stristr.c：源码内容
/* +++Date last modified: 05-Jul-1997 */
/*
** Designation: StriStr
**
** Call syntax: char *stristr(char *String, char *Pattern)
**
** Description: This function is an ANSI version of strstr() with
** case insensitivity.
**
** Return item: char *pointer if Pattern is found in String, else
** pointer to 0
**
** Rev History: 07/04/95 Bob Stout ANSI-fy
** 02/03/94 Fred Cole Original
**
** Hereby donated to public domain.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "snip_str.h"
typedef unsigned int uint;
#if defined(__cplusplus) && __cplusplus
extern "C" {
#endif
char *stristr(const char *String, const char *Pattern)
{
char *pptr, *sptr, *start;
uint slen, plen;
for (start = (char *)String,
pptr = (char *)Pattern,
slen = strlen(String),
plen = strlen(Pattern);
/* while string length not shorter than pattern length */
slen >= plen;
start++, slen--)
{
/* find start of pattern in string */
while (toupper(*start) != toupper(*Pattern))
{
start++;
slen--;
/* if pattern longer than string */
if (slen < plen)
return(NULL);
}
sptr = start;
pptr = (char *)Pattern;
while (toupper(*sptr) == toupper(*pptr))
{
sptr++;
pptr++;
/* if end of pattern then pattern was found */
if ('' == *pptr)
return (start);
}
}
return(NULL);
}
#if defined(__cplusplus) && __cplusplus
}
#endif
#ifdef TEST
int main(void)
{
char buffer[80] = "heLLo, HELLO, hello, hELLo, HellO";
char *sptr = buffer;
while (0 != (sptr = stristr(sptr, "hello")))
printf("Found %5.5s!n", sptr++);
return(0);
}
#endif /* TEST */
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