Add ecvt(), fcvt() and gcvt() for standard compliance and legacy code.

1 files changed, 110 insertions, 0 deletions

diff --git a/lib/libc/stdlib/ecvt.c b/lib/libc/stdlib/ecvt.c
new file mode 100644
index 00000000000..7460407c84a
--- /dev/null
+++ b/lib/libc/stdlib/ecvt.c
@@ -0,0 +1,110 @@
+/*	$OpenBSD: ecvt.c,v 1.1 2002/12/02 15:38:54 millert Exp $	*/
+
+/*
+ * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$OpenBSD: ecvt.c,v 1.1 2002/12/02 15:38:54 millert Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern char *__dtoa(double, int, int, int *, int *, char **);
+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;
+	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 (*decpt == 9999) {
+			/* Nan or Infinity */
+			*decpt = 0;
+			return(p);
+		}
+		/* make a local copy and adjust rve to be in terms of s */
+		if (pad && fmode)
+			siz += *decpt;
+		if ((s = (char *)malloc(siz)) == NULL)
+			return(NULL);
+		(void) strlcpy(s, p, siz);
+		rve = s + (rve - p);
+	}
+
+	/* Add trailing zeros (unless we got NaN or Inf) */
+	if (pad && *decpt != 9999) {
+		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));
+}