Add an internal 'libcommon' for utils

[lttng-ust.git] / src / common / snprintf / floatio.h

diff --git a/src/common/snprintf/floatio.h b/src/common/snprintf/floatio.h
new file mode 100644 (file)
index 0000000..deaa193
--- /dev/null
+++ b/src/common/snprintf/floatio.h
@@ -0,0 +1,41 @@
+/*     $OpenBSD: floatio.h,v 1.4 2008/09/07 20:36:08 martynas Exp $    */
+
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (C) 1990, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ */
+
+/*
+ * Floating point scanf/printf (input/output) definitions.
+ */
+
+/* 11-bit exponent (VAX G floating point) is 308 decimal digits */
+#define        MAXEXP          308
+/* 128 bit fraction takes up 39 decimal digits; max reasonable precision */
+#define        MAXFRACT        39
+
+/*
+ * MAXEXPDIG is the maximum number of decimal digits needed to store a
+ * floating point exponent in the largest supported format.  It should
+ * be ceil(log10(LDBL_MAX_10_EXP)) or, if hexadecimal floating point
+ * conversions are supported, ceil(log10(LDBL_MAX_EXP)).  But since it
+ * is presently never greater than 5 in practice, we fudge it.
+ */
+#define        MAXEXPDIG       6
+#if LDBL_MAX_EXP > 999999
+#error "floating point buffers too small"
+#endif
+
+char *__hdtoa(double, const char *, int, int *, int *, char **)
+       __attribute__((visibility("hidden")));
+
+char *__hldtoa(long double, const char *, int, int *, int *, char **)
+       __attribute__((visibility("hidden")));
+
+char *__ldtoa(long double *, int, int, int *, int *, char **)
+       __attribute__((visibility("hidden")));