Libc-498.tar.gz

[apple/libc.git] / stdlib / ecvt-obsd.c

diff --git a/stdlib/ecvt-obsd.c b/stdlib/ecvt-obsd.c
new file mode 100644 (file)
index 0000000..0a1e095
--- /dev/null
+++ b/stdlib/ecvt-obsd.c
@@ -0,0 +1,110 @@
+/*     $OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 millert Exp $        */
+
+/*
+ * Copyright (c) 2002 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 <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+static char rcsid[] = "$OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 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 **);
+extern void __freedtoa(char *); /* special gdtoa free function */
+static char *__cvt(double, int, int *, int *, int, int);
+
+static char *
+__cvt(double value, int ndigit, int * __restrict decpt, int * __restrict 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;
+                       rve = (*p == 'N') ? "nan" : "inf";
+                       __freedtoa(p);
+                       return(rve);
+               }
+               /* 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 (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 * __restrict decpt, int * __restrict sign)
+{
+       return(__cvt(value, ndigit, decpt, sign, 0, 1));
+}
+
+char *
+fcvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
+{
+       return(__cvt(value, ndigit, decpt, sign, 1, 1));
+}