Huge savedata driver refactor

bdk/libs/nx_savedata/path_parser.c

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2019-2020 shchmue
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ISC License
+
+hactool Copyright (c) 2018, SciresM
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "path_parser.h"
+
+#include <gfx_utils.h>
+
+#include <string.h>
+
+bool save_path_parser_init(path_parser_ctx_t *ctx, const char *path) {
+    ctx->path_len = strlen(path);
+
+    if (ctx->path_len < 1 || path[0] != '/') {
+        EPRINTF("Path must begin with a '/'!");
+        return false;
+    }
+
+    ctx->_path = path;
+    ctx->_offset = 0;
+    ctx->_length = 0;
+    ctx->_finished = ctx->path_len == 1 || path[1] == '\0';
+    return true;
+}
+
+bool save_path_parser_move_next(path_parser_ctx_t *ctx) {
+    if (ctx->_finished)
+        return false;
+
+    ctx->_offset = ctx->_offset + ctx->_length + 1;
+    uint32_t end = ctx->_offset;
+
+    while (end < ctx->path_len && ctx->_path[end] != '\0' && ctx->_path[end] != '/')
+        end++;
+
+    ctx->_finished = end + 1 >= ctx->path_len || ctx->_path[end + 1] == '\0';
+    ctx->_length = end - ctx->_offset;
+
+    return true;
+}
+
+const char *save_path_parser_get_current(path_parser_ctx_t *ctx, uint32_t *out_len) {
+    if (out_len)
+        *out_len = ctx->_length;
+    return &ctx->_path[ctx->_offset];
+}
+
+bool save_path_parser_try_get_next(path_parser_ctx_t *ctx, char *name) {
+    bool success = save_path_parser_move_next(ctx);
+    uint32_t current_len = 0;
+    const char *current = save_path_parser_get_current(ctx, &current_len);
+    memcpy(name, current, current_len);
+    return success;
+}