Return to colrm.c CVS log

Up to [local] / src / usr.bin / colrm

Annotation of src/usr.bin/colrm/colrm.c, Revision 1.10

1.10    ! deraadt     1: /*     $OpenBSD: colrm.c,v 1.9 2009/10/27 23:59:36 deraadt 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: #include <sys/types.h>
                     34:
                     35: #include <err.h>
                     36: #include <errno.h>
                     37: #include <limits.h>
                     38: #include <stdio.h>
                     39: #include <stdlib.h>
                     40: #include <string.h>
                     41: #include <unistd.h>
                     42:
                     43: #define        TAB     8
                     44:
1.6       millert    45: void check(FILE *);
                     46: void usage(void);
1.1       deraadt    47:
                     48: int
1.8       deraadt    49: main(int argc, char *argv[])
1.1       deraadt    50: {
1.5       mpech      51:        u_long column, start, stop;
                     52:        int ch;
1.1       deraadt    53:        char *p;
1.10    ! deraadt    54:
        !            55:        if (tame("stdio", NULL) == -1)
        !            56:                err(1, "tame");
1.1       deraadt    57:
1.3       millert    58:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    59:                switch(ch) {
                     60:                case '?':
                     61:                default:
                     62:                        usage();
                     63:                }
                     64:        argc -= optind;
                     65:        argv += optind;
                     66:
                     67:        start = stop = 0;
                     68:        switch(argc) {
                     69:        case 2:
                     70:                stop = strtol(argv[1], &p, 10);
                     71:                if (stop <= 0 || *p)
                     72:                        errx(1, "illegal column -- %s", argv[1]);
                     73:                /* FALLTHROUGH */
                     74:        case 1:
                     75:                start = strtol(argv[0], &p, 10);
                     76:                if (start <= 0 || *p)
                     77:                        errx(1, "illegal column -- %s", argv[0]);
                     78:                break;
                     79:        case 0:
                     80:                break;
                     81:        default:
                     82:                usage();
                     83:        }
                     84:
                     85:        if (stop && start > stop)
                     86:                err(1, "illegal start and stop columns");
                     87:
                     88:        for (column = 0;;) {
                     89:                switch (ch = getchar()) {
                     90:                case EOF:
                     91:                        check(stdin);
                     92:                        break;
                     93:                case '\b':
                     94:                        if (column)
                     95:                                --column;
                     96:                        break;
                     97:                case '\n':
                     98:                        column = 0;
                     99:                        break;
                    100:                case '\t':
                    101:                        column = (column + TAB) & ~(TAB - 1);
                    102:                        break;
                    103:                default:
                    104:                        ++column;
                    105:                        break;
                    106:                }
                    107:
1.4       deraadt   108:                if ((!start || column < start || (stop && column > stop)) &&
1.1       deraadt   109:                    putchar(ch) == EOF)
                    110:                        check(stdout);
                    111:        }
                    112: }
                    113:
                    114: void
1.8       deraadt   115: check(FILE *stream)
1.1       deraadt   116: {
                    117:        if (feof(stream))
                    118:                exit(0);
                    119:        if (ferror(stream))
                    120:                err(1, "%s", stream == stdin ? "stdin" : "stdout");
                    121: }
                    122:
                    123: void
1.8       deraadt   124: usage(void)
1.1       deraadt   125: {
                    126:        (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
                    127:        exit(1);
                    128: }