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-rw-r--r--src/basic/stdio-util.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/src/basic/stdio-util.h b/src/basic/stdio-util.h
new file mode 100644
index 0000000..f647f12
--- /dev/null
+++ b/src/basic/stdio-util.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <printf.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "macro.h"
+#include "memory-util.h"
+
+#define snprintf_ok(buf, len, fmt, ...) \
+ ({ \
+ char *_buf = (buf); \
+ size_t _len = (len); \
+ int _snpf = snprintf(_buf, _len, (fmt), ##__VA_ARGS__); \
+ _snpf >= 0 && (size_t) _snpf < _len ? _buf : NULL; \
+ })
+
+#define xsprintf(buf, fmt, ...) \
+ assert_message_se(snprintf_ok(buf, ELEMENTSOF(buf), fmt, ##__VA_ARGS__), "xsprintf: " #buf "[] must be big enough")
+
+#define VA_FORMAT_ADVANCE(format, ap) \
+do { \
+ int _argtypes[128]; \
+ size_t _i, _k; \
+ /* See https://github.com/google/sanitizers/issues/992 */ \
+ if (HAS_FEATURE_MEMORY_SANITIZER) \
+ zero(_argtypes); \
+ _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \
+ assert(_k < ELEMENTSOF(_argtypes)); \
+ for (_i = 0; _i < _k; _i++) { \
+ if (_argtypes[_i] & PA_FLAG_PTR) { \
+ (void) va_arg(ap, void*); \
+ continue; \
+ } \
+ \
+ switch (_argtypes[_i]) { \
+ case PA_INT: \
+ case PA_INT|PA_FLAG_SHORT: \
+ case PA_CHAR: \
+ (void) va_arg(ap, int); \
+ break; \
+ case PA_INT|PA_FLAG_LONG: \
+ (void) va_arg(ap, long int); \
+ break; \
+ case PA_INT|PA_FLAG_LONG_LONG: \
+ (void) va_arg(ap, long long int); \
+ break; \
+ case PA_WCHAR: \
+ (void) va_arg(ap, wchar_t); \
+ break; \
+ case PA_WSTRING: \
+ case PA_STRING: \
+ case PA_POINTER: \
+ (void) va_arg(ap, void*); \
+ break; \
+ case PA_FLOAT: \
+ case PA_DOUBLE: \
+ (void) va_arg(ap, double); \
+ break; \
+ case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \
+ (void) va_arg(ap, long double); \
+ break; \
+ default: \
+ assert_not_reached(); \
+ } \
+ } \
+} while (false)