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This file is echodef, from which is created echoc
It implements the builtin "echo" in Bash
Copyright (C) 1987-2002 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, 59 Temple Place, Suite 330, Boston, MA 02111 USA
$PRODUCES echoc
#include <configh
#if defined (HAVE_UNISTD_H)
# include <unistdh
#endif
#include "../bashansih"
#include <stdioh
#include "../shellh"
$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
$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
$END
#if defined (V9_ECHO)
# define VALID_ECHO_OPTIONS "neE"
#else /* !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 */
int
echo_builtin (list)
WORD_LIST *list;
{
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
all of the options specified are actually valid Otherwise, the
string should just be echoed */
temp++;
for (i = 0; temp[i]; i++)
{
if (strchr (VALID_ECHO_OPTIONS, temp[i]) == 0)
break;
}
/* echo - and echo -<nonopt both mean to just echo the arguments */
if (*temp == 0 || temp[i])
break;
/* All of the options in TEMP are valid options to ECHO
Handle them */
while (i = *temp++)
{
switch (i)
{
case 'n':
display_return = 0;
break;
#if defined (V9_ECHO)
case 'e':
do_v9 = 1;
break;
case 'E':
do_v9 = 0;
break;
#endif /* V9_ECHO */
default:
goto just_echo; /* XXX */
}
}
}
just_echo:
clearerr (stdout); /* clear error before writing and testing success */
while (list)
{
i = len = 0;
temp = do_v9 ? ansicstr (list->word->word, STRLEN (list->word->word), 1, &i, &len)
: list->word->word;
if (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);
list = list->next;
if (i)
{
display_return = 0;
break;
}
if (list)
putchar(' ');
}
if (display_return)
putchar ('\n');
fflush (stdout);
if (ferror (stdout))
{
sh_wrerror ();
clearerr (stdout);
return (EXECUTION_FAILURE);
}
return (EXECUTION_SUCCESS);
}
|
