make snprintf shared; dynamic resolution support

1 files changed, 45 insertions, 7 deletions

diff --git a/src/user/app/vterm/vterm.c b/src/user/app/vterm/vterm.c
index 0468477..43180b2 100644
--- a/src/user/app/vterm/vterm.c
+++ b/src/user/app/vterm/vterm.c
@@ -1,7 +1,10 @@
 #include "vterm.h"
 #include <camellia/syscalls.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 struct point cursor = {0};
 
@@ -26,15 +29,50 @@ void in_char(char c) {
 	while (cursor.y * font.h >= fb.height) scroll();
 }
 
-int main(void) {
-	fb_fd = _syscall_open("/kdev/video/b", 13, 0);
-	// TODO don't hardcode size
-	fb.len = 640 * 480 * 4;
-	fb.width = 640;
-	fb.height = 480;
-	fb.pitch = 640 * 4;
+int main();
+
+void fb_setup(void) {
+	#define BASEPATH "/kdev/video/"
+	char path[64], *spec;
+	size_t pos;
+	FILE *f;
+
+	f = fopen(BASEPATH, "r");
+	if (!f) {
+		eprintf("couldn't open %s", BASEPATH);
+		exit(1);
+	}
+
+	pos = strlen(BASEPATH);
+	memcpy(path, BASEPATH, pos);
+	spec = path + pos;
+	fread(spec, 1, sizeof(path) - pos, f);
+	/* assumes the read went correctly */
+	fclose(f);
+
+	fb_fd = _syscall_open(path, strlen(path), 0);
+	if (fb_fd < 0) {
+		eprintf("failed to open %s", path);
+		exit(1);
+	}
+
+	fb.width  = strtol(spec, &spec, 0);
+	if (*spec++ != 'x') { eprintf("bad filename format"); exit(1); }
+	fb.height = strtol(spec, &spec, 0);
+	if (*spec++ != 'x') { eprintf("bad filename format"); exit(1); }
+	fb.bpp = strtol(spec, &spec, 0);
+	fb.len = _syscall_getsize(fb_fd);
+	fb.pitch = fb.len / fb.height;
 	fb.b = malloc(fb.len);
 
+	if (fb.bpp != 32) {
+		eprintf("unsupported format %ux%ux%u", fb.width, fb.height, fb.bpp);
+		exit(1);
+	}
+}
+
+int main(void) {
+	fb_setup();
 	font_load("/init/font.psf");
 
 	static char buf[512];