add_sound_mapping cleanup

- avoid several buffer overflows
- move use of access() to files.c in new can_read_file() function
- remove extra newlines in raw_print() calls
- get ready for lint, eg sprintf -> Sprintf
- generally make the code look like core code, not Qt code

include/extern.h

@@ -630,6 +630,9 @@ E void FDECL(compress, (const char *));
 E void FDECL(uncompress, (const char *));
 E boolean FDECL(lock_file, (const char *,int,int));
 E void FDECL(unlock_file, (const char *));
+#ifdef USER_SOUNDS
+E boolean FDECL(can_read_file, (const char *));
+#endif
 E void FDECL(read_config_file, (const char *));
 E void FDECL(check_recordfile, (const char *));
 #if defined(WIZARD)
@@ -1793,7 +1796,9 @@ E void FDECL(yelp, (struct monst *));
 E void FDECL(whimper, (struct monst *));
 E void FDECL(beg, (struct monst *));
 E int NDECL(dotalk);
-
+#ifdef USER_SOUNDS
+E int FDECL(add_sound_mapping, (const char *));
+#endif
 
 /* ### sys/msdos/sound.c ### */
 

src/files.c

@@ -103,7 +103,6 @@ static int lockptr;
 #endif
 
 #ifdef USER_SOUNDS
-extern int FDECL(add_sound_mapping, (const char* mapping));
 extern char *sounddir;
 #endif
 
@@ -1523,6 +1522,15 @@ char		*tmp_levels;
 	return 1;
 }
 
+#ifdef USER_SOUNDS
+boolean
+can_read_file(filename)
+const char *filename;
+{
+	return (access(filename, 4) == 0);
+}
+#endif /* USER_SOUNDS */
+
 void
 read_config_file(filename)
 const char *filename;

src/sounds.c

@@ -918,63 +918,65 @@ extern void FDECL(play_usersound, (const char*, int));
 
 typedef struct audio_mapping_rec {
 	struct re_pattern_buffer regex;
-	char* filename;
+	char *filename;
 	int volume;
-	struct audio_mapping_rec* next;
+	struct audio_mapping_rec *next;
 } audio_mapping;
 
-static audio_mapping* soundmap=0;
+static audio_mapping *soundmap = 0;
 
-char* sounddir=".";
+char* sounddir = ".";
 
+/* adds a sound file mapping, returns 0 on failure, 1 on success */
 int
 add_sound_mapping(mapping)
-const char* mapping;
+const char *mapping;
 {
 	char text[256];
 	char filename[256];
 	char filespec[256];
 	int volume;
 
-	if (sscanf(mapping, "MESG \"%[^\"]\"%*[\t ]\"%[^\"]\" %d",
-		text, filename, &volume)==3)
-	{
-		const char* err;
-		audio_mapping* new_map;
+	if (sscanf(mapping, "MESG \"%255[^\"]\"%*[\t ]\"%255[^\"]\" %d",
+		   text, filename, &volume) == 3) {
+	    const char *err;
+	    audio_mapping *new_map;
 
-		sprintf(filespec,"%s/%s",sounddir,filename);
+	    if (strlen(sounddir) + strlen(filename) > 254) {
+		raw_print("sound file name too long");
+		return 0;
+	    }
+	    Sprintf(filespec, "%s/%s", sounddir, filename);
 
-		if (access(filespec, R_OK)==0) {
-			new_map=(audio_mapping*)alloc(sizeof(audio_mapping));
-			new_map->regex.translate=0;
-			new_map->regex.fastmap=0;
-			new_map->regex.buffer=0;
-			new_map->regex.allocated=0;
-			new_map->regex.regs_allocated=REGS_FIXED;
-			new_map->filename=strdup(filespec);
-			new_map->volume=volume;
-			new_map->next=soundmap;
+	    if (can_read_file(filespec)) {
+		new_map = (audio_mapping *)alloc(sizeof(audio_mapping));
+		new_map->regex.translate = 0;
+		new_map->regex.fastmap = 0;
+		new_map->regex.buffer = 0;
+		new_map->regex.allocated = 0;
+		new_map->regex.regs_allocated = REGS_FIXED;
+		new_map->filename = strdup(filespec);
+		new_map->volume = volume;
+		new_map->next = soundmap;
 
-			err=re_compile_pattern(text, strlen(text), &new_map->regex);
+		err = re_compile_pattern(text, strlen(text), &new_map->regex);
 
-			if (err) {
-				sprintf(text, "%s\n", err);
-				raw_print(text);
-				free(new_map->filename);
-				free(new_map);
-				return 0;
-			} else {
-				soundmap=new_map;
-			}
+		if (err) {
+		    raw_print(err);
+		    free(new_map->filename);
+		    free(new_map);
+		    return 0;
 		} else {
-			sprintf(text, "%s not readable.\n", filespec);
-			raw_print(text);
-			return 0;
+		    soundmap = new_map;
 		}
-	} else {
-		sprintf(text, "syntax error in SOUND\n");
+	    } else {
+		Sprintf(text, "cannot read %.243s", filespec);
 		raw_print(text);
 		return 0;
+	    }
+	} else {
+	    raw_print("syntax error in SOUND");
+	    return 0;
 	}
 
 	return 1;
@@ -984,13 +986,13 @@ void
 play_sound_for_message(msg)
 const char* msg;
 {
-	audio_mapping* cursor=soundmap;
+	audio_mapping* cursor = soundmap;
 
 	while (cursor) {
-		if (re_search(&cursor->regex, msg, strlen(msg), 0, 9999, 0)>=0) {
-			play_usersound(cursor->filename, cursor->volume);
-		}
-		cursor=cursor->next;
+	    if (re_search(&cursor->regex, msg, strlen(msg), 0, 9999, 0) >= 0) {
+		play_usersound(cursor->filename, cursor->volume);
+	    }
+	    cursor = cursor->next;
 	}
 }