1 files changed, 121 insertions, 0 deletions
diff --git a/liblog_vxlog.c b/liblog_vxlog.c
new file mode 100644
index 0000000..4093c59
--- /dev/null
+++ b/liblog_vxlog.c
@@ -0,0 +1,121 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+#if defined(__GNUC__)
+# pragma GCC diagnostic ignored "-Wformat-nonliteral"
+#endif
+
+static int
+ensure_fit(struct messagebuf *msg, size_t extent)
+{
+	size_t new_size;
+	void *new;
+	if (extent >= msg->size - msg->len) {
+		new_size = msg->len + extent + 1;
+		new = realloc(msg->text, new_size);
+		if (!new)
+			return -1;
+		msg->text = new;
+		msg->size = new_size;
+	}
+	return 0;
+}
+
+int
+liblog_vxlog(struct liblog_context *ctx, enum liblog_level level, unsigned flags, const char *fmt, va_list args)
+{
+	/* TODO optionally avoid allocating and deallocating for each call */
+	/* TODO respect logmask */
+
+	struct messagebuf msgbuf = MESSAGEBUF_INIT, *msg;
+	int corked;
+	size_t old_len;
+
+	if (!ctx || (level & (enum liblog_level)~0x001F)) {
+	einval:
+		errno = EINVAL;
+		return -1;
+	}
+	if (!fmt && !(flags & (XLOG_NOT_INLINE - 1U) & LIBLOG_XLOG_NO_TEXT))
+		goto einval;
+	if ((flags & (LIBLOG_XLOG_CORK | LIBLOG_XLOG_UNCORK)) == (LIBLOG_XLOG_CORK | LIBLOG_XLOG_UNCORK))
+		goto einval;
+	if ((flags & (LIBLOG_XLOG_BACKTRACE | LIBLOG_XLOG_NO_BACKTRACE)) == (LIBLOG_XLOG_BACKTRACE | LIBLOG_XLOG_NO_BACKTRACE))
+		goto einval;
+
+	msg = ctx->internal_state ? &ctx->internal_state->msg : &msgbuf;
+	corked = !!msg->prefix;
+	old_len = msg->len;
+
+	/* TODO ctx->internal_state must be allocated */
+
+	if (!msg->prefix) {
+		/* TODO implement: prefix */
+	}
+
+	if (!(flags & LIBLOG_XLOG_NO_BACKTRACE)) {
+		if (flags & LIBLOG_XLOG_BACKTRACE) {
+			unsigned levels = (flags / XLOG_NOT_INLINE) + 1U;
+			if (liblog_trace__(&msg->text, &msg->len, &msg->size, (size_t)levels, NULL))
+				return -1;
+		}
+	}
+
+	if (!(flags & LIBLOG_XLOG_NO_TEXT)) {
+		int len;
+		va_list args2;
+		va_copy(args2, args);
+		len = snprintf(NULL, 0, fmt, args2);
+		va_end(args2);
+		if (len < 0)
+			return -1;
+		if (ensure_fit(msg, (size_t)len))
+			return -1;
+		if (snprintf(&msg->text[msg->len], (size_t)len + 1, fmt, args) != len)
+			abort();
+		msg->len += (size_t)len;
+	}
+
+	if (flags & LIBLOG_XLOG_UNCORK) {
+		if (msg == &ctx->internal_state->msg) {
+			memcpy(&msgbuf, msg, sizeof(*msg));
+			ctx->internal_state->msg = MESSAGEBUF_INIT;
+			msg = &msgbuf;
+		}
+		goto output;
+	} else if (flags & LIBLOG_XLOG_CORK) {
+		if (msg != &ctx->internal_state->msg)
+			memcpy(&ctx->internal_state->msg, msg, sizeof(*msg));
+	} else if (corked) {
+		/* do nothing, internal state already set */
+	} else {
+	output:
+		if (msg->len && msg->text[msg->len - 1] != '\n') {
+			if (ensure_fit(msg, 0))
+				goto fail;
+			msg->text[msg->len++] = '\n';
+		}
+		if (liblog_flush__(ctx, msg))
+			goto fail;
+		free(msg->prefix);
+		free(msg->text);
+		*msg = MESSAGEBUF_INIT;
+	}
+
+	return 0;
+
+fail:
+	if (msg != &ctx->internal_state->msg) {
+		free(msg->prefix);
+		free(msg->text);
+	}
+	msg->len = old_len;
+	return -1;
+}
+
+#else
+
+int main(void) {return 0;} /* TODO test */
+
+#endif