Make the log longer, and make it faster to write to.

[netwatch.git] / aseg / vga-overlay.c

diff --git a/aseg/vga-overlay.c b/aseg/vga-overlay.c
index 7aa8b412c517f73f68f5afeead935b98c5c588cb..cfe6ac9de1186f9f7c44a4b1a7b0c6cfb6dba458 100644 (file)
--- a/aseg/vga-overlay.c
+++ b/aseg/vga-overlay.c
@@ -5,7 +5,11 @@
 #include <stdarg.h>
 #include <output.h>
 
-static char logents[4][41] = {{0}};
+#define LOGLEN 96
+#define LOG_ONSCREEN 4
+
+static char logents[LOGLEN][41] = {{0}};
+static int prodptr = 0;
 
 #define VRAM_BASE              0xA0000UL
 #define TEXT_CONSOLE_OFFSET    0x18000UL 
@@ -54,7 +58,7 @@ void outlog()
 
        smram_aseg_set_state(SMRAM_ASEG_SMMCODE);
 
-       for (y = 0; y < 4; y++)
+       for (y = 0; y < LOG_ONSCREEN; y++)
                for (x = 40; x < 80; x++)
                {
                        basep[y*80*2+x*2] = ' ';
@@ -63,14 +67,14 @@ void outlog()
 
        smram_restore_state(old_state);
        
-       for (y = 0; y < 4; y++)
-               strblit(logents[y], y, 40);
+       for (y = -LOG_ONSCREEN; y < 0; y++)
+               strblit(logents[(y + prodptr) % LOGLEN], y + LOG_ONSCREEN, 40);
 }
 
 void dolog(const char *s)
 {
-       memmove(logents[0], logents[1], sizeof(logents[0])*3);
-       strcpy(logents[3], s);
+       strcpy(logents[prodptr], s);
+       prodptr = (prodptr + 1) % LOGLEN;
 }
 void (*output)(const char *s) = dolog;
 
@@ -78,10 +82,10 @@ void dologf(const char *fmt, ...)
 {
        va_list va;
        
-       memmove(logents[0], logents[1], sizeof(logents[0])*3);
        va_start(va, fmt);
-       vsnprintf(logents[3], 40, fmt, va);
+       vsnprintf(logents[prodptr], 40, fmt, va);
        va_end(va);
+       prodptr = (prodptr + 1) % LOGLEN;
 }
 void (*outputf)(const char *s, ...) = dologf;