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char *strsep(char **stringp, const char *delim);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
If *stringp is NULL, the strsep() function returns NULL and does noth-
ing 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.
Multithreading (see pthreads(7))
The strsep() function is thread-safe.
The strsep() function was introduced as a replacement for strtok(3),
since the latter cannot handle empty fields. However, strtok(3) con-
forms 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), str-
spn(3), strstr(3), strtok(3)
GNU 2014-02-25 STRSEP(3)