Ubuntu Manpages

memchr, memrchr

scan memory for a character

Standard C library (libc, -lc)

#include <string.h>
void *memchr(size_t n;
             const void s[n], int c, size_t n);
void *memrchr(size_t n;
             const void s[n], int c, size_t n);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

memrchr():

    _GNU_SOURCE

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 memchr() and memrchr() functions return a pointer to the matching byte or NULL if the character does not occur in the given memory area.

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
memchr (), memrchr () Thread safety MT-Safe

C11, POSIX.1-2008.
GNU.

POSIX.1-2001, C89, SVr4, 4.3BSD.
glibc 2.2.

bstring(3), ffs(3), memmem(3), strchr(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), wmemchr(3)