fen.c: code cleanup: separate parsing FEN and moves in 2 functions - chess-puzzles - chess puzzle book generator
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---
(DIR) commit 2f8f9b16e1834cdd577d590efc51be17f3013585
(DIR) parent 752c96801f72527cf5bc3faab7ad7d1d7889ddbf
(HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Thu, 21 Dec 2023 18:27:41 +0100
fen.c: code cleanup: separate parsing FEN and moves in 2 functions
Diffstat:
M TODO | 5 ++---
M fen.c | 148 +++++++++++++++++--------------
2 files changed, 85 insertions(+), 68 deletions(-)
---
(DIR) diff --git a/TODO b/TODO
@@ -1,6 +1,5 @@
-- code cleanup:
- - separate parsefen() function.
- - separate parsemoves() function.
+- stream_lichess.sh: lichess API: read FEN of start position, for chess 960
+chess variant.
- option for output for annotating moves in a human-like way (for screenreaders/espeak).
https://en.wikipedia.org/wiki/Portable_Game_Notation
(DIR) diff --git a/fen.c b/fen.c
@@ -444,63 +444,14 @@ showboard_ascii(void)
}
void
-usage(char *argv0)
-{
- fprintf(stderr, "usage: %s [-cCfF] [-o ascii|fen|svg|tty] [FEN] [moves]\n", argv0);
- exit(1);
-}
-
-int
-main(int argc, char *argv[])
+parsefen(const char *fen)
{
- const char *fen, *moves, *s, *output = "svg";
- int x, y, x2, y2, field, piece, takepiece;
- int i, j;
char square[3];
+ const char *s;
long l;
+ int x, y, field;
-#ifdef __OpenBSD__
- if (pledge("stdio", NULL) == -1)
- err(1, "pledge");
-#endif
-
- fen = "startpos";
- moves = "";
-
- for (i = 1; i < argc; i++) {
- if (argv[i][0] != '-')
- break;
-
- for (j = 1; argv[i][j]; j++) {
- switch (argv[i][j]) {
- case 'c': showcoords = 1; break;
- case 'C': showcoords = 0; break;
- case 'f': flipboard = 1; break;
- case 'F': flipboard = 0; break;
- case 'o':
- if (i + 1 >= argc)
- usage(argv[0]);
- output = argv[++i];
- goto next;
- default:
- usage(argv[0]);
- break;
- }
- }
-next:
- ;
- }
- if (i < argc) {
- fen = argv[i];
- i++;
- }
- if (i < argc) {
- moves = argv[i];
- i++;
- }
-
- if (!strcmp(fen, "startpos"))
- fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+ square[2] = '\0';
/* initial board state, FEN format */
x = y = field = 0;
@@ -547,7 +498,6 @@ next:
*(s + 1) >= '1' && *(s + 1) <= '6') {
square[0] = *s;
square[1] = *(s + 1);
- square[2] = '\0';
squaretoxy(square, &x, &y);
enpassantsquare[0] = x;
@@ -589,6 +539,14 @@ next:
continue;
}
}
+}
+
+void
+parsemoves(const char *moves)
+{
+ char square[3];
+ const char *s;
+ int i, x, y, x2, y2, piece, takepiece;
/* process moves */
square[2] = '\0';
@@ -634,10 +592,10 @@ next:
place(0, x2, y2); /* clear rook square */
} else if (x2 <= x - 2) { /* moved more than 1 square */
/* white: queenside castling: "e1c1" */
- for (j = x2 - 1; j > 0; j--) {
- if (getpiece(j, y2) == 'R') {
+ for (i = x2 - 1; i > 0; i--) {
+ if (getpiece(i, y2) == 'R') {
place('R', x2 + 1, y2); /* next to king */
- place(0, j, y2); /* clear rook square */
+ place(0, i, y2); /* clear rook square */
break;
}
}
@@ -664,21 +622,21 @@ next:
} else if (piece == 'k') {
black_can_castle[0] = black_can_castle[1] = 0;
} else if (piece == 'R' && y == 7) {
- for (j = 0; j < 7; j++) {
- if (getpiece(j, y) == 'K') {
- if (j < x)
+ for (i = 0; i < 7; i++) {
+ if (getpiece(i, y) == 'K') {
+ if (i < x)
white_can_castle[0] = 0;
- else if (j > x)
+ else if (i > x)
white_can_castle[1] = 0;
break;
}
}
} else if (piece == 'r' && y == 0) {
- for (j = 0; j < 7; j++) {
- if (getpiece(j, y) == 'k') {
- if (j > x)
+ for (i = 0; i < 7; i++) {
+ if (getpiece(i, y) == 'k') {
+ if (i > x)
black_can_castle[1] = 0;
- else if (j < x)
+ else if (i < x)
black_can_castle[0] = 0;
break;
}
@@ -728,6 +686,66 @@ next:
/* highlight last move */
highlightmove(x, y, x2, y2);
+}
+
+void
+usage(char *argv0)
+{
+ fprintf(stderr, "usage: %s [-cCfF] [-o ascii|fen|svg|tty] [FEN] [moves]\n", argv0);
+ exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+ const char *fen, *moves, *output = "svg";
+ int i, j;
+
+#ifdef __OpenBSD__
+ if (pledge("stdio", NULL) == -1)
+ err(1, "pledge");
+#endif
+
+ fen = "startpos";
+ moves = "";
+
+ for (i = 1; i < argc; i++) {
+ if (argv[i][0] != '-')
+ break;
+
+ for (j = 1; argv[i][j]; j++) {
+ switch (argv[i][j]) {
+ case 'c': showcoords = 1; break;
+ case 'C': showcoords = 0; break;
+ case 'f': flipboard = 1; break;
+ case 'F': flipboard = 0; break;
+ case 'o':
+ if (i + 1 >= argc)
+ usage(argv[0]);
+ output = argv[++i];
+ goto next;
+ default:
+ usage(argv[0]);
+ break;
+ }
+ }
+next:
+ ;
+ }
+ if (i < argc) {
+ fen = argv[i];
+ i++;
+ }
+ if (i < argc) {
+ moves = argv[i];
+ i++;
+ }
+
+ if (!strcmp(fen, "startpos"))
+ fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+
+ parsefen(fen);
+ parsemoves(moves);
if (!strcmp(output, "ascii"))
showboard_ascii();