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strdup(3)               Library Functions Manual               strdup(3)

ИМЯ

       strdup, strndup, strdupa, strndupa - duplicate a string

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <string.h>

       char *strdup(const char *s);

       char *strndup(const char s[.n], size_t n);
       char *strdupa(const char *s);
       char *strndupa(const char s[.n], size_t n);

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

       strdup():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
               || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

       strndup():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

       strdupa(), strndupa():
           _GNU_SOURCE

ОПИСАНИЕ

       The strdup() function returns a pointer to a new string which is
       a duplicate of the string s.  Memory for the new string is
       obtained with malloc(3), and can be freed with free(3).

       The strndup() function is similar, but copies at most n bytes.
       If s is longer than n, only n bytes are copied, and a terminating
       null byte ('\0') is added.

       strdupa() and strndupa() are similar, but use alloca(3) to
       allocate the buffer.

ЗНАЧЕНИЕ, ВОЗВРАЩАЕМОЕ ФУНКЦИЕЙ

       On success, the strdup() function returns a pointer to the
       duplicated string.  It returns NULL if insufficient memory was
       available, with errno set to indicate the error.

ОШИБКИ

       ENOMEM Insufficient memory available to allocate duplicate
              string.

АТРИБУТЫ

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

СТАНДАРТЫ

       strdup()
       strndup()
              POSIX.1-2008.

       strdupa()
       strndupa()
              GNU.

ИСТОРИЯ

       strdup()
              SVr4, 4.3BSD-Reno, POSIX.1-2001.

       strndup()
              POSIX.1-2008.

       strdupa()
       strndupa()
              GNU.

СМОТРИТЕ ТАКЖЕ

       alloca(3), calloc(3), free(3), malloc(3), realloc(3), string(3),
       wcsdup(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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       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-06-15                      strdup(3)

Страницы, ссылающиеся на эту страницу: alloca(3), ldap_memory(3), pmdadaemon(3), pmdafetch(3), pmfault(3), pmtraversepmns(3), strcpy(3), string(3), wcsdup(3), string_copying(7)