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Fix an off-by-one error of own memrchr implementation

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and make it support `search_len == 0`, just for the case

Ref [Bug #20796]
This commit is contained in:
Yusuke Endoh 2024-10-21 18:25:09 +09:00
parent 257f78fb67
commit a83c91dd7a
Notes: git 2024-10-21 11:41:01 +00:00 
Merged: https://github.com/ruby/ruby/pull/11923
1 changed files with 2 additions and 2 deletions
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4
string.c
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@ -4548,9 +4548,9 @@ static void*
memrchr(const char *search_str, int chr, long search_len) memrchr(const char *search_str, int chr, long search_len)
{ {
const char *ptr = search_str + search_len; const char *ptr = search_str + search_len;
do { while (ptr > search_str) {
if ((unsigned char)*(--ptr) == chr) return (void *)ptr; if ((unsigned char)*(--ptr) == chr) return (void *)ptr;
} while (ptr >= search_str); }
return ((void *)0); return ((void *)0);
} }