Fix compile error on OpenBSD

src/common.cpp

@@ -648,6 +648,16 @@ void format_long_safe(wchar_t buff[64], long val) {
     }
 }
 
+void format_llong_safe(wchar_t buff[64], long long val) {
+    unsigned long long uval = absolute_value(val);
+    if (val >= 0) {
+        format_safe_impl(buff, 64, uval);
+    } else {
+        buff[0] = '-';
+        format_safe_impl(buff + 1, 63, uval);
+    }
+}
+
 void format_ullong_safe(wchar_t buff[64], unsigned long long val) {
     return format_safe_impl(buff, 64, val);
 }

src/common.h

@@ -329,6 +329,7 @@ void format_size_safe(char buff[128], unsigned long long sz);
 /// Writes out a long safely.
 void format_long_safe(char buff[64], long val);
 void format_long_safe(wchar_t buff[64], long val);
+void format_llong_safe(wchar_t buff[64], long long val);
 void format_ullong_safe(wchar_t buff[64], unsigned long long val);
 
 /// "Narrows" a wide character string. This just grabs any ASCII characters and trunactes.

src/wcstringutil.h

@@ -139,6 +139,12 @@ inline wcstring to_string(long x) {
     return wcstring(buff);
 }
 
+inline wcstring to_string(long long x) {
+    wchar_t buff[64];
+    format_llong_safe(buff, x);
+    return wcstring(buff);
+}
+
 inline wcstring to_string(unsigned long long x) {
     wchar_t buff[64];
     format_ullong_safe(buff, x);