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# This patch fixes a problem in the replace() function; the original code
# relies on broken behavior found in some older versions of the libc
# strstr() function, where passing in an empty string ("", not null)
# resulted in getting back a null (no match) rather than a pointer to the
# base of the original string (match the first 'empty sequence' should
# always trigger at the start of the string in PCREs).
--- src/expr.c.orig 2005-10-17 12:19:50.766595686 -0600
+++ src/expr.c 2005-10-17 12:21:01.725322349 -0600
@@ -1359,7 +1359,7 @@
constr = opdstr(1);
Sstr2 = Stringnew(NULL, -1, constr->attrs);
start = constr->data;
- while ((next = strstr(start, old->data))) {
+ while (old->len && (next = strstr(start, old->data))) {
SStringoncat(Sstr2, constr, start - constr->data, next - start);
SStringcat(Sstr2, new);
start = next + old->len;
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