NAME

memchr, memrchr —

locate byte in byte string

SYNOPSIS

#include <string.h>

void *
memchr(const void *b, int c, size_t len);

void *
memrchr(const void *b, int c, size_t len);

The memchr() function locates the first occurrence of c (converted to an

unsigned
  char

) in string b.

The memrchr() function behaves like memchr(), except that it locates the last occurrence of c in string b.

The memchr() and memrchr() functions return a pointer to the byte located, or NULL if no such byte exists within len bytes.

The memchr() function conforms to ANSI X3.159-1989 (“ANSI C89”).

The memrchr() function is an OpenBSD extension.

The memchr() function first appeared in AT&T System V UNIX and was reimplemented for 4.3BSD-Tahoe.