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