memchr(3) — Справочная страница Linux

memchr(3)               Library Functions Manual               memchr(3)

ИМЯ

       memchr, memrchr, rawmemchr - scan memory for a character

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #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)):

       memrchr(), rawmemchr():
           _GNU_SOURCE

ОПИСАНИЕ

       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.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       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.

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

АТРИБУТЫ

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

СТАНДАРТЫ

       memchr()
              C11, POSIX.1-2008.

       memrchr()
       rawmemchr()
              GNU.

ИСТОРИЯ

       memchr()
              POSIX.1-2001, C89, SVr4, 4.3BSD.

       memrchr()
              glibc 2.2.

       rawmemchr()
              glibc 2.1.

СМОТРИТЕ ТАКЖЕ

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

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
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       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                      memchr(3)

Страницы, которые ссылаются на эту страницу: bstring(3), ffs(3), memchr(3), strchr(3), strpbrk(3), strsep(3), strspn(3), strstr(3), strtok(3), wmemchr(3), signal-safety(7)