/*************************************************************************\
*                  Copyright (C) Michael Kerrisk, 2026.                   *
*                                                                         *
* This program is free software. You may use, modify, and redistribute it *
* under the terms of the GNU Lesser General Public License as published   *
* by the Free Software Foundation, either version 3 or (at your option)   *
* any later version. This program is distributed without any warranty.    *
* See the files COPYING.lgpl-v3 and COPYING.gpl-v3 for details.           *
\*************************************************************************/

#include <string.h>
#include <stdlib.h>
#include "itimerspec_from_str.h"        /* Declares function defined here */

/* Convert a string of the following form to an itimerspec structure:
   "value.sec[/value.nanosec][:interval.sec[/interval.nanosec]]".
   Optional components that are omitted cause 0 to be assigned to the
   corresponding structure fields. */

void
itimerspecFromStr(char *str, struct itimerspec *tsp)
{
    char *dupstr ,*cptr, *sptr;

    dupstr = strdup(str);

    cptr = strchr(dupstr, ':');
    if (cptr != NULL)
        *cptr = '\0';

    sptr = strchr(dupstr, '/');
    if (sptr != NULL)
        *sptr = '\0';

    tsp->it_value.tv_sec = atoi(dupstr);
    tsp->it_value.tv_nsec = (sptr != NULL) ? atoi(sptr + 1) : 0;

    if (cptr == NULL) {
        tsp->it_interval.tv_sec = 0;
        tsp->it_interval.tv_nsec = 0;
    } else {
        sptr = strchr(cptr + 1, '/');
        if (sptr != NULL)
            *sptr = '\0';
        tsp->it_interval.tv_sec = atoi(cptr + 1);
        tsp->it_interval.tv_nsec = (sptr != NULL) ? atoi(sptr + 1) : 0;
    }
    free(dupstr);
}