ching(6) -- The Book of Changes, not seen in BSD since 4.4BSD.

The C code is a complete rewrite done by Guy Harris for 4.4BSD and is
not the original from v7 at all. Unfortunately, the data file itself,
without which the rest isn't useful, was not freed until Caldera
released all of 32v a few years ago, so it was not in 4.4lite.

The data file, the ching nroff macros, and the driver script are under
Caldera or Caldera+Berkeley copyright.

I've partially redone the driver script from 4.4 (there was no point
in using a temporary file for the hexagram), which was already
partially redone from 32v. (As an aside, it is nutty that the script
needs a copyright so many times longer than the code.)

I've renamed "cno" to "castching", "phx" to "printching", (the
traditional names were opaque), and put them in /usr/libexec/ching
instead of the v7 /usr/games/ching.d. The data file and nroff macros
are in /usr/share/games/ching

1 files changed, 326 insertions, 0 deletions

diff --git a/ching/printching/printching.c b/ching/printching/printching.c
new file mode 100644
index 00000000..818ca96e
--- /dev/null
+++ b/ching/printching/printching.c
@@ -0,0 +1,326 @@
+/*	$NetBSD: printching.c,v 1.1 2005/06/30 13:30:33 perry Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Guy Harris.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)ching.phx.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: printching.c,v 1.1 2005/06/30 13:30:33 perry Exp $");
+#endif
+#endif /* not lint */
+
+/*
+ * printching - Print NROFF/TROFF source of change, given the line values.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "ching.h"
+#include "pathnames.h"
+
+int changes(void);
+int codem(int a);
+int doahex(void);
+void phx(int hexagram, int flag);
+
+struct {
+	int	lines;		/* encoded value of lines */
+	int	trinum;		/* trigram number */
+} table[] = {
+	{ 777, 0 },		/* 1 */
+	{ 887, 1 },		/* 4 */
+	{ 878, 2 },		/* 6 */
+	{ 788, 3 },		/* 7 */
+	{ 888, 4 },		/* 8 */
+	{ 778, 5 },		/* 5 */
+	{ 787, 6 },		/* 3 */
+	{ 877, 7 },		/* 2 */
+};
+
+/*
+ * Gives hexagram number from two component trigrams.
+ */
+int	crosstab[8][8] = {
+	{1,  34, 5,  26, 11, 9,  14, 43},
+	{25, 51, 3,  27, 24, 42, 21, 17},
+	{6,  40, 29, 4,  7,  59, 64, 47},
+	{33, 62, 39, 52, 15, 53, 56, 31},
+	{12, 16, 8,  23, 2,  20, 35, 45},
+	{44, 32, 48, 18, 46, 57, 50, 28},
+	{13, 55, 63, 22, 36, 37, 30, 49},
+	{10, 54, 60, 41, 19, 61, 38, 58}
+};
+
+int	trigrams[6];
+int	moving[6];
+
+FILE	*chingf;		/* stream to read the hexagram file */
+
+/*ARGSUSED*/
+int
+main(int argc, char **argv)
+{
+	char *hexptr;		/* pointer to string of lines */
+	char hexstr[6+1];	/* buffer for reading lines in */
+	int i;
+
+	if (argc < 2)
+		hexptr = fgets(hexstr, 6+1, stdin);
+	else
+		hexptr = argv[1];
+	if (hexptr == (char *)NULL || strlen(hexptr) != 6) {
+		fprintf(stderr, "What kind of a change is THAT?!?\n");
+		exit(1);
+	}
+	for (i = 0; i < 6; i++) {
+		trigrams[i] = hexptr[i] - '0';
+		if (trigrams[i] == 6 || trigrams[i] == 9)
+			moving[i] = 1;
+		else
+			moving[i] = 0;
+	}
+	if ((chingf = fopen(_PATH_HEX, "r")) == (FILE *)NULL) {
+		fprintf(stderr, "ching: can't read %s\n", _PATH_HEX);
+		exit(2);
+	}
+	phx(doahex(), 0);
+	if (changes())
+		phx(doahex(), 1);
+	exit(0);
+}
+
+/*
+ * Compute the hexagram number, given the trigrams.
+ */
+int
+doahex(void)
+{
+	int lower, upper;	/* encoded values of lower and upper trigrams */
+	int lnum, unum;		/* indices of upper and lower trigrams */
+	int i;
+
+	lower = codem(0);
+	upper = codem(3);
+	for (i = 0; i < 8; i++) {
+		if (table[i].lines == lower)
+			 lnum = table[i].trinum;
+		if (table[i].lines == upper)
+			 unum = table[i].trinum;
+	}
+	return(crosstab[lnum][unum]);
+}
+
+/*
+ * Encode a trigram as a 3-digit number; the digits, from left to right,
+ * represent the lines.  7 is a solid (yang) line, 8 is a broken (yin) line.
+ */
+int
+codem(int a)
+{
+	int code, i;
+	int factor[3];
+
+	factor[0] = 1;
+	factor[1] = 10;
+	factor[2] = 100;
+	code = 0;
+
+	for (i = a; i < a + 3; i++) {
+		switch(trigrams[i]) {
+
+		case YYANG:
+		case OYANG:
+			code += factor[i%3]*7;
+			break;
+
+		case OYIN:
+		case YYIN:
+			code += factor[i%3]*8;
+			break;
+		}
+	}
+	return(code);
+}
+
+/*
+ * Compute the changes based on moving lines; return 1 if any lines moved,
+ * 0 if no lines moved.
+ */
+int
+changes(void)
+{
+	int cflag;
+	int i;
+
+	cflag = 0;
+	for (i = 0; i < 6; i++) {
+		if (trigrams[i] == OYIN) {
+			trigrams[i] = YYANG;
+			cflag++;
+		} else if (trigrams[i] == OYANG) {
+			trigrams[i] = YYIN;
+			cflag++;
+		}
+	}
+	return(cflag);
+}
+
+/*
+ * Print the NROFF/TROFF source of a hexagram, given the hexagram number;
+ * if flag is 0, print the entire source; if flag is 1, ignore the meanings
+ * of the lines.
+ */
+void
+phx(int hexagram, int flag)
+{
+	char textln[128+1];		/* buffer for text line */
+	char *lp;			/* pointer into buffer */
+	int thishex;			/* number of hexagram just read */
+	int lineno;			/* number of line read in */
+	int allmoving;			/* 1 if all lines are moving */
+	int i;
+
+	/*
+	 * Search for the hexagram; it begins with a line of the form
+	 * .H <hexagram number> <other data>.
+	 */
+	rewind(chingf);
+	for (;;) {
+		if (fgets(textln, sizeof(textln), chingf) == (char *)NULL) {
+			fprintf(stderr, "ching: Hexagram %d missing\n",
+			    hexagram);
+			exit(3);
+		}
+		lp = &textln[0];
+		if (*lp++ != '.' || *lp++ != 'H')
+			continue;
+		while (*lp++ == ' ')
+			;
+		lp--;
+		thishex = atoi(lp);
+		if (thishex < 1 || thishex > 64)
+			continue;
+		if (thishex == hexagram)
+			break;
+	}
+
+	/*
+	 * Print up to the line commentary, which ends with a line of the form
+	 * .L <position> <value>
+	 */
+	fputs(textln, stdout);
+	for (;;) {
+		if (fgets(textln, sizeof(textln), chingf) == (char *)NULL) {
+			fprintf(stderr, "ching: Hexagram %d malformed\n",
+			    hexagram);
+			exit(3);
+		}
+		lp = &textln[0];
+		if (*lp++ == '.') {
+			if (*lp++ == 'L')
+				break;
+		}
+		fputs(textln, stdout);
+	}
+
+	/*
+	 * Now print the line commentaries, if this is the first hexagram.
+	 */
+	if (flag)
+		return;
+
+	/*
+	 * If a line is moving, print its commentary.
+	 * The text of the commentary ends with a line either of the form
+	 * .L <position> <value>
+	 * or of the form
+	 * .LA <value>
+	 * or of the form
+	 * .H <hexagram number> <other arguments>
+	 */
+	allmoving = 1;
+	for (i = 0; i < 6; i++) {
+		while (*lp++ == ' ')
+			;
+		lp--;
+		lineno = atoi(lp);
+		if (i + 1 != lineno) {
+			fprintf(stderr, "ching: Hexagram %d malformed\n",
+			    hexagram);
+			exit(3);
+		}
+		if (moving[i])
+			fputs(textln, stdout);
+		else
+			allmoving = 0;
+		for (;;) {
+			if (fgets(textln, sizeof(textln), chingf) == (char *)NULL)
+				break;
+			lp = &textln[0];
+			if (*lp++ == '.' && (*lp == 'L' || *lp == 'H')) {
+				lp++;
+				break;
+			}
+			if (moving[i])
+				fputs(textln, stdout);
+		}
+	}
+
+	/*
+	 * If all the lines are moving, print the commentary for that; it
+	 * ends with a line of the form
+	 * .H <hexagram number> <other arguments>
+	 */
+	if (*lp == 'A' && allmoving) {
+		fputs(textln, stdout);
+		for (;;) {
+			if (fgets(textln, sizeof(textln), chingf) == (char *)NULL)
+				break;
+			lp = &textln[0];
+			if (*lp++ == '.' || *lp++ == 'H')
+				break;
+			fputs(textln, stdout);
+		}
+	}
+}