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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <memdraw.h>
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#include <ctype.h>
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#include <bio.h>
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#include "imagefile.h"
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void
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usage(void)
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{
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	fprint(2, "usage: togif [-l loopcount] [-c 'comment'] [-d Δt (ms)] [-t transparency-index] [file ... [-d Δt] file ...]\n");
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	exits("usage");
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}
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#define	UNSET (-12345678)
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void
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main(int argc, char *argv[])
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{
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	Biobuf bout;
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	Memimage *i, *ni;
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	int fd, j, dt, trans, loop;
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	char buf[256];
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	char *err, *comment, *s;
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	comment = nil;
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	dt = -1;
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	trans = -1;
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	loop = UNSET;
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	ARGBEGIN{
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	case 'l':
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		s = ARGF();
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		if(s==nil || (!isdigit(s[0]) && s[0]!='-'))
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			usage();
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		loop = atoi(s);
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		break;
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	case 'c':
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		comment = ARGF();
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		if(comment == nil)
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			usage();
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		break;
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	case 'd':
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		s = ARGF();
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		if(s==nil || !isdigit(s[0]))
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			usage();
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		dt = atoi(s);
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		break;
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	case 't':
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		s = ARGF();
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		if(s==nil || !isdigit(s[0]))
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			usage();
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		trans = atoi(s);
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		if(trans > 255)
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			usage();
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		break;
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	default:
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		usage();
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	}ARGEND
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	if(Binit(&bout, 1, OWRITE) < 0)
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		sysfatal("Binit failed: %r");
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	memimageinit();
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	err = nil;
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	if(argc == 0){
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		i = readmemimage(0);
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		if(i == nil)
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			sysfatal("reading input: %r");
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		ni = memonechan(i);
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		if(ni == nil)
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			sysfatal("converting image to RGBV: %r");
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		if(i != ni){
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			freememimage(i);
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			i = ni;
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		}
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		err = memstartgif(&bout, i, -1);
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		if(err == nil){
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			if(comment)
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				err = memwritegif(&bout, i, comment, dt, trans);
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			else{
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				snprint(buf, sizeof buf, "Converted by Plan 9 from <stdin>");
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				err = memwritegif(&bout, i, buf, dt, trans);
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			}
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		}
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	}else{
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		if(loop == UNSET){
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			if(argc == 1)
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				loop = -1;	/* no loop for single image */
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			else
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				loop = 0;	/* the default case: 0 means infinite loop */
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		}
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		for(j=0; j<argc; j++){
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			if(argv[j][0] == '-' && argv[j][1]=='d'){
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				/* time change */
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				if(argv[j][2] == '\0'){
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					s = argv[++j];
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					if(j == argc)
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						usage();
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				}else
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					s = &argv[j][2];
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				if(!isdigit(s[0]))
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					usage();
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				dt = atoi(s);
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				if(j == argc-1)	/* last argument must be file */
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					usage();
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				continue;
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			}
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			fd = open(argv[j], OREAD);
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			if(fd < 0)
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				sysfatal("can't open %s: %r", argv[j]);
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			i = readmemimage(fd);
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			if(i == nil)
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				sysfatal("can't readimage %s: %r", argv[j]);
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			close(fd);
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			ni = memonechan(i);
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			if(ni == nil)
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				sysfatal("converting image to RGBV: %r");
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			if(i != ni){
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				freememimage(i);
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				i = ni;
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			}
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			if(j == 0){
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				err = memstartgif(&bout, i, loop);
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				if(err != nil)
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					break;
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			}
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			if(comment)
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				err = memwritegif(&bout, i, comment, dt, trans);
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			else{
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				snprint(buf, sizeof buf, "Converted by Plan 9 from %s", argv[j]);
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				err = memwritegif(&bout, i, buf, dt, trans);
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			}
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			if(err != nil)
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				break;
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			freememimage(i);
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			comment = nil;
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		}
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	}
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	memendgif(&bout);
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144 
	if(err != nil)
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		fprint(2, "togif: %s\n", err);
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	exits(err);
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}