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58 lines
1020 B
C
58 lines
1020 B
C
/*
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rexp4.c
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copyright 2024 Thomas E. Dickey
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This is a source file for mawk, an implementation of
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the AWK programming language.
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Mawk is distributed without warranty under the terms of
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the GNU General Public License, version 2, 1991.
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*/
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/*
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* $MawkId: rexp4.c,v 1.12 2024/09/05 17:44:48 tom Exp $
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*/
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#include <field.h>
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char *
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is_string_split(PTR q, size_t *lenp)
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{
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if (q != NULL) {
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STRING *s = ((RE_NODE *) q)->sval;
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char *result = s->str;
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/* if we have only one character, it cannot be a regex */
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if (s->len == 1) {
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*lenp = s->len;
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return result;
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} else {
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size_t n;
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for (n = 0; n < s->len; ++n) {
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/* if we have a meta character, it probably is a regex */
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switch (result[n]) {
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case '\\':
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case '$':
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case '(':
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case ')':
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case '*':
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case '+':
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case '.':
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case '?':
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case '[':
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case ']':
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case '^':
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case '|':
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#ifndef NO_INTERVAL_EXPR
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case L_CURL:
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case R_CURL:
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#endif
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return NULL;
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}
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}
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*lenp = s->len;
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return result;
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}
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}
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return NULL;
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}
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