/**
* Copyright © 2015 Mattias Andrée <maandree@member.fsf.org>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "parse_time.h"
/**
* The name of the process.
*/
char *argv0 = "sat";
/**
* Print usage information.
*/
static void
usage(void)
{
fprintf(stderr, "usage: %s TIME COMMAND...\n",
strrchr(argv0) ? (strrchr(argv0) + 1) : argv0);
exit(2);
}
/**
* Return the number of bytes required to store a string array.
*
* @param array The string array.
* @return The number of bytes required to store the array.
*/
static size_t
measure_array(char *array[])
{
size_t rc = 1;
for (; *array; array++)
rc += strlen(*array) + 1;
return rc * sizeof(char);
}
/**
* Store a string array.
*
* @param storage The buffer where the array is to be stored.
* @param array The array to store.
* @return Where in the buffer the array ends.
*/
static char *
store_array(char *restrict storage, char *array[])
{
for (; *array; array++) {
storage = stpcpy(storage, *array);
*storage++ = 0;
}
*storage++ = 0;
return storage;
}
/**
* Queue a job for later execution.
*
* @param argc You guess!
* @param argv The first element should be the name of the process,
* the second argument should be the POSIX time (seconds
* since Epoch (1970-01-01 00:00:00 UTC), disregarding
* leap seconds) the job shall be executed. The rest of
* the arguments (being at least one) shoul be the
* command line arguments for the job the run.
* @param envp The environment.
* @return 0 The process was successful.
* @return 1 The process failed queuing the job.
* @return 2 User error, you do not know what you are doing.
* @return 3 satd(1) failed to queue the job.
*/
int
main(int argc, char *argv[], char *envp[])
{
struct timespec ts;
clockid_t clk;
char *message;
size_t message_size;
if ((argc < 3) || (argv[1][0] == '-')) {
usage();
}
argv0 = argv[0];
/* Parse the time argument. */
if (parse_time(argv[1], &ts, &clk)) {
switch (errno) {
case EINVAL:
fprintf(stderr,
"%s: time parameter cound not be parsed, perhaps you "
"you need an external parser: %s\n", argv0, str);
return 2;
case ERANGE:
fprintf(stderr,
"%s: the specified time is beyond the limit of what "
"can be represented by `struct timespec`: %s\n", argv0, str);
return 2;
case EDOM:
fprintf(stderr,
"%s: the specified time is in past, and more than "
"a day ago: %s\n", argv0, str);
return 2;
default:
goto fail;
}
}
argc -= 2;
argv += 2;
/* Construct message to send to the daemon. */
message_size = measure_array(argv) + measure_array(envp);
message = malloc(message_size);
if (!message)
goto fail;
store_array(store_array(message, argv), envp);
fail:
perror(argv0);
return 1;
}
