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)):
The memchr() function scans the initial
n bytes of the memory area pointed to by
s for the first instance of
c and the bytes of the memory area pointed to by
s are interpreted as
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, '\0');
For an explanation of the terms used in this section, see attributes(7).
|memchr(), memrchr(), rawmemchr()||Thread safety||MT-Safe|
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