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, 9 insertions, 2 deletions

diff --git a/lib/libc/stdlib/atoi.c b/lib/libc/stdlib/atoi.c
index 48e508a..8e98a96e7 100644
--- a/lib/libc/stdlib/atoi.c
+++ b/lib/libc/stdlib/atoi.c
@@ -29,18 +29,25 @@
  * 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[] = "@(#)atoi.c	8.1 (Berkeley) 6/4/93";
 #endif /* LIBC_SCCS and not lint */
 
+#include <errno.h>
 #include <stdlib.h>
-#include <stddef.h>
 
 int
 atoi(str)
 	const char *str;
 {
-	return((int)strtol(str, (char **)NULL, 10));
+	int r, saverr;
+
+	saverr = errno;
+	r = (int)strtol(str, (char **)NULL, 10);
+	errno = saverr;
+	return r;
 }