3 files changed, 12 insertions, 14 deletions
diff --git a/examples/httpserver2.nim b/examples/httpserver2.nim
index 050684d3e..1843ff967 100644
--- a/examples/httpserver2.nim
+++ b/examples/httpserver2.nim
@@ -107,7 +107,7 @@ proc executeCgi(server: var TServer, client: Socket, path, query: string,
       dataAvail = recvLine(client, buf)
       if buf.len == 0:
         break
-      var L = toLower(buf)
+      var L = toLowerAscii(buf)
       if L.startsWith("content-length:"):
         var i = len("content-length:")
         while L[i] in Whitespace: inc(i)
@@ -205,7 +205,7 @@ proc acceptRequest(server: var TServer, client: Socket) =
     client.close()
   else:
     when defined(Windows):
-      var ext = splitFile(path).ext.toLower
+      var ext = splitFile(path).ext.toLowerAscii
       if ext == ".exe" or ext == ".cgi":
         # XXX: extract interpreter information here?
         cgi = true
diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 11be8f0c1..644afee32 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -1060,18 +1060,17 @@ proc parseCmdLine*(c: string): seq[string] {.
   while true:
     setLen(a, 0)
     # eat all delimiting whitespace
-    while c[i] == ' ' or c[i] == '\t' or c[i] == '\l' or c[i] == '\r' : inc(i)
+    while i < c.len and c[i] in {' ', '\t', '\l', '\r'}: inc(i)
+    if i >= c.len: break
     when defined(windows):
       # parse a single argument according to the above rules:
-      if c[i] == '\0': break
       var inQuote = false
-      while true:
+      while i < c.len:
         case c[i]
-        of '\0': break
         of '\\':
           var j = i
-          while c[j] == '\\': inc(j)
-          if c[j] == '"':
+          while j < c.len and c[j] == '\\': inc(j)
+          if j < c.len and c[j] == '"':
             for k in 1..(j-i) div 2: a.add('\\')
             if (j-i) mod 2 == 0:
               i = j
@@ -1084,7 +1083,7 @@ proc parseCmdLine*(c: string): seq[string] {.
         of '"':
           inc(i)
           if not inQuote: inQuote = true
-          elif c[i] == '"':
+          elif i < c.len and c[i] == '"':
             a.add(c[i])
             inc(i)
           else:
@@ -1102,13 +1101,12 @@ proc parseCmdLine*(c: string): seq[string] {.
       of '\'', '\"':
         var delim = c[i]
         inc(i) # skip ' or "
-        while c[i] != '\0' and c[i] != delim:
+        while i < c.len and c[i] != delim:
           add a, c[i]
           inc(i)
-        if c[i] != '\0': inc(i)
-      of '\0': break
+        if i < c.len: inc(i)
       else:
-        while c[i] > ' ':
+        while i < c.len and c[i] > ' ':
           add(a, c[i])
           inc(i)
     add(result, a)
diff --git a/lib/pure/pegs.nim b/lib/pure/pegs.nim
index 90a460776..6d415efd0 100644
--- a/lib/pure/pegs.nim
+++ b/lib/pure/pegs.nim
@@ -606,7 +606,7 @@ proc rawMatch*(s: string, p: Peg, start: int, c: var Captures): int {.
       a, b: Rune
     result = start
     while i < len(p.term):
-      if i >= s.len:
+      if result >= s.len:
         result = -1
         break
       fastRuneAt(p.term, i, a)