implement proper logging

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@179 fefdeb5f-60dc-0310-8127-8f9354f1896f

polyp/log.c

@@ -0,0 +1,48 @@
+#include <assert.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <stdio.h>
+
+#include "log.h"
+#include "xmalloc.h"
+#include "util.h"
+
+static char *log_ident = NULL;
+static enum pa_log_target log_target = PA_LOG_STDERR;
+static void (*user_log_func)(const char *s) = NULL;
+
+void pa_log_set_ident(const char *p) {
+    if (log_ident)
+        pa_xfree(log_ident);
+
+    log_ident = pa_xstrdup(p);
+}
+
+void pa_log_set_target(enum pa_log_target t, void (*func)(const char*s)) {
+    assert(t == PA_LOG_USER || !func);
+    log_target = t;
+    user_log_func = func;
+}
+
+void pa_log(const char *format, ...) {
+    va_list ap;
+    va_start(ap, format);
+
+    switch (log_target) {
+        case PA_LOG_STDERR:
+            vfprintf(stderr, format, ap);
+            break;
+        case PA_LOG_SYSLOG:
+            openlog(log_ident ? log_ident : "???", LOG_PID, LOG_USER);
+            vsyslog(LOG_INFO, format, ap);
+            closelog();
+            break;
+        case PA_LOG_USER: {
+            char *t = pa_vsprintf_malloc(format, ap);
+            assert(user_log_func);
+            user_log_func(t);
+        }
+    }
+
+    va_end(ap);
+}