diff options
Diffstat (limited to 'coreutils/echo.c')
-rw-r--r-- | coreutils/echo.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/coreutils/echo.c b/coreutils/echo.c new file mode 100644 index 000000000..99063ae52 --- /dev/null +++ b/coreutils/echo.c | |||
@@ -0,0 +1,158 @@ | |||
1 | /* vi: set sw=4 ts=4: */ | ||
2 | /* | ||
3 | * echo implementation for busybox | ||
4 | * | ||
5 | * Copyright (c) 1991, 1993 | ||
6 | * The Regents of the University of California. All rights reserved. | ||
7 | * | ||
8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
9 | * | ||
10 | * Original copyright notice is retained at the end of this file. | ||
11 | */ | ||
12 | |||
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{#{#{#}}}. | ||
23 | * The previous version version did not allow 4-digit octals. | ||
24 | */ | ||
25 | |||
26 | |||
27 | #include <stdio.h> | ||
28 | #include <string.h> | ||
29 | #include <stdlib.h> | ||
30 | #include "busybox.h" | ||
31 | |||
32 | int bb_echo(int ATTRIBUTE_UNUSED argc, char **argv) | ||
33 | { | ||
34 | #ifndef CONFIG_FEATURE_FANCY_ECHO | ||
35 | #define eflag '\\' | ||
36 | ++argv; | ||
37 | #else | ||
38 | const char *p; | ||
39 | int nflag = 1; | ||
40 | int eflag = 0; | ||
41 | |||
42 | while (*++argv && (**argv == '-')) { | ||
43 | /* If it appears that we are handling options, then make sure | ||
44 | * that all of the options specified are actually valid. | ||
45 | * Otherwise, the string should just be echoed. | ||
46 | */ | ||
47 | |||
48 | if (!*(p = *argv + 1)) { /* A single '-', so echo it. */ | ||
49 | goto just_echo; | ||
50 | } | ||
51 | |||
52 | do { | ||
53 | if (strrchr("neE", *p) == 0) { | ||
54 | goto just_echo; | ||
55 | } | ||
56 | } while (*++p); | ||
57 | |||
58 | /* All of the options in this arg are valid, so handle them. */ | ||
59 | p = *argv + 1; | ||
60 | do { | ||
61 | if (*p == 'n') { | ||
62 | nflag = 0; | ||
63 | } else if (*p == 'e') { | ||
64 | eflag = '\\'; | ||
65 | } else { | ||
66 | eflag = 0; | ||
67 | } | ||
68 | } while (*++p); | ||
69 | } | ||
70 | |||
71 | just_echo: | ||
72 | #endif | ||
73 | while (*argv) { | ||
74 | int c; | ||
75 | |||
76 | while ((c = *(*argv)++)) { | ||
77 | if (c == eflag) { /* Check for escape seq. */ | ||
78 | if (**argv == 'c') { | ||
79 | /* '\c' means cancel newline and | ||
80 | * ignore all subsequent chars. */ | ||
81 | return 0; | ||
82 | } | ||
83 | #ifndef CONFIG_FEATURE_FANCY_ECHO | ||
84 | /* SUSv3 specifies that octal escapes must begin with '0'. */ | ||
85 | if (((unsigned int)(**argv - '1')) >= 7) | ||
86 | #endif | ||
87 | { | ||
88 | /* Since SUSv3 mandates a first digit of 0, 4-digit octals | ||
89 | * of the form \0### are accepted. */ | ||
90 | if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) { | ||
91 | (*argv)++; | ||
92 | } | ||
93 | /* bb_process_escape_sequence can handle nul correctly */ | ||
94 | c = bb_process_escape_sequence((const char **) argv); | ||
95 | } | ||
96 | } | ||
97 | putchar(c); | ||
98 | } | ||
99 | |||
100 | if (*++argv) { | ||
101 | putchar(' '); | ||
102 | } | ||
103 | } | ||
104 | |||
105 | #ifdef CONFIG_FEATURE_FANCY_ECHO | ||
106 | if (nflag) { | ||
107 | putchar('\n'); | ||
108 | } | ||
109 | #else | ||
110 | putchar('\n'); | ||
111 | #endif | ||
112 | return 0; | ||
113 | } | ||
114 | |||
115 | int echo_main(int argc, char** argv) | ||
116 | { | ||
117 | (void)bb_echo(argc, argv); | ||
118 | fflush_stdout_and_exit(EXIT_SUCCESS); | ||
119 | } | ||
120 | |||
121 | /*- | ||
122 | * Copyright (c) 1991, 1993 | ||
123 | * The Regents of the University of California. All rights reserved. | ||
124 | * | ||
125 | * This code is derived from software contributed to Berkeley by | ||
126 | * Kenneth Almquist. | ||
127 | * | ||
128 | * Redistribution and use in source and binary forms, with or without | ||
129 | * modification, are permitted provided that the following conditions | ||
130 | * are met: | ||
131 | * 1. Redistributions of source code must retain the above copyright | ||
132 | * notice, this list of conditions and the following disclaimer. | ||
133 | * 2. Redistributions in binary form must reproduce the above copyright | ||
134 | * notice, this list of conditions and the following disclaimer in the | ||
135 | * documentation and/or other materials provided with the distribution. | ||
136 | * | ||
137 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change | ||
138 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> | ||
139 | * | ||
140 | * California, Berkeley and its contributors. | ||
141 | * 4. Neither the name of the University nor the names of its contributors | ||
142 | * may be used to endorse or promote products derived from this software | ||
143 | * without specific prior written permission. | ||
144 | * | ||
145 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
146 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
147 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
148 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
149 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
150 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
151 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
152 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
153 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
154 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
155 | * SUCH DAMAGE. | ||
156 | * | ||
157 | * @(#)echo.c 8.1 (Berkeley) 5/31/93 | ||
158 | */ | ||