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Annotation of 43BSDReno/usr.bin/comm/comm.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * 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 are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: char copyright[] =
        !            25: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
        !            26:  All rights reserved.\n";
        !            27: #endif /* not lint */
        !            28: 
        !            29: #ifndef lint
        !            30: static char sccsid[] = "@(#)comm.c     5.5 (Berkeley) 6/25/90";
        !            31: #endif /* not lint */
        !            32: 
        !            33: #include <sys/file.h>
        !            34: #include <limits.h>
        !            35: #include <stdio.h>
        !            36: 
        !            37: #define        MAXLINELEN      (_BSD_LINE_MAX + 1)
        !            38: 
        !            39: char *tabs[] = { "", "\t", "\t\t" };
        !            40: 
        !            41: main(argc,argv)
        !            42:        int argc;
        !            43:        char *argv[];
        !            44: {
        !            45:        register int comp, file1done, file2done, read1, read2;
        !            46:        register char *col1, *col2, *col3;
        !            47:        int ch, flag1, flag2, flag3;
        !            48:        FILE *fp1, *fp2, *file();
        !            49:        char **p, line1[MAXLINELEN], line2[MAXLINELEN];
        !            50:        extern int optind;
        !            51: 
        !            52:        flag1 = flag2 = flag3 = 1;
        !            53:        while ((ch = getopt(argc, argv, "-123")) != EOF)
        !            54:                switch(ch) {
        !            55:                case '-':
        !            56:                        --optind;
        !            57:                        goto done;
        !            58:                case '1':
        !            59:                        flag1 = 0;
        !            60:                        break;
        !            61:                case '2':
        !            62:                        flag2 = 0;
        !            63:                        break;
        !            64:                case '3':
        !            65:                        flag3 = 0;
        !            66:                        break;
        !            67:                case '?':
        !            68:                default:
        !            69:                        usage();
        !            70:                }
        !            71: done:  argc -= optind;
        !            72:        argv += optind;
        !            73: 
        !            74:        if (argc != 2)
        !            75:                usage();
        !            76: 
        !            77:        fp1 = file(argv[0]);
        !            78:        fp2 = file(argv[1]);
        !            79: 
        !            80:        /* for each column printed, add another tab offset */
        !            81:        p = tabs;
        !            82:        if (flag1)
        !            83:                col1 = *p++;
        !            84:        if (flag2)
        !            85:                col2 = *p++;
        !            86:        if (flag3)
        !            87:                col3 = *p++;
        !            88: 
        !            89:        for (read1 = read2 = 1;;) {
        !            90:                /* read next line, check for EOF */
        !            91:                if (read1)
        !            92:                        file1done = !fgets(line1, MAXLINELEN, fp1);
        !            93:                if (read2)
        !            94:                        file2done = !fgets(line2, MAXLINELEN, fp2);
        !            95: 
        !            96:                /* if one file done, display the rest of the other file */
        !            97:                if (file1done) {
        !            98:                        if (!file2done && col2)
        !            99:                                show(fp2, col2, line2);
        !           100:                        break;
        !           101:                }
        !           102:                if (file2done) {
        !           103:                        if (!file1done && col1)
        !           104:                                show(fp1, col1, line1);
        !           105:                        break;
        !           106:                }
        !           107: 
        !           108:                /* lines are the same */
        !           109:                if (!(comp = strcmp(line1, line2))) {
        !           110:                        read1 = read2 = 1;
        !           111:                        if (col3)
        !           112:                                (void)printf("%s%s", col3, line1);
        !           113:                        continue;
        !           114:                }
        !           115: 
        !           116:                /* lines are different */
        !           117:                if (comp < 0) {
        !           118:                        read1 = 1;
        !           119:                        read2 = 0;
        !           120:                        if (col1)
        !           121:                                (void)printf("%s%s", col1, line1);
        !           122:                } else {
        !           123:                        read1 = 0;
        !           124:                        read2 = 1;
        !           125:                        if (col2)
        !           126:                                (void)printf("%s%s", col2, line2);
        !           127:                }
        !           128:        }
        !           129:        exit(0);
        !           130: }
        !           131: 
        !           132: show(fp, offset, buf)
        !           133:        FILE *fp;
        !           134:        char *offset, *buf;
        !           135: {
        !           136:        do {
        !           137:                (void)printf("%s%s", offset, buf);
        !           138:        } while (fgets(buf, MAXLINELEN, fp));
        !           139: }
        !           140: 
        !           141: FILE *
        !           142: file(name)
        !           143:        char *name;
        !           144: {
        !           145:        FILE *fp;
        !           146: 
        !           147:        if (!strcmp(name, "-"))
        !           148:                return(stdin);
        !           149:        if (!(fp = fopen(name, "r"))) {
        !           150:                (void)fprintf(stderr, "comm: can't read %s.\n", name);
        !           151:                exit(1);
        !           152:        }
        !           153:        return(fp);
        !           154: }
        !           155: 
        !           156: usage()
        !           157: {
        !           158:        (void)fprintf(stderr, "usage: comm [-123] [ - ] file1 file2\n");
        !           159:        exit(1);
        !           160: }

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