Libc-997.90.3.tar.gz

[apple/libc.git] / stdlib / OpenBSD / gcvt.c

diff --git a/stdlib/OpenBSD/gcvt.c b/stdlib/OpenBSD/gcvt.c
index 9fd664b346c6d8d1a541bd21c03f702ea4a2cfc2..703f78315461b7d6ef21accf85791dcb4d6fff28 100644 (file)
--- a/stdlib/OpenBSD/gcvt.c
+++ b/stdlib/OpenBSD/gcvt.c
@@ -1,7 +1,7 @@
-/*     $OpenBSD: gcvt.c,v 1.5 2003/06/17 21:56:24 millert Exp $        */
+/*     $OpenBSD: gcvt.c,v 1.11 2009/10/16 12:15:03 martynas Exp $      */
 
 /*
- * Copyright (c) 2002, 2003 Todd C. Miller <Todd.Miller@courtesan.com>
+ * Copyright (c) 2002, 2003, 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
@@ -20,31 +20,38 @@
  * Materiel Command, USAF, under agreement number F39502-99-1-0512.
  */
 
-#if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: gcvt.c,v 1.5 2003/06/17 21:56:24 millert Exp $";
-#endif /* LIBC_SCCS and not lint */
-
+#include <locale.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 extern char *__dtoa(double, int, int, int *, int *, char **);
+extern void  __freedtoa(char *);
 
 char *
 gcvt(double value, int ndigit, char *buf)
 {
        char *digits, *dst, *src;
        int i, decpt, sign;
+       struct lconv *lconv;
 
+       lconv = localeconv();
        if (ndigit == 0) {
                buf[0] = '\0';
                return (buf);
        }
 
        digits = __dtoa(value, 2, ndigit, &decpt, &sign, NULL);
+       if (digits == NULL)
+               return (NULL);
        if (decpt == 9999) {
-               /* Infinity or NaN, assume buffer is at least ndigit long. */
-               strlcpy(buf, digits, ndigit + 1);
+               /*
+                * Infinity or NaN, convert to inf or nan with sign.
+                * We assume the buffer is at least ndigit long.
+                */
+               snprintf(buf, ndigit + 1, "%s%s", sign ? "-" : "",
+                   *digits == 'I' ? "inf" : "nan");
+               __freedtoa(digits);
                return (buf);
        }
 
@@ -53,13 +60,16 @@ gcvt(double value, int ndigit, char *buf)
                *dst++ = '-';
 
        if (decpt < 0 || decpt > ndigit) {
-               /* exponential format */
+               /* exponential format (e.g. 1.2345e+13) */
                if (--decpt < 0) {
                        sign = 1;
                        decpt = -decpt;
                } else
                        sign = 0;
-               for (src = digits; *src != '\0'; )
+               src = digits;
+               *dst++ = *src++;
+               dst = stpcpy(dst, lconv->decimal_point);
+               while (*src != '\0')
                        *dst++ = *src++;
                *dst++ = 'e';
                if (sign)
@@ -73,7 +83,8 @@ gcvt(double value, int ndigit, char *buf)
                } else {
                        /* XXX - optimize */
                        for (sign = decpt, i = 0; (sign /= 10) != 0; i++)
-                               sign /= 10;
+                               continue;
+                       dst[i + 1] = '\0';
                        while (decpt != 0) {
                                dst[i--] = '0' + decpt % 10;
                                decpt /= 10;
@@ -88,12 +99,15 @@ gcvt(double value, int ndigit, char *buf)
                                *dst++ = '0';
                }
                if (*src != '\0') {
-                       *dst++ = '.';           /* XXX - locale-specific (LC_NUMERIC) */
+                       if (src == digits)
+                               *dst++ = '0';   /* zero before decimal point */
+                       dst = stpcpy(dst, lconv->decimal_point);
                        for (i = decpt; digits[i] != '\0'; i++) {
                                *dst++ = digits[i];
                        }
                }
                *dst = '\0';
        }
+       __freedtoa(digits);
        return (buf);
 }