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1 | /* subst.h -- Names of externally visible functions in subst.c. */ | |
2 | ||
3 | /* Copyright (C) 1993-2010 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #if !defined (_SUBST_H_) | |
22 | #define _SUBST_H_ | |
23 | ||
24 | #include "stdc.h" | |
25 | ||
26 | /* Constants which specify how to handle backslashes and quoting in | |
27 | expand_word_internal (). Q_DOUBLE_QUOTES means to use the function | |
28 | slashify_in_quotes () to decide whether the backslash should be | |
29 | retained. Q_HERE_DOCUMENT means slashify_in_here_document () to | |
30 | decide whether to retain the backslash. Q_KEEP_BACKSLASH means | |
31 | to unconditionally retain the backslash. Q_PATQUOTE means that we're | |
32 | expanding a pattern ${var%#[#%]pattern} in an expansion surrounded | |
33 | by double quotes. Q_DOLBRACE means we are expanding a ${...} word, so | |
34 | backslashes should also escape { and } and be removed. */ | |
35 | #define Q_DOUBLE_QUOTES 0x01 | |
36 | #define Q_HERE_DOCUMENT 0x02 | |
37 | #define Q_KEEP_BACKSLASH 0x04 | |
38 | #define Q_PATQUOTE 0x08 | |
39 | #define Q_QUOTED 0x10 | |
40 | #define Q_ADDEDQUOTES 0x20 | |
41 | #define Q_QUOTEDNULL 0x40 | |
42 | #define Q_DOLBRACE 0x80 | |
43 | ||
44 | /* Flag values controlling how assignment statements are treated. */ | |
45 | #define ASS_APPEND 0x01 | |
46 | #define ASS_MKLOCAL 0x02 | |
47 | #define ASS_MKASSOC 0x04 | |
48 | ||
49 | /* Flags for the string extraction functions. */ | |
50 | #define SX_NOALLOC 0x0001 /* just skip; don't return substring */ | |
51 | #define SX_VARNAME 0x0002 /* variable name; for string_extract () */ | |
52 | #define SX_REQMATCH 0x0004 /* closing/matching delimiter required */ | |
53 | #define SX_COMMAND 0x0008 /* extracting a shell script/command */ | |
54 | #define SX_NOCTLESC 0x0010 /* don't honor CTLESC quoting */ | |
55 | #define SX_NOESCCTLNUL 0x0020 /* don't let CTLESC quote CTLNUL */ | |
56 | #define SX_NOLONGJMP 0x0040 /* don't longjmp on fatal error */ | |
57 | #define SX_ARITHSUB 0x0080 /* extracting $(( ... )) (currently unused) */ | |
58 | #define SX_POSIXEXP 0x0100 /* extracting new Posix pattern removal expansions in extract_dollar_brace_string */ | |
59 | #define SX_WORD 0x0200 /* extracting word in ${param op word} */ | |
60 | ||
61 | /* Remove backslashes which are quoting backquotes from STRING. Modifies | |
62 | STRING, and returns a pointer to it. */ | |
63 | extern char * de_backslash __P((char *)); | |
64 | ||
65 | /* Replace instances of \! in a string with !. */ | |
66 | extern void unquote_bang __P((char *)); | |
67 | ||
68 | /* Extract the $( construct in STRING, and return a new string. | |
69 | Start extracting at (SINDEX) as if we had just seen "$(". | |
70 | Make (SINDEX) get the position just after the matching ")". | |
71 | XFLAGS is additional flags to pass to other extraction functions, */ | |
72 | extern char *extract_command_subst __P((char *, int *, int)); | |
73 | ||
74 | /* Extract the $[ construct in STRING, and return a new string. | |
75 | Start extracting at (SINDEX) as if we had just seen "$[". | |
76 | Make (SINDEX) get the position just after the matching "]". */ | |
77 | extern char *extract_arithmetic_subst __P((char *, int *)); | |
78 | ||
79 | #if defined (PROCESS_SUBSTITUTION) | |
80 | /* Extract the <( or >( construct in STRING, and return a new string. | |
81 | Start extracting at (SINDEX) as if we had just seen "<(". | |
82 | Make (SINDEX) get the position just after the matching ")". */ | |
83 | extern char *extract_process_subst __P((char *, char *, int *)); | |
84 | #endif /* PROCESS_SUBSTITUTION */ | |
85 | ||
86 | /* Extract the name of the variable to bind to from the assignment string. */ | |
87 | extern char *assignment_name __P((char *)); | |
88 | ||
89 | /* Return a single string of all the words present in LIST, separating | |
90 | each word with SEP. */ | |
91 | extern char *string_list_internal __P((WORD_LIST *, char *)); | |
92 | ||
93 | /* Return a single string of all the words present in LIST, separating | |
94 | each word with a space. */ | |
95 | extern char *string_list __P((WORD_LIST *)); | |
96 | ||
97 | /* Turn $* into a single string, obeying POSIX rules. */ | |
98 | extern char *string_list_dollar_star __P((WORD_LIST *)); | |
99 | ||
100 | /* Expand $@ into a single string, obeying POSIX rules. */ | |
101 | extern char *string_list_dollar_at __P((WORD_LIST *, int)); | |
102 | ||
103 | /* Turn the positional paramters into a string, understanding quoting and | |
104 | the various subtleties of using the first character of $IFS as the | |
105 | separator. Calls string_list_dollar_at, string_list_dollar_star, and | |
106 | string_list as appropriate. */ | |
107 | extern char *string_list_pos_params __P((int, WORD_LIST *, int)); | |
108 | ||
109 | /* Perform quoted null character removal on each element of LIST. | |
110 | This modifies LIST. */ | |
111 | extern void word_list_remove_quoted_nulls __P((WORD_LIST *)); | |
112 | ||
113 | /* This performs word splitting and quoted null character removal on | |
114 | STRING. */ | |
115 | extern WORD_LIST *list_string __P((char *, char *, int)); | |
116 | ||
117 | extern char *ifs_firstchar __P((int *)); | |
118 | extern char *get_word_from_string __P((char **, char *, char **)); | |
119 | extern char *strip_trailing_ifs_whitespace __P((char *, char *, int)); | |
120 | ||
121 | /* Given STRING, an assignment string, get the value of the right side | |
122 | of the `=', and bind it to the left side. If EXPAND is true, then | |
123 | perform tilde expansion, parameter expansion, command substitution, | |
124 | and arithmetic expansion on the right-hand side. Do not perform word | |
125 | splitting on the result of expansion. */ | |
126 | extern int do_assignment __P((char *)); | |
127 | extern int do_assignment_no_expand __P((char *)); | |
128 | extern int do_word_assignment __P((WORD_DESC *, int)); | |
129 | ||
130 | /* Append SOURCE to TARGET at INDEX. SIZE is the current amount | |
131 | of space allocated to TARGET. SOURCE can be NULL, in which | |
132 | case nothing happens. Gets rid of SOURCE by free ()ing it. | |
133 | Returns TARGET in case the location has changed. */ | |
134 | extern char *sub_append_string __P((char *, char *, int *, int *)); | |
135 | ||
136 | /* Append the textual representation of NUMBER to TARGET. | |
137 | INDEX and SIZE are as in SUB_APPEND_STRING. */ | |
138 | extern char *sub_append_number __P((intmax_t, char *, int *, int *)); | |
139 | ||
140 | /* Return the word list that corresponds to `$*'. */ | |
141 | extern WORD_LIST *list_rest_of_args __P((void)); | |
142 | ||
143 | /* Make a single large string out of the dollar digit variables, | |
144 | and the rest_of_args. If DOLLAR_STAR is 1, then obey the special | |
145 | case of "$*" with respect to IFS. */ | |
146 | extern char *string_rest_of_args __P((int)); | |
147 | ||
148 | extern int number_of_args __P((void)); | |
149 | ||
150 | /* Expand STRING by performing parameter expansion, command substitution, | |
151 | and arithmetic expansion. Dequote the resulting WORD_LIST before | |
152 | returning it, but do not perform word splitting. The call to | |
153 | remove_quoted_nulls () is made here because word splitting normally | |
154 | takes care of quote removal. */ | |
155 | extern WORD_LIST *expand_string_unsplit __P((char *, int)); | |
156 | ||
157 | /* Expand the rhs of an assignment statement. */ | |
158 | extern WORD_LIST *expand_string_assignment __P((char *, int)); | |
159 | ||
160 | /* Expand a prompt string. */ | |
161 | extern WORD_LIST *expand_prompt_string __P((char *, int, int)); | |
162 | ||
163 | /* Expand STRING just as if you were expanding a word. This also returns | |
164 | a list of words. Note that filename globbing is *NOT* done for word | |
165 | or string expansion, just when the shell is expanding a command. This | |
166 | does parameter expansion, command substitution, arithmetic expansion, | |
167 | and word splitting. Dequote the resultant WORD_LIST before returning. */ | |
168 | extern WORD_LIST *expand_string __P((char *, int)); | |
169 | ||
170 | /* Convenience functions that expand strings to strings, taking care of | |
171 | converting the WORD_LIST * returned by the expand_string* functions | |
172 | to a string and deallocating the WORD_LIST *. */ | |
173 | extern char *expand_string_to_string __P((char *, int)); | |
174 | extern char *expand_string_unsplit_to_string __P((char *, int)); | |
175 | extern char *expand_assignment_string_to_string __P((char *, int)); | |
176 | ||
177 | /* Expand an arithmetic expression string */ | |
178 | extern char *expand_arith_string __P((char *, int)); | |
179 | ||
180 | /* De-quote quoted characters in STRING. */ | |
181 | extern char *dequote_string __P((char *)); | |
182 | ||
183 | /* De-quote CTLESC-escaped CTLESC or CTLNUL characters in STRING. */ | |
184 | extern char *dequote_escapes __P((char *)); | |
185 | ||
186 | /* De-quote quoted characters in each word in LIST. */ | |
187 | extern WORD_LIST *dequote_list __P((WORD_LIST *)); | |
188 | ||
189 | /* Expand WORD, performing word splitting on the result. This does | |
190 | parameter expansion, command substitution, arithmetic expansion, | |
191 | word splitting, and quote removal. */ | |
192 | extern WORD_LIST *expand_word __P((WORD_DESC *, int)); | |
193 | ||
194 | /* Expand WORD, but do not perform word splitting on the result. This | |
195 | does parameter expansion, command substitution, arithmetic expansion, | |
196 | and quote removal. */ | |
197 | extern WORD_LIST *expand_word_unsplit __P((WORD_DESC *, int)); | |
198 | extern WORD_LIST *expand_word_leave_quoted __P((WORD_DESC *, int)); | |
199 | ||
200 | /* Return the value of a positional parameter. This handles values > 10. */ | |
201 | extern char *get_dollar_var_value __P((intmax_t)); | |
202 | ||
203 | /* Quote a string to protect it from word splitting. */ | |
204 | extern char *quote_string __P((char *)); | |
205 | ||
206 | /* Quote escape characters (characters special to interals of expansion) | |
207 | in a string. */ | |
208 | extern char *quote_escapes __P((char *)); | |
209 | ||
210 | /* And remove such quoted special characters. */ | |
211 | extern char *remove_quoted_escapes __P((char *)); | |
212 | ||
213 | /* Remove CTLNUL characters from STRING unless they are quoted with CTLESC. */ | |
214 | extern char *remove_quoted_nulls __P((char *)); | |
215 | ||
216 | /* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the | |
217 | backslash quoting rules for within double quotes. */ | |
218 | extern char *string_quote_removal __P((char *, int)); | |
219 | ||
220 | /* Perform quote removal on word WORD. This allocates and returns a new | |
221 | WORD_DESC *. */ | |
222 | extern WORD_DESC *word_quote_removal __P((WORD_DESC *, int)); | |
223 | ||
224 | /* Perform quote removal on all words in LIST. If QUOTED is non-zero, | |
225 | the members of the list are treated as if they are surrounded by | |
226 | double quotes. Return a new list, or NULL if LIST is NULL. */ | |
227 | extern WORD_LIST *word_list_quote_removal __P((WORD_LIST *, int)); | |
228 | ||
229 | /* Called when IFS is changed to maintain some private variables. */ | |
230 | extern void setifs __P((SHELL_VAR *)); | |
231 | ||
232 | /* Return the value of $IFS, or " \t\n" if IFS is unset. */ | |
233 | extern char *getifs __P((void)); | |
234 | ||
235 | /* This splits a single word into a WORD LIST on $IFS, but only if the word | |
236 | is not quoted. list_string () performs quote removal for us, even if we | |
237 | don't do any splitting. */ | |
238 | extern WORD_LIST *word_split __P((WORD_DESC *, char *)); | |
239 | ||
240 | /* Take the list of words in LIST and do the various substitutions. Return | |
241 | a new list of words which is the expanded list, and without things like | |
242 | variable assignments. */ | |
243 | extern WORD_LIST *expand_words __P((WORD_LIST *)); | |
244 | ||
245 | /* Same as expand_words (), but doesn't hack variable or environment | |
246 | variables. */ | |
247 | extern WORD_LIST *expand_words_no_vars __P((WORD_LIST *)); | |
248 | ||
249 | /* Perform the `normal shell expansions' on a WORD_LIST. These are | |
250 | brace expansion, tilde expansion, parameter and variable substitution, | |
251 | command substitution, arithmetic expansion, and word splitting. */ | |
252 | extern WORD_LIST *expand_words_shellexp __P((WORD_LIST *)); | |
253 | ||
254 | extern WORD_DESC *command_substitute __P((char *, int)); | |
255 | extern char *pat_subst __P((char *, char *, char *, int)); | |
256 | ||
257 | extern int fifos_pending __P((void)); | |
258 | extern int num_fifos __P((void)); | |
259 | extern void unlink_fifo_list __P((void)); | |
260 | extern void unlink_fifo __P((int)); | |
261 | ||
262 | extern char *copy_fifo_list __P((int *)); | |
263 | extern void unlink_new_fifos __P((char *, int)); | |
264 | extern void close_new_fifos __P((char *, int)); | |
265 | ||
266 | extern WORD_LIST *list_string_with_quotes __P((char *)); | |
267 | ||
268 | #if defined (ARRAY_VARS) | |
269 | extern char *extract_array_assignment_list __P((char *, int *)); | |
270 | #endif | |
271 | ||
272 | #if defined (COND_COMMAND) | |
273 | extern char *remove_backslashes __P((char *)); | |
274 | extern char *cond_expand_word __P((WORD_DESC *, int)); | |
275 | #endif | |
276 | ||
277 | /* Flags for skip_to_delim */ | |
278 | #define SD_NOJMP 0x01 /* don't longjmp on fatal error. */ | |
279 | #define SD_INVERT 0x02 /* look for chars NOT in passed set */ | |
280 | #define SD_NOQUOTEDELIM 0x04 /* don't let single or double quotes act as delimiters */ | |
281 | #define SD_NOSKIPCMD 0x08 /* don't skip over $(, <(, or >( command/process substitution */ | |
282 | #define SD_EXTGLOB 0x10 /* skip over extended globbing patterns if appropriate */ | |
283 | ||
284 | extern int skip_to_delim __P((char *, int, char *, int)); | |
285 | ||
286 | #if defined (READLINE) | |
287 | extern int char_is_quoted __P((char *, int)); | |
288 | extern int unclosed_pair __P((char *, int, char *)); | |
289 | extern WORD_LIST *split_at_delims __P((char *, int, char *, int, int, int *, int *)); | |
290 | #endif | |
291 | ||
292 | /* Variables used to keep track of the characters in IFS. */ | |
293 | extern SHELL_VAR *ifs_var; | |
294 | extern char *ifs_value; | |
295 | extern unsigned char ifs_cmap[]; | |
296 | ||
297 | #if defined (HANDLE_MULTIBYTE) | |
298 | extern unsigned char ifs_firstc[]; | |
299 | extern size_t ifs_firstc_len; | |
300 | #else | |
301 | extern unsigned char ifs_firstc; | |
302 | #endif | |
303 | ||
304 | /* Evaluates to 1 if C is a character in $IFS. */ | |
305 | #define isifs(c) (ifs_cmap[(unsigned char)(c)] != 0) | |
306 | ||
307 | /* How to determine the quoted state of the character C. */ | |
308 | #define QUOTED_CHAR(c) ((c) == CTLESC) | |
309 | ||
310 | /* Is the first character of STRING a quoted NULL character? */ | |
311 | #define QUOTED_NULL(string) ((string)[0] == CTLNUL && (string)[1] == '\0') | |
312 | ||
313 | #endif /* !_SUBST_H_ */ |