src/bin/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
  37 #ifndef lint
  38 static const char copyright[] = "@(#) Copyright (c) 1989, 1993, 1994\n  The Regents of the University of California.  All rights reserved.\n";
  39 #endif
  40
  41 #if 1
  42 #ifndef lint
  43 static char sccsid[] = "From: @(#)comm.c        8.4 (Berkeley) 5/4/95";
  44 #endif
  45 #endif
  46
  47 //#include <cdefs.h>
  48 //__FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/comm/comm.c,v 1.20 2002/07/28 15:28:38 dwmalone Exp $");
  49
  50 #include <ctype.h>
  51 //#include <err.h>
  52 #include <limits.h>
  53 #include <locale.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58 #define LINE_MAX 99999
  59 #define MAXLINELEN      (LINE_MAX + 1)
  60
  61 const char *tabs[] = { "", "\t", "\t\t" };
  62
  63 FILE   *file(const char *);
  64 void    show(FILE *, const char *, char *);
  65 int     stricoll(const char *, const char *);
  66 static void     usage(void);
  67 static void printversion(void);
  68
  69 int
  70 main(int argc, char *argv[])
  71 {
  72         int comp, file1done = 0, file2done = 0, read1, read2;
  73         int ch, flag1, flag2, flag3, iflag;
  74         FILE *fp1, *fp2;
  75         const char *col1, *col2, *col3;
  76         char line1[MAXLINELEN], line2[MAXLINELEN];
  77         const char **p;
  78
  79         flag1 = flag2 = flag3 = 1;
  80         iflag = 0;
  81
  82         (void) setlocale(LC_ALL, "");
  83
  84         while ((ch = getopt(argc, argv, "123ivh")) != -1)
  85                 switch(ch) {
  86                 case '1':
  87                         flag1 = 0;
  88                         break;
  89                 case '2':
  90                         flag2 = 0;
  91                         break;
  92                 case '3':
  93                         flag3 = 0;
  94                         break;
  95                 case 'i':
  96                         iflag = 1;
  97                         break;
  98                 case 'v':
  99                         printversion();
 100                         break;
 101                 default:
 102                         usage();
 103                 }
 104
 105         argc -= optind;
 106         argv += optind;
 107
 108         if (argc != 2)
 109                 usage();
 110
 111         fp1 = file(argv[0]);
 112         fp2 = file(argv[1]);
 113
 114         /* for each column printed, add another tab offset */
 115         p = tabs;
 116         col1 = col2 = col3 = NULL;
 117         if (flag1)
 118                 col1 = *p++;
 119         if (flag2)
 120                 col2 = *p++;
 121         if (flag3)
 122                 col3 = *p;
 123
 124         for (read1 = read2 = 1;;) {
 125                 /* read next line, check for EOF */
 126                 if (read1)
 127                         file1done = !fgets(line1, MAXLINELEN, fp1);
 128                 if (read2)
 129                         file2done = !fgets(line2, MAXLINELEN, fp2);
 130
 131                 /* if one file done, display the rest of the other file */
 132                 if (file1done) {
 133                         if (!file2done && col2)
 134                                 show(fp2, col2, line2);
 135                         break;
 136                 }
 137                 if (file2done) {
 138                         if (!file1done && col1)
 139                                 show(fp1, col1, line1);
 140                         break;
 141                 }
 142
 143                 /* lines are the same */
 144                 if(iflag)
 145                         comp = stricoll(line1, line2);
 146                 else
 147                         comp = strcoll(line1, line2);
 148
 149                 if (!comp) {
 150                         read1 = read2 = 1;
 151                         if (col3)
 152                                 (void)printf("%s%s", col3, line1);
 153                         continue;
 154                 }
 155
 156                 /* lines are different */
 157                 if (comp < 0) {
 158                         read1 = 1;
 159                         read2 = 0;
 160                         if (col1)
 161                                 (void)printf("%s%s", col1, line1);
 162                 } else {
 163                         read1 = 0;
 164                         read2 = 1;
 165                         if (col2)
 166                                 (void)printf("%s%s", col2, line2);
 167                 }
 168         }
 169         exit(0);
 170 }
 171
 172 void
 173 show(FILE *fp, const char *offset, char *buf)
 174 {
 175
 176         do {
 177                 (void)printf("%s%s", offset, buf);
 178         } while (fgets(buf, MAXLINELEN, fp));
 179 }
 180
 181 FILE *
 182 file(const char *name)
 183 {
 184         FILE *fp;
 185
 186         if (!strcmp(name, "-"))
 187                 return (stdin);
 188         if ((fp = fopen(name, "r")) == NULL) {
 189                 sprintf("%s", name);
 190         }
 191         return (fp);
 192 }
 193
 194 static void
 195 usage(void)
 196 {
 197         (void)fprintf(stderr, "Usage: /bin/comm [OPTION]... LEFT_FILE RIGHT_FILE
 198 Compare sorted files LEFT_FILE and RIGHT_FILE line by line.
 199
 200   -1              suppress lines unique to left file
 201   -2              suppress lines unique to right file
 202   -3              suppress lines unique to both files
 203   -help           display this help and exit
 204   -version        output version information and exit
 205  ");
 206         exit(1);
 207 }
 208
 209 static void
 210 printversion(void)
 211 {
 212         (void)fprintf(stderr, copyright);
 213         (void)fprintf(stderr, "\nVersion : %s\n", sccsid);
 214         exit(1);
 215 }
 216
 217 int
 218 stricoll(const char *s1, const char *s2)
 219 {
 220         char *p, line1[MAXLINELEN], line2[MAXLINELEN];
 221
 222         for (p = line1; *s1; s1++)
 223                 *p++ = tolower((unsigned char)*s1);
 224         *p = '\0';
 225         for (p = line2; *s2; s2++)
 226                 *p++ = tolower((unsigned char)*s2);
 227         *p = '\0';
 228         return strcoll(line1, line2);
 229 }
 230