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	do not use ctype functions - chess-puzzles - chess puzzle book generator
	git clone git://git.codemadness.org/chess-puzzles
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	---
	commit d30b443f23a15ffab12f6a00931d979b9cfab061
	parent 07c37ef3931e33b55aebe2561ed92d37735cabe8
	Author: Hiltjo Posthuma <[email protected]>
	Date: Sun, 9 Mar 2025 10:46:12 +0100

	do not use ctype functions

	These can be locale-specific on some platforms.

	Diffstat:
	M fen.c \| 23 ++++++++++++++---------

	1 file changed, 14 insertions(+), 9 deletions(-)
	---
	diff --git a/fen.c b/fen.c
	@@ -1,4 +1,3 @@
	-#include <ctype.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <stdlib.h>
	@@ -11,6 +10,12 @@

	#define LEN(s) (sizeof(s)/sizeof(*s))

	+/* ctype-like macros, but always compatible with ASCII / UTF-8 */
	+#define ISDIGIT(c) (((unsigned)c) - '0' < 10)
	+#define ISXDIGIT(c) ((((unsigned)c) - '0' < 10) \|\| ((unsigned)c \| 32) - 'a' < …
	+#define TOLOWER(c) ((((unsigned)c) - 'A' < 26) ? ((c) \| 32) : (c))
	+#define TOUPPER(c) ((((unsigned)c) - 'a' < 26) ? ((c) & 0x5f) : (c))
	+
	/* macro for truecolor RGB output to tty */
	#define SETFGCOLOR(r,g,b) printf("\x1b[38;2;%d;%d;%dm", r, g, b)
	#define SETBGCOLOR(r,g,b) printf("\x1b[48;2;%d;%d;%dm", r, g, b)
	@@ -238,7 +243,7 @@ speak(const char *fmt, ...)
	int
	pgnpiece(int piece)
	{
	- piece = toupper(piece);
	+ piece = TOUPPER(piece);

	/* no mapping */
	if (!pgn_piecemapping[0])
	@@ -554,7 +559,7 @@ output_tty(struct board *b)
	fputs("\x1b[30m", stdout); /* black */
	/* workaround: use black unicode chess symbol,…
	the color is filled and better visible */
	- showpiece_tty(tolower(piece));
	+ showpiece_tty(TOLOWER(piece));
	} else {
	fputs(" ", stdout);
	}
	@@ -1027,7 +1032,7 @@ board_setup_fen(struct board b, const char fen)
	if (l >= 0 && l < 32767) {
	b->halfmove = l;

	- for (; s && isdigit((unsigned char)s); s++)
	+ for (; s && ISDIGIT((unsigned char)s); s++)
	;
	}
	break;
	@@ -1038,7 +1043,7 @@ board_setup_fen(struct board b, const char fen)
	l = strtol(s, NULL, 10);
	if (l >= 0 && l < 32767) {
	b->movenumber = (int)l;
	- for (; s && isdigit((unsigned char)s); s++)
	+ for (; s && ISDIGIT((unsigned char)s); s++)
	;
	}
	break;
	@@ -1162,9 +1167,9 @@ board_playmoves(struct board b, const char moves)
	/* is a valid piece? should be queen, rook, bishop, knight (no…
	if (isvalidpiece(*s)) {
	if (side == 'w')
	- promote = toupper(*s);
	+ promote = TOUPPER(*s);
	else
	- promote = tolower(*s);
	+ promote = TOLOWER(*s);
	s++;
	}

	@@ -1450,8 +1455,8 @@ decodeparam(char buf, size_t bufsiz, const char s)
	case '%':
	if (i + 3 >= bufsiz)
	return -1;
	- if (!isxdigit((unsigned char)*(s+1)) \|\|
	- !isxdigit((unsigned char)*(s+2)))
	+ if (!ISXDIGIT((unsigned char)*(s+1)) \|\|
	+ !ISXDIGIT((unsigned char)*(s+2)))
	return -1;
	buf[i++] = hexdigit((s+1)) 16 + hexdigit(*(s+2));
	s += 2;