From a8d00e5d56b261376410c3c87c46327362763bd8 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sat, 22 Oct 2016 00:35:17 +0200
Subject: [PATCH] gif: just read and decode the first image when -9 or -c flag
 is specified

---
 sys/src/cmd/jpg/gif.c       |  2 +-
 sys/src/cmd/jpg/imagefile.h |  2 +-
 sys/src/cmd/jpg/readgif.c   | 10 ++++++----
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/sys/src/cmd/jpg/gif.c b/sys/src/cmd/jpg/gif.c
index 228fb2637..54eaf3054 100644
--- a/sys/src/cmd/jpg/gif.c
+++ b/sys/src/cmd/jpg/gif.c
@@ -288,7 +288,7 @@ show(int fd, char *name)
 	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";
diff --git a/sys/src/cmd/jpg/imagefile.h b/sys/src/cmd/jpg/imagefile.h
index 13d94a5c3..5c808b685 100644
--- a/sys/src/cmd/jpg/imagefile.h
+++ b/sys/src/cmd/jpg/imagefile.h
@@ -55,7 +55,7 @@ Rawimage**	readpng(int, int);
 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);
diff --git a/sys/src/cmd/jpg/readgif.c b/sys/src/cmd/jpg/readgif.c
index cac585325..02ac7712c 100644
--- a/sys/src/cmd/jpg/readgif.c
+++ b/sys/src/cmd/jpg/readgif.c
@@ -39,7 +39,7 @@ static char		readerr[] = "ReadGIF: read error: %r";
 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 @@ giferror(Header *h, char *fmt, ...)
 
 
 Rawimage**
-readgif(int fd, int colorspace)
+readgif(int fd, int colorspace, int justone)
 {
 	Rawimage **a;
 	Biobuf b;
@@ -122,7 +122,7 @@ readgif(int fd, int colorspace)
 	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 @@ inittbl(Header *h)
 
 static
 Rawimage**
-readarray(Header *h)
+readarray(Header *h, int justone)
 {
 	Entry *tbl;
 	Rawimage *new, **array;
@@ -202,6 +202,8 @@ readarray(Header *h)
 			array[nimages] = nil;
 			h->array = array;
 			h->new = nil;
+			if(justone)
+				goto Return;
 			break;
 
 		case 0x3B:	/* Trailer */