71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
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/* Code to mangle pathnames into those matching a given prefix.
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eg. open("/lib/foo.so") => open("/usr/gnemul/i386-linux/lib/foo.so");
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The assumption is that this area does not change.
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*/
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#include "qemu/osdep.h"
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#include <sys/param.h>
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#include <dirent.h>
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#include "qemu/cutils.h"
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#include "qemu/path.h"
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#include "qemu/thread.h"
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static const char *base;
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static GHashTable *hash;
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static QemuMutex lock;
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void init_paths(const char *prefix)
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{
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if (prefix[0] == '\0' || !strcmp(prefix, "/")) {
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return;
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}
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if (prefix[0] == '/') {
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base = g_strdup(prefix);
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} else {
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char *cwd = g_get_current_dir();
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base = g_build_filename(cwd, prefix, NULL);
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g_free(cwd);
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}
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hash = g_hash_table_new(g_str_hash, g_str_equal);
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qemu_mutex_init(&lock);
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}
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/* Look for path in emulation dir, otherwise return name. */
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const char *path(const char *name)
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{
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gpointer key, value;
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const char *ret;
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/* Only do absolute paths: quick and dirty, but should mostly be OK. */
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if (!base || !name || name[0] != '/') {
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return name;
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}
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qemu_mutex_lock(&lock);
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/* Have we looked up this file before? */
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if (g_hash_table_lookup_extended(hash, name, &key, &value)) {
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ret = value ? value : name;
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} else {
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char *save = g_strdup(name);
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char *full = g_build_filename(base, name, NULL);
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/* Look for the path; record the result, pass or fail. */
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if (access(full, F_OK) == 0) {
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/* Exists. */
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g_hash_table_insert(hash, save, full);
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ret = full;
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} else {
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/* Does not exist. */
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g_free(full);
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g_hash_table_insert(hash, save, NULL);
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ret = name;
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}
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}
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qemu_mutex_unlock(&lock);
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return ret;
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}
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