我要评论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
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