| STRSEP(3) | Library Functions Manual | STRSEP(3) |
strsep —
#include <string.h>
char *
strsep(char
**stringp, const char
*delim);
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 by strsep() to
‘\0’.
If *stringp is initially
NULL, strsep() returns
NULL.
strsep() to parse a string,
containing tokens delimited by whitespace, into an argument vector:
char **ap, *argv[10], *inputstring;
for (ap = argv; ap < &argv[9] &&
(*ap = strsep(&inputstring, " \t")) != NULL;) {
if (**ap != '\0')
ap++;
}
*ap = NULL;
strsep() function first appeared in
4.3BSD-Reno. It is intended as a replacement for the
strtok(3) function. While the
strtok(3) 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.
| June 5, 2013 | OpenBSD-current |