memchr, memrchr, rawmemchr - scan memory for a character
Standard C library (libc, -lc)
#include <string.h>
void *memchr(const void s[.n], int c, size_t n);
void *memrchr(const void s[.n], int c, size_t n);
[[deprecated]] 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. 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(), but 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. If an instance
of c is not found, the behavior is undefined. Use either
strlen(3) or memchr(3) instead.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| Thread safety | MT-Safe |