1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* echo.c, taken from Bash.
Copyright (C) 87, 89, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "version.h"
#include "long-options.h"
/* echo [-neE] [arg ...]
Output the ARGs. If -n is specified, the trailing newline is
suppressed. If the -e option is given, interpretation of the
following backslash-escaped characters is turned on:
\a alert (bell)
\b backspace
\c suppress trailing newline
\f form feed
\n new line
\r carriage return
\t horizontal tab
\v vertical tab
\\ backslash
\num the character whose ASCII code is NUM (octal).
You can explicitly turn off the interpretation of the above characters
on System V systems with the -E option.
*/
/* If defined, interpret backslash escapes if -e is given. */
#define V9_ECHO
/* If defined, interpret backslash escapes unless -E is given.
V9_ECHO must also be defined. */
#define V9_DEFAULT
#if defined (V9_ECHO)
# if defined (V9_DEFAULT)
# define VALID_ECHO_OPTIONS "neE"
# else
# define VALID_ECHO_OPTIONS "ne"
# endif /* !V9_DEFAULT */
#else /* !V9_ECHO */
# define VALID_ECHO_OPTIONS "n"
#endif /* !V9_ECHO */
/* The name this program was run with. */
char *program_name;
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("Usage: %s [OPTION]... [STRING]...\n"), program_name);
printf (_("\
Echo the STRING(s) to standard output.\n\
\n\
-n do not output the trailing newline\n\
-e (unused)\n\
-E disable interpolation of some sequences in STRINGs\n\
--help display this help and exit (should be alone)\n\
--version output version information and exit (should be alone)\n\
\n\
Without -E, the following sequences are recognized and interpolated:\n\
\n\
\\NNN the character whose ASCII code is NNN (octal)\n\
\\\\ backslash\n\
\\a alert (BEL)\n\
\\b backspace\n\
\\c suppress trailing newline\n\
\\f form feed\n\
\\n new line\n\
\\r carriage return\n\
\\t horizontal tab\n\
\\v vertical tab\n\
"));
}
exit (status);
}
/* Print the words in LIST to standard output. If the first word is
`-n', then don't print a trailing newline. We also support the
echo syntax from Version 9 unix systems. */
void
main (int argc, char **argv)
{
int display_return = 1, do_v9 = 0;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
parse_long_options (argc, argv, "echo", version_string, usage);
/* System V machines already have a /bin/sh with a v9 behaviour. We
use the identical behaviour for these machines so that the
existing system shell scripts won't barf. */
#if defined (V9_ECHO) && defined (V9_DEFAULT)
do_v9 = 1;
#endif
--argc;
++argv;
while (argc > 0 && *argv[0] == '-')
{
register char *temp;
register int i;
/* If it appears that we are handling options, then make sure that
all of the options specified are actually valid. Otherwise, the
string should just be echoed. */
temp = argv[0] + 1;
for (i = 0; temp[i]; i++)
{
if (strrchr (VALID_ECHO_OPTIONS, temp[i]) == 0)
goto just_echo;
}
if (!*temp)
goto just_echo;
/* All of the options in TEMP are valid options to ECHO.
Handle them. */
while (*temp)
{
if (*temp == 'n')
display_return = 0;
#if defined (V9_ECHO)
else if (*temp == 'e')
do_v9 = 1;
#if defined (V9_DEFAULT)
else if (*temp == 'E')
do_v9 = 0;
#endif /* V9_DEFAULT */
#endif /* V9_ECHO */
else
goto just_echo;
temp++;
}
argc--;
argv++;
}
just_echo:
if (argc > 0)
{
#if defined (V9_ECHO)
if (do_v9)
{
while (argc > 0)
{
register char *s = argv[0];
register int c;
while ((c = *s++))
{
if (c == '\\' && *s)
{
switch (c = *s++)
{
case 'a': c = '\007'; break;
case 'b': c = '\b'; break;
case 'c': display_return = 0; continue;
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = (int) 0x0B; break;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c -= '0';
if (*s >= '0' && *s <= '7')
c = c * 8 + (*s++ - '0');
if (*s >= '0' && *s <= '7')
c = c * 8 + (*s++ - '0');
break;
case '\\': break;
default: putchar ('\\'); break;
}
}
putchar(c);
}
argc--;
argv++;
if (argc > 0)
putchar(' ');
}
}
else
#endif /* V9_ECHO */
{
while (argc > 0)
{
fputs (argv[0], stdout);
argc--;
argv++;
if (argc > 0)
putchar (' ');
}
}
}
if (display_return)
putchar ('\n');
exit (0);
}
|
