initial import of the C runtime

src/runtime/c/gu/assert.c

@@ -0,0 +1,53 @@
+#include <gu/assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+const char*
+gu_assert_mode_descs[] = {
+	[GU_ASSERT_PRECOND] = "precondition failed",
+	[GU_ASSERT_POSTCOND] = "postcondition failed",
+	[GU_ASSERT_ASSERTION] = "assertion failed",
+	[GU_ASSERT_NEVER] = "control should not reach here",
+};
+
+void
+gu_abort_v_(GuAssertMode mode,
+	    const char* file, const char* func, int line,
+	    const char* msg_fmt, va_list args)
+{
+	const char* desc = gu_assert_mode_descs[mode];
+	(void) fprintf(stderr, "%s (%s:%d): %s\n", func, file, line, desc);
+	if (msg_fmt != NULL) {
+		(void) fputc('\t', stderr);
+		(void) vfprintf(stderr, msg_fmt, args);
+		(void) fputc('\n', stderr);
+	}
+	abort();
+}
+
+void
+gu_abort_(GuAssertMode mode,
+	  const char* file, const char* func, int line,
+	  const char* msg_fmt, ...)
+{
+	va_list args;
+	va_start(args, msg_fmt);
+	gu_abort_v_(mode, file, func, line, msg_fmt, args);
+	va_end(args);
+}
+	
+
+void 
+gu_fatal(const char* fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	fputs("Fatal error", stderr);
+	if (fmt) {
+		fputs(": ", stderr);
+		(void) vfprintf(stderr, fmt, args);
+	}
+	fputc('\n', stderr);
+	abort();
+}