chess-puzzles

commit dab21427a28e5561843d56cb4de324cddd4c53c7
parent 30a2ab3dd2979115341beaedc6d4a4918541036a
Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date:   Wed, 20 Dec 2023 19:26:23 +0100

improve move number parsing

Diffstat:
M
fen_to_svg.c
 | 
15
+++++++++++----

1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/fen_to_svg.c b/fen_to_svg.c
@@ -1,3 +1,4 @@
+/* TODO: write some test-cases for parsing and output FEN */
 /* TODO: option to flip board? */
 
 #include <ctype.h>
@@ -420,7 +421,7 @@ main(int argc, char *argv[])
 
 	/* initial board state, FEN format */
 	x = y = field = 0;
-	for (s = fen; *s; s++) {
+	for (s = fen; *s && field < 6; s++) {
 		switch (field) {
 		case 0: /* piece placement data */
 			/* skip square */
@@ -478,7 +479,9 @@ main(int argc, char *argv[])
 			l = strtol(s, NULL, 10);
 			if (l >= 0 && l < 32767) {
 				halfmove = l;
-				s += strspn(s, "0123456789");
+
+				for (; *s && isdigit((unsigned char)*s); s++)
+					;
 			}
 			break;
 		case 5: /* move number */
@@ -487,11 +490,15 @@ main(int argc, char *argv[])
 
 			l = strtol(s, NULL, 10);
 			if (l >= 0 && l < 32767) {
-				movenumber = l;
-				s += strspn(s, "0123456789");
+				movenumber = (int)l;
+				for (; *s && isdigit((unsigned char)*s); s++)
+					;
 			}
 			break;
 		}
+		if (!*s)
+			break;
+
 		/* TODO: parse which side to move, en-passant, etc */
 
 		/* next field, fields are: piece placement data, active color,