scripts/dtc/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 #define _GNU_SOURCE
  21
  22 #include <stdio.h>
  23
  24 #include "dtc.h"
  25 #include "srcpos.h"
  26
  27 /* A node in our list of directories to search for source/include files */
  28 struct search_path {
  29         struct search_path *next;       /* next node in list, NULL for end */
  30         const char *dirname;            /* name of directory to search */
  31 };
  32
  33 /* This is the list of directories that we search for source files */
  34 static struct search_path *search_path_head, **search_path_tail;
  35
  36
  37 static char *get_dirname(const char *path)
  38 {
  39         const char *slash = strrchr(path, '/');
  40
  41         if (slash) {
  42                 int len = slash - path;
  43                 char *dir = xmalloc(len + 1);
  44
  45                 memcpy(dir, path, len);
  46                 dir[len] = '\0';
  47                 return dir;
  48         }
  49         return NULL;
  50 }
  51
  52 FILE *depfile; /* = NULL */
  53 struct srcfile_state *current_srcfile; /* = NULL */
  54
  55 /* Detect infinite include recursion. */
  56 #define MAX_SRCFILE_DEPTH     (100)
  57 static int srcfile_depth; /* = 0 */
  58
  59
  60 /**
  61  * Try to open a file in a given directory.
  62  *
  63  * If the filename is an absolute path, then dirname is ignored. If it is a
  64  * relative path, then we look in that directory for the file.
  65  *
  66  * @param dirname       Directory to look in, or NULL for none
  67  * @param fname         Filename to look for
  68  * @param fp            Set to NULL if file did not open
  69  * @return allocated filename on success (caller must free), NULL on failure
  70  */
  71 static char *try_open(const char *dirname, const char *fname, FILE **fp)
  72 {
  73         char *fullname;
  74
  75         if (!dirname || fname[0] == '/')
  76                 fullname = xstrdup(fname);
  77         else
  78                 fullname = join_path(dirname, fname);
  79
  80         *fp = fopen(fullname, "rb");
  81         if (!*fp) {
  82                 free(fullname);
  83                 fullname = NULL;
  84         }
  85
  86         return fullname;
  87 }
  88
  89 /**
  90  * Open a file for read access
  91  *
  92  * If it is a relative filename, we search the full search path for it.
  93  *
  94  * @param fname Filename to open
  95  * @param fp    Returns pointer to opened FILE, or NULL on failure
  96  * @return pointer to allocated filename, which caller must free
  97  */
  98 static char *fopen_any_on_path(const char *fname, FILE **fp)
  99 {
 100         const char *cur_dir = NULL;
 101         struct search_path *node;
 102         char *fullname;
 103
 104         /* Try current directory first */
 105         assert(fp);
 106         if (current_srcfile)
 107                 cur_dir = current_srcfile->dir;
 108         fullname = try_open(cur_dir, fname, fp);
 109
 110         /* Failing that, try each search path in turn */
 111         for (node = search_path_head; !*fp && node; node = node->next)
 112                 fullname = try_open(node->dirname, fname, fp);
 113
 114         return fullname;
 115 }
 116
 117 FILE *srcfile_relative_open(const char *fname, char **fullnamep)
 118 {
 119         FILE *f;
 120         char *fullname;
 121
 122         if (streq(fname, "-")) {
 123                 f = stdin;
 124                 fullname = xstrdup("<stdin>");
 125         } else {
 126                 fullname = fopen_any_on_path(fname, &f);
 127                 if (!f)
 128                         die("Couldn't open \"%s\": %s\n", fname,
 129                             strerror(errno));
 130         }
 131
 132         if (depfile)
 133                 fprintf(depfile, " %s", fullname);
 134
 135         if (fullnamep)
 136                 *fullnamep = fullname;
 137         else
 138                 free(fullname);
 139
 140         return f;
 141 }
 142
 143 void srcfile_push(const char *fname)
 144 {
 145         struct srcfile_state *srcfile;
 146
 147         if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
 148                 die("Includes nested too deeply");
 149
 150         srcfile = xmalloc(sizeof(*srcfile));
 151
 152         srcfile->f = srcfile_relative_open(fname, &srcfile->name);
 153         srcfile->dir = get_dirname(srcfile->name);
 154         srcfile->prev = current_srcfile;
 155
 156         srcfile->lineno = 1;
 157         srcfile->colno = 1;
 158
 159         current_srcfile = srcfile;
 160 }
 161
 162 bool srcfile_pop(void)
 163 {
 164         struct srcfile_state *srcfile = current_srcfile;
 165
 166         assert(srcfile);
 167
 168         current_srcfile = srcfile->prev;
 169
 170         if (fclose(srcfile->f))
 171                 die("Error closing \"%s\": %s\n", srcfile->name,
 172                     strerror(errno));
 173
 174         /* FIXME: We allow the srcfile_state structure to leak,
 175          * because it could still be referenced from a location
 176          * variable being carried through the parser somewhere.  To
 177          * fix this we could either allocate all the files from a
 178          * table, or use a pool allocator. */
 179
 180         return current_srcfile ? true : false;
 181 }
 182
 183 void srcfile_add_search_path(const char *dirname)
 184 {
 185         struct search_path *node;
 186
 187         /* Create the node */
 188         node = xmalloc(sizeof(*node));
 189         node->next = NULL;
 190         node->dirname = xstrdup(dirname);
 191
 192         /* Add to the end of our list */
 193         if (search_path_tail)
 194                 *search_path_tail = node;
 195         else
 196                 search_path_head = node;
 197         search_path_tail = &node->next;
 198 }
 199
 200 /*
 201  * The empty source position.
 202  */
 203
 204 struct srcpos srcpos_empty = {
 205         .first_line = 0,
 206         .first_column = 0,
 207         .last_line = 0,
 208         .last_column = 0,
 209         .file = NULL,
 210 };
 211
 212 void srcpos_update(struct srcpos *pos, const char *text, int len)
 213 {
 214         int i;
 215
 216         pos->file = current_srcfile;
 217
 218         pos->first_line = current_srcfile->lineno;
 219         pos->first_column = current_srcfile->colno;
 220
 221         for (i = 0; i < len; i++)
 222                 if (text[i] == '\n') {
 223                         current_srcfile->lineno++;
 224                         current_srcfile->colno = 1;
 225                 } else {
 226                         current_srcfile->colno++;
 227                 }
 228
 229         pos->last_line = current_srcfile->lineno;
 230         pos->last_column = current_srcfile->colno;
 231 }
 232
 233 struct srcpos *
 234 srcpos_copy(struct srcpos *pos)
 235 {
 236         struct srcpos *pos_new;
 237
 238         pos_new = xmalloc(sizeof(struct srcpos));
 239         memcpy(pos_new, pos, sizeof(struct srcpos));
 240
 241         return pos_new;
 242 }
 243
 244 char *
 245 srcpos_string(struct srcpos *pos)
 246 {
 247         const char *fname = "<no-file>";
 248         char *pos_str;
 249
 250         if (pos->file && pos->file->name)
 251                 fname = pos->file->name;
 252
 253
 254         if (pos->first_line != pos->last_line)
 255                 xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
 256                           pos->first_line, pos->first_column,
 257                           pos->last_line, pos->last_column);
 258         else if (pos->first_column != pos->last_column)
 259                 xasprintf(&pos_str, "%s:%d.%d-%d", fname,
 260                           pos->first_line, pos->first_column,
 261                           pos->last_column);
 262         else
 263                 xasprintf(&pos_str, "%s:%d.%d", fname,
 264                           pos->first_line, pos->first_column);
 265
 266         return pos_str;
 267 }
 268
 269 void srcpos_verror(struct srcpos *pos, const char *prefix,
 270                    const char *fmt, va_list va)
 271 {
 272         char *srcstr;
 273
 274         srcstr = srcpos_string(pos);
 275
 276         fprintf(stderr, "%s: %s ", prefix, srcstr);
 277         vfprintf(stderr, fmt, va);
 278         fprintf(stderr, "\n");
 279
 280         free(srcstr);
 281 }
 282
 283 void srcpos_error(struct srcpos *pos, const char *prefix,
 284                   const char *fmt, ...)
 285 {
 286         va_list va;
 287
 288         va_start(va, fmt);
 289         srcpos_verror(pos, prefix, fmt, va);
 290         va_end(va);
 291 }
 292
 293 void srcpos_set_line(char *f, int l)
 294 {
 295         current_srcfile->name = f;
 296         current_srcfile->lineno = l;
 297 }