summaryrefslogtreecommitdiff
path: root/scripts/dtc/srcpos.c
blob: f5205fb9c1ff16df6601d570d6c0020497ff046f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
 */

#define _GNU_SOURCE

#include <stdio.h>

#include "dtc.h"
#include "srcpos.h"

/* A node in our list of directories to search for source/include files */
struct search_path {
	struct search_path *next;	/* next node in list, NULL for end */
	const char *dirname;		/* name of directory to search */
};

/* This is the list of directories that we search for source files */
static struct search_path *search_path_head, **search_path_tail;

/* Detect infinite include recursion. */
#define MAX_SRCFILE_DEPTH     (100)
static int srcfile_depth; /* = 0 */

static char *get_dirname(const char *path)
{
	const char *slash = strrchr(path, '/');

	if (slash) {
		int len = slash - path;
		char *dir = xmalloc(len + 1);

		memcpy(dir, path, len);
		dir[len] = '\0';
		return dir;
	}
	return NULL;
}

FILE *depfile; /* = NULL */
struct srcfile_state *current_srcfile; /* = NULL */
static char *initial_path; /* = NULL */
static int initial_pathlen; /* = 0 */
static bool initial_cpp = true;

static void set_initial_path(char *fname)
{
	int i, len = strlen(fname);

	xasprintf(&initial_path, "%s", fname);
	initial_pathlen = 0;
	for (i = 0; i != len; i++)
		if (initial_path[i] == '/')
			initial_pathlen++;
}

static char *shorten_to_initial_path(char *fname)
{
	char *p1, *p2, *prevslash1 = NULL;
	int slashes = 0;

	for (p1 = fname, p2 = initial_path; *p1 && *p2; p1++, p2++) {
		if (*p1 != *p2)
			break;
		if (*p1 == '/') {
			prevslash1 = p1;
			slashes++;
		}
	}
	p1 = prevslash1 + 1;
	if (prevslash1) {
		int diff = initial_pathlen - slashes, i, j;
		int restlen = strlen(fname) - (p1 - fname);
		char *res;

		res = xmalloc((3 * diff) + restlen + 1);
		for (i = 0, j = 0; i != diff; i++) {
			res[j++] = '.';
			res[j++] = '.';
			res[j++] = '/';
		}
		strcpy(res + j, p1);
		return res;
	}
	return NULL;
}

/**
 * Try to open a file in a given directory.
 *
 * If the filename is an absolute path, then dirname is ignored. If it is a
 * relative path, then we look in that directory for the file.
 *
 * @param dirname	Directory to look in, or NULL for none
 * @param fname		Filename to look for
 * @param fp		Set to NULL if file did not open
 * @return allocated filename on success (caller must free), NULL on failure
 */
static char *try_open(const char *dirname, const char *fname, FILE **fp)
{
	char *fullname;

	if (!dirname || fname[0] == '/')
		fullname = xstrdup(fname);
	else
		fullname = join_path(dirname, fname);

	*fp = fopen(fullname, "rb");
	if (!*fp) {
		free(fullname);
		fullname = NULL;
	}

	return fullname;
}

/**
 * Open a file for read access
 *
 * If it is a relative filename, we search the full search path for it.
 *
 * @param fname	Filename to open
 * @param fp	Returns pointer to opened FILE, or NULL on failure
 * @return pointer to allocated filename, which caller must free
 */
static char *fopen_any_on_path(const char *fname, FILE **fp)
{
	const char *cur_dir = NULL;
	struct search_path *node;
	char *fullname;

	/* Try current directory first */
	assert(fp);
	if (current_srcfile)
		cur_dir = current_srcfile->dir;
	fullname = try_open(cur_dir, fname, fp);

	/* Failing that, try each search path in turn */
	for (node = search_path_head; !*fp && node; node = node->next)
		fullname = try_open(node->dirname, fname, fp);

	return fullname;
}

FILE *srcfile_relative_open(const char *fname, char **fullnamep)
{
	FILE *f;
	char *fullname;

	if (streq(fname, "-")) {
		f = stdin;
		fullname = xstrdup("<stdin>");
	} else {
		fullname = fopen_any_on_path(fname, &f);
		if (!f)
			die("Couldn't open \"%s\": %s\n", fname,
			    strerror(errno));
	}

	if (depfile)
		fprintf(depfile, " %s", fullname);

	if (fullnamep)
		*fullnamep = fullname;
	else
		free(fullname);

	return f;
}

void srcfile_push(const char *fname)
{
	struct srcfile_state *srcfile;

	if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
		die("Includes nested too deeply");

	srcfile = xmalloc(sizeof(*srcfile));

	srcfile->f = srcfile_relative_open(fname, &srcfile->name);
	srcfile->dir = get_dirname(srcfile->name);
	srcfile->prev = current_srcfile;

	srcfile->lineno = 1;
	srcfile->colno = 1;

	current_srcfile = srcfile;

	if (srcfile_depth == 1)
		set_initial_path(srcfile->name);
}

bool srcfile_pop(void)
{
	struct srcfile_state *srcfile = current_srcfile;

	assert(srcfile);

	current_srcfile = srcfile->prev;

	if (fclose(srcfile->f))
		die("Error closing \"%s\": %s\n", srcfile->name,
		    strerror(errno));

	/* FIXME: We allow the srcfile_state structure to leak,
	 * because it could still be referenced from a location
	 * variable being carried through the parser somewhere.  To
	 * fix this we could either allocate all the files from a
	 * table, or use a pool allocator. */

	return current_srcfile ? true : false;
}

void srcfile_add_search_path(const char *dirname)
{
	struct search_path *node;

	/* Create the node */
	node = xmalloc(sizeof(*node));
	node->next = NULL;
	node->dirname = xstrdup(dirname);

	/* Add to the end of our list */
	if (search_path_tail)
		*search_path_tail = node;
	else
		search_path_head = node;
	search_path_tail = &node->next;
}

void srcpos_update(struct srcpos *pos, const char *text, int len)
{
	int i;

	pos->file = current_srcfile;

	pos->first_line = current_srcfile->lineno;
	pos->first_column = current_srcfile->colno;

	for (i = 0; i < len; i++)
		if (text[i] == '\n') {
			current_srcfile->lineno++;
			current_srcfile->colno = 1;
		} else {
			current_srcfile->colno++;
		}

	pos->last_line = current_srcfile->lineno;
	pos->last_column = current_srcfile->colno;
}

struct srcpos *
srcpos_copy(struct srcpos *pos)
{
	struct srcpos *pos_new;
	struct srcfile_state *srcfile_state;

	if (!pos)
		return NULL;

	pos_new = xmalloc(sizeof(struct srcpos));
	assert(pos->next == NULL);
	memcpy(pos_new, pos, sizeof(struct srcpos));

	/* allocate without free */
	srcfile_state = xmalloc(sizeof(struct srcfile_state));
	memcpy(srcfile_state, pos->file, sizeof(struct srcfile_state));
	pos_new->file = srcfile_state;

	return pos_new;
}

struct srcpos *srcpos_extend(struct srcpos *pos, struct srcpos *newtail)
{
	struct srcpos *p;

	if (!pos)
		return newtail;

	for (p = pos; p->next != NULL; p = p->next);
	p->next = newtail;
	return pos;
}

char *
srcpos_string(struct srcpos *pos)
{
	const char *fname = "<no-file>";
	char *pos_str;

	if (pos->file && pos->file->name)
		fname = pos->file->name;


	if (pos->first_line != pos->last_line)
		xasprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
			  pos->first_line, pos->first_column,
			  pos->last_line, pos->last_column);
	else if (pos->first_column != pos->last_column)
		xasprintf(&pos_str, "%s:%d.%d-%d", fname,
			  pos->first_line, pos->first_column,
			  pos->last_column);
	else
		xasprintf(&pos_str, "%s:%d.%d", fname,
			  pos->first_line, pos->first_column);

	return pos_str;
}

static char *
srcpos_string_comment(struct srcpos *pos, bool first_line, int level)
{
	char *pos_str, *fname, *first, *rest;
	bool fresh_fname = false;

	if (!pos) {
		if (level > 1) {
			xasprintf(&pos_str, "<no-file>:<no-line>");
			return pos_str;
		} else {
			return NULL;
		}
	}

	if (!pos->file)
		fname = "<no-file>";
	else if (!pos->file->name)
		fname = "<no-filename>";
	else if (level > 1)
		fname = pos->file->name;
	else {
		fname = shorten_to_initial_path(pos->file->name);
		if (fname)
			fresh_fname = true;
		else
			fname = pos->file->name;
	}

	if (level > 1)
		xasprintf(&first, "%s:%d:%d-%d:%d", fname,
			  pos->first_line, pos->first_column,
			  pos->last_line, pos->last_column);
	else
		xasprintf(&first, "%s:%d", fname,
			  first_line ? pos->first_line : pos->last_line);

	if (fresh_fname)
		free(fname);

	if (pos->next != NULL) {
		rest = srcpos_string_comment(pos->next, first_line, level);
		xasprintf(&pos_str, "%s, %s", first, rest);
		free(first);
		free(rest);
	} else {
		pos_str = first;
	}

	return pos_str;
}

char *srcpos_string_first(struct srcpos *pos, int level)
{
	return srcpos_string_comment(pos, true, level);
}

char *srcpos_string_last(struct srcpos *pos, int level)
{
	return srcpos_string_comment(pos, false, level);
}

void srcpos_verror(struct srcpos *pos, const char *prefix,
		   const char *fmt, va_list va)
{
	char *srcstr;

	srcstr = srcpos_string(pos);

	fprintf(stderr, "%s: %s ", prefix, srcstr);
	vfprintf(stderr, fmt, va);
	fprintf(stderr, "\n");

	free(srcstr);
}

void srcpos_error(struct srcpos *pos, const char *prefix,
		  const char *fmt, ...)
{
	va_list va;

	va_start(va, fmt);
	srcpos_verror(pos, prefix, fmt, va);
	va_end(va);
}

void srcpos_set_line(char *f, int l)
{
	current_srcfile->name = f;
	current_srcfile->lineno = l;

	if (initial_cpp) {
		initial_cpp = false;
		set_initial_path(f);
	}
}