Extracting info from string

[fkheng]

I have a string containing '|' delimiters which is like :

Testing|1|2|3|4

What I want to do is to extract the data in between the delimiters respectively.
The problem is i do not know how many '|' are in between...

and assuming i do not know how many delimiters there are, how do i detect the number of '|' or does anyone know a way around this?

[anoopks]

You can use strtok() for the same. Look up the man pages.

Anoop.

[Prelude]

strtok is okay as long as you don't have to worry about concurrency or nested calls. In those cases strtok will fail miserably. Some libraries have a strtok_r that is reentrant, but I've found that it's easier just to follow in the footsteps of argc and argv:

/* Warning: Ugly code follows. Sorry, written in haste. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int makeargv(char *plist, char ***argv, char *delim)
{
    char   *pos = plist;
    size_t dlen = strlen(delim);
    int    argc = 0;
    int    i;

    /* Count args */
    while ((pos = strstr(pos, delim)) != NULL) {
        argc++;
        pos += dlen;
    }

    if ((*argv = malloc((argc + 1) * sizeof **argv)) == NULL)
        return -1;

    for (i = 0, pos = plist; i < argc; i++, plist = pos + dlen) {
        pos = strstr(plist, delim);

        if (((*argv)[i] = calloc((pos - plist) + 1, sizeof (*argv)[i])) == NULL) {
            while (--i >= 0)
                free((*argv)[i]);
            free(*argv);

            return -1;
        }

        strncpy((*argv)[i], plist, pos - plist);
    }

    /* Last token */
    if (((*argv)[i] = calloc(strlen(plist) + 1, sizeof (*argv)[i])) == NULL) {
        while (--i >= 0)
            free((*argv)[i]);
        free(*argv);

        return -1;
    }

    strcpy((*argv)[i++], plist);
    (*argv)[i] = NULL;

    return argc + 1;
}

int main(void)
{
    char **argv;
    char test[] = "Testing|1|2|3|4";
    int  argc;
    int  i;

    /* Using makeargv */
    if ((argc = makeargv(test, &argv, "|")) != -1) {
        for (i = 0; i < argc; i++) {
            puts(argv[i]);
            free(argv[i]);
        }

        free(argv);
    }

    return 0;
}

[elad]

oops, entered wrong board, message deleted. Sorry.