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Diffstat (limited to 'arrayfunc.c')
| -rw-r--r-- | arrayfunc.c | 1496 |
1 files changed, 1496 insertions, 0 deletions
diff --git a/arrayfunc.c b/arrayfunc.c new file mode 100644 index 0000000..2f8a384 --- /dev/null +++ b/arrayfunc.c @@ -0,0 +1,1496 @@ +/* arrayfunc.c -- High-level array functions used by other parts of the shell. */ + +/* Copyright (C) 2001-2020 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" + +#if defined (ARRAY_VARS) + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif +#include <stdio.h> + +#include "bashintl.h" + +#include "shell.h" +#include "execute_cmd.h" +#include "pathexp.h" + +#include "shmbutil.h" +#if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR) +# include <mbstr.h> /* mbschr */ +#endif + +#include "builtins/common.h" + +#ifndef LBRACK +# define LBRACK '[' +# define RBRACK ']' +#endif + +/* This variable means to not expand associative array subscripts more than + once, when performing variable expansion. */ +int assoc_expand_once = 0; + +/* Ditto for indexed array subscripts -- currently unused */ +int array_expand_once = 0; + +static SHELL_VAR *bind_array_var_internal PARAMS((SHELL_VAR *, arrayind_t, char *, char *, int)); +static SHELL_VAR *assign_array_element_internal PARAMS((SHELL_VAR *, char *, char *, char *, int, char *, int)); + +static void assign_assoc_from_kvlist PARAMS((SHELL_VAR *, WORD_LIST *, HASH_TABLE *, int)); + +static char *quote_assign PARAMS((const char *)); +static void quote_array_assignment_chars PARAMS((WORD_LIST *)); +static char *quote_compound_array_word PARAMS((char *, int)); +static char *array_value_internal PARAMS((const char *, int, int, int *, arrayind_t *)); + +/* Standard error message to use when encountering an invalid array subscript */ +const char * const bash_badsub_errmsg = N_("bad array subscript"); + +/* **************************************************************** */ +/* */ +/* Functions to manipulate array variables and perform assignments */ +/* */ +/* **************************************************************** */ + +/* Convert a shell variable to an array variable. The original value is + saved as array[0]. */ +SHELL_VAR * +convert_var_to_array (var) + SHELL_VAR *var; +{ + char *oldval; + ARRAY *array; + + oldval = value_cell (var); + array = array_create (); + if (oldval) + array_insert (array, 0, oldval); + + FREE (value_cell (var)); + var_setarray (var, array); + + /* these aren't valid anymore */ + var->dynamic_value = (sh_var_value_func_t *)NULL; + var->assign_func = (sh_var_assign_func_t *)NULL; + + INVALIDATE_EXPORTSTR (var); + if (exported_p (var)) + array_needs_making++; + + VSETATTR (var, att_array); + if (oldval) + VUNSETATTR (var, att_invisible); + + /* Make sure it's not marked as an associative array any more */ + VUNSETATTR (var, att_assoc); + + /* Since namerefs can't be array variables, turn off nameref attribute */ + VUNSETATTR (var, att_nameref); + + return var; +} + +/* Convert a shell variable to an array variable. The original value is + saved as array[0]. */ +SHELL_VAR * +convert_var_to_assoc (var) + SHELL_VAR *var; +{ + char *oldval; + HASH_TABLE *hash; + + oldval = value_cell (var); + hash = assoc_create (0); + if (oldval) + assoc_insert (hash, savestring ("0"), oldval); + + FREE (value_cell (var)); + var_setassoc (var, hash); + + /* these aren't valid anymore */ + var->dynamic_value = (sh_var_value_func_t *)NULL; + var->assign_func = (sh_var_assign_func_t *)NULL; + + INVALIDATE_EXPORTSTR (var); + if (exported_p (var)) + array_needs_making++; + + VSETATTR (var, att_assoc); + if (oldval) + VUNSETATTR (var, att_invisible); + + /* Make sure it's not marked as an indexed array any more */ + VUNSETATTR (var, att_array); + + /* Since namerefs can't be array variables, turn off nameref attribute */ + VUNSETATTR (var, att_nameref); + + return var; +} + +char * +make_array_variable_value (entry, ind, key, value, flags) + SHELL_VAR *entry; + arrayind_t ind; + char *key; + char *value; + int flags; +{ + SHELL_VAR *dentry; + char *newval; + + /* If we're appending, we need the old value of the array reference, so + fake out make_variable_value with a dummy SHELL_VAR */ + if (flags & ASS_APPEND) + { + dentry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); + dentry->name = savestring (entry->name); + if (assoc_p (entry)) + newval = assoc_reference (assoc_cell (entry), key); + else + newval = array_reference (array_cell (entry), ind); + if (newval) + dentry->value = savestring (newval); + else + { + dentry->value = (char *)xmalloc (1); + dentry->value[0] = '\0'; + } + dentry->exportstr = 0; + dentry->attributes = entry->attributes & ~(att_array|att_assoc|att_exported); + /* Leave the rest of the members uninitialized; the code doesn't look + at them. */ + newval = make_variable_value (dentry, value, flags); + dispose_variable (dentry); + } + else + newval = make_variable_value (entry, value, flags); + + return newval; +} + +/* Assign HASH[KEY]=VALUE according to FLAGS. ENTRY is an associative array + variable; HASH is the hash table to assign into. HASH may or may not be + the hash table associated with ENTRY; if it's not, the caller takes care + of it. + XXX - make sure that any dynamic associative array variables recreate the + hash table on each assignment. BASH_CMDS and BASH_ALIASES already do this */ +static SHELL_VAR * +bind_assoc_var_internal (entry, hash, key, value, flags) + SHELL_VAR *entry; + HASH_TABLE *hash; + char *key; + char *value; + int flags; +{ + char *newval; + + /* Use the existing array contents to expand the value */ + newval = make_array_variable_value (entry, 0, key, value, flags); + + if (entry->assign_func) + (*entry->assign_func) (entry, newval, 0, key); + else + assoc_insert (hash, key, newval); + + FREE (newval); + + VUNSETATTR (entry, att_invisible); /* no longer invisible */ + + /* check mark_modified_variables if we ever want to export array vars */ + return (entry); +} + +/* Perform ENTRY[IND]=VALUE or ENTRY[KEY]=VALUE. This is not called for every + assignment to an associative array; see assign_compound_array_list below. */ +static SHELL_VAR * +bind_array_var_internal (entry, ind, key, value, flags) + SHELL_VAR *entry; + arrayind_t ind; + char *key; + char *value; + int flags; +{ + char *newval; + + newval = make_array_variable_value (entry, ind, key, value, flags); + + if (entry->assign_func) + (*entry->assign_func) (entry, newval, ind, key); + else if (assoc_p (entry)) + assoc_insert (assoc_cell (entry), key, newval); + else + array_insert (array_cell (entry), ind, newval); + FREE (newval); + + VUNSETATTR (entry, att_invisible); /* no longer invisible */ + + /* check mark_modified_variables if we ever want to export array vars */ + return (entry); +} + +/* Perform an array assignment name[ind]=value. If NAME already exists and + is not an array, and IND is 0, perform name=value instead. If NAME exists + and is not an array, and IND is not 0, convert it into an array with the + existing value as name[0]. + + If NAME does not exist, just create an array variable, no matter what + IND's value may be. */ +SHELL_VAR * +bind_array_variable (name, ind, value, flags) + char *name; + arrayind_t ind; + char *value; + int flags; +{ + SHELL_VAR *entry; + + entry = find_shell_variable (name); + + if (entry == (SHELL_VAR *) 0) + { + /* Is NAME a nameref variable that points to an unset variable? */ + entry = find_variable_nameref_for_create (name, 0); + if (entry == INVALID_NAMEREF_VALUE) + return ((SHELL_VAR *)0); + if (entry && nameref_p (entry)) + entry = make_new_array_variable (nameref_cell (entry)); + } + if (entry == (SHELL_VAR *) 0) + entry = make_new_array_variable (name); + else if ((readonly_p (entry) && (flags&ASS_FORCE) == 0) || noassign_p (entry)) + { + if (readonly_p (entry)) + err_readonly (name); + return (entry); + } + else if (array_p (entry) == 0) + entry = convert_var_to_array (entry); + + /* ENTRY is an array variable, and ARRAY points to the value. */ + return (bind_array_var_internal (entry, ind, 0, value, flags)); +} + +SHELL_VAR * +bind_array_element (entry, ind, value, flags) + SHELL_VAR *entry; + arrayind_t ind; + char *value; + int flags; +{ + return (bind_array_var_internal (entry, ind, 0, value, flags)); +} + +SHELL_VAR * +bind_assoc_variable (entry, name, key, value, flags) + SHELL_VAR *entry; + char *name; + char *key; + char *value; + int flags; +{ + if ((readonly_p (entry) && (flags&ASS_FORCE) == 0) || noassign_p (entry)) + { + if (readonly_p (entry)) + err_readonly (name); + return (entry); + } + + return (bind_assoc_var_internal (entry, assoc_cell (entry), key, value, flags)); +} + +/* Parse NAME, a lhs of an assignment statement of the form v[s], and + assign VALUE to that array element by calling bind_array_variable(). + Flags are ASS_ assignment flags */ +SHELL_VAR * +assign_array_element (name, value, flags) + char *name, *value; + int flags; +{ + char *sub, *vname; + int sublen, isassoc; + SHELL_VAR *entry; + + vname = array_variable_name (name, (flags & ASS_NOEXPAND) != 0, &sub, &sublen); + + if (vname == 0) + return ((SHELL_VAR *)NULL); + + entry = find_variable (vname); + isassoc = entry && assoc_p (entry); + + if (((isassoc == 0 || (flags & ASS_NOEXPAND) == 0) && (ALL_ELEMENT_SUB (sub[0]) && sub[1] == ']')) || (sublen <= 1)) + { + free (vname); + err_badarraysub (name); + return ((SHELL_VAR *)NULL); + } + + entry = assign_array_element_internal (entry, name, vname, sub, sublen, value, flags); + + free (vname); + return entry; +} + +static SHELL_VAR * +assign_array_element_internal (entry, name, vname, sub, sublen, value, flags) + SHELL_VAR *entry; + char *name; /* only used for error messages */ + char *vname; + char *sub; + int sublen; + char *value; + int flags; +{ + char *akey; + arrayind_t ind; + + if (entry && assoc_p (entry)) + { + sub[sublen-1] = '\0'; + if ((flags & ASS_NOEXPAND) == 0) + akey = expand_assignment_string_to_string (sub, 0); /* [ */ + else + akey = savestring (sub); + sub[sublen-1] = ']'; + if (akey == 0 || *akey == 0) + { + err_badarraysub (name); + FREE (akey); + return ((SHELL_VAR *)NULL); + } + entry = bind_assoc_variable (entry, vname, akey, value, flags); + } + else + { + ind = array_expand_index (entry, sub, sublen, 0); + /* negative subscripts to indexed arrays count back from end */ + if (entry && ind < 0) + ind = (array_p (entry) ? array_max_index (array_cell (entry)) : 0) + 1 + ind; + if (ind < 0) + { + err_badarraysub (name); + return ((SHELL_VAR *)NULL); + } + entry = bind_array_variable (vname, ind, value, flags); + } + + return (entry); +} + +/* Find the array variable corresponding to NAME. If there is no variable, + create a new array variable. If the variable exists but is not an array, + convert it to an indexed array. If FLAGS&1 is non-zero, an existing + variable is checked for the readonly or noassign attribute in preparation + for assignment (e.g., by the `read' builtin). If FLAGS&2 is non-zero, we + create an associative array. */ +SHELL_VAR * +find_or_make_array_variable (name, flags) + char *name; + int flags; +{ + SHELL_VAR *var; + + var = find_variable (name); + if (var == 0) + { + /* See if we have a nameref pointing to a variable that hasn't been + created yet. */ + var = find_variable_last_nameref (name, 1); + if (var && nameref_p (var) && invisible_p (var)) + { + internal_warning (_("%s: removing nameref attribute"), name); + VUNSETATTR (var, att_nameref); + } + if (var && nameref_p (var)) + { + if (valid_nameref_value (nameref_cell (var), 2) == 0) + { + sh_invalidid (nameref_cell (var)); + return ((SHELL_VAR *)NULL); + } + var = (flags & 2) ? make_new_assoc_variable (nameref_cell (var)) : make_new_array_variable (nameref_cell (var)); + } + } + + if (var == 0) + var = (flags & 2) ? make_new_assoc_variable (name) : make_new_array_variable (name); + else if ((flags & 1) && (readonly_p (var) || noassign_p (var))) + { + if (readonly_p (var)) + err_readonly (name); + return ((SHELL_VAR *)NULL); + } + else if ((flags & 2) && array_p (var)) + { + set_exit_status (EXECUTION_FAILURE); + report_error (_("%s: cannot convert indexed to associative array"), name); + return ((SHELL_VAR *)NULL); + } + else if (array_p (var) == 0 && assoc_p (var) == 0) + var = convert_var_to_array (var); + + return (var); +} + +/* Perform a compound assignment statement for array NAME, where VALUE is + the text between the parens: NAME=( VALUE ) */ +SHELL_VAR * +assign_array_from_string (name, value, flags) + char *name, *value; + int flags; +{ + SHELL_VAR *var; + int vflags; + + vflags = 1; + if (flags & ASS_MKASSOC) + vflags |= 2; + + var = find_or_make_array_variable (name, vflags); + if (var == 0) + return ((SHELL_VAR *)NULL); + + return (assign_array_var_from_string (var, value, flags)); +} + +/* Sequentially assign the indices of indexed array variable VAR from the + words in LIST. */ +SHELL_VAR * +assign_array_var_from_word_list (var, list, flags) + SHELL_VAR *var; + WORD_LIST *list; + int flags; +{ + register arrayind_t i; + register WORD_LIST *l; + ARRAY *a; + + a = array_cell (var); + i = (flags & ASS_APPEND) ? array_max_index (a) + 1 : 0; + + for (l = list; l; l = l->next, i++) + bind_array_var_internal (var, i, 0, l->word->word, flags & ~ASS_APPEND); + + VUNSETATTR (var, att_invisible); /* no longer invisible */ + + return var; +} + +WORD_LIST * +expand_compound_array_assignment (var, value, flags) + SHELL_VAR *var; + char *value; + int flags; +{ + WORD_LIST *list, *nlist; + char *val; + int ni; + + /* This condition is true when invoked from the declare builtin with a + command like + declare -a d='([1]="" [2]="bdef" [5]="hello world" "test")' */ + if (*value == '(') /*)*/ + { + ni = 1; + val = extract_array_assignment_list (value, &ni); + if (val == 0) + return (WORD_LIST *)NULL; + } + else + val = value; + + /* Expand the value string into a list of words, performing all the + shell expansions including pathname generation and word splitting. */ + /* First we split the string on whitespace, using the shell parser + (ksh93 seems to do this). */ + list = parse_string_to_word_list (val, 1, "array assign"); + + /* Note that we defer expansion of the assignment statements for associative + arrays here, so we don't have to scan the subscript and find the ending + bracket twice. See the caller below. */ + if (var && assoc_p (var)) + { + if (val != value) + free (val); + return list; + } + + /* If we're using [subscript]=value, we need to quote each [ and ] to + prevent unwanted filename expansion. This doesn't need to be done + for associative array expansion, since that uses a different expansion + function (see assign_compound_array_list below). */ + if (list) + quote_array_assignment_chars (list); + + /* Now that we've split it, perform the shell expansions on each + word in the list. */ + nlist = list ? expand_words_no_vars (list) : (WORD_LIST *)NULL; + + dispose_words (list); + + if (val != value) + free (val); + + return nlist; +} + +#if ASSOC_KVPAIR_ASSIGNMENT +static void +assign_assoc_from_kvlist (var, nlist, h, flags) + SHELL_VAR *var; + WORD_LIST *nlist; + HASH_TABLE *h; + int flags; +{ + WORD_LIST *list; + char *akey, *aval, *k, *v; + int free_aval; + + for (list = nlist; list; list = list->next) + { + free_aval = 0; + + k = list->word->word; + v = list->next ? list->next->word->word : 0; + + if (list->next) + list = list->next; + + akey = expand_assignment_string_to_string (k, 0); + aval = expand_assignment_string_to_string (v, 0); + + if (akey == 0 || *akey == 0) + { + err_badarraysub (k); + FREE (akey); + continue; + } + if (aval == 0) + { + aval = (char *)xmalloc (1); + aval[0] = '\0'; /* like do_assignment_internal */ + free_aval = 1; + } + + bind_assoc_var_internal (var, h, akey, aval, flags); + if (free_aval) + free (aval); + } +} +#endif + +/* Callers ensure that VAR is not NULL. Associative array assignments have not + been expanded when this is called, or have been expanded once and single- + quoted, so we don't have to scan through an unquoted expanded subscript to + find the ending bracket; indexed array assignments have been expanded and + possibly single-quoted to prevent further expansion. + + If this is an associative array, we perform the assignments into NHASH and + set NHASH to be the value of VAR after processing the assignments in NLIST */ +void +assign_compound_array_list (var, nlist, flags) + SHELL_VAR *var; + WORD_LIST *nlist; + int flags; +{ + ARRAY *a; + HASH_TABLE *h, *nhash; + WORD_LIST *list; + char *w, *val, *nval, *savecmd; + int len, iflags, free_val; + arrayind_t ind, last_ind; + char *akey; + + a = (var && array_p (var)) ? array_cell (var) : (ARRAY *)0; + nhash = h = (var && assoc_p (var)) ? assoc_cell (var) : (HASH_TABLE *)0; + + akey = (char *)0; + ind = 0; + + /* Now that we are ready to assign values to the array, kill the existing + value. */ + if ((flags & ASS_APPEND) == 0) + { + if (a && array_p (var)) + array_flush (a); + else if (h && assoc_p (var)) + nhash = assoc_create (h->nbuckets); + } + + last_ind = (a && (flags & ASS_APPEND)) ? array_max_index (a) + 1 : 0; + +#if ASSOC_KVPAIR_ASSIGNMENT + if (assoc_p (var) && nlist && (nlist->word->flags & W_ASSIGNMENT) == 0 && nlist->word->word[0] != '[') /*]*/ + { + iflags = flags & ~ASS_APPEND; + assign_assoc_from_kvlist (var, nlist, nhash, iflags); + if (nhash && nhash != h) + { + h = assoc_cell (var); + var_setassoc (var, nhash); + assoc_dispose (h); + } + return; + } +#endif + + for (list = nlist; list; list = list->next) + { + /* Don't allow var+=(values) to make assignments in VALUES append to + existing values by default. */ + iflags = flags & ~ASS_APPEND; + w = list->word->word; + + /* We have a word of the form [ind]=value */ + if ((list->word->flags & W_ASSIGNMENT) && w[0] == '[') + { + /* Don't have to handle embedded quotes specially any more, since + associative array subscripts have not been expanded yet (see + above). */ + len = skipsubscript (w, 0, 0); + + /* XXX - changes for `+=' */ + if (w[len] != ']' || (w[len+1] != '=' && (w[len+1] != '+' || w[len+2] != '='))) + { + if (assoc_p (var)) + { + err_badarraysub (w); + continue; + } + nval = make_variable_value (var, w, flags); + if (var->assign_func) + (*var->assign_func) (var, nval, last_ind, 0); + else + array_insert (a, last_ind, nval); + FREE (nval); + last_ind++; + continue; + } + + if (len == 1) + { + err_badarraysub (w); + continue; + } + + if (ALL_ELEMENT_SUB (w[1]) && len == 2) + { + set_exit_status (EXECUTION_FAILURE); + if (assoc_p (var)) + report_error (_("%s: invalid associative array key"), w); + else + report_error (_("%s: cannot assign to non-numeric index"), w); + continue; + } + + if (array_p (var)) + { + ind = array_expand_index (var, w + 1, len, 0); + /* negative subscripts to indexed arrays count back from end */ + if (ind < 0) + ind = array_max_index (array_cell (var)) + 1 + ind; + if (ind < 0) + { + err_badarraysub (w); + continue; + } + + last_ind = ind; + } + else if (assoc_p (var)) + { + /* This is not performed above, see expand_compound_array_assignment */ + w[len] = '\0'; /*[*/ + akey = expand_assignment_string_to_string (w+1, 0); + w[len] = ']'; + /* And we need to expand the value also, see below */ + if (akey == 0 || *akey == 0) + { + err_badarraysub (w); + FREE (akey); + continue; + } + } + + /* XXX - changes for `+=' -- just accept the syntax. ksh93 doesn't do this */ + if (w[len + 1] == '+' && w[len + 2] == '=') + { + iflags |= ASS_APPEND; + val = w + len + 3; + } + else + val = w + len + 2; + } + else if (assoc_p (var)) + { + set_exit_status (EXECUTION_FAILURE); + report_error (_("%s: %s: must use subscript when assigning associative array"), var->name, w); + continue; + } + else /* No [ind]=value, just a stray `=' */ + { + ind = last_ind; + val = w; + } + + free_val = 0; + /* See above; we need to expand the value here */ + if (assoc_p (var)) + { + val = expand_assignment_string_to_string (val, 0); + if (val == 0) + { + val = (char *)xmalloc (1); + val[0] = '\0'; /* like do_assignment_internal */ + } + free_val = 1; + } + + savecmd = this_command_name; + if (integer_p (var)) + this_command_name = (char *)NULL; /* no command name for errors */ + if (assoc_p (var)) + bind_assoc_var_internal (var, nhash, akey, val, iflags); + else + bind_array_var_internal (var, ind, akey, val, iflags); + last_ind++; + this_command_name = savecmd; + + if (free_val) + free (val); + } + + if (assoc_p (var) && nhash && nhash != h) + { + h = assoc_cell (var); + var_setassoc (var, nhash); + assoc_dispose (h); + } +} + +/* Perform a compound array assignment: VAR->name=( VALUE ). The + VALUE has already had the parentheses stripped. */ +SHELL_VAR * +assign_array_var_from_string (var, value, flags) + SHELL_VAR *var; + char *value; + int flags; +{ + WORD_LIST *nlist; + + if (value == 0) + return var; + + nlist = expand_compound_array_assignment (var, value, flags); + assign_compound_array_list (var, nlist, flags); + + if (nlist) + dispose_words (nlist); + + if (var) + VUNSETATTR (var, att_invisible); /* no longer invisible */ + + return (var); +} + +/* Quote globbing chars and characters in $IFS before the `=' in an assignment + statement (usually a compound array assignment) to protect them from + unwanted filename expansion or word splitting. */ +static char * +quote_assign (string) + const char *string; +{ + size_t slen; + int saw_eq; + char *temp, *t, *subs; + const char *s, *send; + int ss, se; + DECLARE_MBSTATE; + + slen = strlen (string); + send = string + slen; + + t = temp = (char *)xmalloc (slen * 2 + 1); + saw_eq = 0; + for (s = string; *s; ) + { + if (*s == '=') + saw_eq = 1; + if (saw_eq == 0 && *s == '[') /* looks like a subscript */ + { + ss = s - string; + se = skipsubscript (string, ss, 0); + subs = substring (s, ss, se); + *t++ = '\\'; + strcpy (t, subs); + t += se - ss; + *t++ = '\\'; + *t++ = ']'; + s += se + 1; + free (subs); + continue; + } + if (saw_eq == 0 && (glob_char_p (s) || isifs (*s))) + *t++ = '\\'; + + COPY_CHAR_P (t, s, send); + } + *t = '\0'; + return temp; +} + +/* Take a word W of the form [IND]=VALUE and transform it to ['IND']='VALUE' + to prevent further expansion. This is called for compound assignments to + indexed arrays. W has already undergone word expansions. If W has no [IND]=, + just single-quote and return it. */ +static char * +quote_compound_array_word (w, type) + char *w; + int type; +{ + char *nword, *sub, *value, *t; + int ind, wlen, i; + + if (w[0] != LBRACK) + return (sh_single_quote (w)); + ind = skipsubscript (w, 0, 0); + if (w[ind] != RBRACK) + return (sh_single_quote (w)); + + wlen = strlen (w); + w[ind] = '\0'; + sub = sh_single_quote (w+1); + w[ind] = RBRACK; + + nword = xmalloc (wlen * 4 + 5); /* wlen*4 is max single quoted length */ + nword[0] = LBRACK; + i = STRLEN (sub); + memcpy (nword+1, sub, i); + i++; /* accommodate the opening LBRACK */ + nword[i++] = w[ind++]; /* RBRACK */ + if (w[ind] == '+') + nword[i++] = w[ind++]; + nword[i++] = w[ind++]; + value = sh_single_quote (w + ind); + strcpy (nword + i, value); + + return nword; +} + +/* Expand the key and value in W, which is of the form [KEY]=VALUE, and + reconstruct W with the expanded and single-quoted version: + ['expanded-key']='expanded-value'. If there is no [KEY]=, single-quote the + word and return it. Very similar to previous function, but does not assume + W has already been expanded, and expands the KEY and VALUE separately. + Used for compound assignments to associative arrays that are arguments to + declaration builtins (declare -A a=( list )). */ +char * +expand_and_quote_assoc_word (w, type) + char *w; + int type; +{ + char *nword, *key, *value, *t; + int ind, wlen, i; + + if (w[0] != LBRACK) + return (sh_single_quote (w)); + ind = skipsubscript (w, 0, 0); + if (w[ind] != RBRACK) + return (sh_single_quote (w)); + + w[ind] = '\0'; + t = expand_assignment_string_to_string (w+1, 0); + w[ind] = RBRACK; + key = sh_single_quote (t ? t : ""); + free (t); + + wlen = STRLEN (key); + nword = xmalloc (wlen + 5); + nword[0] = LBRACK; + memcpy (nword+1, key, wlen); + i = wlen + 1; /* accommodate the opening LBRACK */ + + nword[i++] = w[ind++]; /* RBRACK */ + if (w[ind] == '+') + nword[i++] = w[ind++]; + nword[i++] = w[ind++]; + + t = expand_assignment_string_to_string (w+ind, 0); + value = sh_single_quote (t ? t : ""); + free (t); + nword = xrealloc (nword, wlen + 5 + STRLEN (value)); + strcpy (nword + i, value); + + free (key); + free (value); + + return nword; +} + +/* For each word in a compound array assignment, if the word looks like + [ind]=value, single-quote ind and value, but leave the brackets and + the = sign (and any `+') alone. If it's not an assignment, just single- + quote the word. This is used for indexed arrays. */ +void +quote_compound_array_list (list, type) + WORD_LIST *list; + int type; +{ + char *t; + WORD_LIST *l; + + for (l = list; l; l = l->next) + { + if (l->word == 0 || l->word->word == 0) + continue; /* should not happen, but just in case... */ + if ((l->word->flags & W_ASSIGNMENT) == 0) + t = sh_single_quote (l->word->word); + else + t = quote_compound_array_word (l->word->word, type); + free (l->word->word); + l->word->word = t; + } +} + +/* For each word in a compound array assignment, if the word looks like + [ind]=value, quote globbing chars and characters in $IFS before the `='. */ +static void +quote_array_assignment_chars (list) + WORD_LIST *list; +{ + char *nword; + WORD_LIST *l; + + for (l = list; l; l = l->next) + { + if (l->word == 0 || l->word->word == 0 || l->word->word[0] == '\0') + continue; /* should not happen, but just in case... */ + /* Don't bother if it hasn't been recognized as an assignment or + doesn't look like [ind]=value */ + if ((l->word->flags & W_ASSIGNMENT) == 0) + continue; + if (l->word->word[0] != '[' || mbschr (l->word->word, '=') == 0) /* ] */ + continue; + + nword = quote_assign (l->word->word); + free (l->word->word); + l->word->word = nword; + l->word->flags |= W_NOGLOB; /* XXX - W_NOSPLIT also? */ + } +} + +/* skipsubscript moved to subst.c to use private functions. 2009/02/24. */ + +/* This function is called with SUB pointing to just after the beginning + `[' of an array subscript and removes the array element to which SUB + expands from array VAR. A subscript of `*' or `@' unsets the array. */ +/* If FLAGS&1 we don't expand the subscript; we just use it as-is. */ +int +unbind_array_element (var, sub, flags) + SHELL_VAR *var; + char *sub; + int flags; +{ + int len; + arrayind_t ind; + char *akey; + ARRAY_ELEMENT *ae; + + len = skipsubscript (sub, 0, (flags&1) || (var && assoc_p(var))); /* XXX */ + if (sub[len] != ']' || len == 0) + { + builtin_error ("%s[%s: %s", var->name, sub, _(bash_badsub_errmsg)); + return -1; + } + sub[len] = '\0'; + + if (ALL_ELEMENT_SUB (sub[0]) && sub[1] == 0) + { + if (array_p (var) || assoc_p (var)) + { + unbind_variable (var->name); /* XXX -- {array,assoc}_flush ? */ + return (0); + } + else + return -2; /* don't allow this to unset scalar variables */ + } + + if (assoc_p (var)) + { + akey = (flags & 1) ? sub : expand_assignment_string_to_string (sub, 0); + if (akey == 0 || *akey == 0) + { + builtin_error ("[%s]: %s", sub, _(bash_badsub_errmsg)); + FREE (akey); + return -1; + } + assoc_remove (assoc_cell (var), akey); + if (akey != sub) + free (akey); + } + else if (array_p (var)) + { + ind = array_expand_index (var, sub, len+1, 0); + /* negative subscripts to indexed arrays count back from end */ + if (ind < 0) + ind = array_max_index (array_cell (var)) + 1 + ind; + if (ind < 0) + { + builtin_error ("[%s]: %s", sub, _(bash_badsub_errmsg)); + return -1; + } + ae = array_remove (array_cell (var), ind); + if (ae) + array_dispose_element (ae); + } + else /* array_p (var) == 0 && assoc_p (var) == 0 */ + { + akey = this_command_name; + ind = array_expand_index (var, sub, len+1, 0); + this_command_name = akey; + if (ind == 0) + { + unbind_variable (var->name); + return (0); + } + else + return -2; /* any subscript other than 0 is invalid with scalar variables */ + } + + return 0; +} + +/* Format and output an array assignment in compound form VAR=(VALUES), + suitable for re-use as input. */ +void +print_array_assignment (var, quoted) + SHELL_VAR *var; + int quoted; +{ + char *vstr; + + vstr = array_to_assign (array_cell (var), quoted); + + if (vstr == 0) + printf ("%s=%s\n", var->name, quoted ? "'()'" : "()"); + else + { + printf ("%s=%s\n", var->name, vstr); + free (vstr); + } +} + +/* Format and output an associative array assignment in compound form + VAR=(VALUES), suitable for re-use as input. */ +void +print_assoc_assignment (var, quoted) + SHELL_VAR *var; + int quoted; +{ + char *vstr; + + vstr = assoc_to_assign (assoc_cell (var), quoted); + + if (vstr == 0) + printf ("%s=%s\n", var->name, quoted ? "'()'" : "()"); + else + { + printf ("%s=%s\n", var->name, vstr); + free (vstr); + } +} + +/***********************************************************************/ +/* */ +/* Utility functions to manage arrays and their contents for expansion */ +/* */ +/***********************************************************************/ + +/* Return 1 if NAME is a properly-formed array reference v[sub]. */ + +/* We need to reserve 1 for FLAGS, which we pass to skipsubscript. */ +int +valid_array_reference (name, flags) + const char *name; + int flags; +{ + char *t; + int r, len, isassoc; + SHELL_VAR *entry; + + t = mbschr (name, '['); /* ] */ + isassoc = 0; + if (t) + { + *t = '\0'; + r = legal_identifier (name); + if (flags & VA_NOEXPAND) /* Don't waste a lookup if we don't need one */ + isassoc = (entry = find_variable (name)) && assoc_p (entry); + *t = '['; + if (r == 0) + return 0; + + if (isassoc && ((flags & (VA_NOEXPAND|VA_ONEWORD)) == (VA_NOEXPAND|VA_ONEWORD))) + len = strlen (t) - 1; + else if (isassoc) + len = skipsubscript (t, 0, flags&VA_NOEXPAND); /* VA_NOEXPAND must be 1 */ + else + /* Check for a properly-terminated non-null subscript. */ + len = skipsubscript (t, 0, 0); /* arithmetic expression */ + + if (t[len] != ']' || len == 1 || t[len+1] != '\0') + return 0; + +#if 0 + /* Could check and allow subscripts consisting only of whitespace for + existing associative arrays, using isassoc */ + for (r = 1; r < len; r++) + if (whitespace (t[r]) == 0) + return 1; + return 0; +#else + /* This allows blank subscripts */ + return 1; +#endif + } + return 0; +} + +/* Expand the array index beginning at S and extending LEN characters. */ +arrayind_t +array_expand_index (var, s, len, flags) + SHELL_VAR *var; + char *s; + int len; + int flags; +{ + char *exp, *t, *savecmd; + int expok; + arrayind_t val; + + exp = (char *)xmalloc (len); + strncpy (exp, s, len - 1); + exp[len - 1] = '\0'; +#if 0 /* TAG: maybe bash-5.2 */ + if ((flags & AV_NOEXPAND) == 0) + t = expand_arith_string (exp, Q_DOUBLE_QUOTES|Q_ARITH|Q_ARRAYSUB); /* XXX - Q_ARRAYSUB for future use */ + else + t = exp; +#endif + t = expand_arith_string (exp, Q_DOUBLE_QUOTES|Q_ARITH|Q_ARRAYSUB); /* XXX - Q_ARRAYSUB for future use */ + savecmd = this_command_name; + this_command_name = (char *)NULL; + val = evalexp (t, EXP_EXPANDED, &expok); /* XXX - was 0 but we expanded exp already */ + this_command_name = savecmd; + if (t != exp) + free (t); + free (exp); + if (expok == 0) + { + set_exit_status (EXECUTION_FAILURE); + + if (no_longjmp_on_fatal_error) + return 0; + top_level_cleanup (); + jump_to_top_level (DISCARD); + } + return val; +} + +/* Return the name of the variable specified by S without any subscript. + If SUBP is non-null, return a pointer to the start of the subscript + in *SUBP. If LENP is non-null, the length of the subscript is returned + in *LENP. This returns newly-allocated memory. */ +char * +array_variable_name (s, flags, subp, lenp) + const char *s; + int flags; + char **subp; + int *lenp; +{ + char *t, *ret; + int ind, ni; + + t = mbschr (s, '['); + if (t == 0) + { + if (subp) + *subp = t; + if (lenp) + *lenp = 0; + return ((char *)NULL); + } + ind = t - s; + ni = skipsubscript (s, ind, flags); /* XXX - was 0 not flags */ + if (ni <= ind + 1 || s[ni] != ']') + { + err_badarraysub (s); + if (subp) + *subp = t; + if (lenp) + *lenp = 0; + return ((char *)NULL); + } + + *t = '\0'; + ret = savestring (s); + *t++ = '['; /* ] */ + + if (subp) + *subp = t; + if (lenp) + *lenp = ni - ind; + + return ret; +} + +/* Return the variable specified by S without any subscript. If SUBP is + non-null, return a pointer to the start of the subscript in *SUBP. + If LENP is non-null, the length of the subscript is returned in *LENP. */ +SHELL_VAR * +array_variable_part (s, flags, subp, lenp) + const char *s; + int flags; + char **subp; + int *lenp; +{ + char *t; + SHELL_VAR *var; + + t = array_variable_name (s, flags, subp, lenp); + if (t == 0) + return ((SHELL_VAR *)NULL); + var = find_variable (t); /* XXX - handle namerefs here? */ + + free (t); + return var; /* now return invisible variables; caller must handle */ +} + +#define INDEX_ERROR() \ + do \ + { \ + if (var) \ + err_badarraysub (var->name); \ + else \ + { \ + t[-1] = '\0'; \ + err_badarraysub (s); \ + t[-1] = '['; /* ] */\ + } \ + return ((char *)NULL); \ + } \ + while (0) + +/* Return a string containing the elements in the array and subscript + described by S. If the subscript is * or @, obeys quoting rules akin + to the expansion of $* and $@ including double quoting. If RTYPE + is non-null it gets 1 if the array reference is name[*], 2 if the + reference is name[@], and 0 otherwise. */ +static char * +array_value_internal (s, quoted, flags, rtype, indp) + const char *s; + int quoted, flags, *rtype; + arrayind_t *indp; +{ + int len; + arrayind_t ind; + char *akey; + char *retval, *t, *temp; + WORD_LIST *l; + SHELL_VAR *var; + + var = array_variable_part (s, (flags&AV_NOEXPAND) ? 1 : 0, &t, &len); /* XXX */ + + /* Expand the index, even if the variable doesn't exist, in case side + effects are needed, like ${w[i++]} where w is unset. */ +#if 0 + if (var == 0) + return (char *)NULL; +#endif + + if (len == 0) + return ((char *)NULL); /* error message already printed */ + + /* [ */ + akey = 0; + if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') + { + if (rtype) + *rtype = (t[0] == '*') ? 1 : 2; + if ((flags & AV_ALLOWALL) == 0) + { + err_badarraysub (s); + return ((char *)NULL); + } + else if (var == 0 || value_cell (var) == 0) /* XXX - check for invisible_p(var) ? */ + return ((char *)NULL); + else if (invisible_p (var)) + return ((char *)NULL); + else if (array_p (var) == 0 && assoc_p (var) == 0) + l = add_string_to_list (value_cell (var), (WORD_LIST *)NULL); + else if (assoc_p (var)) + { + l = assoc_to_word_list (assoc_cell (var)); + if (l == (WORD_LIST *)NULL) + return ((char *)NULL); + } + else + { + l = array_to_word_list (array_cell (var)); + if (l == (WORD_LIST *)NULL) + return ((char *) NULL); + } + + /* Caller of array_value takes care of inspecting rtype and duplicating + retval if rtype == 0, so this is not a memory leak */ + if (t[0] == '*' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) + { + temp = string_list_dollar_star (l, quoted, (flags & AV_ASSIGNRHS) ? PF_ASSIGNRHS : 0); + retval = quote_string (temp); + free (temp); + } + else /* ${name[@]} or unquoted ${name[*]} */ + retval = string_list_dollar_at (l, quoted, (flags & AV_ASSIGNRHS) ? PF_ASSIGNRHS : 0); + + dispose_words (l); + } + else + { + if (rtype) + *rtype = 0; + if (var == 0 || array_p (var) || assoc_p (var) == 0) + { + if ((flags & AV_USEIND) == 0 || indp == 0) + { + ind = array_expand_index (var, t, len, flags); + if (ind < 0) + { + /* negative subscripts to indexed arrays count back from end */ + if (var && array_p (var)) + ind = array_max_index (array_cell (var)) + 1 + ind; + if (ind < 0) + INDEX_ERROR(); + } + if (indp) + *indp = ind; + } + else if (indp) + ind = *indp; + } + else if (assoc_p (var)) + { + t[len - 1] = '\0'; + if ((flags & AV_NOEXPAND) == 0) + akey = expand_assignment_string_to_string (t, 0); /* [ */ + else + akey = savestring (t); + t[len - 1] = ']'; + if (akey == 0 || *akey == 0) + { + FREE (akey); + INDEX_ERROR(); + } + } + + if (var == 0 || value_cell (var) == 0) /* XXX - check invisible_p(var) ? */ + { + FREE (akey); + return ((char *)NULL); + } + else if (invisible_p (var)) + { + FREE (akey); + return ((char *)NULL); + } + if (array_p (var) == 0 && assoc_p (var) == 0) + return (ind == 0 ? value_cell (var) : (char *)NULL); + else if (assoc_p (var)) + { + retval = assoc_reference (assoc_cell (var), akey); + free (akey); + } + else + retval = array_reference (array_cell (var), ind); + } + + return retval; +} + +/* Return a string containing the elements described by the array and + subscript contained in S, obeying quoting for subscripts * and @. */ +char * +array_value (s, quoted, flags, rtype, indp) + const char *s; + int quoted, flags, *rtype; + arrayind_t *indp; +{ + return (array_value_internal (s, quoted, flags|AV_ALLOWALL, rtype, indp)); +} + +/* Return the value of the array indexing expression S as a single string. + If (FLAGS & AV_ALLOWALL) is 0, do not allow `@' and `*' subscripts. This + is used by other parts of the shell such as the arithmetic expression + evaluator in expr.c. */ +char * +get_array_value (s, flags, rtype, indp) + const char *s; + int flags, *rtype; + arrayind_t *indp; +{ + return (array_value_internal (s, 0, flags, rtype, indp)); +} + +char * +array_keys (s, quoted, pflags) + char *s; + int quoted, pflags; +{ + int len; + char *retval, *t, *temp; + WORD_LIST *l; + SHELL_VAR *var; + + var = array_variable_part (s, 0, &t, &len); + + /* [ */ + if (var == 0 || ALL_ELEMENT_SUB (t[0]) == 0 || t[1] != ']') + return (char *)NULL; + + if (var_isset (var) == 0 || invisible_p (var)) + return (char *)NULL; + + if (array_p (var) == 0 && assoc_p (var) == 0) + l = add_string_to_list ("0", (WORD_LIST *)NULL); + else if (assoc_p (var)) + l = assoc_keys_to_word_list (assoc_cell (var)); + else + l = array_keys_to_word_list (array_cell (var)); + if (l == (WORD_LIST *)NULL) + return ((char *) NULL); + + retval = string_list_pos_params (t[0], l, quoted, pflags); + + dispose_words (l); + return retval; +} +#endif /* ARRAY_VARS */ |