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MEMCHR(3)		   Linux Programmer's Manual		     MEMCHR(3)

       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)):

       rawmemchr(): _GNU_SOURCE

       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 (inter‐
       preted 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	 argu‐
       ment,  n, to limit the range of the search).  If the character c is not
       in the string s, then rawmemchr() may proceed 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, '\0');

       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.

       rawmemchr() first appeared in glibc in version 2.1.

       memrchr() first appeared in glibc in version 2.2.

       The memchr() function conforms to SVr4, 4.3BSD, C89, C99, POSIX.1-2001.

       The memrchr() function  is  a  GNU  extension,  available  since	 glibc

       The rawmemchr() function is a GNU extension, available since glibc 2.1.

       ffs(3),	 index(3),   rindex(3),	  strchr(3),  strpbrk(3),  strrchr(3),
       strsep(3), strspn(3), strstr(3), wmemchr(3)

       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

				  2009-04-21			     MEMCHR(3)

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