1 This file is echo.def, from which is created echo.c.
2 It implements the builtin "echo" in Bash.
4 Copyright (C) 1987-2002 Free Software Foundation, Inc.
6 This file is part of GNU Bash, the Bourne Again SHell.
8 Bash is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with Bash; see the file COPYING. If not, write to the Free Software
20 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
25 #if defined (HAVE_UNISTD_H)
29 #include "../bashansi.h"
37 $FUNCTION echo_builtin
39 $SHORT_DOC echo [-neE] [arg ...]
40 Output the ARGs. If -n is specified, the trailing newline is
41 suppressed. If the -e option is given, interpretation of the
42 following backslash-escaped characters is turned on:
45 \c suppress trailing newline
53 \0nnn the character whose ASCII code is NNN (octal). NNN can be
56 You can explicitly turn off the interpretation of the above characters
61 $FUNCTION echo_builtin
63 $SHORT_DOC echo [-n] [arg ...]
64 Output the ARGs. If -n is specified, the trailing newline is suppressed.
68 # define VALID_ECHO_OPTIONS "neE"
70 # define VALID_ECHO_OPTIONS "n"
73 /* System V machines already have a /bin/sh with a v9 behaviour. We
74 give Bash the identical behaviour for these machines so that the
75 existing system shells won't barf. Regrettably, the SUS v2 has
76 standardized the Sys V echo behavior. This variable is external
77 so that we can have a `shopt' variable to control it at runtime. */
78 #if defined (DEFAULT_ECHO_TO_XPG) || defined (STRICT_POSIX)
82 #endif /* DEFAULT_ECHO_TO_XPG */
84 extern int posixly_correct;
86 /* Print the words in LIST to standard output. If the first word is
87 `-n', then don't print a trailing newline. We also support the
88 echo syntax from Version 9 Unix systems. */
93 int display_return, do_v9, i, len;
99 if (posixly_correct && xpg_echo)
102 for (; list && (temp = list->word->word) && *temp == '-'; list = list->next)
104 /* If it appears that we are handling options, then make sure that
105 all of the options specified are actually valid. Otherwise, the
106 string should just be echoed. */
109 for (i = 0; temp[i]; i++)
111 if (strchr (VALID_ECHO_OPTIONS, temp[i]) == 0)
115 /* echo - and echo -<nonopt> both mean to just echo the arguments. */
116 if (*temp == 0 || temp[i])
119 /* All of the options in TEMP are valid options to ECHO.
128 #if defined (V9_ECHO)
137 goto just_echo; /* XXX */
144 clearerr (stdout); /* clear error before writing and testing success */
149 temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), 1, &i, &len)
155 for (s = temp; len > 0; len--)
161 fflush (stdout); /* Fix for bug in SunOS 5.5 printf(3) */
183 return (EXECUTION_FAILURE);
185 return (EXECUTION_SUCCESS);