2  * SPDX-License-Identifier: BSD-3-Clause
4  * Copyright (c) 1995-2022 Wolfram Schneider <wosch@FreeBSD.org>
46  *		offset differential count byte followed by a partially bigram-
47  *		encoded ascii residue.  A bigram is a two-character sequence,
60  *	0-28	likeliest differential counts + offset to make nonnegative
61  *	30	switch code for out-of-range count to follow in next word
63  *	128-255 bigram codes (128 most common, as determined by 'updatedb')
64  *	32-127  single character (printable) ascii residue (ie, literal)
67  * and NUL ('\0'). The 8-bit character support don't wast extra
76  *              8-bit file names characters: 
104 	u_char *cp, *oldpath, *path;  in main()  local
109 	while ((ch = getopt(argc, argv, "")) != -1)  in main()
114 	argc -= optind;  in main()
123 	/* First copy bigram array to stdout. */  in main()
129 	if (fwrite(bigrams, 1, BGBUFSIZE, stdout) != BGBUFSIZE)  in main()
130 		err(1, "stdout");  in main()
136 			big[i][j] = -1;  in main()
142 	path = buf2;  in main()
145 	while (fgets(path, sizeof(buf2), stdin) != NULL) {  in main()
148 		if (*path == '\n')  in main()
152 		for (cp = path; *cp != '\0'; cp++) {  in main()
159 		for (cp = path; *cp == *oldpath; cp++, oldpath++)  in main()
163 		count = cp - path;  in main()
164 		diffcount = count - oldcount + OFFSET;  in main()
168 			    putw(diffcount, stdout) == EOF)  in main()
169 				err(1, "stdout");  in main()
172 				err(1, "stdout");  in main()
177 			if ((code = BGINDEX(cp)) != -1) {  in main()
184 					err(1, "stdout");  in main()
198 							err(1, "stdout");  in main()
204 							err(1, "stdout");  in main()
211 		if (path == buf1) {		/* swap pointers */  in main()
212 			path = buf2;  in main()
215 			path = buf1;  in main()
220 	/* Non-zero status if there were errors */  in main()
221 	if (fflush(stdout) != 0 || ferror(stdout))  in main()
222 		errx(1, "stdout");  in main()