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Name

strsep - extract token from string

Synopsis


#include <string.h>
char *strsep(char **stringp, const char *delim);

Feature Test Macro Requirements for glibc (see feature_test_macros(7) ):

strsep(): _BSD_SOURCE

Description

If *stringp is NULL, the strsep() function returns NULL and does nothing else. Otherwise, this function finds the first token in the string *stringp, that is delimited by one of the bytes in the string delim. This token is terminated by overwriting the delimiter with a null byte (aq\0aq), and *stringp is updated to point past the token. In case no delimiter was found, the token is taken to be the entire string *stringp, and *stringp is made NULL.

Return Value

The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp.

Attributes

Multithreading (see pthreads(7) )

The strsep() function is thread-safe.

Conforming to

4.4BSD.

Notes

The strsep() function was introduced as a replacement for strtok(3) , since the latter cannot handle empty fields. However, strtok(3) conforms to C89/C99 and hence is more portable.

Bugs

Be cautious when using this function. If you do use it, note that:
*
This function modifies its first argument.
*
This function cannot be used on constant strings.
*
The identity of the delimiting character is lost.

See Also

index(3) , memchr(3) , rindex(3) , strchr(3) , string(3) , strpbrk(3) , strspn(3) , strstr(3) , strtok(3)

Colophon

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