1 files changed, 78 insertions, 0 deletions
diff --git a/compat/win32/syslog.c b/compat/win32/syslog.c
new file mode 100644
index 0000000000..d015e436d5
--- /dev/null
+++ b/compat/win32/syslog.c
@@ -0,0 +1,78 @@
+#include "../../git-compat-util.h"
+
+static HANDLE ms_eventlog;
+
+void openlog(const char *ident, int logopt, int facility)
+{
+	if (ms_eventlog)
+		return;
+
+	ms_eventlog = RegisterEventSourceA(NULL, ident);
+
+	if (!ms_eventlog)
+		warning("RegisterEventSource() failed: %lu", GetLastError());
+}
+
+void syslog(int priority, const char *fmt, ...)
+{
+	WORD logtype;
+	char *str, *pos;
+	int str_len;
+	va_list ap;
+
+	if (!ms_eventlog)
+		return;
+
+	va_start(ap, fmt);
+	str_len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+
+	if (str_len < 0) {
+		warning("vsnprintf failed: '%s'", strerror(errno));
+		return;
+	}
+
+	str = malloc(str_len + 1);
+	if (!str) {
+		warning("malloc failed: '%s'", strerror(errno));
+		return;
+	}
+
+	va_start(ap, fmt);
+	vsnprintf(str, str_len + 1, fmt, ap);
+	va_end(ap);
+
+	while ((pos = strstr(str, "%1")) != NULL) {
+		str = realloc(str, ++str_len + 1);
+		if (!str) {
+			warning("realloc failed: '%s'", strerror(errno));
+			return;
+		}
+		memmove(pos + 2, pos + 1, strlen(pos));
+		pos[1] = ' ';
+	}
+
+	switch (priority) {
+	case LOG_EMERG:
+	case LOG_ALERT:
+	case LOG_CRIT:
+	case LOG_ERR:
+		logtype = EVENTLOG_ERROR_TYPE;
+		break;
+
+	case LOG_WARNING:
+		logtype = EVENTLOG_WARNING_TYPE;
+		break;
+
+	case LOG_NOTICE:
+	case LOG_INFO:
+	case LOG_DEBUG:
+	default:
+		logtype = EVENTLOG_INFORMATION_TYPE;
+		break;
+	}
+
+	ReportEventA(ms_eventlog, logtype, 0, 0, NULL, 1, 0,
+	    (const char **)&str, NULL);
+	free(str);
+}