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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* 0x100 * 32 = 8K (but we likely won't get that much) */
#define LOG_PAGE_SIZE 0x20
#define LOG_MAX_PAGES 16
#define LOG_SCROLL_PAGES 2
static char *log_buffer = NULL;
static char *log_buf_end = NULL;
static char *log_buf_current = NULL;
static int log_pages = LOG_MAX_PAGES;
// static char last_log_nick[NICKLEN + 1];
static void alloc_log_buffer() {
log_buffer = malloc(LOG_PAGE_SIZE * log_pages);
log_buf_end = (char *)(log_buffer + log_pages * LOG_PAGE_SIZE - 1);
log_buf_end[1] = 0xaa;
log_buf_current = log_buffer;
}
static void log_msg(char *msg) {
int len = strlen(msg);
if( (log_buf_current + len + 1) > log_buf_end ) {
memmove(log_buffer, log_buffer + (LOG_SCROLL_PAGES * LOG_PAGE_SIZE), (log_pages - LOG_SCROLL_PAGES) * LOG_PAGE_SIZE);
log_buf_current -= (LOG_SCROLL_PAGES * LOG_PAGE_SIZE);
}
memcpy(log_buf_current, msg, len);
log_buf_current += (len + 1);
*log_buf_current = '\0';
}
static void dump_log_stats(void) {
printf("start: %x, end: %x, cur: %x\n", log_buffer, log_buf_end, log_buf_current);
}
void main(void) {
char buf[100];
int i;
alloc_log_buffer();
dump_log_stats();
for(i=0; i<24; i++) {
sprintf(buf, ":--------------------Iteration #%d\n", i);
log_msg(buf);
dump_log_stats();
}
HANG: goto HANG;
}
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