phpstrncmp函数原型源码分析

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strncmp

函数原型

源码分析 版本PHP 5.6.40

1、Zend/zend_builtin_functions.c (内置函数)

ZEND_FUNCTION(strncmp){char *s1, *s2;int s1_len, s2_len;long len;if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ssl", &s1, &s1_len, &s2, &s2_len, &len) == FAILURE) {return;}if (len < 0) {zend_error(E_WARNING, "Length must be greater than or equal to 0");RETURN_FALSE;}RETURN_LONG(zend_binary_strncmp(s1, s1_len, s2, s2_len, len));}

2、Zend/zend_operators.c

ZEND_API int zend_binary_strncmp(const char *s1, uint len1, const char *s2, uint len2, uint length) /* {{{ */{int retval;if (s1 == s2) {return 0;}retval = memcmp(s1, s2, MIN(length, MIN(len1, len2)));if (!retval) {return (MIN(length, len1) - MIN(length, len2));} else {return retval;}}

3、memcmp 用法