1 files changed, 24 insertions, 20 deletions

diff --git a/src/lib/libc/stdlib/strtoul.c b/src/lib/libc/stdlib/strtoul.c
index 00f7210fa1..d3b363fa04 100644
--- a/src/lib/libc/stdlib/strtoul.c
+++ b/src/lib/libc/stdlib/strtoul.c
@@ -32,13 +32,12 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-/*static char *sccsid = "from: @(#)strtoul.c    5.3 (Berkeley) 2/23/91";*/
-static char *rcsid = "$Id: strtoul.c,v 1.1.1.1 1995/10/18 08:42:20 deraadt Exp $";
+static char *rcsid = "$OpenBSD: strtoul.c,v 1.4 1996/08/19 08:33:52 tholo Exp $";
 #endif /* LIBC_SCCS and not lint */
 
-#include <limits.h>
 #include <ctype.h>
 #include <errno.h>
+#include <limits.h>
 #include <stdlib.h>
 
 /*
@@ -53,23 +52,26 @@ strtoul(nptr, endptr, base)
         char **endptr;
         register int base;
 {
-        register const char *s = nptr;
-        register unsigned long acc;
+        register const char *s;
+        register unsigned long acc, cutoff;
         register int c;
-        register unsigned long cutoff;
-        register int neg = 0, any, cutlim;
+        register int neg, any, cutlim;
 
         /*
          * See strtol for comments as to the logic used.
          */
+        s = nptr;
         do {
-                c = *s++;
+                c = (unsigned char) *s++;
         } while (isspace(c));
         if (c == '-') {
                 neg = 1;
                 c = *s++;
-        } else if (c == '+')
-                c = *s++;
+        } else {
+                neg = 0;
+                if (c == '+')
+                        c = *s++;
+        }
         if ((base == 0 || base == 16) &&
             c == '0' && (*s == 'x' || *s == 'X')) {
                 c = s[1];
@@ -78,9 +80,10 @@ strtoul(nptr, endptr, base)
         }
         if (base == 0)
                 base = c == '0' ? 8 : 10;
-        cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
-        cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
-        for (acc = 0, any = 0;; c = *s++) {
+
+        cutoff = ULONG_MAX / (unsigned long)base;
+        cutlim = ULONG_MAX % (unsigned long)base;
+        for (acc = 0, any = 0;; c = (unsigned char) *s++) {
                 if (isdigit(c))
                         c -= '0';
                 else if (isalpha(c))
@@ -89,18 +92,19 @@ strtoul(nptr, endptr, base)
                         break;
                 if (c >= base)
                         break;
-                if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim)
+                if (any < 0)
+                        continue;
+                if (acc > cutoff || acc == cutoff && c > cutlim) {
                         any = -1;
-                else {
+                        acc = ULONG_MAX;
+                        errno = ERANGE;
+                } else {
                         any = 1;
-                        acc *= base;
+                        acc *= (unsigned long)base;
                         acc += c;
                 }
         }
-        if (any < 0) {
-                acc = ULONG_MAX;
-                errno = ERANGE;
-        } else if (neg)
+        if (neg && any > 0)
                 acc = -acc;
         if (endptr != 0)
                 *endptr = (char *) (any ? s - 1 : nptr);