BSD 2.11 - man page for strsep (bsd section 3)
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strsep - separate strings
The strsep() function locates, in the string referenced by *stringp , the first occurrence
of any character in the string delim (or the terminating `\0' character) and replaces it
with a `\0'. The location of the next character after the delimiter character (or NULL,
if the end of the string was reached) is stored in *stringp . The original value of
*stringp is returned.
An ``empty'' field, i.e. one caused by two adjacent delimiter characters, can be detected
by comparing the location referenced by the pointer returned in *stringp to `\0'.
If *stringp is initially NULL, strsep() returns NULL.
The following uses strsep() to parse a string, containing tokens delimited by white space,
into an argument vector:
char **ap, *argv, *inputstring;
for (ap = argv; (*ap = strsep(&inputstring, " \t")) != NULL;)
if (**ap != '\0')
The strsep() function is intended as a replacement for the strtok() function. While the
strtok() function should be preferred for portability reasons (it conforms to ANSI C
X3.159-1989 (``ANSI C'')) it is unable to handle empty fields, i.e. detect fields delim-
ited by two adjacent delimiter characters, or to be used for more than a single string at
a time. The strsep() function first appeared in 4.4BSD.
4.4 Berkeley Distribution January 12, 1996 STRSEP(3)
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