NAME

memchr, memrchr - scan memory for a character

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <string.h>

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

memrchr():

    _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.

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.

ATTRIBUTES

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

STANDARDS

memchr()

C11, POSIX.1-2008.

memrchr()

GNU.

HISTORY

memchr()

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

memrchr()

glibc 2.2.

SEE ALSO

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