xref: /openbmc/u-boot/scripts/dtc/srcpos.c (revision cd71b1d5)
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 }
298