src/common/readobj.c

#ifndef lint
static const char RCSid[] = "$Id: readobj.c,v 2.22 2017/04/08 03:56:44 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  "paths.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);
        }
        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] == '!')
                pclose(infp);
        else if (infp != stdin)
                fclose(infp);
        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  alias;
                strcpy(sbuf, "EOF");
                fgetword(sbuf, MAXSTR, fp);
                if ((alias = modifier(sbuf)) == OVOID) {
                        sprintf(errmsg, "(%s): bad reference \"%s\"",
                                        name, sbuf);
                        objerror(objp, USER, errmsg);
                }
                if (objp->omod == OALIAS || 
                                objp->omod == objptr(alias)->omod) {
                        objp->omod = alias;
                } 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));
        }
        clearobjndx();
                                        /* free objects off end */
        for (obj = nobjects; obj-- > 0; )
                if (objptr(obj)->oname != NULL)
                        break;
        ++obj;
        while (nobjects > obj)          /* free empty end blocks */
                if ((--nobjects & (OBJBLKSIZ-1)) == 0) {
                        int     i = nobjects >> OBJBLKSHFT;
                        free((void *)objblock[i]);
                        objblock[i] = NULL;
                }
}
Revision:	2.23
Committed:	Sat May 4 00:36:58 2019 UTC (5 years ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 2.22:	+2 -2 lines
Log Message:	Eliminated cases where stdin was being closed
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.23	static const char RCSid[] = "$Id: readobj.c,v 2.22 2017/04/08 03:56:44 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	2.21	#include "paths.h"
18	greg	1.1	#include "standard.h"
19			#include "object.h"
20			#include "otypes.h"
21
22
23			OBJREC objblock[MAXOBJBLK]; / our objects */
24	greg	1.4	OBJECT nobjects = 0; /* # of objects */
25	greg	1.1
26
27	greg	2.8	void
28	greg	2.22	readobj( /* read in an object file or stream */
29			char *inpspec
30			)
31	greg	1.1	{
32	greg	2.4	OBJECT lastobj;
33	greg	1.1	FILE *infp;
34	greg	2.19	char buf[2048];
35	greg	2.22	int c;
36	greg	1.1
37	greg	2.4	lastobj = nobjects;
38			if (inpspec == NULL) {
39	greg	1.1	infp = stdin;
40	greg	2.4	inpspec = "standard input";
41			} else if (inpspec[0] == '!') {
42			if ((infp = popen(inpspec+1, "r")) == NULL) {
43			sprintf(errmsg, "cannot execute \"%s\"", inpspec);
44	greg	1.1	error(SYSTEM, errmsg);
45			}
46	greg	2.4	} else if ((infp = fopen(inpspec, "r")) == NULL) {
47			sprintf(errmsg, "cannot open scene file \"%s\"", inpspec);
48	greg	1.1	error(SYSTEM, errmsg);
49			}
50			while ((c = getc(infp)) != EOF) {
51			if (isspace(c))
52			continue;
53			if (c == '#') { /* comment */
54			fgets(buf, sizeof(buf), infp);
55	greg	1.2	} else if (c == '!') { /* command */
56	greg	1.1	ungetc(c, infp);
57	greg	1.2	fgetline(buf, sizeof(buf), infp);
58	greg	1.1	readobj(buf);
59			} else { /* object */
60			ungetc(c, infp);
61	greg	2.4	getobject(inpspec, infp);
62	greg	1.1	}
63			}
64	greg	2.4	if (inpspec[0] == '!')
65	greg	1.1	pclose(infp);
66	greg	2.23	else if (infp != stdin)
67	greg	1.1	fclose(infp);
68	greg	2.4	if (nobjects == lastobj) {
69			sprintf(errmsg, "(%s): empty file", inpspec);
70			error(WARNING, errmsg);
71			}
72	greg	1.1	}
73
74
75	greg	2.8	void
76	greg	2.22	getobject( /* read the next object */
77			char *name,
78			FILE *fp
79			)
80	greg	1.1	{
81	greg	2.11	#define OALIAS -2
82	greg	1.1	OBJECT obj;
83			char sbuf[MAXSTR];
84	greg	1.6	int rval;
85	greg	2.22	OBJREC *objp;
86	greg	1.1
87			if ((obj = newobject()) == OVOID)
88			error(SYSTEM, "out of object space");
89			objp = objptr(obj);
90			/* get modifier */
91	greg	1.7	strcpy(sbuf, "EOF");
92			fgetword(sbuf, MAXSTR, fp);
93	greg	2.20	if (strchr(sbuf, '\t')) {
94			sprintf(errmsg, "(%s): illegal tab in modifier \"%s\"",
95			name, sbuf);
96			error(USER, errmsg);
97			}
98	greg	1.1	if (!strcmp(sbuf, VOIDID))
99			objp->omod = OVOID;
100	greg	2.11	else if (!strcmp(sbuf, ALIASMOD))
101			objp->omod = OALIAS;
102	greg	1.1	else if ((objp->omod = modifier(sbuf)) == OVOID) {
103			sprintf(errmsg, "(%s): undefined modifier \"%s\"", name, sbuf);
104			error(USER, errmsg);
105			}
106			/* get type */
107	greg	1.7	strcpy(sbuf, "EOF");
108			fgetword(sbuf, MAXSTR, fp);
109	greg	2.11	if ((objp->otype = otype(sbuf)) < 0) {
110	greg	1.1	sprintf(errmsg, "(%s): unknown type \"%s\"", name, sbuf);
111			error(USER, errmsg);
112			}
113			/* get identifier */
114	greg	1.7	sbuf[0] = '\0';
115			fgetword(sbuf, MAXSTR, fp);
116	greg	2.20	if (strchr(sbuf, '\t')) {
117			sprintf(errmsg, "(%s): illegal tab in identifier \"%s\"",
118			name, sbuf);
119			error(USER, errmsg);
120			}
121	greg	1.1	objp->oname = savqstr(sbuf);
122			/* get arguments */
123	greg	2.11	if (objp->otype == MOD_ALIAS) {
124	greg	2.22	OBJECT alias;
125	greg	1.7	strcpy(sbuf, "EOF");
126			fgetword(sbuf, MAXSTR, fp);
127	greg	1.1	if ((alias = modifier(sbuf)) == OVOID) {
128	greg	2.11	sprintf(errmsg, "(%s): bad reference \"%s\"",
129			name, sbuf);
130			objerror(objp, USER, errmsg);
131			}
132			if (objp->omod == OALIAS \|\|
133			objp->omod == objptr(alias)->omod) {
134			objp->omod = alias;
135			} else {
136			objp->oargs.sarg = (char *)malloc(sizeof(char ));
137			if (objp->oargs.sarg == NULL)
138			error(SYSTEM, "out of memory in getobject");
139			objp->oargs.nsargs = 1;
140			objp->oargs.sarg[0] = savestr(sbuf);
141	greg	1.1	}
142	greg	1.6	} else if ((rval = readfargs(&objp->oargs, fp)) == 0) {
143	greg	1.1	sprintf(errmsg, "(%s): bad arguments", name);
144			objerror(objp, USER, errmsg);
145	greg	1.6	} else if (rval < 0) {
146			sprintf(errmsg, "(%s): error reading scene", name);
147			error(SYSTEM, errmsg);
148	greg	1.1	}
149	greg	2.11	if (objp->omod == OALIAS) {
150			sprintf(errmsg, "(%s): inappropriate use of '%s' modifier",
151			name, ALIASMOD);
152			objerror(objp, USER, errmsg);
153			}
154	greg	1.1	/* initialize */
155			objp->os = NULL;
156
157			insertobject(obj); /* add to global structure */
158	greg	2.11	#undef OALIAS
159	greg	1.1	}
160
161
162	greg	2.10	OBJECT
163	greg	2.22	newobject(void) /* get a new object */
164	greg	1.1	{
165	greg	2.22	int i;
166	greg	1.1
167	gwlarson	2.7	if ((nobjects & (OBJBLKSIZ-1)) == 0) { /* new block */
168	greg	1.1	errno = 0;
169	gwlarson	2.7	i = nobjects >> OBJBLKSHFT;
170	greg	1.1	if (i >= MAXOBJBLK)
171			return(OVOID);
172	greg	2.8	objblock[i] = (OBJREC *)calloc(OBJBLKSIZ, sizeof(OBJREC));
173	greg	1.1	if (objblock[i] == NULL)
174			return(OVOID);
175			}
176			return(nobjects++);
177	greg	2.8	}
178
179			void
180	greg	2.22	freeobjects( /* free a range of objects */
181			int firstobj,
182			int nobjs
183			)
184	greg	2.8	{
185	greg	2.22	int obj;
186	greg	2.8	/* check bounds */
187			if (firstobj < 0)
188			return;
189			if (nobjs <= 0)
190			return;
191			if (firstobj + nobjs > nobjects)
192			return;
193			/* clear objects */
194			for (obj = firstobj+nobjs; obj-- > firstobj; ) {
195	greg	2.22	OBJREC *o = objptr(obj);
196	greg	2.8	free_os(o); /* free client memory */
197			freeqstr(o->oname);
198			freefargs(&o->oargs);
199	schorsch	2.16	memset((void *)o, '\0', sizeof(OBJREC));
200	greg	2.8	}
201			clearobjndx();
202			/* free objects off end */
203			for (obj = nobjects; obj-- > 0; )
204			if (objptr(obj)->oname != NULL)
205			break;
206			++obj;
207			while (nobjects > obj) /* free empty end blocks */
208			if ((--nobjects & (OBJBLKSIZ-1)) == 0) {
209			int i = nobjects >> OBJBLKSHFT;
210			free((void *)objblock[i]);
211			objblock[i] = NULL;
212			}
213	greg	1.1	}