archie/prospero/lib/pfs/sindex.c
2024-05-27 16:13:40 +02:00

46 lines
1.1 KiB
C

/*
* Copyright (c) 1991-1994 by the University of Southern California
*
* For copying and distribution information, please see the file
* <usc-license.h>.
*/
#include <usc-license.h>
#include <stdio.h>
#include <string.h>
#include <pmachine.h>
#include <pfs.h>
/*
* sindex - Find first instance of string 2 in string 1
*
* SINDEX scans string 1 for the first instance of string
* 2. If found, SINDEX returns a pointer to the first
* character of that instance. If no instance is found,
* SINDEX returns NULL (0).
*
* ARGS: s1 - string to be searched
* s2 - string to be found
* RETURNS: First instance of s2 in s1, or NULL (0) if not found
*/
const char *
sindex(const char *s1 /* String to be searched */,
const char *s2 /* String to be found */)
{
const char *s = s1; /* Temp pointer to string */
/* Check for first character of s2 */
while((s = strchr(s,*s2)) != NULL) {
if(strncmp(s,s2,strlen(s2)) == 0)
return(s);
s++;
}
/* We didn't find it */
return(NULL);
}