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Add sanity check for "no previous regular expression" state,

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This commit is contained in:
Andrey A. Chernov 1994-09-14 22:25:15 +00:00
parent 28d8923ed0
commit a7f57b7141
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=2768
1 changed files with 4 additions and 1 deletions
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5
lib/libcompat/4.3/regex.c
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@ -59,8 +59,11 @@ char *
re_comp(s)
char *s;
{
if (s == NULL || *s == '\0')
if (s == NULL || *s == '\0') {
if (re_regexp == NULL)
return "no previous regular expression";
return (NULL);
}
if (re_regexp)
free(re_regexp);
if (re_errstr)