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MEMCHR(3) Library Functions Manual MEMCHR(3)

memchr, memrchr
locate byte in byte string

#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.

strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), wmemchr(3)

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.
April 7, 2014 OpenBSD-current