memrchr (3) - Linux Man Pages
memrchr: scan memory for a character
memchr, memrchr, rawmemchr - scan memory for a character
#include <string.h> void *memchr(const void *s, int c, size_t n); void *memrchr(const void *s, int c, size_t n); void *rawmemchr(const void *s, int c);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONThe 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(): 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, and so performs an optimized search for c (i.e., no use of a count argument to limit the range of the search). If an instance of c is not found, the results are unpredictable. The following call is a fast means of locating a string's terminating null byte:
char *p = rawmemchr(s,
function is a GNU extension, available since glibc 2.1.91.
functions return a pointer
to the matching byte or NULL if the character does not occur in
the given memory area.
first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see
Interface Attribute Value
Thread safety MT-Safe
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
This page is part of release 4.15 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
The memrchr() function is a GNU extension, available since glibc 2.1.91.
Linux man pages generated by: SysTutorials