cutils: Add qemu_strtoul() wrapper

Add wrapper for strtoul() function. Include unit tests.

Signed-off-by: Carlos L. Torres <carlos.torres@rackspace.com>
Message-Id: <9621b4ae8e35fded31c715c2ae2a98f904f07ad0.1437346779.git.carlos.torres@rackspace.com>
[Fix tests for 32-bit build. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/util/cutils.c b/util/cutils.c
index 3330360abf..8ee3d5ee9d 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -416,6 +416,38 @@ int qemu_strtol(const char *nptr, const char **endptr, int base,
     }
     return err;
 }
+
+/**
+ * Converts ASCII string to an unsigned long integer.
+ *
+ * If string contains a negative number, value will be converted to
+ * the unsigned representation of the signed value, unless the original
+ * (nonnegated) value would overflow, in this case, it will set @result
+ * to ULONG_MAX, and return ERANGE.
+ *
+ * The same behavior holds, for qemu_strtoull() but sets @result to
+ * ULLONG_MAX instead of ULONG_MAX.
+ *
+ * See qemu_strtol() documentation for more info.
+ */
+int qemu_strtoul(const char *nptr, const char **endptr, int base,
+                 unsigned long *result)
+{
+    char *p;
+    int err = 0;
+    if (!nptr) {
+        if (endptr) {
+            *endptr = nptr;
+        }
+        err = -EINVAL;
+    } else {
+        errno = 0;
+        *result = strtoul(nptr, &p, base);
+        err = check_strtox_error(endptr, p, errno);
+    }
+    return err;
+}
+
 /**
  * parse_uint:
  *