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STRDUP(3) Library Functions Manual STRDUP(3) NAME strdup, strdupa, strndup, strndupa -- save a copy of a string LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <string.h> char * strdup(const char *str); char * strdupa(const char *str); char * strndup(const char *str, size_t len); char * strndupa(const char *str, size_t len); DESCRIPTION The strdup() function allocates sufficient memory for a copy of the string str, does the copy, and returns a pointer to it. The memory is allocated with malloc(3) and should be released with free(3) when no longer needed. The strndup() function copies at most len characters from the string str always NUL terminating the copied string. The strdupa() function is identical to strdup() but allocates the memory with alloca(3). Similarly, the strndupa() function is identical to strndup(), but allocates the memory with alloca(3). RETURN VALUES If insufficient memory is available, NULL is returned and errno is set to ENOMEM. Otherwise, the strdup() family of functions return a pointer to the copied string. SEE ALSO alloca(3), free(3), malloc(3), wcsdup(3) STANDARDS The strdup() function is specified by IEEE Std 1003.1-2001 ("POSIX.1"). The strndup() function is specified by IEEE Std 1003.1-2008 ("POSIX.1"). The strdupa() and strndupa() functions are extensions, taken from glibc. HISTORY The strdup() function first appeared in 4.3BSD-Reno. The strndup() func- tion was added in FreeBSD 7.2. The strdupa() and strndupa() functions were added in FreeBSD 15.1. FreeBSD ports 15.quarterly May 5, 2020 STRDUP(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | STANDARDS | HISTORY
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