inferno-os tree was separated from the inferno-os-android (separated from the Android driver)

1 files changed, 51 insertions, 0 deletions

diff --git a/libmemdraw/openmemsubfont.c b/libmemdraw/openmemsubfont.c
new file mode 100644
index 0000000..8fdf810
--- /dev/null
+++ b/libmemdraw/openmemsubfont.c
@@ -0,0 +1,51 @@
+#include "lib9.h"
+#include "draw.h"
+#include "memdraw.h"
+
+Memsubfont*
+openmemsubfont(char *name)
+{
+	Memsubfont *sf;
+	Memimage *i;
+	Fontchar *fc;
+	int fd, n;
+	char hdr[3*12+4+1];
+	uchar *p = nil;
+
+	fd = open(name, OREAD);
+	if(fd < 0)
+		return nil;
+	i = readmemimage(fd);
+	if(i == nil)
+		goto Err;
+	if(read(fd, hdr, 3*12) != 3*12){
+		werrstr("openmemsubfont: header read error: %r");
+		goto Err;
+	}
+	n = atoi(hdr);
+	p = malloc(6*(n+1));
+	if(p == nil)
+		goto Err;
+	if(read(fd, p, 6*(n+1)) != 6*(n+1)){
+		werrstr("openmemsubfont: fontchar read error: %r");
+		goto Err;
+	}
+	fc = malloc(sizeof(Fontchar)*(n+1));
+	if(fc == nil)
+		goto Err;
+	_unpackinfo(fc, p, n);
+	sf = allocmemsubfont(name, n, atoi(hdr+12), atoi(hdr+24), fc, i);
+	if(sf == nil){
+		free(fc);
+		goto Err;
+	}
+	free(p);
+	return sf;
+Err:
+	close(fd);
+	if (i != nil)
+		freememimage(i);
+	if (p != nil)
+		free(p);
+	return nil;
+}