strsep - extract token from string
char *strsep(char **stringp, const char *delim);
If *stringp is NULL, the strsep() function returns NULL and does nothing
else. Otherwise, this function finds the first token in the string
*stringp, where tokens are delimited by symbols in the string delim.
This token is terminated with a `\0' character (by overwriting the
delimiter) 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.
The strsep() function was introduced as a replacement for strtok(),
since the latter cannot handle empty fields. However, strtok() conforms
to ANSI-C and hence is more portable.
This function suffers from the same problems as strtok(). In particular,
it modifies the original string. Avoid it.
index(3), memchr(3), rindex(3), strchr(3), strpbrk(3), strspn(3),
GNU 1993-04-12 STRSEP(3)
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