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 /*
  25  * Record the complete unique set of opened file names.
  26  * Primarily used to cache source position file names.
  27  */
  28 #define MAX_N_FILE_NAMES        (100)
  29
  30 const char *file_names[MAX_N_FILE_NAMES];
  31 static int n_file_names = 0;
  32
  33 /*
  34  * Like yylineno, this is the current open file pos.
  35  */
  36
  37 int srcpos_filenum = -1;
  38
  39
  40
  41 FILE *dtc_open_file(const char *fname)
  42 {
  43         FILE *f;
  44
  45         if (lookup_file_name(fname, 1) < 0)
  46                 die("Too many files opened\n");
  47
  48         if (streq(fname, "-"))
  49                 f = stdin;
  50         else
  51                 f = fopen(fname, "r");
  52
  53         if (! f)
  54                 die("Couldn't open \"%s\": %s\n", fname, strerror(errno));
  55
  56         return f;
  57 }
  58
  59
  60
  61 /*
  62  * Locate and optionally add filename fname in the file_names[] array.
  63  *
  64  * If the filename is currently not in the array and the boolean
  65  * add_it is non-zero, an attempt to add the filename will be made.
  66  *
  67  * Returns;
  68  *    Index [0..MAX_N_FILE_NAMES) where the filename is kept
  69  *    -1 if the name can not be recorded
  70  */
  71
  72 int lookup_file_name(const char *fname, int add_it)
  73 {
  74         int i;
  75
  76         for (i = 0; i < n_file_names; i++) {
  77                 if (strcmp(file_names[i], fname) == 0)
  78                         return i;
  79         }
  80
  81         if (add_it) {
  82                 if (n_file_names < MAX_N_FILE_NAMES) {
  83                         file_names[n_file_names] = strdup(fname);
  84                         return n_file_names++;
  85                 }
  86         }
  87
  88         return -1;
  89 }
  90
  91
  92 const char *srcpos_filename_for_num(int filenum)
  93 {
  94         if (0 <= filenum && filenum < n_file_names) {
  95                 return file_names[filenum];
  96         }
  97
  98         return 0;
  99 }
 100
 101
 102 const char *srcpos_get_filename(void)
 103 {
 104         return srcpos_filename_for_num(srcpos_filenum);
 105 }