arch/powerpc/boot/dtc-src/srcpos.c

   1 /*
   2  * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  17  *                                                                   USA
  18  */
  19
  20 #include "dtc.h"
  21 #include "srcpos.h"
  22
  23 /*
  24  * Like yylineno, this is the current open file pos.
  25  */
  26
  27 struct dtc_file *srcpos_file;
  28
  29 static int dtc_open_one(struct dtc_file *file,
  30                         const char *search,
  31                         const char *fname)
  32 {
  33         char *fullname;
  34
  35         if (search) {
  36                 fullname = xmalloc(strlen(search) + strlen(fname) + 2);
  37
  38                 strcpy(fullname, search);
  39                 strcat(fullname, "/");
  40                 strcat(fullname, fname);
  41         } else {
  42                 fullname = strdup(fname);
  43         }
  44
  45         file->file = fopen(fullname, "r");
  46         if (!file->file) {
  47                 free(fullname);
  48                 return 0;
  49         }
  50
  51         file->name = fullname;
  52         return 1;
  53 }
  54
  55
  56 struct dtc_file *dtc_open_file(const char *fname,
  57                                const struct search_path *search)
  58 {
  59         static const struct search_path default_search = { NULL, NULL, NULL };
  60
  61         struct dtc_file *file;
  62         const char *slash;
  63
  64         file = xmalloc(sizeof(struct dtc_file));
  65
  66         slash = strrchr(fname, '/');
  67         if (slash) {
  68                 char *dir = xmalloc(slash - fname + 1);
  69
  70                 memcpy(dir, fname, slash - fname);
  71                 dir[slash - fname] = 0;
  72                 file->dir = dir;
  73         } else {
  74                 file->dir = NULL;
  75         }
  76
  77         if (streq(fname, "-")) {
  78                 file->name = "stdin";
  79                 file->file = stdin;
  80                 return file;
  81         }
  82
  83         if (fname[0] == '/') {
  84                 file->file = fopen(fname, "r");
  85                 if (!file->file)
  86                         goto fail;
  87
  88                 file->name = strdup(fname);
  89                 return file;
  90         }
  91
  92         if (!search)
  93                 search = &default_search;
  94
  95         while (search) {
  96                 if (dtc_open_one(file, search->dir, fname))
  97                         return file;
  98
  99                 if (errno != ENOENT)
 100                         goto fail;
 101
 102                 search = search->next;
 103         }
 104
 105 fail:
 106         die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
 107 }
 108
 109 void dtc_close_file(struct dtc_file *file)
 110 {
 111         if (fclose(file->file))
 112                 die("Error closing \"%s\": %s\n", file->name, strerror(errno));
 113
 114         free(file->dir);
 115         free(file);
 116 }