read_lastwallpaper.c

/*
 * Copyright (c) 2004 - 2016 Han Boetes <hboetes@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "fbsetbg.h"


/*
 * This function reads arguments of the last remembered session for reuse for
 * fbsetbg -l
 */
int
read_lastwallpaper(char *option, char *wallpaper)
{

        char            *lstwllpprarray;
        char            *tempstring;
        char            *display, *t1, *t2;
        FILE            *fp;
        uint             i;
        int              found = FALSE, ret;

        tempstring     = malloc(MAXPATHLEN);
        if (tempstring == NULL)
                err(1, "out of memory");

        lstwllpprarray = malloc(MAXPATHLEN);
        if (lstwllpprarray == NULL)
                err(1, "out of memory");

        /* Copy the pointers for freeing (because of strsep */
        t1             = tempstring;
        t2             = lstwllpprarray;

        if ((display = getenv("DISPLAY")) == NULL)
                errx(1, "the DISPLAY environment variable isn't set");

        if ((fp = fopen(lastwallpaper, "r")) == NULL)
                /* Most likely ~/.lastwallpaper doesn't exist */
                err(1, "%s", lastwallpaper);

        for (i = 0; i < MAXLLW; i++)
        {
                if (fgets(lstwllpprarray, MAXPATHLEN, fp) == NULL)
                                break;

                ret = snprintf(tempstring, MAXPATHLEN, "|%s\n", display);
                if (ret < 0 || ret >= MAXPATHLEN)
                {
                        if (fclose(fp) != 0)
                                err(1, "%s", lastwallpaper);
                        errx(1, "error while trying to read %s", lastwallpaper);
                }

                if (strstr(lstwllpprarray, tempstring))
                {
                        (void)strncpy(option, strsep(&lstwllpprarray, "|"), MAXPATHLEN - 1);
                        option[MAXPATHLEN - 1] = '\0';

                        (void)strncpy(wallpaper, strsep(&lstwllpprarray, "|"), MAXPATHLEN - 1);
                        wallpaper[MAXPATHLEN - 1] = '\0';

                        found = TRUE;
                        break;
                }
        }

        if (fclose(fp) != 0)
                err(1, "%s", lastwallpaper);

        free(t1);
        free(t2);

        if (found == TRUE)
                return(TRUE);
        else
                errx(1, "no wallpaper recorded for display %s", display);
}