/* Function must return either 0 or 1 (assumed by code for 0x80|'!') */
static int
do_gmatch(const unsigned char *s, const unsigned char *se,
const unsigned char *p, const unsigned char *pe)
{
int sc, pc;
const unsigned char *prest, *psub, *pnext;
const unsigned char *srest;
if (s == NULL || p == NULL)
return 0;
while (p < pe) {
pc = *p++;
sc = s < se ? *s : '\0';
s++;
if (!ISMAGIC(pc)) {
if (sc != pc)
return 0;
continue;
}
switch (*p++) {
case '[':
if (sc == 0 || (p = cclass(p, sc)) == NULL)
return 0;
break;
case '?':
if (sc == 0)
return 0;
break;
case '*':
if (p == pe)
return 1;
s--;
do {
if (do_gmatch(s, se, p, pe))
return 1;
} while (s++ < se);
return 0;
/*
* [*+?@!](pattern|pattern|..)
*
* Not ifdef'd KSH as this is needed for ${..%..}, etc.
*/
case 0x80|'+': /* matches one or more times */
case 0x80|'*': /* matches zero or more times */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
/* take care of zero matches */
if (p[-1] == (0x80 | '*') &&
do_gmatch(s, se, prest, pe))
return 1;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
for (srest = s; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2) &&
(do_gmatch(srest, se, prest, pe) ||
(s != srest && do_gmatch(srest,
se, p - 2, pe))))
return 1;
}
if (pnext == prest)
break;
}
return 0;
case 0x80|'?': /* matches zero or once */
case 0x80|'@': /* matches one of the patterns */
case 0x80|' ': /* simile for @ */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
/* Take care of zero matches */
if (p[-1] == (0x80 | '?') &&
do_gmatch(s, se, prest, pe))
return 1;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
srest = prest == pe ? se : s;
for (; srest <= se; srest++) {
if (do_gmatch(s, srest, psub, pnext - 2) &&
do_gmatch(srest, se, prest, pe))
return 1;
}
if (pnext == prest)
break;
}
return 0;
case 0x80|'!': /* matches none of the patterns */
if (!(prest = pat_scan(p, pe, 0)))
return 0;
s--;
for (srest = s; srest <= se; srest++) {
int matched = 0;
for (psub = p; ; psub = pnext) {
pnext = pat_scan(psub, pe, 1);
if (do_gmatch(s, srest, psub,
pnext - 2))
{
matched = 1;
break;
}
if (pnext == prest)
break;
}
if (!matched &&
do_gmatch(srest, se, prest, pe))
return 1;
}
return 0;
default:
if (sc != p[-1])
return 0;
break;
}
}
return s == se;
}
/**
* pattern simplifications:
* - @(x) -> x (not @(x|y) though)
* - ** -> *
*/
static void *
simplify_gmatch_pattern(const unsigned char *sp)
{
uint8_t c;
unsigned char *cp, *dp;
const unsigned char *ps, *se;
cp = alloc(strlen((const void *)sp) + 1, ATEMP);
goto simplify_gmatch_pat1a;
/* foo@(b@(a)r)b@(a|a)z -> foobarb@(a|a)z */
simplify_gmatch_pat1:
sp = cp;
simplify_gmatch_pat1a:
dp = cp;
se = sp + strlen((const void *)sp);
while ((c = *sp++)) {
if (!ISMAGIC(c)) {
*dp++ = c;
continue;
}
switch ((c = *sp++)) {
case 0x80|'@':
/* simile for @ */
case 0x80|' ':
/* check whether it has only one clause */
ps = pat_scan(sp, se, true);
if (!ps || ps[-1] != /*(*/ ')')
/* nope */
break;
/* copy inner clause until matching close */
ps -= 2;
while ((const unsigned char *)sp < ps)
*dp++ = *sp++;
/* skip MAGIC and closing parenthesis */
sp += 2;
/* copy the rest of the pattern */
memmove(dp, sp, strlen((const void *)sp) + 1);
/* redo from start */
goto simplify_gmatch_pat1;
}
*dp++ = MAGIC;
*dp++ = c;
}
*dp = '\0';
/* collapse adjacent asterisk wildcards */
sp = dp = cp;
while ((c = *sp++)) {
if (!ISMAGIC(c)) {
*dp++ = c;
continue;
}
switch ((c = *sp++)) {
case '*':
while (ISMAGIC(sp[0]) && sp[1] == c)
sp += 2;
break;
}
*dp++ = MAGIC;
*dp++ = c;
}
*dp = '\0';
/* return the result, allocated from ATEMP */
return (cp);
}
