Man page - memrchr(3)

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Manual

memchr

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

memchr, memrchr, rawmemchr - scan memory for a character

LIBRARY

Standard C library ( libc , -lc )

SYNOPSIS

#include <string.h>

void *memchr(const void s [. n ], int c , size_t n );
void *memrchr(const void s [. n ], int c , size_t n );

[[deprecated]] void *rawmemchr(const void * s , int c );

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

memrchr (), rawmemchr ():
_GNU_SOURCE

DESCRIPTION

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.

RETURN VALUE

The memchr () and memrchr () functions return a pointer to the matching byte or NULL if the character does not occur in the given memory area.

The rawmemchr () function returns a pointer to the matching byte.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

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STANDARDS

memchr ()

C11, POSIX.1-2008.

memrchr ()
rawmemchr ()

GNU.

HISTORY

memchr ()

POSIX.1-2001, C89, SVr4, 4.3BSD.

memrchr ()

glibc 2.2.

rawmemchr ()

glibc 2.1.

SEE ALSO

bstring (3), ffs (3), memmem (3), strchr (3), strpbrk (3), strrchr (3), strsep (3), strspn (3), strstr (3), wmemchr (3)