This file is echo.def, from which is created echo.c.
It implements the builtin "echo" in Bash.
-Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
+Copyright (C) 1987-2009 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 1, or (at your option) any later
-version.
+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 3 of the License, 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.
+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.
+You should have received a copy of the GNU General Public License
+along with Bash. If not, see <http://www.gnu.org/licenses/>.
$PRODUCES echo.c
#include <config.h>
# include <unistd.h>
#endif
+#include "../bashansi.h"
+
#include <stdio.h>
#include "../shell.h"
+#include "common.h"
+
$BUILTIN echo
$FUNCTION echo_builtin
$DEPENDS_ON V9_ECHO
$SHORT_DOC 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
- \E escape character
- \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
-with the -E option.
+Write arguments to the standard output.
+
+Display the ARGs on the standard output followed by a newline.
+
+Options:
+ -n do not append a newline
+ -e enable interpretation of the following backslash escapes
+ -E explicitly suppress interpretation of backslash escapes
+
+`echo' interprets the following backslash-escaped characters:
+ \a alert (bell)
+ \b backspace
+ \c suppress further output
+ \e escape character
+ \f form feed
+ \n new line
+ \r carriage return
+ \t horizontal tab
+ \v vertical tab
+ \\ backslash
+ \0nnn the character whose ASCII code is NNN (octal). NNN can be
+ 0 to 3 octal digits
+ \xHH the eight-bit character whose value is HH (hexadecimal). HH
+ can be one or two hex digits
+
+Exit Status:
+Returns success unless a write error occurs.
$END
$BUILTIN echo
$FUNCTION echo_builtin
$DEPENDS_ON !V9_ECHO
$SHORT_DOC echo [-n] [arg ...]
-Output the ARGs. If -n is specified, the trailing newline is suppressed.
+Write arguments to the standard output.
+
+Display the ARGs on the standard output followed by a newline.
+
+Options:
+ -n do not append a newline
+
+Exit Status:
+Returns success unless a write error occurs.
$END
#if defined (V9_ECHO)
# define VALID_ECHO_OPTIONS "n"
#endif /* !V9_ECHO */
+/* System V machines already have a /bin/sh with a v9 behaviour. We
+ give Bash the identical behaviour for these machines so that the
+ existing system shells won't barf. Regrettably, the SUS v2 has
+ standardized the Sys V echo behavior. This variable is external
+ so that we can have a `shopt' variable to control it at runtime. */
+#if defined (DEFAULT_ECHO_TO_XPG) || defined (STRICT_POSIX)
+int xpg_echo = 1;
+#else
+int xpg_echo = 0;
+#endif /* DEFAULT_ECHO_TO_XPG */
+
+extern int posixly_correct;
+
/* 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. */
echo_builtin (list)
WORD_LIST *list;
{
- int display_return, do_v9, i;
- char *temp;
-
-#if defined (DEFAULT_ECHO_TO_USG)
-/* System V machines already have a /bin/sh with a v9 behaviour. We
- give Bash the identical behaviour for these machines so that the
- existing system shells won't barf. */
- do_v9 = 1;
-#else
- do_v9 = 0;
-#endif /* DEFAULT_ECHO_TO_USG */
+ int display_return, do_v9, i, len;
+ char *temp, *s;
+ do_v9 = xpg_echo;
display_return = 1;
+ if (posixly_correct && xpg_echo)
+ goto just_echo;
+
for (; list && (temp = list->word->word) && *temp == '-'; list = list->next)
{
/* If it appears that we are handling options, then make sure that
just_echo:
+ clearerr (stdout); /* clear error before writing and testing success */
+
+ terminate_immediately++;
while (list)
{
- i = 0;
- temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), &i)
+ i = len = 0;
+ temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), 1, &i, &len)
: list->word->word;
if (temp)
{
- printf ("%s", temp);
+ if (do_v9)
+ {
+ for (s = temp; len > 0; len--)
+ putchar (*s++);
+ }
+ else
+ printf ("%s", temp);
+#if defined (SunOS5)
fflush (stdout); /* Fix for bug in SunOS 5.5 printf(3) */
+#endif
}
if (do_v9 && temp)
free (temp);
if (display_return)
putchar ('\n');
- fflush (stdout);
- return (EXECUTION_SUCCESS);
+
+ terminate_immediately--;
+ return (sh_chkwrite (EXECUTION_SUCCESS));
}
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