From 72f8c0a17cfce2339403a7d93abe2a317a0a6fd6 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Sat, 26 Sep 1998 19:11:23 +0000
Subject: [PATCH] (__xstrtol) [STRING_TO_UNSIGNED]: Return LONGINT_INVALID for
 strings that begin with `-'.

---
 lib/xstrtol.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/xstrtol.c b/lib/xstrtol.c
index 00d4b11..f4ba50b 100644
--- a/lib/xstrtol.c
+++ b/lib/xstrtol.c
@@ -69,6 +69,18 @@ extern int errno;
 # define LONG_MAX TYPE_MAXIMUM (long int)
 #endif
 
+#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
+# define IN_CTYPE_DOMAIN(c) 1
+#else
+# define IN_CTYPE_DOMAIN(c) isascii(c)
+#endif
+
+#ifdef isblank
+# define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
+#else
+# define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#endif
+
 #include "xstrtol.h"
 
 __unsigned long int __strtol ();
@@ -107,6 +119,18 @@ __xstrtol (const char *s, char **ptr, int strtol_base,
 
   p = (ptr ? ptr : &t_ptr);
 
+#if STRING_TO_UNSIGNED
+  {
+    const char *q = s;
+    while (ISBLANK (*q))
+      {
+	++q;
+      }
+    if (*q == '-')
+      return LONGINT_INVALID;
+  }
+#endif
+
   errno = 0;
   tmp = __strtol (s, p, strtol_base);
   if (errno != 0)
-- 
2.7.4