shell.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:3k
- /* shell.c -- readline utility functions that are normally provided by
- bash when readline is linked as part of the shell. */
- /* Copyright (C) 1997 Free Software Foundation, Inc.
- This file is part of the GNU Readline Library, a library for
- reading lines of text with interactive input and history editing.
- The GNU Readline Library 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 1, or
- (at your option) any later version.
- The GNU Readline Library 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.
- The GNU General Public License is often shipped with GNU software, and
- is generally kept in a file called COPYING or LICENSE. If you do not
- have a copy of the license, write to the Free Software Foundation,
- 675 Mass Ave, Cambridge, MA 02139, USA. */
- #define READLINE_LIBRARY
- #if defined (HAVE_CONFIG_H)
- # include <config.h>
- #endif
- #include <sys/types.h>
- #if defined (HAVE_UNISTD_H)
- # include <unistd.h>
- #endif /* HAVE_UNISTD_H */
- #if defined (HAVE_STDLIB_H)
- # include <stdlib.h>
- #else
- # include "ansi_stdlib.h"
- #endif /* HAVE_STDLIB_H */
- #if defined (HAVE_STDIO_H)
- # include <stdio.h>
- #endif /* HAVE_STDIO_H */
- #if defined (HAVE_STRING_H)
- # include <string.h>
- #else
- # include <strings.h>
- #endif /* !HAVE_STRING_H */
- #include <pwd.h>
- #if !defined (HAVE_GETPW_DECLS)
- extern struct passwd *getpwuid ();
- #endif /* !HAVE_GETPW_DECLS */
- extern char *xmalloc ();
- /* All of these functions are resolved from bash if we are linking readline
- as part of bash. */
- /* Does shell-like quoting using single quotes. */
- char *
- single_quote (string)
- char *string;
- {
- register int c;
- char *result, *r, *s;
- result = (char *)xmalloc (3 + (3 * strlen (string)));
- r = result;
- *r++ = ''';
- for (s = string; s && (c = *s); s++)
- {
- *r++ = c;
- if (c == ''')
- {
- *r++ = '\'; /* insert escaped single quote */
- *r++ = ''';
- *r++ = '''; /* start new quoted string */
- }
- }
- *r++ = ''';
- *r = ' ';
- return (result);
- }
- /* Set the environment variables LINES and COLUMNS to lines and cols,
- respectively. */
- void
- set_lines_and_columns (lines, cols)
- int lines, cols;
- {
- char *b;
- #if defined (HAVE_PUTENV)
- b = xmalloc (24);
- sprintf (b, "LINES=%d", lines);
- putenv (b);
- b = xmalloc (24);
- sprintf (b, "COLUMNS=%d", cols);
- putenv (b);
- #else /* !HAVE_PUTENV */
- # if defined (HAVE_SETENV)
- b = xmalloc (8);
- sprintf (b, "%d", lines);
- setenv ("LINES", b, 1);
- b = xmalloc (8);
- sprintf (b, "%d", cols);
- setenv ("COLUMNS", b, 1);
- # endif /* HAVE_SETENV */
- #endif /* !HAVE_PUTENV */
- }
- char *
- get_env_value (varname)
- char *varname;
- {
- return ((char *)getenv (varname));
- }
- char *
- get_home_dir ()
- {
- char *home_dir;
- struct passwd *entry;
- home_dir = (char *)NULL;
- entry = getpwuid (getuid ());
- if (entry)
- home_dir = entry->pw_dir;
- return (home_dir);
- }