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https://codeberg.org/grunfink/snac2.git
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72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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/* copyright (c) 2022 - 2023 grunfink et al. / MIT license */
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#ifndef _XS_MATCH_H
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#define _XS_MATCH_H
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/* spec is very similar to shell file globbing:
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an * matches anything;
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a ? matches any character;
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| select alternative strings to match;
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a \\ escapes a special character;
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any other char matches itself. */
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int xs_match(const char *str, const char *spec);
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#ifdef XS_IMPLEMENTATION
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int xs_match(const char *str, const char *spec)
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{
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const char *o_str = str;
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again:
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if (*spec == '*') {
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spec++; /* wildcard */
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do {
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if (xs_match(str, spec))
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return 1;
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str++;
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} while (*str);
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return 0;
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}
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if (*spec == '?' && *str) {
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spec++; /* any character */
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str++;
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goto again;
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}
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if (*spec == '|')
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return 1; /* alternative separator? positive match */
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if (!*spec)
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return 1; /* end of spec? positive match */
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if (*spec == '\\')
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spec++; /* escaped char */
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if (*spec == *str) {
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spec++; /* matched 1 char */
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str++;
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goto again;
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}
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/* not matched; are there any alternatives? */
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while (*spec) {
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if (*spec == '|')
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return xs_match(o_str, spec + 1); /* try next alternative */
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if (*spec == '\\')
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spec++; /* escaped char */
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spec++;
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}
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return 0;
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* XS_MATCH_H */
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