memchr(3)

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Options · 5

memchr()	C11, POSIX.1-2008.
rawmemchr()	GNU.
memchr()	POSIX.1-2001, C89, SVr4, 4.3BSD.
memrchr()	glibc 2.2.
rawmemchr()	glibc 2.1.

NAME

memchr, memrchr, rawmemchr - scan memory for a character

SYNOPSIS

bash

#include <string.h>

bash

void *memchr(const void \ns\n[.\nn\n], int \nc\n, size_t \nn\n);\n
\nvoid *memrchr(const void \ns\n[.\nn\n], int \nc\n, size_t \nn\n);

bash

[[deprecated]] void *rawmemchr(const void *\ns\n, int \nc\n);

memrchr(), rawmemchr():

bash


\n
    _GNU_SOURCE

The memchr() function scans the initial n bytes of the memory area pointed to by s for the first instance of c. Both c and the bytes of the memory area pointed to by s are interpreted as unsigned char.

The memrchr() function is like the memchr() function, except that it searches backward from the end of the n bytes pointed to by s instead of forward from the beginning.

The rawmemchr() function is similar to memchr(), but it assumes (i.e., the programmer knows for certain) that an instance of c lies somewhere in the memory area starting at the location pointed to by s. If an instance of c is not found, the behavior is undefined. Use either strlen(3) or memchr(3) instead.