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gif: just read and decode the first image when -9 or -c flag is specified

--- a/sys/src/cmd/jpg/gif.c

+++ b/sys/src/cmd/jpg/gif.c

@@ -288,7 +288,7 @@

 	char buf[32];

 	err = nil;

-	images = readgif(fd, CRGB);

+	images = readgif(fd, CRGB, dflag);

 	if(images == nil){

 		fprint(2, "gif: decode %s failed: %r\n", name);

 		return "decode";

--- a/sys/src/cmd/jpg/imagefile.h

+++ b/sys/src/cmd/jpg/imagefile.h

@@ -55,7 +55,7 @@

 Rawimage**	Breadpng(Biobuf*, int);

 Rawimage**	readtif(int, int);

 Rawimage**	Breadtif(Biobuf*, int);

-Rawimage**	readgif(int, int);

+Rawimage**	readgif(int, int, int);

 Rawimage**	readpixmap(int, int);

 Rawimage*	torgbv(Rawimage*, int);

 Rawimage*	totruecolor(Rawimage*, int);

--- a/sys/src/cmd/jpg/readgif.c

+++ b/sys/src/cmd/jpg/readgif.c

@@ -39,7 +39,7 @@

 static char		extreaderr[] = "ReadGIF: can't read extension: %r";

 static char		memerr[] = "ReadGIF: malloc failed: %r";

-static Rawimage**	readarray(Header*);

+static Rawimage**	readarray(Header*, int);

 static Rawimage*	readone(Header*);

 static void			readheader(Header*);

 static void			skipextension(Header*);

@@ -100,7 +100,7 @@

 Rawimage**

-readgif(int fd, int colorspace)

+readgif(int fd, int colorspace, int justone)

 {

 	Rawimage **a;

 	Biobuf b;

@@ -122,7 +122,7 @@

 	if(setjmp(h->errlab))

 		a = nil;

 	else

-		a = readarray(h);

+		a = readarray(h, justone);

 	giffreeall(h, 0);

 	free(h);

 	return a;

@@ -144,7 +144,7 @@

 static

 Rawimage**

-readarray(Header *h)

+readarray(Header *h, int justone)

 {

 	Entry *tbl;

 	Rawimage *new, **array;

@@ -202,6 +202,8 @@

 			array[nimages] = nil;

 			h->array = array;

 			h->new = nil;

+			if(justone)

+				goto Return;

 			break;

 		case 0x3B:	/* Trailer */

-- 

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