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gawkapi.c
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gawkapi.c
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/*
* gawkapi.c -- Implement the functions defined for gawkapi.h
*/
/*
* Copyright (C) 2012-2018 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK 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.
*
* GAWK 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "awk.h"
#ifdef HAVE_MPFR
#define getmpfr(n) getblock(n, BLOCK_MPFR, mpfr_ptr)
#define freempfr(n) freeblock(n, BLOCK_MPFR)
#define getmpz(n) getblock(n, BLOCK_MPZ, mpz_ptr)
#define freempz(n) freeblock(n, BLOCK_MPZ)
#endif
/* Declare some globals used by api_get_file: */
extern IOBUF *curfile;
extern INSTRUCTION *main_beginfile;
extern int currule;
static awk_bool_t node_to_awk_value(NODE *node, awk_value_t *result, awk_valtype_t wanted);
static char *valtype2str(awk_valtype_t type);
/*
* api_get_argument --- get the count'th paramater, zero-based.
*
* Returns false if count is out of range, or if actual paramater
* does not match what is specified in wanted. In the latter
* case, fills in result->val_type with the actual type.
*/
static awk_bool_t
api_get_argument(awk_ext_id_t id, size_t count,
awk_valtype_t wanted, awk_value_t *result)
{
#ifdef DYNAMIC
NODE *arg;
if (result == NULL)
return awk_false;
(void) id;
/* set up default result */
memset(result, 0, sizeof(*result));
result->val_type = AWK_UNDEFINED;
/*
* Song and dance here. get_array_argument() and get_scalar_argument()
* will force a change in type of a parameter that is Node_var_new.
*
* Start by looking at the unadulterated argument as it was passed.
*/
arg = get_argument(count);
if (arg == NULL)
return awk_false;
/* if type is undefined */
if (arg->type == Node_var_new) {
if (wanted == AWK_UNDEFINED)
return true;
else if (wanted == AWK_ARRAY) {
goto array;
} else {
goto scalar;
}
}
/* at this point, we have real type */
if (arg->type == Node_var_array || arg->type == Node_array_ref) {
if (wanted != AWK_ARRAY && wanted != AWK_UNDEFINED)
return false;
goto array;
} else
goto scalar;
array:
/* get the array here */
arg = get_array_argument(arg, count);
if (arg == NULL)
return awk_false;
return node_to_awk_value(arg, result, wanted);
scalar:
/* at this point we have a real type that is not an array */
arg = get_scalar_argument(arg, count);
if (arg == NULL)
return awk_false;
return node_to_awk_value(arg, result, wanted);
#else
return awk_false;
#endif
}
/* api_set_argument --- convert an argument to an array */
static awk_bool_t
api_set_argument(awk_ext_id_t id,
size_t count,
awk_array_t new_array)
{
#ifdef DYNAMIC
NODE *arg;
NODE *array = (NODE *) new_array;
(void) id;
if (array == NULL || array->type != Node_var_array)
return awk_false;
if ( (arg = get_argument(count)) == NULL
|| arg->type != Node_var_new)
return awk_false;
arg = get_array_argument(arg, count);
if (arg == NULL)
return awk_false;
array->vname = arg->vname;
*arg = *array;
freenode(array);
return awk_true;
#else
return awk_false;
#endif
}
/* awk_value_to_node --- convert a value into a NODE */
NODE *
awk_value_to_node(const awk_value_t *retval)
{
NODE *ext_ret_val = NULL;
NODE *v;
if (retval == NULL)
fatal(_("awk_value_to_node: received null retval"));
switch (retval->val_type) {
case AWK_ARRAY:
ext_ret_val = (NODE *) retval->array_cookie;
break;
case AWK_UNDEFINED:
ext_ret_val = dupnode(Nnull_string);
break;
case AWK_NUMBER:
switch (retval->num_type) {
case AWK_NUMBER_TYPE_DOUBLE:
ext_ret_val = make_number(retval->num_value);
break;
case AWK_NUMBER_TYPE_MPFR:
#ifdef HAVE_MPFR
if (! do_mpfr)
fatal(_("awk_value_to_node: not in MPFR mode"));
ext_ret_val = make_number_node(MPFN);
memcpy(&ext_ret_val->mpg_numbr, retval->num_ptr, sizeof(ext_ret_val->mpg_numbr));
freempfr(retval->num_ptr);
#else
fatal(_("awk_value_to_node: MPFR not supported"));
#endif
break;
case AWK_NUMBER_TYPE_MPZ:
#ifdef HAVE_MPFR
if (! do_mpfr)
fatal(_("awk_value_to_node: not in MPFR mode"));
ext_ret_val = make_number_node(MPZN);
memcpy(&ext_ret_val->mpg_i, retval->num_ptr, sizeof(ext_ret_val->mpg_i));
freempz(retval->num_ptr);
#else
fatal(_("awk_value_to_node: MPFR not supported"));
#endif
break;
default:
fatal(_("awk_value_to_node: invalid number type `%d'"), retval->num_type);
break;
}
break;
case AWK_STRING:
ext_ret_val = make_str_node(retval->str_value.str,
retval->str_value.len, ALREADY_MALLOCED);
break;
case AWK_STRNUM:
ext_ret_val = make_str_node(retval->str_value.str,
retval->str_value.len, ALREADY_MALLOCED);
ext_ret_val->flags |= USER_INPUT;
break;
case AWK_REGEX:
ext_ret_val = make_typed_regex(retval->str_value.str,
retval->str_value.len);
break;
case AWK_SCALAR:
v = (NODE *) retval->scalar_cookie;
if (v->type != Node_var)
ext_ret_val = NULL;
else
ext_ret_val = dupnode(v->var_value);
break;
case AWK_VALUE_COOKIE:
ext_ret_val = dupnode((NODE *)(retval->value_cookie));
break;
default: /* any invalid type */
ext_ret_val = NULL;
break;
}
return ext_ret_val;
}
/* Functions to print messages */
/* api_fatal --- print a fatal message and exit */
static void
api_fatal(awk_ext_id_t id, const char *format, ...)
{
va_list args;
(void) id;
va_start(args, format);
err(true, _("fatal: "), format, args);
va_end(args);
}
/* api_nonfatal --- print a non fatal error message */
static void
api_nonfatal(awk_ext_id_t id, const char *format, ...)
{
va_list args;
(void) id;
va_start(args, format);
err(false, _("error: "), format, args);
va_end(args);
}
/* api_warning --- print a warning message */
static void
api_warning(awk_ext_id_t id, const char *format, ...)
{
va_list args;
(void) id;
va_start(args, format);
err(false, _("warning: "), format, args);
va_end(args);
}
/* api_lintwarn --- print a lint warning message and exit if appropriate */
static void
api_lintwarn(awk_ext_id_t id, const char *format, ...)
{
va_list args;
(void) id;
va_start(args, format);
if (lintwarn == r_fatal) {
err(true, _("fatal: "), format, args);
} else {
err(false, _("warning: "), format, args);
}
va_end(args);
}
/* api_register_input_parser --- register an input_parser; for opening files read-only */
static void
api_register_input_parser(awk_ext_id_t id, awk_input_parser_t *input_parser)
{
(void) id;
if (input_parser == NULL)
return;
register_input_parser(input_parser);
}
/* api_register_output_wrapper --- register an output wrapper, for writing files / two-way pipes */
static void api_register_output_wrapper(awk_ext_id_t id,
awk_output_wrapper_t *output_wrapper)
{
(void) id;
if (output_wrapper == NULL)
return;
register_output_wrapper(output_wrapper);
}
/* api_register_two_way_processor --- register a processor for two way I/O */
static void
api_register_two_way_processor(awk_ext_id_t id,
awk_two_way_processor_t *two_way_processor)
{
(void) id;
if (two_way_processor == NULL)
return;
register_two_way_processor(two_way_processor);
}
/* Functions to update ERRNO */
/* api_update_ERRNO_int --- update ERRNO with an integer value */
static void
api_update_ERRNO_int(awk_ext_id_t id, int errno_val)
{
(void) id;
update_ERRNO_int(errno_val);
}
/* api_update_ERRNO_string --- update ERRNO with a string value */
static void
api_update_ERRNO_string(awk_ext_id_t id,
const char *string)
{
(void) id;
if (string == NULL)
return;
update_ERRNO_string(string);
}
/* api_unset_ERRNO --- unset ERRNO */
static void
api_unset_ERRNO(awk_ext_id_t id)
{
(void) id;
unset_ERRNO();
}
/* api_add_ext_func --- add a function to the interpreter, returns true upon success */
static awk_bool_t
api_add_ext_func(awk_ext_id_t id,
const char *namespace,
awk_ext_func_t *func)
{
(void) id;
(void) namespace;
if (func == NULL)
return awk_false;
#ifdef DYNAMIC
return make_builtin(func);
#else
return awk_false;
#endif
}
/* Stuff for exit handler - do it as linked list */
struct ext_exit_handler {
struct ext_exit_handler *next;
void (*funcp)(void *data, int exit_status);
void *arg0;
};
static struct ext_exit_handler *list_head = NULL;
/* run_ext_exit_handlers --- run the extension exit handlers, LIFO order */
void
run_ext_exit_handlers(int exitval)
{
struct ext_exit_handler *p, *next;
for (p = list_head; p != NULL; p = next) {
next = p->next;
p->funcp(p->arg0, exitval);
free(p);
}
list_head = NULL;
}
/* api_awk_atexit --- add an exit call back */
static void
api_awk_atexit(awk_ext_id_t id,
void (*funcp)(void *data, int exit_status),
void *arg0)
{
struct ext_exit_handler *p;
(void) id;
if (funcp == NULL)
return;
/* allocate memory */
emalloc(p, struct ext_exit_handler *, sizeof(struct ext_exit_handler), "api_awk_atexit");
/* fill it in */
p->funcp = funcp;
p->arg0 = arg0;
/* add to linked list, LIFO order */
p->next = list_head;
list_head = p;
}
static struct {
char **strings;
size_t i, size;
} scopy;
/* free_api_string_copies --- release memory used by string copies */
void
free_api_string_copies()
{
size_t i;
for (i = 0; i < scopy.i; i++)
free(scopy.strings[i]);
scopy.i = 0;
}
/* assign_string --- return a string node with NUL termination */
static inline void
assign_string(NODE *node, awk_value_t *val, awk_valtype_t val_type)
{
val->val_type = val_type;
if (node->stptr[node->stlen] != '\0') {
/*
* This is an unterminated field string, so make a copy.
* This should happen only for $n where n > 0 and n < NF.
*/
char *s;
assert((node->flags & MALLOC) == 0);
if (scopy.i == scopy.size) {
/* expand list */
if (scopy.size == 0)
scopy.size = 8; /* initial size */
else
scopy.size *= 2;
erealloc(scopy.strings, char **, scopy.size * sizeof(char *), "assign_string");
}
emalloc(s, char *, node->stlen + 1, "assign_string");
memcpy(s, node->stptr, node->stlen);
s[node->stlen] = '\0';
val->str_value.str = scopy.strings[scopy.i++] = s;
}
else
val->str_value.str = node->stptr;
val->str_value.len = node->stlen;
}
/* assign_number -- return a number node */
#define assign_double(val) \
val->num_value = node->numbr; \
val->num_type = AWK_NUMBER_TYPE_DOUBLE; \
val->num_ptr = NULL
static inline void
assign_number(NODE *node, awk_value_t *val)
{
val->val_type = AWK_NUMBER;
#ifndef HAVE_MPFR
assign_double(val);
#else
switch (node->flags & (MPFN|MPZN)) {
case 0:
assign_double(val);
break;
case MPFN:
val->num_value = mpfr_get_d(node->mpg_numbr, ROUND_MODE);
val->num_type = AWK_NUMBER_TYPE_MPFR;
val->num_ptr = &node->mpg_numbr;
break;
case MPZN:
val->num_value = mpz_get_d(node->mpg_i);
val->num_type = AWK_NUMBER_TYPE_MPZ;
val->num_ptr = &node->mpg_i;
break;
default:
fatal(_("node_to_awk_value: detected invalid numeric flags combination `%s'; please file a bug report."), flags2str(node->flags));
break;
}
#endif
}
#undef assign_double
/* assign_regex --- return a regex node */
static inline void
assign_regex(NODE *node, awk_value_t *val)
{
/* a REGEX node cannot be an unterminated field string */
assert((node->flags & MALLOC) != 0);
assert(node->stptr[node->stlen] == '\0');
val->str_value.str = node->stptr;
val->str_value.len = node->stlen;
val->val_type = AWK_REGEX;
}
/* node_to_awk_value --- convert a node into a value for an extension */
static awk_bool_t
node_to_awk_value(NODE *node, awk_value_t *val, awk_valtype_t wanted)
{
awk_bool_t ret = awk_false;
if (node == NULL)
fatal(_("node_to_awk_value: received null node"));
if (val == NULL)
fatal(_("node_to_awk_value: received null val"));
switch (node->type) {
case Node_var_new: /* undefined variable */
val->val_type = AWK_UNDEFINED;
if (wanted == AWK_UNDEFINED) {
ret = awk_true;
}
break;
case Node_var:
/* a scalar value */
if (wanted == AWK_SCALAR) {
val->val_type = AWK_SCALAR;
val->scalar_cookie = (void *) node;
ret = awk_true;
break;
}
node = node->var_value;
/* FALL THROUGH */
case Node_val:
/* a scalar value */
switch (wanted) {
case AWK_NUMBER:
if (node->flags & REGEX)
val->val_type = AWK_REGEX;
else {
(void) force_number(node);
assign_number(node, val);
ret = awk_true;
}
break;
case AWK_STRNUM:
switch (fixtype(node)->flags & (STRING|NUMBER|USER_INPUT|REGEX)) {
case STRING:
val->val_type = AWK_STRING;
break;
case NUMBER:
(void) force_string(node);
/* fall through */
case NUMBER|USER_INPUT:
assign_string(node, val, AWK_STRNUM);
ret = awk_true;
break;
case REGEX:
val->val_type = AWK_REGEX;
break;
case NUMBER|STRING:
if (node == Nnull_string) {
val->val_type = AWK_UNDEFINED;
break;
}
/* fall through */
default:
warning(_("node_to_awk_value detected invalid flags combination `%s'; please file a bug report."), flags2str(node->flags));
val->val_type = AWK_UNDEFINED;
break;
}
break;
case AWK_STRING:
(void) force_string(node);
assign_string(node, val, AWK_STRING);
ret = awk_true;
break;
case AWK_REGEX:
switch (fixtype(node)->flags & (STRING|NUMBER|USER_INPUT|REGEX)) {
case STRING:
val->val_type = AWK_STRING;
break;
case NUMBER:
val->val_type = AWK_NUMBER;
break;
case NUMBER|USER_INPUT:
val->val_type = AWK_STRNUM;
break;
case REGEX:
assign_regex(node, val);
ret = awk_true;
break;
case NUMBER|STRING:
if (node == Nnull_string) {
val->val_type = AWK_UNDEFINED;
break;
}
/* fall through */
default:
warning(_("node_to_awk_value detected invalid flags combination `%s'; please file a bug report."), flags2str(node->flags));
val->val_type = AWK_UNDEFINED;
break;
}
break;
case AWK_SCALAR:
switch (fixtype(node)->flags & (STRING|NUMBER|USER_INPUT|REGEX)) {
case STRING:
val->val_type = AWK_STRING;
break;
case NUMBER:
val->val_type = AWK_NUMBER;
break;
case NUMBER|USER_INPUT:
val->val_type = AWK_STRNUM;
break;
case REGEX:
val->val_type = AWK_REGEX;
break;
case NUMBER|STRING:
if (node == Nnull_string) {
val->val_type = AWK_UNDEFINED;
break;
}
/* fall through */
default:
warning(_("node_to_awk_value detected invalid flags combination `%s'; please file a bug report."), flags2str(node->flags));
val->val_type = AWK_UNDEFINED;
break;
}
break;
case AWK_UNDEFINED:
/* return true and actual type for request of undefined */
switch (fixtype(node)->flags & (STRING|NUMBER|USER_INPUT|REGEX)) {
case STRING:
assign_string(node, val, AWK_STRING);
ret = awk_true;
break;
case NUMBER:
assign_number(node, val);
ret = awk_true;
break;
case NUMBER|USER_INPUT:
assign_string(node, val, AWK_STRNUM);
ret = awk_true;
break;
case REGEX:
assign_regex(node, val);
ret = awk_true;
break;
case NUMBER|STRING:
if (node == Nnull_string) {
val->val_type = AWK_UNDEFINED;
ret = awk_true;
break;
}
/* fall through */
default:
warning(_("node_to_awk_value detected invalid flags combination `%s'; please file a bug report."), flags2str(node->flags));
val->val_type = AWK_UNDEFINED;
break;
}
break;
case AWK_ARRAY:
case AWK_VALUE_COOKIE:
break;
}
break;
case Node_var_array:
val->val_type = AWK_ARRAY;
if (wanted == AWK_ARRAY || wanted == AWK_UNDEFINED) {
val->array_cookie = node;
ret = awk_true;
} else
ret = awk_false;
break;
default:
val->val_type = AWK_UNDEFINED;
ret = awk_false;
break;
}
return ret;
}
/*
* Symbol table access:
* - No access to special variables (NF, etc.)
* - One special exception: PROCINFO.
* - Use sym_update() to change a value, including from UNDEFINED
* to scalar or array.
*/
/*
* Lookup a variable, fills in value. No messing with the value
* returned. Returns false if the variable doesn't exist
* or the wrong type was requested.
* In the latter case, fills in vaule->val_type with the real type.
* Built-in variables (except PROCINFO) may not be accessed by an extension.
*/
/* api_sym_lookup --- look up a symbol */
static awk_bool_t
api_sym_lookup(awk_ext_id_t id,
const char *name,
awk_valtype_t wanted,
awk_value_t *result)
{
NODE *node;
update_global_values(); /* make sure stuff like NF, NR, are up to date */
if ( name == NULL
|| *name == '\0'
|| result == NULL
|| (node = lookup(name)) == NULL)
return awk_false;
if (is_off_limits_var(name)) /* a built-in variable */
node->flags |= NO_EXT_SET;
return node_to_awk_value(node, result, wanted);
}
/* api_sym_lookup_scalar --- retrieve the current value of a scalar */
static awk_bool_t
api_sym_lookup_scalar(awk_ext_id_t id,
awk_scalar_t cookie,
awk_valtype_t wanted,
awk_value_t *result)
{
NODE *node = (NODE *) cookie;
if (node == NULL
|| result == NULL
|| node->type != Node_var)
return awk_false;
update_global_values(); /* make sure stuff like NF, NR, are up to date */
return node_to_awk_value(node, result, wanted);
}
/* api_sym_update --- update a symbol's value, see gawkapi.h for semantics */
static awk_bool_t
api_sym_update(awk_ext_id_t id,
const char *name,
awk_value_t *value)
{
NODE *node;
NODE *array_node;
if ( name == NULL
|| *name == '\0'
|| value == NULL)
return awk_false;
switch (value->val_type) {
case AWK_NUMBER:
case AWK_STRNUM:
case AWK_STRING:
case AWK_REGEX:
case AWK_UNDEFINED:
case AWK_ARRAY:
case AWK_SCALAR:
case AWK_VALUE_COOKIE:
break;
default:
/* fatal(_("api_sym_update: invalid value for type of new value (%d)"), value->val_type); */
return awk_false;
}
node = lookup(name);
if (node == NULL) {
/* new value to be installed */
if (value->val_type == AWK_ARRAY) {
array_node = awk_value_to_node(value);
node = install_symbol(estrdup((char *) name, strlen(name)),
Node_var_array);
array_node->vname = node->vname;
*node = *array_node;
freenode(array_node);
value->array_cookie = node; /* pass new cookie back to extension */
} else {
/* regular variable */
node = install_symbol(estrdup((char *) name, strlen(name)),
Node_var);
node->var_value = awk_value_to_node(value);
}
return awk_true;
}
/*
* If we get here, then it exists already. Any valid type is
* OK except for AWK_ARRAY.
*/
if ( (node->flags & NO_EXT_SET) != 0
|| is_off_limits_var(name)) { /* most built-in vars not allowed */
node->flags |= NO_EXT_SET;
return awk_false;
}
if ( value->val_type != AWK_ARRAY
&& (node->type == Node_var || node->type == Node_var_new)) {
unref(node->var_value);
node->var_value = awk_value_to_node(value);
if (node->type == Node_var_new && value->val_type != AWK_UNDEFINED)
node->type = Node_var;
return awk_true;
}
return awk_false;
}
/* api_sym_update_scalar --- update a scalar cookie */
static awk_bool_t
api_sym_update_scalar(awk_ext_id_t id,
awk_scalar_t cookie,
awk_value_t *value)
{
NODE *node = (NODE *) cookie;
if (value == NULL
|| node == NULL
|| node->type != Node_var
|| (node->flags & NO_EXT_SET) != 0)
return awk_false;
/*
* Optimization: if valref is 1, and the new value is a string or
* a number, we can avoid calling unref and then making a new node
* by simply installing the new value. First, we follow the same
* recipe used by node.c:r_unref to wipe the current values, and then
* we copy the logic from r_make_number or make_str_node to install
* the new value.
*/
switch (value->val_type) {
case AWK_NUMBER:
if (node->var_value->valref == 1 && ! do_mpfr) {
NODE *r = node->var_value;
/* r_unref: */
if ((r->flags & (MALLOC|STRCUR)) == (MALLOC|STRCUR))
efree(r->stptr);
free_wstr(r);
/* r_make_number: */
r->numbr = value->num_value;
r->flags = MALLOC|NUMBER|NUMCUR;
r->stptr = NULL;
r->stlen = 0;
return awk_true;
}
break;
case AWK_STRING:
case AWK_STRNUM:
if (node->var_value->valref == 1) {
NODE *r = node->var_value;
/* r_unref: */
if ((r->flags & (MALLOC|STRCUR)) == (MALLOC|STRCUR))
efree(r->stptr);
mpfr_unset(r);
free_wstr(r);
/* make_str_node(s, l, ALREADY_MALLOCED): */
r->numbr = 0;
r->flags = (MALLOC|STRING|STRCUR);
if (value->val_type == AWK_STRNUM)
r->flags |= USER_INPUT;
r->stfmt = STFMT_UNUSED;
r->stptr = value->str_value.str;
r->stlen = value->str_value.len;
#ifdef HAVE_MPFR
r->strndmode = MPFR_round_mode;
#endif
return awk_true;
}
break;
case AWK_REGEX:
case AWK_UNDEFINED:
case AWK_SCALAR:
case AWK_VALUE_COOKIE:
break;
default: /* AWK_ARRAY or invalid type */
return awk_false;
}
/* do it the hard (slow) way */
unref(node->var_value);
node->var_value = awk_value_to_node(value);
return awk_true;
}
/*
* valid_subscript_type --- test if a type is allowed for an array subscript.
*
* Any scalar value is fine, so only AWK_ARRAY (or an invalid type) is illegal.
*/
static inline bool
valid_subscript_type(awk_valtype_t valtype)
{
switch (valtype) {
case AWK_UNDEFINED:
case AWK_NUMBER:
case AWK_STRNUM:
case AWK_STRING:
case AWK_REGEX:
case AWK_SCALAR:
case AWK_VALUE_COOKIE:
return true;
default: /* AWK_ARRAY or an invalid type */
return false;
}
}
/* Array management */
/*
* api_get_array_element --- teturn the value of an element - read only!
*
* Use set_array_element to change it.
*/
static awk_bool_t
api_get_array_element(awk_ext_id_t id,
awk_array_t a_cookie,
const awk_value_t *const index,
awk_valtype_t wanted,
awk_value_t *result)
{
NODE *array = (NODE *) a_cookie;
NODE *subscript;
NODE **aptr;
/* don't check for index len zero, null str is ok as index */
if ( array == NULL
|| array->type != Node_var_array
|| result == NULL
|| index == NULL
|| ! valid_subscript_type(index->val_type))
return awk_false;