strstr函数的用法_c find函数返回值_strchr函数(3)

int strncasecmp(const char *s1, const char *s2, size_t n);

* DESCRIPTION

The strcasecmp() function compares the two strings s1 and s2,

ignoring the case of the characters. // 忽略字母的大小写， (重点，与上面函数的区别)

It returns an integer less than, equal to, or greater than zero

if s1 is found, respectively, to be less than, to match, or be greater than s2.

The strncasecmp() function is similar, except it only compares the first n characters of s1.

*RETURN VALUE

The strcasecmp() and strncasecmp() functions return an integer less than,

equal to, or greater than zero if s1 (or the first n bytes thereof) is found,

respectively,to be less than, to match, or be greater than s2.

*/

retval = strcasecmp( psrc, pdst);
    printf("[%s]-[%d]: retval = %d \n", __func__, __LINE__, retval);

    retval = strncasecmp( psrc, pdst, sSrcLen);
    printf("[%s]-[%d]: retval = %d \n", __func__, __LINE__, retval);

    return 0;
}

2 strstr, strcasestr

在源字串中寻找子字符串，一个对大小写敏感，前面函数对大小写不敏感

int main (void )
{
    
    const char *pSrc = "HelloworldComeon!";
//  const char *pDst = "heLLo";
//  const char *pDst = "WoRld";
    const char *pDst = "come";

/* NAME

strstr, strcasestr - locate a substring

* SYNOPSIS

#include <string.h>

char *strstr(const char *haystack, const char *needle);

#define _GNU_SOURCE

#include <string.h>

char *strcasestr(const char *haystack, const char *needle);

* DESCRIPTION

The strstr() function finds the first occurrence of the substring needle in the string haystack.

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