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MemChr.c
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MemChr.c
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/*++
toro C Library
https://github.com/KilianKegel/toro-C-Library#toro-c-library-formerly-known-as-torito-c-library
Copyright (c) 2017-2024, Kilian Kegel. All rights reserved.
SPDX-License-Identifier: GNU General Public License v3.0
Module Name:
MemChr.c
Abstract:
Implementation of the Standard C function.
Find characters in a buffer.
Author:
Kilian Kegel
--*/
#include <CdeServices.h>
/**
Synopsis
#include <string.h>
void *memchr(const void *s, int c, size_t n);
Description
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/memchr-wmemchr?view=msvc-160
The memchr function locates the first occurrence of c (converted to an unsigned
char) in the initial n characters (each interpreted as unsigned char) of the object
pointed to by s.
Returns
The memchr function returns a pointer to the located character, or a null pointer if the
character does not occur in the object.
**/
void* memchr(const void* str, int c, size_t n) {
unsigned char u = (unsigned char)c;
unsigned char* pRet = (unsigned char*)str;
while (n) {
if (*pRet == u)
break;
n--;
pRet++;
}
return n == 0 ? NULL : pRet;
}