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akbasic/src/runtime_functions.c
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Port onto libakstdlib 2b79aca and convert the eight bool predicates 
akbasic's src/ now calls libakstdlib 313 times and raw libc 7 -- 2.2%
bypassed, against 86.4% on the same tree before this. The submodule bump
669b2b3 -> 2b79aca needed no source change of its own: the release is
drop-in for what akbasic already used.

Seven of the eight sites the earlier port left on raw libc change their own
signature rather than swallowing an error, per andrew's ruling on
libakstdlib#38. word_is, the is_waiting_for pair, the scanner's is_at_end,
peek, peek_next and match_next_char, format.c's overflow, and sink_akgl's
scroll/newline/putchar_at/echo_line/edit_key chain all return an
akerr_ErrorContext * and hand the answer back through an out parameter.
is_waiting_for and is_waiting_for_any are a public header change; every
call site that used one as a term in a condition hoists it into a
statement first.

verb_compare is the eighth and stays on strcmp. bsearch(3) fixes the
comparator's signature, so there is no out parameter to report through --
which is what libakstdlib#38 concluded. It carries a comment saying so and
saying why the bypass is safe there.

Six snprintf sites stay raw because they want truncation as an answer
rather than an error, and aksl_snprintf cannot express that until
libakstdlib#34 hands the required length back. Each of the six says so at
the site. Two of them, in host.c, are a latent defect rather than a
decision: a host type name over 31 characters truncates silently and two
sharing a prefix then collide, where structtype.c refuses the same case.

DLOAD leaked a file descriptor. Its read loop sat inside an ATTEMPT and the
PASS in it returned past CLEANUP, so a scan error left the file open.
Hoisting the loop into its own helper to convert fgets fixes it.

Refs libakstdlib#26, libakstdlib#38

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-03 15:41:49 -04:00

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/**
* @file runtime_functions.c
* @brief The built-in function implementations.
*
* Ported from basicruntime_functions.go. The reference bootstraps its function
* table by running a BASIC program of DEF statements through the interpreter at
* startup and then nulling out the expressions so the native handlers take over
* -- except MOD, SPC and STR, which stay as BASIC expressions. None of that is
* reproduced: the signatures are data in the dispatch table and all three of
* those are ordinary native handlers here, which removes the need to run the
* interpreter before the interpreter is ready.
*/
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
#include <akerror.h>
#include <akstdlib.h>
#include <akbasic/error.h>
#include <akbasic/runtime.h>
#include "verbs.h"
/*
* Every builtin starts the same way: find the argument list, evaluate the first
* argument, and hand back a fresh value to write the answer into. Arity is
* already guaranteed by the parser against the table's arity column.
*/
static akerr_ErrorContext *first_arg(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, const char *fname, akbasic_ASTLeaf **argleaf, akbasic_Value **argvalue, akbasic_Value **out)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *arg = NULL;
FAIL_ZERO_RETURN(errctx, (expr != NULL), AKERR_NULLPOINTER, "NIL leaf");
arg = akbasic_leaf_first_argument(expr);
FAIL_ZERO_RETURN(errctx, (arg != NULL), AKBASIC_ERR_SYNTAX,
"%s expected an argument", fname);
if ( argvalue != NULL ) {
PASS(errctx, akbasic_runtime_evaluate(obj, arg, argvalue));
}
if ( out != NULL ) {
PASS(errctx, akbasic_environment_new_value(obj->environment, out));
PASS(errctx, akbasic_value_zero(*out));
}
if ( argleaf != NULL ) {
*argleaf = arg;
}
SUCCEED_RETURN(errctx);
}
/* Coerce an integer-or-float argument to double, the shape every trig call wants. */
static akerr_ErrorContext *arg_as_double(akbasic_Value *value, const char *fname, double *dest)
{
PREPARE_ERROR(errctx);
if ( value->valuetype == AKBASIC_TYPE_INTEGER ) {
*dest = (double)value->intval;
SUCCEED_RETURN(errctx);
}
if ( value->valuetype == AKBASIC_TYPE_FLOAT ) {
*dest = value->floatval;
SUCCEED_RETURN(errctx);
}
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "%s expected integer or float", fname);
}
/* The trig family differs only by the libm call, so it is one shape. */
#define DEFINE_MATH_FUNCTION(__cname, __basicname, __call) \
akerr_ErrorContext *__cname(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, \
akbasic_Value *lval, akbasic_Value *rval, \
akbasic_Value **dest) \
{ \
PREPARE_ERROR(errctx); \
akbasic_Value *arg = NULL; \
akbasic_Value *out = NULL; \
double input = 0.0; \
\
(void)lval; (void)rval; \
PASS(errctx, first_arg(obj, expr, __basicname, NULL, &arg, &out)); \
PASS(errctx, arg_as_double(arg, __basicname, &input)); \
out->valuetype = AKBASIC_TYPE_FLOAT; \
out->floatval = __call(input); \
*dest = out; \
SUCCEED_RETURN(errctx); \
}
DEFINE_MATH_FUNCTION(akbasic_fn_atn, "ATN", atan)
DEFINE_MATH_FUNCTION(akbasic_fn_cos, "COS", cos)
DEFINE_MATH_FUNCTION(akbasic_fn_sin, "SIN", sin)
DEFINE_MATH_FUNCTION(akbasic_fn_tan, "TAN", tan)
DEFINE_MATH_FUNCTION(akbasic_fn_log, "LOG", log)
akerr_ErrorContext *akbasic_fn_abs(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "ABS", NULL, &arg, &out));
if ( arg->valuetype == AKBASIC_TYPE_INTEGER ) {
out->valuetype = AKBASIC_TYPE_INTEGER;
out->intval = (arg->intval < 0 ? -arg->intval : arg->intval);
} else if ( arg->valuetype == AKBASIC_TYPE_FLOAT ) {
out->valuetype = AKBASIC_TYPE_FLOAT;
out->floatval = fabs(arg->floatval);
} else {
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "ABS expected integer or float");
}
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_rad(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
double input = 0.0;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "RAD", NULL, &arg, &out));
PASS(errctx, arg_as_double(arg, "RAD", &input));
out->valuetype = AKBASIC_TYPE_FLOAT;
out->floatval = input * (M_PI / 180.0);
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_sgn(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
double input = 0.0;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "SGN", NULL, &arg, &out));
PASS(errctx, arg_as_double(arg, "SGN", &input));
out->valuetype = AKBASIC_TYPE_INTEGER;
out->intval = (input < 0.0 ? -1 : (input > 0.0 ? 1 : 0));
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_chr(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
int64_t codepoint = 0;
int written = 0;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "CHR", NULL, &arg, &out));
FAIL_NONZERO_RETURN(errctx, (arg->valuetype != AKBASIC_TYPE_INTEGER), AKBASIC_ERR_TYPE,
"CHR expected an integer codepoint");
codepoint = arg->intval;
FAIL_ZERO_RETURN(errctx, (codepoint >= 0 && codepoint <= 0x10FFFF), AKBASIC_ERR_VALUE,
"CHR codepoint %" PRId64 " is outside Unicode", codepoint);
/* UTF-8 encode, matching the reference's string(rune(x)). */
out->valuetype = AKBASIC_TYPE_STRING;
if ( codepoint < 0x80 ) {
out->stringval[written++] = (char)codepoint;
} else if ( codepoint < 0x800 ) {
out->stringval[written++] = (char)(0xC0 | (codepoint >> 6));
out->stringval[written++] = (char)(0x80 | (codepoint & 0x3F));
} else if ( codepoint < 0x10000 ) {
out->stringval[written++] = (char)(0xE0 | (codepoint >> 12));
out->stringval[written++] = (char)(0x80 | ((codepoint >> 6) & 0x3F));
out->stringval[written++] = (char)(0x80 | (codepoint & 0x3F));
} else {
out->stringval[written++] = (char)(0xF0 | (codepoint >> 18));
out->stringval[written++] = (char)(0x80 | ((codepoint >> 12) & 0x3F));
out->stringval[written++] = (char)(0x80 | ((codepoint >> 6) & 0x3F));
out->stringval[written++] = (char)(0x80 | (codepoint & 0x3F));
}
out->stringval[written] = '\0';
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_hex(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
int written = 0;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "HEX", NULL, &arg, &out));
FAIL_NONZERO_RETURN(errctx, (arg->valuetype != AKBASIC_TYPE_INTEGER), AKBASIC_ERR_TYPE,
"HEX expected an integer");
out->valuetype = AKBASIC_TYPE_STRING;
/*
* aksl_snprintf refuses to truncate, which costs nothing here: sixteen hex
* digits is the longest an int64_t can be and a string value holds far more.
*/
PASS(errctx, aksl_snprintf(&written, out->stringval, sizeof(out->stringval),
"%" PRIx64, arg->intval));
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_str(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "STR", NULL, &arg, &out));
/*
* The reference defines this as `"" + X#`, so it renders exactly the way
* string concatenation does -- an integer as %d and a float as %f.
*/
PASS(errctx, akbasic_value_to_string(arg, out->stringval, sizeof(out->stringval)));
out->valuetype = AKBASIC_TYPE_STRING;
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_spc(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
int64_t i = 0;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "SPC", NULL, &arg, &out));
FAIL_NONZERO_RETURN(errctx, (arg->valuetype != AKBASIC_TYPE_INTEGER), AKBASIC_ERR_TYPE,
"SPC expected an integer");
FAIL_ZERO_RETURN(errctx, (arg->intval >= 0 && arg->intval < AKBASIC_MAX_STRING_LENGTH),
AKBASIC_ERR_VALUE,
"SPC count %" PRId64 " is outside 0..%d",
arg->intval, AKBASIC_MAX_STRING_LENGTH - 1);
out->valuetype = AKBASIC_TYPE_STRING;
for ( i = 0; i < arg->intval; i++ ) {
out->stringval[i] = ' ';
}
out->stringval[arg->intval] = '\0';
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_val(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "VAL", NULL, &arg, &out));
FAIL_NONZERO_RETURN(errctx, (arg->valuetype != AKBASIC_TYPE_STRING), AKBASIC_ERR_TYPE,
"VAL expected a string");
out->valuetype = AKBASIC_TYPE_FLOAT;
/*
* Through the strict converter, never aksl_atof: that family cannot report a
* failure, so VAL("garbage") would quietly answer 0.0 instead of raising.
* See TODO.md section 1.9.
*/
PASS(errctx, aksl_atof(arg->stringval, &out->floatval));
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_len(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *argleaf = NULL;
akbasic_Value *strval = NULL;
akbasic_Value *out = NULL;
akbasic_Variable *variable = NULL;
size_t length = 0;
(void)lval; (void)rval;
/*
* LEN must not evaluate a non-string argument. `LEN(A#)` on a
* multi-dimensional array is legal and asks for the element count, but
* evaluating a bare identifier supplies the single subscript {0}, which a
* two-dimensional variable rightly rejects. So: inspect the leaf, and only
* evaluate when it is a string.
*/
PASS(errctx, first_arg(obj, expr, "LEN", &argleaf, NULL, NULL));
FAIL_ZERO_RETURN(errctx,
(akbasic_leaf_is_identifier(argleaf) || akbasic_leaf_is_literal(argleaf)),
AKBASIC_ERR_SYNTAX, "Expected identifier or string literal");
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_INTEGER;
if ( argleaf->leaftype == AKBASIC_LEAF_LITERAL_STRING ||
argleaf->leaftype == AKBASIC_LEAF_IDENTIFIER_STRING ) {
PASS(errctx, akbasic_runtime_evaluate(obj, argleaf, &strval));
PASS(errctx, aksl_strlen(strval->stringval, &length));
out->intval = (int64_t)length;
} else {
PASS(errctx, akbasic_environment_get(obj->environment, argleaf->identifier, &variable));
FAIL_ZERO_RETURN(errctx, (variable != NULL), AKBASIC_ERR_UNDEFINED,
"Identifier %s is undefined", argleaf->identifier);
out->intval = variable->valuecount;
}
*dest = out;
SUCCEED_RETURN(errctx);
}
/* Fetch argument N (zero-based) of a call, already evaluated. */
static akerr_ErrorContext *nth_arg(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, const char *fname, int n, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *arg = NULL;
int i = 0;
FAIL_ZERO_RETURN(errctx, (expr != NULL), AKERR_NULLPOINTER, "NIL leaf");
arg = akbasic_leaf_first_argument(expr);
for ( i = 0; i < n && arg != NULL; i++ ) {
arg = arg->next;
}
FAIL_ZERO_RETURN(errctx, (arg != NULL), AKBASIC_ERR_SYNTAX,
"%s is missing argument %d", fname, n + 1);
PASS(errctx, akbasic_runtime_evaluate(obj, arg, dest));
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_instr(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *haystack = NULL;
akbasic_Value *needle = NULL;
akbasic_Value *out = NULL;
char *hit = NULL;
(void)lval; (void)rval;
PASS(errctx, nth_arg(obj, expr, "INSTR", 0, &haystack));
PASS(errctx, nth_arg(obj, expr, "INSTR", 1, &needle));
FAIL_ZERO_RETURN(errctx,
(haystack->valuetype == AKBASIC_TYPE_STRING &&
needle->valuetype == AKBASIC_TYPE_STRING),
AKBASIC_ERR_TYPE, "INSTR expected two strings");
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_INTEGER;
/* Not finding it is a successful NULL, which is exactly the -1 answer below. */
PASS(errctx, aksl_strstr(haystack->stringval, needle->stringval, &hit));
out->intval = (hit == NULL ? -1 : (int64_t)(hit - haystack->stringval));
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_left(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *source = NULL;
akbasic_Value *count = NULL;
akbasic_Value *out = NULL;
int64_t take = 0;
size_t sourcelen = 0;
(void)lval; (void)rval;
PASS(errctx, nth_arg(obj, expr, "LEFT", 0, &source));
PASS(errctx, nth_arg(obj, expr, "LEFT", 1, &count));
FAIL_NONZERO_RETURN(errctx, (source->valuetype != AKBASIC_TYPE_STRING), AKBASIC_ERR_TYPE,
"LEFT expected a string");
FAIL_NONZERO_RETURN(errctx, (count->valuetype != AKBASIC_TYPE_INTEGER), AKBASIC_ERR_TYPE,
"LEFT expected an integer count");
PASS(errctx, aksl_strlen(source->stringval, &sourcelen));
take = count->intval;
if ( take < 0 ) {
take = 0;
}
if ( (size_t)take > sourcelen ) {
take = (int64_t)sourcelen; /* clamped to LEN, as the README says */
}
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_STRING;
PASS(errctx, aksl_memcpy(out->stringval, source->stringval, (size_t)take));
out->stringval[take] = '\0';
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_right(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *source = NULL;
akbasic_Value *count = NULL;
akbasic_Value *out = NULL;
int64_t take = 0;
size_t sourcelen = 0;
(void)lval; (void)rval;
PASS(errctx, nth_arg(obj, expr, "RIGHT", 0, &source));
PASS(errctx, nth_arg(obj, expr, "RIGHT", 1, &count));
FAIL_NONZERO_RETURN(errctx, (source->valuetype != AKBASIC_TYPE_STRING), AKBASIC_ERR_TYPE,
"RIGHT expected a string");
FAIL_NONZERO_RETURN(errctx, (count->valuetype != AKBASIC_TYPE_INTEGER), AKBASIC_ERR_TYPE,
"RIGHT expected an integer count");
PASS(errctx, aksl_strlen(source->stringval, &sourcelen));
take = count->intval;
if ( take < 0 ) {
take = 0;
}
if ( (size_t)take > sourcelen ) {
take = (int64_t)sourcelen;
}
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_STRING;
PASS(errctx, aksl_memcpy(out->stringval, source->stringval + (sourcelen - (size_t)take),
(size_t)take));
out->stringval[take] = '\0';
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_mid(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *source = NULL;
akbasic_Value *startval = NULL;
akbasic_Value *lengthval = NULL;
akbasic_Value *out = NULL;
int64_t start = 0;
int64_t length = 0;
size_t sourcelen = 0;
(void)lval; (void)rval;
PASS(errctx, nth_arg(obj, expr, "MID", 0, &source));
PASS(errctx, nth_arg(obj, expr, "MID", 1, &startval));
PASS(errctx, nth_arg(obj, expr, "MID", 2, &lengthval));
FAIL_NONZERO_RETURN(errctx, (source->valuetype != AKBASIC_TYPE_STRING), AKBASIC_ERR_TYPE,
"MID expected a string");
FAIL_ZERO_RETURN(errctx,
(startval->valuetype == AKBASIC_TYPE_INTEGER &&
lengthval->valuetype == AKBASIC_TYPE_INTEGER),
AKBASIC_ERR_TYPE, "MID expected integer start and length");
PASS(errctx, aksl_strlen(source->stringval, &sourcelen));
start = startval->intval;
length = lengthval->intval;
FAIL_ZERO_RETURN(errctx, (start >= 0 && (size_t)start <= sourcelen), AKBASIC_ERR_BOUNDS,
"MID start %" PRId64 " is outside 0..%zu", start, sourcelen);
if ( length < 0 ) {
length = 0;
}
if ( (size_t)(start + length) > sourcelen ) {
length = (int64_t)sourcelen - start;
}
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_STRING;
PASS(errctx, aksl_memcpy(out->stringval, source->stringval + start, (size_t)length));
out->stringval[length] = '\0';
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_mod(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *left = NULL;
akbasic_Value *right = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, nth_arg(obj, expr, "MOD", 0, &left));
PASS(errctx, nth_arg(obj, expr, "MOD", 1, &right));
FAIL_ZERO_RETURN(errctx,
(left->valuetype == AKBASIC_TYPE_INTEGER &&
right->valuetype == AKBASIC_TYPE_INTEGER),
AKBASIC_ERR_TYPE, "MOD expected two integers");
FAIL_ZERO_RETURN(errctx, (right->intval != 0), AKBASIC_ERR_VALUE, "DIVISION BY ZERO");
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_INTEGER;
/*
* The reference defines MOD as `X% - (Y% * (X% / Y%))` in BASIC, which with
* truncating integer division is exactly C's %.
*/
out->intval = left->intval - (right->intval * (left->intval / right->intval));
*dest = out;
SUCCEED_RETURN(errctx);
}
/* SHL, SHR and XOR share a shape: two integers in, one integer out. */
static akerr_ErrorContext *two_integers(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, const char *fname, int64_t *a, int64_t *b, akbasic_Value **out)
{
PREPARE_ERROR(errctx);
akbasic_Value *left = NULL;
akbasic_Value *right = NULL;
PASS(errctx, nth_arg(obj, expr, fname, 0, &left));
PASS(errctx, nth_arg(obj, expr, fname, 1, &right));
FAIL_ZERO_RETURN(errctx,
(left->valuetype == AKBASIC_TYPE_INTEGER &&
right->valuetype == AKBASIC_TYPE_INTEGER),
AKBASIC_ERR_TYPE, "%s expected two integers", fname);
*a = left->intval;
*b = right->intval;
PASS(errctx, akbasic_environment_new_value(obj->environment, out));
PASS(errctx, akbasic_value_zero(*out));
(*out)->valuetype = AKBASIC_TYPE_INTEGER;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_shl(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *out = NULL;
int64_t value = 0;
int64_t bits = 0;
(void)lval; (void)rval;
PASS(errctx, two_integers(obj, expr, "SHL", &value, &bits, &out));
FAIL_ZERO_RETURN(errctx, (bits >= 0 && bits < 64), AKBASIC_ERR_VALUE,
"SHL shift count %" PRId64 " is outside 0..63", bits);
out->intval = (int64_t)((uint64_t)value << bits);
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_shr(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *out = NULL;
int64_t value = 0;
int64_t bits = 0;
(void)lval; (void)rval;
PASS(errctx, two_integers(obj, expr, "SHR", &value, &bits, &out));
FAIL_ZERO_RETURN(errctx, (bits >= 0 && bits < 64), AKBASIC_ERR_VALUE,
"SHR shift count %" PRId64 " is outside 0..63", bits);
out->intval = value >> bits;
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_xor(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_Value *out = NULL;
int64_t left = 0;
int64_t right = 0;
(void)lval; (void)rval;
PASS(errctx, two_integers(obj, expr, "XOR", &left, &right, &out));
out->intval = left ^ right;
*dest = out;
SUCCEED_RETURN(errctx);
}
/*
* PEEK, POINTER and POINTERVAR reach real memory. In Go these went through
* unsafe.Pointer; in C they are ordinary casts and are simpler, not harder.
*
* They assume a little-endian host: tests/language/functions/pointer.bas sets
* A# = 255 and expects PEEK(POINTER(A#)) to be 255, which only holds if the low
* byte of the int64_t comes first.
*/
akerr_ErrorContext *akbasic_fn_peek(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *argleaf = NULL;
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
const uint8_t *source = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "PEEK", &argleaf, NULL, NULL));
FAIL_ZERO_RETURN(errctx,
(argleaf->leaftype == AKBASIC_LEAF_LITERAL_INT ||
argleaf->leaftype == AKBASIC_LEAF_IDENTIFIER_INT),
AKBASIC_ERR_TYPE, "PEEK expected INTEGER or INTEGER VARIABLE");
PASS(errctx, akbasic_runtime_evaluate(obj, argleaf, &arg));
FAIL_ZERO_RETURN(errctx, (arg->valuetype == AKBASIC_TYPE_INTEGER && arg->intval != 0),
AKBASIC_ERR_VALUE, "PEEK got NIL pointer or uninitialized variable");
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
source = (const uint8_t *)(uintptr_t)arg->intval;
out->valuetype = AKBASIC_TYPE_INTEGER;
out->intval = (int64_t)(*source);
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_pointer(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *argleaf = NULL;
akbasic_Value *arg = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "POINTER", &argleaf, NULL, NULL));
FAIL_ZERO_RETURN(errctx, akbasic_leaf_is_identifier(argleaf), AKBASIC_ERR_TYPE,
"POINTER expected IDENTIFIER");
/* The address of the live storage, not of a copy of it. */
obj->eval_clone_identifiers = false;
ATTEMPT {
CATCH(errctx, akbasic_runtime_evaluate(obj, argleaf, &arg));
} CLEANUP {
obj->eval_clone_identifiers = true;
} PROCESS(errctx) {
} FINISH(errctx, true);
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_INTEGER;
switch ( arg->valuetype ) {
case AKBASIC_TYPE_INTEGER:
out->intval = (int64_t)(uintptr_t)&arg->intval;
break;
case AKBASIC_TYPE_FLOAT:
out->intval = (int64_t)(uintptr_t)&arg->floatval;
break;
case AKBASIC_TYPE_STRING:
out->intval = (int64_t)(uintptr_t)&arg->stringval;
break;
default:
FAIL_RETURN(errctx, AKBASIC_ERR_TYPE, "POINTER expects a INT, FLOAT or STRING variable");
}
*dest = out;
SUCCEED_RETURN(errctx);
}
akerr_ErrorContext *akbasic_fn_pointervar(akbasic_Runtime *obj, akbasic_ASTLeaf *expr, akbasic_Value *lval, akbasic_Value *rval, akbasic_Value **dest)
{
PREPARE_ERROR(errctx);
akbasic_ASTLeaf *argleaf = NULL;
akbasic_Variable *variable = NULL;
akbasic_Value *out = NULL;
(void)lval; (void)rval;
PASS(errctx, first_arg(obj, expr, "POINTERVAR", &argleaf, NULL, NULL));
FAIL_ZERO_RETURN(errctx, akbasic_leaf_is_identifier(argleaf), AKBASIC_ERR_TYPE,
"POINTERVAR expected IDENTIFIER");
PASS(errctx, akbasic_environment_get(obj->environment, argleaf->identifier, &variable));
FAIL_ZERO_RETURN(errctx, (variable != NULL), AKBASIC_ERR_UNDEFINED,
"Identifier %s is undefined", argleaf->identifier);
PASS(errctx, akbasic_environment_new_value(obj->environment, &out));
PASS(errctx, akbasic_value_zero(out));
out->valuetype = AKBASIC_TYPE_INTEGER;
out->intval = (int64_t)(uintptr_t)variable;
*dest = out;
SUCCEED_RETURN(errctx);
}
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