Manpages - strsep.3

strsep - extract token from string

  #include <string.h>

  char *strsep(char **restrict stringp, const char *restrict delim);

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

*strsep*():

      Since glibc 2.19:
          _DEFAULT_SOURCE
      Glibc 2.19 and earlier:
          _BSD_SOURCE

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 (’\0’), 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.

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

For an explanation of the terms used in this section, see *attributes*(7).

4.4BSD.

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.

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.

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

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