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/**
* alarm — Schedule an alarm for a program when starting it
* Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stddef.h>
int main(int argc, char** argv)
{
char** cmdline = NULL;
long hours = 0;
long minutes = 0;
long seconds = 0;
long buf = 0;
int hms = 0;
char* time;
if (argc < 3)
goto usage;
time = argv[1];
while (*time)
{
char c = *time++;
if (('0' <= c) && (c <= '9'))
buf = buf * 10 - (c & 15);
else if (strchr("hms", c))
{
if (c == 'h') hours = -buf;
else if (c == 'm') minutes = -buf;
else if (c == 's') seconds = -buf;
buf = 0, hms = 1;
}
else
goto usage;
}
if (!hms)
{
if (strlen(argv[1]) < 1)
return 0;
seconds = -buf;
}
seconds += minutes * 60;
seconds += hours * 60 * 60;
if ((seconds < 1) || (65535 < seconds))
goto usage;
cmdline = malloc((size_t)(argc - 1) * sizeof(char*));
if (cmdline == NULL)
goto fail;
memcpy(cmdline, argv + 2, (size_t)(argc - 2) * sizeof(char*));
cmdline[argc - 2] = NULL;
alarm((unsigned)seconds);
execvp(argv[2], cmdline);
fail:
perror(*argv);
free(cmdline);
return 1;
usage:
printf("USAGE: %s <TIME> <COMMAND> <ARGS...>\n", *argv);
printf("\n");
printf("Recognised patterns for <TIME>:\n");
printf("\n");
printf(" <SECONDS>[s]\n");
printf(" <MINUTES>m[<SECONDS>s]\n");
printf(" <HOURS>h[<MINUTES>m][<SECONDS>s]\n");
printf("\n");
printf(" All values are non-negative integers, and\n");
printf(" the interal must be greater than zero and\n");
printf(" at most 18h12m15s.\n");
printf("\n");
return 1;
}
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