Fork http://bellard.org/tinyemu

fs.c

@@ -0,0 +1,104 @@
+/*
+ * Filesystem utilities
+ * 
+ * Copyright (c) 2016 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <assert.h>
+#include <stdarg.h>
+
+#include "cutils.h"
+#include "fs.h"
+
+FSFile *fs_dup(FSDevice *fs, FSFile *f)
+{
+    FSQID qid;
+    fs->fs_walk(fs, &f, &qid, f, 0, NULL);
+    return f;
+}
+
+FSFile *fs_walk_path1(FSDevice *fs, FSFile *f, const char *path,
+                      char **pname)
+{
+    const char *p;
+    char *name;
+    FSFile *f1;
+    FSQID qid;
+    int len, ret;
+    BOOL is_last, is_first;
+
+    if (path[0] == '/')
+        path++;
+    
+    is_first = TRUE;
+    for(;;) {
+        p = strchr(path, '/');
+        if (!p) {
+            name = (char *)path;
+            if (pname) {
+                *pname = name;
+                if (is_first) {
+                    ret = fs->fs_walk(fs, &f, &qid, f, 0, NULL);
+                    if (ret < 0)
+                        f = NULL;
+                }
+                return f;
+            }
+            is_last = TRUE;
+        } else {
+            len = p - path;
+            name = malloc(len + 1);
+            memcpy(name, path, len);
+            name[len] = '\0';
+            is_last = FALSE;
+        }
+        ret = fs->fs_walk(fs, &f1, &qid, f, 1, &name);
+        if (!is_last)
+            free(name);
+        if (!is_first)
+            fs->fs_delete(fs, f);
+        f = f1;
+        is_first = FALSE;
+        if (ret <= 0) {
+            fs->fs_delete(fs, f);
+            f = NULL;
+            break;
+        } else if (is_last) {
+            break;
+        }
+        path = p + 1;
+    }
+    return f;
+}
+
+FSFile *fs_walk_path(FSDevice *fs, FSFile *f, const char *path)
+{
+    return fs_walk_path1(fs, f, path, NULL);
+}
+
+void fs_end(FSDevice *fs)
+{
+    fs->fs_end(fs);
+    free(fs);
+}