X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=src%2Futil.c;h=60bab76acbb7abcc03c2aaaa1795d5ea497e19c2;hb=41c221c509deed7dc9c2bd8eb8c7e93563b21199;hp=54e29444655ada8905f3ca5f377a89e099821dbd;hpb=e3a7c6c725964662f4ad1fcfe21d2da742499b8a;p=wimlib

diff --git a/src/util.c b/src/util.c
index 54e29444..60bab76a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -66,6 +66,8 @@ utf16le_strlen(const utf16lechar *s)
 
 #ifdef ENABLE_ERROR_MESSAGES
 bool wimlib_print_errors = false;
+FILE *wimlib_error_file = NULL; /* Set in wimlib_global_init() */
+static bool wimlib_owns_error_file = false;
 #endif
 
 #if defined(ENABLE_ERROR_MESSAGES) || defined(ENABLE_DEBUG)
@@ -79,8 +81,8 @@ wimlib_vmsg(const tchar *tag, const tchar *format,
 	{
 		int errno_save = errno;
 		fflush(stdout);
-		tfputs(tag, stderr);
-		tvfprintf(stderr, format, va);
+		tfputs(tag, wimlib_error_file);
+		tvfprintf(wimlib_error_file, format, va);
 		if (perror && errno_save != 0) {
 			tchar buf[64];
 			int res;
@@ -94,10 +96,10 @@ wimlib_vmsg(const tchar *tag, const tchar *format,
 			if (errno_save == EBUSY)
 				tstrcpy(buf, T("Resource busy"));
 		#endif
-			tfprintf(stderr, T(": %"TS), buf);
+			tfprintf(wimlib_error_file, T(": %"TS), buf);
 		}
-		tputc(T('\n'), stderr);
-		fflush(stderr);
+		tputc(T('\n'), wimlib_error_file);
+		fflush(wimlib_error_file);
 		errno = errno_save;
 	}
 }
@@ -187,6 +189,42 @@ wimlib_set_print_errors(bool show_error_messages)
 #endif
 }
 
+WIMLIBAPI int
+wimlib_set_error_file(FILE *fp)
+{
+#ifdef ENABLE_ERROR_MESSAGES
+	if (wimlib_owns_error_file)
+		fclose(wimlib_error_file);
+	wimlib_error_file = fp;
+	wimlib_print_errors = (fp != NULL);
+	wimlib_owns_error_file = false;
+	return 0;
+#else
+	return WIMLIB_ERR_UNSUPPORTED;
+#endif
+}
+
+WIMLIBAPI int
+wimlib_set_error_file_by_name(const tchar *path)
+{
+#ifdef ENABLE_ERROR_MESSAGES
+	FILE *fp;
+
+#ifdef __WIN32__
+	fp = win32_open_logfile(path);
+#else
+	fp = fopen(path, "a");
+#endif
+	if (!fp)
+		return WIMLIB_ERR_OPEN;
+	wimlib_set_error_file(fp);
+	wimlib_owns_error_file = true;
+	return 0;
+#else
+	return WIMLIB_ERR_UNSUPPORTED;
+#endif
+}
+
 static const tchar *error_strings[] = {
 	[WIMLIB_ERR_SUCCESS]
 		= T("Success"),