Core: Add compile time option to use native OS logging facility

[platform/upstream/libusb.git] / libusb / core.c

diff --git a/libusb/core.c b/libusb/core.c
index 4f2f366..1418415 100644 (file)
--- a/libusb/core.c
+++ b/libusb/core.c
@@ -33,6 +33,9 @@
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #endif
+#ifdef HAVE_SYSLOG_H
+#include <syslog.h>
+#endif
 
 #ifdef __ANDROID__
 #include <android/log.h>
@@ -2026,10 +2029,34 @@ int usbi_gettimeofday(struct timeval *tp, void *tzp)
 }
 #endif
 
-static void usbi_log_str(struct libusb_context *ctx, const char * str)
+static void usbi_log_str(struct libusb_context *ctx,
+       enum libusb_log_level level, const char * str)
 {
-       UNUSED(ctx);
+#if defined(USE_SYSTEM_LOGGING_FACILITY)
+#if defined(OS_WINDOWS) || defined(OS_WINCE)
+       /* Windows CE only supports the Unicode version of OutputDebugString. */
+       WCHAR wbuf[USBI_MAX_LOG_LEN];
+       MultiByteToWideChar(CP_UTF8, 0, str, -1, wbuf, sizeof(wbuf));
+       OutputDebugStringW(wbuf);
+#elif defined(HAVE_SYSLOG_FUNC)
+       int syslog_level = LOG_INFO;
+       switch (level) {
+       case LIBUSB_LOG_LEVEL_INFO: syslog_level = LOG_INFO; break;
+       case LIBUSB_LOG_LEVEL_WARNING: syslog_level = LOG_WARNING; break;
+       case LIBUSB_LOG_LEVEL_ERROR: syslog_level = LOG_ERR; break;
+       case LIBUSB_LOG_LEVEL_DEBUG: syslog_level = LOG_DEBUG; break;
+       case LIBUSB_LOG_LEVEL_NONE: break;
+       }
+       syslog(syslog_level, "%s", str);
+#else /* All of gcc, Clang, XCode seem to use #warning */
+#warning System logging is not supported on this platform. Logging to stderr will be used instead.
        fputs(str, stderr);
+#endif
+#else
+       fputs(str, stderr);
+#endif /* USE_SYSTEM_LOGGING_FACILITY */
+       UNUSED(ctx);
+       UNUSED(level);
 }
 
 void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level,
@@ -2084,8 +2111,8 @@ void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level,
        usbi_gettimeofday(&now, NULL);
        if ((global_debug) && (!has_debug_header_been_displayed)) {
                has_debug_header_been_displayed = 1;
-               usbi_log_str(ctx, "[timestamp] [threadID] facility level [function call] <message>\n");
-               usbi_log_str(ctx, "--------------------------------------------------------------------------------\n");
+               usbi_log_str(ctx, LIBUSB_LOG_LEVEL_DEBUG, "[timestamp] [threadID] facility level [function call] <message>\n");
+               usbi_log_str(ctx, LIBUSB_LOG_LEVEL_DEBUG, "--------------------------------------------------------------------------------\n");
        }
        if (now.tv_usec < timestamp_origin.tv_usec) {
                now.tv_sec--;
@@ -2143,7 +2170,7 @@ void usbi_log_v(struct libusb_context *ctx, enum libusb_log_level level,
        }
        strcpy(buf + header_len + text_len, USBI_LOG_LINE_END);
 
-       usbi_log_str(ctx, buf);
+       usbi_log_str(ctx, level, buf);
 #endif
 }