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)
86 else if (c == CTLESC || c == CTLNUL)
87 *r++ = CTLESC; /* could be '\\'? */
98 /* Remove backslashes that are quoting characters that are special between
99 double quotes. Return a new string. XXX - should this handle CTLESC
102 sh_un_double_quote (string)
105 register int c, pass_next;
106 char *result, *r, *s;
108 r = result = (char *)xmalloc (strlen (string) + 1);
110 for (pass_next = 0, s = string; s && (c = *s); s++)
118 if (c == '\\' && (sh_syntaxtab[(unsigned char) s[1]] & CBSDQUOTE))
130 /* Quote special characters in STRING using backslashes. Return a new
133 sh_backslash_quote (string)
137 char *result, *r, *s;
139 result = (char *)xmalloc (2 * strlen (string) + 1);
141 for (r = result, s = string; s && (c = *s); s++)
145 case ' ': case '\t': case '\n': /* IFS white space */
146 case '\'': case '"': case '\\': /* quoting chars */
147 case '|': case '&': case ';': /* shell metacharacters */
148 case '(': case ')': case '<': case '>':
149 case '!': case '{': case '}': /* reserved words */
150 case '*': case '[': case '?': case ']': /* globbing chars */
152 case '$': case '`': /* expansion chars */
153 case ',': /* brace expansion */
158 case '~': /* tilde expansion */
159 if (s == string || s[-1] == '=' || s[-1] == ':')
164 case CTLESC: case CTLNUL: /* internal quoting characters */
165 *r++ = CTLESC; /* could be '\\'? */
169 case '#': /* comment char */
183 #if defined (PROMPT_STRING_DECODE)
184 /* Quote characters that get special treatment when in double quotes in STRING
185 using backslashes. Return a new string. */
187 sh_backslash_quote_for_double_quotes (string)
191 char *result, *r, *s;
193 result = (char *)xmalloc (2 * strlen (string) + 1);
195 for (r = result, s = string; s && (c = *s); s++)
197 if (sh_syntaxtab[c] & CBSDQUOTE)
199 /* I should probably add flags for these to sh_syntaxtab[] */
200 else if (c == CTLESC || c == CTLNUL)
201 *r++ = CTLESC; /* could be '\\'? */
209 #endif /* PROMPT_STRING_DECODE */
212 sh_contains_shell_metas (string)
217 for (s = string; s && *s; s++)
221 case ' ': case '\t': case '\n': /* IFS white space */
222 case '\'': case '"': case '\\': /* quoting chars */
223 case '|': case '&': case ';': /* shell metacharacters */
224 case '(': case ')': case '<': case '>':
225 case '!': case '{': case '}': /* reserved words */
226 case '*': case '[': case '?': case ']': /* globbing chars */
228 case '$': case '`': /* expansion chars */
230 case '~': /* tilde expansion */
231 if (s == string || s[-1] == '=' || s[-1] == ':')
235 if (s == string) /* comment char */