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READOBJ.C
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1993-10-07
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/* Copyright (c) 1986 Regents of the University of California */
#ifndef lint
static char SCCSid[] = "@(#)readobj.c 2.1 11/12/91 LBL";
#endif
/*
* readobj.c - routines for reading in object descriptions.
*
* 7/28/85
*/
#include "standard.h"
#include "object.h"
#include "otypes.h"
#include <ctype.h>
extern char *fgetword(), *strcpy();
OBJREC *objblock[MAXOBJBLK]; /* our objects */
OBJECT nobjects = 0; /* # of objects */
readobj(input) /* read in an object file or stream */
char *input;
{
FILE *popen();
char *fgets(), *fgetline();
FILE *infp;
char buf[512];
register int c;
if (input == NULL) {
infp = stdin;
input = "standard input";
} else if (input[0] == '!') {
if ((infp = popen(input+1, "r")) == NULL) {
sprintf(errmsg, "cannot execute \"%s\"", input);
error(SYSTEM, errmsg);
}
} else if ((infp = fopen(input, "r")) == NULL) {
sprintf(errmsg, "cannot open scene file \"%s\"", input);
error(SYSTEM, errmsg);
}
while ((c = getc(infp)) != EOF) {
if (isspace(c))
continue;
if (c == '#') { /* comment */
fgets(buf, sizeof(buf), infp);
} else if (c == '!') { /* command */
ungetc(c, infp);
fgetline(buf, sizeof(buf), infp);
readobj(buf);
} else { /* object */
ungetc(c, infp);
getobject(input, infp);
}
}
if (input[0] == '!')
pclose(infp);
else
fclose(infp);
}
getobject(name, fp) /* read the next object */
char *name;
FILE *fp;
{
OBJECT obj;
char sbuf[MAXSTR];
int rval;
register OBJREC *objp;
if ((obj = newobject()) == OVOID)
error(SYSTEM, "out of object space");
objp = objptr(obj);
/* get modifier */
strcpy(sbuf, "EOF");
fgetword(sbuf, MAXSTR, fp);
if (!strcmp(sbuf, VOIDID))
objp->omod = OVOID;
else if ((objp->omod = modifier(sbuf)) == OVOID) {
sprintf(errmsg, "(%s): undefined modifier \"%s\"", name, sbuf);
error(USER, errmsg);
}
/* get type */
strcpy(sbuf, "EOF");
fgetword(sbuf, MAXSTR, fp);
if (!strcmp(sbuf, ALIASID))
objp->otype = -1;
else if ((objp->otype = otype(sbuf)) < 0) {
sprintf(errmsg, "(%s): unknown type \"%s\"", name, sbuf);
error(USER, errmsg);
}
/* get identifier */
sbuf[0] = '\0';
fgetword(sbuf, MAXSTR, fp);
objp->oname = savqstr(sbuf);
/* get arguments */
if (objp->otype == -1) {
register OBJECT alias;
strcpy(sbuf, "EOF");
fgetword(sbuf, MAXSTR, fp);
if ((alias = modifier(sbuf)) == OVOID) {
sprintf(errmsg,
"(%s): bad reference \"%s\" for %s \"%s\"",
name, sbuf, ALIASID, objp->oname);
error(USER, errmsg);
}
objp->otype = objptr(alias)->otype;
copystruct(&objp->oargs, &objptr(alias)->oargs);
} else if ((rval = readfargs(&objp->oargs, fp)) == 0) {
sprintf(errmsg, "(%s): bad arguments", name);
objerror(objp, USER, errmsg);
} else if (rval < 0) {
sprintf(errmsg, "(%s): error reading scene", name);
error(SYSTEM, errmsg);
}
/* initialize */
objp->os = NULL;
objp->lastrno = -1;
insertobject(obj); /* add to global structure */
}
int
newobject() /* get a new object */
{
register int i;
if ((nobjects & 077) == 0) { /* new block */
errno = 0;
i = nobjects >> 6;
if (i >= MAXOBJBLK)
return(OVOID);
objblock[i] = (OBJREC *)bmalloc(0100*sizeof(OBJREC));
if (objblock[i] == NULL)
return(OVOID);
}
return(nobjects++);
}