softmmu/datadir.c

   1 /*
   2  * QEMU firmware and keymap file search
   3  *
   4  * Copyright (c) 2003-2020 QEMU contributors
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu-common.h"
  27 #include "qemu/datadir.h"
  28 #include "qemu/cutils.h"
  29 #include "trace.h"
  30
  31 static const char *data_dir[16];
  32 static int data_dir_idx;
  33
  34 char *qemu_find_file(int type, const char *name)
  35 {
  36     int i;
  37     const char *subdir;
  38     char *buf;
  39
  40     /* Try the name as a straight path first */
  41     if (access(name, R_OK) == 0) {
  42         trace_load_file(name, name);
  43         return g_strdup(name);
  44     }
  45
  46     switch (type) {
  47     case QEMU_FILE_TYPE_BIOS:
  48         subdir = "";
  49         break;
  50     case QEMU_FILE_TYPE_KEYMAP:
  51         subdir = "keymaps/";
  52         break;
  53     default:
  54         abort();
  55     }
  56
  57     for (i = 0; i < data_dir_idx; i++) {
  58         buf = g_strdup_printf("%s/%s%s", data_dir[i], subdir, name);
  59         if (access(buf, R_OK) == 0) {
  60             trace_load_file(name, buf);
  61             return buf;
  62         }
  63         g_free(buf);
  64     }
  65     return NULL;
  66 }
  67
  68 void qemu_add_data_dir(char *path)
  69 {
  70     int i;
  71
  72     if (path == NULL) {
  73         return;
  74     }
  75     if (data_dir_idx == ARRAY_SIZE(data_dir)) {
  76         return;
  77     }
  78     for (i = 0; i < data_dir_idx; i++) {
  79         if (strcmp(data_dir[i], path) == 0) {
  80             g_free(path); /* duplicate */
  81             return;
  82         }
  83     }
  84     data_dir[data_dir_idx++] = path;
  85 }
  86
  87 /*
  88  * Find a likely location for support files using the location of the binary.
  89  * When running from the build tree this will be "$bindir/pc-bios".
  90  * Otherwise, this is CONFIG_QEMU_DATADIR (possibly relocated).
  91  *
  92  * The caller must use g_free() to free the returned data when it is
  93  * no longer required.
  94  */
  95 static char *find_datadir(void)
  96 {
  97     g_autofree char *dir = NULL;
  98
  99     dir = g_build_filename(qemu_get_exec_dir(), "pc-bios", NULL);
 100     if (g_file_test(dir, G_FILE_TEST_IS_DIR)) {
 101         return g_steal_pointer(&dir);
 102     }
 103
 104     return get_relocated_path(CONFIG_QEMU_DATADIR);
 105 }
 106
 107 void qemu_add_default_firmwarepath(void)
 108 {
 109     char **dirs;
 110     size_t i;
 111
 112     /* add configured firmware directories */
 113     dirs = g_strsplit(CONFIG_QEMU_FIRMWAREPATH, G_SEARCHPATH_SEPARATOR_S, 0);
 114     for (i = 0; dirs[i] != NULL; i++) {
 115         qemu_add_data_dir(get_relocated_path(dirs[i]));
 116     }
 117     g_strfreev(dirs);
 118
 119     /* try to find datadir relative to the executable path */
 120     qemu_add_data_dir(find_datadir());
 121 }
 122
 123 void qemu_list_data_dirs(void)
 124 {
 125     int i;
 126     for (i = 0; i < data_dir_idx; i++) {
 127         printf("%s\n", data_dir[i]);
 128     }
 129 }