source: rtems/cpukit/libmisc/shell/main_echo.c @ f1d9293e

4.115
Last change on this file since f1d9293e was f1d9293e, checked in by Ralf Corsepius <ralf.corsepius@…>, on 12/04/11 at 09:51:48

2011-12-04 Ralf Corsépius <ralf.corsepius@…>

  • libmisc/shell/cmds.c: Make rtems_shell_main_monitor static.
  • libmisc/shell/main_alias.c: Make rtems_shell_rtems_main_alias static.
  • libmisc/shell/main_blksync.c: Make rtems_shell_main_blksync static.
  • libmisc/shell/main_cat.c: Make rtems_shell_main_cat static.
  • libmisc/shell/main_chdir.c: Make rtems_shell_main_chdir static.
  • libmisc/shell/main_chmod.c: Make rtems_shell_main_chmod static.
  • libmisc/shell/main_chroot.c: Make rtems_shell_main_chroot static.
  • libmisc/shell/main_cp.c: Make rtems_shell_cp_exit, rtems_shell_main_cp static.
  • libmisc/shell/main_cpuuse.c: Make rtems_shell_main_cpuuse static.
  • libmisc/shell/main_date.c: Make rtems_shell_main_date static.
  • libmisc/shell/main_dd.c: Make rtems_shell_main_dd static.
  • libmisc/shell/main_echo.c: Make rtems_shell_main_echo static.
  • libmisc/shell/main_getenv.c: Make rtems_shell_main_getenv static.
  • libmisc/shell/main_halt.c: Make rtems_shell_main_halt static.
  • Property mode set to 100644
File size: 4.1 KB
Line 
1/*  $NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $  */
2
3/*-
4 * Copyright (c) 1991, 1993
5 *  The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *  @(#)echo.c  8.1 (Berkeley) 5/31/93
35 */
36
37/*
38 * Echo command.
39 *
40 * echo is steeped in tradition - several of them!
41 * netbsd has supported 'echo [-n | -e] args' in spite of -e not being
42 * documented anywhere.
43 * Posix requires that -n be supported, output from strings containing
44 * \ is implementation defined
45 * The Single Unix Spec requires that \ escapes be treated as if -e
46 * were set, but that -n not be treated as an option.
47 * (ksh supports 'echo [-eEn] args', but not -- so that it is actually
48 * impossible to actually output '-n')
49 *
50 * It is suggested that 'printf "%b" "string"' be used to get \ sequences
51 * expanded.  printf is now a builtin of netbsd's sh and csh.
52 */
53
54/*
55 *  $Id$
56 */
57
58#ifdef HAVE_CONFIG_H
59#include "config.h"
60#endif
61
62#include <stdio.h>
63#include <unistd.h>
64#include <string.h>
65#include <errno.h>
66
67#include <rtems.h>
68#include <rtems/shell.h>
69#include "internal.h"
70
71
72
73static int rtems_shell_main_echo(
74  int   argc,
75  char *argv[]
76)
77{
78  char **ap;
79  char *p;
80  char c;
81  int count;
82  int nflag = 0;
83  int eflag = 0;
84
85  ap = argv;
86  if (argc)
87    ap++;
88
89  if ((p = *ap) != NULL) {
90    if (!strcmp(p, "-n")) {
91      nflag = 1;
92      ap++;
93    } else if (!strcmp(p, "-e")) {
94      eflag = 1;
95      ap++;
96    }
97  }
98
99  while ((p = *ap++) != NULL) {
100    while ((c = *p++) != '\0') {
101      if (c == '\\' && eflag) {
102        switch (*p++) {
103        case 'a':  c = '\a';  break;  /* bell */
104        case 'b':  c = '\b';  break;
105        case 'c':  return 0;    /* exit */
106        case 'e':  c =  033;  break;  /* escape */
107        case 'f':  c = '\f';  break;
108        case 'n':  c = '\n';  break;
109        case 'r':  c = '\r';  break;
110        case 't':  c = '\t';  break;
111        case 'v':  c = '\v';  break;
112        case '\\':  break;    /* c = '\\' */
113        case '0':
114          c = 0;
115          count = 3;
116          while (--count >= 0 && (unsigned)(*p - '0') < 8)
117            c = (c << 3) + (*p++ - '0');
118          break;
119        default:
120          /* Output the '/' and char following */
121          p--;
122          break;
123        }
124      }
125      putchar(c);
126    }
127    if (*ap)
128      putchar(' ');
129  }
130  if (! nflag)
131    putchar('\n');
132  return 0;
133}
134
135rtems_shell_cmd_t rtems_shell_ECHO_Command = {
136  "echo",                        /* name */
137  "echo [args]",                 /* usage */
138  "misc",                        /* topic */
139  rtems_shell_main_echo,         /* command */
140  NULL,                          /* alias */
141  NULL                           /* next */
142};
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