1 files changed, 44 insertions, 2 deletions
diff --git a/libiberty/strverscmp.c b/libiberty/strverscmp.c
index 59ec5d2bc..0a005db2a 100644
--- a/libiberty/strverscmp.c
+++ b/libiberty/strverscmp.c
@@ -1,2 +1,44 @@
-/* empty translation unit for build system compatibility */
-typedef int dummy;
+/* strverscmp from musl. Copyright © 2005-2015 Rich Felker, et al.
+   Released under the MIT license.
+   See http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT?id=eceaf1d29f32656e5befb5e37b1f7db632f2e1dc for details. */
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <string.h>
+
+int strverscmp(const char *l, const char *r)
+{
+	int haszero=1;
+	while (*l==*r) {
+		if (!*l) return 0;
+
+		if (*l=='0') {
+			if (haszero==1) {
+				haszero=0;
+			}
+		} else if (isdigit(*l)) {
+			if (haszero==1) {
+				haszero=2;
+			}
+		} else {
+			haszero=1;
+		}
+		l++; r++;
+	}
+	if (haszero==1 && (*l=='0' || *r=='0')) {
+		haszero=0;
+	}
+	if ((isdigit(*l) && isdigit(*r) ) && haszero) {
+		size_t lenl=0, lenr=0;
+		while (isdigit(l[lenl]) ) lenl++;
+		while (isdigit(r[lenr]) ) lenr++;
+		if (lenl==lenr) {
+			return (*l -  *r);
+		} else if (lenl>lenr) {
+			return 1;
+		} else {
+			return -1;
+		}
+	} else {
+		return (*l -  *r);
+	}
+}