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#include "a.h"
/*
* 17. Environment switching.
*/
typedef struct Env Env;
struct Env
{
int s;
int s0;
int f;
int f0;
int fi;
int ad;
int ce;
int v;
int v0;
int ls;
int ls0;
int it;
/* - ta */
/* - tc */
/* - lc */
/* - ul */
/* - cu */
/* - cc */
/* - c2 */
/* - nh */
/* - hy */
/* - hc */
/* - lt */
/* - nm */
/* - nn */
/* - mc */
};
Env defenv =
{
10,
10,
1,
1,
1,
1,
0,
12,
12,
0,
0,
0,
};
Env env[3];
Env *evstack[20];
int nevstack;
void
saveenv(Env *e)
{
e->s = getnr(L(".s"));
e->s0 = getnr(L(".s0"));
e->f = getnr(L(".f"));
e->f0 = getnr(L(".f0"));
e->fi = getnr(L(".fi"));
e->ad = getnr(L(".ad"));
e->ce = getnr(L(".ce"));
e->v = getnr(L(".v"));
e->v0 = getnr(L(".v0"));
e->ls = getnr(L(".ls"));
e->ls0 = getnr(L(".ls0"));
e->it = getnr(L(".it"));
}
void
restoreenv(Env *e)
{
nr(L(".s"), e->s);
nr(L(".s0"), e->s0);
nr(L(".f"), e->f);
nr(L(".f0"), e->f0);
nr(L(".fi"), e->fi);
nr(L(".ad"), e->ad);
nr(L(".ce"), e->ce);
nr(L(".v"), e->v);
nr(L(".v0"), e->v0);
nr(L(".ls"), e->ls);
nr(L(".ls0"), e->ls0);
nr(L(".it"), e->it);
nr(L(".ev"), e-env);
runmacro1(L("font"));
}
void
r_ev(int argc, Rune **argv)
{
int i;
Env *e;
if(argc == 1){
if(nevstack <= 0){
if(verbose) warn(".ev stack underflow");
return;
}
restoreenv(evstack[--nevstack]);
return;
}
if(nevstack >= nelem(evstack))
sysfatal(".ev stack overflow");
i = eval(argv[1]);
if(i < 0 || i > 2){
warn(".ev bad environment %d", i);
i = 0;
}
e = &env[getnr(L(".ev"))];
saveenv(e);
evstack[nevstack++] = e;
restoreenv(&env[i]);
}
void
t17init(void)
{
int i;
for(i=0; i<nelem(env); i++)
env[i] = defenv;
addreq(L("ev"), r_ev, -1);
}
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