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MEMCHR
Section: Linux Programmer's Manual (3)
Updated: 2008-07-09
Index
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NAME
memchr, memrchr, rawmemchr - scan memory for a character
SYNOPSIS
#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)):
rawmemchr():
_GNU_SOURCE
DESCRIPTION
The
memchr()
function scans the first n bytes of the memory
area pointed to by s for the character c.
The first byte to
match c (interpreted as an unsigned character) stops the operation.
The
memrchr()
function is like the
memchr()
function,
except that it searches backwards from the end of the n bytes
pointed to by s instead of forwards from the beginning.
The
rawmemchr()
function is similar to
memchr():
it assumes (i.e., the programmer knows for certain)
that the character
c
lies somewhere in the string
s,
and so performs an optimized search
for the character
c
(i.e., no checking for the terminating null byte, or use of an argument,
n,
to limit the range of the search).
If the chararacter
c
is not in the string
s,
then
rawmemchr()
may proceeed to search beyond the end of the string,
and the result is unspecified.
The folowing call is a fast means of locating a string's
terminating null byte:
char *p = rawmemchr(s, aq\0aq);
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.
The
rawmemchr()
function returns a pointer to the matching byte, if one is found.
If no matching byte is found, the result is unspecified.
CONFORMING TO
The
memchr()
function conforms to SVr4, 4.3BSD, C89, C99, POSIX.1-2001.
The
memrchr()
function is a GNU extension, available since glibc 2.1.91.
The
rawmemchr()
function is a GNU extension, available since glibc 2.1.
SEE ALSO
index(3),
rindex(3),
strchr(3),
strpbrk(3),
strrchr(3),
strsep(3),
strspn(3),
strstr(3),
wmemchr(3)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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