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    Command:

    strdup

    
    
    

    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():
               _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
               _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
               || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
           strndup():
               Since glibc 2.10:
                   _POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700
               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 suf-
           fer 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 cause of the error.
    
    
    

    ERRORS

           ENOMEM Insufficient memory available to allocate duplicate string.
    
    
    

    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), wcs-
           dup(3)
    
    
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