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Diffstat (limited to 'cpukit/libmisc/shell/main_echo.c')
-rw-r--r-- | cpukit/libmisc/shell/main_echo.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/cpukit/libmisc/shell/main_echo.c b/cpukit/libmisc/shell/main_echo.c new file mode 100644 index 0000000000..8f868a2f29 --- /dev/null +++ b/cpukit/libmisc/shell/main_echo.c @@ -0,0 +1,142 @@ +/* $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. + */ + +/* + * $Id$ + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> + +#include <rtems.h> +#include <rtems/shell.h> +#include "internal.h" + + + +int rtems_shell_main_echo( + 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 (!strcmp(p, "-n")) { + nflag = 1; + ap++; + } else if (!strcmp(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; +} + +rtems_shell_cmd_t rtems_shell_ECHO_Command = { + "echo", /* name */ + "echo [args]", /* usage */ + "misc", /* topic */ + rtems_shell_main_echo, /* command */ + NULL, /* alias */ + NULL /* next */ +}; |