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diff --git a/builtins/declare.def b/builtins/declare.def new file mode 100644 index 0000000..7eac6f5 --- /dev/null +++ b/builtins/declare.def @@ -0,0 +1,1000 @@ +This file is declare.def, from which is created declare.c. +It implements the builtins "declare" and "local" in Bash. + +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/>. + +$PRODUCES declare.c + +$BUILTIN declare +$FUNCTION declare_builtin +$SHORT_DOC declare [-aAfFgilnrtux] [-p] [name[=value] ...] +Set variable values and attributes. + +Declare variables and give them attributes. If no NAMEs are given, +display the attributes and values of all variables. + +Options: + -f restrict action or display to function names and definitions + -F restrict display to function names only (plus line number and + source file when debugging) + -g create global variables when used in a shell function; otherwise + ignored + -p display the attributes and value of each NAME + +Options which set attributes: + -a to make NAMEs indexed arrays (if supported) + -A to make NAMEs associative arrays (if supported) + -i to make NAMEs have the `integer' attribute + -l to convert the value of each NAME to lower case on assignment + -n make NAME a reference to the variable named by its value + -r to make NAMEs readonly + -t to make NAMEs have the `trace' attribute + -u to convert the value of each NAME to upper case on assignment + -x to make NAMEs export + +Using `+' instead of `-' turns off the given attribute. + +Variables with the integer attribute have arithmetic evaluation (see +the `let' command) performed when the variable is assigned a value. + +When used in a function, `declare' makes NAMEs local, as with the `local' +command. The `-g' option suppresses this behavior. + +Exit Status: +Returns success unless an invalid option is supplied or a variable +assignment error occurs. +$END + +$BUILTIN typeset +$FUNCTION declare_builtin +$SHORT_DOC typeset [-aAfFgilnrtux] [-p] name[=value] ... +Set variable values and attributes. + +A synonym for `declare'. See `help declare'. +$END + +#include <config.h> + +#if defined (HAVE_UNISTD_H) +# ifdef _MINIX +# include <sys/types.h> +# endif +# include <unistd.h> +#endif + +#include <stdio.h> + +#include "../bashansi.h" +#include "../bashintl.h" + +#include "../shell.h" +#include "../flags.h" +#include "common.h" +#include "builtext.h" +#include "bashgetopt.h" + +static SHELL_VAR *declare_find_variable __P((const char *, int, int)); +static int declare_internal __P((register WORD_LIST *, int)); + +/* Declare or change variable attributes. */ +int +declare_builtin (list) + register WORD_LIST *list; +{ + return (declare_internal (list, 0)); +} + +$BUILTIN local +$FUNCTION local_builtin +$SHORT_DOC local [option] name[=value] ... +Define local variables. + +Create a local variable called NAME, and give it VALUE. OPTION can +be any option accepted by `declare'. + +Local variables can only be used within a function; they are visible +only to the function where they are defined and its children. + +Exit Status: +Returns success unless an invalid option is supplied, a variable +assignment error occurs, or the shell is not executing a function. +$END +int +local_builtin (list) + register WORD_LIST *list; +{ + /* Catch a straight `local --help' before checking function context */ + if (list && list->word && STREQ (list->word->word, "--help")) + { + builtin_help (); + return (EX_USAGE); + } + + if (variable_context) + return (declare_internal (list, 1)); + else + { + builtin_error (_("can only be used in a function")); + return (EXECUTION_FAILURE); + } +} + +#if defined (ARRAY_VARS) +# define DECLARE_OPTS "+acfgilnprtuxAFG" +#else +# define DECLARE_OPTS "+cfgilnprtuxFG" +#endif + +static SHELL_VAR * +declare_find_variable (name, mkglobal, chklocal) + const char *name; + int mkglobal, chklocal; +{ + SHELL_VAR *var; + + if (mkglobal == 0) + return (find_variable (name)); + else if (chklocal) + { + var = find_variable (name); + if (var && local_p (var) && var->context == variable_context) + return var; + return (find_global_variable (name)); + } + else + return (find_global_variable (name)); +} + +/* The workhorse function. */ +static int +declare_internal (list, local_var) + register WORD_LIST *list; + int local_var; +{ + int flags_on, flags_off, *flags; + int any_failed, assign_error, pflag, nodefs, opt, onref, offref; + int mkglobal, chklocal; + char *t, *subscript_start; + SHELL_VAR *var, *refvar, *v; + FUNCTION_DEF *shell_fn; + + flags_on = flags_off = any_failed = assign_error = pflag = nodefs = 0; + mkglobal = chklocal = 0; + refvar = (SHELL_VAR *)NULL; + reset_internal_getopt (); + while ((opt = internal_getopt (list, DECLARE_OPTS)) != -1) + { + flags = list_opttype == '+' ? &flags_off : &flags_on; + + /* If you add options here, see whether or not they need to be added to + the loop in subst.c:shell_expand_word_list() */ + switch (opt) + { + case 'a': +#if defined (ARRAY_VARS) + *flags |= att_array; + break; +#else + builtin_usage (); + return (EX_USAGE); +#endif + case 'A': +#if defined (ARRAY_VARS) + *flags |= att_assoc; + break; +#else + builtin_usage (); + return (EX_USAGE); +#endif + case 'p': + if (local_var == 0) + pflag++; + break; + case 'F': + nodefs++; + *flags |= att_function; + break; + case 'f': + *flags |= att_function; + break; + case 'G': + if (flags == &flags_on) + chklocal = 1; + /*FALLTHROUGH*/ + case 'g': + if (flags == &flags_on) + mkglobal = 1; + break; + case 'i': + *flags |= att_integer; + break; + case 'n': + *flags |= att_nameref; + break; + case 'r': + *flags |= att_readonly; + break; + case 't': + *flags |= att_trace; + break; + case 'x': + *flags |= att_exported; + array_needs_making = 1; + break; +#if defined (CASEMOD_ATTRS) +# if defined (CASEMOD_CAPCASE) + case 'c': + *flags |= att_capcase; + if (flags == &flags_on) + flags_off |= att_uppercase|att_lowercase; + break; +# endif + case 'l': + *flags |= att_lowercase; + if (flags == &flags_on) + flags_off |= att_capcase|att_uppercase; + break; + case 'u': + *flags |= att_uppercase; + if (flags == &flags_on) + flags_off |= att_capcase|att_lowercase; + break; +#endif /* CASEMOD_ATTRS */ + CASE_HELPOPT; + default: + builtin_usage (); + return (EX_USAGE); + } + } + + list = loptend; + + /* If there are no more arguments left, then we just want to show + some variables. */ + if (list == 0) /* declare -[aAfFirtx] */ + { + /* Show local variables defined at this context level if this is + the `local' builtin. */ + if (local_var) + { + register SHELL_VAR **vlist; + register int i; + + vlist = all_local_variables (); + + if (vlist) + { + for (i = 0; vlist[i]; i++) + print_assignment (vlist[i]); + + free (vlist); + } + } + else if (pflag && (flags_on == 0 || flags_on == att_function)) + show_all_var_attributes (flags_on == 0, nodefs); + else if (flags_on == 0) + return (set_builtin ((WORD_LIST *)NULL)); + else + set_or_show_attributes ((WORD_LIST *)NULL, flags_on, nodefs); + + return (sh_chkwrite (EXECUTION_SUCCESS)); + } + + if (pflag) /* declare -p [-aAfFirtx] name [name...] */ + { + for (any_failed = 0; list; list = list->next) + { + if (flags_on & att_function) + pflag = show_func_attributes (list->word->word, nodefs); + else + pflag = show_name_attributes (list->word->word, nodefs); + if (pflag) + { + sh_notfound (list->word->word); + any_failed++; + } + } + return (sh_chkwrite (any_failed ? EXECUTION_FAILURE : EXECUTION_SUCCESS)); + } + +#define NEXT_VARIABLE() free (name); list = list->next; continue + + /* There are arguments left, so we are making variables. */ + while (list) /* declare [-aAfFirx] name [name ...] */ + { + char *value, *name, *oldname; + int offset, aflags, wflags, created_var, namelen; + int assoc_noexpand; +#if defined (ARRAY_VARS) + int making_array_special, compound_array_assign, simple_array_assign; + int var_exists, array_exists, creating_array, array_subscript_assignment; +#endif + + name = savestring (list->word->word); + wflags = list->word->flags; +#if defined (ARRAY_VARS) + assoc_noexpand = assoc_expand_once && (wflags & W_ASSIGNMENT); +#else + assoc_noexpand = 0; +#endif + offset = assignment (name, assoc_noexpand ? 2 : 0); + aflags = 0; + created_var = 0; + + if (local_var && variable_context && STREQ (name, "-")) + { + var = make_local_variable ("-", 0); + FREE (value_cell (var)); /* just in case */ + value = get_current_options (); + var_setvalue (var, value); + VSETATTR (var, att_invisible); + NEXT_VARIABLE (); + } + + if (offset) /* declare [-aAfFirx] name=value */ + { + name[offset] = '\0'; + value = name + offset + 1; + if (name[offset - 1] == '+') + { + aflags |= ASS_APPEND; + name[offset - 1] = '\0'; + } + } + else + value = ""; + + /* Do some lexical error checking on the LHS and RHS of the assignment + that is specific to nameref variables. */ + if (flags_on & att_nameref) + { +#if defined (ARRAY_VARS) + if (valid_array_reference (name, 0)) + { + builtin_error (_("%s: reference variable cannot be an array"), name); + assign_error++; + NEXT_VARIABLE (); + } + else +#endif + /* disallow self references at global scope, warn at function scope */ + if (check_selfref (name, value, 0)) + { + if (variable_context == 0) + { + builtin_error (_("%s: nameref variable self references not allowed"), name); + assign_error++; + NEXT_VARIABLE (); + } + else + builtin_warning (_("%s: circular name reference"), name); + } +#if 1 + if (value && *value && (aflags & ASS_APPEND) == 0 && valid_nameref_value (value, 1) == 0) + { + builtin_error (_("`%s': invalid variable name for name reference"), value); + assign_error++; + NEXT_VARIABLE (); + } +#endif + } + +restart_new_var_name: +#if defined (ARRAY_VARS) + var_exists = array_exists = creating_array = 0; + compound_array_assign = simple_array_assign = 0; + array_subscript_assignment = 0; + subscript_start = (char *)NULL; + if ((t = strchr (name, '[')) && (flags_on & att_function) == 0) /* ] */ + { + /* If offset != 0 we have already validated any array reference + because assignment() calls skipsubscript() */ + if (offset == 0 && valid_array_reference (name, 0) == 0) + { + sh_invalidid (name); + assign_error++; + NEXT_VARIABLE (); + } + subscript_start = t; + *t = '\0'; + making_array_special = 1; /* XXX - should this check offset? */ + array_subscript_assignment = offset != 0; + } + else + making_array_special = 0; +#endif + + /* If we're in posix mode or not looking for a shell function (since + shell function names don't have to be valid identifiers when the + shell's not in posix mode), check whether or not the argument is a + valid, well-formed shell identifier. */ + if ((posixly_correct || (flags_on & att_function) == 0) && legal_identifier (name) == 0) + { + sh_invalidid (name); + assign_error++; + NEXT_VARIABLE (); + } + + /* If VARIABLE_CONTEXT has a non-zero value, then we are executing + inside of a function. This means we should make local variables, + not global ones. */ + + /* XXX - this has consequences when we're making a local copy of a + variable that was in the temporary environment. Watch out + for this. */ + refvar = (SHELL_VAR *)NULL; + if (variable_context && mkglobal == 0 && ((flags_on & att_function) == 0)) + { + char *newname; + + /* check name for validity here? */ + var = find_variable (name); + if (var == 0) + newname = nameref_transform_name (name, ASS_MKLOCAL); + else if ((flags_on & att_nameref) == 0 && (flags_off & att_nameref) == 0) + { + /* Ok, we're following namerefs here, so let's make sure that if + we followed one, it was at the same context (see below for + more details). */ + refvar = find_variable_last_nameref (name, 1); + newname = (refvar && refvar->context != variable_context) ? name : var->name; + refvar = (SHELL_VAR *)NULL; + } + else + newname = name; /* dealing with nameref attribute */ + +#if defined (ARRAY_VARS) + /* Pass 1 as second argument to make_local_{assoc,array}_variable + return an existing {array,assoc} variable to be flagged as an + error below. */ + if (flags_on & att_assoc) + var = make_local_assoc_variable (newname, 1); + else if ((flags_on & att_array) || making_array_special) + var = make_local_array_variable (newname, 1); + else +#endif + if (offset == 0 && (flags_on & att_nameref)) + { + /* First look for refvar at current scope */ + refvar = find_variable_last_nameref (name, 1); + /* VARIABLE_CONTEXT != 0, so we are attempting to create or modify + the attributes for a local variable at the same scope. If we've + used a reference from a previous context to resolve VAR, we + want to throw REFVAR and VAR away and create a new local var. */ + if (refvar && refvar->context != variable_context) + { + refvar = 0; + var = make_local_variable (name, 0); + } + else if (refvar && refvar->context == variable_context) + var = refvar; + /* Maybe we just want to create a new local variable */ + else if (var == 0 || var->context != variable_context) + var = make_local_variable (name, 0); + /* otherwise we have a var at the right context */ + } + else + /* XXX - check name for validity here with valid_nameref_value */ + var = make_local_variable ((flags_on & att_nameref) ? name : newname, 0); /* sets att_invisible for new vars */ + + if (var == 0) + { + any_failed++; + NEXT_VARIABLE (); + } + if (var && nameref_p (var) && readonly_p (var) && nameref_cell (var) && (flags_off & att_nameref)) + { + sh_readonly (name); + any_failed++; + NEXT_VARIABLE (); + } + } + else + var = (SHELL_VAR *)NULL; + + /* If we are declaring a function, then complain about it in some way. + We don't let people make functions by saying `typeset -f foo=bar'. */ + + /* There should be a way, however, to let people look at a particular + function definition by saying `typeset -f foo'. */ + + if (flags_on & att_function) + { + if (offset) /* declare -f [-rix] foo=bar */ + { + builtin_error (_("cannot use `-f' to make functions")); + free (name); + return (EXECUTION_FAILURE); + } + else /* declare -f [-rx] name [name...] */ + { + var = find_function (name); + + if (var) + { + if (readonly_p (var) && (flags_off & att_readonly)) + { + builtin_error (_("%s: readonly function"), name); + any_failed++; + NEXT_VARIABLE (); + } + + /* declare -[Ff] name [name...] */ + if (flags_on == att_function && flags_off == 0) + { +#if defined (DEBUGGER) + if (nodefs && debugging_mode) + { + shell_fn = find_function_def (var->name); + if (shell_fn) + printf ("%s %d %s\n", var->name, shell_fn->line, shell_fn->source_file); + else + printf ("%s\n", var->name); + } + else +#endif /* DEBUGGER */ + { + t = nodefs ? var->name + : named_function_string (name, function_cell (var), FUNC_MULTILINE|FUNC_EXTERNAL); + printf ("%s\n", t); + any_failed = sh_chkwrite (any_failed); + } + } + else /* declare -[fF] -[rx] name [name...] */ + { + VSETATTR (var, flags_on); + VUNSETATTR (var, flags_off); + } + } + else + any_failed++; + NEXT_VARIABLE (); + } + } + else /* declare -[aAinrx] name [name...] */ + { + /* Non-null if we just created or fetched a local variable. */ +#if 0 + /* This is bash-4.3 code. */ + /* Here's what ksh93 seems to do. If we are modifying an existing + nameref variable, we don't follow the nameref chain past the last + nameref, and we set the nameref variable's value so future + references to that variable will return the value of the variable + we're assigning right now. */ +#else + /* Here's what ksh93 seems to do as of the 2012 version: if we are + using declare -n to modify the value of an existing nameref + variable, don't follow the nameref chain at all and just search + for a nameref at the current context. If we have a nameref, + modify its value (changing which variable it references). */ +#endif + if (var == 0 && (flags_on & att_nameref)) + { + /* See if we are trying to modify an existing nameref variable, + but don't follow the nameref chain. */ + var = mkglobal ? find_global_variable_noref (name) : find_variable_noref (name); + if (var && nameref_p (var) == 0) + var = 0; + } + /* However, if we're turning off the nameref attribute on an existing + nameref variable, we first follow the nameref chain to the end, + modify the value of the variable this nameref variable references + if there is an assignment statement argument, + *CHANGING ITS VALUE AS A SIDE EFFECT*, then turn off the nameref + flag *LEAVING THE NAMEREF VARIABLE'S VALUE UNCHANGED* */ + else if (var == 0 && (flags_off & att_nameref)) + { + /* See if we are trying to modify an existing nameref variable */ + refvar = mkglobal ? find_global_variable_last_nameref (name, 0) : find_variable_last_nameref (name, 0); + if (refvar && nameref_p (refvar) == 0) + refvar = 0; + /* If the nameref is readonly but doesn't have a value, ksh93 + allows the nameref attribute to be removed. If it's readonly + and has a value, even if the value doesn't reference an + existing variable, we disallow the modification */ + if (refvar && nameref_cell (refvar) && readonly_p (refvar)) + { + sh_readonly (name); + any_failed++; + NEXT_VARIABLE (); + } + + /* If all we're doing is turning off the nameref attribute, don't + bother with VAR at all, whether it exists or not. Just turn it + off and go on. */ + if (refvar && flags_on == 0 && offset == 0 && (flags_off & ~att_nameref) == 0) + { + VUNSETATTR (refvar, att_nameref); + NEXT_VARIABLE (); + } + + if (refvar) + /* XXX - use declare_find_variable here? */ + var = mkglobal ? find_global_variable (nameref_cell (refvar)) : find_variable (nameref_cell (refvar)); + } +#if defined (ARRAY_VARS) + /* If we have an array assignment to a nameref, remove the nameref + attribute and go on. */ + else if (var == 0 && offset && array_subscript_assignment) + { + var = mkglobal ? find_global_variable_noref (name) : find_variable_noref (name); + if (var && nameref_p (var)) + { + internal_warning (_("%s: removing nameref attribute"), name); + FREE (value_cell (var)); /* XXX - bash-4.3 compat */ + var_setvalue (var, (char *)NULL); + VUNSETATTR (var, att_nameref); + } + } +#endif + + /* See if we are trying to set flags or value (or create) for an + existing nameref that points to a non-existent variable: e.g., + declare -n foo=bar + unset foo # unsets bar + declare -i foo + foo=4+4 + declare -p foo */ + if (var == 0 && (mkglobal || flags_on || flags_off || offset)) + { + refvar = mkglobal ? find_global_variable_last_nameref (name, 0) : find_variable_last_nameref (name, 0); + if (refvar && nameref_p (refvar) == 0) + refvar = 0; + if (refvar) + /* XXX - use declare_find_variable here? */ + var = mkglobal ? find_global_variable (nameref_cell (refvar)) : find_variable (nameref_cell (refvar)); + if (refvar && var == 0) + { + oldname = name; /* need to free this */ + + namelen = strlen (nameref_cell (refvar)); +#if defined (ARRAY_VARS) + if (subscript_start) + { + *subscript_start = '['; /*]*/ + namelen += strlen (subscript_start); + } +#endif + name = xmalloc (namelen + 2 + strlen (value) + 1); + strcpy (name, nameref_cell (refvar)); +#if defined (ARRAY_VARS) + if (subscript_start) + strcpy (name + strlen (nameref_cell (refvar)), subscript_start); +#endif + /* We are committed to using the new name, so reset */ + if (offset) + { + /* Rebuild assignment and restore offset and value */ + if (aflags & ASS_APPEND) + name[namelen++] = '+'; + name[namelen++] = '='; + if (value && *value) + strcpy (name + namelen, value); + else + name[namelen] = '\0'; + offset = assignment (name, 0); + /* if offset was valid previously, but the substituting + of the nameref value results in an invalid assignment, + throw an invalid identifier error */ + if (offset == 0) + { + free (oldname); + sh_invalidid (name); + assign_error++; + NEXT_VARIABLE (); + } + name[offset] = '\0'; + value = name + namelen; + } + free (oldname); + + /* OK, let's turn off the nameref attribute. + Now everything else applies to VAR. */ + if (flags_off & att_nameref) + VUNSETATTR (refvar, att_nameref); + + goto restart_new_var_name; + /* NOTREACHED */ + } + } + if (var == 0) + var = declare_find_variable (name, mkglobal, chklocal); + +#if defined (ARRAY_VARS) + var_exists = var != 0; + array_exists = var && (array_p (var) || assoc_p (var)); + creating_array = flags_on & (att_array|att_assoc); +#endif + + if (var == 0) + { +#if defined (ARRAY_VARS) + if (flags_on & att_assoc) + { + var = make_new_assoc_variable (name); + if (var && offset == 0 && no_invisible_vars == 0) + VSETATTR (var, att_invisible); + } + else if ((flags_on & att_array) || making_array_special) + { + var = make_new_array_variable (name); + if (var && offset == 0 && no_invisible_vars == 0) + VSETATTR (var, att_invisible); + } + else +#endif + { + var = mkglobal ? bind_global_variable (name, (char *)NULL, ASS_FORCE) : bind_variable (name, (char *)NULL, ASS_FORCE); + if (var && offset == 0 && no_invisible_vars == 0) + VSETATTR (var, att_invisible); + } + if (var == 0) + { + /* Has to appear in brackets */ + NEXT_VARIABLE (); + } + created_var = 1; + } + /* Can't take an existing array variable and make it a nameref */ + else if ((array_p (var) || assoc_p (var)) && (flags_on & att_nameref)) + { + builtin_error (_("%s: reference variable cannot be an array"), name); + assign_error++; + NEXT_VARIABLE (); + } + else if (nameref_p (var) && (flags_on & att_nameref) == 0 && (flags_off & att_nameref) == 0 && offset && valid_nameref_value (value, 1) == 0) + { + builtin_error (_("`%s': invalid variable name for name reference"), value); + any_failed++; + NEXT_VARIABLE (); + } + else if (flags_on & att_nameref) + { +#if 1 + /* Check of offset is to allow an assignment to a nameref var as + part of the declare word to override existing value */ + if (nameref_p (var) == 0 && var_isset (var) && offset == 0 && valid_nameref_value (value_cell (var), 0) == 0) + { + builtin_error (_("`%s': invalid variable name for name reference"), value_cell (var)); + any_failed++; + NEXT_VARIABLE (); + } +#endif + if (readonly_p (var)) + { + sh_readonly (name); + any_failed++; + NEXT_VARIABLE (); + } + /* ksh93 compat: turning on nameref attribute turns off -ilu */ + VUNSETATTR (var, att_integer|att_uppercase|att_lowercase|att_capcase); + } + + /* Cannot use declare +r to turn off readonly attribute. */ + if (readonly_p (var) && (flags_off & att_readonly)) + { + sh_readonly (name_cell (var)); + any_failed++; + NEXT_VARIABLE (); + } + + /* Cannot use declare to assign value to readonly or noassign + variable. */ + if ((readonly_p (var) || noassign_p (var)) && offset) + { + if (readonly_p (var)) + sh_readonly (name); + assign_error++; + NEXT_VARIABLE (); + } + +#if defined (ARRAY_VARS) + /* make declare a[2]=foo as similar to a[2]=foo as possible if + a is already an array or assoc variable. */ + if (array_subscript_assignment && array_exists && creating_array == 0) + simple_array_assign = 1; + else if ((making_array_special || creating_array || array_exists) && offset) + { + int vlen; + vlen = STRLEN (value); +/*itrace("declare_builtin: name = %s value = %s flags = %d", name, value, wflags);*/ + if (shell_compatibility_level > 43 && (wflags & W_COMPASSIGN) == 0 && + value[0] == '(' && value[vlen-1] == ')') + { + /* The warning is only printed when using compound assignment + to an array variable that doesn't already exist. We use + creating_array to allow things like + declare -a foo$bar='(abc)' to work. */ + if (array_exists == 0 && creating_array == 0) + internal_warning (_("%s: quoted compound array assignment deprecated"), list->word->word); + compound_array_assign = array_exists || creating_array; + simple_array_assign = making_array_special; + } + else if (value[0] == '(' && value[vlen-1] == ')' && (shell_compatibility_level < 44 || (wflags & W_COMPASSIGN))) + compound_array_assign = 1; + else + simple_array_assign = 1; + } + + /* Cannot use declare +a name or declare +A name to remove an + array variable. */ + if (((flags_off & att_array) && array_p (var)) || ((flags_off & att_assoc) && assoc_p (var))) + { + builtin_error (_("%s: cannot destroy array variables in this way"), name); + any_failed++; + NEXT_VARIABLE (); + } + + if ((flags_on & att_array) && assoc_p (var)) + { + builtin_error (_("%s: cannot convert associative to indexed array"), name); + any_failed++; + NEXT_VARIABLE (); + } + if ((flags_on & att_assoc) && array_p (var)) + { + builtin_error (_("%s: cannot convert indexed to associative array"), name); + any_failed++; + NEXT_VARIABLE (); + } + + /* declare -A name[[n]] makes name an associative array variable. */ + if (flags_on & att_assoc) + { + if (assoc_p (var) == 0) + var = convert_var_to_assoc (var); + } + /* declare -a name[[n]] or declare name[n] makes name an indexed + array variable. */ + else if ((making_array_special || (flags_on & att_array)) && array_p (var) == 0 && assoc_p (var) == 0) + var = convert_var_to_array (var); +#endif /* ARRAY_VARS */ + + /* XXX - we note that we are turning on nameref attribute and defer + setting it until the assignment has been made so we don't do an + inadvertent nameref lookup. Might have to do the same thing for + flags_off&att_nameref. */ + /* XXX - ksh93 makes it an error to set a readonly nameref variable + using a single typeset command. */ + onref = (flags_on & att_nameref); + flags_on &= ~att_nameref; +#if defined (ARRAY_VARS) + if (array_p (var) || assoc_p (var) + || (offset && compound_array_assign) + || simple_array_assign) + onref = 0; /* array variables may not be namerefs */ +#endif + + /* ksh93 seems to do this */ + offref = (flags_off & att_nameref); + flags_off &= ~att_nameref; + + VSETATTR (var, flags_on); + VUNSETATTR (var, flags_off); + +#if defined (ARRAY_VARS) + if (offset && compound_array_assign) + assign_array_var_from_string (var, value, aflags|ASS_FORCE); + else if (simple_array_assign && subscript_start) + { + int local_aflags; + /* declare [-aA] name[N]=value */ + *subscript_start = '['; /* ] */ + /* XXX - problem here with appending */ + local_aflags = aflags&ASS_APPEND; + local_aflags |= assoc_noexpand ? ASS_NOEXPAND : 0; + var = assign_array_element (name, value, local_aflags); /* XXX - not aflags */ + *subscript_start = '\0'; + if (var == 0) /* some kind of assignment error */ + { + assign_error++; + flags_on |= onref; + flags_off |= offref; + NEXT_VARIABLE (); + } + } + else if (simple_array_assign) + { + /* let bind_{array,assoc}_variable take care of this. */ + if (assoc_p (var)) + bind_assoc_variable (var, name, savestring ("0"), value, aflags|ASS_FORCE); + else + bind_array_variable (name, 0, value, aflags|ASS_FORCE); + } + else +#endif + /* XXX - no ASS_FORCE here */ + /* bind_variable_value duplicates the essential internals of + bind_variable() */ + if (offset) + { + if (onref || nameref_p (var)) + aflags |= ASS_NAMEREF; + v = bind_variable_value (var, value, aflags); + if (v == 0 && (onref || nameref_p (var))) + { + if (valid_nameref_value (value, 1) == 0) + sh_invalidid (value); + assign_error++; + /* XXX - unset this variable? or leave it as normal var? */ + if (created_var) + delete_var (var->name, mkglobal ? global_variables : shell_variables); + flags_on |= onref; /* undo change from above */ + flags_off |= offref; + NEXT_VARIABLE (); + } + } + + /* If we found this variable in the temporary environment, as with + `var=value declare -x var', make sure it is treated identically + to `var=value export var'. Do the same for `declare -r' and + `readonly'. Preserve the attributes, except for att_tempvar. */ + /* XXX -- should this create a variable in the global scope, or + modify the local variable flags? ksh93 has it modify the + global scope. + Need to handle case like in set_var_attribute where a temporary + variable is in the same table as the function local vars. */ + if ((flags_on & (att_exported|att_readonly)) && tempvar_p (var)) + { + SHELL_VAR *tv; + char *tvalue; + + tv = find_tempenv_variable (var->name); + if (tv) + { + tvalue = var_isset (var) ? savestring (value_cell (var)) : savestring (""); + tv = bind_variable (var->name, tvalue, 0); + if (tv) + { + tv->attributes |= var->attributes & ~att_tempvar; + if (tv->context > 0) + VSETATTR (tv, att_propagate); + } + free (tvalue); + } + VSETATTR (var, att_propagate); + } + } + + /* Turn on nameref attribute we deferred above. */ + /* XXX - should we turn on the noassign attribute for consistency with + ksh93 when we turn on the nameref attribute? */ + VSETATTR (var, onref); + flags_on |= onref; + VUNSETATTR (var, offref); + flags_off |= offref; + /* Yuck. ksh93 compatibility. XXX - need to investigate more but + definitely happens when turning off nameref attribute on nameref + (see comments above). Under no circumstances allow this to turn + off readonly attribute on readonly nameref variable. */ + if (refvar) + { + if (flags_off & att_readonly) + flags_off &= ~att_readonly; + VUNSETATTR (refvar, flags_off); + } + + stupidly_hack_special_variables (name); + + NEXT_VARIABLE (); + } + + return (assign_error ? EX_BADASSIGN + : ((any_failed == 0) ? EXECUTION_SUCCESS + : EXECUTION_FAILURE)); +} |