Solve the error logging situation

1 files changed, 83 insertions, 0 deletions

diff --git a/src/errmsg.h b/src/errmsg.h
new file mode 100644
index 0000000..17a4457
--- /dev/null
+++ b/src/errmsg.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef INC_ERRMSG_H
+#define INC_ERRMSG_H
+
+#include "con_.h"
+#include "os.h"
+
+extern const char msg_note[], msg_warn[], msg_error[];
+
+#define _ERRMSG_STR1(x) #x
+#define _ERRMSG_STR(x) _ERRMSG_STR1(x)
+
+#ifdef MODULE_NAME
+#define _errmsg_msg(mod, msg, s, ...) \
+	con_warn("sst: %s: %s" s ": %s\n", mod, msg, __VA_ARGS__)
+// XXX: can we avoid using the ##__VA_ARGS__ extension here somehow?
+#define _errmsg_msgx(mod, msg, s, ...) \
+	con_warn("sst: %s: %s" s "\n", mod, msg, ##__VA_ARGS__)
+#else
+// dumb hack: we don't want sst.c to say "sst: sst:" - easier to just drop the
+// module parameter here so all the stuff below can just remain the same
+#define _errmsg_msg(ignored, msg, s, ...) \
+	con_warn("sst: %s" s ": %s\n", msg, __VA_ARGS__)
+#define _errmsg_msgx(ignored, msg, s, ...) \
+	con_warn("sst: %s" s "\n", msg, ##__VA_ARGS__)
+#endif
+
+#define _errmsg_std(msg, ...) \
+	_errmsg_msg(_ERRMSG_STR(MODULE_NAME), msg, __VA_ARGS__, strerror(errno))
+
+#define _errmsg_x(msg, ...) \
+	_errmsg_msgx(_ERRMSG_STR(MODULE_NAME), msg, __VA_ARGS__)
+
+#ifdef _WIN32
+#define _errmsg_sys(msg, ...) do { \
+	char _warnsys_buf[512]; \
+	OS_WINDOWS_ERROR(_warnsys_buf); \
+	_errmsg_msg(_ERRMSG_STR(MODULE_NAME), msg, __VA_ARGS__, _warnsys_buf); \
+} while (0)
+#define _errmsg_dl _errmsg_sys
+#else
+#define _errmsg_sys _errmsg_std
+static inline const char *_errmsg_dlerror(void) {
+	const char *e = dlerror();
+	if (!e) return "Unknown error"; // just in case, better avoid weirdness!
+	return e;
+}
+#define _errmsg_dl(msg, ...) \
+	_errmsg_msg(_ERRMSG_STR(MODULE_NAME), msg, __VA_ARGS__, _errmsg_dlerror());
+#endif
+
+// Reminder: will need add warnsock/errsock if we ever do stuff with sockets,
+// because of Windows's WSAGetLastError() abomination.
+#define errmsg_warnstd(...) _errmsg_std(msg_warn, __VA_ARGS__)
+#define errmsg_warnsys(...) _errmsg_sys(msg_warn, __VA_ARGS__)
+#define errmsg_warndl(...) _errmsg_dl(msg_warn, __VA_ARGS__)
+#define errmsg_warnx(...) _errmsg_x(msg_warn, __VA_ARGS__)
+
+#define errmsg_errorstd(...) _errmsg_std(msg_error, __VA_ARGS__)
+#define errmsg_errorsys(...) _errmsg_sys(msg_error, __VA_ARGS__)
+#define errmsg_errordl(...) _errmsg_dl(msg_error, __VA_ARGS__)
+#define errmsg_errorx(...) _errmsg_x(msg_error, __VA_ARGS__)
+
+#define errmsg_note(...) _errmsg_x(msg_note, __VA_ARGS__)
+
+#endif
+
+// vi: sw=4 ts=4 noet tw=80 cc=80