1 files changed, 67 insertions, 0 deletions
diff --git a/src/path.c b/src/path.c
index bfd21b426c..eaa4b87a02 100644
--- a/src/path.c
+++ b/src/path.c
@@ -1694,3 +1694,70 @@ int same_directory(char_u *f1, char_u *f2)
          && pathcmp((char *)ffname, (char *)f2, (int)(t1 - ffname)) == 0;
 }
 
+#if !defined(NO_EXPANDPATH) || defined(PROTO)
+/*
+ * Compare path "p[]" to "q[]".
+ * If "maxlen" >= 0 compare "p[maxlen]" to "q[maxlen]"
+ * Return value like strcmp(p, q), but consider path separators.
+ */
+int pathcmp(const char *p, const char *q, int maxlen)
+{
+  int i;
+  int c1, c2;
+  const char  *s = NULL;
+
+  for (i = 0; maxlen < 0 || i < maxlen; i += MB_PTR2LEN((char_u *)p + i)) {
+    c1 = PTR2CHAR((char_u *)p + i);
+    c2 = PTR2CHAR((char_u *)q + i);
+
+    /* End of "p": check if "q" also ends or just has a slash. */
+    if (c1 == NUL) {
+      if (c2 == NUL)        /* full match */
+        return 0;
+      s = q;
+      break;
+    }
+
+    /* End of "q": check if "p" just has a slash. */
+    if (c2 == NUL) {
+      s = p;
+      break;
+    }
+
+    if ((p_fic ? MB_TOUPPER(c1) != MB_TOUPPER(c2) : c1 != c2)
+#ifdef BACKSLASH_IN_FILENAME
+        /* consider '/' and '\\' to be equal */
+        && !((c1 == '/' && c2 == '\\')
+             || (c1 == '\\' && c2 == '/'))
+#endif
+        ) {
+      if (vim_ispathsep(c1))
+        return -1;
+      if (vim_ispathsep(c2))
+        return 1;
+      return p_fic ? MB_TOUPPER(c1) - MB_TOUPPER(c2)
+             : c1 - c2;         /* no match */
+    }
+  }
+  if (s == NULL)        /* "i" ran into "maxlen" */
+    return 0;
+
+  c1 = PTR2CHAR((char_u *)s + i);
+  c2 = PTR2CHAR((char_u *)s + i + MB_PTR2LEN((char_u *)s + i));
+  /* ignore a trailing slash, but not "//" or ":/" */
+  if (c2 == NUL
+      && i > 0
+      && !after_pathsep((char_u *)s, (char_u *)s + i)
+#ifdef BACKSLASH_IN_FILENAME
+      && (c1 == '/' || c1 == '\\')
+#else
+      && c1 == '/'
+#endif
+      )
+    return 0;       /* match with trailing slash */
+  if (s == q)
+    return -1;              /* no match */
+  return 1;
+}
+#endif
+