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

   1 /*
   2  * gf.c
   3  *
   4  * Read directories in a buffered way
   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 "gf.h"
  38
  39 /*----- Main code ---------------------------------------------------------*/
  40
  41 /* --- @gf_init@ --- *
  42  *
  43  * Arguments:   @gf_ctx *g@ = pointer to a context buffer for me
  44  *              @const char *pat@ = pointer to a (RISC OS) pattern string
  45  *              @cost char *dir@ = pointer to name of parent directory
  46  *
  47  * Returns:     ---
  48  *
  49  * Use:         Initialise a wildcard match context ready for scanning.
  50  */
  51
  52 void gf_init(gf_ctx *g, const char *pat, const char *dir)
  53 {
  54   g->ctx = 0;
  55   g->pat = pat;
  56   g->dir = dir;
  57   g->nleft = 0;
  58 }
  59
  60 /* --- @gf_next@ --- *
  61  *
  62  * Arguments:   @gf_ctx *g@ = pointer to my context
  63  *
  64  * Returns:     Pointer to a filename, or zero for end
  65  *
  66  * Use:         Returns the next matching file from the block.
  67  */
  68
  69 char *gf_next(gf_ctx *g)
  70 {
  71   /* --- See if the buffer is empty --- */
  72
  73   while (!g->nleft) {
  74
  75     /* --- Check for end of the list --- */
  76
  77     if (g->ctx == -1)
  78       return (0);
  79
  80     /* --- Fetch some more items from the list --- */
  81
  82     g->p = g->buf;
  83     if (_swix(OS_GBPB, _inr(0, 6) | _out(3) | _out(4),
  84               9, g->dir, g->buf, 1024, g->ctx, sizeof(g->buf), g->pat,
  85               &g->nleft, &g->ctx))
  86       return (0);
  87   }
  88
  89   /* --- Dole out the next item from the list --- */
  90
  91   {
  92     char *p = g->p;
  93
  94     while (*g->p)
  95       g->p++;
  96     g->p++;
  97     g->nleft--;
  98     return (p);
  99   }
 100 }
 101
 102 /*----- That's all, folks -------------------------------------------------*/