[thirdparty/bash.git] / subst.h

/* subst.h -- Names of externally visible functions in subst.c. */

/* Copyright (C) 1993-2021 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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 3 of the License, or
   (at your option) any later version.

   Bash 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.

   You should have received a copy of the GNU General Public License
   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
*/

#if !defined (_SUBST_H_)
#define _SUBST_H_

#include "stdc.h"

/* Constants which specify how to handle backslashes and quoting in
   expand_word_internal ().  Q_DOUBLE_QUOTES means to use the function
   slashify_in_quotes () to decide whether the backslash should be
   retained.  Q_HERE_DOCUMENT means slashify_in_here_document () to
   decide whether to retain the backslash.  Q_KEEP_BACKSLASH means
   to unconditionally retain the backslash.  Q_PATQUOTE means that we're
   expanding a pattern ${var%#[#%]pattern} in an expansion surrounded
   by double quotes. Q_DOLBRACE means we are expanding a ${...} word, so
   backslashes should also escape { and } and be removed. */
#define Q_DOUBLE_QUOTES  0x001
#define Q_HERE_DOCUMENT  0x002
#define Q_KEEP_BACKSLASH 0x004
#define Q_PATQUOTE	 0x008
#define Q_QUOTED	 0x010
#define Q_ADDEDQUOTES	 0x020
#define Q_QUOTEDNULL	 0x040
#define Q_DOLBRACE	 0x080
#define Q_ARITH		 0x100	/* expanding string for arithmetic evaluation */
#define Q_ARRAYSUB	 0x200	/* expanding indexed array subscript */

/* Flag values controlling how assignment statements are treated. */
#define ASS_APPEND	0x0001
#define ASS_MKLOCAL	0x0002
#define ASS_MKASSOC	0x0004
#define ASS_MKGLOBAL	0x0008	/* force global assignment */
#define ASS_NAMEREF	0x0010	/* assigning to nameref variable */
#define ASS_FORCE	0x0020	/* force assignment even to readonly variable */
#define ASS_CHKLOCAL	0x0040	/* check local variable before assignment */
#define ASS_NOEXPAND	0x0080	/* don't expand associative array subscripts */
#define ASS_NOEVAL	0x0100	/* don't evaluate value as expression */
#define ASS_NOLONGJMP	0x0200	/* don't longjmp on fatal assignment error */
#define ASS_NOINVIS	0x0400	/* don't resolve local invisible variables */
#define ASS_ALLOWALLSUB	0x0800	/* allow * and @ as associative array keys */
#define ASS_ONEWORD	0x1000	/* don't check array subscripts, assume higher level has done that */

/* Flags for the string extraction functions. */
#define SX_NOALLOC	0x0001	/* just skip; don't return substring */
#define SX_VARNAME	0x0002	/* variable name; for string_extract () */
#define SX_REQMATCH	0x0004	/* closing/matching delimiter required */
#define SX_COMMAND	0x0008	/* extracting a shell script/command */
#define SX_NOCTLESC	0x0010	/* don't honor CTLESC quoting */
#define SX_NOESCCTLNUL	0x0020	/* don't let CTLESC quote CTLNUL */
#define SX_NOLONGJMP	0x0040	/* don't longjmp on fatal error */
#define SX_ARITHSUB	0x0080	/* extracting $(( ... )) (currently unused) */
#define SX_POSIXEXP	0x0100	/* extracting new Posix pattern removal expansions in extract_dollar_brace_string */
#define SX_WORD		0x0200	/* extracting word in ${param op word} */
#define SX_COMPLETE	0x0400	/* extracting word for completion */
#define SX_STRIPDQ	0x0800	/* strip double quotes when extracting double-quoted string */
#define SX_NOERROR	0x1000	/* don't print parser error messages */

/* Remove backslashes which are quoting backquotes from STRING.  Modifies
   STRING, and returns a pointer to it. */
extern char * de_backslash PARAMS((char *));

/* Replace instances of \! in a string with !. */
extern void unquote_bang PARAMS((char *));

/* Extract the $( construct in STRING, and return a new string.
   Start extracting at (SINDEX) as if we had just seen "$(".
   Make (SINDEX) get the position just after the matching ")".
   XFLAGS is additional flags to pass to other extraction functions, */
extern char *extract_command_subst PARAMS((char *, int *, int));

/* Extract the $[ construct in STRING, and return a new string.
   Start extracting at (SINDEX) as if we had just seen "$[".
   Make (SINDEX) get the position just after the matching "]". */
extern char *extract_arithmetic_subst PARAMS((char *, int *));

#if defined (PROCESS_SUBSTITUTION)
/* Extract the <( or >( construct in STRING, and return a new string.
   Start extracting at (SINDEX) as if we had just seen "<(".
   Make (SINDEX) get the position just after the matching ")". */
extern char *extract_process_subst PARAMS((char *, char *, int *, int));
#endif /* PROCESS_SUBSTITUTION */

/* Extract the name of the variable to bind to from the assignment string. */
extern char *assignment_name PARAMS((char *));

/* Return a single string of all the words present in LIST, separating
   each word with SEP. */
extern char *string_list_internal PARAMS((WORD_LIST *, char *));

/* Return a single string of all the words present in LIST, separating
   each word with a space. */
extern char *string_list PARAMS((WORD_LIST *));

/* Turn $* into a single string, obeying POSIX rules. */
extern char *string_list_dollar_star PARAMS((WORD_LIST *, int, int));

/* Expand $@ into a single string, obeying POSIX rules. */
extern char *string_list_dollar_at PARAMS((WORD_LIST *, int, int));

/* Turn the positional parameters into a string, understanding quoting and
   the various subtleties of using the first character of $IFS as the
   separator.  Calls string_list_dollar_at, string_list_dollar_star, and
   string_list as appropriate. */
extern char *string_list_pos_params PARAMS((int, WORD_LIST *, int, int));

/* Perform quoted null character removal on each element of LIST.
   This modifies LIST. */
extern void word_list_remove_quoted_nulls PARAMS((WORD_LIST *));

/* This performs word splitting and quoted null character removal on
   STRING. */
extern WORD_LIST *list_string PARAMS((char *, char *, int));

extern char *ifs_firstchar  PARAMS((int *));
extern char *get_word_from_string PARAMS((char **, char *, char **));
extern char *strip_trailing_ifs_whitespace PARAMS((char *, char *, int));

/* Given STRING, an assignment string, get the value of the right side
   of the `=', and bind it to the left side.  If EXPAND is true, then
   perform tilde expansion, parameter expansion, command substitution,
   and arithmetic expansion on the right-hand side.  Do not perform word
   splitting on the result of expansion. */
extern int do_assignment PARAMS((char *));
extern int do_assignment_no_expand PARAMS((char *));
extern int do_word_assignment PARAMS((WORD_DESC *, int));

/* Append SOURCE to TARGET at INDEX.  SIZE is the current amount
   of space allocated to TARGET.  SOURCE can be NULL, in which
   case nothing happens.  Gets rid of SOURCE by free ()ing it.
   Returns TARGET in case the location has changed. */
extern char *sub_append_string PARAMS((char *, char *, size_t *, size_t *));

/* Append the textual representation of NUMBER to TARGET.
   INDEX and SIZE are as in SUB_APPEND_STRING. */
extern char *sub_append_number PARAMS((intmax_t, char *, int *, int *));

/* Return the word list that corresponds to `$*'. */
extern WORD_LIST *list_rest_of_args PARAMS((void));

/* Make a single large string out of the dollar digit variables,
   and the rest_of_args.  If DOLLAR_STAR is 1, then obey the special
   case of "$*" with respect to IFS. */
extern char *string_rest_of_args PARAMS((int));

/* Expand STRING by performing parameter expansion, command substitution,
   and arithmetic expansion.  Dequote the resulting WORD_LIST before
   returning it, but do not perform word splitting.  The call to
   remove_quoted_nulls () is made here because word splitting normally
   takes care of quote removal. */
extern WORD_LIST *expand_string_unsplit PARAMS((char *, int));

/* Expand the rhs of an assignment statement. */
extern WORD_LIST *expand_string_assignment PARAMS((char *, int));

/* Expand a prompt string. */
extern WORD_LIST *expand_prompt_string PARAMS((char *, int, int));

/* Expand STRING just as if you were expanding a word.  This also returns
   a list of words.  Note that filename globbing is *NOT* done for word
   or string expansion, just when the shell is expanding a command.  This
   does parameter expansion, command substitution, arithmetic expansion,
   and word splitting.  Dequote the resultant WORD_LIST before returning. */
extern WORD_LIST *expand_string PARAMS((char *, int));

/* Convenience functions that expand strings to strings, taking care of
   converting the WORD_LIST * returned by the expand_string* functions
   to a string and deallocating the WORD_LIST *. */
extern char *expand_string_to_string PARAMS((char *, int));
extern char *expand_string_unsplit_to_string PARAMS((char *, int));
extern char *expand_assignment_string_to_string PARAMS((char *, int));
extern char *expand_subscript_string PARAMS((char *, int));

/* Expand an arithmetic expression string */
extern char *expand_arith_string PARAMS((char *, int));

/* Expand $'...' and $"..." in a string for code paths that do not. */
extern char *expand_string_dollar_quote PARAMS((char *, int));

/* De-quote quoted characters in STRING. */
extern char *dequote_string PARAMS((char *));

/* De-quote CTLESC-escaped CTLESC or CTLNUL characters in STRING. */
extern char *dequote_escapes PARAMS((const char *));

extern WORD_DESC *dequote_word PARAMS((WORD_DESC *));

/* De-quote quoted characters in each word in LIST. */
extern WORD_LIST *dequote_list PARAMS((WORD_LIST *));

/* Expand WORD, performing word splitting on the result.  This does
   parameter expansion, command substitution, arithmetic expansion,
   word splitting, and quote removal. */
extern WORD_LIST *expand_word PARAMS((WORD_DESC *, int));

/* Expand WORD, but do not perform word splitting on the result.  This
   does parameter expansion, command substitution, arithmetic expansion,
   and quote removal. */
extern WORD_LIST *expand_word_unsplit PARAMS((WORD_DESC *, int));
extern WORD_LIST *expand_word_leave_quoted PARAMS((WORD_DESC *, int));

/* Return the value of a positional parameter.  This handles values > 10. */
extern char *get_dollar_var_value PARAMS((intmax_t));

/* Quote a string to protect it from word splitting. */
extern char *quote_string PARAMS((char *));

/* Quote escape characters (characters special to internals of expansion)
   in a string. */
extern char *quote_escapes PARAMS((const char *));

/* And remove such quoted special characters. */
extern char *remove_quoted_escapes PARAMS((char *));

/* Remove CTLNUL characters from STRING unless they are quoted with CTLESC. */
extern char *remove_quoted_nulls PARAMS((char *));

/* Perform quote removal on STRING.  If QUOTED > 0, assume we are obeying the
   backslash quoting rules for within double quotes. */
extern char *string_quote_removal PARAMS((char *, int));

/* Perform quote removal on word WORD.  This allocates and returns a new
   WORD_DESC *. */
extern WORD_DESC *word_quote_removal PARAMS((WORD_DESC *, int));

/* Perform quote removal on all words in LIST.  If QUOTED is non-zero,
   the members of the list are treated as if they are surrounded by
   double quotes.  Return a new list, or NULL if LIST is NULL. */
extern WORD_LIST *word_list_quote_removal PARAMS((WORD_LIST *, int));

/* Called when IFS is changed to maintain some private variables. */
extern void setifs PARAMS((SHELL_VAR *));

/* Return the value of $IFS, or " \t\n" if IFS is unset. */
extern char *getifs PARAMS((void));

/* This splits a single word into a WORD LIST on $IFS, but only if the word
   is not quoted.  list_string () performs quote removal for us, even if we
   don't do any splitting. */
extern WORD_LIST *word_split PARAMS((WORD_DESC *, char *));

/* Take the list of words in LIST and do the various substitutions.  Return
   a new list of words which is the expanded list, and without things like
   variable assignments. */
extern WORD_LIST *expand_words PARAMS((WORD_LIST *));

/* Same as expand_words (), but doesn't hack variable or environment
   variables. */
extern WORD_LIST *expand_words_no_vars PARAMS((WORD_LIST *));

/* Perform the `normal shell expansions' on a WORD_LIST.  These are
   brace expansion, tilde expansion, parameter and variable substitution,
   command substitution, arithmetic expansion, and word splitting. */
extern WORD_LIST *expand_words_shellexp PARAMS((WORD_LIST *));

extern WORD_DESC *command_substitute PARAMS((char *, int, int));
extern char *pat_subst PARAMS((char *, char *, char *, int));

#if defined (PROCESS_SUBSTITUTION)
extern int fifos_pending PARAMS((void));
extern int num_fifos PARAMS((void));
extern void unlink_fifo_list PARAMS((void));
extern void unlink_all_fifos PARAMS((void));
extern void unlink_fifo PARAMS((int));

extern void *copy_fifo_list PARAMS((int *));
extern void close_new_fifos PARAMS((void *, int));

extern void clear_fifo_list PARAMS((void));

extern int find_procsub_child PARAMS((pid_t));
extern void set_procsub_status PARAMS((int, pid_t, int));

extern void wait_procsubs PARAMS((void));
extern void reap_procsubs PARAMS((void));
#endif

extern WORD_LIST *list_string_with_quotes PARAMS((char *));

#if defined (ARRAY_VARS)
extern char *extract_array_assignment_list PARAMS((char *, int *));
#endif

#if defined (COND_COMMAND)
extern char *remove_backslashes PARAMS((char *));
extern char *cond_expand_word PARAMS((WORD_DESC *, int));
#endif

/* Flags for skip_to_delim */
#define SD_NOJMP	0x001	/* don't longjmp on fatal error. */
#define SD_INVERT	0x002	/* look for chars NOT in passed set */
#define SD_NOQUOTEDELIM	0x004	/* don't let single or double quotes act as delimiters */
#define SD_NOSKIPCMD	0x008	/* don't skip over $(, <(, or >( command/process substitution; parse them as commands */
#define SD_EXTGLOB	0x010	/* skip over extended globbing patterns if appropriate */
#define SD_IGNOREQUOTE	0x020	/* single and double quotes are not special */
#define SD_GLOB		0x040	/* skip over glob patterns like bracket expressions */
#define SD_NOPROCSUB	0x080	/* don't parse process substitutions as commands */
#define SD_COMPLETE	0x100	/* skip_to_delim during completion */
#define SD_HISTEXP	0x200	/* skip_to_delim during history expansion */
#define SD_ARITHEXP	0x400	/* skip_to_delim during arithmetic expansion */
#define SD_NOERROR	0x800	/* don't print error messages */

extern int skip_to_delim PARAMS((char *, int, char *, int));

#if defined (BANG_HISTORY)
extern int skip_to_histexp PARAMS((char *, int, char *, int));
#endif

#if defined (READLINE)
extern int char_is_quoted PARAMS((char *, int));
extern int unclosed_pair PARAMS((char *, int, char *));
extern WORD_LIST *split_at_delims PARAMS((char *, int, const char *, int, int, int *, int *));
#endif

/* Variables used to keep track of the characters in IFS. */
extern SHELL_VAR *ifs_var;
extern char *ifs_value;
extern unsigned char ifs_cmap[];
extern int ifs_is_set, ifs_is_null;

#if defined (HANDLE_MULTIBYTE)
extern unsigned char ifs_firstc[];
extern size_t ifs_firstc_len;
#else
extern unsigned char ifs_firstc;
#endif

extern int assigning_in_environment;
extern int expanding_redir;
extern int inherit_errexit;

extern pid_t last_command_subst_pid;

/* Evaluates to 1 if C is a character in $IFS. */
#define isifs(c)	(ifs_cmap[(unsigned char)(c)] != 0)

/* How to determine the quoted state of the character C. */
#define QUOTED_CHAR(c)  ((c) == CTLESC)

/* Is the first character of STRING a quoted NULL character? */
#define QUOTED_NULL(string) ((string)[0] == CTLNUL && (string)[1] == '\0')

extern void invalidate_cached_quoted_dollar_at PARAMS((void));

#endif /* !_SUBST_H_ */
Commit	Line	Data
	1	/* subst.h -- Names of externally visible functions in subst.c. */
	2
	3	/* Copyright (C) 1993-2021 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 0x001
	36	#define Q_HERE_DOCUMENT 0x002
	37	#define Q_KEEP_BACKSLASH 0x004
	38	#define Q_PATQUOTE 0x008
	39	#define Q_QUOTED 0x010
	40	#define Q_ADDEDQUOTES 0x020
	41	#define Q_QUOTEDNULL 0x040
	42	#define Q_DOLBRACE 0x080
	43	#define Q_ARITH 0x100 /* expanding string for arithmetic evaluation */
	44	#define Q_ARRAYSUB 0x200 /* expanding indexed array subscript */
	45
	46	/* Flag values controlling how assignment statements are treated. */
	47	#define ASS_APPEND 0x0001
	48	#define ASS_MKLOCAL 0x0002
	49	#define ASS_MKASSOC 0x0004
	50	#define ASS_MKGLOBAL 0x0008 /* force global assignment */
	51	#define ASS_NAMEREF 0x0010 /* assigning to nameref variable */
	52	#define ASS_FORCE 0x0020 /* force assignment even to readonly variable */
	53	#define ASS_CHKLOCAL 0x0040 /* check local variable before assignment */
	54	#define ASS_NOEXPAND 0x0080 /* don't expand associative array subscripts */
	55	#define ASS_NOEVAL 0x0100 /* don't evaluate value as expression */
	56	#define ASS_NOLONGJMP 0x0200 /* don't longjmp on fatal assignment error */
	57	#define ASS_NOINVIS 0x0400 /* don't resolve local invisible variables */
	58	#define ASS_ALLOWALLSUB 0x0800 /* allow * and @ as associative array keys */
	59	#define ASS_ONEWORD 0x1000 /* don't check array subscripts, assume higher level has done that */
	60
	61	/* Flags for the string extraction functions. */
	62	#define SX_NOALLOC 0x0001 /* just skip; don't return substring */
	63	#define SX_VARNAME 0x0002 /* variable name; for string_extract () */
	64	#define SX_REQMATCH 0x0004 /* closing/matching delimiter required */
	65	#define SX_COMMAND 0x0008 /* extracting a shell script/command */
	66	#define SX_NOCTLESC 0x0010 /* don't honor CTLESC quoting */
	67	#define SX_NOESCCTLNUL 0x0020 /* don't let CTLESC quote CTLNUL */
	68	#define SX_NOLONGJMP 0x0040 /* don't longjmp on fatal error */
	69	#define SX_ARITHSUB 0x0080 /* extracting $(( ... )) (currently unused) */
	70	#define SX_POSIXEXP 0x0100 /* extracting new Posix pattern removal expansions in extract_dollar_brace_string */
	71	#define SX_WORD 0x0200 /* extracting word in ${param op word} */
	72	#define SX_COMPLETE 0x0400 /* extracting word for completion */
	73	#define SX_STRIPDQ 0x0800 /* strip double quotes when extracting double-quoted string */
	74	#define SX_NOERROR 0x1000 /* don't print parser error messages */
	75
	76	/* Remove backslashes which are quoting backquotes from STRING. Modifies
	77	STRING, and returns a pointer to it. */
	78	extern char * de_backslash PARAMS((char *));
	79
	80	/* Replace instances of \! in a string with !. */
	81	extern void unquote_bang PARAMS((char *));
	82
	83	/* Extract the $( construct in STRING, and return a new string.
	84	Start extracting at (SINDEX) as if we had just seen "$(".
	85	Make (SINDEX) get the position just after the matching ")".
	86	XFLAGS is additional flags to pass to other extraction functions, */
	87	extern char extract_command_subst PARAMS((char , int *, int));
	88
	89	/* Extract the $[ construct in STRING, and return a new string.
	90	Start extracting at (SINDEX) as if we had just seen "$[".
	91	Make (SINDEX) get the position just after the matching "]". */
	92	extern char extract_arithmetic_subst PARAMS((char , int *));
	93
	94	#if defined (PROCESS_SUBSTITUTION)
	95	/* Extract the <( or >( construct in STRING, and return a new string.
	96	Start extracting at (SINDEX) as if we had just seen "<(".
	97	Make (SINDEX) get the position just after the matching ")". */
	98	extern char extract_process_subst PARAMS((char , char , int , int));
	99	#endif /* PROCESS_SUBSTITUTION */
	100
	101	/* Extract the name of the variable to bind to from the assignment string. */
	102	extern char assignment_name PARAMS((char ));
	103
	104	/* Return a single string of all the words present in LIST, separating
	105	each word with SEP. */
	106	extern char string_list_internal PARAMS((WORD_LIST , char *));
	107
	108	/* Return a single string of all the words present in LIST, separating
	109	each word with a space. */
	110	extern char string_list PARAMS((WORD_LIST ));
	111
	112	/* Turn $* into a single string, obeying POSIX rules. */
	113	extern char string_list_dollar_star PARAMS((WORD_LIST , int, int));
	114
	115	/* Expand $@ into a single string, obeying POSIX rules. */
	116	extern char string_list_dollar_at PARAMS((WORD_LIST , int, int));
	117
	118	/* Turn the positional parameters into a string, understanding quoting and
	119	the various subtleties of using the first character of $IFS as the
	120	separator. Calls string_list_dollar_at, string_list_dollar_star, and
	121	string_list as appropriate. */
	122	extern char string_list_pos_params PARAMS((int, WORD_LIST , int, int));
	123
	124	/* Perform quoted null character removal on each element of LIST.
	125	This modifies LIST. */
	126	extern void word_list_remove_quoted_nulls PARAMS((WORD_LIST *));
	127
	128	/* This performs word splitting and quoted null character removal on
	129	STRING. */
	130	extern WORD_LIST list_string PARAMS((char , char *, int));
	131
	132	extern char ifs_firstchar PARAMS((int ));
	133	extern char get_word_from_string PARAMS((char , char , char **));
	134	extern char strip_trailing_ifs_whitespace PARAMS((char , char *, int));
	135
	136	/* Given STRING, an assignment string, get the value of the right side
	137	of the `=', and bind it to the left side. If EXPAND is true, then
	138	perform tilde expansion, parameter expansion, command substitution,
	139	and arithmetic expansion on the right-hand side. Do not perform word
	140	splitting on the result of expansion. */
	141	extern int do_assignment PARAMS((char *));
	142	extern int do_assignment_no_expand PARAMS((char *));
	143	extern int do_word_assignment PARAMS((WORD_DESC *, int));
	144
	145	/* Append SOURCE to TARGET at INDEX. SIZE is the current amount
	146	of space allocated to TARGET. SOURCE can be NULL, in which
	147	case nothing happens. Gets rid of SOURCE by free ()ing it.
	148	Returns TARGET in case the location has changed. */
	149	extern char sub_append_string PARAMS((char , char , size_t , size_t *));
	150
	151	/* Append the textual representation of NUMBER to TARGET.
	152	INDEX and SIZE are as in SUB_APPEND_STRING. */
	153	extern char sub_append_number PARAMS((intmax_t, char , int , int ));
	154
	155	/* Return the word list that corresponds to `$'. /
	156	extern WORD_LIST *list_rest_of_args PARAMS((void));
	157
	158	/* Make a single large string out of the dollar digit variables,
	159	and the rest_of_args. If DOLLAR_STAR is 1, then obey the special
	160	case of "$" with respect to IFS. /
	161	extern char *string_rest_of_args PARAMS((int));
	162
	163	/* Expand STRING by performing parameter expansion, command substitution,
	164	and arithmetic expansion. Dequote the resulting WORD_LIST before
	165	returning it, but do not perform word splitting. The call to
	166	remove_quoted_nulls () is made here because word splitting normally
	167	takes care of quote removal. */
	168	extern WORD_LIST expand_string_unsplit PARAMS((char , int));
	169
	170	/* Expand the rhs of an assignment statement. */
	171	extern WORD_LIST expand_string_assignment PARAMS((char , int));
	172
	173	/* Expand a prompt string. */
	174	extern WORD_LIST expand_prompt_string PARAMS((char , int, int));
	175
	176	/* Expand STRING just as if you were expanding a word. This also returns
	177	a list of words. Note that filename globbing is NOT done for word
	178	or string expansion, just when the shell is expanding a command. This
	179	does parameter expansion, command substitution, arithmetic expansion,
	180	and word splitting. Dequote the resultant WORD_LIST before returning. */
	181	extern WORD_LIST expand_string PARAMS((char , int));
	182
	183	/* Convenience functions that expand strings to strings, taking care of
	184	converting the WORD_LIST * returned by the expand_string* functions
	185	to a string and deallocating the WORD_LIST . /
	186	extern char expand_string_to_string PARAMS((char , int));
	187	extern char expand_string_unsplit_to_string PARAMS((char , int));
	188	extern char expand_assignment_string_to_string PARAMS((char , int));
	189	extern char expand_subscript_string PARAMS((char , int));
	190
	191	/* Expand an arithmetic expression string */
	192	extern char expand_arith_string PARAMS((char , int));
	193
	194	/* Expand $'...' and $"..." in a string for code paths that do not. */
	195	extern char expand_string_dollar_quote PARAMS((char , int));
	196
	197	/* De-quote quoted characters in STRING. */
	198	extern char dequote_string PARAMS((char ));
	199
	200	/* De-quote CTLESC-escaped CTLESC or CTLNUL characters in STRING. */
	201	extern char dequote_escapes PARAMS((const char ));
	202
	203	extern WORD_DESC dequote_word PARAMS((WORD_DESC ));
	204
	205	/* De-quote quoted characters in each word in LIST. */
	206	extern WORD_LIST dequote_list PARAMS((WORD_LIST ));
	207
	208	/* Expand WORD, performing word splitting on the result. This does
	209	parameter expansion, command substitution, arithmetic expansion,
	210	word splitting, and quote removal. */
	211	extern WORD_LIST expand_word PARAMS((WORD_DESC , int));
	212
	213	/* Expand WORD, but do not perform word splitting on the result. This
	214	does parameter expansion, command substitution, arithmetic expansion,
	215	and quote removal. */
	216	extern WORD_LIST expand_word_unsplit PARAMS((WORD_DESC , int));
	217	extern WORD_LIST expand_word_leave_quoted PARAMS((WORD_DESC , int));
	218
	219	/* Return the value of a positional parameter. This handles values > 10. */
	220	extern char *get_dollar_var_value PARAMS((intmax_t));
	221
	222	/* Quote a string to protect it from word splitting. */
	223	extern char quote_string PARAMS((char ));
	224
	225	/* Quote escape characters (characters special to internals of expansion)
	226	in a string. */
	227	extern char quote_escapes PARAMS((const char ));
	228
	229	/* And remove such quoted special characters. */
	230	extern char remove_quoted_escapes PARAMS((char ));
	231
	232	/* Remove CTLNUL characters from STRING unless they are quoted with CTLESC. */
	233	extern char remove_quoted_nulls PARAMS((char ));
	234
	235	/* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the
	236	backslash quoting rules for within double quotes. */
	237	extern char string_quote_removal PARAMS((char , int));
	238
	239	/* Perform quote removal on word WORD. This allocates and returns a new
	240	WORD_DESC . /
	241	extern WORD_DESC word_quote_removal PARAMS((WORD_DESC , int));
	242
	243	/* Perform quote removal on all words in LIST. If QUOTED is non-zero,
	244	the members of the list are treated as if they are surrounded by
	245	double quotes. Return a new list, or NULL if LIST is NULL. */
	246	extern WORD_LIST word_list_quote_removal PARAMS((WORD_LIST , int));
	247
	248	/* Called when IFS is changed to maintain some private variables. */
	249	extern void setifs PARAMS((SHELL_VAR *));
	250
	251	/* Return the value of $IFS, or " \t\n" if IFS is unset. */
	252	extern char *getifs PARAMS((void));
	253
	254	/* This splits a single word into a WORD LIST on $IFS, but only if the word
	255	is not quoted. list_string () performs quote removal for us, even if we
	256	don't do any splitting. */
	257	extern WORD_LIST word_split PARAMS((WORD_DESC , char *));
	258
	259	/* Take the list of words in LIST and do the various substitutions. Return
	260	a new list of words which is the expanded list, and without things like
	261	variable assignments. */
	262	extern WORD_LIST expand_words PARAMS((WORD_LIST ));
	263
	264	/* Same as expand_words (), but doesn't hack variable or environment
	265	variables. */
	266	extern WORD_LIST expand_words_no_vars PARAMS((WORD_LIST ));
	267
	268	/* Perform the `normal shell expansions' on a WORD_LIST. These are
	269	brace expansion, tilde expansion, parameter and variable substitution,
	270	command substitution, arithmetic expansion, and word splitting. */
	271	extern WORD_LIST expand_words_shellexp PARAMS((WORD_LIST ));
	272
	273	extern WORD_DESC command_substitute PARAMS((char , int, int));
	274	extern char pat_subst PARAMS((char , char , char , int));
	275
	276	#if defined (PROCESS_SUBSTITUTION)
	277	extern int fifos_pending PARAMS((void));
	278	extern int num_fifos PARAMS((void));
	279	extern void unlink_fifo_list PARAMS((void));
	280	extern void unlink_all_fifos PARAMS((void));
	281	extern void unlink_fifo PARAMS((int));
	282
	283	extern void copy_fifo_list PARAMS((int ));
	284	extern void close_new_fifos PARAMS((void *, int));
	285
	286	extern void clear_fifo_list PARAMS((void));
	287
	288	extern int find_procsub_child PARAMS((pid_t));
	289	extern void set_procsub_status PARAMS((int, pid_t, int));
	290
	291	extern void wait_procsubs PARAMS((void));
	292	extern void reap_procsubs PARAMS((void));
	293	#endif
	294
	295	extern WORD_LIST list_string_with_quotes PARAMS((char ));
	296
	297	#if defined (ARRAY_VARS)
	298	extern char extract_array_assignment_list PARAMS((char , int *));
	299	#endif
	300
	301	#if defined (COND_COMMAND)
	302	extern char remove_backslashes PARAMS((char ));
	303	extern char cond_expand_word PARAMS((WORD_DESC , int));
	304	#endif
	305
	306	/* Flags for skip_to_delim */
	307	#define SD_NOJMP 0x001 /* don't longjmp on fatal error. */
	308	#define SD_INVERT 0x002 /* look for chars NOT in passed set */
	309	#define SD_NOQUOTEDELIM 0x004 /* don't let single or double quotes act as delimiters */
	310	#define SD_NOSKIPCMD 0x008 /* don't skip over $(, <(, or >( command/process substitution; parse them as commands */
	311	#define SD_EXTGLOB 0x010 /* skip over extended globbing patterns if appropriate */
	312	#define SD_IGNOREQUOTE 0x020 /* single and double quotes are not special */
	313	#define SD_GLOB 0x040 /* skip over glob patterns like bracket expressions */
	314	#define SD_NOPROCSUB 0x080 /* don't parse process substitutions as commands */
	315	#define SD_COMPLETE 0x100 /* skip_to_delim during completion */
	316	#define SD_HISTEXP 0x200 /* skip_to_delim during history expansion */
	317	#define SD_ARITHEXP 0x400 /* skip_to_delim during arithmetic expansion */
	318	#define SD_NOERROR 0x800 /* don't print error messages */
	319
	320	extern int skip_to_delim PARAMS((char , int, char , int));
	321
	322	#if defined (BANG_HISTORY)
	323	extern int skip_to_histexp PARAMS((char , int, char , int));
	324	#endif
	325
	326	#if defined (READLINE)
	327	extern int char_is_quoted PARAMS((char *, int));
	328	extern int unclosed_pair PARAMS((char , int, char ));
	329	extern WORD_LIST split_at_delims PARAMS((char , int, const char , int, int, int , int *));
	330	#endif
	331
	332	/* Variables used to keep track of the characters in IFS. */
	333	extern SHELL_VAR *ifs_var;
	334	extern char *ifs_value;
	335	extern unsigned char ifs_cmap[];
	336	extern int ifs_is_set, ifs_is_null;
	337
	338	#if defined (HANDLE_MULTIBYTE)
	339	extern unsigned char ifs_firstc[];
	340	extern size_t ifs_firstc_len;
	341	#else
	342	extern unsigned char ifs_firstc;
	343	#endif
	344
	345	extern int assigning_in_environment;
	346	extern int expanding_redir;
	347	extern int inherit_errexit;
	348
	349	extern pid_t last_command_subst_pid;
	350
	351	/* Evaluates to 1 if C is a character in $IFS. */
	352	#define isifs(c) (ifs_cmap[(unsigned char)(c)] != 0)
	353
	354	/* How to determine the quoted state of the character C. */
	355	#define QUOTED_CHAR(c) ((c) == CTLESC)
	356
	357	/* Is the first character of STRING a quoted NULL character? */
	358	#define QUOTED_NULL(string) ((string)[0] == CTLNUL && (string)[1] == '\0')
	359
	360	extern void invalidate_cached_quoted_dollar_at PARAMS((void));
	361
	362	#endif /* !_SUBST_H_ */