rawmemchr(3) — Linux manual page

rawmemchr(3)             Library Functions Manual            rawmemchr(3)

NAME         top

       rawmemchr - memory raw search character

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #define _GNU_SOURCE  /* See feature_test_macros(7) */
       #include <string.h>

       [[deprecated]] void *rawmemchr(const void *s, int c);

DESCRIPTION         top

       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.

RETURN VALUE         top

       The rawmemchr() function returns a pointer to the matching byte.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                            │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │ rawmemchr()                          │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS         top

       GNU.

HISTORY         top

       glibc 2.1.

SEE ALSO         top

       memchr(3), strlen(3), strnul(3)

COLOPHON         top

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Linux man-pages 6.18            2026-02-25                   rawmemchr(3)

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