Add utils/path.h with some path functions

Also use the path_normalize function after we open a file or when we
read the recent file history, so that even on windows we use / and not
\.

src/goxel.c

@@ -437,6 +437,7 @@ static void goxel_load_recent_files(void)
         if (strlen(path) < 1) continue;
         if (path[strlen(path) - 1] == '\n')
             path[strlen(path) - 1] = '\0';
+        if (!path_normalize(path)) continue;
         file = fopen(path, "r");
         if (!file) continue;
         fclose(file);

src/goxel.h

@@ -64,6 +64,7 @@
 #include "utils/geometry.h"
 #include "utils/gl.h"
 #include "utils/img.h"
+#include "utils/path.h"
 #include "utils/plane.h"
 #include "utils/sound.h"
 #include "utils/texture.h"

src/main.c

@@ -289,34 +289,6 @@ static void set_clipboard_text(void *user, const char *text)
     glfwSetClipboardString(window, text);
 }
 
-static void split_path_and_file(
-        const char *path_and_file,
-        char *path,
-        size_t path_size,
-        char *file,
-        size_t file_size)
-{
-    assert(path_and_file != NULL);
-    char *sep;
-    int path_len;
-
-    sep = strrchr(path_and_file, '/');
-    // Note: I would prefer to always use unix style paths.
-#ifdef WIN32
-    if (!sep) {
-        sep = strrchr(path_and_file, '\\');
-    }
-#endif
-    if (!sep) {
-        snprintf(file, file_size, "%s", path_and_file);
-        path[0] = '\0';
-    } else {
-        path_len = (int)(sep - path_and_file);
-        snprintf(path, path_size, "%.*s", path_len, path_and_file);
-        snprintf(file, file_size, "%s", sep + 1);
-    }
-}
-
 static void filters_to_nfd_spec(
         const char *const *filters, char buf[], size_t buf_size)
 {
@@ -360,16 +332,17 @@ static bool open_dialog(
     NFD_GetNativeWindowFromGLFWWindow(window, &nfd_window);
 
     if (flags & 1) { // Save dialog.
-        split_path_and_file(
-                default_path_and_file, default_path, sizeof(default_path),
-                default_name, sizeof(default_name));
+        path_dirname(default_path_and_file, default_path,
+                     sizeof(default_path));
+        path_basename(default_path_and_file, default_name,
+                      sizeof(default_name));
         err = NFD_SaveDialogU8_With(
                 &out_path,
                 &(nfdsavedialogu8args_t){
                     .filterList = &filter,
                     .filterCount = 1,
                     .defaultPath = default_path[0] ? default_path : NULL,
-                    .defaultName = default_name,
+                    .defaultName = default_name[0] ? default_name : NULL,
                     .parentWindow = nfd_window,
                 });
     } else {
@@ -386,6 +359,7 @@ static bool open_dialog(
     if (err == NFD_OKAY) {
         snprintf(buf, buf_size, "%s", out_path);
         free(out_path);
+        path_normalize(buf);
         return true;
     }
     return false;

src/utils/path.c

@@ -0,0 +1,76 @@
+/* Goxel 3D voxels editor
+ *
+ * copyright (c) 2024-present Guillaume Chereau <guillaume@noctua-software.com>
+ *
+ * Goxel is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+
+ * Goxel is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+
+ * You should have received a copy of the GNU General Public License along with
+ * goxel.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "path.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+char *path_dirname(const char *path, char *out, size_t size)
+{
+    char *sep;
+    int len;
+
+    assert(path);
+    assert(path != out);
+    sep = strrchr(path, '/');
+#ifdef WIN32
+    if (!sep) {
+        sep = strrchr(path, '\\');
+    }
+#endif
+    if (sep == NULL) {
+        out[0] = '\0';
+        return NULL;
+    }
+    len = (int)(sep - path);
+    snprintf(out, size, "%.*s", len, path);
+    return out;
+}
+
+char *path_basename(const char *path, char *out, size_t size)
+{
+    char *sep;
+    int len;
+
+    assert(path);
+    assert(path != out);
+    sep = strrchr(path, '/');
+#ifdef WIN32
+    if (!sep) {
+        sep = strrchr(path, '\\');
+    }
+#endif
+    if (sep == NULL) {
+        snprintf(out, size, "%s", path);
+        return out;
+    }
+    len = (int)(sep - path);
+    snprintf(out, size, "%s", path + len + 1);
+    return out;
+}
+
+bool path_normalize(char *path)
+{
+    int i;
+    for (i = 0; i < strlen(path); i++) {
+        if (path[i] == '\\') path[i] = '/';
+    }
+    return true;
+}

src/utils/path.h

@@ -0,0 +1,30 @@
+/* Goxel 3D voxels editor
+ *
+ * copyright (c) 2024-present Guillaume Chereau <guillaume@noctua-software.com>
+ *
+ * Goxel is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+
+ * Goxel is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+
+ * You should have received a copy of the GNU General Public License along with
+ * goxel.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Some utils functions to manipulate paths.
+ */
+
+#include <stdbool.h>
+#include <stddef.h>
+
+char *path_dirname(const char *path, char *out, size_t size);
+
+char *path_basename(const char *path, char *out, size_t size);
+
+bool path_normalize(char *path);