1 /* Copyright (C) 1999 Free Software Foundation, Inc.
3 This file is part of GNU Bash, the Bourne Again SHell.
5 Bash is free software; you can redistribute it and/or modify it under
6 the terms of the GNU General Public License as published by the Free
7 Software Foundation; either version 2, or (at your option) any later
10 Bash is distributed in the hope that it will be useful, but WITHOUT ANY
11 WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 You should have received a copy of the GNU General Public License along
16 with Bash; see the file COPYING. If not, write to the Free Software
17 Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
21 #if defined (HAVE_UNISTD_H)
23 # include <sys/types.h>
33 /* **************************************************************** */
35 /* Functions for quoting strings to be re-read as input */
37 /* **************************************************************** */
39 /* Return a new string which is the single-quoted version of STRING.
40 Used by alias and trap, among others. */
42 sh_single_quote (string)
48 result = (char *)xmalloc (3 + (4 * strlen (string)));
52 for (s = string; s && (c = *s); s++)
58 *r++ = '\\'; /* insert escaped single quote */
60 *r++ = '\''; /* start new quoted string */
70 /* Quote STRING using double quotes. Return a new string. */
72 sh_double_quote (string)
75 register unsigned char c;
78 result = (char *)xmalloc (3 + (2 * strlen (string)));
82 for (s = string; s && (c = *s); s++)
84 if (sh_syntaxtab[c] & CBSDQUOTE)
96 /* Remove backslashes that are quoting characters that are special between
97 double quotes. Return a new string. */
99 sh_un_double_quote (string)
102 register int c, pass_next;
103 char *result, *r, *s;
105 r = result = (char *)xmalloc (strlen (string) + 1);
107 for (pass_next = 0, s = string; s && (c = *s); s++)
115 if (c == '\\' && (sh_syntaxtab[(unsigned char) s[1]] & CBSDQUOTE))
127 /* Quote special characters in STRING using backslashes. Return a new
130 sh_backslash_quote (string)
134 char *result, *r, *s;
136 result = (char *)xmalloc (2 * strlen (string) + 1);
138 for (r = result, s = string; s && (c = *s); s++)
142 case ' ': case '\t': case '\n': /* IFS white space */
143 case '\'': case '"': case '\\': /* quoting chars */
144 case '|': case '&': case ';': /* shell metacharacters */
145 case '(': case ')': case '<': case '>':
146 case '!': case '{': case '}': /* reserved words */
147 case '*': case '[': case '?': case ']': /* globbing chars */
149 case '$': case '`': /* expansion chars */
150 case ',': /* brace expansion */
155 case '~': /* tilde expansion */
156 if (s == string || s[-1] == '=' || s[-1] == ':')
161 case '#': /* comment char */
175 #if defined (PROMPT_STRING_DECODE)
176 /* Quote characters that get special treatment when in double quotes in STRING
177 using backslashes. Return a new string. */
179 sh_backslash_quote_for_double_quotes (string)
183 char *result, *r, *s;
185 result = (char *)xmalloc (2 * strlen (string) + 1);
187 for (r = result, s = string; s && (c = *s); s++)
189 if (sh_syntaxtab[c] & CBSDQUOTE)
198 #endif /* PROMPT_STRING_DECODE */
201 sh_contains_shell_metas (string)
206 for (s = string; s && *s; s++)
210 case ' ': case '\t': case '\n': /* IFS white space */
211 case '\'': case '"': case '\\': /* quoting chars */
212 case '|': case '&': case ';': /* shell metacharacters */
213 case '(': case ')': case '<': case '>':
214 case '!': case '{': case '}': /* reserved words */
215 case '*': case '[': case '?': case ']': /* globbing chars */
217 case '$': case '`': /* expansion chars */
219 case '~': /* tilde expansion */
220 if (s == string || s[-1] == '=' || s[-1] == ':')
224 if (s == string) /* comment char */