src/common/readobj.c

#ifndef lint
static const char RCSid[] = "$Id: readobj.c,v 2.28 2025/04/22 14:51:29 greg Exp $";
#endif
/*
 *  readobj.c - routines for reading in object descriptions.
 *
 *  External symbols declared in object.h
 */

#include "copyright.h"

#include  <ctype.h>
#include  <string.h>
#include  <stdio.h>

#include  "platform.h"
#include  "standard.h"
#include  "object.h"
#include  "otypes.h"


OBJREC  *objblock[MAXOBJBLK];           /* our objects */
OBJECT  nobjects = 0;                   /* # of objects */


void
readobj(                                /* read in an object file or stream */
        char  *inpspec
)
{
        OBJECT  lastobj;
        FILE  *infp;
        char  buf[2048];
        int  c;

        lastobj = nobjects;
        if (inpspec == NULL) {
                infp = stdin;
                inpspec = "standard input";
        } else if (inpspec[0] == '!') {
                if ((infp = popen(inpspec+1, "r")) == NULL) {
                        sprintf(errmsg, "cannot execute \"%s\"", inpspec);
                        error(SYSTEM, errmsg);
                }
        } else if ((infp = fopen(inpspec, "r")) == NULL) {
                sprintf(errmsg, "cannot open scene file \"%s\"", inpspec);
                error(SYSTEM, errmsg);
        }
#ifdef getc_unlocked                    /* avoid stupid semaphores */
        flockfile(infp);
#endif
        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(inpspec, infp);
                }
        }
        if (inpspec[0] == '!') {
                if (pclose(infp) != 0) {
                        sprintf(errmsg, "bad status from \"%s\"", inpspec);
                        error(WARNING, errmsg);
                }
        } else if (infp != stdin)
                fclose(infp);
#ifdef getc_unlocked
        else
                funlockfile(infp);
#endif
        if (nobjects == lastobj) {
                sprintf(errmsg, "(%s): empty file", inpspec);
                error(WARNING, errmsg);
        }
}


void
getobject(                              /* read the next object */
        char  *name,
        FILE  *fp
)
{
#define OALIAS  -2
        OBJECT  obj;
        char  sbuf[MAXSTR];
        int  rval;
        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 (strchr(sbuf, '\t')) {
                sprintf(errmsg, "(%s): illegal tab in modifier \"%s\"",
                                        name, sbuf);
                error(USER, errmsg);
        }
        if (!strcmp(sbuf, VOIDID))
                objp->omod = OVOID;
        else if (!strcmp(sbuf, ALIASMOD))
                objp->omod = OALIAS;
        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 ((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);
        if (strchr(sbuf, '\t')) {
                sprintf(errmsg, "(%s): illegal tab in identifier \"%s\"",
                                        name, sbuf);
                error(USER, errmsg);
        }
        objp->oname = savqstr(sbuf);
                                        /* get arguments */
        if (objp->otype == MOD_ALIAS) {
                OBJECT  ref;
                OBJREC  *rfp;
                strcpy(sbuf, "EOF");
                fgetword(sbuf, MAXSTR, fp);
                if ((ref = modifier(sbuf)) == OVOID) {
                        sprintf(errmsg, "(%s): bad reference \"%s\"",
                                        name, sbuf);
                        objerror(objp, USER, errmsg);
                }                       /* skip pass-thru aliases */
                while ((rfp=objptr(ref))->otype == MOD_ALIAS &&
                                !rfp->oargs.nsargs & (rfp->omod != OVOID))
                        ref = rfp->omod;

                if ((objp->omod == OALIAS) | (objp->omod == rfp->omod)) {
                        objp->omod = ref;
                } else {
                        objp->oargs.sarg = (char **)malloc(sizeof(char *));
                        if (objp->oargs.sarg == NULL)
                                error(SYSTEM, "out of memory in getobject");
                        objp->oargs.nsargs = 1;
                        objp->oargs.sarg[0] = savestr(sbuf);
                }
        } 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);
        }
        if (objp->omod == OALIAS) {
                sprintf(errmsg, "(%s): inappropriate use of '%s' modifier",
                                name, ALIASMOD);
                objerror(objp, USER, errmsg);
        }
                                        /* initialize */
        objp->os = NULL;

        insertobject(obj);              /* add to global structure */
#undef OALIAS
}


OBJECT
newobject(void)                         /* get a new object */
{
        int  i;

        if ((nobjects & (OBJBLKSIZ-1)) == 0) {  /* new block */
                errno = 0;
                i = nobjects >> OBJBLKSHFT;
                if (i >= MAXOBJBLK)
                        return(OVOID);
                objblock[i] = (OBJREC *)calloc(OBJBLKSIZ, sizeof(OBJREC));
                if (objblock[i] == NULL)
                        return(OVOID);
        }
        return(nobjects++);
}

void
freeobjects(                            /* free a range of objects */
        int firstobj,
        int nobjs
)
{
        int  obj;
                                        /* check bounds */
        if (firstobj < 0)
                return;
        if (nobjs <= 0)
                return;
        if (firstobj + nobjs > nobjects)
                return;
                                        /* clear objects */
        for (obj = firstobj+nobjs; obj-- > firstobj; ) {
                OBJREC  *o = objptr(obj);
                free_os(o);             /* free client memory */
                freeqstr(o->oname);
                freefargs(&o->oargs);
                memset((void *)o, '\0', sizeof(OBJREC));
        }
                                        /* free objects off end */
        for (obj = nobjects; obj-- > 0; )
                if (objptr(obj)->oname != NULL)
                        break;
        if (++obj >= nobjects)
                return;
        while (nobjects > obj)          /* free empty end blocks */
                if ((--nobjects & (OBJBLKSIZ-1)) == 0) {
                        int     i = nobjects >> OBJBLKSHFT;
                        free((void *)objblock[i]);
                        objblock[i] = NULL;
                }
        truncobjndx();                  /* truncate modifier look-up */
}
Revision:	2.29
Committed:	Sat Jun 7 05:09:45 2025 UTC (29 hours, 35 minutes ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.28:	+1 -2 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.29	static const char RCSid[] = "$Id: readobj.c,v 2.28 2025/04/22 14:51:29 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* readobj.c - routines for reading in object descriptions.
6			*
7	greg	2.8	* External symbols declared in object.h
8			*/
9
10	greg	2.9	#include "copyright.h"
11	greg	1.1
12	schorsch	2.13	#include <ctype.h>
13	schorsch	2.16	#include <string.h>
14	schorsch	2.14	#include <stdio.h>
15	schorsch	2.13
16	greg	2.17	#include "platform.h"
17	greg	1.1	#include "standard.h"
18			#include "object.h"
19			#include "otypes.h"
20
21
22			OBJREC objblock[MAXOBJBLK]; / our objects */
23	greg	1.4	OBJECT nobjects = 0; /* # of objects */
24	greg	1.1
25
26	greg	2.8	void
27	greg	2.22	readobj( /* read in an object file or stream */
28			char *inpspec
29			)
30	greg	1.1	{
31	greg	2.4	OBJECT lastobj;
32	greg	1.1	FILE *infp;
33	greg	2.19	char buf[2048];
34	greg	2.22	int c;
35	greg	1.1
36	greg	2.4	lastobj = nobjects;
37			if (inpspec == NULL) {
38	greg	1.1	infp = stdin;
39	greg	2.4	inpspec = "standard input";
40			} else if (inpspec[0] == '!') {
41			if ((infp = popen(inpspec+1, "r")) == NULL) {
42			sprintf(errmsg, "cannot execute \"%s\"", inpspec);
43	greg	1.1	error(SYSTEM, errmsg);
44			}
45	greg	2.4	} else if ((infp = fopen(inpspec, "r")) == NULL) {
46			sprintf(errmsg, "cannot open scene file \"%s\"", inpspec);
47	greg	1.1	error(SYSTEM, errmsg);
48			}
49	greg	2.25	#ifdef getc_unlocked /* avoid stupid semaphores */
50			flockfile(infp);
51			#endif
52	greg	1.1	while ((c = getc(infp)) != EOF) {
53			if (isspace(c))
54			continue;
55			if (c == '#') { /* comment */
56			fgets(buf, sizeof(buf), infp);
57	greg	1.2	} else if (c == '!') { /* command */
58	greg	1.1	ungetc(c, infp);
59	greg	1.2	fgetline(buf, sizeof(buf), infp);
60	greg	1.1	readobj(buf);
61			} else { /* object */
62			ungetc(c, infp);
63	greg	2.4	getobject(inpspec, infp);
64	greg	1.1	}
65			}
66	greg	2.27	if (inpspec[0] == '!') {
67			if (pclose(infp) != 0) {
68			sprintf(errmsg, "bad status from \"%s\"", inpspec);
69	greg	2.28	error(WARNING, errmsg);
70	greg	2.27	}
71			} else if (infp != stdin)
72	greg	1.1	fclose(infp);
73	greg	2.25	#ifdef getc_unlocked
74			else
75			funlockfile(infp);
76			#endif
77	greg	2.4	if (nobjects == lastobj) {
78			sprintf(errmsg, "(%s): empty file", inpspec);
79			error(WARNING, errmsg);
80			}
81	greg	1.1	}
82
83
84	greg	2.8	void
85	greg	2.22	getobject( /* read the next object */
86			char *name,
87			FILE *fp
88			)
89	greg	1.1	{
90	greg	2.11	#define OALIAS -2
91	greg	1.1	OBJECT obj;
92			char sbuf[MAXSTR];
93	greg	1.6	int rval;
94	greg	2.22	OBJREC *objp;
95	greg	1.1
96			if ((obj = newobject()) == OVOID)
97			error(SYSTEM, "out of object space");
98			objp = objptr(obj);
99			/* get modifier */
100	greg	1.7	strcpy(sbuf, "EOF");
101			fgetword(sbuf, MAXSTR, fp);
102	greg	2.20	if (strchr(sbuf, '\t')) {
103			sprintf(errmsg, "(%s): illegal tab in modifier \"%s\"",
104			name, sbuf);
105			error(USER, errmsg);
106			}
107	greg	1.1	if (!strcmp(sbuf, VOIDID))
108			objp->omod = OVOID;
109	greg	2.11	else if (!strcmp(sbuf, ALIASMOD))
110			objp->omod = OALIAS;
111	greg	1.1	else if ((objp->omod = modifier(sbuf)) == OVOID) {
112			sprintf(errmsg, "(%s): undefined modifier \"%s\"", name, sbuf);
113			error(USER, errmsg);
114			}
115			/* get type */
116	greg	1.7	strcpy(sbuf, "EOF");
117			fgetword(sbuf, MAXSTR, fp);
118	greg	2.11	if ((objp->otype = otype(sbuf)) < 0) {
119	greg	1.1	sprintf(errmsg, "(%s): unknown type \"%s\"", name, sbuf);
120			error(USER, errmsg);
121			}
122			/* get identifier */
123	greg	1.7	sbuf[0] = '\0';
124			fgetword(sbuf, MAXSTR, fp);
125	greg	2.20	if (strchr(sbuf, '\t')) {
126			sprintf(errmsg, "(%s): illegal tab in identifier \"%s\"",
127			name, sbuf);
128			error(USER, errmsg);
129			}
130	greg	1.1	objp->oname = savqstr(sbuf);
131			/* get arguments */
132	greg	2.11	if (objp->otype == MOD_ALIAS) {
133	greg	2.26	OBJECT ref;
134			OBJREC *rfp;
135	greg	1.7	strcpy(sbuf, "EOF");
136			fgetword(sbuf, MAXSTR, fp);
137	greg	2.26	if ((ref = modifier(sbuf)) == OVOID) {
138	greg	2.11	sprintf(errmsg, "(%s): bad reference \"%s\"",
139			name, sbuf);
140			objerror(objp, USER, errmsg);
141	greg	2.26	} /* skip pass-thru aliases */
142			while ((rfp=objptr(ref))->otype == MOD_ALIAS &&
143			!rfp->oargs.nsargs & (rfp->omod != OVOID))
144			ref = rfp->omod;
145
146			if ((objp->omod == OALIAS) \| (objp->omod == rfp->omod)) {
147			objp->omod = ref;
148	greg	2.11	} else {
149			objp->oargs.sarg = (char *)malloc(sizeof(char ));
150			if (objp->oargs.sarg == NULL)
151			error(SYSTEM, "out of memory in getobject");
152			objp->oargs.nsargs = 1;
153			objp->oargs.sarg[0] = savestr(sbuf);
154	greg	1.1	}
155	greg	1.6	} else if ((rval = readfargs(&objp->oargs, fp)) == 0) {
156	greg	1.1	sprintf(errmsg, "(%s): bad arguments", name);
157			objerror(objp, USER, errmsg);
158	greg	1.6	} else if (rval < 0) {
159			sprintf(errmsg, "(%s): error reading scene", name);
160			error(SYSTEM, errmsg);
161	greg	1.1	}
162	greg	2.11	if (objp->omod == OALIAS) {
163			sprintf(errmsg, "(%s): inappropriate use of '%s' modifier",
164			name, ALIASMOD);
165			objerror(objp, USER, errmsg);
166			}
167	greg	1.1	/* initialize */
168			objp->os = NULL;
169
170			insertobject(obj); /* add to global structure */
171	greg	2.11	#undef OALIAS
172	greg	1.1	}
173
174
175	greg	2.10	OBJECT
176	greg	2.22	newobject(void) /* get a new object */
177	greg	1.1	{
178	greg	2.22	int i;
179	greg	1.1
180	gwlarson	2.7	if ((nobjects & (OBJBLKSIZ-1)) == 0) { /* new block */
181	greg	1.1	errno = 0;
182	gwlarson	2.7	i = nobjects >> OBJBLKSHFT;
183	greg	1.1	if (i >= MAXOBJBLK)
184			return(OVOID);
185	greg	2.8	objblock[i] = (OBJREC *)calloc(OBJBLKSIZ, sizeof(OBJREC));
186	greg	1.1	if (objblock[i] == NULL)
187			return(OVOID);
188			}
189			return(nobjects++);
190	greg	2.8	}
191
192			void
193	greg	2.22	freeobjects( /* free a range of objects */
194			int firstobj,
195			int nobjs
196			)
197	greg	2.8	{
198	greg	2.22	int obj;
199	greg	2.8	/* check bounds */
200			if (firstobj < 0)
201			return;
202			if (nobjs <= 0)
203			return;
204			if (firstobj + nobjs > nobjects)
205			return;
206			/* clear objects */
207			for (obj = firstobj+nobjs; obj-- > firstobj; ) {
208	greg	2.22	OBJREC *o = objptr(obj);
209	greg	2.8	free_os(o); /* free client memory */
210			freeqstr(o->oname);
211			freefargs(&o->oargs);
212	schorsch	2.16	memset((void *)o, '\0', sizeof(OBJREC));
213	greg	2.8	}
214			/* free objects off end */
215			for (obj = nobjects; obj-- > 0; )
216			if (objptr(obj)->oname != NULL)
217			break;
218	greg	2.24	if (++obj >= nobjects)
219			return;
220	greg	2.8	while (nobjects > obj) /* free empty end blocks */
221			if ((--nobjects & (OBJBLKSIZ-1)) == 0) {
222			int i = nobjects >> OBJBLKSHFT;
223			free((void *)objblock[i]);
224			objblock[i] = NULL;
225			}
226	greg	2.24	truncobjndx(); /* truncate modifier look-up */
227	greg	1.1	}