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/* Windows port for the microcore: stdin/stdout a byte at a time, the syscalls,
diagnostics on stderr. same behaviour as io_win.c plus core.c's hostcall.
1..6 are files, getenv and unix time. 7 exits the process, 8 is a
counter, 9 reports the machine size. */
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <io.h>
#include <process.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "micro_port.h"
#include "bops.h"
#ifndef O_BINARY
#define O_BINARY _O_BINARY
#endif
#if defined(_MSC_VER)
#define open _open
#define close _close
#define read _read
#define write _write
#endif
/* the machine's memory: a block that grows by realloc, zero in the new part. the
base can move on a grow, which micro.c takes into account (it re-reads m). */
static Cell *lmem;
static UCell lcap;
Cell *micro_mem_alloc(UCell words)
{
Cell *n;
if (words <= lcap && lmem) return lmem;
if (words > ((UCell)-1) / sizeof(Cell)) return NULL;
n = realloc(lmem, words * sizeof(Cell));
if (!n) return NULL;
memset(n + lcap, 0, (words - lcap) * sizeof(Cell));
lmem = n;
lcap = words;
return n;
}
int micro_getc(void)
{
int c = _fgetc_nolock(stdin);
return c == EOF ? -1 : c;
}
int micro_eof(void)
{
int c = _fgetc_nolock(stdin);
if (c == EOF) return 1;
_ungetc_nolock(c, stdin);
return 0;
}
void micro_putc(int c) { _fputc_nolock(c & 255, stdout); }
void micro_msg(const char *s) { fputs(s, stderr); }
static int zcstr(Cell *mem, Cell addr, char *dst, int max)
{
int i = 0, c;
if (max < 1) return -1;
if ((UCell)addr >= (UCell)micro_mem_words()) { dst[0] = 0; return -1; }
while (i < max - 1 && (UCell)(addr + i) < (UCell)micro_mem_words()) {
c = (int)mem[addr + i];
if (!c) break;
dst[i++] = (char)c;
}
dst[i] = 0;
return i;
}
static int inmem(Cell a) { return (UCell)a < (UCell)micro_mem_words(); }
/* the command line and the environment, kept for ops 21 to 24: the same
contract as src/core/core.c. a program read from stdin has no file name, so
argv[0] is <eval>. */
static int zy_argc;
static char **zy_argv;
static int zy_envc;
static char **zy_envp;
static void zy_args(int argc, char **argv)
{
char **e = _environ;
int n = 0;
while (e && e[n]) n++;
zy_envp = e; zy_envc = n;
zy_argv = argv;
zy_argc = argc > 0 ? argc : 1;
}
/* copy entry a of a char ** into vm words, one character per word, terminated
like SYS_GETENV. a zero buffer asks for the length only. lead, when given,
replaces entry zero. */
static Cell vecstr(Cell *mem, char **v, int count, Cell a, Cell b, Cell c, const char *lead)
{
char *e;
int i = 0;
if (a < 0 || a >= (Cell)count) return -1;
e = (a == 0 && lead) ? (char *)lead : v[a];
if (!e) return -1;
if (!b) { while (e[i]) i++; return i; }
if (c < 1 || !inmem(b)) return -1;
while (e[i] && i < c - 1 && inmem(b + i)) { mem[b + i] = (unsigned char)e[i]; i++; }
if (inmem(b + i)) mem[b + i] = 0;
return i;
}
static Cell host_rand(void)
{
static uint64_t s;
if (!s) s = (uint64_t)time(0) ^ 0x9E3779B97F4A7C15ull;
if (!s) s = 0x9E3779B97F4A7C15ull;
s ^= s << 13; s ^= s >> 7; s ^= s << 17;
if ((Cell)s == -1) s ^= 0x100;
return (Cell)s;
}
static int memory_words(const char *name, UCell fallback, UCell *words)
{
const char *s = getenv(name);
char *end;
unsigned long long value;
if (!s) { *words = fallback; return 1; }
errno = 0;
value = strtoull(s, &end, 10);
if (errno || end == s || *end || !value || value > 0x7fffffffULL) return 0;
*words = (UCell)value;
return 1;
}
Cell micro_syscall(Cell *mem, Cell op, Cell a, Cell b, Cell c)
{
char path[1024], tmp[512];
int n, i, got;
switch (op) {
case 1:
if (zcstr(mem, a, path, 1024) < 0) return -1;
if (b == 1) return open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
return open(path, O_RDONLY | O_BINARY);
case 2:
return close((int)a);
case 3:
if (c < 0 || !inmem(b)) return -1;
n = 0;
while (n < c) {
i = (int)(c - n);
if (i > 512) i = 512;
if (!inmem(b + n)) break;
if (!inmem(b + n + i - 1)) i = (int)(micro_mem_words() - (b + n));
if (i <= 0) break;
got = (int)read((int)a, tmp, (size_t)i);
if (got <= 0) break;
for (i = 0; i < got; i++) mem[b + n + i] = (unsigned char)tmp[i];
n += got;
}
return n;
case 4:
if (c < 0 || !inmem(b)) return -1;
n = 0;
while (n < c) {
i = (int)(c - n);
if (i > 512) i = 512;
if (!inmem(b + n)) break;
if (!inmem(b + n + i - 1)) i = (int)(micro_mem_words() - (b + n));
if (i <= 0) break;
for (got = 0; got < i; got++) tmp[got] = (char)mem[b + n + got];
got = (int)write((int)a, tmp, (size_t)i);
if (got <= 0) break;
n += got;
}
return n;
case 5: {
char *e;
if (zcstr(mem, a, path, 1024) < 0) return -1;
e = getenv(path);
if (!e) return -1;
if (c < 1 || !inmem(b)) return -1;
i = 0;
while (e[i] && i < c - 1 && inmem(b + i)) { mem[b + i] = (unsigned char)e[i]; i++; }
if (inmem(b + i)) mem[b + i] = 0;
return i;
}
case 6:
return (Cell)time(0);
case 7:
exit((int)a);
case 8:
return host_rand();
case 9:
if (a == 0) return micro_mem_words();
if (a == 1) return HEAP_LO;
if (a == 2) return HEAP_HI;
if (a == 3) return (Cell)micro_mem_words() * 8;
return -1;
case 10:
if (bop_cstr(mem, a, path, 1024, micro_mem_words()) < 0) return -1;
if (b == 1) return open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
return open(path, O_RDONLY | O_BINARY);
case 11:
if (c < 0 || (c > 0 && !bop_ok(b, 1, micro_mem_words()))) return -1;
n = 0;
while (n < c) {
i = (int)(c - n);
if (i > 512) i = 512;
i = bop_span(b + n, i, micro_mem_words());
if (i <= 0) break;
got = (int)read((int)a, tmp, (size_t)i);
if (got <= 0) break;
for (i = 0; i < got; i++) bop_put1(mem, b + n + i, (unsigned char)tmp[i]);
n += got;
}
return n;
case 12:
if (c < 0 || (c > 0 && !bop_ok(b, 1, micro_mem_words()))) return -1;
n = 0;
while (n < c) {
i = (int)(c - n);
if (i > 512) i = 512;
i = bop_span(b + n, i, micro_mem_words());
if (i <= 0) break;
for (got = 0; got < i; got++) tmp[got] = (char)bop_load(mem, b + n + got, 1);
got = (int)write((int)a, tmp, (size_t)i);
if (got <= 0) break;
n += got;
}
return n;
case 13: {
char *e;
if (bop_cstr(mem, a, path, 1024, micro_mem_words()) < 0) return -1;
e = getenv(path);
if (!e) return -1;
if (c < 1 || !bop_ok(b, 1, micro_mem_words())) return -1;
i = 0;
while (e[i] && i < c - 1 && bop_ok(b + i, 1, micro_mem_words())) { bop_put1(mem, b + i, (unsigned char)e[i]); i++; }
if (bop_ok(b + i, 1, micro_mem_words())) bop_put1(mem, b + i, 0);
return i;
}
case 21:
return (Cell)zy_argc;
case 22:
return vecstr(mem, zy_argv, zy_argc, a, b, c, "<eval>");
case 23:
return (Cell)zy_envc;
case 24:
return vecstr(mem, zy_envp, zy_envc, a, b, c, 0);
default:
return -1;
}
}
int main(int argc, char **argv) {
UCell initial, limit;
_setmode(_fileno(stdin), _O_BINARY);
_setmode(_fileno(stdout), _O_BINARY);
zy_args(argc, argv);
if (!memory_words("TINYVM_MEMORY_WORDS", MICRO_MW_INIT, &initial) ||
!memory_words("TINYVM_MAX_MEMORY_WORDS", MICRO_MW_LIMIT, &limit) ||
initial > limit || !micro_memory_config(initial, limit)) {
fputs("micro: invalid memory configuration\n", stderr);
return 1;
}
return micro_run();
}
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