NAME

strsep - extract token from string

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

#include <string.h>

char *strsep(char **restrict stringp, const char *restrict delim);

strsep():

    Since glibc 2.19:

        _DEFAULT_SOURCE

    glibc 2.19 and earlier:

        _BSD_SOURCE

DESCRIPTION

If *stringp is NULL, the strsep() function returns NULL and does nothing 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.

RETURN VALUE

The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

STANDARDS

BSD.

HISTORY

4.4BSD.

The strsep() function was introduced as a replacement for strtok(3), since the latter cannot handle empty fields.

CAVEATS

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.

EXAMPLES

The program below is a port of the one found in strtok(3), which, however, doesn't discard multiple delimiters or empty tokens:

$ ./a.out 'a/bbb///cc;xxx:yyy:' ':;' '/'
1: a/bbb///cc

         --> a

         --> bbb

         -->

         -->

         --> cc
2: xxx

         --> xxx
3: yyy

         --> yyy
4:

         -->

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main(int argc, char *argv[])
{

    char *token, *subtoken;

    if (argc != 4) {

        fprintf(stderr, "Usage: %s string delim subdelim\n", argv[0]);

        exit(EXIT_FAILURE);

    }

    for (unsigned int j = 1; (token = strsep(&argv[1], argv[2])); j++) {

        printf("%u: %s\n", j, token);

        while ((subtoken = strsep(&token, argv[3])))

            printf("\t --> %s\n", subtoken);

    }

    exit(EXIT_SUCCESS);
}

SEE ALSO

memchr(3), strchr(3), string(3), strpbrk(3), strspn(3), strstr(3), strtok(3)