Bug #66777 [Asn->Opn]: strftime returns empty string when input fmt string exceeds 1024

Edit report at https://bugs.php.net/bug.php?id=66777&edit=1 ID: 66777 Updated by: kalle@php.net Reported by: csyangchen at hotmail dot com Summary: strftime returns empty string when input fmt string exceeds 1024 -Status: Assigned +Status: Open Type: Bug Package: Date/time related PHP Version: Irrelevant -Assigned To: derick +Assigned To: Block user comment: N Private report: N Previous Comments: ------------------------------------------------------------------------ [2014-02-26 03:55:44] csyangchen at hotmail dot com Description: ------------ strftime returns empty string when input fmt string exceeds 1024 due to the undocumented code logic in 'ext/date/php_date.c' php_strftime ... int max_reallocs = 5; size_t buf_len = 256, real_len; ... buf = (char *) emalloc(buf_len); while ((real_len=strftime(buf, buf_len, format, &ta))==buf_len || real_len==0) { buf_len *= 2; buf = (char *) erealloc(buf, buf_len); if (!--max_reallocs) { break; } } ... the logic to abort reallocation after 5 times is undocumented. thus we can have at most 256 * 5 = 1024 size string. Test script: --------------- echo strftime(str_repeat('x', 1024)); Expected result: ---------------- should output 1024 occurrences of 'x' Actual result: -------------- empty string ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=66777&edit=1