Preserve errno.

According to C99:
"The  functions  atof,  atoi,  atol, and atoll need not
affect the value of  the  integer  expression  errno  on  an
error.   If  the  value of the result cannot be represented,
the behavior is undefined."

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/libc/stdlib/atof.c b/lib/libc/stdlib/atof.c
index 130e285..e6dffa9 100644
--- a/lib/libc/stdlib/atof.c
+++ b/lib/libc/stdlib/atof.c
@@ -29,18 +29,26 @@
  * 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.
+ *
+ * $FreeBSD$
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)atof.c	8.1 (Berkeley) 6/4/93";
 #endif /* LIBC_SCCS and not lint */
 
+#include <errno.h>
 #include <stdlib.h>
-#include <stddef.h>
 
 double
 atof(ascii)
 	const char *ascii;
 {
-	return (strtod(ascii, NULL));
+	double r;
+	int saverr;
+
+	saverr = errno;
+	r = strtod(ascii, (char **)NULL);
+	errno = saverr;
+	return r;
 }