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

   1 /*
   2  * cmdr.c
   3  *
   4  * Perform expansions on the command line arguments
   5  *
   6  * © 1998 Straylight/Edgeware
   7  */
   8
   9 /*----- Licensing note ----------------------------------------------------*
  10  *
  11  * This file is part of Straylight's core utilities (coreutils).
  12  *
  13  * Coreutils is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2, or (at your option)
  16  * any later version.
  17  *
  18  * Coreutils is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with coreutils.  If not, write to the Free Software Foundation,
  25  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #include "swis.h"
  35 #include "swiv.h"
  36
  37 #include "alloc.h"
  38 #include "cmdr.h"
  39 #include "gf.h"
  40 #include "glob.h"
  41
  42 /*----- Type definitions --------------------------------------------------*/
  43
  44 typedef struct cmdr_ctx {
  45   char **av;                            /* Pointer to @argv@ array */
  46   size_t sz;                            /* Size currently allocated */
  47   size_t i;                             /* Next available @argv@ index */
  48 } cmdr_ctx;
  49
  50 /*----- Main code ---------------------------------------------------------*/
  51
  52 /* --- @cmdr_add@ --- *
  53  *
  54  * Arguments:   @const char *p@ = pointer to an expanded item
  55  *              @void *ctx@ = pointer to my context
  56  *
  57  * Returns:     ---
  58  *
  59  * Use:         Adds a globbed filename to the output buffer.
  60  */
  61
  62 static void cmdr_add(const char *p, void *ctx)
  63 {
  64   cmdr_ctx *cx = ctx;
  65
  66   if (cx->i == cx->sz) {
  67     cx->sz += 1024;
  68     cx->av = xrealloc(cx->av, cx->sz * sizeof(cx->av[0]));
  69   }
  70   cx->av[cx->i++] = xstrdup(p);
  71 }
  72
  73 /* --- @cmdreplace@ --- *
  74  *
  75  * Arguments:   @int *argc@ = pointer to argument count
  76  *              @char ***argv@ = address of pointer to arg list
  77  *
  78  * Returns:     ---
  79  *
  80  * Use:         Mangles the argument list until it's nice.
  81  */
  82
  83 void cmdreplace(int *argc, char ***argv)
  84 {
  85   cmdr_ctx cx;
  86   char **iav = *argv;
  87   int iac = 0;
  88
  89   /* --- Initialise the context --- */
  90
  91   cx.sz = 256;
  92   cx.av = xmalloc(cx.sz * sizeof(cx.av[0]));
  93   cx.i = 0;
  94
  95   /* --- Copy over @argv[0]@ because it's special --- */
  96
  97   cx.av[cx.i++] = iav[iac++];
  98
  99   /* --- Copy over everything else --- */
 100
 101   while (iav[iac]) {
 102     if (glob(iav[iac], cmdr_add, &cx) == 0) {
 103       if (cx.i == cx.sz) {
 104         cx.sz += 1024;
 105         cx.av = xrealloc(cx.av, cx.sz * sizeof(cx.av[0]));
 106       }
 107       cx.av[cx.i++] = iav[iac];
 108     }
 109     iac++;
 110   }
 111
 112   /* --- Copy over the terminator --- */
 113
 114   if (cx.i == cx.sz) {
 115     cx.sz += 1024;
 116     cx.av = xrealloc(cx.av, cx.sz * sizeof(cx.av[0]));
 117   }
 118   cx.av[cx.i] = 0;
 119
 120   /* --- Return appropriate values to the caller --- */
 121
 122   *argc = cx.i;
 123   *argv = cx.av;
 124 }
 125
 126 /*----- That's all, folks -------------------------------------------------*/