forked from schacon/perl
/
util.c
2220 lines (1981 loc) · 44.2 KB
/
util.c
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/* util.c
*
* Copyright (c) 1991-1994, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "Very useful, no doubt, that was to Saruman; yet it seems that he was
* not content." --Gandalf
*/
#include "EXTERN.h"
#include "perl.h"
#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
#include <signal.h>
#endif
#ifndef SIG_ERR
# define SIG_ERR ((Sighandler_t) -1)
#endif
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
# include <unistd.h>
#endif
#ifdef I_VFORK
# include <vfork.h>
#endif
/* Put this after #includes because fork and vfork prototypes may
conflict.
*/
#ifndef HAS_VFORK
# define vfork fork
#endif
#ifdef I_FCNTL
# include <fcntl.h>
#endif
#ifdef I_SYS_FILE
# include <sys/file.h>
#endif
#ifdef I_SYS_WAIT
# include <sys/wait.h>
#endif
#define FLUSH
#ifdef LEAKTEST
static void xstat _((void));
#endif
#ifndef MYMALLOC
/* paranoid version of malloc */
/* NOTE: Do not call the next three routines directly. Use the macros
* in handy.h, so that we can easily redefine everything to do tracking of
* allocated hunks back to the original New to track down any memory leaks.
* XXX This advice seems to be widely ignored :-( --AD August 1996.
*/
Malloc_t
safemalloc(size)
MEM_SIZE size;
{
Malloc_t ptr;
#ifdef HAS_64K_LIMIT
if (size > 0xffff) {
PerlIO_printf(PerlIO_stderr(), "Allocation too large: %lx\n", size) FLUSH;
my_exit(1);
}
#endif /* HAS_64K_LIMIT */
#ifdef DEBUGGING
if ((long)size < 0)
croak("panic: malloc");
#endif
ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */
#if !(defined(I286) || defined(atarist))
DEBUG_m(PerlIO_printf(Perl_debug_log, "0x%x: (%05d) malloc %ld bytes\n",ptr,an++,(long)size));
#else
DEBUG_m(PerlIO_printf(Perl_debug_log, "0x%lx: (%05d) malloc %ld bytes\n",ptr,an++,(long)size));
#endif
if (ptr != Nullch)
return ptr;
else if (nomemok)
return Nullch;
else {
PerlIO_puts(PerlIO_stderr(),no_mem) FLUSH;
my_exit(1);
}
/*NOTREACHED*/
}
/* paranoid version of realloc */
Malloc_t
saferealloc(where,size)
Malloc_t where;
MEM_SIZE size;
{
Malloc_t ptr;
#if !defined(STANDARD_C) && !defined(HAS_REALLOC_PROTOTYPE)
Malloc_t realloc();
#endif /* !defined(STANDARD_C) && !defined(HAS_REALLOC_PROTOTYPE) */
#ifdef HAS_64K_LIMIT
if (size > 0xffff) {
PerlIO_printf(PerlIO_stderr(),
"Reallocation too large: %lx\n", size) FLUSH;
my_exit(1);
}
#endif /* HAS_64K_LIMIT */
if (!where)
croak("Null realloc");
#ifdef DEBUGGING
if ((long)size < 0)
croak("panic: realloc");
#endif
ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */
#if !(defined(I286) || defined(atarist))
DEBUG_m( {
PerlIO_printf(Perl_debug_log, "0x%x: (%05d) rfree\n",where,an++);
PerlIO_printf(Perl_debug_log, "0x%x: (%05d) realloc %ld bytes\n",ptr,an++,(long)size);
} )
#else
DEBUG_m( {
PerlIO_printf(Perl_debug_log, "0x%lx: (%05d) rfree\n",where,an++);
PerlIO_printf(Perl_debug_log, "0x%lx: (%05d) realloc %ld bytes\n",ptr,an++,(long)size);
} )
#endif
if (ptr != Nullch)
return ptr;
else if (nomemok)
return Nullch;
else {
PerlIO_puts(PerlIO_stderr(),no_mem) FLUSH;
my_exit(1);
}
/*NOTREACHED*/
}
/* safe version of free */
void
safefree(where)
Malloc_t where;
{
#if !(defined(I286) || defined(atarist))
DEBUG_m( PerlIO_printf(Perl_debug_log, "0x%x: (%05d) free\n",where,an++));
#else
DEBUG_m( PerlIO_printf(Perl_debug_log, "0x%lx: (%05d) free\n",where,an++));
#endif
if (where) {
/*SUPPRESS 701*/
free(where);
}
}
/* safe version of calloc */
Malloc_t
safecalloc(count, size)
MEM_SIZE count;
MEM_SIZE size;
{
Malloc_t ptr;
#ifdef HAS_64K_LIMIT
if (size * count > 0xffff) {
PerlIO_printf(PerlIO_stderr(),
"Allocation too large: %lx\n", size * count) FLUSH;
my_exit(1);
}
#endif /* HAS_64K_LIMIT */
#ifdef DEBUGGING
if ((long)size < 0 || (long)count < 0)
croak("panic: calloc");
#endif
#if !(defined(I286) || defined(atarist))
DEBUG_m(PerlIO_printf(PerlIO_stderr(), "0x%x: (%05d) calloc %ld x %ld bytes\n",ptr,an++,(long)count,(long)size));
#else
DEBUG_m(PerlIO_printf(PerlIO_stderr(), "0x%lx: (%05d) calloc %ld x %ld bytes\n",ptr,an++,(long)count,(long)size));
#endif
size *= count;
ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */
if (ptr != Nullch) {
memset((void*)ptr, 0, size);
return ptr;
}
else if (nomemok)
return Nullch;
else {
PerlIO_puts(PerlIO_stderr(),no_mem) FLUSH;
my_exit(1);
}
/*NOTREACHED*/
}
#endif /* !MYMALLOC */
#ifdef LEAKTEST
#define ALIGN sizeof(long)
Malloc_t
safexmalloc(x,size)
I32 x;
MEM_SIZE size;
{
register Malloc_t where;
where = safemalloc(size + ALIGN);
xcount[x]++;
where[0] = x % 100;
where[1] = x / 100;
return where + ALIGN;
}
Malloc_t
safexrealloc(where,size)
Malloc_t where;
MEM_SIZE size;
{
register Malloc_t new = saferealloc(where - ALIGN, size + ALIGN);
return new + ALIGN;
}
void
safexfree(where)
Malloc_t where;
{
I32 x;
if (!where)
return;
where -= ALIGN;
x = where[0] + 100 * where[1];
xcount[x]--;
safefree(where);
}
Malloc_t
safexcalloc(x,count,size)
I32 x;
MEM_SIZE count;
MEM_SIZE size;
{
register Malloc_t where;
where = safexmalloc(x, size * count + ALIGN);
xcount[x]++;
memset((void*)where + ALIGN, 0, size * count);
where[0] = x % 100;
where[1] = x / 100;
return where + ALIGN;
}
static void
xstat()
{
register I32 i;
for (i = 0; i < MAXXCOUNT; i++) {
if (xcount[i] > lastxcount[i]) {
PerlIO_printf(PerlIO_stderr(),"%2d %2d\t%ld\n", i / 100, i % 100, xcount[i]);
lastxcount[i] = xcount[i];
}
}
}
#endif /* LEAKTEST */
/* copy a string up to some (non-backslashed) delimiter, if any */
char *
cpytill(to,from,fromend,delim,retlen)
register char *to;
register char *from;
register char *fromend;
register int delim;
I32 *retlen;
{
char *origto = to;
for (; from < fromend; from++,to++) {
if (*from == '\\') {
if (from[1] == delim)
from++;
else if (from[1] == '\\')
*to++ = *from++;
}
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
*retlen = to - origto;
return from;
}
/* return ptr to little string in big string, NULL if not found */
/* This routine was donated by Corey Satten. */
char *
instr(big, little)
register char *big;
register char *little;
{
register char *s, *x;
register I32 first;
if (!little)
return big;
first = *little++;
if (!first)
return big;
while (*big) {
if (*big++ != first)
continue;
for (x=big,s=little; *s; /**/ ) {
if (!*x)
return Nullch;
if (*s++ != *x++) {
s--;
break;
}
}
if (!*s)
return big-1;
}
return Nullch;
}
/* same as instr but allow embedded nulls */
char *
ninstr(big, bigend, little, lend)
register char *big;
register char *bigend;
char *little;
char *lend;
{
register char *s, *x;
register I32 first = *little;
register char *littleend = lend;
if (!first && little >= littleend)
return big;
if (bigend - big < littleend - little)
return Nullch;
bigend -= littleend - little++;
while (big <= bigend) {
if (*big++ != first)
continue;
for (x=big,s=little; s < littleend; /**/ ) {
if (*s++ != *x++) {
s--;
break;
}
}
if (s >= littleend)
return big-1;
}
return Nullch;
}
/* reverse of the above--find last substring */
char *
rninstr(big, bigend, little, lend)
register char *big;
char *bigend;
char *little;
char *lend;
{
register char *bigbeg;
register char *s, *x;
register I32 first = *little;
register char *littleend = lend;
if (!first && little >= littleend)
return bigend;
bigbeg = big;
big = bigend - (littleend - little++);
while (big >= bigbeg) {
if (*big-- != first)
continue;
for (x=big+2,s=little; s < littleend; /**/ ) {
if (*s++ != *x++) {
s--;
break;
}
}
if (s >= littleend)
return big+1;
}
return Nullch;
}
/*
* Set up for a new ctype locale.
*/
void
perl_new_ctype(newctype)
char *newctype;
{
#ifdef USE_LOCALE_CTYPE
int i;
for (i = 0; i < 256; i++) {
if (isUPPER_LC(i))
fold_locale[i] = toLOWER_LC(i);
else if (isLOWER_LC(i))
fold_locale[i] = toUPPER_LC(i);
else
fold_locale[i] = i;
}
#endif /* USE_LOCALE_CTYPE */
}
/*
* Set up for a new collation locale.
*/
void
perl_new_collate(newcoll)
char *newcoll;
{
#ifdef USE_LOCALE_COLLATE
if (! newcoll) {
if (collation_name) {
++collation_ix;
Safefree(collation_name);
collation_name = NULL;
collation_standard = TRUE;
collxfrm_base = 0;
collxfrm_mult = 2;
}
return;
}
if (! collation_name || strNE(collation_name, newcoll)) {
++collation_ix;
Safefree(collation_name);
collation_name = savepv(newcoll);
collation_standard = (strEQ(newcoll, "C") || strEQ(newcoll, "POSIX"));
{
/* 2: at most so many chars ('a', 'b'). */
/* 50: surely no system expands a char more. */
#define XFRMBUFSIZE (2 * 50)
char xbuf[XFRMBUFSIZE];
Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
SSize_t mult = fb - fa;
if (mult < 1)
croak("strxfrm() gets absurd");
collxfrm_base = (fa > mult) ? (fa - mult) : 0;
collxfrm_mult = mult;
}
}
#endif /* USE_LOCALE_COLLATE */
}
/*
* Set up for a new numeric locale.
*/
void
perl_new_numeric(newnum)
char *newnum;
{
#ifdef USE_LOCALE_NUMERIC
if (! newnum) {
if (numeric_name) {
Safefree(numeric_name);
numeric_name = NULL;
numeric_standard = TRUE;
numeric_local = TRUE;
}
return;
}
if (! numeric_name || strNE(numeric_name, newnum)) {
Safefree(numeric_name);
numeric_name = savepv(newnum);
numeric_standard = (strEQ(newnum, "C") || strEQ(newnum, "POSIX"));
numeric_local = TRUE;
}
#endif /* USE_LOCALE_NUMERIC */
}
void
perl_set_numeric_standard()
{
#ifdef USE_LOCALE_NUMERIC
if (! numeric_standard) {
setlocale(LC_NUMERIC, "C");
numeric_standard = TRUE;
numeric_local = FALSE;
}
#endif /* USE_LOCALE_NUMERIC */
}
void
perl_set_numeric_local()
{
#ifdef USE_LOCALE_NUMERIC
if (! numeric_local) {
setlocale(LC_NUMERIC, numeric_name);
numeric_standard = FALSE;
numeric_local = TRUE;
}
#endif /* USE_LOCALE_NUMERIC */
}
/*
* Initialize locale awareness.
*/
int
perl_init_i18nl10n(printwarn)
int printwarn;
{
int ok = 1;
/* returns
* 1 = set ok or not applicable,
* 0 = fallback to C locale,
* -1 = fallback to C locale failed
*/
#ifdef USE_LOCALE
#ifdef USE_LOCALE_CTYPE
char *curctype = NULL;
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
char *curcoll = NULL;
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
char *curnum = NULL;
#endif /* USE_LOCALE_NUMERIC */
char *lc_all = getenv("LC_ALL");
char *lang = getenv("LANG");
bool setlocale_failure = FALSE;
#ifdef LOCALE_ENVIRON_REQUIRED
/*
* Ultrix setlocale(..., "") fails if there are no environment
* variables from which to get a locale name.
*/
bool done = FALSE;
#ifdef LC_ALL
if (lang) {
if (setlocale(LC_ALL, ""))
done = TRUE;
else
setlocale_failure = TRUE;
}
if (!setlocale_failure)
#endif /* LC_ALL */
{
#ifdef USE_LOCALE_CTYPE
if (! (curctype = setlocale(LC_CTYPE,
(!done && (lang || getenv("LC_CTYPE")))
? "" : Nullch)))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
if (! (curcoll = setlocale(LC_COLLATE,
(!done && (lang || getenv("LC_COLLATE")))
? "" : Nullch)))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
if (! (curnum = setlocale(LC_NUMERIC,
(!done && (lang || getenv("LC_NUMERIC")))
? "" : Nullch)))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_NUMERIC */
}
#else /* !LOCALE_ENVIRON_REQUIRED */
#ifdef LC_ALL
if (! setlocale(LC_ALL, ""))
setlocale_failure = TRUE;
else {
#ifdef USE_LOCALE_CTYPE
curctype = setlocale(LC_CTYPE, Nullch);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
curcoll = setlocale(LC_COLLATE, Nullch);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
curnum = setlocale(LC_NUMERIC, Nullch);
#endif /* USE_LOCALE_NUMERIC */
}
#else /* !LC_ALL */
#ifdef USE_LOCALE_CTYPE
if (! (curctype = setlocale(LC_CTYPE, "")))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
if (! (curcoll = setlocale(LC_COLLATE, "")))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
if (! (curnum = setlocale(LC_NUMERIC, "")))
setlocale_failure = TRUE;
#endif /* USE_LOCALE_NUMERIC */
#endif /* LC_ALL */
#endif /* !LOCALE_ENVIRON_REQUIRED */
if (setlocale_failure) {
char *p;
bool locwarn = (printwarn > 1 ||
printwarn &&
(!(p = getenv("PERL_BADLANG")) || atoi(p)));
if (locwarn) {
#ifdef LC_ALL
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Setting locale failed.\n");
#else /* !LC_ALL */
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Setting locale failed for the categories:\n\t");
#ifdef USE_LOCALE_CTYPE
if (! curctype)
PerlIO_printf(PerlIO_stderr(), "LC_CTYPE ");
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
if (! curcoll)
PerlIO_printf(PerlIO_stderr(), "LC_COLLATE ");
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
if (! curnum)
PerlIO_printf(PerlIO_stderr(), "LC_NUMERIC ");
#endif /* USE_LOCALE_NUMERIC */
PerlIO_printf(PerlIO_stderr(), "\n");
#endif /* LC_ALL */
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Please check that your locale settings:\n");
PerlIO_printf(PerlIO_stderr(),
"\tLC_ALL = %c%s%c,\n",
lc_all ? '"' : '(',
lc_all ? lc_all : "unset",
lc_all ? '"' : ')');
{
char **e;
for (e = environ; *e; e++) {
if (strnEQ(*e, "LC_", 3)
&& strnNE(*e, "LC_ALL=", 7)
&& (p = strchr(*e, '=')))
PerlIO_printf(PerlIO_stderr(), "\t%.*s = \"%s\",\n",
(p - *e), *e, p + 1);
}
}
PerlIO_printf(PerlIO_stderr(),
"\tLANG = %c%s%c\n",
lang ? '"' : '(',
lang ? lang : "unset",
lang ? '"' : ')');
PerlIO_printf(PerlIO_stderr(),
" are supported and installed on your system.\n");
}
#ifdef LC_ALL
if (setlocale(LC_ALL, "C")) {
if (locwarn)
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Falling back to the standard locale (\"C\").\n");
ok = 0;
}
else {
if (locwarn)
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Failed to fall back to the standard locale (\"C\").\n");
ok = -1;
}
#else /* ! LC_ALL */
if (0
#ifdef USE_LOCALE_CTYPE
|| !(curctype || setlocale(LC_CTYPE, "C"))
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
|| !(curcoll || setlocale(LC_COLLATE, "C"))
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
|| !(curnum || setlocale(LC_NUMERIC, "C"))
#endif /* USE_LOCALE_NUMERIC */
)
{
if (locwarn)
PerlIO_printf(PerlIO_stderr(),
"perl: warning: Cannot fall back to the standard locale (\"C\").\n");
ok = -1;
}
#endif /* ! LC_ALL */
#ifdef USE_LOCALE_CTYPE
curctype = setlocale(LC_CTYPE, Nullch);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
curcoll = setlocale(LC_COLLATE, Nullch);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
curnum = setlocale(LC_NUMERIC, Nullch);
#endif /* USE_LOCALE_NUMERIC */
}
#ifdef USE_LOCALE_CTYPE
perl_new_ctype(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
perl_new_collate(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
perl_new_numeric(curnum);
#endif /* USE_LOCALE_NUMERIC */
#endif /* USE_LOCALE */
return ok;
}
/* Backwards compatibility. */
int
perl_init_i18nl14n(printwarn)
int printwarn;
{
return perl_init_i18nl10n(printwarn);
}
#ifdef USE_LOCALE_COLLATE
/*
* mem_collxfrm() is a bit like strxfrm() but with two important
* differences. First, it handles embedded NULs. Second, it allocates
* a bit more memory than needed for the transformed data itself.
* The real transformed data begins at offset sizeof(collationix).
* Please see sv_collxfrm() to see how this is used.
*/
char *
mem_collxfrm(s, len, xlen)
const char *s;
STRLEN len;
STRLEN *xlen;
{
char *xbuf;
STRLEN xalloc, xin, xout;
/* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
/* the +1 is for the terminating NUL. */
xalloc = sizeof(collation_ix) + collxfrm_base + (collxfrm_mult * len) + 1;
New(171, xbuf, xalloc, char);
if (! xbuf)
goto bad;
*(U32*)xbuf = collation_ix;
xout = sizeof(collation_ix);
for (xin = 0; xin < len; ) {
SSize_t xused;
for (;;) {
xused = strxfrm(xbuf + xout, s + xin, xalloc - xout);
if (xused == -1)
goto bad;
if (xused < xalloc - xout)
break;
xalloc = (2 * xalloc) + 1;
Renew(xbuf, xalloc, char);
if (! xbuf)
goto bad;
}
xin += strlen(s + xin) + 1;
xout += xused;
/* Embedded NULs are understood but silently skipped
* because they make no sense in locale collation. */
}
xbuf[xout] = '\0';
*xlen = xout - sizeof(collation_ix);
return xbuf;
bad:
Safefree(xbuf);
*xlen = 0;
return NULL;
}
#endif /* USE_LOCALE_COLLATE */
void
fbm_compile(sv)
SV *sv;
{
register unsigned char *s;
register unsigned char *table;
register U32 i;
register U32 len = SvCUR(sv);
I32 rarest = 0;
U32 frequency = 256;
if (len > 255)
return; /* can't have offsets that big */
Sv_Grow(sv,len+258);
table = (unsigned char*)(SvPVX(sv) + len + 1);
s = table - 2;
for (i = 0; i < 256; i++) {
table[i] = len;
}
i = 0;
while (s >= (unsigned char*)(SvPVX(sv)))
{
if (table[*s] == len)
table[*s] = i;
s--,i++;
}
sv_upgrade(sv, SVt_PVBM);
sv_magic(sv, Nullsv, 'B', Nullch, 0); /* deep magic */
SvVALID_on(sv);
s = (unsigned char*)(SvPVX(sv)); /* deeper magic */
for (i = 0; i < len; i++) {
if (freq[s[i]] < frequency) {
rarest = i;
frequency = freq[s[i]];
}
}
BmRARE(sv) = s[rarest];
BmPREVIOUS(sv) = rarest;
DEBUG_r(PerlIO_printf(Perl_debug_log, "rarest char %c at %d\n",BmRARE(sv),BmPREVIOUS(sv)));
}
char *
fbm_instr(big, bigend, littlestr)
unsigned char *big;
register unsigned char *bigend;
SV *littlestr;
{
register unsigned char *s;
register I32 tmp;
register I32 littlelen;
register unsigned char *little;
register unsigned char *table;
register unsigned char *olds;
register unsigned char *oldlittle;
if (SvTYPE(littlestr) != SVt_PVBM || !SvVALID(littlestr)) {
STRLEN len;
char *l = SvPV(littlestr,len);
if (!len)
return (char*)big;
return ninstr((char*)big,(char*)bigend, l, l + len);
}
littlelen = SvCUR(littlestr);
if (SvTAIL(littlestr) && !multiline) { /* tail anchored? */
if (littlelen > bigend - big)
return Nullch;
little = (unsigned char*)SvPVX(littlestr);
s = bigend - littlelen;
if (*s == *little && memEQ((char*)s,(char*)little,littlelen))
return (char*)s; /* how sweet it is */
else if (bigend[-1] == '\n' && little[littlelen-1] != '\n'
&& s > big) {
s--;
if (*s == *little && memEQ((char*)s,(char*)little,littlelen))
return (char*)s;
}
return Nullch;
}
table = (unsigned char*)(SvPVX(littlestr) + littlelen + 1);
if (--littlelen >= bigend - big)
return Nullch;
s = big + littlelen;
oldlittle = little = table - 2;
if (s < bigend) {
top2:
/*SUPPRESS 560*/
if (tmp = table[*s]) {
#ifdef POINTERRIGOR
if (bigend - s > tmp) {
s += tmp;
goto top2;
}
#else
if ((s += tmp) < bigend)
goto top2;
#endif
return Nullch;
}
else {
tmp = littlelen; /* less expensive than calling strncmp() */
olds = s;
while (tmp--) {
if (*--s == *--little)
continue;
s = olds + 1; /* here we pay the price for failure */
little = oldlittle;
if (s < bigend) /* fake up continue to outer loop */
goto top2;
return Nullch;
}
return (char *)s;
}
}
return Nullch;
}
char *
screaminstr(bigstr, littlestr)
SV *bigstr;
SV *littlestr;
{
register unsigned char *s, *x;
register unsigned char *big;
register I32 pos;
register I32 previous;
register I32 first;
register unsigned char *little;
register unsigned char *bigend;
register unsigned char *littleend;
if ((pos = screamfirst[BmRARE(littlestr)]) < 0)
return Nullch;
little = (unsigned char *)(SvPVX(littlestr));
littleend = little + SvCUR(littlestr);
first = *little++;
previous = BmPREVIOUS(littlestr);
big = (unsigned char *)(SvPVX(bigstr));
bigend = big + SvCUR(bigstr);
while (pos < previous) {
if (!(pos += screamnext[pos]))
return Nullch;
}
#ifdef POINTERRIGOR
do {
if (big[pos-previous] != first)
continue;
for (x=big+pos+1-previous,s=little; s < littleend; /**/ ) {
if (x >= bigend)
return Nullch;
if (*s++ != *x++) {
s--;
break;
}
}
if (s == littleend)
return (char *)(big+pos-previous);
} while ( pos += screamnext[pos] );
#else /* !POINTERRIGOR */
big -= previous;
do {
if (big[pos] != first)
continue;