Add WARNING log method. it's the same as ERROR, except that when mpd starts,

warnings are buffered until the error log is opened, and then flushed to the
error log.

git-svn-id: https://svn.musicpd.org/mpd/trunk@1442 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/log.c

@@ -20,10 +20,16 @@
 
 #include "conf.h"
 #include "myfprintf.h"
+#include "utils.h"
 
+#include <stdlib.h>
 #include <string.h>
+#include <stdarg.h>
 
 int logLevel = LOG_LEVEL_LOW;
+short warningFlushed = 0;
+
+static char * warningBuffer = NULL;
 
 void initLog() {
 	if(strcmp(getConf()[CONF_LOG_LEVEL],"default")==0) {
@@ -37,4 +43,37 @@ void initLog() {
 	}
 	else ERROR("unknown log level \"%s\"\n",getConf()[CONF_LOG_LEVEL]);
 }
-/* vim:set shiftwidth=4 tabstop=8 expandtab: */
+
+#define BUFFER_LENGTH	4096
+
+void bufferWarning(char * format, ... ) {
+	va_list arglist;
+	char temp[BUFFER_LENGTH+1];
+
+	memset(temp, 0, BUFFER_LENGTH+1);
+
+	va_start(arglist, format);
+
+	vsnprintf(temp, BUFFER_LENGTH, format, arglist);
+
+	warningBuffer = appendToString(warningBuffer, temp);
+
+	va_end(arglist);
+}
+void flushWarningLog() {
+	char * s;
+
+	if(warningBuffer == NULL) return;
+
+	s = strtok(warningBuffer, "\n");
+	while ( s != NULL ) {
+		myfprintf(stderr, "%s\n", s);
+
+		s = strtok(NULL, "\n");
+	}
+
+	free(warningBuffer);
+	warningBuffer = NULL;
+
+	warningFlushed = 1;
+}