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/datadir.h"
  27 #include "qemu/cutils.h"
  28 #include "trace.h"
  29
  30 static const char *data_dir[16];
  31 static int data_dir_idx;
  32
  33 char *qemu_find_file(int type, const char *name)
  34 {
  35     int i;
  36     const char *subdir;
  37     char *buf;
  38
  39     /* Try the name as a straight path first */
  40     if (access(name, R_OK) == 0) {
  41         trace_load_file(name, name);
  42         return g_strdup(name);
  43     }
  44
  45     switch (type) {
  46     case QEMU_FILE_TYPE_BIOS:
  47         subdir = "";
  48         break;
  49     case QEMU_FILE_TYPE_KEYMAP:
  50         subdir = "keymaps/";
  51         break;
  52     default:
  53         abort();
  54     }
  55
  56     for (i = 0; i < data_dir_idx; i++) {
  57         buf = g_strdup_printf("%s/%s%s", data_dir[i], subdir, name);
  58         if (access(buf, R_OK) == 0) {
  59             trace_load_file(name, buf);
  60             return buf;
  61         }
  62         g_free(buf);
  63     }
  64     return NULL;
  65 }
  66
  67 void qemu_add_data_dir(char *path)
  68 {
  69     int i;
  70
  71     if (path == NULL) {
  72         return;
  73     }
  74     if (data_dir_idx == ARRAY_SIZE(data_dir)) {
  75         return;
  76     }
  77     for (i = 0; i < data_dir_idx; i++) {
  78         if (strcmp(data_dir[i], path) == 0) {
  79             g_free(path); /* duplicate */
  80             return;
  81         }
  82     }
  83     data_dir[data_dir_idx++] = path;
  84 }
  85
  86 /*
  87  * Find a likely location for support files using the location of the binary.
  88  * When running from the build tree this will be "$bindir/pc-bios".
  89  * Otherwise, this is CONFIG_QEMU_DATADIR (possibly relocated).
  90  *
  91  * The caller must use g_free() to free the returned data when it is
  92  * no longer required.
  93  */
  94 static char *find_datadir(void)
  95 {
  96     g_autofree char *dir = NULL;
  97
  98     dir = g_build_filename(qemu_get_exec_dir(), "pc-bios", NULL);
  99     if (g_file_test(dir, G_FILE_TEST_IS_DIR)) {
 100         return g_steal_pointer(&dir);
 101     }
 102
 103     return get_relocated_path(CONFIG_QEMU_DATADIR);
 104 }
 105
 106 void qemu_add_default_firmwarepath(void)
 107 {
 108     char **dirs;
 109     size_t i;
 110
 111     /* add configured firmware directories */
 112     dirs = g_strsplit(CONFIG_QEMU_FIRMWAREPATH, G_SEARCHPATH_SEPARATOR_S, 0);
 113     for (i = 0; dirs[i] != NULL; i++) {
 114         qemu_add_data_dir(get_relocated_path(dirs[i]));
 115     }
 116     g_strfreev(dirs);
 117
 118     /* try to find datadir relative to the executable path */
 119     qemu_add_data_dir(find_datadir());
 120 }
 121
 122 void qemu_list_data_dirs(void)
 123 {
 124     int i;
 125     for (i = 0; i < data_dir_idx; i++) {
 126         printf("%s\n", data_dir[i]);
 127     }
 128 }