mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Utilities/c/each

   1 /*
   2  * each.c
   3  *
   4  * Run a command on each of a bunch of files
   5  *
   6  * © 1998 Straylight/Edgeware
   7  */
   8
   9 /*----- Licensing note ----------------------------------------------------*
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, write to the Free Software Foundation,
  23  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  */
  25
  26 /*----- Header files ------------------------------------------------------*/
  27
  28 #include <stddef.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include "kernel.h"
  34 #include "swis.h"
  35 #include "swiv.h"
  36
  37 #include "glob.h"
  38
  39 /*----- Run commands ------------------------------------------------------*/
  40
  41 typedef struct each_ctx {
  42   int estat;
  43   const char *skel;
  44   size_t sksz;
  45 } each_ctx;
  46
  47 /* --- @run@ --- *
  48  *
  49  * Arguments:   @const char *f@ = pointer to a filename
  50  *              @void *ctx@ = pointer to a context block
  51  *
  52  * Returns:     ---
  53  *
  54  * Use:         Handles files.
  55  */
  56
  57 static void run(const char *f, void *ctx)
  58 {
  59   each_ctx *ex = ctx;
  60   char buf[1024];
  61   int e;
  62
  63   _swi(OS_SubstituteArgs, _inr(0, 4),
  64        f, buf, sizeof(buf), ex->skel, ex->sksz);
  65   e = system(buf);
  66   switch (e) {
  67     case 0:
  68       /* Nothing to do */;
  69       break;
  70     case -2:
  71       fprintf(stderr, "each: couldn't run `%s': %s\n",
  72               buf, _kernel_last_oserror()->errmess);
  73     default:
  74       ex->estat = e;
  75       break;
  76   }
  77 }
  78
  79 /* --- @main@ --- *
  80  *
  81  * Arguments:   @int argc@ = number of arguments
  82  *              @char *argv[]@ = list of arguments
  83  *
  84  * Returns:     Zero if all went well
  85  *
  86  * Use:         Installs files in the right places.  This is a bit of a
  87  *              rip-off of unix `cp'.
  88  */
  89
  90 int main(int argc, char *argv[])
  91 {
  92   each_ctx ex;
  93   int i;
  94
  95   /* --- Make sure we have some arguments --- */
  96
  97   if (argc < 3) {
  98     fprintf(stderr, "Usage: each COMMAND FILE...\n");
  99     exit(1);
 100   }
 101
 102   /* --- Go to work --- */
 103
 104   ex.skel = argv[1];
 105   ex.sksz = strlen(ex.skel);
 106   ex.estat = 0;
 107
 108   for (i = 2; i < argc; i++) {
 109     if (glob(argv[i], run, &ex) == 0)
 110       run(argv[i], &ex);
 111   }
 112
 113   /* --- Done --- */
 114
 115   return (ex.estat);
 116 }
 117
 118 /*----- That's all, folks -------------------------------------------------*/