memchr(3) [netbsd man page]
MEMCHR(3) BSD Library Functions Manual MEMCHR(3) NAME
memchr, memrchr -- 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 locates the last occurrence of c (converted to an unsigned char) 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
index(3), rindex(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), strtok(3) STANDARDS
The memchr() function conforms to ANSI X3.159-1989 (``ANSI C89''). BSD
April 10, 2009 BSD
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MEMCHR(3) Linux Programmer's Manual MEMCHR(3) 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)): memrchr(), 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 (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, '