1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
4 */
5
6 #define _GNU_SOURCE
7
8 #include <stdio.h>
9
10 #include "dtc.h"
11 #include "srcpos.h"
12
13 /* A node in our list of directories to search for source/include files */
14 struct search_path {
15 struct search_path *next; /* next node in list, NULL for end */
16 const char *dirname; /* name of directory to search */
17 };
18
19 /* This is the list of directories that we search for source files */
20 static struct search_path *search_path_head, **search_path_tail;
21
22 /* Detect infinite include recursion. */
23 #define MAX_SRCFILE_DEPTH (100)
24 static int srcfile_depth; /* = 0 */
25
get_dirname(const char * path)26 static char *get_dirname(const char *path)
27 {
28 const char *slash = strrchr(path, '/');
29
30 if (slash) {
31 int len = slash - path;
32 char *dir = xmalloc(len + 1);
33
34 memcpy(dir, path, len);
35 dir[len] = '\0';
36 return dir;
37 }
38 return NULL;
39 }
40
41 FILE *depfile; /* = NULL */
42 struct srcfile_state *current_srcfile; /* = NULL */
43 static char *initial_path; /* = NULL */
44 static int initial_pathlen; /* = 0 */
45 static bool initial_cpp = true;
46
set_initial_path(char * fname)47 static void set_initial_path(char *fname)
48 {
49 int i, len = strlen(fname);
50
51 xasprintf(&initial_path, "%s", fname);
52 initial_pathlen = 0;
53 for (i = 0; i != len; i++)
54 if (initial_path[i] == '/')
55 initial_pathlen++;
56 }
57
shorten_to_initial_path(char * fname)58 static char *shorten_to_initial_path(char *fname)
59 {
60 char *p1, *p2, *prevslash1 = NULL;
61 int slashes = 0;
62
63 for (p1 = fname, p2 = initial_path; *p1 && *p2; p1++, p2++) {
64 if (*p1 != *p2)
65 break;
66 if (*p1 == '/') {
67 prevslash1 = p1;
68 slashes++;
69 }
70 }
71 p1 = prevslash1 + 1;
72 if (prevslash1) {
73 int diff = initial_pathlen - slashes, i, j;
74 int restlen = strlen(fname) - (p1 - fname);
75 char *res;
76
77 res = xmalloc((3 * diff) + restlen + 1);
78 for (i = 0, j = 0; i != diff; i++) {
79 res[j++] = '.';
80 res[j++] = '.';
81 res[j++] = '/';
82 }
83 strcpy(res + j, p1);
84 return res;
85 }
86 return NULL;
87 }
88
89 /**
90 * Try to open a file in a given directory.
91 *
92 * If the filename is an absolute path, then dirname is ignored. If it is a
93 * relative path, then we look in that directory for the file.
94 *
95 * @param dirname Directory to look in, or NULL for none
96 * @param fname Filename to look for
97 * @param fp Set to NULL if file did not open
98 * @return allocated filename on success (caller must free), NULL on failure
99 */
try_open(const char * dirname,const char * fname,FILE ** fp)100 static char *try_open(const char *dirname, const char *fname, FILE **fp)
101 {
102 char *fullname;
103
104 if (!dirname || fname[0] == '/')
105 fullname = xstrdup(fname);
106 else
107 fullname = join_path(dirname, fname);
108
109 *fp = fopen(fullname, "rb");
110 if (!*fp) {
111 free(fullname);
112 fullname = NULL;
113 }
114
115 return fullname;
116 }
117
118 /**
119 * Open a file for read access
120 *
121 * If it is a relative filename, we search the full search path for it.
122 *
123 * @param fname Filename to open
124 * @param fp Returns pointer to opened FILE, or NULL on failure
125 * @return pointer to allocated filename, which caller must free
126 */
fopen_any_on_path(const char * fname,FILE ** fp)127 static char *fopen_any_on_path(const char *fname, FILE **fp)
128 {
129 const char *cur_dir = NULL;
130 struct search_path *node;
131 char *fullname;
132
133 /* Try current directory first */
134 assert(fp);
135 if (current_srcfile)
136 cur_dir = current_srcfile->dir;
137 fullname = try_open(cur_dir, fname, fp);
138
139 /* Failing that, try each search path in turn */
140 for (node = search_path_head; !*fp && node; node = node->next)
141 fullname = try_open(node->dirname, fname, fp);
142
143 return fullname;
144 }
145
srcfile_relative_open(const char * fname,char ** fullnamep)146 FILE *srcfile_relative_open(const char *fname, char **fullnamep)
147 {
148 FILE *f;
149 char *fullname;
150
151 if (streq(fname, "-")) {
152 f = stdin;
153 fullname = xstrdup("<stdin>");
154 } else {
155 fullname = fopen_any_on_path(fname, &f);
156 if (!f)
157 die("Couldn't open \"%s\": %s\n", fname,
158 strerror(errno));
159 }
160
161 if (depfile)
162 fprintf(depfile, " %s", fullname);
163
164 if (fullnamep)
165 *fullnamep = fullname;
166 else
167 free(fullname);
168
169 return f;
170 }
171
srcfile_push(const char * fname)172 void srcfile_push(const char *fname)
173 {
174 struct srcfile_state *srcfile;
175
176 if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
177 die("Includes nested too deeply");
178
179 srcfile = xmalloc(sizeof(*srcfile));
180
181 srcfile->f = srcfile_relative_open(fname, &srcfile->name);
182 srcfile->dir = get_dirname(srcfile->name);
183 srcfile->prev = current_srcfile;
184
185 srcfile->lineno = 1;
186 srcfile->colno = 1;
187
188 current_srcfile = srcfile;
189
190 if (srcfile_depth == 1)
191 set_initial_path(srcfile->name);
192 }
193
srcfile_pop(void)194 bool srcfile_pop(void)
195 {
196 struct srcfile_state *srcfile = current_srcfile;
197
198 assert(srcfile);
199
200 current_srcfile = srcfile->prev;
201
202 if (fclose(srcfile->f))
203 die("Error closing \"%s\": %s\n", srcfile->name,
204 strerror(errno));
205
206 /* FIXME: We allow the srcfile_state structure to leak,
207 * because it could still be referenced from a location
208 * variable being carried through the parser somewhere. To
209 * fix this we could either allocate all the files from a
210 * table, or use a pool allocator. */
211
212 return current_srcfile ? true : false;
213 }
214
srcfile_add_search_path(const char * dirname)215 void srcfile_add_search_path(const char *dirname)
216 {
217 struct search_path *node;
218
219 /* Create the node */
220 node = xmalloc(sizeof(*node));
221 node->next = NULL;
222 node->dirname = xstrdup(dirname);
223
224 /* Add to the end of our list */
225 if (search_path_tail)
226 *search_path_tail = node;
227 else
228 search_path_head = node;
229 search_path_tail = &node->next;
230 }
231
srcpos_update(struct srcpos * pos,const char * text,int len)232 void srcpos_update(struct srcpos *pos, const char *text, int len)
233 {
234 int i;
235
236 pos->file = current_srcfile;
237
238 pos->first_line = current_srcfile->lineno;
239 pos->first_column = current_srcfile->colno;
240
241 for (i = 0; i < len; i++)
242 if (text[i] == '\n') {
243 current_srcfile->lineno++;
244 current_srcfile->colno = 1;
245 } else {
246 current_srcfile->colno++;
247 }
248
249 pos->last_line = current_srcfile->lineno;
250 pos->last_column = current_srcfile->colno;
251 }
252
253 struct srcpos *
srcpos_copy(struct srcpos * pos)254 srcpos_copy(struct srcpos *pos)
255 {
256 struct srcpos *pos_new;
257 struct srcfile_state *srcfile_state;
258
259 if (!pos)
260 return NULL;
261
262 pos_new = xmalloc(sizeof(struct srcpos));
263 assert(pos->next == NULL);
264 memcpy(pos_new, pos, sizeof(struct srcpos));
265
266 /* allocate without free */
267 srcfile_state = xmalloc(sizeof(struct srcfile_state));
268 memcpy(srcfile_state, pos->file, sizeof(struct srcfile_state));
269 pos_new->file = srcfile_state;
270
271 return pos_new;
272 }
273
srcpos_extend(struct srcpos * pos,struct srcpos * newtail)274 struct srcpos *srcpos_extend(struct srcpos *pos, struct srcpos *newtail)
275 {
276 struct srcpos *p;
277
278 if (!pos)
279 return newtail;
280
281 for (p = pos; p->next != NULL; p = p->next);
282 p->next = newtail;
283 return pos;
284 }
285
286 char *
srcpos_string(struct srcpos * pos)287 srcpos_string(struct srcpos *pos)
288 {
289 const char *fname = "<no-file>";
290 char *pos_str;
291
292 if (pos->file && pos->file->name)
293 fname = pos->file->name;
294
295
296 if (pos->first_line != pos->last_line)
297 xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
298 pos->first_line, pos->first_column,
299 pos->last_line, pos->last_column);
300 else if (pos->first_column != pos->last_column)
301 xasprintf(&pos_str, "%s:%d.%d-%d", fname,
302 pos->first_line, pos->first_column,
303 pos->last_column);
304 else
305 xasprintf(&pos_str, "%s:%d.%d", fname,
306 pos->first_line, pos->first_column);
307
308 return pos_str;
309 }
310
311 static char *
srcpos_string_comment(struct srcpos * pos,bool first_line,int level)312 srcpos_string_comment(struct srcpos *pos, bool first_line, int level)
313 {
314 char *pos_str, *fname, *first, *rest;
315 bool fresh_fname = false;
316
317 if (!pos) {
318 if (level > 1) {
319 xasprintf(&pos_str, "<no-file>:<no-line>");
320 return pos_str;
321 } else {
322 return NULL;
323 }
324 }
325
326 if (!pos->file)
327 fname = "<no-file>";
328 else if (!pos->file->name)
329 fname = "<no-filename>";
330 else if (level > 1)
331 fname = pos->file->name;
332 else {
333 fname = shorten_to_initial_path(pos->file->name);
334 if (fname)
335 fresh_fname = true;
336 else
337 fname = pos->file->name;
338 }
339
340 if (level > 1)
341 xasprintf(&first, "%s:%d:%d-%d:%d", fname,
342 pos->first_line, pos->first_column,
343 pos->last_line, pos->last_column);
344 else
345 xasprintf(&first, "%s:%d", fname,
346 first_line ? pos->first_line : pos->last_line);
347
348 if (fresh_fname)
349 free(fname);
350
351 if (pos->next != NULL) {
352 rest = srcpos_string_comment(pos->next, first_line, level);
353 xasprintf(&pos_str, "%s, %s", first, rest);
354 free(first);
355 free(rest);
356 } else {
357 pos_str = first;
358 }
359
360 return pos_str;
361 }
362
srcpos_string_first(struct srcpos * pos,int level)363 char *srcpos_string_first(struct srcpos *pos, int level)
364 {
365 return srcpos_string_comment(pos, true, level);
366 }
367
srcpos_string_last(struct srcpos * pos,int level)368 char *srcpos_string_last(struct srcpos *pos, int level)
369 {
370 return srcpos_string_comment(pos, false, level);
371 }
372
srcpos_verror(struct srcpos * pos,const char * prefix,const char * fmt,va_list va)373 void srcpos_verror(struct srcpos *pos, const char *prefix,
374 const char *fmt, va_list va)
375 {
376 char *srcstr;
377
378 srcstr = srcpos_string(pos);
379
380 fprintf(stderr, "%s: %s ", prefix, srcstr);
381 vfprintf(stderr, fmt, va);
382 fprintf(stderr, "\n");
383
384 free(srcstr);
385 }
386
srcpos_error(struct srcpos * pos,const char * prefix,const char * fmt,...)387 void srcpos_error(struct srcpos *pos, const char *prefix,
388 const char *fmt, ...)
389 {
390 va_list va;
391
392 va_start(va, fmt);
393 srcpos_verror(pos, prefix, fmt, va);
394 va_end(va);
395 }
396
srcpos_set_line(char * f,int l)397 void srcpos_set_line(char *f, int l)
398 {
399 current_srcfile->name = f;
400 current_srcfile->lineno = l;
401
402 if (initial_cpp) {
403 initial_cpp = false;
404 set_initial_path(f);
405 }
406 }
407
