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Annotation of src/usr.bin/colrm/colrm.c, Revision 1.7

1.7     ! millert     1: /*     $OpenBSD: colrm.c,v 1.6 2002/02/16 21:27:45 millert Exp $       */
1.1       deraadt     2: /*     $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $    */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1991, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      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.
1.7     ! millert    16:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #ifndef lint
                     34: static char copyright[] =
                     35: "@(#) Copyright (c) 1991, 1993\n\
                     36:        The Regents of the University of California.  All rights reserved.\n";
                     37: #endif /* not lint */
                     38:
                     39: #ifndef lint
                     40: #if 0
                     41: static char sccsid[] = "@(#)colrm.c    8.2 (Berkeley) 5/4/95";
                     42: #endif
1.7     ! millert    43: static char rcsid[] = "$OpenBSD: colrm.c,v 1.6 2002/02/16 21:27:45 millert Exp $";
1.1       deraadt    44: #endif /* not lint */
                     45:
                     46: #include <sys/types.h>
                     47:
                     48: #include <err.h>
                     49: #include <errno.h>
                     50: #include <limits.h>
                     51: #include <stdio.h>
                     52: #include <stdlib.h>
                     53: #include <string.h>
                     54: #include <unistd.h>
                     55:
                     56: #define        TAB     8
                     57:
1.6       millert    58: void check(FILE *);
                     59: void usage(void);
1.1       deraadt    60:
                     61: int
                     62: main(argc, argv)
                     63:        int argc;
                     64:        char *argv[];
                     65: {
1.5       mpech      66:        u_long column, start, stop;
                     67:        int ch;
1.1       deraadt    68:        char *p;
                     69:
1.3       millert    70:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    71:                switch(ch) {
                     72:                case '?':
                     73:                default:
                     74:                        usage();
                     75:                }
                     76:        argc -= optind;
                     77:        argv += optind;
                     78:
                     79:        start = stop = 0;
                     80:        switch(argc) {
                     81:        case 2:
                     82:                stop = strtol(argv[1], &p, 10);
                     83:                if (stop <= 0 || *p)
                     84:                        errx(1, "illegal column -- %s", argv[1]);
                     85:                /* FALLTHROUGH */
                     86:        case 1:
                     87:                start = strtol(argv[0], &p, 10);
                     88:                if (start <= 0 || *p)
                     89:                        errx(1, "illegal column -- %s", argv[0]);
                     90:                break;
                     91:        case 0:
                     92:                break;
                     93:        default:
                     94:                usage();
                     95:        }
                     96:
                     97:        if (stop && start > stop)
                     98:                err(1, "illegal start and stop columns");
                     99:
                    100:        for (column = 0;;) {
                    101:                switch (ch = getchar()) {
                    102:                case EOF:
                    103:                        check(stdin);
                    104:                        break;
                    105:                case '\b':
                    106:                        if (column)
                    107:                                --column;
                    108:                        break;
                    109:                case '\n':
                    110:                        column = 0;
                    111:                        break;
                    112:                case '\t':
                    113:                        column = (column + TAB) & ~(TAB - 1);
                    114:                        break;
                    115:                default:
                    116:                        ++column;
                    117:                        break;
                    118:                }
                    119:
1.4       deraadt   120:                if ((!start || column < start || (stop && column > stop)) &&
1.1       deraadt   121:                    putchar(ch) == EOF)
                    122:                        check(stdout);
                    123:        }
                    124: }
                    125:
                    126: void
                    127: check(stream)
                    128:        FILE *stream;
                    129: {
                    130:        if (feof(stream))
                    131:                exit(0);
                    132:        if (ferror(stream))
                    133:                err(1, "%s", stream == stdin ? "stdin" : "stdout");
                    134: }
                    135:
                    136: void
                    137: usage()
                    138: {
                    139:        (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
                    140:        exit(1);
                    141: }