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commit e996e91ca5951c50769dcaa8e074daa973006849
Author: Natanael Copa <ncopa@alpinelinux.org>
Date: Thu Jul 8 06:39:36 2010 +0000
add ecvt() implementation
diff --git a/lib/string/Makefile.am b/lib/string/Makefile.am
index 1edab81..5f2e7ab 100644
--- a/lib/string/Makefile.am
+++ b/lib/string/Makefile.am
@@ -23,6 +23,7 @@ libString_la_SOURCES += bsd_vsnprintf.c
libString_la_SOURCES += bsd_vsnwprintf.c
libString_la_SOURCES += convertutf.c
libString_la_SOURCES += str.c
+libString_la_SOURCES += ecvt.c
AM_CFLAGS = @LIB_STRING_CPPFLAGS@
diff --git a/lib/string/bsd_output_shared.c b/lib/string/bsd_output_shared.c
index 3616947..321d6f1 100644
--- a/lib/string/bsd_output_shared.c
+++ b/lib/string/bsd_output_shared.c
@@ -64,6 +64,9 @@
#ifndef NO_FLOATING_POINT
+extern char* ecvt(double arg, int ndigits, int *decptp, int *signp);
+extern char* fcvt(double arg, int ndigits, int *decptp, int *signp);
+
/*
*-----------------------------------------------------------------------------
*
diff --git a/lib/string/ecvt.c b/lib/string/ecvt.c
new file mode 100644
index 0000000..1979c3d
--- /dev/null
+++ b/lib/string/ecvt.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * ecvt converts to decimal
+ * the number of digits is specified by ndigit
+ * decptp is set to the position of the decimal point
+ * signp is set to 0 for positive, 1 for negative
+ */
+
+
+static double ecvt_rint(double x);
+
+static char *cvt();
+
+/* big enough to handle %.20f conversion of 1e308 */
+#define NDIG 350
+
+char*
+ecvt(arg, ndigits, decptp, signp)
+double arg;
+int ndigits, *decptp, *signp;
+{
+ return(cvt(arg, ndigits, decptp, signp, 1));
+}
+
+char*
+fcvt(arg, ndigits, decptp, signp)
+double arg;
+int ndigits, *decptp, *signp;
+{
+ return(cvt(arg, ndigits, decptp, signp, 0));
+}
+
+static char*
+cvt(arg, ndigits, decptp, signp, eflag)
+double arg;
+int ndigits, *decptp, *signp;
+int eflag;
+{
+ register int decpt;
+ double fi, fj;
+ register char *p, *p1;
+ static char buf[NDIG] = { 0 };
+ double modf();
+
+ if (ndigits < 0)
+ ndigits = 0;
+ if (ndigits >= NDIG-1)
+ ndigits = NDIG-2;
+
+ decpt = 0;
+ *signp = 0;
+ p = &buf[0];
+
+ if (arg == 0) {
+ *decptp = 0;
+ while (p < &buf[ndigits])
+ *p++ = '0';
+ *p = '\0';
+ return(buf);
+ } else if (arg < 0) {
+ *signp = 1;
+ arg = -arg;
+ }
+
+ arg = modf(arg, &fi);
+ p1 = &buf[NDIG];
+
+ /*
+ * Do integer part
+ */
+ if (fi != 0) {
+ while (fi != 0) {
+ fj = modf(fi/10, &fi);
+ /**--p1 = (int)((fj+.03)*10) + '0';*/
+ *--p1 = (int)ecvt_rint((fj)*10) + '0';
+ decpt++;
+ }
+ while (p1 < &buf[NDIG])
+ *p++ = *p1++;
+ } else if (arg > 0) {
+ while ((fj = arg*10) < 1) {
+ arg = fj;
+ decpt--;
+ }
+ }
+ *decptp = decpt;
+
+ /*
+ * do fraction part
+ * p pts to where fraction should be concatenated
+ * p1 is how far conversion must go to
+ */
+ p1 = &buf[ndigits];
+ if (eflag==0) {
+ /* fcvt must provide ndigits after decimal pt */
+ p1 += decpt;
+ /* if decpt was negative, we might done for fcvt */
+ if (p1 < &buf[0]) {
+ buf[0] = '\0';
+ return(buf);
+ }
+ }
+ while (p <= p1 && p < &buf[NDIG]) {
+ arg *= 10;
+ arg = modf(arg, &fj);
+ *p++ = (int)fj + '0';
+ }
+ /*
+ * if we converted all the way to the end of the
+ * buf, don't mess with rounding since there's nothing
+ * significant out here anyway
+ */
+ if (p1 >= &buf[NDIG]) {
+ buf[NDIG-1] = '\0';
+ return(buf);
+ }
+ /*
+ * round by adding 5 to last digit and propagating
+ * carries
+ */
+ p = p1;
+ *p1 += 5;
+ while (*p1 > '9') {
+ *p1 = '0';
+ if (p1 > buf)
+ ++*--p1;
+ else {
+ *p1 = '1';
+ (*decptp)++;
+ if (eflag == 0) {
+ if (p > buf)
+ *p = '0';
+ p++;
+ }
+ }
+ }
+ *p = '\0';
+ return(buf);
+}
+
+static double ecvt_rint(double x)
+{
+ asm("frndint" : "=t" (x) : "0" (x));
+ return(x);
+}
+
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