πΎ Archived View for gmi.noulin.net βΊ man βΊ man3 βΊ strdup.3.gmi captured on 2024-08-31 at 14:18:41. Gemini links have been rewritten to link to archived content
β¬ οΈ Previous capture (2022-06-12)
-=-=-=-=-=-=-
STRDUP(3) Linux Programmer's Manual STRDUP(3) NAME strdup, strndup, strdupa, strndupa - duplicate a string SYNOPSIS #include <string.h> char *strdup(const char *s); char *strndup(const char *s, size_t n); char *strdupa(const char *s); char *strndupa(const char *s, 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 DESCRIPTION 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. They are available only when using the GNU GCC suite, and suffer from the same limitations described in alloca(3). RETURN VALUE 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. ERRORS ENOMEM Insufficient memory available to allocate duplicate string. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββ€ βstrdup(), strndup(), strdupa(), strndupa() β Thread safety β MT-Safe β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββ CONFORMING TO strdup() conforms to SVr4, 4.3BSD, POSIX.1-2001. strndup() conforms to POSIX.1-2008. strdupa() and strndupa() are GNU extensions. SEE ALSO alloca(3), calloc(3), free(3), malloc(3), realloc(3), string(3), wcsdup(3) GNU 2021-03-22 STRDUP(3)