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FreeBSD 11.0 - man page for memrchr (freebsd section 3)

MEMCHR(3)						   BSD Library Functions Manual 						 MEMCHR(3)

NAME
memchr -- locate byte in byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h> void * memchr(const void *b, int c, size_t len); void * memrchr(const void *b, int c, size_t len);
DESCRIPTION
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.
RETURN VALUES
The memchr() and memrchr() functions return a pointer to the byte located, or NULL if no such byte exists within len bytes.
SEE ALSO
memmem(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3), wmemchr(3)
STANDARDS
The memchr() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The memrchr() function is a GNU extension and conforms to no standard.
HISTORY
The memrchr() function first appeared in GNU libc 2.1.91, this implementation first appeared in FreeBSD 6.4, coming from OpenBSD 4.3.
BSD
April 9, 2008 BSD