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/*
* nanowasm, a tiny WebAssembly/Wasm interpreter
* Copyright (C) 2023-2024 Xavier Del Campo Romero
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <nanowasm/nw.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int io_read(void *const buf, const size_t n, void *const user)
{
FILE *const f = user;
const size_t r = fread(buf, 1, 1, f);
if (!r && ferror(f))
{
fprintf(stderr, "%s: ferror\n", __func__);
return -1;
}
return r;
}
static enum nw_state io_seek(const long offset, const enum nw_whence whence,
void *const user)
{
static const int trans[] =
{
[NW_SEEK_END] = SEEK_END,
[NW_SEEK_CUR] = SEEK_CUR,
[NW_SEEK_SET] = SEEK_SET
};
if (fseek(user, offset, trans[whence]))
{
fprintf(stderr, "%s: fseek(3): %s\n", __func__, strerror(errno));
return NW_FATAL;
}
return NW_OK;
}
static enum nw_state io_tell(long *const out, void *const user)
{
const long offset = ftell(user);
if (offset < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return NW_FATAL;
}
*out = offset;
return NW_OK;
}
static int io_eof(void *const user)
{
FILE *const f = user;
return feof(f);
}
int main(int argc, char *argv[])
{
int ret = EXIT_FAILURE;
FILE *f = NULL;
if (argc != 2)
{
fprintf(stderr, "%s <wasm>\n", *argv);
goto end;
}
const char *const path = argv[1];
if (!(f = fopen(path, "rb")))
{
fprintf(stderr, "%s: fopen(3) %s: %s\n", __func__, path,
strerror(errno));
goto end;
}
static const struct nw_import imports[] =
{
{
.kind = NW_KIND_FUNCTION,
.module = "wasi_snapshot_preview1",
.field = "proc_exit"
}
};
const struct nw_io_cfg io =
{
.read = io_read,
.seek = io_seek,
.tell = io_tell,
.eof = io_eof,
.user = f
};
const struct nw_mod_cfg cfg =
{
.imports = imports,
.n_imports = sizeof imports / sizeof *imports,
.io = io
};
struct nw_mod m;
nw_init(&m, &cfg);
again:
switch (nw_load(&m))
{
case NW_OK:
break;
case NW_AGAIN:
goto again;
case NW_FATAL:
fprintf(stderr, "%s: nw_load failed\n", __func__);
goto end;
}
const struct nw_inst_cfg icfg =
{
.interp_cfg =
{
.global = NW_BUF(1),
.heap = NW_BUF(1),
.stack = NW_BUF(128),
.io = io,
.m = &m
}
};
struct nw_inst inst;
if (nw_start(&icfg, &inst))
{
fprintf(stderr, "%s: nw_start failed\n", __func__);
goto end;
}
again2:
switch (nw_run(&inst))
{
case NW_OK:
break;
case NW_AGAIN:
goto again2;
case NW_FATAL:
fprintf(stderr, "%s: nw_run failed: %s\n", __func__,
nw_exception(&inst));
goto end;
}
ret = EXIT_SUCCESS;
end:
if (f && fclose(f))
{
fprintf(stderr, "%s: fclose(3) %s: %s\n", __func__, path,
strerror(errno));
goto end;
}
return ret;
}
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