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Annotation of src/usr.bin/colrm/colrm.c, Revision 1.1.1.1

1.1       deraadt     1: /*     $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $    */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1991, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: static char copyright[] =
                     38: "@(#) Copyright (c) 1991, 1993\n\
                     39:        The Regents of the University of California.  All rights reserved.\n";
                     40: #endif /* not lint */
                     41:
                     42: #ifndef lint
                     43: #if 0
                     44: static char sccsid[] = "@(#)colrm.c    8.2 (Berkeley) 5/4/95";
                     45: #endif
                     46: static char rcsid[] = "$NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $";
                     47: #endif /* not lint */
                     48:
                     49: #include <sys/types.h>
                     50:
                     51: #include <err.h>
                     52: #include <errno.h>
                     53: #include <limits.h>
                     54: #include <stdio.h>
                     55: #include <stdlib.h>
                     56: #include <string.h>
                     57: #include <unistd.h>
                     58:
                     59: #define        TAB     8
                     60:
                     61: void check __P((FILE *));
                     62: void usage __P((void));
                     63:
                     64: int
                     65: main(argc, argv)
                     66:        int argc;
                     67:        char *argv[];
                     68: {
                     69:        register u_long column, start, stop;
                     70:        register int ch;
                     71:        char *p;
                     72:
                     73:        while ((ch = getopt(argc, argv, "")) != EOF)
                     74:                switch(ch) {
                     75:                case '?':
                     76:                default:
                     77:                        usage();
                     78:                }
                     79:        argc -= optind;
                     80:        argv += optind;
                     81:
                     82:        start = stop = 0;
                     83:        switch(argc) {
                     84:        case 2:
                     85:                stop = strtol(argv[1], &p, 10);
                     86:                if (stop <= 0 || *p)
                     87:                        errx(1, "illegal column -- %s", argv[1]);
                     88:                /* FALLTHROUGH */
                     89:        case 1:
                     90:                start = strtol(argv[0], &p, 10);
                     91:                if (start <= 0 || *p)
                     92:                        errx(1, "illegal column -- %s", argv[0]);
                     93:                break;
                     94:        case 0:
                     95:                break;
                     96:        default:
                     97:                usage();
                     98:        }
                     99:
                    100:        if (stop && start > stop)
                    101:                err(1, "illegal start and stop columns");
                    102:
                    103:        for (column = 0;;) {
                    104:                switch (ch = getchar()) {
                    105:                case EOF:
                    106:                        check(stdin);
                    107:                        break;
                    108:                case '\b':
                    109:                        if (column)
                    110:                                --column;
                    111:                        break;
                    112:                case '\n':
                    113:                        column = 0;
                    114:                        break;
                    115:                case '\t':
                    116:                        column = (column + TAB) & ~(TAB - 1);
                    117:                        break;
                    118:                default:
                    119:                        ++column;
                    120:                        break;
                    121:                }
                    122:
                    123:                if ((!start || column < start || stop && column > stop) &&
                    124:                    putchar(ch) == EOF)
                    125:                        check(stdout);
                    126:        }
                    127: }
                    128:
                    129: void
                    130: check(stream)
                    131:        FILE *stream;
                    132: {
                    133:        if (feof(stream))
                    134:                exit(0);
                    135:        if (ferror(stream))
                    136:                err(1, "%s", stream == stdin ? "stdin" : "stdout");
                    137: }
                    138:
                    139: void
                    140: usage()
                    141: {
                    142:        (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
                    143:        exit(1);
                    144: }