1 files changed, 99 insertions, 0 deletions
diff --git a/liblog_use_syslog.c b/liblog_use_syslog.c
new file mode 100644
index 0000000..09b6ca9
--- /dev/null
+++ b/liblog_use_syslog.c
@@ -0,0 +1,99 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#if defined(__clang__)
+# pragma clang diagnostic ignored "-Wassign-enum"
+#endif
+
+int
+liblog_use_syslog(struct liblog_context *ctx, const char *prefixfmt, int use_backtrace)
+{
+	void *new;
+	size_t old_noutputs = ctx->noutputs;
+	struct liblog_output output = {
+		.userdata = NULL,
+		.prefixfmt = prefixfmt,
+		.lowest_verbosity_unlimited = 1U,
+		.highest_verbosity_unlimited = 0U,
+		.use_backtrace = (use_backtrace ? 1U : 0U),
+		.lowest_verbosity = 0,
+		.highest_verbosity = LIBLOG_ALERT - 1,
+		.sink_type = LIBLOG_SYSLOG,
+		.sink.syslog.level = LOG_EMERG
+	};
+
+	if (!ctx) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (ctx->noutputs > SIZE_MAX / sizeof(*ctx->outputs) - 8)
+		goto enomem;
+	new = realloc(ctx->outputs, (ctx->noutputs + 8) * sizeof(*ctx->outputs));
+	if (!new) {
+	enomem:
+		errno = ENOMEM;
+		return -1;
+	}
+	ctx->outputs = new;
+
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity_unlimited = 0;
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_CRITICAL - 1;
+	output.sink.syslog.level = LOG_ALERT;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_ERROR - 1;
+	output.sink.syslog.level = LOG_CRIT;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_WARNING - 1;
+	output.sink.syslog.level = LOG_ERR;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_NOTICE - 1;
+	output.sink.syslog.level = LOG_WARNING;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_INFO - 1;
+	output.sink.syslog.level = LOG_NOTICE;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity = LIBLOG_TRACE - 1;
+	output.sink.syslog.level = LOG_INFO;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	output.lowest_verbosity = output.highest_verbosity + 1;
+	output.highest_verbosity_unlimited = 1;
+	output.sink.syslog.level = LOG_DEBUG;
+	if (liblog_use_output(ctx, &output))
+		goto fail;
+
+	return 0;
+
+fail:
+	while (ctx->noutputs > old_noutputs)
+		liblog_destroy_output(&ctx->outputs[--ctx->noutputs]);
+	return -1;
+}
+
+#else
+
+int main(void) {return 0;} /* TODO test */
+
+#endif