1/* Utility functions for finding files relative to GCC binaries.
2 Copyright (C) 1992-2017 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3. If not see
18<http://www.gnu.org/licenses/>. */
19
20#include "config.h"
21#include "system.h"
22#include "filenames.h"
23#include "file-find.h"
24
25static bool debug = false;
26
27void
28find_file_set_debug (bool debug_state)
29{
30 debug = debug_state;
31}
32
33char *
34find_a_file (struct path_prefix *pprefix, const char *name, int mode)
35{
36 char *temp;
37 struct prefix_list *pl;
38 int len = pprefix->max_len + strlen (name) + 1;
39
40 if (debug)
41 fprintf (stderr, "Looking for '%s'\n", name);
42
43#ifdef HOST_EXECUTABLE_SUFFIX
44 len += strlen (HOST_EXECUTABLE_SUFFIX);
45#endif
46
47 temp = XNEWVEC (char, len);
48
49 /* Determine the filename to execute (special case for absolute paths). */
50
51 if (IS_ABSOLUTE_PATH (name))
52 {
53 if (access (name, mode) == 0)
54 {
55 strcpy (temp, name);
56
57 if (debug)
58 fprintf (stderr, " - found: absolute path\n");
59
60 return temp;
61 }
62
63#ifdef HOST_EXECUTABLE_SUFFIX
64 /* Some systems have a suffix for executable files.
65 So try appending that. */
66 strcpy (temp, name);
67 strcat (temp, HOST_EXECUTABLE_SUFFIX);
68
69 if (access (temp, mode) == 0)
70 return temp;
71#endif
72
73 if (debug)
74 fprintf (stderr, " - failed to locate using absolute path\n");
75 }
76 else
77 for (pl = pprefix->plist; pl; pl = pl->next)
78 {
79 struct stat st;
80
81 strcpy (temp, pl->prefix);
82 strcat (temp, name);
83
84 if (stat (temp, &st) >= 0
85 && ! S_ISDIR (st.st_mode)
86 && access (temp, mode) == 0)
87 return temp;
88
89#ifdef HOST_EXECUTABLE_SUFFIX
90 /* Some systems have a suffix for executable files.
91 So try appending that. */
92 strcat (temp, HOST_EXECUTABLE_SUFFIX);
93
94 if (stat (temp, &st) >= 0
95 && ! S_ISDIR (st.st_mode)
96 && access (temp, mode) == 0)
97 return temp;
98#endif
99 }
100
101 if (debug && pprefix->plist == NULL)
102 fprintf (stderr, " - failed: no entries in prefix list\n");
103
104 free (temp);
105 return 0;
106}
107
108/* Add an entry for PREFIX to prefix list PREFIX.
109 Add at beginning if FIRST is true. */
110
111void
112do_add_prefix (struct path_prefix *pprefix, const char *prefix, bool first)
113{
114 struct prefix_list *pl, **prev;
115 int len;
116
117 if (pprefix->plist && !first)
118 {
119 for (pl = pprefix->plist; pl->next; pl = pl->next)
120 ;
121 prev = &pl->next;
122 }
123 else
124 prev = &pprefix->plist;
125
126 /* Keep track of the longest prefix. */
127
128 len = strlen (prefix);
129 if (len > pprefix->max_len)
130 pprefix->max_len = len;
131
132 pl = XNEW (struct prefix_list);
133 pl->prefix = xstrdup (prefix);
134
135 if (*prev)
136 pl->next = *prev;
137 else
138 pl->next = (struct prefix_list *) 0;
139 *prev = pl;
140}
141
142/* Add an entry for PREFIX at the end of prefix list PREFIX. */
143
144void
145add_prefix (struct path_prefix *pprefix, const char *prefix)
146{
147 do_add_prefix (pprefix, prefix, false);
148}
149
150/* Add an entry for PREFIX at the begin of prefix list PREFIX. */
151
152void
153add_prefix_begin (struct path_prefix *pprefix, const char *prefix)
154{
155 do_add_prefix (pprefix, prefix, true);
156}
157
158/* Take the value of the environment variable ENV, break it into a path, and
159 add of the entries to PPREFIX. */
160
161void
162prefix_from_env (const char *env, struct path_prefix *pprefix)
163{
164 const char *p;
165 p = getenv (env);
166
167 if (p)
168 prefix_from_string (p, pprefix);
169}
170
171void
172prefix_from_string (const char *p, struct path_prefix *pprefix)
173{
174 const char *startp, *endp;
175 char *nstore = XNEWVEC (char, strlen (p) + 3);
176
177 if (debug)
178 fprintf (stderr, "Convert string '%s' into prefixes, separator = '%c'\n", p, PATH_SEPARATOR);
179
180 startp = endp = p;
181 while (1)
182 {
183 if (*endp == PATH_SEPARATOR || *endp == 0)
184 {
185 strncpy (nstore, startp, endp-startp);
186 if (endp == startp)
187 {
188 strcpy (nstore, "./");
189 }
190 else if (! IS_DIR_SEPARATOR (endp[-1]))
191 {
192 nstore[endp-startp] = DIR_SEPARATOR;
193 nstore[endp-startp+1] = 0;
194 }
195 else
196 nstore[endp-startp] = 0;
197
198 if (debug)
199 fprintf (stderr, " - add prefix: %s\n", nstore);
200
201 add_prefix (pprefix, nstore);
202 if (*endp == 0)
203 break;
204 endp = startp = endp + 1;
205 }
206 else
207 endp++;
208 }
209 free (nstore);
210}
211