QE/LE: Handle backslashes in filenames

Rance 5D uses filename `Save\\Rance5dSystem.asd`. This caused issues:

- On Windows, saving would fail if the `Save` directory did not exist.
- On other platforms, files were created with literal backslashes in
  their names.

This change addresses these problems by:

- In commandQE, normalizing backslashes to forward slashes in the path
  and ensuring that the target directory exists by calling mkdir_p().
- In commandLE, first attempting to load files with normalized forward
  slashes. If that fails, it retries with the original path (containing
  backslashes) for compatibility with older saves.

src/cmdl.c

@@ -110,21 +110,35 @@ void commandLT() {
 void commandLE(char terminator) {
 	int type = sl_getc();
 	const char *filename = sl_getString(terminator);
+	char *fname_utf8 = toUTF8(filename);
+	char *fallback_fname = NULL;
+	if (strchr(fname_utf8, '\\')) {
+		fallback_fname = strdup(fname_utf8);
+		for (char *p = fname_utf8; *p; p++) {
+			if (*p == '\\')
+				*p = '/';
+		}
+	}
+
 	int var, cnt;
 	struct VarRef vref;
-
-	char *fname_utf8 = toUTF8(filename);
 	switch (type) {
 	case 0:
 		getCaliArray(&vref);
 		var = vref.var;
 		cnt = getCaliValue();
 		sysVar[0] = load_vars_from_file(fname_utf8, &vref, cnt);
+		// For compatibility; the QE command in v2.16.1 and earlier did not
+		// convert backslashes to slashes.
+		if (sysVar[0] == SAVE_LOADERR && fallback_fname)
+			sysVar[0] = load_vars_from_file(fallback_fname, &vref, cnt);
 		break;
 	case 1:
 		var = getCaliValue();
 		cnt = getCaliValue();
 		sysVar[0] = load_strs_from_file(fname_utf8, var, cnt);
+		if (sysVar[0] == SAVE_LOADERR && fallback_fname)
+			sysVar[0] = load_strs_from_file(fallback_fname, var, cnt);
 		break;
 	default:
 		var = getCaliValue();
@@ -132,6 +146,8 @@ void commandLE(char terminator) {
 		WARNING("Unknown LE command %d", type);
 		break;
 	}
+	if (fallback_fname)
+		free(fallback_fname);
 	free(fname_utf8);
 	
 	TRACE("LE %d,%s,%d,%d:",type, filename, var, cnt);

src/cmdq.c

@@ -29,6 +29,7 @@
 #include "scenario.h"
 #include "savedata.h"
 #include "utfsjis.h"
+#include "filecheck.h"
 #include "cmd_check.h"
 
 void commandQD() {
@@ -83,10 +84,22 @@ void commandQC() {
 void commandQE(char terminator) {
 	int type = sl_getc();
 	const char *filename = sl_getString(terminator);
+	char *fname_utf8 = toUTF8(filename);
+	char *last_slash = NULL;
+	for (char *p = fname_utf8; *p; p++) {
+		if (*p == '\\') {
+			*p = '/';
+			last_slash = p;
+		}
+	}
+	if (last_slash) {
+		*last_slash = '\0';
+		mkdir_p(fname_utf8);
+		*last_slash = '/';
+	}
+
 	int var, cnt;
 	struct VarRef vref;
-
-	char *fname_utf8 = toUTF8(filename);
 	switch (type) {
 	case 0:
 		getCaliArray(&vref);

src/filecheck.c

@@ -67,28 +67,28 @@ static int make_dir(const char *path)
 #endif
 
 // Adapted from http://stackoverflow.com/a/2336245/119527
-static int mkdir_p(const char *path)
+int mkdir_p(const char *path_utf8)
 {
-	const size_t len = strlen(path);
-	char _path[PATH_MAX];
+	const size_t len = strlen(path_utf8);
+	char path[PATH_MAX];
 	char *p;
 
 	errno = 0;
 
 	// Copy string so its mutable
-	if (len > sizeof(_path)-1) {
+	if (len > sizeof(path)-1) {
 		errno = ENAMETOOLONG;
 		return -1;
 	}
-	strcpy(_path, path);
+	strcpy(path, path_utf8);
 
 	// Iterate the string
-	for (p = _path + 1; *p; p++) {
+	for (p = path + 1; *p; p++) {
 		if (*p == '/') {
 			// Temporarily truncate
 			*p = '\0';
 
-			if (make_dir(_path) != 0) {
+			if (make_dir(path) != 0) {
 				if (errno != EEXIST)
 					return -1;
 			}
@@ -97,7 +97,7 @@ static int mkdir_p(const char *path)
 		}
 	}
 
-	if (make_dir(_path) != 0) {
+	if (make_dir(path) != 0) {
 		if (errno != EEXIST)
 			return -1;
 	}

src/filecheck.h

@@ -31,5 +31,6 @@ char *fc_get_path(const char *fname_utf8);
 bool fc_exists(const char *fname_utf8);
 FILE *fc_open(const char *fname_utf8, char type);
 void fc_backup_oldfile(const char *filename);
+int mkdir_p(const char *path_utf8);
 
 #endif /* !__FILECHECK_H__ */