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urbit/g/m.c
C. Guy Yarvin dbe046620a Move loobeans from u3 to c3.
2014-11-04 17:18:47 -08:00

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/* g/m.c
**
** This file is in the public domain.
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <sigsegv.h>
#include "all.h"
static jmp_buf u3_Signal;
#ifndef SIGSTKSZ
# define SIGSTKSZ 16384
#endif
static uint8_t Sigstk[SIGSTKSZ];
void u3_unix_ef_hold(void); // suspend system signal regime
void u3_unix_ef_move(void); // restore system signal regime
extern void
u3_lo_sway(c3_l tab_l, u3_noun tax);
#if 0
/* _cm_punt(): crudely print trace.
*/
static void
_cm_punt(u3_noun tax)
{
u3_noun xat;
for ( xat = tax; xat; xat = u3t(xat) ) {
u3_cm_p("&", u3h(xat));
}
}
#endif
/* _cm_emergency(): write emergency text to stderr, never failing.
*/
static void
_cm_emergency(c3_c* cap_c, c3_l sig_l)
{
write(2, "\r\n", 2);
write(2, cap_c, strlen(cap_c));
if ( sig_l ) {
write(2, ": ", 2);
write(2, &sig_l, 4);
}
write(2, "\r\n", 2);
}
static void _cm_overflow(void *arg1, void *arg2, void *arg3)
{
(void)(arg1);
(void)(arg2);
(void)(arg3);
siglongjmp(u3_Signal, c3__over);
}
/* _cm_signal_handle(): handle a signal in general.
*/
static void
_cm_signal_handle(c3_l sig_l)
{
if ( c3__over == sig_l ) {
sigsegv_leave_handler(_cm_overflow, NULL, NULL, NULL);
}
else {
siglongjmp(u3_Signal, sig_l);
}
}
static void
_cm_signal_handle_over(int emergency, stackoverflow_context_t scp)
{
_cm_signal_handle(c3__over);
}
static void
_cm_signal_handle_term(int x)
{
// Ignore if we are using base memory from work memory, very rare.
//
if ( (0 != u3H->rod_u.kid_u) && (&(u3H->rod_u) == u3R) ) {
_cm_emergency("ignored", c3__term);
}
else {
_cm_signal_handle(c3__term);
}
}
static void
_cm_signal_handle_intr(int x)
{
// Interrupt: stop work. Ignore if not working, or (rarely) using base.
//
if ( &(u3H->rod_u) == u3R ) {
_cm_emergency("ignored", c3__intr);
}
else {
_cm_signal_handle(c3__intr);
}
}
static void
_cm_signal_handle_alrm(int x)
{
_cm_signal_handle(c3__alrm);
}
/* _cm_signal_reset(): reset top road after signal longjmp.
*/
static void
_cm_signal_reset(void)
{
u3R = &u3H->rod_u;
u3R->cap_p = u3R->mat_p;
u3R->ear_p = 0;
u3R->kid_u = 0;
}
/* _cm_signal_recover(): recover from a deep signal, after longjmp. Free arg.
*/
static u3_noun
_cm_signal_recover(c3_l sig_l, u3_noun arg)
{
u3_noun tax;
// Unlikely to be set, but it can be made to happen.
//
tax = u3H->rod_u.bug.tax;
u3H->rod_u.bug.tax = 0;
if ( &(u3H->rod_u) == u3R ) {
// A top-level crash - rather odd. We should GC.
//
_cm_emergency("recover: top", sig_l);
u3H->rod_u.how.fag_w |= u3_cs_flag_gc;
// Reset the top road - the problem could be a fat cap.
//
_cm_signal_reset();
if ( (c3__meme == sig_l) && (u3_ca_open(u3R) <= 256) ) {
// Out of memory at the top level. Error becomes c3__full,
// and we release the emergency buffer. To continue work,
// we need to readjust the image, eg, migrate to 64 bit.
//
u3z(u3R->bug.mer);
u3R->bug.mer = 0;
sig_l = c3__full;
}
return u3nt(3, sig_l, tax);
}
else {
u3_noun pro;
// A signal was generated while we were within Nock.
//
_cm_emergency("recover: dig", sig_l);
// Descend to the innermost trace, collecting stack.
//
{
u3_cs_road* rod_u;
u3R = &(u3H->rod_u);
rod_u = u3R;
while ( rod_u->kid_u ) {
tax = u3_ckb_weld(u3_ca_take(rod_u->kid_u->bug.tax), tax);
rod_u = rod_u->kid_u;
}
}
pro = u3nt(3, sig_l, tax);
_cm_signal_reset();
u3z(arg);
return pro;
}
}
/* _cm_signal_deep(): start deep processing; set timer for sec_w or 0.
*/
static void
_cm_signal_deep(c3_w sec_w)
{
u3_unix_ef_hold();
stackoverflow_install_handler(_cm_signal_handle_over, Sigstk, SIGSTKSZ);
signal(SIGINT, _cm_signal_handle_intr);
signal(SIGTERM, _cm_signal_handle_term);
// Provide a little emergency memory, for use in case things
// go utterly haywire.
//
if ( 0 == u3H->rod_u.bug.mer ) {
u3H->rod_u.bug.mer = u3_ci_string("emergency buffer");
}
if ( sec_w ) {
struct itimerval itm_u;
timerclear(&itm_u.it_interval);
itm_u.it_value.tv_sec = sec_w;
itm_u.it_value.tv_usec = 0;
setitimer(ITIMER_VIRTUAL, &itm_u, 0);
signal(SIGVTALRM, _cm_signal_handle_alrm);
}
}
/* _cm_signal_done():
*/
static void
_cm_signal_done()
{
// signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGVTALRM, SIG_IGN);
stackoverflow_deinstall_handler();
{
struct itimerval itm_u;
timerclear(&itm_u.it_interval);
timerclear(&itm_u.it_value);
setitimer(ITIMER_VIRTUAL, &itm_u, 0);
}
u3_unix_ef_move();
}
/* u3_cm_signal(): treat a nock-level exception as a signal interrupt.
*/
void
u3_cm_signal(u3_noun sig_l)
{
siglongjmp(u3_Signal, sig_l);
}
/* u3_cm_file(): load file, as atom, or bail.
*/
u3_noun
u3_cm_file(c3_c* pas_c)
{
struct stat buf_b;
c3_i fid_i = open(pas_c, O_RDONLY, 0644);
c3_w fln_w, red_w;
c3_y* pad_y;
if ( (fid_i < 0) || (fstat(fid_i, &buf_b) < 0) ) {
fprintf(stderr, "%s: %s\r\n", pas_c, strerror(errno));
return u3_cm_bail(c3__fail);
}
fln_w = buf_b.st_size;
pad_y = c3_malloc(buf_b.st_size);
red_w = read(fid_i, pad_y, fln_w);
close(fid_i);
if ( fln_w != red_w ) {
free(pad_y);
return u3_cm_bail(c3__fail);
}
else {
u3_noun pad = u3_ci_bytes(fln_w, (c3_y *)pad_y);
free(pad_y);
return pad;
}
}
/* _find_north(): in restored image, point to a north home.
*/
static u3_road*
_find_north(c3_w* mem_w, c3_w siz_w, c3_w len_w)
{
return (void *) ((mem_w + len_w) - siz_w);
}
#if 0
/* _find_south(): in restored image, point to a south home.
*/
static u3_road*
_find_south(c3_w* mem_w, c3_w siz_w, c3_w len_w)
{
return (void *)mem_w;
}
#endif
static u3_road*
_boot_north(c3_w* mem_w, c3_w siz_w, c3_w len_w)
{
c3_w* rut_w = mem_w;
c3_w* hat_w = rut_w;
c3_w* mat_w = ((mem_w + len_w) - siz_w);
c3_w* cap_w = mat_w;
u3_road* rod_u = (void*) mat_w;
// memset(mem_w, 0, 4 * len_w); // enable in case of corruption
memset(rod_u, 0, 4 * siz_w);
rod_u->rut_p = u3of(c3_w, rut_w);
rod_u->hat_p = u3of(c3_w, hat_w);
rod_u->mat_p = u3of(c3_w, mat_w);
rod_u->cap_p = u3of(c3_w, cap_w);
return rod_u;
}
/* _boot_south(): install a south road.
*/
static u3_road*
_boot_south(c3_w* mem_w, c3_w siz_w, c3_w len_w)
{
c3_w* rut_w = (mem_w + len_w);
c3_w* hat_w = rut_w;
c3_w* mat_w = mem_w;
c3_w* cap_w = mat_w + siz_w;
u3_road* rod_u = (void*) mat_w;
// memset(mem_w, 0, 4 * len_w); // enable in case of corruption
memset(rod_u, 0, 4 * siz_w);
rod_u->rut_p = u3of(c3_w, rut_w);
rod_u->hat_p = u3of(c3_w, hat_w);
rod_u->mat_p = u3of(c3_w, mat_w);
rod_u->cap_p = u3of(c3_w, cap_w);
return rod_u;
}
/* _boot_parts(): build internal tables.
*/
static void
_boot_parts(void)
{
u3R->cax.har_p = u3_ch_new();
u3R->jed.har_p = u3_ch_new();
u3R->jed.das = u3nc(u3_nul, u3_nul);
}
/* u3_cm_mark(): mark all nouns in the road.
*/
void
u3_cm_mark(void)
{
u3_ch_mark(u3R->jed.har_p);
u3_ca_mark_noun(u3R->jed.das);
u3_ca_mark_noun(u3R->ski.flu);
u3_ca_mark_noun(u3R->bug.tax);
u3_ca_mark_noun(u3R->bug.mer);
u3_ca_mark_noun(u3R->pro.don);
u3_ca_mark_noun(u3R->pro.day);
u3_ch_mark(u3R->cax.har_p);
}
/* u3_cm_boot(): instantiate or activate image.
*/
void
u3_cm_boot(c3_o nuu_o, c3_o bug_o)
{
if ( c3y == nuu_o ) {
u3H = (void *)_boot_north(u3_Loom + 1,
c3_wiseof(u3_cs_home),
u3_cc_words - 1);
u3R = &u3H->rod_u;
_boot_parts();
}
else {
u3H = (void *)_find_north(u3_Loom + 1,
c3_wiseof(u3_cs_home),
u3_cc_words - 1);
u3R = &u3H->rod_u;
}
if ( _(bug_o) ) {
u3R->how.fag_w |= u3_cs_flag_debug;
}
}
/* u3_cm_clear(): clear all allocated data in road.
*/
void
u3_cm_clear(void)
{
u3_ch_free(u3R->cax.har_p);
u3_ch_free(u3R->jed.har_p);
u3_ca_lose(u3R->jed.das);
}
#if 0
void
u3_cm_dump(void)
{
c3_w hat_w;
c3_w fre_w = 0;
c3_w i_w;
hat_w = _(u3_ca_is_north(u3R)) ? u3R->hat_w - u3R->rut_w
: u3R->rut_w - u3R->hat_w;
for ( i_w = 0; i_w < u3_cc_fbox_no; i_w++ ) {
u3_cs_fbox* fre_u = u3R->all.fre_u[i_w];
while ( fre_u ) {
fre_w += fre_u->box_u.siz_w;
fre_u = fre_u->nex_u;
}
}
fprintf(stderr, "dump: hat_w %x, fre_w %x, allocated %x\n",
hat_w, fre_w, (hat_w - fre_w));
if ( 0 != (hat_w - fre_w) ) {
c3_w* box_w = _(u3_ca_is_north(u3R)) ? u3R->rut_w : u3R->hat_w;
c3_w mem_w = 0;
while ( box_w < (_(u3_ca_is_north(u3R)) ? u3R->hat_w : u3R->rut_w) ) {
u3_cs_box* box_u = (void *)box_w;
if ( 0 != box_u->use_w ) {
#ifdef U3_MEMORY_DEBUG
// printf("live %d words, code %x\n", box_u->siz_w, box_u->cod_w);
#endif
mem_w += box_u->siz_w;
}
box_w += box_u->siz_w;
}
fprintf(stderr, "second count: %x\n", mem_w);
}
}
#endif
c3_w Exit;
/* u3_cm_bail(): bail out. Does not return.
**
** Bail motes:
**
** %evil :: erroneous cryptography
** %exit :: semantic failure
** %oops :: assertion failure
** %intr :: interrupt
** %fail :: computability failure
** %over :: stack overflow (a kind of %fail)
** %need :: namespace block
** %meme :: out of memory
**
** These are equivalents of the full exception noun, the error ball:
**
** $% [%0 success]
** [%1 paths]
** [%2 trace]
** [%3 code trace]
** ==
*/
c3_i
u3_cm_bail(u3_noun how)
{
if ( (c3__exit == how) && (u3R == &u3H->rod_u) ) {
abort();
}
if ( c3__fail == how ) {
abort();
}
if ( c3__foul == how ) {
abort();
}
/* Printf some metadata.
*/
if ( c3__exit != how ) {
if ( _(u3ud(how)) ) {
c3_c str_c[5];
str_c[0] = ((how >> 0) & 0xff);
str_c[1] = ((how >> 8) & 0xff);
str_c[2] = ((how >> 16) & 0xff);
str_c[3] = ((how >> 24) & 0xff);
str_c[4] = 0;
fprintf(stderr, "bail: %s\r\n", str_c);
}
else {
c3_assert(_(u3ud(u3h(how))));
fprintf(stderr, "bail: %d\r\n", u3h(how));
u3_cm_p("bail", u3t(how));
}
}
if ( c3__oops == how ) {
abort();
}
if ( &(u3H->rod_u) == u3R ) {
// For top-level errors, which shouln't happen often, we have no
// choice but to use the signal process; and we require the flat
// form of how.
//
c3_assert(_(u3_ca_is_cat(how)));
u3_cm_signal(how);
}
/* Reconstruct a correct error ball.
*/
{
if ( _(u3ud(how)) ) {
switch ( how ) {
case c3__exit: {
how = u3nc(2, u3R->bug.tax);
break;
}
case c3__need: {
c3_assert(0);
}
default: {
how = u3nt(3, how, u3R->bug.tax);
break;
}
}
}
}
/* Longjmp, with an underscore.
*/
_longjmp(u3R->esc.buf, how);
return 0;
}
int c3_cooked() { return u3_cm_bail(c3__oops); }
/* u3_cm_error(): bail out with %exit, ct_pushing error.
*/
c3_i
u3_cm_error(c3_c* str_c)
{
fprintf(stderr, "error: %s\r\n", str_c); // rong
return u3_cm_bail(c3__exit);
}
/* u3_cm_leap(): in u3R, create a new road within the existing one.
*/
void
u3_cm_leap(c3_w pad_w)
{
c3_w len_w;
u3_road* rod_u;
/* Measure the pad - we'll need it.
*/
{
if ( pad_w < u3R->all.fre_w ) {
pad_w = 0;
}
else {
pad_w -= u3R->all.fre_w;
}
if ( (pad_w + c3_wiseof(u3_cs_road)) >= u3_ca_open(u3R) ) {
u3_cm_bail(c3__meme);
}
len_w = u3_ca_open(u3R) - (pad_w + c3_wiseof(u3_cs_road));
}
/* Allocate a region on the cap.
*/
{
u3p(c3_w) bot_p;
if ( c3y == u3_ca_is_north(u3R) ) {
bot_p = (u3R->cap_p - len_w);
u3R->cap_p -= len_w;
rod_u = _boot_south(u3_ca_into(bot_p), c3_wiseof(u3_cs_road), len_w);
#if 0
fprintf(stderr, "leap: from north %p (cap %x), to south %p\r\n",
u3R,
u3R->cap_p + len_p,
rod_u);
#endif
}
else {
bot_p = u3R->cap_p;
u3R->cap_p += len_w;
rod_u = _boot_north(u3_ca_into(bot_p), c3_wiseof(u3_cs_road), len_w);
#if 0
fprintf(stderr, "leap: from north %p (cap %p), to south %p\r\n",
u3R,
u3R->cap_p - len_p,
rod_u);
#endif
}
}
/* Attach the new road to its parents.
*/
{
c3_assert(0 == u3R->kid_u);
rod_u->par_u = u3R;
u3R->kid_u = rod_u;
}
/* Set up the new road.
*/
{
if ( u3R->how.fag_w & u3_cs_flag_debug ) {
rod_u->how.fag_w |= u3_cs_flag_debug;
}
u3R = rod_u;
_boot_parts();
}
}
/* u3_cm_fall(): in u3R, return an inner road to its parent.
*/
void
u3_cm_fall()
{
c3_assert(0 != u3R->par_u);
#if 0
fprintf(stderr, "fall: from %s %p, to %s %p (cap %p, was %p)\r\n",
_(u3_ca_is_north(u3R)) ? "north" : "south",
u3R,
_(u3_ca_is_north(u3R)) ? "north" : "south",
u3R->par_u,
u3R->hat_w,
u3R->rut_w);
#endif
/* The new cap is the old hat - it's as simple as that.
*/
u3R->par_u->cap_p = u3R->hat_p;
/* And, we're back home.
*/
u3R = u3R->par_u;
u3R->kid_u = 0;
}
/* u3_cm_hate(): new, integrated leap mechanism (enter).
*/
void
u3_cm_hate(c3_w pad_w)
{
c3_assert(0 == u3R->ear_p);
u3R->ear_p = u3R->cap_p;
u3_cm_leap(pad_w);
}
/* u3_cm_love(): return product from leap.
*/
u3_noun
u3_cm_love(u3_noun pro)
{
u3_noun das = u3R->jed.das;
u3p(u3_ch_root) har_p = u3R->jed.har_p;
u3_cm_fall();
pro = u3_ca_take(pro);
u3_cj_reap(das, har_p);
u3R->cap_p = u3R->ear_p;
u3R->ear_p = 0;
return pro;
}
/* u3_cm_golf(): record cap_p length for u3_flog().
*/
c3_w
u3_cm_golf(void)
{
if ( c3y == u3_ca_is_north(u3R) ) {
return u3R->mat_p - u3R->cap_p;
}
else {
return u3R->cap_p - u3R->mat_p;
}
}
/* u3_cm_flog(): reset cap_p.
*/
void
u3_cm_flog(c3_w gof_w)
{
// Enable memsets in case of memory corruption.
//
if ( c3y == u3_ca_is_north(u3R) ) {
u3_post bot_p = (u3R->mat_p - gof_w);
// c3_w len_w = (bot_w - u3R->cap_w);
// memset(u3R->cap_w, 0, 4 * len_w);
u3R->cap_p = bot_p;
}
else {
u3_post bot_p = u3R->mat_p + gof_w;
// c3_w len_w = (u3R->cap_w - bot_w);
// memset(bot_w, 0, 4 * len_w); //
u3R->cap_p = bot_p;
}
}
/* u3_cm_water(): produce watermarks.
*/
void
u3_cm_water(c3_w* low_w, c3_w* hig_w)
{
c3_assert(u3R == &u3H->rod_u);
*low_w = (u3H->rod_u.hat_p - u3H->rod_u.rut_p);
*hig_w = (u3H->rod_u.mat_p - u3H->rod_u.cap_p) + c3_wiseof(u3_cs_home);
}
/* u3_cm_soft_top(): top-level safety wrapper.
*/
u3_noun
u3_cm_soft_top(c3_w sec_w, // timer seconds
c3_w pad_w, // base memory pad
u3_funk fun_f,
u3_noun arg)
{
u3_noun why, pro;
c3_l sig_l;
/* Enter internal signal regime.
*/
_cm_signal_deep(0);
if ( 0 != (sig_l = sigsetjmp(u3_Signal, 1)) ) {
// return to blank state
//
_cm_signal_done();
// recover memory state from the top down
//
return _cm_signal_recover(sig_l, arg);
}
/* Record the cap, and leap.
*/
u3_cm_hate(pad_w);
/* Trap for ordinary nock exceptions.
*/
if ( 0 == (why = u3_cm_trap()) ) {
pro = fun_f(arg);
/* Make sure the inner routine did not create garbage.
*/
if ( u3R->how.fag_w & u3_cs_flag_debug ) {
u3_ce_grab("top", pro, c3nne);
}
/* Revert to external signal regime.
*/
_cm_signal_done();
/* Produce success, on the old road.
*/
pro = u3nc(0, u3_cm_love(pro));
}
else {
/* Overload the error result.
*/
pro = u3_cm_love(why);
}
/* Revert to external signal regime.
*/
_cm_signal_done();
/* Free the argument.
*/
u3z(arg);
/* Return the product.
*/
return pro;
}
/* u3_cm_soft_sure(): top-level call assumed correct.
*/
u3_noun
u3_cm_soft_sure(u3_funk fun_f, u3_noun arg)
{
u3_noun pro, pru = u3_cm_soft_top(0, 32768, fun_f, arg);
c3_assert(_(u3du(pru)));
pro = u3k(u3t(pru));
u3z(pru);
return pro;
}
/* u3_cm_soft_slam: top-level call.
*/
u3_noun _cm_slam(u3_noun arg) { return u3_cn_slam_on(u3h(arg), u3t(arg)); }
u3_noun
u3_cm_soft_slam(u3_noun gat, u3_noun sam)
{
return u3_cm_soft_sure(_cm_slam, u3nc(gat, sam));
}
/* u3_cm_soft_run(): descend into virtualization context.
*/
u3_noun
u3_cm_soft_run(u3_noun fly,
u3_funq fun_f,
u3_noun aga,
u3_noun agb)
{
u3_noun why, pro;
/* Record the cap, and leap.
*/
u3_cm_hate(32768);
/* Configure the new road.
*/
{
u3R->ski.flu = u3nc(fly, u3R->par_u->ski.flu);
u3R->pro.don = u3R->par_u->pro.don;
u3R->bug.tax = 0;
}
/* Trap for exceptions.
*/
if ( 0 == (why = u3_cm_trap()) ) {
pro = fun_f(aga, agb);
if ( u3R->how.fag_w & u3_cs_flag_debug ) {
u3_ce_grab("top", pro, c3nne);
}
/* Produce success, on the old road.
*/
pro = u3nc(0, u3_cm_love(pro));
}
else {
/* Produce - or fall again.
*/
{
c3_assert(_(u3du(why)));
switch ( u3h(why) ) {
default: c3_assert(0); return 0;
case 0: { // unusual: bail with success.
pro = u3_cm_love(why);
} break;
case 1: { // blocking request
pro = u3_cm_love(why);
} break;
case 2: { // true exit
pro = u3_cm_love(why);
} break;
case 3: { // failure; rebail w/trace
u3_noun yod = u3_cm_love(u3t(why));
u3_cm_bail
(u3nt(3,
u3_ca_take(u3h(yod)),
u3_ckb_weld(u3t(yod), u3k(u3R->bug.tax))));
} break;
case 4: { // meta-bail
u3_cm_bail(u3_cm_love(u3t(why)));
} break;
}
}
}
/* Release the arguments.
*/
{
u3z(fly);
u3z(aga);
u3z(agb);
}
/* Return the product.
*/
return pro;
}
/* u3_cm_soft_esc(): namespace lookup. Produces direct result.
*/
u3_noun
u3_cm_soft_esc(u3_noun sam)
{
u3_noun why, fly, pro;
/* Assert preconditions.
*/
{
c3_assert(0 != u3R->ski.flu);
fly = u3h(u3R->ski.flu);
}
/* Record the cap, and leap.
*/
u3_cm_hate(32768);
/* Configure the new road.
*/
{
u3R->ski.flu = u3t(u3R->par_u->ski.flu);
u3R->pro.don = u3R->par_u->pro.don;
u3R->bug.tax = 0;
}
/* Trap for exceptions.
*/
if ( 0 == (why = u3_cm_trap()) ) {
pro = u3_cn_slam_on(fly, sam);
/* Fall back to the old road, leaving temporary memory intact.
*/
pro = u3_cm_love(pro);
}
else {
/* Push the error back up to the calling context - not the run we
** are in, but the caller of the run, matching pure nock semantics.
*/
u3_cm_bail(u3nc(4, u3_cm_love(why)));
}
/* Release the sample.
*/
u3z(sam);
/* Return the product.
*/
return pro;
}
/* u3_cm_soft(): top-level wrapper.
**
** Produces [0 product] or [%error (list tank)], top last.
*/
u3_noun
u3_cm_soft(c3_w sec_w,
u3_funk fun_f,
u3_noun arg)
{
u3_noun why;
why = u3_cm_soft_top(sec_w, (1 << 17), fun_f, arg); // 512K pad
if ( 0 == u3h(why) ) {
return why;
} else {
u3_noun tax, cod, pro, mok;
c3_assert(1 != u3h(why)); // don't use .^ at the top level!
if ( 2 == u3h(why) ) {
cod = c3__exit;
tax = u3k(u3t(why));
}
else {
c3_assert(3 == u3h(why));
cod = u3k(u3h(u3t(why)));
tax = u3k(u3t(u3t(why)));
}
mok = u3_dc("mook", 2, tax);
pro = u3nc(cod, u3k(u3t(mok)));
u3z(mok);
u3z(why);
return pro;
}
}
/* _cm_is_tas(): yes iff som (RETAIN) is @tas.
*/
static c3_o
_cm_is_tas(u3_atom som, c3_w len_w)
{
c3_w i_w;
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_c c_c = u3_cr_byte(i_w, som);
if ( islower(c_c) ||
(isdigit(c_c) && (0 != i_w) && ((len_w - 1) != i_w))
|| '-' == c_c )
{
continue;
}
return c3n;
}
return c3y;
}
/* _cm_is_ta(): yes iff som (RETAIN) is @ta.
*/
static c3_o
_cm_is_ta(u3_noun som, c3_w len_w)
{
c3_w i_w;
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_c c_c = u3_cr_byte(i_w, som);
if ( (c_c < 32) || (c_c > 127) ) {
return c3n;
}
}
return c3y;
}
/* _cm_hex(): hex byte.
*/
c3_y _cm_hex(c3_y c_y)
{
if ( c_y < 10 )
return '0' + c_y;
else return 'a' + (c_y - 10);
}
/* _cm_in_pretty: measure/cut prettyprint.
*/
static c3_w
_cm_in_pretty(u3_noun som, c3_o sel_o, c3_c* str_c)
{
if ( _(u3du(som)) ) {
c3_w sel_w, one_w, two_w;
sel_w = 0;
if ( _(sel_o) ) {
if ( str_c ) { *(str_c++) = '['; }
sel_w += 1;
}
one_w = _cm_in_pretty(u3h(som), c3y, str_c);
if ( str_c ) {
str_c += one_w;
*(str_c++) = ' ';
}
two_w = _cm_in_pretty(u3t(som), c3n, str_c);
if ( str_c ) { str_c += two_w; }
if ( _(sel_o) ) {
if ( str_c ) { *(str_c++) = ']'; }
sel_w += 1;
}
return one_w + two_w + 1 + sel_w;
}
else {
if ( som < 65536 ) {
c3_c buf_c[6];
c3_w len_w;
snprintf(buf_c, 6, "%d", som);
len_w = strlen(buf_c);
if ( str_c ) { strcpy(str_c, buf_c); str_c += len_w; }
return len_w;
}
else {
c3_w len_w = u3_cr_met(3, som);
if ( _(_cm_is_tas(som, len_w)) ) {
c3_w len_w = u3_cr_met(3, som);
if ( str_c ) {
*(str_c++) = '%';
u3_cr_bytes(0, len_w, (c3_y *)str_c, som);
str_c += len_w;
}
return len_w + 1;
}
else if ( _(_cm_is_ta(som, len_w)) ) {
if ( str_c ) {
*(str_c++) = '\'';
u3_cr_bytes(0, len_w, (c3_y *)str_c, som);
str_c += len_w;
*(str_c++) = '\'';
}
return len_w + 2;
}
else {
c3_w len_w = u3_cr_met(3, som);
c3_c *buf_c = malloc(2 + (2 * len_w) + 1);
c3_w i_w = 0;
c3_w a_w = 0;
buf_c[a_w++] = '0';
buf_c[a_w++] = 'x';
for ( i_w = 0; i_w < len_w; i_w++ ) {
c3_y c_y = u3_cr_byte(len_w - (i_w + 1), som);
if ( (i_w == 0) && (c_y <= 0xf) ) {
buf_c[a_w++] = _cm_hex(c_y);
} else {
buf_c[a_w++] = _cm_hex(c_y >> 4);
buf_c[a_w++] = _cm_hex(c_y & 0xf);
}
}
buf_c[a_w] = 0;
len_w = a_w;
if ( str_c ) { strcpy(str_c, buf_c); str_c += len_w; }
free(buf_c);
return len_w;
}
}
}
}
/* u3_cm_pretty(): dumb prettyprint to string.
*/
c3_c*
u3_cm_pretty(u3_noun som)
{
c3_w len_w = _cm_in_pretty(som, c3y, 0);
c3_c* pre_c = malloc(len_w + 1);
_cm_in_pretty(som, c3y, pre_c);
pre_c[len_w] = 0;
return pre_c;
}
/* u3_cm_p(): dumb print with caption.
*/
void
u3_cm_p(const c3_c* cap_c, u3_noun som)
{
c3_c* pre_c = u3_cm_pretty(som);
fprintf(stderr, "%s: %s\r\n", cap_c, pre_c);
free(pre_c);
}
/* u3_cm_tape(): dump a tape to stdout.
*/
void
u3_cm_tape(u3_noun tep)
{
u3_noun tap = tep;
while ( u3_nul != tap ) {
c3_c car_c;
if ( u3h(tap) >= 127 ) {
car_c = '?';
} else car_c = u3h(tap);
putc(car_c, stdout);
tap = u3t(tap);
}
u3z(tep);
}
/* u3_cm_wall(): dump a wall to stdout.
*/
void
u3_cm_wall(u3_noun wol)
{
u3_noun wal = wol;
while ( u3_nul != wal ) {
u3_cm_tape(u3k(u3h(wal)));
putc(13, stdout);
putc(10, stdout);
wal = u3t(wal);
}
u3z(wol);
}
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