usr.bin/comm/comm.c

   1 /*
   2  * Copyright (c) 1989, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Case Larsen.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California.  All rights reserved.
  37  * @(#)comm.c   8.4 (Berkeley) 5/4/95
  38  * $FreeBSD: src/usr.bin/comm/comm.c,v 1.11.2.3 2002/07/11 00:46:37 tjr Exp $
  39  * $DragonFly: src/usr.bin/comm/comm.c,v 1.3 2003/10/02 17:42:27 hmp Exp $
  40  */
  41
  42 #include <ctype.h>
  43 #include <err.h>
  44 #include <limits.h>
  45 #include <locale.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 #define MAXLINELEN      (LINE_MAX + 1)
  52
  53 const char *tabs[] = { "", "\t", "\t\t" };
  54
  55 FILE   *file(char *);
  56 void    show(FILE *, const char *, char *);
  57 int     stricoll(char *, char *);
  58 static void     usage(void);
  59
  60 int
  61 main(int argc, char **argv)
  62 {
  63         int comp, file1done = 0, file2done = 0, read1, read2;
  64         int ch, flag1, flag2, flag3, iflag;
  65         FILE *fp1, *fp2;
  66         const char *col1, *col2, *col3;
  67         char line1[MAXLINELEN], line2[MAXLINELEN];
  68         const char **p;
  69
  70         flag1 = flag2 = flag3 = 1;
  71         iflag = 0;
  72
  73         (void) setlocale(LC_ALL, "");
  74
  75         while ((ch = getopt(argc, argv, "123i")) != -1)
  76                 switch(ch) {
  77                 case '1':
  78                         flag1 = 0;
  79                         break;
  80                 case '2':
  81                         flag2 = 0;
  82                         break;
  83                 case '3':
  84                         flag3 = 0;
  85                         break;
  86                 case 'i':
  87                         iflag = 1;
  88                         break;
  89                 case '?':
  90                 default:
  91                         usage();
  92                 }
  93         argc -= optind;
  94         argv += optind;
  95
  96         if (argc != 2)
  97                 usage();
  98
  99         fp1 = file(argv[0]);
 100         fp2 = file(argv[1]);
 101
 102         /* for each column printed, add another tab offset */
 103         p = tabs;
 104         col1 = col2 = col3 = NULL;
 105         if (flag1)
 106                 col1 = *p++;
 107         if (flag2)
 108                 col2 = *p++;
 109         if (flag3)
 110                 col3 = *p;
 111
 112         for (read1 = read2 = 1;;) {
 113                 /* read next line, check for EOF */
 114                 if (read1)
 115                         file1done = !fgets(line1, MAXLINELEN, fp1);
 116                 if (read2)
 117                         file2done = !fgets(line2, MAXLINELEN, fp2);
 118
 119                 /* if one file done, display the rest of the other file */
 120                 if (file1done) {
 121                         if (!file2done && col2)
 122                                 show(fp2, col2, line2);
 123                         break;
 124                 }
 125                 if (file2done) {
 126                         if (!file1done && col1)
 127                                 show(fp1, col1, line1);
 128                         break;
 129                 }
 130
 131                 /* lines are the same */
 132                 if(iflag)
 133                         comp = stricoll(line1, line2);
 134                 else
 135                         comp = strcoll(line1, line2);
 136
 137                 if (!comp) {
 138                         read1 = read2 = 1;
 139                         if (col3)
 140                                 (void)printf("%s%s", col3, line1);
 141                         continue;
 142                 }
 143
 144                 /* lines are different */
 145                 if (comp < 0) {
 146                         read1 = 1;
 147                         read2 = 0;
 148                         if (col1)
 149                                 (void)printf("%s%s", col1, line1);
 150                 } else {
 151                         read1 = 0;
 152                         read2 = 1;
 153                         if (col2)
 154                                 (void)printf("%s%s", col2, line2);
 155                 }
 156         }
 157         exit(0);
 158 }
 159
 160 void
 161 show(FILE *fp, const char *offset, char *buf)
 162 {
 163
 164         do {
 165                 (void)printf("%s%s", offset, buf);
 166         } while (fgets(buf, MAXLINELEN, fp));
 167 }
 168
 169 FILE *
 170 file(char *name)
 171 {
 172         FILE *fp;
 173
 174         if (!strcmp(name, "-"))
 175                 return (stdin);
 176         if ((fp = fopen(name, "r")) == NULL) {
 177                 err(1, "%s", name);
 178         }
 179         return (fp);
 180 }
 181
 182 static void
 183 usage(void)
 184 {
 185         (void)fprintf(stderr, "usage: comm [-123i] file1 file2\n");
 186         exit(1);
 187 }
 188
 189 int
 190 stricoll(char *s1, char *s2)
 191 {
 192         char *p, line1[MAXLINELEN], line2[MAXLINELEN];
 193
 194         for (p = line1; *s1; s1++)
 195                 *p++ = tolower((unsigned char)*s1);
 196         *p = '\0';
 197         for (p = line2; *s2; s2++)
 198                 *p++ = tolower((unsigned char)*s2);
 199         *p = '\0';
 200         return strcoll(line1, line2);
 201 }