/*
 * each.c
 *
 * Run a command on each of a bunch of files
 *
 * © 1998 Straylight/Edgeware
 */

/*----- Licensing note ----------------------------------------------------*
 *
 * 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 2, 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, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "kernel.h"
#include "swis.h"
#include "swiv.h"

#include "glob.h"

/*----- Run commands ------------------------------------------------------*/

typedef struct each_ctx {
  int estat;
  const char *skel;
  size_t sksz;
} each_ctx;

/* --- @run@ --- *
 *
 * Arguments:   @const char *f@ = pointer to a filename
 *              @void *ctx@ = pointer to a context block
 *
 * Returns:     ---
 *
 * Use:         Handles files.
 */

static void run(const char *f, void *ctx)
{
  each_ctx *ex = ctx;
  char buf[1024];
  int e;

  _swi(OS_SubstituteArgs, _inr(0, 4),
       f, buf, sizeof(buf), ex->skel, ex->sksz);
  e = system(buf);
  switch (e) {
    case 0:
      /* Nothing to do */;
      break;
    case -2:
      fprintf(stderr, "each: couldn't run `%s': %s\n",
              buf, _kernel_last_oserror()->errmess);
    default:
      ex->estat = e;
      break;
  }
}

/* --- @main@ --- *
 *
 * Arguments:	@int argc@ = number of arguments
 *		@char *argv[]@ = list of arguments
 *
 * Returns:	Zero if all went well
 *
 * Use:		Installs files in the right places.  This is a bit of a
 *		rip-off of unix `cp'.
 */

int main(int argc, char *argv[])
{
  each_ctx ex;
  int i;

  /* --- Make sure we have some arguments --- */

  if (argc < 3) {
    fprintf(stderr, "Usage: each COMMAND FILE...\n");
    exit(1);
  }

  /* --- Go to work --- */

  ex.skel = argv[1];
  ex.sksz = strlen(ex.skel);
  ex.estat = 0;

  for (i = 2; i < argc; i++) {
    if (glob(argv[i], run, &ex) == 0)
      run(argv[i], &ex);
  }

  /* --- Done --- */

  return (ex.estat);
}

/*----- That's all, folks -------------------------------------------------*/