3 files changed, 16 insertions, 2 deletions
diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 5ec46d6b7..5a298db5b 100755
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -411,7 +411,7 @@ proc JoinPath*(head, tail: string): string {.
     else:
       result = head & DirSep & tail
 
-proc JoinPath*(parts: openarray[string]): string {.noSideEffect,
+proc JoinPath*(parts: varargs[string]): string {.noSideEffect,
   rtl, extern: "nos$1OpenArray".} =
   ## The same as `JoinPath(head, tail)`, but works with any number
   ## of directory parts.
diff --git a/lib/pure/streams.nim b/lib/pure/streams.nim
index 6e2e19be5..4cd48af31 100755
--- a/lib/pure/streams.nim
+++ b/lib/pure/streams.nim
@@ -194,7 +194,7 @@ proc ssAtEnd(s: PStream): bool =
     
 proc ssSetPosition(s: PStream, pos: int) = 
   var s = PStringStream(s)
-  s.pos = min(pos, s.data.len-1)
+  s.pos = clamp(pos, 0, s.data.high)
 
 proc ssGetPosition(s: PStream): int =
   var s = PStringStream(s)
diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim
index 2509bf689..0f11b4d89 100755
--- a/lib/pure/strutils.nim
+++ b/lib/pure/strutils.nim
@@ -654,6 +654,20 @@ proc find*(s: string, chars: set[char], start: int = 0): int {.noSideEffect,
   for i in start..s.len-1:
     if s[i] in chars: return i
   return -1
+
+proc rfind*(s, sub: string, start: int = -1): int {.noSideEffect.} =
+  ## Searches for `sub` in `s` in reverse, starting at `start` and going
+  ## backwards to 0. Searching is case-sensitive. If `sub` is not in `s`, -1 is
+  ## returned.
+  let realStart = if start == -1: s.len else: start
+  for i in countdown(realStart-sub.len, 0):
+    for j in 0..sub.len-1:
+      result = i
+      if sub[j] != s[i+j]:
+        result = -1
+        break
+    if result != -1: return
+  return -1
 
 proc quoteIfContainsWhite*(s: string): string =
   ## returns ``'"' & s & '"'`` if `s` contains a space and does not