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94
system/core/sh/bltin/bltin.h Normal file
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/* $NetBSD: bltin.h,v 1.11 2003/08/07 09:05:40 agc Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)bltin.h 8.1 (Berkeley) 5/31/93
*/
/*
* This file is included by programs which are optionally built into the
* shell. If SHELL is defined, we try to map the standard UNIX library
* routines to ash routines using defines.
*/
#include "../shell.h"
#include "../mystring.h"
#ifdef SHELL
#include "../output.h"
#include "../error.h"
#undef stdout
#undef stderr
#undef putc
#undef putchar
#undef fileno
#define stdout out1
#define stderr out2
#define printf out1fmt
#define putc(c, file) outc(c, file)
#define putchar(c) out1c(c)
#define FILE struct output
#define fprintf outfmt
#define fputs outstr
#define fflush flushout
#define fileno(f) ((f)->fd)
#define INITARGS(argv)
#define err sh_err
#define verr sh_verr
#define errx sh_errx
#define verrx sh_verrx
#define warn sh_warn
#define vwarn sh_vwarn
#define warnx sh_warnx
#define vwarnx sh_vwarnx
#define exit sh_exit
#define setprogname(s)
#define getprogname() commandname
#define setlocate(l,s) 0
#define getenv(p) bltinlookup((p),0)
#else
#undef NULL
#include <stdio.h>
#undef main
#define INITARGS(argv) if ((commandname = argv[0]) == NULL) {fputs("Argc is zero\n", stderr); exit(2);} else
#endif
pointer stalloc(int);
void error(const char *, ...);
void sh_warnx(const char *, ...);
void sh_exit(int) __attribute__((__noreturn__));
int echocmd(int, char **);
extern const char *commandname;

109
system/core/sh/bltin/echo.1 Normal file
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.\" $NetBSD: echo.1,v 1.13 2003/08/07 09:05:40 agc Exp $
.\"
.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Kenneth Almquist.
.\" Copyright 1989 by Kenneth Almquist
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)echo.1 8.1 (Berkeley) 5/31/93
.\"
.Dd May 31, 1993
.Dt ECHO 1
.Os
.Sh NAME
.Nm echo
.Nd produce message in a shell script
.Sh SYNOPSIS
.Nm
.Op Fl n | Fl e
.Ar args ...
.Sh DESCRIPTION
.Nm
prints its arguments on the standard output, separated by spaces.
Unless the
.Fl n
option is present, a newline is output following the arguments.
The
.Fl e
option causes
.Nm
to treat the escape sequences specially, as described in the following
paragraph.
The
.Fl e
option is the default, and is provided solely for compatibility with
other systems.
Only one of the options
.Fl n
and
.Fl e
may be given.
.Pp
If any of the following sequences of characters is encountered during
output, the sequence is not output. Instead, the specified action is
performed:
.Bl -tag -width indent
.It Li \eb
A backspace character is output.
.It Li \ec
Subsequent output is suppressed. This is normally used at the end of the
last argument to suppress the trailing newline that
.Nm
would otherwise output.
.It Li \ef
Output a form feed.
.It Li \en
Output a newline character.
.It Li \er
Output a carriage return.
.It Li \et
Output a (horizontal) tab character.
.It Li \ev
Output a vertical tab.
.It Li \e0 Ns Ar digits
Output the character whose value is given by zero to three digits.
If there are zero digits, a nul character is output.
.It Li \e\e
Output a backslash.
.El
.Sh HINTS
Remember that backslash is special to the shell and needs to be escaped.
To output a message to standard error, say
.Pp
.D1 echo message \*[Gt]\*[Am]2
.Sh BUGS
The octal character escape mechanism
.Pq Li \e0 Ns Ar digits
differs from the
C language mechanism.
.Pp
There is no way to force
.Nm
to treat its arguments literally, rather than interpreting them as
options and escape sequences.

116
system/core/sh/bltin/echo.c Normal file
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/* $NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)echo.c 8.1 (Berkeley) 5/31/93
*/
/*
* Echo command.
*
* echo is steeped in tradition - several of them!
* netbsd has supported 'echo [-n | -e] args' in spite of -e not being
* documented anywhere.
* Posix requires that -n be supported, output from strings containing
* \ is implementation defined
* The Single Unix Spec requires that \ escapes be treated as if -e
* were set, but that -n not be treated as an option.
* (ksh supports 'echo [-eEn] args', but not -- so that it is actually
* impossible to actually output '-n')
*
* It is suggested that 'printf "%b" "string"' be used to get \ sequences
* expanded. printf is now a builtin of netbsd's sh and csh.
*/
//#define main echocmd
#include "bltin.h"
int
echocmd(int argc, char **argv)
{
char **ap;
char *p;
char c;
int count;
int nflag = 0;
int eflag = 0;
ap = argv;
if (argc)
ap++;
if ((p = *ap) != NULL) {
if (equal(p, "-n")) {
nflag = 1;
ap++;
} else if (equal(p, "-e")) {
eflag = 1;
ap++;
}
}
while ((p = *ap++) != NULL) {
while ((c = *p++) != '\0') {
if (c == '\\' && eflag) {
switch (*p++) {
case 'a': c = '\a'; break; /* bell */
case 'b': c = '\b'; break;
case 'c': return 0; /* exit */
case 'e': c = 033; break; /* escape */
case 'f': c = '\f'; break;
case 'n': c = '\n'; break;
case 'r': c = '\r'; break;
case 't': c = '\t'; break;
case 'v': c = '\v'; break;
case '\\': break; /* c = '\\' */
case '0':
c = 0;
count = 3;
while (--count >= 0 && (unsigned)(*p - '0') < 8)
c = (c << 3) + (*p++ - '0');
break;
default:
/* Output the '/' and char following */
p--;
break;
}
}
putchar(c);
}
if (*ap)
putchar(' ');
}
if (! nflag)
putchar('\n');
return 0;
}