Annotation of /tags/mkinitrd-6_2_0/scripts/echo.c
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Sun May 30 11:53:18 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:53:18 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 5958 byte(s)
tagged 'mkinitrd-6_2_0'
1 | niro | 816 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * echo implementation for busybox - used as a helper for testsuite/* | ||
4 | * on systems lacking "echo -en" | ||
5 | * | ||
6 | * Copyright (c) 1991, 1993 | ||
7 | * The Regents of the University of California. All rights reserved. | ||
8 | * | ||
9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
10 | * | ||
11 | * Original copyright notice is retained at the end of this file. | ||
12 | */ | ||
13 | |||
14 | /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */ | ||
15 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */ | ||
16 | |||
17 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) | ||
18 | * | ||
19 | * Because of behavioral differences, implemented configurable SUSv3 | ||
20 | * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs. | ||
21 | * 1) In handling '\c' escape, the previous version only suppressed the | ||
22 | * trailing newline. SUSv3 specifies _no_ output after '\c'. | ||
23 | * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}. | ||
24 | * The previous version did not allow 4-digit octals. | ||
25 | */ | ||
26 | |||
27 | #include <stdio.h> | ||
28 | #include <string.h> | ||
29 | #include <limits.h> | ||
30 | |||
31 | #define WANT_HEX_ESCAPES 1 | ||
32 | |||
33 | /* Usual "this only works for ascii compatible encodings" disclaimer. */ | ||
34 | #undef _tolower | ||
35 | #define _tolower(X) ((X)|((char) 0x20)) | ||
36 | |||
37 | static char bb_process_escape_sequence(const char **ptr) | ||
38 | { | ||
39 | static const char charmap[] = { | ||
40 | 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0, | ||
41 | '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' }; | ||
42 | |||
43 | const char *p; | ||
44 | const char *q; | ||
45 | unsigned int num_digits; | ||
46 | unsigned int r; | ||
47 | unsigned int n; | ||
48 | unsigned int d; | ||
49 | unsigned int base; | ||
50 | |||
51 | num_digits = n = 0; | ||
52 | base = 8; | ||
53 | q = *ptr; | ||
54 | |||
55 | #ifdef WANT_HEX_ESCAPES | ||
56 | if (*q == 'x') { | ||
57 | ++q; | ||
58 | base = 16; | ||
59 | ++num_digits; | ||
60 | } | ||
61 | #endif | ||
62 | |||
63 | do { | ||
64 | d = (unsigned char)(*q) - '0'; | ||
65 | #ifdef WANT_HEX_ESCAPES | ||
66 | if (d >= 10) { | ||
67 | d = (unsigned char)(_tolower(*q)) - 'a' + 10; | ||
68 | } | ||
69 | #endif | ||
70 | |||
71 | if (d >= base) { | ||
72 | #ifdef WANT_HEX_ESCAPES | ||
73 | if ((base == 16) && (!--num_digits)) { | ||
74 | /* return '\\'; */ | ||
75 | --q; | ||
76 | } | ||
77 | #endif | ||
78 | break; | ||
79 | } | ||
80 | |||
81 | r = n * base + d; | ||
82 | if (r > UCHAR_MAX) { | ||
83 | break; | ||
84 | } | ||
85 | |||
86 | n = r; | ||
87 | ++q; | ||
88 | } while (++num_digits < 3); | ||
89 | |||
90 | if (num_digits == 0) { /* mnemonic escape sequence? */ | ||
91 | p = charmap; | ||
92 | do { | ||
93 | if (*p == *q) { | ||
94 | q++; | ||
95 | break; | ||
96 | } | ||
97 | } while (*++p); | ||
98 | n = *(p + (sizeof(charmap)/2)); | ||
99 | } | ||
100 | |||
101 | *ptr = q; | ||
102 | |||
103 | return (char) n; | ||
104 | } | ||
105 | |||
106 | |||
107 | int main(int argc, char **argv) | ||
108 | { | ||
109 | const char *arg; | ||
110 | const char *p; | ||
111 | char nflag = 1; | ||
112 | char eflag = 0; | ||
113 | |||
114 | /* We must check that stdout is not closed. */ | ||
115 | if (dup2(1, 1) != 1) | ||
116 | return -1; | ||
117 | |||
118 | while (1) { | ||
119 | arg = *++argv; | ||
120 | if (!arg) | ||
121 | goto newline_ret; | ||
122 | if (*arg != '-') | ||
123 | break; | ||
124 | |||
125 | /* If it appears that we are handling options, then make sure | ||
126 | * that all of the options specified are actually valid. | ||
127 | * Otherwise, the string should just be echoed. | ||
128 | */ | ||
129 | p = arg + 1; | ||
130 | if (!*p) /* A single '-', so echo it. */ | ||
131 | goto just_echo; | ||
132 | |||
133 | do { | ||
134 | if (!strrchr("neE", *p)) | ||
135 | goto just_echo; | ||
136 | } while (*++p); | ||
137 | |||
138 | /* All of the options in this arg are valid, so handle them. */ | ||
139 | p = arg + 1; | ||
140 | do { | ||
141 | if (*p == 'n') | ||
142 | nflag = 0; | ||
143 | if (*p == 'e') | ||
144 | eflag = '\\'; | ||
145 | } while (*++p); | ||
146 | } | ||
147 | just_echo: | ||
148 | while (1) { | ||
149 | /* arg is already == *argv and isn't NULL */ | ||
150 | int c; | ||
151 | |||
152 | if (!eflag) { | ||
153 | /* optimization for very common case */ | ||
154 | fputs(arg, stdout); | ||
155 | } else while ((c = *arg++)) { | ||
156 | if (c == eflag) { /* Check for escape seq. */ | ||
157 | if (*arg == 'c') { | ||
158 | /* '\c' means cancel newline and | ||
159 | * ignore all subsequent chars. */ | ||
160 | goto ret; | ||
161 | } | ||
162 | { | ||
163 | /* Since SUSv3 mandates a first digit of 0, 4-digit octals | ||
164 | * of the form \0### are accepted. */ | ||
165 | if (*arg == '0') { | ||
166 | /* NB: don't turn "...\0" into "...\" */ | ||
167 | if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) { | ||
168 | arg++; | ||
169 | } | ||
170 | } | ||
171 | /* bb_process_escape_sequence handles NUL correctly | ||
172 | * ("...\" case. */ | ||
173 | c = bb_process_escape_sequence(&arg); | ||
174 | } | ||
175 | } | ||
176 | putchar(c); | ||
177 | } | ||
178 | |||
179 | arg = *++argv; | ||
180 | if (!arg) | ||
181 | break; | ||
182 | putchar(' '); | ||
183 | } | ||
184 | |||
185 | newline_ret: | ||
186 | if (nflag) { | ||
187 | putchar('\n'); | ||
188 | } | ||
189 | ret: | ||
190 | niro | 984 | return fflush_all(); |
191 | niro | 816 | } |
192 | |||
193 | /*- | ||
194 | * Copyright (c) 1991, 1993 | ||
195 | * The Regents of the University of California. All rights reserved. | ||
196 | * | ||
197 | * This code is derived from software contributed to Berkeley by | ||
198 | * Kenneth Almquist. | ||
199 | * | ||
200 | * Redistribution and use in source and binary forms, with or without | ||
201 | * modification, are permitted provided that the following conditions | ||
202 | * are met: | ||
203 | * 1. Redistributions of source code must retain the above copyright | ||
204 | * notice, this list of conditions and the following disclaimer. | ||
205 | * 2. Redistributions in binary form must reproduce the above copyright | ||
206 | * notice, this list of conditions and the following disclaimer in the | ||
207 | * documentation and/or other materials provided with the distribution. | ||
208 | * | ||
209 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change | ||
210 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> | ||
211 | * | ||
212 | * California, Berkeley and its contributors. | ||
213 | * 4. Neither the name of the University nor the names of its contributors | ||
214 | * may be used to endorse or promote products derived from this software | ||
215 | * without specific prior written permission. | ||
216 | * | ||
217 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
218 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
219 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
220 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
221 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
222 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
223 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
224 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
225 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
226 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
227 | * SUCH DAMAGE. | ||
228 | * | ||
229 | * @(#)echo.c 8.1 (Berkeley) 5/31/93 | ||
230 | */ |