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浅谈strstr()实现
阅读量:278 次
发布时间:2019-03-01

本文共 498 字,大约阅读时间需要 1 分钟。

strstr 字符串匹配

strstr 字符串匹配功能描述

在第一个字符串中查找与第二个字符串完全相同的子串,如果存在,则返回第一个字符串中该子串的首地址。

该函数通过逐字符比较的方式实现匹配,确保两个字符串在相同位置上字符完全一致。如果匹配成功,返回第一个字符串中子串起始位置的指针;如果未找到匹配项,则返回NULL。

函数实现代码

char* my_strstr(char* str, char* sub) {	while (*str) {		if (*str != *sub) {			str++;		} else {			char* stri = str;			char* subi = sub;			while (*subi && *stri == *subi && *stri) {				subi++;				stri++;			}			if (*stri == '\0') {				return NULL;			}			if (*subi == '\0') {				return str;			} else {				str++;			}		}	}	return NULL;}

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