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Manual Pages  — STRDUP


strdup, strndup – save a copy of a string



Standard C Library (libc, -lc)


#include <string.h>

char *
strdup(const char *str);

char *
strndup(const char *str, size_t len);


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.


free(3), malloc(3), wcsdup(3)


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

STRDUP (3) June 6, 2018

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