osd: Draw log from bottom to top

src/main.c

@@ -101,7 +101,7 @@ static int sceDisplaySetFrameBuf_patched(const SceDisplayFrameBuf *pParam, int s
 
         // Draw first x characters from log
         if (g_main.config.log_enabled) {
-            osd_draw_string(20, 150, g_osd_buffer);
+            osd_draw_log(20, 150, pParam->height, g_osd_buffer);
         }
     }
     // Wrong version

src/osd.c

@@ -183,3 +183,25 @@ void osd_draw_stringf(int x, int y, const char *format, ...) {
 
     osd_draw_string(x, y, buffer);
 }
+
+void osd_draw_log(int x, int y, int maxy, const char *str) {
+    size_t slen = strlen(str);
+    if (slen <= 3)
+        return;
+
+    size_t line_end = slen - 1;
+
+    for (int i = slen - 2; i >= 0; i--) {
+        if (i == 0 || str[i - 1] == '\n') {
+            maxy -= FONT_HEIGHT;
+            if (maxy < y)
+                break;
+
+            for (size_t i_cur = 0; i_cur < line_end - i; i_cur++) {
+                osd_draw_char(str[i + i_cur], x + (i_cur * FONT_WIDTH * g_font_scale), (maxy - FONT_HEIGHT));
+            }
+
+            line_end = i - 1;
+        }
+    }
+}

src/osd.h

@@ -29,4 +29,6 @@ void osd_draw_char(const char character, int x, int y);
 void osd_draw_string(int x, int y, const char *str);
 void osd_draw_stringf(int x, int y, const char *format, ...);
 
+void osd_draw_log(int x, int y, int maxy, const char *str);
+
 #endif