| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: readobj.c,v 2.25 2023/02/07 20:28:16 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* readobj.c - routines for reading in object descriptions. |
| 6 |
* |
| 7 |
* External symbols declared in object.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include <ctype.h> |
| 13 |
#include <string.h> |
| 14 |
#include <stdio.h> |
| 15 |
|
| 16 |
#include "platform.h" |
| 17 |
#include "paths.h" |
| 18 |
#include "standard.h" |
| 19 |
#include "object.h" |
| 20 |
#include "otypes.h" |
| 21 |
|
| 22 |
|
| 23 |
OBJREC *objblock[MAXOBJBLK]; /* our objects */ |
| 24 |
OBJECT nobjects = 0; /* # of objects */ |
| 25 |
|
| 26 |
|
| 27 |
void |
| 28 |
readobj( /* read in an object file or stream */ |
| 29 |
char *inpspec |
| 30 |
) |
| 31 |
{ |
| 32 |
OBJECT lastobj; |
| 33 |
FILE *infp; |
| 34 |
char buf[2048]; |
| 35 |
int c; |
| 36 |
|
| 37 |
lastobj = nobjects; |
| 38 |
if (inpspec == NULL) { |
| 39 |
infp = stdin; |
| 40 |
inpspec = "standard input"; |
| 41 |
} else if (inpspec[0] == '!') { |
| 42 |
if ((infp = popen(inpspec+1, "r")) == NULL) { |
| 43 |
sprintf(errmsg, "cannot execute \"%s\"", inpspec); |
| 44 |
error(SYSTEM, errmsg); |
| 45 |
} |
| 46 |
} else if ((infp = fopen(inpspec, "r")) == NULL) { |
| 47 |
sprintf(errmsg, "cannot open scene file \"%s\"", inpspec); |
| 48 |
error(SYSTEM, errmsg); |
| 49 |
} |
| 50 |
#ifdef getc_unlocked /* avoid stupid semaphores */ |
| 51 |
flockfile(infp); |
| 52 |
#endif |
| 53 |
while ((c = getc(infp)) != EOF) { |
| 54 |
if (isspace(c)) |
| 55 |
continue; |
| 56 |
if (c == '#') { /* comment */ |
| 57 |
fgets(buf, sizeof(buf), infp); |
| 58 |
} else if (c == '!') { /* command */ |
| 59 |
ungetc(c, infp); |
| 60 |
fgetline(buf, sizeof(buf), infp); |
| 61 |
readobj(buf); |
| 62 |
} else { /* object */ |
| 63 |
ungetc(c, infp); |
| 64 |
getobject(inpspec, infp); |
| 65 |
} |
| 66 |
} |
| 67 |
if (inpspec[0] == '!') |
| 68 |
pclose(infp); |
| 69 |
else if (infp != stdin) |
| 70 |
fclose(infp); |
| 71 |
#ifdef getc_unlocked |
| 72 |
else |
| 73 |
funlockfile(infp); |
| 74 |
#endif |
| 75 |
if (nobjects == lastobj) { |
| 76 |
sprintf(errmsg, "(%s): empty file", inpspec); |
| 77 |
error(WARNING, errmsg); |
| 78 |
} |
| 79 |
} |
| 80 |
|
| 81 |
|
| 82 |
void |
| 83 |
getobject( /* read the next object */ |
| 84 |
char *name, |
| 85 |
FILE *fp |
| 86 |
) |
| 87 |
{ |
| 88 |
#define OALIAS -2 |
| 89 |
OBJECT obj; |
| 90 |
char sbuf[MAXSTR]; |
| 91 |
int rval; |
| 92 |
OBJREC *objp; |
| 93 |
|
| 94 |
if ((obj = newobject()) == OVOID) |
| 95 |
error(SYSTEM, "out of object space"); |
| 96 |
objp = objptr(obj); |
| 97 |
/* get modifier */ |
| 98 |
strcpy(sbuf, "EOF"); |
| 99 |
fgetword(sbuf, MAXSTR, fp); |
| 100 |
if (strchr(sbuf, '\t')) { |
| 101 |
sprintf(errmsg, "(%s): illegal tab in modifier \"%s\"", |
| 102 |
name, sbuf); |
| 103 |
error(USER, errmsg); |
| 104 |
} |
| 105 |
if (!strcmp(sbuf, VOIDID)) |
| 106 |
objp->omod = OVOID; |
| 107 |
else if (!strcmp(sbuf, ALIASMOD)) |
| 108 |
objp->omod = OALIAS; |
| 109 |
else if ((objp->omod = modifier(sbuf)) == OVOID) { |
| 110 |
sprintf(errmsg, "(%s): undefined modifier \"%s\"", name, sbuf); |
| 111 |
error(USER, errmsg); |
| 112 |
} |
| 113 |
/* get type */ |
| 114 |
strcpy(sbuf, "EOF"); |
| 115 |
fgetword(sbuf, MAXSTR, fp); |
| 116 |
if ((objp->otype = otype(sbuf)) < 0) { |
| 117 |
sprintf(errmsg, "(%s): unknown type \"%s\"", name, sbuf); |
| 118 |
error(USER, errmsg); |
| 119 |
} |
| 120 |
/* get identifier */ |
| 121 |
sbuf[0] = '\0'; |
| 122 |
fgetword(sbuf, MAXSTR, fp); |
| 123 |
if (strchr(sbuf, '\t')) { |
| 124 |
sprintf(errmsg, "(%s): illegal tab in identifier \"%s\"", |
| 125 |
name, sbuf); |
| 126 |
error(USER, errmsg); |
| 127 |
} |
| 128 |
objp->oname = savqstr(sbuf); |
| 129 |
/* get arguments */ |
| 130 |
if (objp->otype == MOD_ALIAS) { |
| 131 |
OBJECT ref; |
| 132 |
OBJREC *rfp; |
| 133 |
strcpy(sbuf, "EOF"); |
| 134 |
fgetword(sbuf, MAXSTR, fp); |
| 135 |
if ((ref = modifier(sbuf)) == OVOID) { |
| 136 |
sprintf(errmsg, "(%s): bad reference \"%s\"", |
| 137 |
name, sbuf); |
| 138 |
objerror(objp, USER, errmsg); |
| 139 |
} /* skip pass-thru aliases */ |
| 140 |
while ((rfp=objptr(ref))->otype == MOD_ALIAS && |
| 141 |
!rfp->oargs.nsargs & (rfp->omod != OVOID)) |
| 142 |
ref = rfp->omod; |
| 143 |
|
| 144 |
if ((objp->omod == OALIAS) | (objp->omod == rfp->omod)) { |
| 145 |
objp->omod = ref; |
| 146 |
} else { |
| 147 |
objp->oargs.sarg = (char **)malloc(sizeof(char *)); |
| 148 |
if (objp->oargs.sarg == NULL) |
| 149 |
error(SYSTEM, "out of memory in getobject"); |
| 150 |
objp->oargs.nsargs = 1; |
| 151 |
objp->oargs.sarg[0] = savestr(sbuf); |
| 152 |
} |
| 153 |
} else if ((rval = readfargs(&objp->oargs, fp)) == 0) { |
| 154 |
sprintf(errmsg, "(%s): bad arguments", name); |
| 155 |
objerror(objp, USER, errmsg); |
| 156 |
} else if (rval < 0) { |
| 157 |
sprintf(errmsg, "(%s): error reading scene", name); |
| 158 |
error(SYSTEM, errmsg); |
| 159 |
} |
| 160 |
if (objp->omod == OALIAS) { |
| 161 |
sprintf(errmsg, "(%s): inappropriate use of '%s' modifier", |
| 162 |
name, ALIASMOD); |
| 163 |
objerror(objp, USER, errmsg); |
| 164 |
} |
| 165 |
/* initialize */ |
| 166 |
objp->os = NULL; |
| 167 |
|
| 168 |
insertobject(obj); /* add to global structure */ |
| 169 |
#undef OALIAS |
| 170 |
} |
| 171 |
|
| 172 |
|
| 173 |
OBJECT |
| 174 |
newobject(void) /* get a new object */ |
| 175 |
{ |
| 176 |
int i; |
| 177 |
|
| 178 |
if ((nobjects & (OBJBLKSIZ-1)) == 0) { /* new block */ |
| 179 |
errno = 0; |
| 180 |
i = nobjects >> OBJBLKSHFT; |
| 181 |
if (i >= MAXOBJBLK) |
| 182 |
return(OVOID); |
| 183 |
objblock[i] = (OBJREC *)calloc(OBJBLKSIZ, sizeof(OBJREC)); |
| 184 |
if (objblock[i] == NULL) |
| 185 |
return(OVOID); |
| 186 |
} |
| 187 |
return(nobjects++); |
| 188 |
} |
| 189 |
|
| 190 |
void |
| 191 |
freeobjects( /* free a range of objects */ |
| 192 |
int firstobj, |
| 193 |
int nobjs |
| 194 |
) |
| 195 |
{ |
| 196 |
int obj; |
| 197 |
/* check bounds */ |
| 198 |
if (firstobj < 0) |
| 199 |
return; |
| 200 |
if (nobjs <= 0) |
| 201 |
return; |
| 202 |
if (firstobj + nobjs > nobjects) |
| 203 |
return; |
| 204 |
/* clear objects */ |
| 205 |
for (obj = firstobj+nobjs; obj-- > firstobj; ) { |
| 206 |
OBJREC *o = objptr(obj); |
| 207 |
free_os(o); /* free client memory */ |
| 208 |
freeqstr(o->oname); |
| 209 |
freefargs(&o->oargs); |
| 210 |
memset((void *)o, '\0', sizeof(OBJREC)); |
| 211 |
} |
| 212 |
/* free objects off end */ |
| 213 |
for (obj = nobjects; obj-- > 0; ) |
| 214 |
if (objptr(obj)->oname != NULL) |
| 215 |
break; |
| 216 |
if (++obj >= nobjects) |
| 217 |
return; |
| 218 |
while (nobjects > obj) /* free empty end blocks */ |
| 219 |
if ((--nobjects & (OBJBLKSIZ-1)) == 0) { |
| 220 |
int i = nobjects >> OBJBLKSHFT; |
| 221 |
free((void *)objblock[i]); |
| 222 |
objblock[i] = NULL; |
| 223 |
} |
| 224 |
truncobjndx(); /* truncate modifier look-up */ |
| 225 |
} |
