Add lprintf function

2 files changed, 41 insertions, 0 deletions

diff --git a/clog.c b/clog.c
new file mode 100644
index 0000000..b4d0dd4
--- /dev/null
+++ b/clog.c
@@ -0,0 +1,35 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "clog.h"
+
+#define TIMESTRLEN 20
+
+int lprintf(const char *format, ...)
+{
+	va_list ap;
+	va_start(ap, format);
+
+	time_t timer = time(NULL);
+	struct tm *tm_info = localtime(&timer);
+
+	char buf[TIMESTRLEN];
+	strftime(buf, TIMESTRLEN, "%Y/%m/%d %H:%M:%S", tm_info);
+	free(tm_info);
+
+	int n = printf("%s ", buf);
+
+	size_t fmtlen = strlen(format) + 2;
+	char fmt[fmtlen];
+
+	memset(fmt, '\0', fmtlen);
+	strcpy(fmt, format);
+	strcat(fmt, "\n");
+
+	n += vprintf(format, ap);
+
+	va_end(ap);
+	return n;
+}
diff --git a/clog.h b/clog.h
new file mode 100644
index 0000000..50b8455
--- /dev/null
+++ b/clog.h
@@ -0,0 +1,6 @@
+#ifndef _CLOG_H_
+#define _CLOG_H_
+
+int lprintf(const char *format, ...);
+
+#endif