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Annotation of src/usr.bin/colrm/colrm.c, Revision 1.6

1.6     ! millert     1: /*     $OpenBSD: colrm.c,v 1.5 2001/11/19 19:02:13 mpech 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.
                     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 char copyright[] =
                     39: "@(#) Copyright (c) 1991, 1993\n\
                     40:        The Regents of the University of California.  All rights reserved.\n";
                     41: #endif /* not lint */
                     42:
                     43: #ifndef lint
                     44: #if 0
                     45: static char sccsid[] = "@(#)colrm.c    8.2 (Berkeley) 5/4/95";
                     46: #endif
1.6     ! millert    47: static char rcsid[] = "$OpenBSD: colrm.c,v 1.5 2001/11/19 19:02:13 mpech Exp $";
1.1       deraadt    48: #endif /* not lint */
                     49:
                     50: #include <sys/types.h>
                     51:
                     52: #include <err.h>
                     53: #include <errno.h>
                     54: #include <limits.h>
                     55: #include <stdio.h>
                     56: #include <stdlib.h>
                     57: #include <string.h>
                     58: #include <unistd.h>
                     59:
                     60: #define        TAB     8
                     61:
1.6     ! millert    62: void check(FILE *);
        !            63: void usage(void);
1.1       deraadt    64:
                     65: int
                     66: main(argc, argv)
                     67:        int argc;
                     68:        char *argv[];
                     69: {
1.5       mpech      70:        u_long column, start, stop;
                     71:        int ch;
1.1       deraadt    72:        char *p;
                     73:
1.3       millert    74:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    75:                switch(ch) {
                     76:                case '?':
                     77:                default:
                     78:                        usage();
                     79:                }
                     80:        argc -= optind;
                     81:        argv += optind;
                     82:
                     83:        start = stop = 0;
                     84:        switch(argc) {
                     85:        case 2:
                     86:                stop = strtol(argv[1], &p, 10);
                     87:                if (stop <= 0 || *p)
                     88:                        errx(1, "illegal column -- %s", argv[1]);
                     89:                /* FALLTHROUGH */
                     90:        case 1:
                     91:                start = strtol(argv[0], &p, 10);
                     92:                if (start <= 0 || *p)
                     93:                        errx(1, "illegal column -- %s", argv[0]);
                     94:                break;
                     95:        case 0:
                     96:                break;
                     97:        default:
                     98:                usage();
                     99:        }
                    100:
                    101:        if (stop && start > stop)
                    102:                err(1, "illegal start and stop columns");
                    103:
                    104:        for (column = 0;;) {
                    105:                switch (ch = getchar()) {
                    106:                case EOF:
                    107:                        check(stdin);
                    108:                        break;
                    109:                case '\b':
                    110:                        if (column)
                    111:                                --column;
                    112:                        break;
                    113:                case '\n':
                    114:                        column = 0;
                    115:                        break;
                    116:                case '\t':
                    117:                        column = (column + TAB) & ~(TAB - 1);
                    118:                        break;
                    119:                default:
                    120:                        ++column;
                    121:                        break;
                    122:                }
                    123:
1.4       deraadt   124:                if ((!start || column < start || (stop && column > stop)) &&
1.1       deraadt   125:                    putchar(ch) == EOF)
                    126:                        check(stdout);
                    127:        }
                    128: }
                    129:
                    130: void
                    131: check(stream)
                    132:        FILE *stream;
                    133: {
                    134:        if (feof(stream))
                    135:                exit(0);
                    136:        if (ferror(stream))
                    137:                err(1, "%s", stream == stdin ? "stdin" : "stdout");
                    138: }
                    139:
                    140: void
                    141: usage()
                    142: {
                    143:        (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
                    144:        exit(1);
                    145: }