You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
60 lines
1.7 KiB
60 lines
1.7 KiB
/***
|
|
*memchr.c - search block of memory for a given character
|
|
*
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* defines memchr() - search memory until a character is
|
|
* found or a limit is reached.
|
|
*
|
|
*Revision History:
|
|
* 05-31-89 JCR C version created.
|
|
* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
|
|
* copyright.
|
|
* 08-14-90 SBM Compiles cleanly with -W3, removed now redundant
|
|
* #include <stddef.h>
|
|
* 10-01-90 GJF New-style function declarator. Also, rewrote expr. to
|
|
* avoid using cast as an lvalue.
|
|
* 04-26-91 SRW Removed level 3 warnings
|
|
* 09-01-93 GJF Replaced _CALLTYPE1 with __cdecl.
|
|
* 03-15-95 GJF Unified PMAC and Win32 versions, elimating bug in
|
|
* PMAC version in the process
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <string.h>
|
|
|
|
/***
|
|
*char *memchr(buf, chr, cnt) - search memory for given character.
|
|
*
|
|
*Purpose:
|
|
* Searches at buf for the given character, stopping when chr is
|
|
* first found or cnt bytes have been searched through.
|
|
*
|
|
*Entry:
|
|
* void *buf - memory buffer to be searched
|
|
* int chr - character to search for
|
|
* size_t cnt - max number of bytes to search
|
|
*
|
|
*Exit:
|
|
* returns pointer to first occurence of chr in buf
|
|
* returns NULL if chr not found in the first cnt bytes
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
void * __cdecl memchr (
|
|
const void * buf,
|
|
int chr,
|
|
size_t cnt
|
|
)
|
|
{
|
|
while ( cnt && (*(unsigned char *)buf != (unsigned char)chr) ) {
|
|
buf = (unsigned char *)buf + 1;
|
|
cnt--;
|
|
}
|
|
|
|
return(cnt ? (void *)buf : NULL);
|
|
}
|