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