Make improvements

third_party/gdtoa/g__fmt.c

@@ -0,0 +1,200 @@
+#include "third_party/gdtoa/gdtoaimp.h"
+
+/* clang-format off */
+/****************************************************************
+
+The author of this software is David M. Gay.
+
+Copyright (C) 1998 by Lucent Technologies
+All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appear in all
+copies and that both that the copyright notice and this
+permission notice and warranty disclaimer appear in supporting
+documentation, and that the name of Lucent or any of its entities
+not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
+IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
+SPECIAL, 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.
+
+****************************************************************/
+
+/* Please send bug reports to David M. Gay (dmg at acm dot org,
+ * with " at " changed at "@" and " dot " changed to ".").	*/
+
+#ifndef ldus_QNAN0
+#define ldus_QNAN0 0x7fff
+#endif
+#ifndef ldus_QNAN1
+#define ldus_QNAN1 0xc000
+#endif
+#ifndef ldus_QNAN2
+#define ldus_QNAN2 0
+#endif
+#ifndef ldus_QNAN3
+#define ldus_QNAN3 0
+#endif
+#ifndef ldus_QNAN4
+#define ldus_QNAN4 0
+#endif
+
+ const char *const InfName[6] = { "Infinity", "infinity", "INFINITY", "Inf", "inf", "INF" };
+ const char *const NanName[3] = { "NaN", "nan", "NAN" };
+ const ULong NanDflt_Q_D2A[4] = { 0xffffffff, 0xffffffff, 0xffffffff, 0x7fffffff };
+ const ULong NanDflt_d_D2A[2] = { d_QNAN1, d_QNAN0 };
+ const ULong NanDflt_f_D2A[1] = { f_QNAN };
+ const ULong NanDflt_xL_D2A[3] = { 1, 0x80000000, 0x7fff0000 };
+ const UShort NanDflt_ldus_D2A[5] = { ldus_QNAN4, ldus_QNAN3, ldus_QNAN2, ldus_QNAN1, ldus_QNAN0 };
+
+ char *
+#ifdef KR_headers
+g__fmt(b, s, se, decpt, sign, blen) char *b; char *s; char *se; int decpt; ULong sign; size_t blen;
+#else
+g__fmt(char *b, char *s, char *se, int decpt, ULong sign, size_t blen)
+#endif
+{
+	int i, j, k;
+	char *be, *s0;
+	size_t len;
+#ifdef USE_LOCALE
+#ifdef NO_LOCALE_CACHE
+	char *decimalpoint = localeconv()->decimal_point;
+	size_t dlen = strlen(decimalpoint);
+#else
+	char *decimalpoint;
+	static char *decimalpoint_cache;
+	static size_t dlen;
+	if (!(s0 = decimalpoint_cache)) {
+		s0 = localeconv()->decimal_point;
+		dlen = strlen(s0);
+		if ((decimalpoint_cache = (char*)MALLOC(strlen(s0) + 1))) {
+			strcpy(decimalpoint_cache, s0);
+			s0 = decimalpoint_cache;
+			}
+		}
+	decimalpoint = s0;
+#endif
+#else
+#define dlen 0
+#endif
+	s0 = s;
+	len = (se-s) + dlen + 6; /* 6 = sign + e+dd + trailing null */
+	if (blen < len)
+		goto ret0;
+	be = b + blen - 1;
+	if (sign)
+		*b++ = '-';
+	if (decpt <= -4 || decpt > se - s + 5) {
+		*b++ = *s++;
+		if (*s) {
+#ifdef USE_LOCALE
+			while((*b = *decimalpoint++))
+				++b;
+#else
+			*b++ = '.';
+#endif
+			while((*b = *s++) !=0)
+				b++;
+			}
+		*b++ = 'e';
+		/* sprintf(b, "%+.2d", decpt - 1); */
+		if (--decpt < 0) {
+			*b++ = '-';
+			decpt = -decpt;
+			}
+		else
+			*b++ = '+';
+		for(j = 2, k = 10; 10*k <= decpt; j++, k *= 10){}
+		for(;;) {
+			i = decpt / k;
+			if (b >= be)
+				goto ret0;
+			*b++ = i + '0';
+			if (--j <= 0)
+				break;
+			decpt -= i*k;
+			decpt *= 10;
+			}
+		*b = 0;
+		}
+	else if (decpt <= 0) {
+#ifdef USE_LOCALE
+		while((*b = *decimalpoint++))
+			++b;
+#else
+		*b++ = '.';
+#endif
+		if (be < b - decpt + (se - s))
+			goto ret0;
+		for(; decpt < 0; decpt++)
+			*b++ = '0';
+		while((*b = *s++) != 0)
+			b++;
+		}
+	else {
+		while((*b = *s++) != 0) {
+			b++;
+			if (--decpt == 0 && *s) {
+#ifdef USE_LOCALE
+				while(*b = *decimalpoint++)
+					++b;
+#else
+				*b++ = '.';
+#endif
+				}
+			}
+		if (b + decpt > be) {
+ ret0:
+			b = 0;
+			goto ret;
+			}
+		for(; decpt > 0; decpt--)
+			*b++ = '0';
+		*b = 0;
+		}
+ ret:
+	freedtoa(s0);
+	return b;
+ 	}
+
+ char *
+add_nanbits_D2A(char *b, size_t blen, ULong *bits, int nb)
+{
+	ULong t;
+	char *rv;
+	int i, j;
+	size_t L;
+	static char Hexdig[16] = "0123456789abcdef";
+
+	while(!bits[--nb])
+		if (!nb)
+			return b;
+	L = 8*nb + 3;
+	t = bits[nb];
+	do ++L; while((t >>= 4));
+	if (L > blen)
+		return b;
+	b += L;
+	*--b = 0;
+	rv = b;
+	*--b = /*(*/ ')';
+	for(i = 0; i < nb; ++i) {
+		t = bits[i];
+		for(j = 0; j < 8; ++j, t >>= 4)
+			*--b = Hexdig[t & 0xf];
+		}
+	t = bits[nb];
+	do *--b = Hexdig[t & 0xf]; while(t >>= 4);
+	*--b = '('; /*)*/
+	return rv;
+	}