| 1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef lint |
| 35 | static char sccsid[] = "@(#)util.c 5.2 (Berkeley) 6/4/91"; |
| 36 | #endif /* not lint */ |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <sys/stat.h> |
| 40 | #include <unistd.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include "stty.h" |
| 44 | #include "extern.h" |
| 45 | |
| 46 | /* |
| 47 | * Gross, but since we're changing the control descriptor from 1 to 0, most |
| 48 | * users will be probably be doing "stty > /dev/sometty" by accident. If 1 |
| 49 | * and 2 are both ttys, but not the same, assume that 1 was incorrectly |
| 50 | * redirected. |
| 51 | */ |
| 52 | void |
| 53 | checkredirect() |
| 54 | { |
| 55 | struct stat sb1, sb2; |
| 56 | |
| 57 | if (isatty(STDOUT_FILENO) && isatty(STDERR_FILENO) && |
| 58 | !fstat(STDOUT_FILENO, &sb1) && !fstat(STDERR_FILENO, &sb2) && |
| 59 | (sb1.st_rdev != sb2.st_rdev)) |
| 60 | warn("stdout appears redirected, but stdin is the control descriptor"); |
| 61 | } |
| 62 | |
| 63 | #if __STDC__ |
| 64 | #include <stdarg.h> |
| 65 | #else |
| 66 | #include <varargs.h> |
| 67 | #endif |
| 68 | |
| 69 | void |
| 70 | #if __STDC__ |
| 71 | err(const char *fmt, ...) |
| 72 | #else |
| 73 | err(fmt, va_alist) |
| 74 | char *fmt; |
| 75 | va_dcl |
| 76 | #endif |
| 77 | { |
| 78 | va_list ap; |
| 79 | #if __STDC__ |
| 80 | va_start(ap, fmt); |
| 81 | #else |
| 82 | va_start(ap); |
| 83 | #endif |
| 84 | (void)fprintf(stderr, "stty: "); |
| 85 | (void)vfprintf(stderr, fmt, ap); |
| 86 | va_end(ap); |
| 87 | (void)fprintf(stderr, "\n"); |
| 88 | exit(1); |
| 89 | /* NOTREACHED */ |
| 90 | } |
| 91 | |
| 92 | void |
| 93 | #if __STDC__ |
| 94 | warn(const char *fmt, ...) |
| 95 | #else |
| 96 | warn(fmt, va_alist) |
| 97 | char *fmt; |
| 98 | va_dcl |
| 99 | #endif |
| 100 | { |
| 101 | va_list ap; |
| 102 | #if __STDC__ |
| 103 | va_start(ap, fmt); |
| 104 | #else |
| 105 | va_start(ap); |
| 106 | #endif |
| 107 | (void)fprintf(stderr, "stty: "); |
| 108 | (void)vfprintf(stderr, fmt, ap); |
| 109 | va_end(ap); |
| 110 | (void)fprintf(stderr, "\n"); |
| 111 | } |