1 files changed, 106 insertions, 0 deletions

diff --git a/src/lib/libc/stdlib/ecvt.c b/src/lib/libc/stdlib/ecvt.c
new file mode 100644
index 0000000000..4562e309e8
--- /dev/null
+++ b/src/lib/libc/stdlib/ecvt.c
@@ -0,0 +1,106 @@
+/*      $OpenBSD: ecvt.c,v 1.8 2013/11/01 19:05:11 guenther Exp $       */
+
+/*
+ * Copyright (c) 2002, 2006 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, 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.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "gdtoa.h"
+
+static char *__cvt(double, int, int *, int *, int, int);
+
+static char *
+__cvt(double value, int ndigit, int *decpt, int *sign, int fmode, int pad)
+{
+        static char *s;
+        char *p, *rve, c;
+        size_t siz;
+
+        if (ndigit == 0) {
+                *sign = value < 0.0;
+                *decpt = 0;
+                return ("");
+        }
+
+        if (s) {
+                free(s);
+                s = NULL;
+        }
+
+        if (ndigit < 0)
+                siz = -ndigit + 1;
+        else
+                siz = ndigit + 1;
+
+
+        /* __dtoa() doesn't allocate space for 0 so we do it by hand */
+        if (value == 0.0) {
+                *decpt = 1 - fmode;     /* 1 for 'e', 0 for 'f' */
+                *sign = 0;
+                if ((rve = s = (char *)malloc(siz)) == NULL)
+                        return(NULL);
+                *rve++ = '0';
+                *rve = '\0';
+        } else {
+                p = __dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
+                if (p == NULL)
+                        return (NULL);
+                if (*decpt == 9999) {
+                        /* Infinity or Nan, convert to inf or nan like printf */
+                        *decpt = 0;
+                        c = *p;
+                        __freedtoa(p);
+                        return(c == 'I' ? "inf" : "nan");
+                }
+                /* Make a local copy and adjust rve to be in terms of s */
+                if (pad && fmode)
+                        siz += *decpt;
+                if ((s = (char *)malloc(siz)) == NULL) {
+                        __freedtoa(p);
+                        return(NULL);
+                }
+                (void) strlcpy(s, p, siz);
+                rve = s + (rve - p);
+                __freedtoa(p);
+        }
+
+        /* Add trailing zeros */
+        if (pad) {
+                siz -= rve - s;
+                while (--siz)
+                        *rve++ = '0';
+                *rve = '\0';
+        }
+
+        return(s);
+}
+
+char *
+ecvt(double value, int ndigit, int *decpt, int *sign)
+{
+        return(__cvt(value, ndigit, decpt, sign, 0, 1));
+}
+
+char *
+fcvt(double value, int ndigit, int *decpt, int *sign)
+{
+        return(__cvt(value, ndigit, decpt, sign, 1, 1));
+}