Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 2 | /* |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 3 | * echo implementation for busybox |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 4 | * |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 5 | * Copyright (c) 1991, 1993 |
| 6 | * The Regents of the University of California. All rights reserved. |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 7 | * |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 9 | * |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 10 | * Original copyright notice is retained at the end of this file. |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 11 | */ |
| 12 | |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 13 | /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */ |
| 14 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */ |
| 15 | |
| 16 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
| 17 | * |
| 18 | * Because of behavioral differences, implemented configurable SUSv3 |
| 19 | * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs. |
| 20 | * 1) In handling '\c' escape, the previous version only suppressed the |
| 21 | * trailing newline. SUSv3 specifies _no_ output after '\c'. |
| 22 | * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}. |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 23 | * The previous version did not allow 4-digit octals. |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 24 | */ |
| 25 | |
Eric Andersen | cbe31da | 2001-02-20 06:14:08 +0000 | [diff] [blame] | 26 | #include "busybox.h" |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 27 | |
Denis Vlasenko | bf66fbc | 2006-12-21 13:23:14 +0000 | [diff] [blame] | 28 | int bb_echo(char **argv) |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 29 | { |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 30 | const char *arg; |
| 31 | #if !ENABLE_FEATURE_FANCY_ECHO |
Denis Vlasenko | a9d7d24 | 2007-04-10 16:34:00 +0000 | [diff] [blame] | 32 | enum { |
| 33 | eflag = '\\', |
| 34 | nflag = 1, /* 1 -- print '\n' */ |
| 35 | }; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 36 | ++argv; |
| 37 | #else |
| 38 | const char *p; |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 39 | char nflag = 1; |
| 40 | char eflag = 0; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 41 | |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 42 | while (1) { |
| 43 | arg = *++argv; |
| 44 | if (!arg) |
Denis Vlasenko | a9d7d24 | 2007-04-10 16:34:00 +0000 | [diff] [blame] | 45 | goto newline_ret; |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 46 | if (*arg != '-') |
| 47 | break; |
| 48 | |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 49 | /* If it appears that we are handling options, then make sure |
| 50 | * that all of the options specified are actually valid. |
| 51 | * Otherwise, the string should just be echoed. |
| 52 | */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 53 | p = arg + 1; |
| 54 | if (!*p) /* A single '-', so echo it. */ |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 55 | goto just_echo; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 56 | |
| 57 | do { |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 58 | if (!strrchr("neE", *p)) |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 59 | goto just_echo; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 60 | } while (*++p); |
| 61 | |
| 62 | /* All of the options in this arg are valid, so handle them. */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 63 | p = arg + 1; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 64 | do { |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 65 | if (*p == 'n') |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 66 | nflag = 0; |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 67 | if (*p == 'e') |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 68 | eflag = '\\'; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 69 | } while (*++p); |
| 70 | } |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 71 | just_echo: |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 72 | #endif |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 73 | while (1) { |
Denis Vlasenko | a9d7d24 | 2007-04-10 16:34:00 +0000 | [diff] [blame] | 74 | /* arg is already == *argv and isn't NULL */ |
"Robert P. J. Day" | 6822983 | 2006-07-01 13:08:46 +0000 | [diff] [blame] | 75 | int c; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 76 | |
Denis Vlasenko | a9d7d24 | 2007-04-10 16:34:00 +0000 | [diff] [blame] | 77 | if (!eflag) { |
| 78 | /* optimization for very common case */ |
| 79 | fputs(arg, stdout); |
| 80 | } else while ((c = *arg++)) { |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 81 | if (c == eflag) { /* Check for escape seq. */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 82 | if (*arg == 'c') { |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 83 | /* '\c' means cancel newline and |
| 84 | * ignore all subsequent chars. */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 85 | goto ret; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 86 | } |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 87 | #if !ENABLE_FEATURE_FANCY_ECHO |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 88 | /* SUSv3 specifies that octal escapes must begin with '0'. */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 89 | if ( (((unsigned char)*arg) - '1') >= 7) |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 90 | #endif |
| 91 | { |
| 92 | /* Since SUSv3 mandates a first digit of 0, 4-digit octals |
| 93 | * of the form \0### are accepted. */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 94 | if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) { |
| 95 | arg++; |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 96 | } |
| 97 | /* bb_process_escape_sequence can handle nul correctly */ |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 98 | c = bb_process_escape_sequence(&arg); |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 99 | } |
| 100 | } |
| 101 | putchar(c); |
| 102 | } |
| 103 | |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 104 | arg = *++argv; |
| 105 | if (!arg) |
| 106 | break; |
| 107 | putchar(' '); |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 108 | } |
| 109 | |
Denis Vlasenko | 335b63d | 2007-04-10 21:38:30 +0000 | [diff] [blame] | 110 | #if ENABLE_FEATURE_FANCY_ECHO |
Denis Vlasenko | a9d7d24 | 2007-04-10 16:34:00 +0000 | [diff] [blame] | 111 | newline_ret: |
Denis Vlasenko | 335b63d | 2007-04-10 21:38:30 +0000 | [diff] [blame] | 112 | #endif |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 113 | if (nflag) { |
| 114 | putchar('\n'); |
| 115 | } |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 116 | ret: |
| 117 | return fflush(stdout); |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 118 | } |
| 119 | |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 120 | /* This is a NOFORK applet. Be very careful! */ |
| 121 | |
Denis Vlasenko | 06af216 | 2007-02-03 17:28:39 +0000 | [diff] [blame] | 122 | int echo_main(int argc, char** argv); |
Rob Landley | dfba741 | 2006-03-06 20:47:33 +0000 | [diff] [blame] | 123 | int echo_main(int argc, char** argv) |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 124 | { |
Denis Vlasenko | 7e754f1 | 2007-04-09 13:04:50 +0000 | [diff] [blame] | 125 | return bb_echo(argv); |
Erik Andersen | 13456d1 | 2000-03-16 08:09:57 +0000 | [diff] [blame] | 126 | } |
Paul Fox | 6ab0378 | 2006-06-08 21:37:26 +0000 | [diff] [blame] | 127 | |
| 128 | /*- |
| 129 | * Copyright (c) 1991, 1993 |
| 130 | * The Regents of the University of California. All rights reserved. |
| 131 | * |
| 132 | * This code is derived from software contributed to Berkeley by |
| 133 | * Kenneth Almquist. |
| 134 | * |
| 135 | * Redistribution and use in source and binary forms, with or without |
| 136 | * modification, are permitted provided that the following conditions |
| 137 | * are met: |
| 138 | * 1. Redistributions of source code must retain the above copyright |
| 139 | * notice, this list of conditions and the following disclaimer. |
| 140 | * 2. Redistributions in binary form must reproduce the above copyright |
| 141 | * notice, this list of conditions and the following disclaimer in the |
| 142 | * documentation and/or other materials provided with the distribution. |
| 143 | * |
| 144 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change |
| 145 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> |
| 146 | * |
| 147 | * California, Berkeley and its contributors. |
| 148 | * 4. Neither the name of the University nor the names of its contributors |
| 149 | * may be used to endorse or promote products derived from this software |
| 150 | * without specific prior written permission. |
| 151 | * |
| 152 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 153 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 154 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 155 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 156 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 157 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 158 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 159 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 160 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 161 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 162 | * SUCH DAMAGE. |
| 163 | * |
| 164 | * @(#)echo.c 8.1 (Berkeley) 5/31/93 |
| 165 | */ |