Use an enum and named values for the steps in compile_line to make the logic easier to read.

src/libespeak-ng/compiledict.c

 	return output;
 }
 
+typedef enum
+{
+	LINE_PARSER_WORD = 0,
+	LINE_PARSER_END_OF_WORD = 1,
+	LINE_PARSER_MULTIPLE_WORDS = 2,
+	LINE_PARSER_END_OF_WORDS = 3,
+	LINE_PARSER_PRONUNCIATION = 4,
+	LINE_PARSER_END = 5,
+} LINE_PARSER_STATES;
+
 static int compile_line(char *linebuf, char *dict_line, int *hash)
 {
 	// Compile a line in the language_list file
 	char *word;
 	char *phonetic;
 	unsigned int ix;
-	int step;
+	LINE_PARSER_STATES step;
 	unsigned int n_flag_codes = 0;
 	int flagnum;
 	int flag_offset;
 
 	p = linebuf;
 
-	step = 0;
+	step = LINE_PARSER_WORD;
 
 	c = 0;
 	while (c != '\n') {
 
 		switch (step)
 		{
-		case 0:
+		case LINE_PARSER_WORD:
 			if (c == '(') {
 				multiple_words = 1;
 				word = p+1;
-				step = 1;
+				step = LINE_PARSER_END_OF_WORD;
 			} else if (!isspace2(c)) {
 				word = p;
-				step = 1;
+				step = LINE_PARSER_END_OF_WORD;
 			}
 			break;
-		case 1:
+		case LINE_PARSER_END_OF_WORD:
 			if ((c == '-') && multiple_words) {
 				if (IsDigit09(word[0]))
 					multiple_numeric_hyphen = 1;
 
 				if (multiple_words) {
 					multiple_string = multiple_string_end = p+1;
-					step = 2;
+					step = LINE_PARSER_MULTIPLE_WORDS;
 				} else
-					step = 3;
+					step = LINE_PARSER_END_OF_WORDS;
 			} else if (c == ')') {
 				if (multiple_words) {
 					p[0] = 0;
 					multiple_words = 0;
-					step = 3;
+					step = LINE_PARSER_END_OF_WORDS;
 				} else if (word[0] != '_') {
 					fprintf(f_log, "%5d: Missing '('\n", linenum);
 					error_count++;
-					step = 3;
+					step = LINE_PARSER_END_OF_WORDS;
 				}
 			}
 			break;
-		case 2:
+		case LINE_PARSER_MULTIPLE_WORDS:
 			if (isspace2(c))
 				multiple_words++;
 			else if (c == ')') {
 				p[0] = ' '; // terminate extra string
 				multiple_string_end = p+1;
-				step = 3;
+				step = LINE_PARSER_END_OF_WORDS;
 			}
 			break;
-		case 3:
+		case LINE_PARSER_END_OF_WORDS:
 			if (!isspace2(c)) {
 				phonetic = p;
-				step = 4;
+				step = LINE_PARSER_PRONUNCIATION;
 			}
 			break;
-		case 4:
+		case LINE_PARSER_PRONUNCIATION:
 			if (isspace2(c)) {
 				p[0] = 0; // terminate phonetic
-				step = 5;
+				step = LINE_PARSER_END;
 			}
 			break;
-		case 5:
+		case LINE_PARSER_END:
 			break;
 		}
 		p++;