subst.h

   1 /* subst.h -- Names of externally visible functions in subst.c. */
   2
   3 /* Copyright (C) 1993-2009 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. */
  34 #define Q_DOUBLE_QUOTES  0x01
  35 #define Q_HERE_DOCUMENT  0x02
  36 #define Q_KEEP_BACKSLASH 0x04
  37 #define Q_PATQUOTE       0x08
  38 #define Q_QUOTED         0x10
  39 #define Q_ADDEDQUOTES    0x20
  40 #define Q_QUOTEDNULL     0x40
  41
  42 /* Flag values controlling how assignment statements are treated. */
  43 #define ASS_APPEND      0x01
  44 #define ASS_MKLOCAL     0x02
  45 #define ASS_MKASSOC     0x04
  46
  47 /* Flags for the string extraction functions. */
  48 #define SX_NOALLOC      0x01    /* just skip; don't return substring */
  49 #define SX_VARNAME      0x02    /* variable name; for string_extract () */
  50 #define SX_REQMATCH     0x04    /* closing/matching delimiter required */
  51 #define SX_COMMAND      0x08    /* extracting a shell script/command */
  52 #define SX_NOCTLESC     0x10    /* don't honor CTLESC quoting */
  53 #define SX_NOESCCTLNUL  0x20    /* don't let CTLESC quote CTLNUL */
  54 #define SX_NOLONGJMP    0x40    /* don't longjmp on fatal error */
  55 #define SX_ARITHSUB     0x80    /* extracting $(( ... )) (currently unused) */
  56
  57 /* Remove backslashes which are quoting backquotes from STRING.  Modifies
  58    STRING, and returns a pointer to it. */
  59 extern char * de_backslash __P((char *));
  60
  61 /* Replace instances of \! in a string with !. */
  62 extern void unquote_bang __P((char *));
  63
  64 /* Extract the $( construct in STRING, and return a new string.
  65    Start extracting at (SINDEX) as if we had just seen "$(".
  66    Make (SINDEX) get the position just after the matching ")".
  67    XFLAGS is additional flags to pass to other extraction functions, */
  68 extern char *extract_command_subst __P((char *, int *, int));
  69
  70 /* Extract the $[ construct in STRING, and return a new string.
  71    Start extracting at (SINDEX) as if we had just seen "$[".
  72    Make (SINDEX) get the position just after the matching "]". */
  73 extern char *extract_arithmetic_subst __P((char *, int *));
  74
  75 #if defined (PROCESS_SUBSTITUTION)
  76 /* Extract the <( or >( construct in STRING, and return a new string.
  77    Start extracting at (SINDEX) as if we had just seen "<(".
  78    Make (SINDEX) get the position just after the matching ")". */
  79 extern char *extract_process_subst __P((char *, char *, int *));
  80 #endif /* PROCESS_SUBSTITUTION */
  81
  82 /* Extract the name of the variable to bind to from the assignment string. */
  83 extern char *assignment_name __P((char *));
  84
  85 /* Return a single string of all the words present in LIST, separating
  86    each word with SEP. */
  87 extern char *string_list_internal __P((WORD_LIST *, char *));
  88
  89 /* Return a single string of all the words present in LIST, separating
  90    each word with a space. */
  91 extern char *string_list __P((WORD_LIST *));
  92
  93 /* Turn $* into a single string, obeying POSIX rules. */
  94 extern char *string_list_dollar_star __P((WORD_LIST *));
  95
  96 /* Expand $@ into a single string, obeying POSIX rules. */
  97 extern char *string_list_dollar_at __P((WORD_LIST *, int));
  98
  99 /* Turn the positional paramters into a string, understanding quoting and
 100    the various subtleties of using the first character of $IFS as the
 101    separator.  Calls string_list_dollar_at, string_list_dollar_star, and
 102    string_list as appropriate. */
 103 extern char *string_list_pos_params __P((int, WORD_LIST *, int));
 104
 105 /* Perform quoted null character removal on each element of LIST.
 106    This modifies LIST. */
 107 extern void word_list_remove_quoted_nulls __P((WORD_LIST *));
 108
 109 /* This performs word splitting and quoted null character removal on
 110    STRING. */
 111 extern WORD_LIST *list_string __P((char *, char *, int));
 112
 113 extern char *ifs_firstchar  __P((int *));
 114 extern char *get_word_from_string __P((char **, char *, char **));
 115 extern char *strip_trailing_ifs_whitespace __P((char *, char *, int));
 116
 117 /* Given STRING, an assignment string, get the value of the right side
 118    of the `=', and bind it to the left side.  If EXPAND is true, then
 119    perform tilde expansion, parameter expansion, command substitution,
 120    and arithmetic expansion on the right-hand side.  Do not perform word
 121    splitting on the result of expansion. */
 122 extern int do_assignment __P((char *));
 123 extern int do_assignment_no_expand __P((char *));
 124 extern int do_word_assignment __P((WORD_DESC *));
 125
 126 /* Append SOURCE to TARGET at INDEX.  SIZE is the current amount
 127    of space allocated to TARGET.  SOURCE can be NULL, in which
 128    case nothing happens.  Gets rid of SOURCE by free ()ing it.
 129    Returns TARGET in case the location has changed. */
 130 extern char *sub_append_string __P((char *, char *, int *, int *));
 131
 132 /* Append the textual representation of NUMBER to TARGET.
 133    INDEX and SIZE are as in SUB_APPEND_STRING. */
 134 extern char *sub_append_number __P((intmax_t, char *, int *, int *));
 135
 136 /* Return the word list that corresponds to `$*'. */
 137 extern WORD_LIST *list_rest_of_args __P((void));
 138
 139 /* Make a single large string out of the dollar digit variables,
 140    and the rest_of_args.  If DOLLAR_STAR is 1, then obey the special
 141    case of "$*" with respect to IFS. */
 142 extern char *string_rest_of_args __P((int));
 143
 144 extern int number_of_args __P((void));
 145
 146 /* Expand STRING by performing parameter expansion, command substitution,
 147    and arithmetic expansion.  Dequote the resulting WORD_LIST before
 148    returning it, but do not perform word splitting.  The call to
 149    remove_quoted_nulls () is made here because word splitting normally
 150    takes care of quote removal. */
 151 extern WORD_LIST *expand_string_unsplit __P((char *, int));
 152
 153 /* Expand the rhs of an assignment statement. */
 154 extern WORD_LIST *expand_string_assignment __P((char *, int));
 155
 156 /* Expand a prompt string. */
 157 extern WORD_LIST *expand_prompt_string __P((char *, int, int));
 158
 159 /* Expand STRING just as if you were expanding a word.  This also returns
 160    a list of words.  Note that filename globbing is *NOT* done for word
 161    or string expansion, just when the shell is expanding a command.  This
 162    does parameter expansion, command substitution, arithmetic expansion,
 163    and word splitting.  Dequote the resultant WORD_LIST before returning. */
 164 extern WORD_LIST *expand_string __P((char *, int));
 165
 166 /* Convenience functions that expand strings to strings, taking care of
 167    converting the WORD_LIST * returned by the expand_string* functions
 168    to a string and deallocating the WORD_LIST *. */
 169 extern char *expand_string_to_string __P((char *, int));
 170 extern char *expand_string_unsplit_to_string __P((char *, int));
 171 extern char *expand_assignment_string_to_string __P((char *, int));
 172
 173 /* Expand an arithmetic expression string */
 174 extern char *expand_arith_string __P((char *, int));
 175
 176 /* De-quote quoted characters in STRING. */
 177 extern char *dequote_string __P((char *));
 178
 179 /* De-quote CTLESC-escaped CTLESC or CTLNUL characters in STRING. */
 180 extern char *dequote_escapes __P((char *));
 181
 182 /* De-quote quoted characters in each word in LIST. */
 183 extern WORD_LIST *dequote_list __P((WORD_LIST *));
 184
 185 /* Expand WORD, performing word splitting on the result.  This does
 186    parameter expansion, command substitution, arithmetic expansion,
 187    word splitting, and quote removal. */
 188 extern WORD_LIST *expand_word __P((WORD_DESC *, int));
 189
 190 /* Expand WORD, but do not perform word splitting on the result.  This
 191    does parameter expansion, command substitution, arithmetic expansion,
 192    and quote removal. */
 193 extern WORD_LIST *expand_word_unsplit __P((WORD_DESC *, int));
 194 extern WORD_LIST *expand_word_leave_quoted __P((WORD_DESC *, int));
 195
 196 /* Return the value of a positional parameter.  This handles values > 10. */
 197 extern char *get_dollar_var_value __P((intmax_t));
 198
 199 /* Quote a string to protect it from word splitting. */
 200 extern char *quote_string __P((char *));
 201
 202 /* Quote escape characters (characters special to interals of expansion)
 203    in a string. */
 204 extern char *quote_escapes __P((char *));
 205
 206 /* And remove such quoted special characters. */
 207 extern char *remove_quoted_escapes __P((char *));
 208
 209 /* Remove CTLNUL characters from STRING unless they are quoted with CTLESC. */
 210 extern char *remove_quoted_nulls __P((char *));
 211
 212 /* Perform quote removal on STRING.  If QUOTED > 0, assume we are obeying the
 213    backslash quoting rules for within double quotes. */
 214 extern char *string_quote_removal __P((char *, int));
 215
 216 /* Perform quote removal on word WORD.  This allocates and returns a new
 217    WORD_DESC *. */
 218 extern WORD_DESC *word_quote_removal __P((WORD_DESC *, int));
 219
 220 /* Perform quote removal on all words in LIST.  If QUOTED is non-zero,
 221    the members of the list are treated as if they are surrounded by
 222    double quotes.  Return a new list, or NULL if LIST is NULL. */
 223 extern WORD_LIST *word_list_quote_removal __P((WORD_LIST *, int));
 224
 225 /* Called when IFS is changed to maintain some private variables. */
 226 extern void setifs __P((SHELL_VAR *));
 227
 228 /* Return the value of $IFS, or " \t\n" if IFS is unset. */
 229 extern char *getifs __P((void));
 230
 231 /* This splits a single word into a WORD LIST on $IFS, but only if the word
 232    is not quoted.  list_string () performs quote removal for us, even if we
 233    don't do any splitting. */
 234 extern WORD_LIST *word_split __P((WORD_DESC *, char *));
 235
 236 /* Take the list of words in LIST and do the various substitutions.  Return
 237    a new list of words which is the expanded list, and without things like
 238    variable assignments. */
 239 extern WORD_LIST *expand_words __P((WORD_LIST *));
 240
 241 /* Same as expand_words (), but doesn't hack variable or environment
 242    variables. */
 243 extern WORD_LIST *expand_words_no_vars __P((WORD_LIST *));
 244
 245 /* Perform the `normal shell expansions' on a WORD_LIST.  These are
 246    brace expansion, tilde expansion, parameter and variable substitution,
 247    command substitution, arithmetic expansion, and word splitting. */
 248 extern WORD_LIST *expand_words_shellexp __P((WORD_LIST *));
 249
 250 extern WORD_DESC *command_substitute __P((char *, int));
 251 extern char *pat_subst __P((char *, char *, char *, int));
 252
 253 extern int fifos_pending __P((void));
 254 extern void unlink_fifo_list __P((void));
 255
 256 extern WORD_LIST *list_string_with_quotes __P((char *));
 257
 258 #if defined (ARRAY_VARS)
 259 extern char *extract_array_assignment_list __P((char *, int *));
 260 #endif
 261
 262 #if defined (COND_COMMAND)
 263 extern char *remove_backslashes __P((char *));
 264 extern char *cond_expand_word __P((WORD_DESC *, int));
 265 #endif
 266
 267 /* Flags for skip_to_delim */
 268 #define SD_NOJMP        0x01    /* don't longjmp on fatal error. */
 269 #define SD_INVERT       0x02    /* look for chars NOT in passed set */
 270 #define SD_NOQUOTEDELIM 0x04    /* don't let single or double quotes act as delimiters */
 271 #define SD_NOSKIPCMD    0x08    /* don't skip over $(, <(, or >( command/process substitution */
 272
 273 extern int skip_to_delim __P((char *, int, char *, int));
 274
 275 #if defined (READLINE)
 276 extern int char_is_quoted __P((char *, int));
 277 extern int unclosed_pair __P((char *, int, char *));
 278 extern WORD_LIST *split_at_delims __P((char *, int, char *, int, int, int *, int *));
 279 #endif
 280
 281 /* Variables used to keep track of the characters in IFS. */
 282 extern SHELL_VAR *ifs_var;
 283 extern char *ifs_value;
 284 extern unsigned char ifs_cmap[];
 285
 286 #if defined (HANDLE_MULTIBYTE)
 287 extern unsigned char ifs_firstc[];
 288 extern size_t ifs_firstc_len;
 289 #else
 290 extern unsigned char ifs_firstc;
 291 #endif
 292
 293 /* Evaluates to 1 if C is a character in $IFS. */
 294 #define isifs(c)        (ifs_cmap[(unsigned char)(c)] != 0)
 295
 296 /* How to determine the quoted state of the character C. */
 297 #define QUOTED_CHAR(c)  ((c) == CTLESC)
 298
 299 /* Is the first character of STRING a quoted NULL character? */
 300 #define QUOTED_NULL(string) ((string)[0] == CTLNUL && (string)[1] == '\0')
 301
 302 #endif /* !_SUBST_H_ */