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tr.c revision 1.3 
      1 /*
      2  * Copyright (c) 1988 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)tr.c	5.4 (Berkeley) 3/3/93";*/
     42 static char rcsid[] = "$Id: tr.c,v 1.3 1993/08/01 18:04:34 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <string.h>
     49 #include "extern.h"
     50 
     51 static int string1[NCHARS] = {
     52 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,		/* ASCII */
     53 	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
     54 	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
     55 	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
     56 	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
     57 	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
     58 	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
     59 	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
     60 	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
     61 	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
     62 	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
     63 	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
     64 	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
     65 	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
     66 	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
     67 	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
     68 	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
     69 	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
     70 	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
     71 	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
     72 	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
     73 	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
     74 	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
     75 	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
     76 	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
     77 	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
     78 	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
     79 	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
     80 	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
     81 	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
     82 	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
     83 	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
     84 }, string2[NCHARS];
     85 
     86 STR s1 = { STRING1, NORMAL, 0, OOBCH, { 0, OOBCH }, NULL, NULL };
     87 STR s2 = { STRING2, NORMAL, 0, OOBCH, { 0, OOBCH }, NULL, NULL };
     88 
     89 static void setup __P((int *, char *, STR *, int));
     90 static void usage __P((void));
     91 
     92 int
     93 main(argc, argv)
     94 	int argc;
     95 	char **argv;
     96 {
     97 	register int ch, cnt, lastch, *p;
     98 	int cflag, dflag, sflag, isstring2;
     99 
    100 	cflag = dflag = sflag = 0;
    101 	while ((ch = getopt(argc, argv, "cds")) != EOF)
    102 		switch((char)ch) {
    103 		case 'c':
    104 			cflag = 1;
    105 			break;
    106 		case 'd':
    107 			dflag = 1;
    108 			break;
    109 		case 's':
    110 			sflag = 1;
    111 			break;
    112 		case '?':
    113 		default:
    114 			usage();
    115 		}
    116 	argc -= optind;
    117 	argv += optind;
    118 
    119 	switch(argc) {
    120 	case 0:
    121 	default:
    122 		usage();
    123 		/* NOTREACHED */
    124 	case 1:
    125 		isstring2 = 0;
    126 		break;
    127 	case 2:
    128 		isstring2 = 1;
    129 		break;
    130 	}
    131 
    132 	/*
    133 	 * tr -ds [-c] string1 string2
    134 	 * Delete all characters (or complemented characters) in string1.
    135 	 * Squeeze all characters in string2.
    136 	 */
    137 	if (dflag && sflag) {
    138 		if (!isstring2)
    139 			usage();
    140 
    141 		setup(string1, argv[0], &s1, cflag);
    142 		setup(string2, argv[1], &s2, 0);
    143 
    144 		for (lastch = OOBCH; (ch = getchar()) != EOF;)
    145 			if (!string1[ch] && (!string2[ch] || lastch != ch)) {
    146 				lastch = ch;
    147 				(void)putchar(ch);
    148 			}
    149 		exit(0);
    150 	}
    151 
    152 	/*
    153 	 * tr -d [-c] string1
    154 	 * Delete all characters (or complemented characters) in string1.
    155 	 */
    156 	if (dflag) {
    157 		if (isstring2)
    158 			usage();
    159 
    160 		setup(string1, argv[0], &s1, cflag);
    161 
    162 		while ((ch = getchar()) != EOF)
    163 			if (!string1[ch])
    164 				(void)putchar(ch);
    165 		exit(0);
    166 	}
    167 
    168 	/*
    169 	 * tr -s [-c] string1
    170 	 * Squeeze all characters (or complemented characters) in string1.
    171 	 */
    172 	if (sflag && !isstring2) {
    173 		setup(string1, argv[0], &s1, cflag);
    174 
    175 		for (lastch = OOBCH; (ch = getchar()) != EOF;)
    176 			if (!string1[ch] || lastch != ch) {
    177 				lastch = ch;
    178 				(void)putchar(ch);
    179 			}
    180 		exit(0);
    181 	}
    182 
    183 	/*
    184 	 * tr [-cs] string1 string2
    185 	 * Replace all characters (or complemented characters) in string1 with
    186 	 * the character in the same position in string2.  If the -s option is
    187 	 * specified, squeeze all the characters in string2.
    188 	 */
    189 	if (!isstring2)
    190 		usage();
    191 
    192 	s1.str = argv[0];
    193 	s2.str = argv[1];
    194 
    195 	if (cflag)
    196 		for (cnt = NCHARS, p = string1; cnt--;)
    197 			*p++ = OOBCH;
    198 
    199 	if (!next(&s2))
    200 		err("empty string2");
    201 
    202 	/* If string2 runs out of characters, use the last one specified. */
    203 	if (sflag)
    204 		while (next(&s1)) {
    205 			string1[s1.lastch] = ch = s2.lastch;
    206 			string2[ch] = 1;
    207 			(void)next(&s2);
    208 		}
    209 	else
    210 		while (next(&s1)) {
    211 			string1[s1.lastch] = ch = s2.lastch;
    212 			(void)next(&s2);
    213 		}
    214 
    215 	if (cflag)
    216 		for (cnt = 0, p = string1; cnt < NCHARS; ++p, ++cnt)
    217 			*p = *p == OOBCH ? ch : cnt;
    218 
    219 	if (sflag)
    220 		for (lastch = OOBCH; (ch = getchar()) != EOF;) {
    221 			ch = string1[ch];
    222 			if (!string2[ch] || lastch != ch) {
    223 				lastch = ch;
    224 				(void)putchar(ch);
    225 			}
    226 		}
    227 	else
    228 		while ((ch = getchar()) != EOF)
    229 			(void)putchar(string1[ch]);
    230 	exit (0);
    231 }
    232 
    233 static void
    234 setup(string, arg, str, cflag)
    235 	int *string;
    236 	char *arg;
    237 	STR *str;
    238 	int cflag;
    239 {
    240 	register int cnt, *p;
    241 
    242 	str->str = arg;
    243 	bzero(string, NCHARS * sizeof(int));
    244 	while (next(str))
    245 		string[str->lastch] = 1;
    246 	if (cflag)
    247 		for (p = string, cnt = NCHARS; cnt--; ++p)
    248 			*p = !*p;
    249 }
    250 
    251 static void
    252 usage()
    253 {
    254 	(void)fprintf(stderr, "usage: tr [-cs] string1 string2\n");
    255 	(void)fprintf(stderr, "       tr [-c] -d string1\n");
    256 	(void)fprintf(stderr, "       tr [-c] -s string1\n");
    257 	(void)fprintf(stderr, "       tr [-c] -ds string1 string2\n");
    258 	exit(1);
    259 }
    260 
    261 #if __STDC__
    262 #include <stdarg.h>
    263 #else
    264 #include <varargs.h>
    265 #endif
    266 
    267 void
    268 #if __STDC__
    269 err(const char *fmt, ...)
    270 #else
    271 err(fmt, va_alist)
    272 	char *fmt;
    273         va_dcl
    274 #endif
    275 {
    276 	va_list ap;
    277 #if __STDC__
    278 	va_start(ap, fmt);
    279 #else
    280 	va_start(ap);
    281 #endif
    282 	(void)fprintf(stderr, "tr: ");
    283 	(void)vfprintf(stderr, fmt, ap);
    284 	va_end(ap);
    285 	(void)fprintf(stderr, "\n");
    286 	exit(1);
    287 	/* NOTREACHED */
    288 }
    289