1 This file is echo.def, from which is created echo.c.
2 It implements the builtin "echo" in Bash.
4 Copyright (C) 1987, 1989, 1991 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
25 #if defined (HAVE_UNISTD_H)
33 $FUNCTION echo_builtin
35 $SHORT_DOC echo [-neE] [arg ...]
36 Output the ARGs. If -n is specified, the trailing newline is
37 suppressed. If the -e option is given, interpretation of the
38 following backslash-escaped characters is turned on:
41 \c suppress trailing newline
49 \num the character whose ASCII code is NUM (octal).
51 You can explicitly turn off the interpretation of the above characters
56 $FUNCTION echo_builtin
58 $SHORT_DOC echo [-n] [arg ...]
59 Output the ARGs. If -n is specified, the trailing newline is suppressed.
63 # define VALID_ECHO_OPTIONS "neE"
65 # define VALID_ECHO_OPTIONS "n"
68 /* Print the words in LIST to standard output. If the first word is
69 `-n', then don't print a trailing newline. We also support the
70 echo syntax from Version 9 Unix systems. */
75 int display_return, do_v9, i;
78 #if defined (DEFAULT_ECHO_TO_USG)
79 /* System V machines already have a /bin/sh with a v9 behaviour. We
80 give Bash the identical behaviour for these machines so that the
81 existing system shells won't barf. */
85 #endif /* DEFAULT_ECHO_TO_USG */
89 for (; list && (temp = list->word->word) && *temp == '-'; list = list->next)
91 /* If it appears that we are handling options, then make sure that
92 all of the options specified are actually valid. Otherwise, the
93 string should just be echoed. */
96 for (i = 0; temp[i]; i++)
98 if (strchr (VALID_ECHO_OPTIONS, temp[i]) == 0)
102 /* echo - and echo -<nonopt> both mean to just echo the arguments. */
103 if (*temp == 0 || temp[i])
106 /* All of the options in TEMP are valid options to ECHO.
115 #if defined (V9_ECHO)
124 goto just_echo; /* XXX */
134 temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), &i)
139 fflush (stdout); /* Fix for bug in SunOS 5.5 printf(3) */
156 return (EXECUTION_SUCCESS);