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#include <fspec/bcode.h>
#include "bcode-internal.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <err.h>
static_assert(sizeof(fspec_off) <= sizeof(((struct fspec_mem*)0)->len), "fspec_off should not be larger than what fspec_mem can represent");
static_assert(sizeof(enum fspec_op) == sizeof(uint8_t), "enum fspec_op is expected to have size of uint8_t");
static_assert(sizeof(enum fspec_arg) == sizeof(uint8_t), "enum fspec_arg is expected to have size of uint8_t");
static fspec_off
arg_data_len(const enum fspec_arg *arg)
{
assert(arg);
switch (*arg) {
case FSPEC_ARG_NUM:
return sizeof(fspec_num);
case FSPEC_ARG_VAR:
return sizeof(fspec_var);
case FSPEC_ARG_STR:
case FSPEC_ARG_OFF:
return sizeof(fspec_off);
case FSPEC_ARG_DAT:
{
struct fspec_mem mem;
fspec_arg_get_mem(arg, NULL, &mem);
return sizeof(fspec_off) + mem.len;
}
case FSPEC_ARG_EOF:
break;
case FSPEC_ARG_LAST:
errx(EXIT_FAILURE, "%s: unexpected argument type %u", __func__, *arg);
break;
}
return 0;
}
static fspec_off
arg_len(const enum fspec_arg *arg)
{
return sizeof(*arg) + arg_data_len(arg);
}
void
fspec_arg_get_mem(const enum fspec_arg *arg, const void *data, struct fspec_mem *out_mem)
{
assert(arg && out_mem);
switch (*arg) {
case FSPEC_ARG_STR:
{
assert(data);
fspec_off off;
fspec_strsz len;
memcpy(&off, (char*)arg + sizeof(*arg), sizeof(off));
memcpy(&len, (char*)data + off, sizeof(len));
out_mem->data = (char*)data + off + sizeof(len);
out_mem->len = len;
}
break;
case FSPEC_ARG_DAT:
{
fspec_off len;
memcpy(&len, (char*)arg + sizeof(*arg), sizeof(len));
out_mem->data = (char*)arg + sizeof(*arg) + sizeof(len);
out_mem->len = len;
}
break;
case FSPEC_ARG_VAR:
case FSPEC_ARG_NUM:
case FSPEC_ARG_OFF:
out_mem->data = (char*)arg + sizeof(*arg);
out_mem->len = arg_data_len(arg);
break;
case FSPEC_ARG_EOF:
*out_mem = (struct fspec_mem){0};
break;
case FSPEC_ARG_LAST:
errx(EXIT_FAILURE, "%s: unexpected argument type %u", __func__, *arg);
break;
}
}
fspec_num
fspec_arg_get_num(const enum fspec_arg *arg)
{
assert(arg);
fspec_num v;
switch (*arg) {
case FSPEC_ARG_NUM:
memcpy(&v, arg + sizeof(*arg), sizeof(v));
break;
case FSPEC_ARG_VAR:
{
fspec_var var;
memcpy(&var, arg + sizeof(*arg), sizeof(var));
v = var;
}
break;
case FSPEC_ARG_DAT:
case FSPEC_ARG_OFF:
{
fspec_off off;
memcpy(&off, arg + sizeof(*arg), sizeof(off));
v = off;
}
break;
case FSPEC_ARG_STR:
case FSPEC_ARG_EOF:
case FSPEC_ARG_LAST:
errx(EXIT_FAILURE, "%s: unexpected argument type %u", __func__, *arg);
break;
}
return v;
}
const char*
fspec_arg_get_cstr(const enum fspec_arg *arg, const void *data)
{
assert(arg && *arg == FSPEC_ARG_STR);
struct fspec_mem mem;
fspec_arg_get_mem(arg, data, &mem);
return (const char*)mem.data;
}
const enum fspec_arg*
fspec_op_get_arg(const enum fspec_op *start, const void *end, const uint8_t nth, const uint32_t expect)
{
uint8_t i = 0;
const enum fspec_arg *arg = NULL;
for (const enum fspec_op *op = fspec_op_next(start, end, false); op && i < nth; op = fspec_op_next(op, end, false)) {
if (*op != FSPEC_OP_ARG)
return NULL;
arg = (void*)(op + 1);
assert(*arg >= 0 && *arg < FSPEC_ARG_LAST);
++i;
}
if (arg && !(expect & (1<<*arg)))
errx(EXIT_FAILURE, "got unexpected argument of type %u", *arg);
return arg;
}
const enum fspec_arg*
fspec_arg_next(const enum fspec_arg *arg, const void *end, const uint8_t nth, const uint32_t expect)
{
return fspec_op_get_arg((void*)(arg - 1), end, nth, expect);
}
const enum fspec_op*
fspec_op_next(const enum fspec_op *start, const void *end, const bool skip_args)
{
assert(start && end);
fspec_off off = sizeof(*start);
if ((void*)start < end && *start == FSPEC_OP_ARG)
off += arg_len((void*)(start + 1));
for (const enum fspec_op *op = start + off; (void*)start < end && (void*)op < end; ++op) {
if (*op >= FSPEC_OP_LAST)
errx(EXIT_FAILURE, "got unexected opcode %u", *op);
if (skip_args && *op == FSPEC_OP_ARG) {
op += arg_len((void*)(op + 1));
continue;
}
return op;
}
return NULL;
}
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