Description: include/strutils: Add ul_strtou64() function
Origin: backport, https://github.com/util-linux/util-linux/commit/84825b161ba5d18da4142893b9789b3fc71284d9
Author: Salvatore Bonaccorso <carnil@debian.org>

--- a/include/strutils.h
+++ b/include/strutils.h
@@ -16,6 +16,8 @@ extern int parse_size(const char *str, u
 extern int strtosize(const char *str, uintmax_t *res);
 extern uintmax_t strtosize_or_err(const char *str, const char *errmesg);
 
+extern int ul_strtou64(const char *str, uint64_t *num, int base);
+
 extern int16_t strtos16_or_err(const char *str, const char *errmesg);
 extern uint16_t strtou16_or_err(const char *str, const char *errmesg);
 extern uint16_t strtox16_or_err(const char *str, const char *errmesg);
--- a/lib/strutils.c
+++ b/lib/strutils.c
@@ -319,6 +319,20 @@ char *strndup(const char *s, size_t n)
 }
 #endif
 
+int ul_strtou64(const char *str, uint64_t *num, int base)
+{
+	char *end = NULL;
+
+	errno = 0;
+	if (str == NULL || *str == '\0')
+		return -EINVAL;
+	*num = (uint64_t) strtoumax(str, &end, base);
+
+	if (errno || str == end || (end && *end))
+		return -EINVAL;
+	return 0;
+}
+
 static uint32_t _strtou32_or_err(const char *str, const char *errmesg, int base);
 static uint64_t _strtou64_or_err(const char *str, const char *errmesg, int base);