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#ifndef lint |
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static const char RCSid[] = "$Id: readobj.c,v 2.28 2025/04/22 14:51:29 greg Exp $"; |
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#endif |
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/* |
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* readobj.c - routines for reading in object descriptions. |
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* |
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* External symbols declared in object.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <ctype.h> |
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#include <string.h> |
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#include <stdio.h> |
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|
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#include "platform.h" |
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#include "standard.h" |
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#include "object.h" |
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#include "otypes.h" |
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|
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|
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OBJREC *objblock[MAXOBJBLK]; /* our objects */ |
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OBJECT nobjects = 0; /* # of objects */ |
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|
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|
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void |
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readobj( /* read in an object file or stream */ |
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char *inpspec |
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) |
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{ |
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OBJECT lastobj; |
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FILE *infp; |
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char buf[2048]; |
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int c; |
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|
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lastobj = nobjects; |
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if (inpspec == NULL) { |
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infp = stdin; |
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inpspec = "standard input"; |
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} else if (inpspec[0] == '!') { |
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if ((infp = popen(inpspec+1, "r")) == NULL) { |
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sprintf(errmsg, "cannot execute \"%s\"", inpspec); |
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error(SYSTEM, errmsg); |
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} |
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} else if ((infp = fopen(inpspec, "r")) == NULL) { |
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sprintf(errmsg, "cannot open scene file \"%s\"", inpspec); |
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error(SYSTEM, errmsg); |
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} |
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#ifdef getc_unlocked /* avoid stupid semaphores */ |
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flockfile(infp); |
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#endif |
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while ((c = getc(infp)) != EOF) { |
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if (isspace(c)) |
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continue; |
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if (c == '#') { /* comment */ |
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fgets(buf, sizeof(buf), infp); |
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} else if (c == '!') { /* command */ |
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ungetc(c, infp); |
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fgetline(buf, sizeof(buf), infp); |
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readobj(buf); |
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} else { /* object */ |
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ungetc(c, infp); |
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getobject(inpspec, infp); |
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} |
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} |
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if (inpspec[0] == '!') { |
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if (pclose(infp) != 0) { |
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sprintf(errmsg, "bad status from \"%s\"", inpspec); |
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error(WARNING, errmsg); |
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} |
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} else if (infp != stdin) |
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fclose(infp); |
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#ifdef getc_unlocked |
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else |
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funlockfile(infp); |
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#endif |
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if (nobjects == lastobj) { |
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sprintf(errmsg, "(%s): empty file", inpspec); |
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error(WARNING, errmsg); |
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} |
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} |
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|
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|
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void |
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getobject( /* read the next object */ |
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char *name, |
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FILE *fp |
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) |
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{ |
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#define OALIAS -2 |
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OBJECT obj; |
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char sbuf[MAXSTR]; |
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int rval; |
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OBJREC *objp; |
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|
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if ((obj = newobject()) == OVOID) |
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error(SYSTEM, "out of object space"); |
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objp = objptr(obj); |
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/* get modifier */ |
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strcpy(sbuf, "EOF"); |
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fgetword(sbuf, MAXSTR, fp); |
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if (strchr(sbuf, '\t')) { |
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sprintf(errmsg, "(%s): illegal tab in modifier \"%s\"", |
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name, sbuf); |
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error(USER, errmsg); |
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} |
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if (!strcmp(sbuf, VOIDID)) |
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objp->omod = OVOID; |
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else if (!strcmp(sbuf, ALIASMOD)) |
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objp->omod = OALIAS; |
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else if ((objp->omod = modifier(sbuf)) == OVOID) { |
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sprintf(errmsg, "(%s): undefined modifier \"%s\"", name, sbuf); |
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error(USER, errmsg); |
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} |
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/* get type */ |
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strcpy(sbuf, "EOF"); |
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fgetword(sbuf, MAXSTR, fp); |
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if ((objp->otype = otype(sbuf)) < 0) { |
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sprintf(errmsg, "(%s): unknown type \"%s\"", name, sbuf); |
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error(USER, errmsg); |
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} |
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/* get identifier */ |
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sbuf[0] = '\0'; |
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fgetword(sbuf, MAXSTR, fp); |
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if (strchr(sbuf, '\t')) { |
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sprintf(errmsg, "(%s): illegal tab in identifier \"%s\"", |
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name, sbuf); |
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error(USER, errmsg); |
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} |
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objp->oname = savqstr(sbuf); |
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/* get arguments */ |
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if (objp->otype == MOD_ALIAS) { |
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OBJECT ref; |
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OBJREC *rfp; |
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strcpy(sbuf, "EOF"); |
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fgetword(sbuf, MAXSTR, fp); |
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if ((ref = modifier(sbuf)) == OVOID) { |
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sprintf(errmsg, "(%s): bad reference \"%s\"", |
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name, sbuf); |
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objerror(objp, USER, errmsg); |
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} /* skip pass-thru aliases */ |
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while ((rfp=objptr(ref))->otype == MOD_ALIAS && |
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!rfp->oargs.nsargs & (rfp->omod != OVOID)) |
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ref = rfp->omod; |
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|
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if ((objp->omod == OALIAS) | (objp->omod == rfp->omod)) { |
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objp->omod = ref; |
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} else { |
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objp->oargs.sarg = (char **)malloc(sizeof(char *)); |
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if (objp->oargs.sarg == NULL) |
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error(SYSTEM, "out of memory in getobject"); |
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objp->oargs.nsargs = 1; |
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objp->oargs.sarg[0] = savestr(sbuf); |
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} |
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} else if ((rval = readfargs(&objp->oargs, fp)) == 0) { |
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sprintf(errmsg, "(%s): bad arguments", name); |
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objerror(objp, USER, errmsg); |
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} else if (rval < 0) { |
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sprintf(errmsg, "(%s): error reading scene", name); |
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error(SYSTEM, errmsg); |
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} |
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if (objp->omod == OALIAS) { |
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sprintf(errmsg, "(%s): inappropriate use of '%s' modifier", |
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name, ALIASMOD); |
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objerror(objp, USER, errmsg); |
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} |
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/* initialize */ |
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objp->os = NULL; |
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|
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insertobject(obj); /* add to global structure */ |
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#undef OALIAS |
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} |
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|
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|
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OBJECT |
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newobject(void) /* get a new object */ |
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{ |
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int i; |
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|
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if ((nobjects & (OBJBLKSIZ-1)) == 0) { /* new block */ |
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errno = 0; |
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i = nobjects >> OBJBLKSHFT; |
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if (i >= MAXOBJBLK) |
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return(OVOID); |
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objblock[i] = (OBJREC *)calloc(OBJBLKSIZ, sizeof(OBJREC)); |
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if (objblock[i] == NULL) |
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return(OVOID); |
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} |
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return(nobjects++); |
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} |
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|
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void |
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freeobjects( /* free a range of objects */ |
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int firstobj, |
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int nobjs |
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) |
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{ |
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int obj; |
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/* check bounds */ |
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if (firstobj < 0) |
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return; |
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if (nobjs <= 0) |
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return; |
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if (firstobj + nobjs > nobjects) |
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return; |
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/* clear objects */ |
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for (obj = firstobj+nobjs; obj-- > firstobj; ) { |
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OBJREC *o = objptr(obj); |
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free_os(o); /* free client memory */ |
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freeqstr(o->oname); |
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freefargs(&o->oargs); |
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memset((void *)o, '\0', sizeof(OBJREC)); |
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} |
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/* free objects off end */ |
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for (obj = nobjects; obj-- > 0; ) |
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if (objptr(obj)->oname != NULL) |
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break; |
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if (++obj >= nobjects) |
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return; |
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while (nobjects > obj) /* free empty end blocks */ |
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if ((--nobjects & (OBJBLKSIZ-1)) == 0) { |
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int i = nobjects >> OBJBLKSHFT; |
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free((void *)objblock[i]); |
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objblock[i] = NULL; |
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} |
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truncobjndx(); /* truncate modifier look-up */ |
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} |
