+#include <errno.h>
+
+/*****************************************************************************/
+
+/* _nm_utils_ascii_str_to_int64:
+ *
+ * A wrapper for g_ascii_strtoll, that checks whether the whole string
+ * can be successfully converted to a number and is within a given
+ * range. On any error, @fallback will be returned and %errno will be set
+ * to a non-zero value. On success, %errno will be set to zero, check %errno
+ * for errors. Any trailing or leading (ascii) white space is ignored and the
+ * functions is locale independent.
+ *
+ * The function is guaranteed to return a value between @min and @max
+ * (inclusive) or @fallback. Also, the parsing is rather strict, it does
+ * not allow for any unrecognized characters, except leading and trailing
+ * white space.
+ **/
+gint64
+_nm_utils_ascii_str_to_int64 (const char *str, guint base, gint64 min, gint64 max, gint64 fallback)
+{
+ gint64 v;
+ size_t len;
+ char buf[64], *s, *str_free = NULL;
+
+ if (str) {
+ while (g_ascii_isspace (str[0]))
+ str++;
+ }
+ if (!str || !str[0]) {
+ errno = EINVAL;
+ return fallback;
+ }
+
+ len = strlen (str);
+ if (g_ascii_isspace (str[--len])) {
+ /* backward search the first non-ws character.
+ * We already know that str[0] is non-ws. */
+ while (g_ascii_isspace (str[--len]))
+ ;
+
+ /* str[len] is now the last non-ws character... */
+ len++;
+
+ if (len >= sizeof (buf))
+ s = str_free = g_malloc (len + 1);
+ else
+ s = buf;
+
+ memcpy (s, str, len);
+ s[len] = 0;
+
+ nm_assert (len > 0 && len < strlen (str) && len == strlen (s));
+ nm_assert (!g_ascii_isspace (str[len-1]) && g_ascii_isspace (str[len]));
+ nm_assert (strncmp (str, s, len) == 0);
+
+ str = s;
+ }
+
+ errno = 0;
+ v = g_ascii_strtoll (str, &s, base);
+
+ if (errno != 0)
+ v = fallback;
+ else if (s[0] != 0) {
+ errno = EINVAL;
+ v = fallback;
+ } else if (v > max || v < min) {
+ errno = ERANGE;
+ v = fallback;
+ }
+
+ if (G_UNLIKELY (str_free))
+ g_free (str_free);
+ return v;
+}
+
+/*****************************************************************************/