src/rt/rcmain.c

#ifndef lint
static const char       RCSid[] = "$Id: rcmain.c,v 2.16 2016/06/01 03:00:06 greg Exp $";
#endif
/*
 *  rcmain.c - main for rtcontrib ray contribution tracer
 */

#include "copyright.h"

#include <signal.h>
#include <time.h>
#include "rcontrib.h"
#include "random.h"
#include "source.h"
#include "ambient.h"
#include "pmapray.h"
#include "pmapcontrib.h"

int     gargc;                          /* global argc */
char    **gargv;                        /* global argv */
char    *octname;                       /* global octree name */
char    *progname;                      /* global argv[0] */

char    *sigerr[NSIG];                  /* signal error messages */

int     nproc = 1;                      /* number of processes requested */
int     nchild = 0;                     /* number of children (-1 in child) */

int     inpfmt = 'a';                   /* input format */
int     outfmt = 'a';                   /* output format */

int     header = 1;                     /* output header? */
int     force_open = 0;                 /* truncate existing output? */
int     recover = 0;                    /* recover previous output? */
int     accumulate = 1;                 /* input rays per output record */
int     contrib = 0;                    /* computing contributions? */

int     xres = 0;                       /* horizontal (scan) size */
int     yres = 0;                       /* vertical resolution */

int     using_stdout = 0;               /* are we using stdout? */

int     imm_irrad = 0;                  /* compute immediate irradiance? */
int     lim_dist = 0;                   /* limit distance? */

const char      *modname[MAXMODLIST];   /* ordered modifier name list */
int             nmods = 0;              /* number of modifiers */

void    (*addobjnotify[8])() = {ambnotify, NULL};

char    RCCONTEXT[] = "RC";             /* our special evaluation context */


static void
printdefaults(void)                     /* print default values to stdout */
{
        printf("-c %-5d\t\t\t# accumulated rays per record\n", accumulate);
        printf("-V%c\t\t\t\t# output %s\n", contrib ? '+' : '-',
                        contrib ? "contributions" : "coefficients");
        if (imm_irrad)
                printf("-I+\t\t\t\t# immediate irradiance on\n");
        printf("-n %-2d\t\t\t\t# number of rendering processes\n", nproc);
        printf("-x %-9d\t\t\t# %s\n", xres,
                        yres && xres ? "x resolution" : "flush interval");
        printf("-y %-9d\t\t\t# y resolution\n", yres);
        printf(lim_dist ? "-ld+\t\t\t\t# limit distance on\n" :
                        "-ld-\t\t\t\t# limit distance off\n");
        printf("-h%c\t\t\t\t# %s header\n", header ? '+' : '-',
                        header ? "output" : "no");
        printf("-f%c%c\t\t\t\t# format input/output = %s/%s\n",
                        inpfmt, outfmt, formstr(inpfmt), formstr(outfmt));
        printf(erract[WARNING].pf != NULL ?
                        "-w+\t\t\t\t# warning messages on\n" :
                        "-w-\t\t\t\t# warning messages off\n");
        print_rdefaults();
}


static void
onsig(                          /* fatal signal */
        int  signo
)
{
        static int  gotsig = 0;

        if (gotsig++)                   /* two signals and we're gone! */
                _exit(signo);

#ifdef SIGALRM
        alarm(15);                      /* allow 15 seconds to clean up */
        signal(SIGALRM, SIG_DFL);       /* make certain we do die */
#endif
        eputs("signal - ");
        eputs(sigerr[signo]);
        eputs("\n");
        quit(3);
}


static void
sigdie(                 /* set fatal signal */
        int  signo,
        char  *msg
)
{
        if (signal(signo, onsig) == SIG_IGN)
                signal(signo, SIG_IGN);
        sigerr[signo] = msg;
}


/* set input/output format */
static void
setformat(const char *fmt)
{
        switch (fmt[0]) {
        case 'f':
        case 'd':
                SET_FILE_BINARY(stdin);
                /* fall through */
        case 'a':
                inpfmt = fmt[0];
                break;
        default:
                goto fmterr;
        }
        switch (fmt[1]) {
        case '\0':
                outfmt = inpfmt;
                return;
        case 'a':
        case 'f':
        case 'd':
        case 'c':
                outfmt = fmt[1];
                break;
        default:
                goto fmterr;
        }
        if (!fmt[2])
                return;
fmterr:
        sprintf(errmsg, "Illegal i/o format: -f%s", fmt);
        error(USER, errmsg);
}


/* Set overriding options */
static void
override_options(void)
{
        shadthresh = 0;
        ambssamp = 0;
        ambacc = 0;
        if (accumulate <= 0)    /* no output flushing for single record */
                xres = yres = 0;
}


int
main(int argc, char *argv[])
{
#define  check(ol,al)           if (argv[i][ol] || \
                                badarg(argc-i-1,argv+i+1,al)) \
                                goto badopt
#define  check_bool(olen,var)           switch (argv[i][olen]) { \
                                case '\0': var = !var; break; \
                                case 'y': case 'Y': case 't': case 'T': \
                                case '+': case '1': var = 1; break; \
                                case 'n': case 'N': case 'f': case 'F': \
                                case '-': case '0': var = 0; break; \
                                default: goto badopt; }
        char    *curout = NULL;
        char    *prms = NULL;
        char    *binval = NULL;
        int     bincnt = 0;
        int     rval;
        int     i;
                                        /* global program name */
        progname = argv[0] = fixargv0(argv[0]);
        gargv = argv;
        gargc = argc;
#if defined(_WIN32) || defined(_WIN64)
        _setmaxstdio(2048);             /* increase file limit to maximum */
#endif
                                        /* initialize calcomp routines early */
        initfunc();
        setcontext(RCCONTEXT);
                                        /* option city */
        for (i = 1; i < argc; i++) {
                                                /* expand arguments */
                while ((rval = expandarg(&argc, &argv, i)) > 0)
                        ;
                if (rval < 0) {
                        sprintf(errmsg, "cannot expand '%s'", argv[i]);
                        error(SYSTEM, errmsg);
                }
                if (argv[i] == NULL || argv[i][0] != '-')
                        break;                  /* break from options */
                if (!strcmp(argv[i], "-version")) {
                        puts(VersionID);
                        quit(0);
                }
                if (!strcmp(argv[i], "-defaults") ||
                                !strcmp(argv[i], "-help")) {
                        override_options();
                        printdefaults();
                        quit(0);
                }
                rval = getrenderopt(argc-i, argv+i);
                if (rval >= 0) {
                        i += rval;
                        continue;
                }
                switch (argv[i][1]) {
                case 'n':                       /* number of cores */
                        check(2,"i");
                        nproc = atoi(argv[++i]);
                        if (nproc <= 0)
                                error(USER, "bad number of processes");
                        break;
                case 'V':                       /* output contributions */
                        check_bool(2,contrib);
                        break;
                case 'x':                       /* x resolution */
                        check(2,"i");
                        xres = atoi(argv[++i]);
                        break;
                case 'y':                       /* y resolution */
                        check(2,"i");
                        yres = atoi(argv[++i]);
                        break;
                case 'w':                       /* warnings */
                        rval = (erract[WARNING].pf != NULL);
                        check_bool(2,rval);
                        if (rval) erract[WARNING].pf = wputs;
                        else erract[WARNING].pf = NULL;
                        break;
                case 'e':                       /* expression */
                        check(2,"s");
                        scompile(argv[++i], NULL, 0);
                        break;
                case 'l':                       /* limit distance */
                        if (argv[i][2] != 'd')
                                goto badopt;
                        check_bool(3,lim_dist);
                        break;
                case 'I':                       /* immed. irradiance */
                        check_bool(2,imm_irrad);
                        break;
                case 'f':                       /* file or force or format */
                        if (!argv[i][2]) {
                                check(2,"s");
                                loadfunc(argv[++i]);
                                break;
                        }
                        if (argv[i][2] == 'o') {
                                check_bool(3,force_open);
                                break;
                        }
                        setformat(argv[i]+2);
                        break;
                case 'o':                       /* output */
                        check(2,"s");
                        curout = argv[++i];
                        break;
                case 'c':                       /* input rays per output */
                        check(2,"i");
                        accumulate = atoi(argv[++i]);
                        break;
                case 'r':                       /* recover output */
                        check_bool(2,recover);
                        break;
                case 'h':                       /* header output */
                        check_bool(2,header);
                        break;
                case 'p':                       /* parameter setting(s) */
                        check(2,"s");
                        set_eparams(prms = argv[++i]);
                        break;
                case 'b':                       /* bin expression/count */
                        if (argv[i][2] == 'n') {
                                check(3,"s");
                                bincnt = (int)(eval(argv[++i]) + .5);
                                break;
                        }
                        check(2,"s");
                        binval = argv[++i];
                        break;
                case 'm':                       /* modifier name */
                        check(2,"s");
                        addmodifier(argv[++i], curout, prms, binval, bincnt);
                        break;
                case 'M':                       /* modifier file */
                        check(2,"s");
                        addmodfile(argv[++i], curout, prms, binval, bincnt);
                        break;
                default:
                        goto badopt;
                }
        }
        if (nmods <= 0)
                error(USER, "missing required modifier argument");
                                        /* override some option settings */
        override_options();
                                        /* initialize object types */
        initotypes();
                                        /* initialize urand */
        if (rand_samp) {
                srandom((long)time(0));
                initurand(0);
        } else {
                srandom(0L);
                initurand(2048);
        }
                                        /* set up signal handling */
        sigdie(SIGINT, "Interrupt");
#ifdef SIGHUP
        sigdie(SIGHUP, "Hangup");
#endif
        sigdie(SIGTERM, "Terminate");
#ifdef SIGPIPE
        sigdie(SIGPIPE, "Broken pipe");
#endif
#ifdef SIGALRM
        sigdie(SIGALRM, "Alarm clock");
#endif
#ifdef  SIGXCPU
        sigdie(SIGXCPU, "CPU limit exceeded");
        sigdie(SIGXFSZ, "File size exceeded");
#endif
#ifdef  NICE
        nice(NICE);                     /* lower priority */
#endif
                                        /* get octree */
        if (i == argc)
                octname = NULL;
        else if (i == argc-1)
                octname = argv[i];
        else
                goto badopt;
        if (octname == NULL)
                error(USER, "missing octree argument");

        readoct(octname, ~(IO_FILES|IO_INFO), &thescene, NULL);
        nsceneobjs = nobjects;

        /* PMAP: set up & load photon maps */
        ray_init_pmap();     
        
        marksources();                  /* find and mark sources */
        
        /* PMAP: init photon map for light source contributions */
        initPmapContrib(&modconttab, nmods);

        setambient();                   /* initialize ambient calculation */
        
        rcontrib();                     /* trace ray contributions (loop) */

        ambsync();                      /* flush ambient file */

        /* PMAP: free photon maps */
        ray_done_pmap();     
        
        quit(0);        /* exit clean */

badopt:
        fprintf(stderr,
"Usage: %s [-n nprocs][-V][-c count][-r][-e expr][-f source][-o ospec][-p p1=V1,p2=V2][-b binv][-bn N] {-m mod | -M file} [rtrace options] octree\n",
                        progname);
        sprintf(errmsg, "command line error at '%s'", argv[i]);
        error(USER, errmsg);
        return(1);      /* pro forma return */

#undef  check
#undef  check_bool
}


void
wputs(                          /* warning output function */
        char    *s
)
{
        int  lasterrno = errno;
        eputs(s);
        errno = lasterrno;
}


void
eputs(                          /* put string to stderr */
        char  *s
)
{
        static int  midline = 0;

        if (!*s)
                return;
        if (!midline++) {
                fputs(progname, stderr);
                fputs(": ", stderr);
        }
        fputs(s, stderr);
        if (s[strlen(s)-1] == '\n') {
                fflush(stderr);
                midline = 0;
        }
}
Revision:	2.17
Committed:	Thu Nov 30 23:31:34 2017 UTC (6 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+4 -1 lines
Log Message:	Increased the limit on open files in rcontrib from 512 to 2048 under Windows
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.17	static const char RCSid[] = "$Id: rcmain.c,v 2.16 2016/06/01 03:00:06 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* rcmain.c - main for rtcontrib ray contribution tracer
6			*/
7
8			#include "copyright.h"
9
10			#include <signal.h>
11	greg	2.10	#include <time.h>
12	greg	2.1	#include "rcontrib.h"
13	greg	2.6	#include "random.h"
14	greg	2.1	#include "source.h"
15			#include "ambient.h"
16	greg	2.14	#include "pmapray.h"
17			#include "pmapcontrib.h"
18	greg	2.1
19			int gargc; /* global argc */
20			char *gargv; / global argv */
21			char octname; / global octree name */
22			char progname; / global argv[0] */
23
24			char sigerr[NSIG]; / signal error messages */
25
26			int nproc = 1; /* number of processes requested */
27			int nchild = 0; /* number of children (-1 in child) */
28
29			int inpfmt = 'a'; /* input format */
30			int outfmt = 'a'; /* output format */
31
32			int header = 1; /* output header? */
33			int force_open = 0; /* truncate existing output? */
34			int recover = 0; /* recover previous output? */
35			int accumulate = 1; /* input rays per output record */
36			int contrib = 0; /* computing contributions? */
37
38			int xres = 0; /* horizontal (scan) size */
39			int yres = 0; /* vertical resolution */
40
41			int using_stdout = 0; /* are we using stdout? */
42
43			int imm_irrad = 0; /* compute immediate irradiance? */
44			int lim_dist = 0; /* limit distance? */
45
46			const char modname[MAXMODLIST]; / ordered modifier name list */
47			int nmods = 0; /* number of modifiers */
48
49	greg	2.4	void (*addobjnotify[8])() = {ambnotify, NULL};
50
51	greg	2.9	char RCCONTEXT[] = "RC"; /* our special evaluation context */
52	greg	2.1
53
54			static void
55			printdefaults(void) /* print default values to stdout */
56			{
57	greg	2.3	printf("-c %-5d\t\t\t# accumulated rays per record\n", accumulate);
58			printf("-V%c\t\t\t\t# output %s\n", contrib ? '+' : '-',
59			contrib ? "contributions" : "coefficients");
60	greg	2.1	if (imm_irrad)
61			printf("-I+\t\t\t\t# immediate irradiance on\n");
62			printf("-n %-2d\t\t\t\t# number of rendering processes\n", nproc);
63			printf("-x %-9d\t\t\t# %s\n", xres,
64			yres && xres ? "x resolution" : "flush interval");
65			printf("-y %-9d\t\t\t# y resolution\n", yres);
66			printf(lim_dist ? "-ld+\t\t\t\t# limit distance on\n" :
67			"-ld-\t\t\t\t# limit distance off\n");
68			printf("-h%c\t\t\t\t# %s header\n", header ? '+' : '-',
69			header ? "output" : "no");
70			printf("-f%c%c\t\t\t\t# format input/output = %s/%s\n",
71			inpfmt, outfmt, formstr(inpfmt), formstr(outfmt));
72			printf(erract[WARNING].pf != NULL ?
73			"-w+\t\t\t\t# warning messages on\n" :
74			"-w-\t\t\t\t# warning messages off\n");
75			print_rdefaults();
76			}
77
78
79			static void
80			onsig( /* fatal signal */
81			int signo
82			)
83			{
84			static int gotsig = 0;
85
86			if (gotsig++) /* two signals and we're gone! */
87			_exit(signo);
88
89			#ifdef SIGALRM
90			alarm(15); /* allow 15 seconds to clean up */
91			signal(SIGALRM, SIG_DFL); /* make certain we do die */
92			#endif
93			eputs("signal - ");
94			eputs(sigerr[signo]);
95			eputs("\n");
96			quit(3);
97			}
98
99
100			static void
101			sigdie( /* set fatal signal */
102			int signo,
103			char *msg
104			)
105			{
106			if (signal(signo, onsig) == SIG_IGN)
107			signal(signo, SIG_IGN);
108			sigerr[signo] = msg;
109			}
110
111
112			/* set input/output format */
113			static void
114			setformat(const char *fmt)
115			{
116			switch (fmt[0]) {
117			case 'f':
118			case 'd':
119			SET_FILE_BINARY(stdin);
120			/* fall through */
121			case 'a':
122			inpfmt = fmt[0];
123			break;
124			default:
125			goto fmterr;
126			}
127			switch (fmt[1]) {
128			case '\0':
129			outfmt = inpfmt;
130			return;
131			case 'a':
132			case 'f':
133			case 'd':
134			case 'c':
135			outfmt = fmt[1];
136			break;
137			default:
138			goto fmterr;
139			}
140			if (!fmt[2])
141			return;
142			fmterr:
143			sprintf(errmsg, "Illegal i/o format: -f%s", fmt);
144			error(USER, errmsg);
145			}
146
147
148			/* Set overriding options */
149			static void
150			override_options(void)
151			{
152			shadthresh = 0;
153			ambssamp = 0;
154			ambacc = 0;
155			if (accumulate <= 0) /* no output flushing for single record */
156			xres = yres = 0;
157			}
158
159
160			int
161			main(int argc, char *argv[])
162			{
163			#define check(ol,al) if (argv[i][ol] \|\| \
164			badarg(argc-i-1,argv+i+1,al)) \
165			goto badopt
166	schorsch	2.15	#define check_bool(olen,var) switch (argv[i][olen]) { \
167	greg	2.1	case '\0': var = !var; break; \
168			case 'y': case 'Y': case 't': case 'T': \
169			case '+': case '1': var = 1; break; \
170			case 'n': case 'N': case 'f': case 'F': \
171			case '-': case '0': var = 0; break; \
172			default: goto badopt; }
173			char *curout = NULL;
174	greg	2.12	char *prms = NULL;
175	greg	2.1	char *binval = NULL;
176			int bincnt = 0;
177			int rval;
178			int i;
179			/* global program name */
180			progname = argv[0] = fixargv0(argv[0]);
181			gargv = argv;
182			gargc = argc;
183	greg	2.17	#if defined(_WIN32) \|\| defined(_WIN64)
184			_setmaxstdio(2048); /* increase file limit to maximum */
185			#endif
186	greg	2.1	/* initialize calcomp routines early */
187			initfunc();
188			setcontext(RCCONTEXT);
189			/* option city */
190			for (i = 1; i < argc; i++) {
191			/* expand arguments */
192			while ((rval = expandarg(&argc, &argv, i)) > 0)
193			;
194			if (rval < 0) {
195			sprintf(errmsg, "cannot expand '%s'", argv[i]);
196			error(SYSTEM, errmsg);
197			}
198			if (argv[i] == NULL \|\| argv[i][0] != '-')
199			break; /* break from options */
200			if (!strcmp(argv[i], "-version")) {
201			puts(VersionID);
202			quit(0);
203			}
204			if (!strcmp(argv[i], "-defaults") \|\|
205			!strcmp(argv[i], "-help")) {
206			override_options();
207			printdefaults();
208			quit(0);
209			}
210			rval = getrenderopt(argc-i, argv+i);
211			if (rval >= 0) {
212			i += rval;
213			continue;
214			}
215			switch (argv[i][1]) {
216			case 'n': /* number of cores */
217			check(2,"i");
218			nproc = atoi(argv[++i]);
219			if (nproc <= 0)
220			error(USER, "bad number of processes");
221			break;
222			case 'V': /* output contributions */
223	schorsch	2.15	check_bool(2,contrib);
224	greg	2.1	break;
225			case 'x': /* x resolution */
226			check(2,"i");
227			xres = atoi(argv[++i]);
228			break;
229			case 'y': /* y resolution */
230			check(2,"i");
231			yres = atoi(argv[++i]);
232			break;
233			case 'w': /* warnings */
234	greg	2.2	rval = (erract[WARNING].pf != NULL);
235	schorsch	2.15	check_bool(2,rval);
236	greg	2.1	if (rval) erract[WARNING].pf = wputs;
237			else erract[WARNING].pf = NULL;
238			break;
239			case 'e': /* expression */
240			check(2,"s");
241			scompile(argv[++i], NULL, 0);
242			break;
243			case 'l': /* limit distance */
244			if (argv[i][2] != 'd')
245			goto badopt;
246	schorsch	2.15	check_bool(3,lim_dist);
247	greg	2.1	break;
248			case 'I': /* immed. irradiance */
249	schorsch	2.15	check_bool(2,imm_irrad);
250	greg	2.1	break;
251			case 'f': /* file or force or format */
252			if (!argv[i][2]) {
253			check(2,"s");
254			loadfunc(argv[++i]);
255			break;
256			}
257			if (argv[i][2] == 'o') {
258	schorsch	2.15	check_bool(3,force_open);
259	greg	2.1	break;
260			}
261			setformat(argv[i]+2);
262			break;
263			case 'o': /* output */
264			check(2,"s");
265			curout = argv[++i];
266			break;
267			case 'c': /* input rays per output */
268			check(2,"i");
269			accumulate = atoi(argv[++i]);
270			break;
271			case 'r': /* recover output */
272	schorsch	2.15	check_bool(2,recover);
273	greg	2.1	break;
274			case 'h': /* header output */
275	schorsch	2.15	check_bool(2,header);
276	greg	2.1	break;
277	greg	2.12	case 'p': /* parameter setting(s) */
278			check(2,"s");
279	greg	2.13	set_eparams(prms = argv[++i]);
280	greg	2.12	break;
281	greg	2.1	case 'b': /* bin expression/count */
282			if (argv[i][2] == 'n') {
283			check(3,"s");
284			bincnt = (int)(eval(argv[++i]) + .5);
285			break;
286			}
287			check(2,"s");
288			binval = argv[++i];
289			break;
290			case 'm': /* modifier name */
291			check(2,"s");
292	greg	2.12	addmodifier(argv[++i], curout, prms, binval, bincnt);
293	greg	2.1	break;
294			case 'M': /* modifier file */
295			check(2,"s");
296	greg	2.12	addmodfile(argv[++i], curout, prms, binval, bincnt);
297	greg	2.1	break;
298			default:
299			goto badopt;
300			}
301			}
302	greg	2.11	if (nmods <= 0)
303			error(USER, "missing required modifier argument");
304	greg	2.1	/* override some option settings */
305			override_options();
306			/* initialize object types */
307			initotypes();
308			/* initialize urand */
309			if (rand_samp) {
310			srandom((long)time(0));
311			initurand(0);
312			} else {
313			srandom(0L);
314			initurand(2048);
315			}
316			/* set up signal handling */
317			sigdie(SIGINT, "Interrupt");
318			#ifdef SIGHUP
319			sigdie(SIGHUP, "Hangup");
320			#endif
321			sigdie(SIGTERM, "Terminate");
322			#ifdef SIGPIPE
323			sigdie(SIGPIPE, "Broken pipe");
324			#endif
325			#ifdef SIGALRM
326			sigdie(SIGALRM, "Alarm clock");
327			#endif
328			#ifdef SIGXCPU
329			sigdie(SIGXCPU, "CPU limit exceeded");
330			sigdie(SIGXFSZ, "File size exceeded");
331			#endif
332			#ifdef NICE
333			nice(NICE); /* lower priority */
334			#endif
335			/* get octree */
336			if (i == argc)
337			octname = NULL;
338			else if (i == argc-1)
339			octname = argv[i];
340			else
341			goto badopt;
342			if (octname == NULL)
343			error(USER, "missing octree argument");
344
345			readoct(octname, ~(IO_FILES\|IO_INFO), &thescene, NULL);
346			nsceneobjs = nobjects;
347
348	greg	2.14	/* PMAP: set up & load photon maps */
349			ray_init_pmap();
350
351	greg	2.1	marksources(); /* find and mark sources */
352	greg	2.14
353			/* PMAP: init photon map for light source contributions */
354			initPmapContrib(&modconttab, nmods);
355	greg	2.1
356			setambient(); /* initialize ambient calculation */
357	greg	2.14
358	greg	2.2	rcontrib(); /* trace ray contributions (loop) */
359	greg	2.1
360			ambsync(); /* flush ambient file */
361
362	greg	2.14	/* PMAP: free photon maps */
363			ray_done_pmap();
364
365	greg	2.1	quit(0); /* exit clean */
366
367			badopt:
368			fprintf(stderr,
369	greg	2.16	"Usage: %s [-n nprocs][-V][-c count][-r][-e expr][-f source][-o ospec][-p p1=V1,p2=V2][-b binv][-bn N] {-m mod \| -M file} [rtrace options] octree\n",
370	greg	2.1	progname);
371			sprintf(errmsg, "command line error at '%s'", argv[i]);
372			error(USER, errmsg);
373			return(1); /* pro forma return */
374
375			#undef check
376	schorsch	2.15	#undef check_bool
377	greg	2.1	}
378
379
380			void
381			wputs( /* warning output function */
382			char *s
383			)
384			{
385			int lasterrno = errno;
386			eputs(s);
387			errno = lasterrno;
388			}
389
390
391			void
392			eputs( /* put string to stderr */
393			char *s
394			)
395			{
396			static int midline = 0;
397
398			if (!*s)
399			return;
400			if (!midline++) {
401			fputs(progname, stderr);
402			fputs(": ", stderr);
403			}
404			fputs(s, stderr);
405			if (s[strlen(s)-1] == '\n') {
406			fflush(stderr);
407			midline = 0;
408			}
409			}