157 lines
3.8 KiB
Modula-2
157 lines
3.8 KiB
Modula-2
This file is echo.def, from which is created echo.c.
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It implements the builtin "echo" in Bash.
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Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 1, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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$PRODUCES echo.c
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#include <config.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include <stdio.h>
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#include "../shell.h"
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$BUILTIN echo
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$FUNCTION echo_builtin
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$DEPENDS_ON V9_ECHO
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$SHORT_DOC echo [-neE] [arg ...]
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Output the ARGs. If -n is specified, the trailing newline is
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suppressed. If the -e option is given, interpretation of the
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following backslash-escaped characters is turned on:
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\a alert (bell)
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\b backspace
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\c suppress trailing newline
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\E escape character
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\f form feed
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\n new line
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\r carriage return
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\t horizontal tab
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\v vertical tab
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\\ backslash
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\num the character whose ASCII code is NUM (octal).
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You can explicitly turn off the interpretation of the above characters
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with the -E option.
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$END
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$BUILTIN echo
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$FUNCTION echo_builtin
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$DEPENDS_ON !V9_ECHO
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$SHORT_DOC echo [-n] [arg ...]
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Output the ARGs. If -n is specified, the trailing newline is suppressed.
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$END
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#if defined (V9_ECHO)
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# define VALID_ECHO_OPTIONS "neE"
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#else /* !V9_ECHO */
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# define VALID_ECHO_OPTIONS "n"
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#endif /* !V9_ECHO */
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/* Print the words in LIST to standard output. If the first word is
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`-n', then don't print a trailing newline. We also support the
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echo syntax from Version 9 Unix systems. */
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int
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echo_builtin (list)
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WORD_LIST *list;
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{
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int display_return, do_v9, i;
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char *temp;
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#if defined (DEFAULT_ECHO_TO_USG)
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/* System V machines already have a /bin/sh with a v9 behaviour. We
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give Bash the identical behaviour for these machines so that the
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existing system shells won't barf. */
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do_v9 = 1;
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#else
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do_v9 = 0;
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#endif /* DEFAULT_ECHO_TO_USG */
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display_return = 1;
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for (; list && (temp = list->word->word) && *temp == '-'; list = list->next)
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{
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/* If it appears that we are handling options, then make sure that
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all of the options specified are actually valid. Otherwise, the
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string should just be echoed. */
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temp++;
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for (i = 0; temp[i]; i++)
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{
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if (strchr (VALID_ECHO_OPTIONS, temp[i]) == 0)
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break;
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}
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/* echo - and echo -<nonopt> both mean to just echo the arguments. */
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if (*temp == 0 || temp[i])
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break;
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/* All of the options in TEMP are valid options to ECHO.
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Handle them. */
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while (i = *temp++)
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{
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switch (i)
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{
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case 'n':
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display_return = 0;
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break;
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#if defined (V9_ECHO)
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case 'e':
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do_v9 = 1;
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break;
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case 'E':
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do_v9 = 0;
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break;
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#endif /* V9_ECHO */
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default:
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goto just_echo; /* XXX */
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}
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}
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}
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just_echo:
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while (list)
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{
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i = 0;
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temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), &i)
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: list->word->word;
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if (temp)
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{
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printf ("%s", temp);
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fflush (stdout); /* Fix for bug in SunOS 5.5 printf(3) */
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}
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if (do_v9 && temp)
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free (temp);
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list = list->next;
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if (i)
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{
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display_return = 0;
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break;
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}
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if (list)
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putchar(' ');
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}
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if (display_return)
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putchar ('\n');
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fflush (stdout);
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return (EXECUTION_SUCCESS);
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}
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