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subst.c
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/* subst.c -- The part of the shell that does parameter, command, arithmetic,
and globbing substitutions. */
/* ``Have a little faith, there's magic in the night. You ain't a
beauty, but, hey, you're alright.'' */
/* Copyright (C) 1987-2016 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/>.
*/
#include "config.h"
#include "bashtypes.h"
#include <stdio.h>
#include "chartypes.h"
#if defined (HAVE_PWD_H)
# include <pwd.h>
#endif
#include <signal.h>
#include <errno.h>
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#define NEED_FPURGE_DECL
#include "bashansi.h"
#include "posixstat.h"
#include "bashintl.h"
#include "shell.h"
#include "parser.h"
#include "flags.h"
#include "jobs.h"
#include "execute_cmd.h"
#include "filecntl.h"
#include "trap.h"
#include "pathexp.h"
#include "mailcheck.h"
#include "shmbutil.h"
#if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR)
# include <mbstr.h> /* mbschr */
#endif
#include "typemax.h"
#include "builtins/getopt.h"
#include "builtins/common.h"
#include "builtins/builtext.h"
#include <tilde/tilde.h>
#include <glob/strmatch.h>
#if !defined (errno)
extern int errno;
#endif /* !errno */
/* The size that strings change by. */
#define DEFAULT_INITIAL_ARRAY_SIZE 112
#define DEFAULT_ARRAY_SIZE 128
/* Variable types. */
#define VT_VARIABLE 0
#define VT_POSPARMS 1
#define VT_ARRAYVAR 2
#define VT_ARRAYMEMBER 3
#define VT_ASSOCVAR 4
#define VT_STARSUB 128 /* $* or ${array[*]} -- used to split */
/* Flags for quoted_strchr */
#define ST_BACKSL 0x01
#define ST_CTLESC 0x02
#define ST_SQUOTE 0x04 /* unused yet */
#define ST_DQUOTE 0x08 /* unused yet */
/* These defs make it easier to use the editor. */
#define LBRACE '{'
#define RBRACE '}'
#define LPAREN '('
#define RPAREN ')'
#define LBRACK '['
#define RBRACK ']'
#if defined (HANDLE_MULTIBYTE)
#define WLPAREN L'('
#define WRPAREN L')'
#endif
#define DOLLAR_AT_STAR(c) ((c) == '@' || (c) == '*')
#define STR_DOLLAR_AT_STAR(s) (DOLLAR_AT_STAR ((s)[0]) && (s)[1] == '\0')
/* Evaluates to 1 if C is one of the shell's special parameters whose length
can be taken, but is also one of the special expansion characters. */
#define VALID_SPECIAL_LENGTH_PARAM(c) \
((c) == '-' || (c) == '?' || (c) == '#' || (c) == '@')
/* Evaluates to 1 if C is one of the shell's special parameters for which an
indirect variable reference may be made. */
#define VALID_INDIR_PARAM(c) \
((posixly_correct == 0 && (c) == '#') || (posixly_correct == 0 && (c) == '?') || (c) == '@' || (c) == '*')
/* Evaluates to 1 if C is one of the OP characters that follows the parameter
in ${parameter[:]OPword}. */
#define VALID_PARAM_EXPAND_CHAR(c) (sh_syntaxtab[(unsigned char)c] & CSUBSTOP)
/* Evaluates to 1 if this is one of the shell's special variables. */
#define SPECIAL_VAR(name, wi) \
(*name && ((DIGIT (*name) && all_digits (name)) || \
(name[1] == '\0' && (sh_syntaxtab[(unsigned char)*name] & CSPECVAR)) || \
(wi && name[2] == '\0' && VALID_INDIR_PARAM (name[1]))))
/* This can be used by all of the *_extract_* functions that have a similar
structure. It can't just be wrapped in a do...while(0) loop because of
the embedded `break'. The dangling else accommodates a trailing semicolon;
we could also put in a do ; while (0) */
#define CHECK_STRING_OVERRUN(oind, ind, len, ch) \
if (ind >= len) \
{ \
oind = len; \
ch = 0; \
break; \
} \
else \
/* An expansion function that takes a string and a quoted flag and returns
a WORD_LIST *. Used as the type of the third argument to
expand_string_if_necessary(). */
typedef WORD_LIST *EXPFUNC __P((char *, int));
/* Process ID of the last command executed within command substitution. */
pid_t last_command_subst_pid = NO_PID;
pid_t current_command_subst_pid = NO_PID;
/* Variables used to keep track of the characters in IFS. */
SHELL_VAR *ifs_var;
char *ifs_value;
unsigned char ifs_cmap[UCHAR_MAX + 1];
int ifs_is_set, ifs_is_null;
#if defined (HANDLE_MULTIBYTE)
unsigned char ifs_firstc[MB_LEN_MAX];
size_t ifs_firstc_len;
#else
unsigned char ifs_firstc;
#endif
/* If non-zero, command substitution inherits the value of errexit option */
int inherit_errexit = 0;
/* Sentinel to tell when we are performing variable assignments preceding a
command name and putting them into the environment. Used to make sure
we use the temporary environment when looking up variable values. */
int assigning_in_environment;
/* Used to hold a list of variable assignments preceding a command. Global
so the SIGCHLD handler in jobs.c can unwind-protect it when it runs a
SIGCHLD trap and so it can be saved and restored by the trap handlers. */
WORD_LIST *subst_assign_varlist = (WORD_LIST *)NULL;
/* Tell the expansion functions to not longjmp back to top_level on fatal
errors. Enabled when doing completion and prompt string expansion. */
int no_longjmp_on_fatal_error = 0;
/* Extern functions and variables from different files. */
extern int last_command_exit_value, last_command_exit_signal;
extern int subshell_environment, running_in_background;
extern int subshell_level, parse_and_execute_level, sourcelevel;
extern int eof_encountered, line_number;
extern int return_catch_flag, return_catch_value;
extern pid_t dollar_dollar_pid;
extern int posixly_correct;
extern char *this_command_name;
extern struct fd_bitmap *current_fds_to_close;
extern int wordexp_only;
extern int expanding_redir;
extern int tempenv_assign_error;
extern int builtin_ignoring_errexit;
#if defined (JOB_CONTROL) && defined (PROCESS_SUBSTITUTION)
extern PROCESS *last_procsub_child;
#endif
#if !defined (HAVE_WCSDUP) && defined (HANDLE_MULTIBYTE)
extern wchar_t *wcsdup __P((const wchar_t *));
#endif
/* Non-zero means to allow unmatched globbed filenames to expand to
a null file. */
int allow_null_glob_expansion;
/* Non-zero means to throw an error when globbing fails to match anything. */
int fail_glob_expansion;
#if 0
/* Variables to keep track of which words in an expanded word list (the
output of expand_word_list_internal) are the result of globbing
expansions. GLOB_ARGV_FLAGS is used by execute_cmd.c.
(CURRENTLY UNUSED). */
char *glob_argv_flags;
static int glob_argv_flags_size;
#endif
static WORD_LIST *cached_quoted_dollar_at = 0;
static WORD_LIST expand_word_error, expand_word_fatal;
static WORD_DESC expand_wdesc_error, expand_wdesc_fatal;
static char expand_param_error, expand_param_fatal;
static char extract_string_error, extract_string_fatal;
/* Set by expand_word_unsplit; used to inhibit splitting and re-joining
$* on $IFS, primarily when doing assignment statements. */
static int expand_no_split_dollar_star = 0;
/* A WORD_LIST of words to be expanded by expand_word_list_internal,
without any leading variable assignments. */
static WORD_LIST *garglist = (WORD_LIST *)NULL;
static char *quoted_substring __P((char *, int, int));
static int quoted_strlen __P((char *));
static char *quoted_strchr __P((char *, int, int));
static char *expand_string_if_necessary __P((char *, int, EXPFUNC *));
static inline char *expand_string_to_string_internal __P((char *, int, EXPFUNC *));
static WORD_LIST *call_expand_word_internal __P((WORD_DESC *, int, int, int *, int *));
static WORD_LIST *expand_string_internal __P((char *, int));
static WORD_LIST *expand_string_leave_quoted __P((char *, int));
static WORD_LIST *expand_string_for_rhs __P((char *, int, int *, int *));
static WORD_LIST *list_quote_escapes __P((WORD_LIST *));
static WORD_LIST *list_dequote_escapes __P((WORD_LIST *));
static char *make_quoted_char __P((int));
static WORD_LIST *quote_list __P((WORD_LIST *));
static int unquoted_substring __P((char *, char *));
static int unquoted_member __P((int, char *));
#if defined (ARRAY_VARS)
static SHELL_VAR *do_compound_assignment __P((char *, char *, int));
#endif
static int do_assignment_internal __P((const WORD_DESC *, int));
static char *string_extract_verbatim __P((char *, size_t, int *, char *, int));
static char *string_extract __P((char *, int *, char *, int));
static char *string_extract_double_quoted __P((char *, int *, int));
static inline char *string_extract_single_quoted __P((char *, int *));
static inline int skip_single_quoted __P((const char *, size_t, int, int));
static int skip_double_quoted __P((char *, size_t, int, int));
static char *extract_delimited_string __P((char *, int *, char *, char *, char *, int));
static char *extract_dollar_brace_string __P((char *, int *, int, int));
static int skip_matched_pair __P((const char *, int, int, int, int));
static char *pos_params __P((char *, int, int, int));
static unsigned char *mb_getcharlens __P((char *, int));
static char *remove_upattern __P((char *, char *, int));
#if defined (HANDLE_MULTIBYTE)
static wchar_t *remove_wpattern __P((wchar_t *, size_t, wchar_t *, int));
#endif
static char *remove_pattern __P((char *, char *, int));
static int match_upattern __P((char *, char *, int, char **, char **));
#if defined (HANDLE_MULTIBYTE)
static int match_wpattern __P((wchar_t *, char **, size_t, wchar_t *, int, char **, char **));
#endif
static int match_pattern __P((char *, char *, int, char **, char **));
static int getpatspec __P((int, char *));
static char *getpattern __P((char *, int, int));
static char *variable_remove_pattern __P((char *, char *, int, int));
static char *list_remove_pattern __P((WORD_LIST *, char *, int, int, int));
static char *parameter_list_remove_pattern __P((int, char *, int, int));
#ifdef ARRAY_VARS
static char *array_remove_pattern __P((SHELL_VAR *, char *, int, char *, int));
#endif
static char *parameter_brace_remove_pattern __P((char *, char *, int, char *, int, int, int));
static char *string_var_assignment __P((SHELL_VAR *, char *));
#if defined (ARRAY_VARS)
static char *array_var_assignment __P((SHELL_VAR *, int, int));
#endif
static char *pos_params_assignment __P((WORD_LIST *, int, int));
static char *string_transform __P((int, SHELL_VAR *, char *));
static char *list_transform __P((int, SHELL_VAR *, WORD_LIST *, int, int));
static char *parameter_list_transform __P((int, int, int));
#if defined ARRAY_VARS
static char *array_transform __P((int, SHELL_VAR *, char *, int));
#endif
static char *parameter_brace_transform __P((char *, char *, int, char *, int, int, int));
static char *process_substitute __P((char *, int));
static char *read_comsub __P((int, int, int *));
#ifdef ARRAY_VARS
static arrayind_t array_length_reference __P((char *));
#endif
static int valid_brace_expansion_word __P((char *, int));
static int chk_atstar __P((char *, int, int *, int *));
static int chk_arithsub __P((const char *, int));
static WORD_DESC *parameter_brace_expand_word __P((char *, int, int, int, arrayind_t *));
static char *parameter_brace_find_indir __P((char *, int, int, int));
static WORD_DESC *parameter_brace_expand_indir __P((char *, int, int, int *, int *));
static WORD_DESC *parameter_brace_expand_rhs __P((char *, char *, int, int, int, int *, int *));
static void parameter_brace_expand_error __P((char *, char *));
static int valid_length_expression __P((char *));
static intmax_t parameter_brace_expand_length __P((char *));
static char *skiparith __P((char *, int));
static int verify_substring_values __P((SHELL_VAR *, char *, char *, int, intmax_t *, intmax_t *));
static int get_var_and_type __P((char *, char *, arrayind_t, int, int, SHELL_VAR **, char **));
static char *mb_substring __P((char *, int, int));
static char *parameter_brace_substring __P((char *, char *, int, char *, int, int));
static int shouldexp_replacement __P((char *));
static char *pos_params_pat_subst __P((char *, char *, char *, int));
static char *parameter_brace_patsub __P((char *, char *, int, char *, int, int, int));
static char *pos_params_casemod __P((char *, char *, int, int));
static char *parameter_brace_casemod __P((char *, char *, int, int, char *, int, int));
static WORD_DESC *parameter_brace_expand __P((char *, int *, int, int, int *, int *));
static WORD_DESC *param_expand __P((char *, int *, int, int *, int *, int *, int *, int));
static WORD_LIST *expand_word_internal __P((WORD_DESC *, int, int, int *, int *));
static WORD_LIST *word_list_split __P((WORD_LIST *));
static void exp_jump_to_top_level __P((int));
static WORD_LIST *separate_out_assignments __P((WORD_LIST *));
static WORD_LIST *glob_expand_word_list __P((WORD_LIST *, int));
#ifdef BRACE_EXPANSION
static WORD_LIST *brace_expand_word_list __P((WORD_LIST *, int));
#endif
#if defined (ARRAY_VARS)
static int make_internal_declare __P((char *, char *, char *));
#endif
static WORD_LIST *shell_expand_word_list __P((WORD_LIST *, int));
static WORD_LIST *expand_word_list_internal __P((WORD_LIST *, int));
/* **************************************************************** */
/* */
/* Utility Functions */
/* */
/* **************************************************************** */
#if defined (DEBUG)
void
dump_word_flags (flags)
int flags;
{
int f;
f = flags;
fprintf (stderr, "%d -> ", f);
if (f & W_ARRAYIND)
{
f &= ~W_ARRAYIND;
fprintf (stderr, "W_ARRAYIND%s", f ? "|" : "");
}
if (f & W_ASSIGNASSOC)
{
f &= ~W_ASSIGNASSOC;
fprintf (stderr, "W_ASSIGNASSOC%s", f ? "|" : "");
}
if (f & W_ASSIGNARRAY)
{
f &= ~W_ASSIGNARRAY;
fprintf (stderr, "W_ASSIGNARRAY%s", f ? "|" : "");
}
if (f & W_HASCTLESC)
{
f &= ~W_HASCTLESC;
fprintf (stderr, "W_HASCTLESC%s", f ? "|" : "");
}
if (f & W_NOPROCSUB)
{
f &= ~W_NOPROCSUB;
fprintf (stderr, "W_NOPROCSUB%s", f ? "|" : "");
}
if (f & W_DQUOTE)
{
f &= ~W_DQUOTE;
fprintf (stderr, "W_DQUOTE%s", f ? "|" : "");
}
if (f & W_HASQUOTEDNULL)
{
f &= ~W_HASQUOTEDNULL;
fprintf (stderr, "W_HASQUOTEDNULL%s", f ? "|" : "");
}
if (f & W_ASSIGNARG)
{
f &= ~W_ASSIGNARG;
fprintf (stderr, "W_ASSIGNARG%s", f ? "|" : "");
}
if (f & W_ASSNBLTIN)
{
f &= ~W_ASSNBLTIN;
fprintf (stderr, "W_ASSNBLTIN%s", f ? "|" : "");
}
if (f & W_ASSNGLOBAL)
{
f &= ~W_ASSNGLOBAL;
fprintf (stderr, "W_ASSNGLOBAL%s", f ? "|" : "");
}
if (f & W_COMPASSIGN)
{
f &= ~W_COMPASSIGN;
fprintf (stderr, "W_COMPASSIGN%s", f ? "|" : "");
}
if (f & W_NOEXPAND)
{
f &= ~W_NOEXPAND;
fprintf (stderr, "W_NOEXPAND%s", f ? "|" : "");
}
if (f & W_ITILDE)
{
f &= ~W_ITILDE;
fprintf (stderr, "W_ITILDE%s", f ? "|" : "");
}
if (f & W_NOTILDE)
{
f &= ~W_NOTILDE;
fprintf (stderr, "W_NOTILDE%s", f ? "|" : "");
}
if (f & W_ASSIGNRHS)
{
f &= ~W_ASSIGNRHS;
fprintf (stderr, "W_ASSIGNRHS%s", f ? "|" : "");
}
if (f & W_NOCOMSUB)
{
f &= ~W_NOCOMSUB;
fprintf (stderr, "W_NOCOMSUB%s", f ? "|" : "");
}
if (f & W_DOLLARSTAR)
{
f &= ~W_DOLLARSTAR;
fprintf (stderr, "W_DOLLARSTAR%s", f ? "|" : "");
}
if (f & W_DOLLARAT)
{
f &= ~W_DOLLARAT;
fprintf (stderr, "W_DOLLARAT%s", f ? "|" : "");
}
if (f & W_TILDEEXP)
{
f &= ~W_TILDEEXP;
fprintf (stderr, "W_TILDEEXP%s", f ? "|" : "");
}
if (f & W_NOSPLIT2)
{
f &= ~W_NOSPLIT2;
fprintf (stderr, "W_NOSPLIT2%s", f ? "|" : "");
}
if (f & W_NOSPLIT)
{
f &= ~W_NOSPLIT;
fprintf (stderr, "W_NOSPLIT%s", f ? "|" : "");
}
if (f & W_NOBRACE)
{
f &= ~W_NOBRACE;
fprintf (stderr, "W_NOBRACE%s", f ? "|" : "");
}
if (f & W_NOGLOB)
{
f &= ~W_NOGLOB;
fprintf (stderr, "W_NOGLOB%s", f ? "|" : "");
}
if (f & W_SPLITSPACE)
{
f &= ~W_SPLITSPACE;
fprintf (stderr, "W_SPLITSPACE%s", f ? "|" : "");
}
if (f & W_ASSIGNMENT)
{
f &= ~W_ASSIGNMENT;
fprintf (stderr, "W_ASSIGNMENT%s", f ? "|" : "");
}
if (f & W_QUOTED)
{
f &= ~W_QUOTED;
fprintf (stderr, "W_QUOTED%s", f ? "|" : "");
}
if (f & W_HASDOLLAR)
{
f &= ~W_HASDOLLAR;
fprintf (stderr, "W_HASDOLLAR%s", f ? "|" : "");
}
if (f & W_COMPLETE)
{
f &= ~W_COMPLETE;
fprintf (stderr, "W_COMPLETE%s", f ? "|" : "");
}
fprintf (stderr, "\n");
fflush (stderr);
}
#endif
#ifdef INCLUDE_UNUSED
static char *
quoted_substring (string, start, end)
char *string;
int start, end;
{
register int len, l;
register char *result, *s, *r;
len = end - start;
/* Move to string[start], skipping quoted characters. */
for (s = string, l = 0; *s && l < start; )
{
if (*s == CTLESC)
{
s++;
continue;
}
l++;
if (*s == 0)
break;
}
r = result = (char *)xmalloc (2*len + 1); /* save room for quotes */
/* Copy LEN characters, including quote characters. */
s = string + l;
for (l = 0; l < len; s++)
{
if (*s == CTLESC)
*r++ = *s++;
*r++ = *s;
l++;
if (*s == 0)
break;
}
*r = '\0';
return result;
}
#endif
#ifdef INCLUDE_UNUSED
/* Return the length of S, skipping over quoted characters */
static int
quoted_strlen (s)
char *s;
{
register char *p;
int i;
i = 0;
for (p = s; *p; p++)
{
if (*p == CTLESC)
{
p++;
if (*p == 0)
return (i + 1);
}
i++;
}
return i;
}
#endif
/* Find the first occurrence of character C in string S, obeying shell
quoting rules. If (FLAGS & ST_BACKSL) is non-zero, backslash-escaped
characters are skipped. If (FLAGS & ST_CTLESC) is non-zero, characters
escaped with CTLESC are skipped. */
static char *
quoted_strchr (s, c, flags)
char *s;
int c, flags;
{
register char *p;
for (p = s; *p; p++)
{
if (((flags & ST_BACKSL) && *p == '\\')
|| ((flags & ST_CTLESC) && *p == CTLESC))
{
p++;
if (*p == '\0')
return ((char *)NULL);
continue;
}
else if (*p == c)
return p;
}
return ((char *)NULL);
}
#if defined (INCLUDE_UNUSED)
/* Return 1 if CHARACTER appears in an unquoted portion of
STRING. Return 0 otherwise. CHARACTER must be a single-byte character. */
static int
unquoted_member (character, string)
int character;
char *string;
{
size_t slen;
int sindex, c;
DECLARE_MBSTATE;
slen = strlen (string);
sindex = 0;
while (c = string[sindex])
{
if (c == character)
return (1);
switch (c)
{
default:
ADVANCE_CHAR (string, slen, sindex);
break;
case '\\':
sindex++;
if (string[sindex])
ADVANCE_CHAR (string, slen, sindex);
break;
case '\'':
sindex = skip_single_quoted (string, slen, ++sindex, 0);
break;
case '"':
sindex = skip_double_quoted (string, slen, ++sindex, 0);
break;
}
}
return (0);
}
/* Return 1 if SUBSTR appears in an unquoted portion of STRING. */
static int
unquoted_substring (substr, string)
char *substr, *string;
{
size_t slen;
int sindex, c, sublen;
DECLARE_MBSTATE;
if (substr == 0 || *substr == '\0')
return (0);
slen = strlen (string);
sublen = strlen (substr);
for (sindex = 0; c = string[sindex]; )
{
if (STREQN (string + sindex, substr, sublen))
return (1);
switch (c)
{
case '\\':
sindex++;
if (string[sindex])
ADVANCE_CHAR (string, slen, sindex);
break;
case '\'':
sindex = skip_single_quoted (string, slen, ++sindex, 0);
break;
case '"':
sindex = skip_double_quoted (string, slen, ++sindex, 0);
break;
default:
ADVANCE_CHAR (string, slen, sindex);
break;
}
}
return (0);
}
#endif
/* Most of the substitutions must be done in parallel. In order
to avoid using tons of unclear goto's, I have some functions
for manipulating malloc'ed strings. They all take INDX, a
pointer to an integer which is the offset into the string
where manipulation is taking place. They also take SIZE, a
pointer to an integer which is the current length of the
character array for this string. */
/* 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 freeing it.
Returns TARGET in case the location has changed. */
INLINE char *
sub_append_string (source, target, indx, size)
char *source, *target;
int *indx;
size_t *size;
{
if (source)
{
int n;
size_t srclen;
srclen = STRLEN (source);
if (srclen >= (int)(*size - *indx))
{
n = srclen + *indx;
n = (n + DEFAULT_ARRAY_SIZE) - (n % DEFAULT_ARRAY_SIZE);
target = (char *)xrealloc (target, (*size = n));
}
FASTCOPY (source, target + *indx, srclen);
*indx += srclen;
target[*indx] = '\0';
free (source);
}
return (target);
}
#if 0
/* UNUSED */
/* Append the textual representation of NUMBER to TARGET.
INDX and SIZE are as in SUB_APPEND_STRING. */
char *
sub_append_number (number, target, indx, size)
intmax_t number;
char *target;
int *indx;
size_t *size;
{
char *temp;
temp = itos (number);
return (sub_append_string (temp, target, indx, size));
}
#endif
/* Extract a substring from STRING, starting at SINDEX and ending with
one of the characters in CHARLIST. Don't make the ending character
part of the string. Leave SINDEX pointing at the ending character.
Understand about backslashes in the string. If (flags & SX_VARNAME)
is non-zero, and array variables have been compiled into the shell,
everything between a `[' and a corresponding `]' is skipped over.
If (flags & SX_NOALLOC) is non-zero, don't return the substring, just
update SINDEX. If (flags & SX_REQMATCH) is non-zero, the string must
contain a closing character from CHARLIST. */
static char *
string_extract (string, sindex, charlist, flags)
char *string;
int *sindex;
char *charlist;
int flags;
{
register int c, i;
int found;
size_t slen;
char *temp;
DECLARE_MBSTATE;
slen = (MB_CUR_MAX > 1) ? strlen (string + *sindex) + *sindex : 0;
i = *sindex;
found = 0;
while (c = string[i])
{
if (c == '\\')
{
if (string[i + 1])
i++;
else
break;
}
#if defined (ARRAY_VARS)
else if ((flags & SX_VARNAME) && c == '[')
{
int ni;
/* If this is an array subscript, skip over it and continue. */
ni = skipsubscript (string, i, 0);
if (string[ni] == ']')
i = ni;
}
#endif
else if (MEMBER (c, charlist))
{
found = 1;
break;
}
ADVANCE_CHAR (string, slen, i);
}
/* If we had to have a matching delimiter and didn't find one, return an
error and let the caller deal with it. */
if ((flags & SX_REQMATCH) && found == 0)
{
*sindex = i;
return (&extract_string_error);
}
temp = (flags & SX_NOALLOC) ? (char *)NULL : substring (string, *sindex, i);
*sindex = i;
return (temp);
}
/* Extract the contents of STRING as if it is enclosed in double quotes.
SINDEX, when passed in, is the offset of the character immediately
following the opening double quote; on exit, SINDEX is left pointing after
the closing double quote. If STRIPDQ is non-zero, unquoted double
quotes are stripped and the string is terminated by a null byte.
Backslashes between the embedded double quotes are processed. If STRIPDQ
is zero, an unquoted `"' terminates the string. */
static char *
string_extract_double_quoted (string, sindex, flags)
char *string;
int *sindex, flags;
{
size_t slen;
char *send;
int j, i, t;
unsigned char c;
char *temp, *ret; /* The new string we return. */
int pass_next, backquote, si; /* State variables for the machine. */
int dquote;
int stripdq;
DECLARE_MBSTATE;
slen = strlen (string + *sindex) + *sindex;
send = string + slen;
stripdq = (flags & SX_STRIPDQ);
pass_next = backquote = dquote = 0;
temp = (char *)xmalloc (1 + slen - *sindex);
j = 0;
i = *sindex;
while (c = string[i])
{
/* Process a character that was quoted by a backslash. */
if (pass_next)
{
/* XXX - take another look at this in light of Interp 221 */
/* Posix.2 sez:
``The backslash shall retain its special meaning as an escape
character only when followed by one of the characters:
$ ` " \ <newline>''.
If STRIPDQ is zero, we handle the double quotes here and let
expand_word_internal handle the rest. If STRIPDQ is non-zero,
we have already been through one round of backslash stripping,
and want to strip these backslashes only if DQUOTE is non-zero,
indicating that we are inside an embedded double-quoted string. */
/* If we are in an embedded quoted string, then don't strip
backslashes before characters for which the backslash
retains its special meaning, but remove backslashes in
front of other characters. If we are not in an
embedded quoted string, don't strip backslashes at all.
This mess is necessary because the string was already
surrounded by double quotes (and sh has some really weird
quoting rules).
The returned string will be run through expansion as if
it were double-quoted. */
if ((stripdq == 0 && c != '"') ||
(stripdq && ((dquote && (sh_syntaxtab[c] & CBSDQUOTE)) || dquote == 0)))
temp[j++] = '\\';
pass_next = 0;
add_one_character:
COPY_CHAR_I (temp, j, string, send, i);
continue;
}
/* A backslash protects the next character. The code just above
handles preserving the backslash in front of any character but
a double quote. */
if (c == '\\')
{
pass_next++;
i++;
continue;
}
/* Inside backquotes, ``the portion of the quoted string from the
initial backquote and the characters up to the next backquote
that is not preceded by a backslash, having escape characters
removed, defines that command''. */
if (backquote)
{
if (c == '`')
backquote = 0;
temp[j++] = c;
i++;
continue;
}
if (c == '`')
{
temp[j++] = c;
backquote++;
i++;
continue;
}
/* Pass everything between `$(' and the matching `)' or a quoted
${ ... } pair through according to the Posix.2 specification. */
if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE)))
{
int free_ret = 1;
si = i + 2;
if (string[i + 1] == LPAREN)
ret = extract_command_subst (string, &si, (flags & SX_COMPLETE));
else
ret = extract_dollar_brace_string (string, &si, Q_DOUBLE_QUOTES, 0);
temp[j++] = '$';
temp[j++] = string[i + 1];
/* Just paranoia; ret will not be 0 unless no_longjmp_on_fatal_error
is set. */
if (ret == 0 && no_longjmp_on_fatal_error)
{
free_ret = 0;
ret = string + i + 2;
}
for (t = 0; ret[t]; t++, j++)
temp[j] = ret[t];
temp[j] = string[si];
if (string[si])
{
j++;
i = si + 1;
}
else
i = si;
if (free_ret)
free (ret);
continue;
}
/* Add any character but a double quote to the quoted string we're
accumulating. */
if (c != '"')
goto add_one_character;
/* c == '"' */
if (stripdq)
{
dquote ^= 1;
i++;
continue;
}
break;
}
temp[j] = '\0';
/* Point to after the closing quote. */
if (c)
i++;
*sindex = i;
return (temp);
}
/* This should really be another option to string_extract_double_quoted. */
static int