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wasi.c
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#include <fcntl.h>
#include <stdint.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "api.h"
web49_interp_data_t web49_api_import_wasi_fd_seek(web49_interp_t interp) {
int whence = -1;
switch (interp.locals[2].i32_u) {
case 0:
whence = SEEK_CUR;
break;
case 1:
whence = SEEK_END;
break;
case 2:
whence = SEEK_SET;
break;
default:
fprintf(stderr, "bad wasi whence: %" PRIu32 "\n", interp.locals[2].i32_u);
__builtin_trap();
}
if (interp.locals[0].i32_u <= 2 && whence == SEEK_SET) {
WEB49_INTERP_WRITE(int64_t, interp, interp.locals[3].i32_u, interp.locals[1].i64_s);
} else {
WEB49_INTERP_WRITE(int64_t, interp, interp.locals[3].i32_u, (int64_t)lseek(interp.locals[0].i32_u, interp.locals[1].i64_s, whence));
}
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_args_get(web49_interp_t interp) {
uint32_t argv = interp.locals[0].i32_u;
uint32_t buf = interp.locals[1].i32_u;
uint32_t argc = 0;
uint32_t head2 = buf;
for (size_t i = 0; interp.args[i] != NULL; i++) {
WEB49_INTERP_WRITE(uint32_t, interp, argv + argc * 4, head2);
size_t memlen = strlen(interp.args[i]) + 1;
memcpy(WEB49_INTERP_ADDR(void *, interp, head2, memlen), interp.args[i], memlen);
head2 += memlen;
argc += 1;
}
WEB49_INTERP_WRITE(uint32_t, interp, argv + argc * 4, 0);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_args_sizes_get(web49_interp_t interp) {
uint32_t argc = interp.locals[0].i32_u;
uint32_t buf_size = interp.locals[1].i32_u;
uint32_t buf_len = 0;
uint32_t i = 0;
while (interp.args[i] != NULL) {
buf_len += strlen(interp.args[i]) + 1;
i += 1;
}
WEB49_INTERP_WRITE(uint32_t, interp, argc, i);
WEB49_INTERP_WRITE(uint32_t, interp, buf_size, buf_len);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_clock_time_get(web49_interp_t interp) {
uint32_t wasi_clock_id = interp.locals[0].i32_u;
// uint64_t precision = interp.locals[1].i64_u;
uint32_t time = interp.locals[2].i32_u;
clockid_t clock_id;
switch (wasi_clock_id) {
case 0:
clock_id = CLOCK_REALTIME;
break;
case 1:
clock_id = CLOCK_MONOTONIC;
break;
default:
clock_id = (clockid_t)wasi_clock_id;
break;
}
struct timespec ts;
clock_gettime(clock_id, &ts);
WEB49_INTERP_WRITE(uint64_t, interp, time, (uint64_t)ts.tv_sec * 1000000000 + (uint64_t)ts.tv_nsec);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_fd_close(web49_interp_t interp) {
uint32_t fd = interp.locals[0].i32_u;
close(fd);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_fd_fdstat_get(web49_interp_t interp) {
uint32_t fd = interp.locals[0].i32_u;
uint32_t fdstat = interp.locals[1].i32_u;
struct stat fd_stat;
fstat(fd, &fd_stat);
int mode = fd_stat.st_mode;
uint8_t fs_filetype = (S_ISBLK(mode) ? 1 : 0) | (S_ISCHR(mode) ? 2 : 0) | (S_ISDIR(mode) ? 3 : 0) | (S_ISREG(mode) ? 4 : 0);
uint16_t fs_flags = 0;
uint64_t fs_rights_base = UINT64_MAX;
uint64_t fs_rights_inheriting = UINT64_MAX;
if (fd <= 2) {
fs_rights_base &= ~(4 | 32);
}
WEB49_INTERP_WRITE(uint8_t, interp, fdstat + 0, fs_filetype);
WEB49_INTERP_WRITE(uint8_t, interp, fdstat + 1, 0);
WEB49_INTERP_WRITE(uint16_t, interp, fdstat + 2, fs_flags);
WEB49_INTERP_WRITE(uint32_t, interp, fdstat + 4, 0);
WEB49_INTERP_WRITE(uint64_t, interp, fdstat + 8, fs_rights_base);
WEB49_INTERP_WRITE(uint64_t, interp, fdstat + 16, fs_rights_inheriting);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_fd_prestat_get(web49_interp_t interp) {
uint32_t fd = interp.locals[0].i32_u;
uint32_t buf = interp.locals[1].i32_u;
WEB49_INTERP_WRITE(uint8_t, interp, buf, 0);
if (fd == 3) {
WEB49_INTERP_WRITE(uint32_t, interp, buf + 4, 1);
} else if (fd == 4) {
WEB49_INTERP_WRITE(uint32_t, interp, buf + 4, 2);
} else {
return (web49_interp_data_t){.i32_u = 8};
}
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_path_open(web49_interp_t interp) {
uint32_t wdirfd = interp.locals[0].i32_u;
// uint32_t dirflags = interp.locals[1].i32_u;
uint32_t path = interp.locals[2].i32_u;
uint32_t path_len = interp.locals[3].i32_u;
uint32_t oflags = interp.locals[4].i32_u;
uint32_t fs_rights_base = interp.locals[5].i32_u;
// uint32_t fs_rights_inherit = interp.locals[6].i32_u;
uint32_t fs_flags = interp.locals[7].i32_u;
uint32_t pfd = interp.locals[8].i32_u;
char host_path[512];
memcpy(host_path, WEB49_INTERP_ADDR(void *, interp, path, path_len), path_len);
host_path[path_len] = '\0';
if (!strcmp(host_path, "/")) {
WEB49_INTERP_WRITE(int32_t, interp, path, 3);
return (web49_interp_data_t){.i32_u = 0};
} else if (!strcmp(host_path, "./")) {
WEB49_INTERP_WRITE(int32_t, interp, path, 4);
return (web49_interp_data_t){.i32_u = 0};
}
int flags = ((oflags & 1) ? O_CREAT : 0) |
((oflags & 4) ? O_EXCL : 0) |
((oflags & 8) ? O_TRUNC : 0) |
((fs_flags & 1) ? O_APPEND : 0);
if ((fs_rights_base & 2) && (fs_rights_base & 32)) {
flags |= O_RDWR;
} else if (fs_rights_base & 32) {
flags |= O_WRONLY;
} else if (fs_rights_base & 2) {
flags |= O_RDONLY;
}
int dirfd;
switch (wdirfd) {
case 3:
dirfd = open("/", O_RDONLY);
break;
case 4:
dirfd = open("./", O_RDONLY);
break;
default:
fprintf(stderr, "unknown dirfd: %i\n", wdirfd);
__builtin_trap();
}
#if defined(__WIN32__)
int hostfd = open(host_path, flags, 0644);
#else
int hostfd = openat(dirfd, host_path, flags, 0644);
#endif
close(dirfd);
if (hostfd < 0) {
return (web49_interp_data_t){.i32_u = 44};
}
WEB49_INTERP_WRITE(uint32_t, interp, pfd, hostfd);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_fd_read(web49_interp_t interp) {
uint32_t fd = interp.locals[0].i32_u;
uint32_t iovs = interp.locals[1].i32_u;
uint32_t iovs_len = interp.locals[2].i32_u;
uint32_t nread = 0;
for (size_t i = 0; i < iovs_len; i++) {
uint32_t ptr = WEB49_INTERP_READ(uint32_t, interp, iovs + i * 8 + 0);
uint32_t len = WEB49_INTERP_READ(uint32_t, interp, iovs + i * 8 + 4);
nread += (uint32_t)read(fd, WEB49_INTERP_ADDR(void *, interp, ptr, len), len);
}
WEB49_INTERP_WRITE(uint32_t, interp, interp.locals[3].i32_u, nread);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_fd_write(web49_interp_t interp) {
uint32_t fd = interp.locals[0].i32_u;
uint32_t iovs = interp.locals[1].i32_u;
uint32_t iovs_len = interp.locals[2].i32_u;
uint32_t nwritten = 0;
for (size_t i = 0; i < iovs_len; i++) {
uint32_t ptr = WEB49_INTERP_READ(uint32_t, interp, iovs + i * 8 + 0);
uint32_t len = WEB49_INTERP_READ(uint32_t, interp, iovs + i * 8 + 4);
nwritten += (uint32_t)write(fd, WEB49_INTERP_ADDR(void *, interp, ptr, len), len);
}
WEB49_INTERP_WRITE(uint32_t, interp, interp.locals[3].i32_u, nwritten);
return (web49_interp_data_t){.i32_u = 0};
}
web49_interp_data_t web49_api_import_wasi_proc_exit(web49_interp_t interp) {
exit((int)interp.locals[0].i32_u);
}
web49_interp_data_t web49_api_import_wasi_fd_prestat_dir_name(web49_interp_t interp) {
const char *name;
switch (interp.locals[0].i32_u) {
case 3:
name = "/";
break;
case 4:
name = "./";
break;
default:
return (web49_interp_data_t){.i32_u = 9};
}
size_t n = interp.locals[2].i32_u;
uint32_t max_len = strlen(name);
if (n > max_len) {
n = max_len;
}
memcpy(WEB49_INTERP_ADDR(void *, interp, interp.locals[1].i32_u, n), name, n);
return (web49_interp_data_t){.i32_u = 0};
}
web49_env_func_t web49_api_import_wasi(void *wasi, const char *func) {
if (!strcmp(func, "fd_seek")) {
return &web49_api_import_wasi_fd_seek;
} else if (!strcmp(func, "args_get")) {
return &web49_api_import_wasi_args_get;
} else if (!strcmp(func, "args_sizes_get")) {
return &web49_api_import_wasi_args_sizes_get;
} else if (!strcmp(func, "clock_time_get")) {
return &web49_api_import_wasi_clock_time_get;
} else if (!strcmp(func, "fd_close")) {
return &web49_api_import_wasi_fd_close;
} else if (!strcmp(func, "fd_prestat_get")) {
return &web49_api_import_wasi_fd_prestat_get;
} else if (!strcmp(func, "fd_prestat_dir_name")) {
return &web49_api_import_wasi_fd_prestat_dir_name;
} else if (!strcmp(func, "fd_fdstat_get")) {
return &web49_api_import_wasi_fd_fdstat_get;
} else if (!strcmp(func, "path_open")) {
return &web49_api_import_wasi_path_open;
} else if (!strcmp(func, "fd_read")) {
return &web49_api_import_wasi_fd_read;
} else if (!strcmp(func, "fd_write")) {
return &web49_api_import_wasi_fd_write;
} else if (!strcmp(func, "proc_exit")) {
return &web49_api_import_wasi_proc_exit;
} else {
return NULL;
}
}