X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fdos%2Flogger.c;fp=src%2Fdos%2Flogger.c;h=2d610704e4a9ed0013878b940e3989f71f03bd55;hp=70489ad8c09da828b78153433422191635411ea6;hb=dfc6ebacd7bcc1e6b9e7168c3e4824d241d2d5c8;hpb=0aeee13aa695ec617ec22253824f17209660bd39

diff --git a/src/dos/logger.c b/src/dos/logger.c
index 70489ad..2d61070 100644
--- a/src/dos/logger.c
+++ b/src/dos/logger.c
@@ -5,17 +5,63 @@
 #include <fcntl.h>
 #include "logger.h"
 
+static int logfd = -1, orig_fd1 = -1;
+
 int init_logger(const char *fname)
 {
-	int fd;
-	if((fd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, 0644)) == -1) {
+	if(logfd != -1) return -1;
+
+	if((logfd = open(fname, O_CREAT | O_WRONLY | O_TRUNC, 0644)) == -1) {
 		fprintf(stderr, "init_logger: failed to open %s: %s\n", fname, strerror(errno));
 		return -1;
 	}
 
+	orig_fd1 = dup(1);
 	close(1);
 	close(2);
-	dup(fd);
-	dup(fd);
+	dup(logfd);
+	dup(logfd);
+	return 0;
+}
+
+void stop_logger(void)
+{
+	if(logfd >= 0) {
+		close(logfd);
+		logfd = -1;
+	}
+	if(orig_fd1 >= 0) {
+		close(1);
+		close(2);
+		dup(orig_fd1);
+		dup(orig_fd1);
+		orig_fd1 = -1;
+	}
+}
+
+int print_tail(const char *fname)
+{
+	FILE *fp;
+	char buf[64];
+	long lineoffs[16];
+	int wr, rd, c;
+
+	if(!(fp = fopen(fname, "r"))) {
+		return -1;
+	}
+	lineoffs[wr++] = 0;
+	while(fgets(buf, sizeof buf, fp)) {
+		lineoffs[wr] = ftell(fp);
+		wr = (wr + 1) & 0xf;
+		if(wr == rd) {
+			rd = (rd + 1) & 0xf;
+		}
+	}
+
+	fseek(fp, lineoffs[rd], SEEK_SET);
+	while((c = fgetc(fp)) != -1) {
+		fputc(c, stdout);
+	}
+	fclose(fp);
 	return 0;
 }