src/util/rpiece.c

/* Copyright (c) 1993 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Generate sections of a picture.
 */
 
#include "standard.h"
#include <fcntl.h>

#ifndef F_SETLKW

main(argc, argv)
int argc;
char *argv[];
{
        fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
        exit(1);
}

#else

#include <signal.h>
#include "color.h"
#include "view.h"
#include "resolu.h"

#ifndef NFS
#define  NFS                    1
#endif
                                /* set the following to 0 to forgo forking */
#ifndef MAXFORK
#if NFS
#define  MAXFORK                3       /* allotment of duped processes */
#else
#define  MAXFORK                0
#endif
#endif
                                        /* protection from SYSV signals(!) */
#if defined(sgi) || defined(hpux)
#define guard_io()      sighold(SIGALRM)
#define unguard()       sigrelse(SIGALRM)
#endif
#ifndef guard_io
#define guard_io()      0
#define unguard()       0
#endif
                                /* rpict command */
char  *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
int  rpargc = 9;
int  rpd[3];
FILE  *torp, *fromrp;
COLR  *pbuf;
                                /* our view parameters */
VIEW  ourview = STDVIEW;
double  pixaspect = 1.0;
int  hres = 512, vres = 512, hmult = 2, vmult = 2;
                                /* output file */
char  *outfile = NULL;
int  outfd;
long  scanorig;
int  syncfd = -1;               /* lock file descriptor */
int  nforked = 0;

char  *progname;
int  verbose = 0;

extern long  lseek(), ftell();

int  gotalrm = 0;
int  onalrm() { gotalrm++; }


main(argc, argv)
int  argc;
char  *argv[];
{
        register int  i, rval;
        
        progname = argv[0];
        for (i = 1; i < argc; i++) {
                                                /* expand arguments */
                while (rval = expandarg(&argc, &argv, i))
                        if (rval < 0) {
                                fprintf(stderr, "%s: cannot expand '%s'",
                                                argv[0], argv[i]);
                                exit(1);
                        }
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'v':
                                switch (argv[i][2]) {
                                case '\0':      /* verbose option */
                                        verbose = !verbose;
                                        continue;
                                case 'f':       /* view file */
                                        if (viewfile(argv[++i], &ourview, NULL) <= 0) {
                                                fprintf(stderr,
                                        "%s: not a view file\n", argv[i]);
                                                exit(1);
                                        }
                                        continue;
                                default:        /* view option? */
                                        rval = getviewopt(&ourview, argc-i, argv+i);
                                        if (rval >= 0) {
                                                i += rval;
                                                continue;
                                        }
                                        break;
                                }
                                break;
                        case 'p':               /* pixel aspect ratio? */
                                if (argv[i][2] == 'a' && !argv[i][3])
                                        pixaspect = atof(argv[i+1]);
                                break;
                        case 'x':               /* piece x resolution */
                                if (!argv[i][2])
                                        hres = atoi(argv[i+1]);
                                break;
                        case 'y':               /* piece y resolution */
                                if (!argv[i][2])
                                        vres = atoi(argv[i+1]);
                                break;
                        case 'X':               /* horizontal multiplier */
                                if (argv[i][2])
                                        break;
                                hmult = atoi(argv[++i]);
                                continue;
                        case 'Y':               /* vertical multiplier */
                                if (argv[i][2])
                                        break;
                                vmult = atoi(argv[++i]);
                                continue;
                        case 'F':               /* syncronization file */
                                if (argv[i][2])
                                        break;
                                if ((syncfd = open(argv[++i],
                                                O_RDWR|O_CREAT, 0666)) < 0) {
                                        fprintf(stderr, "%s: cannot open\n",
                                                        argv[i]);
                                        exit(1);
                                }
                                continue;
                        case 'z':               /* z-file ist verbotten */
                                fprintf(stderr, "%s: -z option not allowed\n",
                                                argv[0]);
                                exit(1);
                        case 'o':               /* output file */
                                if (argv[i][2])
                                        break;
                                outfile = argv[++i];
                                continue;
                        }
                rpargv[rpargc++] = argv[i];
        }
        rpargv[rpargc] = NULL;
        if (outfile == NULL) {
                fprintf(stderr, "%s: missing output file\n", argv[0]);
                exit(1);
        }
        init(argc, argv);
        rpiece();
        exit(cleanup(0));
}


init(ac, av)                    /* set up output file and start rpict */
int  ac;
char  **av;
{
        extern char  VersionID[];
        char  *err;
        FILE  *fp;
        int  hr, vr;
                                        /* set up view */
        if ((err = setview(&ourview)) != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        if (syncfd != -1) {
                char  buf[32];
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                sscanf(buf, "%d %d", &hmult, &vmult);
        }
        normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
                                        /* open output file */
        if ((outfd = open(outfile, O_WRONLY|O_CREAT|O_EXCL, 0666)) >= 0) {
                if ((fp = fdopen(dup(outfd), "w")) == NULL)
                        goto filerr;
                printargs(ac, av, fp);          /* write header */
                fprintf(fp, "SOFTWARE= %s\n", VersionID);
                fputs(VIEWSTR, fp);
                fprintview(&ourview, fp);
                putc('\n', fp);
                if (pixaspect < .99 || pixaspect > 1.01)
                        fputaspect(pixaspect, fp);
                fputformat(COLRFMT, fp);
                putc('\n', fp);
                fprtresolu(hres*hmult, vres*vmult, fp);
        } else if ((outfd = open(outfile, O_RDWR)) >= 0) {
                if ((fp = fdopen(dup(outfd), "r+")) == NULL)
                        goto filerr;
                getheader(fp, NULL, NULL);      /* skip header */
                if (!fscnresolu(&hr, &vr, fp) ||        /* check resolution */
                                hr != hres*hmult || vr != vres*vmult) {
                        fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
                                        progname, outfile);
                        exit(1);
                }
        } else {
                fprintf(stderr, "%s: cannot open file \"%s\"\n",
                                progname, outfile);
                exit(1);
        }
        scanorig = ftell(fp);           /* record position of first scanline */
        if (fclose(fp) == -1)           /* done with stream i/o */
                goto filerr;
#if NFS
        sync();                         /* flush NFS buffers */
#endif
                                        /* start rpict process */
        if (open_process(rpd, rpargv) <= 0) {
                fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
                exit(1);
        }
        if ((fromrp = fdopen(rpd[0], "r")) == NULL ||
                        (torp = fdopen(rpd[1], "w")) == NULL) {
                fprintf(stderr, "%s: cannot open stream to %s\n",
                                progname, rpargv[0]);
                exit(1);
        }
        if ((pbuf = (COLR *)malloc(hres*vres*sizeof(COLR))) == NULL) {
                fprintf(stderr, "%s: out of memory\n", progname);
                exit(1);
        }
        signal(SIGALRM, onalrm);
        return;
filerr:
        fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
        exit(1);
}


int
nextpiece(xp, yp)               /* get next piece assignment */
int  *xp, *yp;
{
        struct flock  fls;
        char  buf[64];

        if (gotalrm)                    /* someone wants us to quit */
                return(0);
        if (syncfd != -1) {             /* use sync file */
                fls.l_type = F_WRLCK;           /* gain exclusive access */
                fls.l_whence = 0;
                fls.l_start = 0L;
                fls.l_len = 0L;
                fcntl(syncfd, F_SETLKW, &fls);
                lseek(syncfd, 0L, 0);
                buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
                if (sscanf(buf, "%*d %*d %d %d", xp, yp) < 2) {
                        *xp = hmult-1;
                        *yp = vmult;
                }
                if (--(*yp) < 0) {              /* decrement position */
                        *yp = vmult-1;
                        if (--(*xp) < 0) {      /* all done! */
                                close(syncfd);
                                return(0);
                        }
                }
                sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, *xp, *yp);
                lseek(syncfd, 0L, 0);           /* write new position */
                write(syncfd, buf, strlen(buf));
                fls.l_type = F_UNLCK;           /* release sync file */
                fcntl(syncfd, F_SETLKW, &fls);
                return(1);
        }
        if (fgets(buf, sizeof(buf), stdin) == NULL)     /* use stdin */
                return(0);
        if (sscanf(buf, "%d %d", xp, yp) == 2)
                return(1);
        fprintf(stderr, "%s: input format error\n", progname);
        exit(cleanup(1));
}


int
cleanup(rstat)                  /* close rpict process and clean up */
int  rstat;
{
        int  status;

        free((char *)pbuf);
        fclose(torp);
        fclose(fromrp);
        while (wait(&status) != -1)
                if (rstat == 0)
                        rstat = status>>8 & 0xff;
        return(rstat);
}


rpiece()                        /* render picture piece by piece */
{
        VIEW  pview;
        int  xorg, yorg;
                                        /* compute view parameters */
        copystruct(&pview, &ourview);
        switch (ourview.type) {
        case VT_PER:
                pview.horiz = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*atan(
                                tan(PI/180./2.*ourview.vert)/vmult );
                break;
        case VT_PAR:
        case VT_ANG:
                pview.horiz = ourview.horiz / hmult;
                pview.vert = ourview.vert / vmult;
                break;
        case VT_HEM:
                pview.horiz = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.horiz)/hmult );
                pview.vert = 2.*180./PI*asin(
                                sin(PI/180./2.*ourview.vert)/vmult );
                break;
        default:
                fprintf(stderr, "%s: unknown view type '-vt%c'\n",
                                progname, ourview.type);
                exit(cleanup(1));
        }
                                        /* render each piece */
        while (nextpiece(&xorg, &yorg)) {
                pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
                pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
                fputs(VIEWSTR, torp);
                fprintview(&pview, torp);
                putc('\n', torp);
                fflush(torp);                   /* assigns piece to rpict */
                putpiece(xorg, yorg);           /* place piece in output */
        }
}


int
putpiece(xpos, ypos)            /* get next piece from rpict */
int  xpos, ypos;
{
        struct flock  fls;
        int  pid, status;
        int  hr, vr;
        register int  y;
                                /* check bounds */
        if (xpos < 0 | ypos < 0 | xpos >= hmult | ypos >= vmult) {
                fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
                                progname, xpos, ypos);
                exit(cleanup(1));
        }
                                /* check header from rpict */
        guard_io();
        getheader(fromrp, NULL, NULL);
        if (!fscnresolu(&hr, &vr, fromrp) || hr != hres | vr != vres) {
                fprintf(stderr, "%s: resolution mismatch from %s\n",
                                progname, rpargv[0]);
                exit(cleanup(1));
        }
        unguard();
                                /* load new piece into buffer */
        for (y = 0; y < vr; y++) {
                guard_io();
                if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
                        fprintf(stderr, "%s: read error from %s\n",
                                        progname, rpargv[0]);
                        exit(cleanup(1));
                }
                unguard();
        }
#if MAXFORK
                                /* fork so we don't slow rpict down */
        if ((pid = fork()) > 0) {
                if (++nforked >= MAXFORK) {
                        wait(&status);          /* reap a child */
                        if (status)
                                exit(cleanup(status>>8 & 0xff));
                        nforked--;
                }
                return(pid);
        }
#else
        pid = -1;               /* no forking */
#endif
        fls.l_start = scanorig +
                ((long)(vmult-1-ypos)*vres*hmult+xpos)*hres*sizeof(COLR);
#if NFS
        fls.l_len = ((long)(vres-1)*hmult+1)*hres*sizeof(COLR);
                                /* lock file section so NFS doesn't mess up */
        fls.l_whence = 0;
        fls.l_type = F_WRLCK;
        fcntl(outfd, F_SETLKW, &fls);
#endif
                                /* write new piece to file */
        if (lseek(outfd, fls.l_start, 0) == -1)
                goto seekerr;
        if (hmult == 1) {
                if (writebuf(outfd, (char *)pbuf,
                                vr*hr*sizeof(COLR)) != vr*hr*sizeof(COLR))
                        goto writerr;
        } else
                for (y = 0; y < vr; y++) {
                        if (writebuf(outfd, (char *)(pbuf+y*hr),
                                        hr*sizeof(COLR)) != hr*sizeof(COLR))
                                goto writerr;
                        if (y < vr-1 && lseek(outfd,
                                        (long)(hmult-1)*hr*sizeof(COLR),
                                        1) == -1)
                                goto seekerr;
                }
        if (verbose) {                          /* notify caller */
                printf("%d %d done\n", xpos, ypos);
                fflush(stdout);
        }
        if (pid == -1) {        /* didn't fork or fork failed */
#if NFS
                fls.l_type = F_UNLCK;           /* release lock */
                fcntl(outfd, F_SETLKW, &fls);
#endif
                return(0);
        }
        _exit(0);               /* else exit child process (releasing lock) */
seekerr:
        fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
        _exit(1);
writerr:
        fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
        _exit(1);
}

#endif
Revision:	2.22
Committed:	Wed Aug 4 10:08:47 1993 UTC (30 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.21:	+7 -0 lines
Log Message:	added option expansion
#	User	Rev	Content
1	greg	2.19	/* Copyright (c) 1993 Regents of the University of California */
2	greg	2.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Generate sections of a picture.
9			*/
10
11			#include "standard.h"
12			#include <fcntl.h>
13	greg	2.16
14			#ifndef F_SETLKW
15
16			main(argc, argv)
17			int argc;
18			char *argv[];
19			{
20			fprintf(stderr, "%s: no NFS lock manager on this machine\n", argv[0]);
21			exit(1);
22			}
23
24			#else
25
26	greg	2.6	#include <signal.h>
27	greg	2.1	#include "color.h"
28			#include "view.h"
29			#include "resolu.h"
30
31	greg	2.12	#ifndef NFS
32			#define NFS 1
33			#endif
34	greg	2.9	/* set the following to 0 to forgo forking */
35			#ifndef MAXFORK
36	greg	2.12	#if NFS
37	greg	2.10	#define MAXFORK 3 /* allotment of duped processes */
38	greg	2.12	#else
39			#define MAXFORK 0
40	greg	2.9	#endif
41	greg	2.12	#endif
42	greg	2.18	/* protection from SYSV signals(!) */
43			#if defined(sgi) \|\| defined(hpux)
44			#define guard_io() sighold(SIGALRM)
45			#define unguard() sigrelse(SIGALRM)
46			#endif
47			#ifndef guard_io
48			#define guard_io() 0
49			#define unguard() 0
50			#endif
51	greg	2.1	/* rpict command */
52	greg	2.4	char *rpargv[128] = {"rpict", "-S", "1", "-x", "512", "-y", "512", "-pa", "1"};
53			int rpargc = 9;
54	greg	2.1	int rpd[3];
55			FILE torp, fromrp;
56	greg	2.8	COLR *pbuf;
57	greg	2.1	/* our view parameters */
58			VIEW ourview = STDVIEW;
59	greg	2.4	double pixaspect = 1.0;
60	greg	2.1	int hres = 512, vres = 512, hmult = 2, vmult = 2;
61			/* output file */
62			char *outfile = NULL;
63			int outfd;
64			long scanorig;
65	greg	2.5	int syncfd = -1; /* lock file descriptor */
66	greg	2.9	int nforked = 0;
67	greg	2.1
68			char *progname;
69			int verbose = 0;
70
71			extern long lseek(), ftell();
72
73	greg	2.6	int gotalrm = 0;
74			int onalrm() { gotalrm++; }
75	greg	2.1
76	greg	2.6
77	greg	2.1	main(argc, argv)
78			int argc;
79			char *argv[];
80			{
81			register int i, rval;
82
83			progname = argv[0];
84			for (i = 1; i < argc; i++) {
85	greg	2.22	/* expand arguments */
86			while (rval = expandarg(&argc, &argv, i))
87			if (rval < 0) {
88			fprintf(stderr, "%s: cannot expand '%s'",
89			argv[0], argv[i]);
90			exit(1);
91			}
92	greg	2.1	if (argv[i][0] == '-')
93			switch (argv[i][1]) {
94			case 'v':
95			switch (argv[i][2]) {
96			case '\0': /* verbose option */
97			verbose = !verbose;
98			continue;
99			case 'f': /* view file */
100			if (viewfile(argv[++i], &ourview, NULL) <= 0) {
101			fprintf(stderr,
102			"%s: not a view file\n", argv[i]);
103			exit(1);
104			}
105			continue;
106			default: /* view option? */
107			rval = getviewopt(&ourview, argc-i, argv+i);
108			if (rval >= 0) {
109			i += rval;
110			continue;
111			}
112			break;
113			}
114			break;
115			case 'p': /* pixel aspect ratio? */
116			if (argv[i][2] == 'a' && !argv[i][3])
117			pixaspect = atof(argv[i+1]);
118			break;
119			case 'x': /* piece x resolution */
120			if (!argv[i][2])
121			hres = atoi(argv[i+1]);
122			break;
123			case 'y': /* piece y resolution */
124			if (!argv[i][2])
125			vres = atoi(argv[i+1]);
126			break;
127			case 'X': /* horizontal multiplier */
128			if (argv[i][2])
129			break;
130			hmult = atoi(argv[++i]);
131			continue;
132			case 'Y': /* vertical multiplier */
133			if (argv[i][2])
134			break;
135			vmult = atoi(argv[++i]);
136			continue;
137	greg	2.5	case 'F': /* syncronization file */
138			if (argv[i][2])
139			break;
140	greg	2.14	if ((syncfd = open(argv[++i],
141			O_RDWR\|O_CREAT, 0666)) < 0) {
142	greg	2.5	fprintf(stderr, "%s: cannot open\n",
143			argv[i]);
144			exit(1);
145			}
146			continue;
147	greg	2.15	case 'z': /* z-file ist verbotten */
148			fprintf(stderr, "%s: -z option not allowed\n",
149			argv[0]);
150			exit(1);
151	greg	2.1	case 'o': /* output file */
152			if (argv[i][2])
153			break;
154			outfile = argv[++i];
155			continue;
156			}
157			rpargv[rpargc++] = argv[i];
158			}
159			rpargv[rpargc] = NULL;
160			if (outfile == NULL) {
161			fprintf(stderr, "%s: missing output file\n", argv[0]);
162			exit(1);
163			}
164			init(argc, argv);
165			rpiece();
166	greg	2.15	exit(cleanup(0));
167	greg	2.1	}
168
169
170			init(ac, av) /* set up output file and start rpict */
171			int ac;
172			char **av;
173			{
174	greg	2.2	extern char VersionID[];
175	greg	2.1	char *err;
176			FILE *fp;
177			int hr, vr;
178			/* set up view */
179			if ((err = setview(&ourview)) != NULL) {
180			fprintf(stderr, "%s: %s\n", progname, err);
181			exit(1);
182			}
183	greg	2.5	if (syncfd != -1) {
184			char buf[32];
185			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
186			sscanf(buf, "%d %d", &hmult, &vmult);
187			}
188	greg	2.1	normaspect(viewaspect(&ourview)*hmult/vmult, &pixaspect, &hres, &vres);
189			/* open output file */
190			if ((outfd = open(outfile, O_WRONLY\|O_CREAT\|O_EXCL, 0666)) >= 0) {
191			if ((fp = fdopen(dup(outfd), "w")) == NULL)
192			goto filerr;
193			printargs(ac, av, fp); /* write header */
194	greg	2.2	fprintf(fp, "SOFTWARE= %s\n", VersionID);
195	greg	2.1	fputs(VIEWSTR, fp);
196			fprintview(&ourview, fp);
197			putc('\n', fp);
198			if (pixaspect < .99 \|\| pixaspect > 1.01)
199			fputaspect(pixaspect, fp);
200			fputformat(COLRFMT, fp);
201			putc('\n', fp);
202			fprtresolu(hreshmult, vresvmult, fp);
203			} else if ((outfd = open(outfile, O_RDWR)) >= 0) {
204			if ((fp = fdopen(dup(outfd), "r+")) == NULL)
205			goto filerr;
206	greg	2.13	getheader(fp, NULL, NULL); /* skip header */
207	greg	2.15	if (!fscnresolu(&hr, &vr, fp) \|\| /* check resolution */
208	greg	2.1	hr != hreshmult \|\| vr != vresvmult) {
209	greg	2.8	fprintf(stderr, "%s: resolution mismatch on file \"%s\"\n",
210			progname, outfile);
211	greg	2.1	exit(1);
212			}
213			} else {
214	greg	2.8	fprintf(stderr, "%s: cannot open file \"%s\"\n",
215			progname, outfile);
216	greg	2.1	exit(1);
217			}
218			scanorig = ftell(fp); /* record position of first scanline */
219			if (fclose(fp) == -1) /* done with stream i/o */
220			goto filerr;
221	greg	2.12	#if NFS
222	greg	2.8	sync(); /* flush NFS buffers */
223	greg	2.12	#endif
224	greg	2.1	/* start rpict process */
225			if (open_process(rpd, rpargv) <= 0) {
226	greg	2.3	fprintf(stderr, "%s: cannot start %s\n", progname, rpargv[0]);
227	greg	2.1	exit(1);
228			}
229			if ((fromrp = fdopen(rpd[0], "r")) == NULL \|\|
230			(torp = fdopen(rpd[1], "w")) == NULL) {
231			fprintf(stderr, "%s: cannot open stream to %s\n",
232			progname, rpargv[0]);
233			exit(1);
234			}
235	greg	2.8	if ((pbuf = (COLR )malloc(hresvres*sizeof(COLR))) == NULL) {
236	greg	2.1	fprintf(stderr, "%s: out of memory\n", progname);
237			exit(1);
238			}
239	greg	2.6	signal(SIGALRM, onalrm);
240	greg	2.1	return;
241			filerr:
242	greg	2.8	fprintf(stderr, "%s: i/o error on file \"%s\"\n", progname, outfile);
243	greg	2.1	exit(1);
244			}
245
246
247			int
248	greg	2.5	nextpiece(xp, yp) /* get next piece assignment */
249			int xp, yp;
250			{
251			struct flock fls;
252			char buf[64];
253
254	greg	2.6	if (gotalrm) /* someone wants us to quit */
255			return(0);
256			if (syncfd != -1) { /* use sync file */
257	greg	2.5	fls.l_type = F_WRLCK; /* gain exclusive access */
258			fls.l_whence = 0;
259			fls.l_start = 0L;
260			fls.l_len = 0L;
261			fcntl(syncfd, F_SETLKW, &fls);
262			lseek(syncfd, 0L, 0);
263			buf[read(syncfd, buf, sizeof(buf)-1)] = '\0';
264			if (sscanf(buf, "%d %d %d %d", xp, yp) < 2) {
265	greg	2.8	*xp = hmult-1;
266			*yp = vmult;
267			}
268			if (--(yp) < 0) { / decrement position */
269	greg	2.5	*yp = vmult-1;
270	greg	2.8	if (--(xp) < 0) { / all done! */
271	greg	2.5	close(syncfd);
272			return(0);
273			}
274			}
275	greg	2.17	sprintf(buf, "%4d %4d\n%4d %4d\n", hmult, vmult, xp, yp);
276	greg	2.5	lseek(syncfd, 0L, 0); /* write new position */
277			write(syncfd, buf, strlen(buf));
278			fls.l_type = F_UNLCK; /* release sync file */
279			fcntl(syncfd, F_SETLKW, &fls);
280			return(1);
281			}
282	greg	2.6	if (fgets(buf, sizeof(buf), stdin) == NULL) /* use stdin */
283	greg	2.5	return(0);
284			if (sscanf(buf, "%d %d", xp, yp) == 2)
285			return(1);
286			fprintf(stderr, "%s: input format error\n", progname);
287	greg	2.10	exit(cleanup(1));
288	greg	2.5	}
289
290
291			int
292	greg	2.10	cleanup(rstat) /* close rpict process and clean up */
293			int rstat;
294	greg	2.1	{
295	greg	2.10	int status;
296	greg	2.1
297	greg	2.8	free((char *)pbuf);
298	greg	2.1	fclose(torp);
299			fclose(fromrp);
300	greg	2.10	while (wait(&status) != -1)
301	greg	2.9	if (rstat == 0)
302			rstat = status>>8 & 0xff;
303			return(rstat);
304	greg	2.1	}
305
306
307			rpiece() /* render picture piece by piece */
308			{
309			VIEW pview;
310			int xorg, yorg;
311	greg	2.11	/* compute view parameters */
312			copystruct(&pview, &ourview);
313			switch (ourview.type) {
314			case VT_PER:
315			pview.horiz = 2.180./PIatan(
316			tan(PI/180./2.*ourview.horiz)/hmult );
317			pview.vert = 2.180./PIatan(
318			tan(PI/180./2.*ourview.vert)/vmult );
319			break;
320			case VT_PAR:
321			case VT_ANG:
322			pview.horiz = ourview.horiz / hmult;
323			pview.vert = ourview.vert / vmult;
324			break;
325			case VT_HEM:
326			pview.horiz = 2.180./PIasin(
327			sin(PI/180./2.*ourview.horiz)/hmult );
328			pview.vert = 2.180./PIasin(
329			sin(PI/180./2.*ourview.vert)/vmult );
330			break;
331			default:
332			fprintf(stderr, "%s: unknown view type '-vt%c'\n",
333			progname, ourview.type);
334			exit(cleanup(1));
335			}
336			/* render each piece */
337	greg	2.5	while (nextpiece(&xorg, &yorg)) {
338	greg	2.11	pview.hoff = ourview.hoff + xorg - 0.5*(hmult-1);
339			pview.voff = ourview.voff + yorg - 0.5*(vmult-1);
340	greg	2.1	fputs(VIEWSTR, torp);
341			fprintview(&pview, torp);
342			putc('\n', torp);
343	greg	2.11	fflush(torp); /* assigns piece to rpict */
344	greg	2.1	putpiece(xorg, yorg); /* place piece in output */
345			}
346			}
347
348
349	greg	2.9	int
350	greg	2.1	putpiece(xpos, ypos) /* get next piece from rpict */
351			int xpos, ypos;
352			{
353	greg	2.7	struct flock fls;
354	greg	2.9	int pid, status;
355	greg	2.1	int hr, vr;
356	greg	2.8	register int y;
357			/* check bounds */
358	greg	2.5	if (xpos < 0 \| ypos < 0 \| xpos >= hmult \| ypos >= vmult) {
359			fprintf(stderr, "%s: requested piece (%d,%d) out of range\n",
360			progname, xpos, ypos);
361	greg	2.10	exit(cleanup(1));
362	greg	2.5	}
363	greg	2.8	/* check header from rpict */
364	greg	2.18	guard_io();
365	greg	2.13	getheader(fromrp, NULL, NULL);
366	greg	2.15	if (!fscnresolu(&hr, &vr, fromrp) \|\| hr != hres \| vr != vres) {
367	greg	2.3	fprintf(stderr, "%s: resolution mismatch from %s\n",
368			progname, rpargv[0]);
369	greg	2.10	exit(cleanup(1));
370	greg	2.1	}
371	greg	2.18	unguard();
372	greg	2.8	/* load new piece into buffer */
373	greg	2.18	for (y = 0; y < vr; y++) {
374			guard_io();
375	greg	2.8	if (freadcolrs(pbuf+y*hr, hr, fromrp) < 0) {
376	greg	2.3	fprintf(stderr, "%s: read error from %s\n",
377			progname, rpargv[0]);
378	greg	2.10	exit(cleanup(1));
379	greg	2.1	}
380	greg	2.18	unguard();
381			}
382	greg	2.9	#if MAXFORK
383			/* fork so we don't slow rpict down */
384			if ((pid = fork()) > 0) {
385	greg	2.10	if (++nforked >= MAXFORK) {
386	greg	2.9	wait(&status); /* reap a child */
387			if (status)
388	greg	2.10	exit(cleanup(status>>8 & 0xff));
389	greg	2.9	nforked--;
390			}
391			return(pid);
392			}
393			#else
394			pid = -1; /* no forking */
395			#endif
396	greg	2.19	fls.l_start = scanorig +
397			((long)(vmult-1-ypos)vreshmult+xpos)hressizeof(COLR);
398	greg	2.12	#if NFS
399	greg	2.19	fls.l_len = ((long)(vres-1)hmult+1)hres*sizeof(COLR);
400	greg	2.8	/* lock file section so NFS doesn't mess up */
401			fls.l_whence = 0;
402			fls.l_type = F_WRLCK;
403			fcntl(outfd, F_SETLKW, &fls);
404	greg	2.12	#endif
405	greg	2.8	/* write new piece to file */
406	greg	2.19	if (lseek(outfd, fls.l_start, 0) == -1)
407	greg	2.8	goto seekerr;
408	greg	2.9	if (hmult == 1) {
409			if (writebuf(outfd, (char *)pbuf,
410			vrhrsizeof(COLR)) != vrhrsizeof(COLR))
411			goto writerr;
412			} else
413			for (y = 0; y < vr; y++) {
414			if (writebuf(outfd, (char )(pbuf+yhr),
415			hrsizeof(COLR)) != hrsizeof(COLR))
416			goto writerr;
417			if (y < vr-1 && lseek(outfd,
418			(long)(hmult-1)hrsizeof(COLR),
419			1) == -1)
420			goto seekerr;
421	greg	2.1	}
422	greg	2.20	if (verbose) { /* notify caller */
423			printf("%d %d done\n", xpos, ypos);
424			fflush(stdout);
425			}
426			if (pid == -1) { /* didn't fork or fork failed */
427	greg	2.12	#if NFS
428	greg	2.9	fls.l_type = F_UNLCK; /* release lock */
429			fcntl(outfd, F_SETLKW, &fls);
430	greg	2.12	#endif
431	greg	2.9	return(0);
432	greg	2.1	}
433	greg	2.9	_exit(0); /* else exit child process (releasing lock) */
434	greg	2.8	seekerr:
435			fprintf(stderr, "%s: seek error on file \"%s\"\n", progname, outfile);
436	greg	2.9	_exit(1);
437			writerr:
438			fprintf(stderr, "%s: write error on file \"%s\"\n", progname, outfile);
439			_exit(1);
440	greg	2.1	}
441	greg	2.16
442			#endif