NAME;
}

#ifdef __WIN32__
static char*
possibly_quote(char* arg)
{
    int mustQuote = NO;
    int n = 0;
    char* s;
    char* narg;

    if (arg == NULL) {
return arg;
    }

    /*
* Scan the string to find out if it needs quoting and return
* the original argument if not.
*/

    for (s = arg; *s; s++, n++) {
switch(*s) {
case ' ':
mustQuote = YES;
continue;
case '"':
mustQuote = YES;
n++;
continue;
case '\\':
if(s[1] == '"')
n++;
continue;
default:
continue;
}
    }
    if (!mustQuote) {
return arg;
    }

    /*
* Insert the quotes and put a backslash in front of every quote
* inside the string.
*/

    s = narg = emalloc(n+2+1);
    for (*s++ = '"'; *arg; arg++, s++) {
if (*arg == '"' || (*arg == '\\' && arg[1] == '"')) {
*s++ = '\\';
}
*s = *arg;
    }
    if (s[-1] == '\\') {
*s++ ='\\';
    }
    *s++ = '"';
    *s = '\0';
    return narg;
}
#endif /* __WIN32__ */
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