fs: add vlc_mkdir_parent function that correspond to 'mkdir -p'

include/vlc_fs.h

@@ -275,6 +275,16 @@ VLC_API void vlc_rewinddir( vlc_DIR *dir );
  */
 VLC_API int vlc_mkdir(const char *dirname, mode_t mode);
 
+/**
+ * Creates a directory and parent directories as needed.
+ *
+ * @param dirname a UTF-8 string containing the name of the directory to
+ *        be created.
+ * @param mode directory permissions
+ * @return 0 on success, -1 on error (see errno).
+ */
+VLC_API int vlc_mkdir_parent(const char *dirname, mode_t mode);
+
 /**
  * Determines the current working directory.
  *

src/Makefile.am

@@ -385,6 +385,7 @@ libvlccore_la_SOURCES = \
 	misc/mtime.c \
 	misc/frame.c \
 	misc/fifo.c \
+	misc/filesystem.c \
 	misc/fourcc.c \
 	misc/fourcc_list.h \
 	misc/es_format.c \

src/libvlccore.sym

@@ -459,6 +459,7 @@ utf8_fprintf
 vlc_loaddir
 vlc_lstat
 vlc_mkdir
+vlc_mkdir_parent
 vlc_mkstemp
 vlc_open
 vlc_openat

src/meson.build

@@ -236,6 +236,7 @@ libvlccore_sources_base = files(
     'misc/mtime.c',
     'misc/frame.c',
     'misc/fifo.c',
+    'misc/filesystem.c',
     'misc/fourcc.c',
     'misc/fourcc_list.h',
     'misc/es_format.c',

src/misc/filesystem.c

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*****************************************************************************
+ * filesystem.c: filesystem helpers
+ *****************************************************************************
+ * Copyright © 2024 VLC authors, VideoLAN and Videolabs
+ *
+ * Authors: Gabriel Lafond Thenaille <gabriel@videolabs.io>
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_fs.h>
+
+/**
+ * Create all directories in the given path if missing.
+ */
+int vlc_mkdir_parent(const char *dirname, mode_t mode)
+{
+    int ret = vlc_mkdir(dirname, mode);
+    if (ret == 0 || errno == EEXIST) {
+        return 0;
+    } else if (errno != ENOENT) {
+        return -1;
+    }
+
+    char *path = strdup(dirname);
+    if (path == NULL) {
+        return -1;
+    }
+
+    char *ptr = path + 1;
+    while (*ptr) {
+        ptr = strchr(ptr, DIR_SEP_CHAR);
+        if (ptr == NULL) {
+            break;
+        }
+        *ptr = '\0';
+        if (vlc_mkdir(path, mode) != 0) {
+            if (errno != EEXIST) {
+                free(path);
+                return -1;
+            }
+        }
+        *ptr = DIR_SEP_CHAR;
+        ptr++;
+    }
+    ret = vlc_mkdir(path, mode);
+    if (errno == EEXIST) {
+        ret = 0;
+    }
+    free(path);
+    return ret;
+}