From ccbd1d7dc5189f4637468a8136f672e60ee0e531 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Sun, 1 Nov 1992 05:44:29 +0000 Subject: Initial revision --- src/echo.c | 179 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 179 insertions(+) create mode 100644 src/echo.c (limited to 'src/echo.c') diff --git a/src/echo.c b/src/echo.c new file mode 100644 index 000000000..cae62ce8d --- /dev/null +++ b/src/echo.c @@ -0,0 +1,179 @@ +/* echo.c, taken from Bash. +Copyright (C) 1987, 1989, 1991, 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include +#include +#include "system.h" + +/* 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 + \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 +on System V systems with the -E option. +*/ + +#define V9_ECHO + +#if defined (V9_ECHO) +# if defined (USG) +# define VALID_ECHO_OPTIONS "neE" +# else +# define VALID_ECHO_OPTIONS "ne" +# endif /* !USG */ +#else /* !V9_ECHO */ +# define VALID_ECHO_OPTIONS "n" +#endif /* !V9_ECHO */ + +/* 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. */ +void +main (argc, argv) + int argc; + char **argv; +{ + int display_return = 1, do_v9 = 0; + +/* System V machines already have a /bin/sh with a v9 behaviour. We + use the identical behaviour for these machines so that the + existing system shell scripts won't barf. */ +#if defined (V9_ECHO) && defined (USG) + do_v9 = 1; +#endif + + --argc; + ++argv; + + while (argc > 0 && *argv[0] == '-') + { + register char *temp; + register int i; + + /* 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 = argv[0] + 1; + + for (i = 0; temp[i]; i++) + { + if (rindex (VALID_ECHO_OPTIONS, temp[i]) == 0) + goto just_echo; + } + + if (!*temp) + goto just_echo; + + /* All of the options in TEMP are valid options to ECHO. + Handle them. */ + while (*temp) + { + if (*temp == 'n') + display_return = 0; +#if defined (V9_ECHO) + else if (*temp == 'e') + do_v9 = 1; +#if defined (USG) + else if (*temp == 'E') + do_v9 = 0; +#endif /* USG */ +#endif /* V9_ECHO */ + else + goto just_echo; + + temp++; + } + argc--; + argv++; + } + +just_echo: + + if (argc > 0) + { +#if defined (V9_ECHO) + if (do_v9) + { + while (argc > 0) + { + register char *s = argv[0]; + register int c; + + while (c = *s++) + { + if (c == '\\' && *s) + { + switch (c = *s++) + { + case 'a': c = '\007'; break; + case 'b': c = '\b'; break; + case 'c': display_return = 0; continue; + case 'f': c = '\f'; break; + case 'n': c = '\n'; break; + case 'r': c = '\r'; break; + case 't': c = '\t'; break; + case 'v': c = (int) 0x0B; break; + case '0': case '1': case '2': case '3': + case '4': case '5': case '6': case '7': + c -= '0'; + if (*s >= '0' && *s <= '7') + c = c * 8 + (*s++ - '0'); + if (*s >= '0' && *s <= '7') + c = c * 8 + (*s++ - '0'); + break; + case '\\': break; + default: putchar ('\\'); break; + } + } + putchar(c); + } + argc--; + argv++; + if (argc > 0) + putchar(' '); + } + } + else +#endif /* V9_ECHO */ + { + while (argc > 0) + { + fputs (argv[0], stdout); + argc--; + argv++; + if (argc > 0) + putchar (' '); + } + } + } + if (display_return) + printf ("\n"); + exit (0); +} -- cgit v1.2.3-70-g09d2