char *
strsep(char **stringp, const char *delim)
char *
stresep(char **stringp, const char *delim, int escape)
)
function locates, in the nul-terminated 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
by
strsep()
to
`\0'.
If
*stringp
is initially
NULL,
strsep()
returns
NULL.
The
stresep()
function also takes an escape character that allows quoting the delimiter
character so that it can be part of the source string.
)
to parse a string, containing tokens delimited by white space, into an
argument vector:
char **ap, *argv[10], *inputstring;
for (ap = argv; ap < &argv[9] &&
(*ap = strsep(&inputstring, " \t")) != NULL;) {
if (**ap != '\0')
ap++;
}
)
function
is intended as a replacement for the
strtok()
function.
While the
strtok()
function should be preferred for portability reasons (it conforms to
ANSI X3.159-1989 (``ANSI C89'') )
it is unable to handle empty fields, i.e., detect fields delimited 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.