NAME

strdup, strndup — save a copy of a string

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <string.h>

char *
strdup(const char *str);

char *
strndup(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 pointer may subsequently be used as an argument to the function free(3).

If insufficient memory is available, NULL is returned and errno is set to ENOMEM.

The strndup() function copies at most len characters from the string str always NUL terminating the copied string.

SEE ALSO

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”).

HISTORY

The strdup() function first appeared in 4.4BSD. The strndup() function was added in FreeBSD 7.2.