Use -EISDIR instead of -2 in GetFileLength for directories.

src/libespeak-ng/readclause.c

 	}
 
 	length = GetFileLength(fname);
+	if (length < 0) { // length == -errno
+		fclose(f);
+		return create_file_error_context(context, -length, fname);
+	}
 	if (fseek(f, 0, SEEK_SET) == -1) {
 		int error = errno;
 		fclose(f);

src/libespeak-ng/speech.c

 	if (!path) return 0;
 
 	snprintf(path_home, sizeof(path_home), "%s/espeak-ng-data", path);
-	if (GetFileLength(path_home) == -2)
+	if (GetFileLength(path_home) == -EISDIR)
 		return 1;
 
 	if (!allow_directory)
 		return 0;
 
 	snprintf(path_home, sizeof(path_home), "%s", path);
-	return GetFileLength(path_home) == -2;
+	return GetFileLength(path_home) == -EISDIR;
 }
 
 #pragma GCC visibility push(default)
 		return 0;
 
 	if (S_ISDIR(statbuf.st_mode))
-		return -2; // a directory
+		return -EISDIR;
 
 	return statbuf.st_size;
 }

src/libespeak-ng/synth_mbrola.c

 	// read eSpeak's mbrola phoneme translation data, eg. en1_phtrans
 	sprintf(path, "%s/mbrola_ph/%s", path_home, phtrans);
 	size = GetFileLength(path);
+	if (size < 0) // size == -errno
+		return -size;
 	if ((f_in = fopen(path, "rb")) == NULL) {
 		int error = errno;
 		close_MBR();

src/libespeak-ng/synthdata.c

 
 	sprintf(buf, "%s%c%s", path_home, PATHSEP, fname);
 	length = GetFileLength(buf);
+	if (length < 0) // length == -errno
+		return create_file_error_context(context, -length, buf);
 
 	if ((f_in = fopen(buf, "rb")) == NULL)
 		return create_file_error_context(context, errno, buf);

src/libespeak-ng/voices.c

 #include "config.h"
 
 #include <ctype.h>
+#include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 		}
 
 		sprintf(buf, "%s/voices/%s", path_home, language);
-		if (GetFileLength(buf) == -2) {
+		if (GetFileLength(buf) == -EISDIR) {
 			// A subdirectory name has been specified.  List all the voices in that subdirectory
 			language[lang_len++] = PATHSEP;
 			language[lang_len] = 0;
 			sprintf(fname, "%s%c%s", path, PATHSEP, FindFileData.cFileName);
 			ftype = GetFileLength(fname);
 
-			if (ftype == -2) {
-				// a sub-sirectory
+			if (ftype == -EISDIR) {
+				// a sub-directory
 				GetVoices(fname);
 			} else if (ftype > 0) {
-				// a regular line, add it to the voices list
+				// a regular file, add it to the voices list
 				if ((f_voice = fopen(fname, "r")) == NULL)
 					continue;
 
 
 		ftype = GetFileLength(fname);
 
-		if (ftype == -2) {
-			// a sub-sirectory
+		if (ftype == -EISDIR) {
+			// a sub-directory
 			GetVoices(fname);
 		} else if (ftype > 0) {
-			// a regular line, add it to the voices list
+			// a regular file, add it to the voices list
 			if ((f_voice = fopen(fname, "r")) == NULL)
 				continue;