db_map_new(): New function

4 files changed, 228 insertions, 0 deletions

diff --git a/src/level.c b/src/level.c
index 3738b7a..b68c85f 100644
--- a/src/level.c
+++ b/src/level.c
@@ -20,6 +20,7 @@
 #include <SDL.h>
 #include <stdlib.h>
 #include "level.h"
+#include "map.h"
 #include "output.h"
 
 struct db_level {
@@ -52,8 +53,15 @@ db_level_new(const char *game_id, const char *level_id, struct db_level *prev)
 int
 db_level_play(SDL_Renderer *renderer, struct db_level *level)
 {
+	struct db_map *map;
+
 	db_dbg("Playing %s/%s", level->game_id, level->level_id);
 
+	map = db_map_new(level->game_id, level->level_id);
+	if (map == NULL) {
+		return -1;
+	}
+
 	SDL_RenderClear(renderer);
 
 	return 0;
diff --git a/src/local.mk b/src/local.mk
index 4097da4..3d12bb4 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -15,6 +15,8 @@ dodge_balls_SOURCES += \
 	%reldir%/main-menu.c \
 	%reldir%/main-menu.h \
 	%reldir%/main.c \
+	%reldir%/map.c \
+	%reldir%/map.h \
 	%reldir%/output.c \
 	%reldir%/output.h \
 	%reldir%/util.c \
diff --git a/src/map.c b/src/map.c
new file mode 100644
index 0000000..01b9b10
--- /dev/null
+++ b/src/map.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls 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.
+ *
+ * Dodge Balls 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 Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <expat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "dirs.h"
+#include "map.h"
+#include "output.h"
+#include "xml.h"
+
+struct db_map {
+};
+
+static char *
+_db_map_path(const char *game_id, const char *file, const char *ext)
+{
+	const char *games_dir;
+	char       *path;
+
+	games_dir = db_get_games_dir();
+
+	path = malloc((strlen(games_dir) + strlen(game_id) + strlen(file) +
+				strlen(ext) + 3) * sizeof(*path));
+	if (path == NULL) {
+		db_err("Failed to allocate memory");
+		return NULL;
+	}
+
+	sprintf(path, "%s/%s/%s%s", games_dir, game_id, file, ext);
+
+	return path;
+}
+
+static void XMLCALL
+_db_tmx_invalid_end(void *pv, const char *name)
+{
+	XML_Parser p;
+
+	db_dbg("  </%s> (invalid)", name);
+
+	p = (XML_Parser) pv;
+
+	db_xml_unexpected_end_tag(p, name, "");
+}
+
+static void XMLCALL
+_db_tmx_invalid_start(void *pv, const char *name,
+		const char **attr __attribute__((__unused__)))
+{
+	XML_Parser p;
+
+	db_dbg("  <%s> (invalid)", name);
+
+	p = (XML_Parser) pv;
+
+	db_xml_node_push(p, NULL, _db_tmx_invalid_start,
+			_db_tmx_invalid_end, NULL);
+}
+
+static void XMLCALL
+_db_tmx_map_end(void *pv, const char *name)
+{
+	XML_Parser p;
+
+	db_dbg("  </%s> (map)", name);
+
+	p = (XML_Parser) pv;
+
+	if (db_xml_check_tag(name, "map")) {
+		db_xml_node_pop(p);
+	} else {
+		db_xml_unexpected_end_tag(p, name, "map");
+	}
+}
+
+static void XMLCALL
+_db_tmx_map_start(void *pv, const char *name,
+		const char **attr __attribute__((__unused__)))
+{
+	XML_Parser      p;
+	struct db_map *map;
+
+	db_dbg("  <%s> (map)", name);
+
+	p = (XML_Parser) pv;
+	map = db_xml_node_peek(p);
+
+	if (db_xml_check_tag(name, "map")) {
+		db_xml_node_push(p, map, _db_tmx_invalid_start,
+				_db_tmx_map_end, NULL);
+	} else {
+		db_xml_unexpected_start_tag(p, name, "map");
+	}
+}
+
+struct db_map *
+db_map_new(const char *game_id, const char *level_id)
+{
+	struct db_map   *map;
+	XML_Parser       p;
+	char            *path;
+	FILE            *fp;
+	void            *buf;
+	size_t           len;
+	enum XML_Status  status;
+
+	map = calloc(1, sizeof(*map));
+	if (map == NULL) {
+		db_err("Failed to allocate memory");
+		return NULL;
+	}
+
+	p = XML_ParserCreate(NULL);
+	if (p == NULL) {
+		free(map);
+		return NULL;
+	}
+	XML_UseParserAsHandlerArg(p);
+	db_xml_node_push(p, map, _db_tmx_map_start, _db_tmx_invalid_end, NULL);
+
+	path = _db_map_path(game_id, level_id, ".tmx");
+	if (path == NULL) {
+		db_xml_node_pop(p);
+		XML_ParserFree(p);
+		free(path);
+		free(map);
+		return NULL;
+	}
+
+	fp = fopen(path, "rb");
+	if (fp == NULL) {
+		db_xml_node_pop(p);
+		XML_ParserFree(p);
+		free(path);
+		free(map);
+		return NULL;
+	}
+
+	buf = XML_GetBuffer(p, 8192);
+	if (buf == NULL) {
+		db_xml_node_pop(p);
+		XML_ParserFree(p);
+		free(path);
+		fclose(fp);
+		free(map);
+		return NULL;
+	}
+
+	db_dbg("Parsing <%s>:", path);
+	free(path);
+
+	while (!feof(fp)) {
+		len = fread(buf, 1, 8192, fp);
+		status = XML_ParseBuffer(p, len, feof(fp));
+		if (status == XML_STATUS_OK) {
+			continue;
+		}
+		db_err("Failed to parse map information (%s)",
+				XML_ErrorString(XML_GetErrorCode(p)));
+		db_xml_node_pop(p);
+		XML_ParserFree(p);
+		fclose(fp);
+		free(map);
+		return NULL;
+	}
+
+	db_dbg("Parsing done");
+
+	db_xml_node_pop(p);
+	XML_ParserFree(p);
+	fclose(fp);
+
+	return map;
+}
diff --git a/src/map.h b/src/map.h
new file mode 100644
index 0000000..a8ef337
--- /dev/null
+++ b/src/map.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2021  P. J. McDermott
+ *
+ * This file is part of Dodge Balls
+ *
+ * Dodge Balls 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.
+ *
+ * Dodge Balls 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 Dodge Balls.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DB_MAP_H_
+#define DB_MAP_H_
+
+struct db_map;
+
+struct db_map *db_map_new(const char *game_id, const char *level_id);
+
+#endif  /* DB_MAP_H_ */