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/*
* (c) Copyright 1990, Kim Fabricius Storm. All rights reserved.
*
* String/Subject matching routines.
*/
#include "config.h"
#include "regexp.h"
export int case_fold_search = 1;
#define MAXFOLD 256 /* max length of any string */
/*
* Systems which have a tolower(c) function which is defined for
* all characters, but no _tolower(c) macro which works for
* isupper(c) only, may define HAVE_GENERIC_TOLOWER -- it
* may give a slight speed-up, but is not mandatory.
*/
#ifndef HAVE_GENERIC_TOLOWER
#ifndef _tolower
#define _tolower(c) tolower(c)
#endif
#endif
void
fold_string(mask) /* convert mask to lower-case */
register char *mask;
{
register char c;
for ( ; (c = *mask); mask++) {
#ifdef _tolower
if (!isascii(c) || !isupper(c)) continue;
*mask = _tolower(c);
#else
*mask = tolower(c);
#endif
}
}
int
streq_fold(mask, str) /* mask is prefix of str - FOLD */
register char *mask, *str;
{
register char c = 0, d;
while ((d = *mask++)) {
if ((c = *str++) == NUL) return 0;
if (c == d) continue;
#ifdef _tolower
if (!isascii(c) || !isupper(c) || _tolower(c) != (unsigned)d) return 0;
#else
if (tolower(c) != d) return 0;
#endif
}
return c == NUL ? 1 : 2;
}
int
strmatch_fold(mask, str) /* mask occurs anywhere in str - FOLD */
char *mask;
register char *str;
{
register char c, m1 = *mask++;
for (;;) {
while ((c = *str++)) { /* find first occ. of mask[0] in str. */
if (c == m1) break;
#ifdef _tolower
if (!isascii(c) || !isupper(c)) continue;
if (_tolower(c) == (unsigned)m1) break;
#else
if (tolower(c) == m1) break;
#endif
}
if (c == NUL) return 0;
if (streq_fold(mask, str)) return 1;
}
}
int
strmatch(mask, str) /* mask occurs anywhere in str - CASE */
char *mask;
register char *str;
{
register char *q, *m;
register char m1 = *mask;
for (; *str; str++) {
if (*str != m1) continue;
q = str; m = mask;
do
if (*++m == NUL) return 1;
while (*++q == *m);
}
return 0;
}
int
strmatch_cf(mask, str) /* fold if case_fold_search is set */
char *mask;
char *str;
{
if (case_fold_search)
return strmatch_fold(mask, str);
return strmatch(mask, str);
}
/*
* case insensitive regexp matching
*/
int regexec_fold(prog, string)
register regexp *prog;
char *string;
{
char buf[256];
register char c, *bp, *str, *maxb;
bp = buf, maxb = &buf[255];
str = string;
while (bp < maxb && (c = *str++) != NUL)
#ifdef _tolower
*bp++ = (!isascii(c) || !isupper(c)) ? c : _tolower(c);
#else
*bp++ = tolower(c);
#endif
*bp = NUL;
if (!regexec(prog, buf)) return 0;
prog->startp[0] = string + (prog->startp[0] - buf);
prog->endp[0] = string + (prog->endp[0] - buf);
return 1;
}
int regexec_cf(prog, string)
register regexp *prog;
char *string;
{
if (case_fold_search)
return regexec_fold(prog, string);
return regexec(prog, string);
}
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