1 files changed, 91 insertions, 24 deletions
diff --git a/Master/texmf-dist/tex/context/base/l-io.lua b/Master/texmf-dist/tex/context/base/l-io.lua
index 66e279309fb..a740996c68c 100644
--- a/Master/texmf-dist/tex/context/base/l-io.lua
+++ b/Master/texmf-dist/tex/context/base/l-io.lua
@@ -6,7 +6,10 @@ if not modules then modules = { } end modules ['l-io'] = {
     license   = "see context related readme files"
 }
 
-local byte, find, gsub = string.byte, string.find, string.gsub
+local io = io
+local byte, find, gsub, format = string.byte, string.find, string.gsub, string.format
+local concat = table.concat
+local type = type
 
 if string.find(os.getenv("PATH"),";") then
     io.fileseparator, io.pathseparator = "\\", ";"
@@ -17,9 +20,7 @@ end
 function io.loaddata(filename,textmode)
     local f = io.open(filename,(textmode and 'r') or 'rb')
     if f then
-    --  collectgarbage("step") -- sometimes makes a big difference in mem consumption
         local data = f:read('*all')
-    --  garbagecollector.check(data)
         f:close()
         return data
     else
@@ -31,13 +32,14 @@ function io.savedata(filename,data,joiner)
     local f = io.open(filename,"wb")
     if f then
         if type(data) == "table" then
-            f:write(table.join(data,joiner or ""))
+            f:write(concat(data,joiner or ""))
         elseif type(data) == "function" then
             data(f)
         else
             f:write(data or "")
         end
         f:close()
+        io.flush()
         return true
     else
         return false
@@ -66,12 +68,19 @@ function io.size(filename)
 end
 
 function io.noflines(f)
-    local n = 0
-    for _ in f:lines() do
-        n = n + 1
+    if type(f) == "string" then
+        local f = io.open(filename)
+        local n = f and io.noflines(f) or 0
+        assert(f:close())
+        return n
+    else
+        local n = 0
+        for _ in f:lines() do
+            n = n + 1
+        end
+        f:seek('set',0)
+        return n
     end
-    f:seek('set',0)
-    return n
 end
 
 local nextchar = {
@@ -97,8 +106,6 @@ local nextchar = {
 function io.characters(f,n)
     if f then
         return nextchar[n or 1], f
-    else
-        return nil, nil
     end
 end
 
@@ -107,40 +114,42 @@ local nextbyte = {
         local a, b, c, d = f:read(1,1,1,1)
         if d then
             return byte(a), byte(b), byte(c), byte(d)
-        else
-            return nil, nil, nil, nil
+        end
+    end,
+    [3] = function(f)
+        local a, b, c = f:read(1,1,1)
+        if b then
+            return byte(a), byte(b), byte(c)
         end
     end,
     [2] = function(f)
         local a, b = f:read(1,1)
         if b then
             return byte(a), byte(b)
-        else
-            return nil, nil
         end
     end,
     [1] = function (f)
         local a = f:read(1)
         if a then
             return byte(a)
-        else
-            return nil
         end
     end,
     [-2] = function (f)
         local a, b = f:read(1,1)
         if b then
             return byte(b), byte(a)
-        else
-            return nil, nil
+        end
+    end,
+    [-3] = function(f)
+        local a, b, c = f:read(1,1,1)
+        if b then
+            return byte(c), byte(b), byte(a)
         end
     end,
     [-4] = function(f)
         local a, b, c, d = f:read(1,1,1,1)
         if d then
             return byte(d), byte(c), byte(b), byte(a)
-        else
-            return nil, nil, nil, nil
         end
     end
 }
@@ -157,12 +166,13 @@ function io.ask(question,default,options)
     while true do
         io.write(question)
         if options then
-            io.write(string.format(" [%s]",table.concat(options,"|")))
+            io.write(format(" [%s]",concat(options,"|")))
         end
         if default then
-            io.write(string.format(" [%s]",default))
+            io.write(format(" [%s]",default))
         end
-        io.write(string.format(" "))
+        io.write(format(" "))
+        io.flush()
         local answer = io.read()
         answer = gsub(answer,"^%s*(.*)%s*$","%1")
         if answer == "" and default then
@@ -185,3 +195,60 @@ function io.ask(question,default,options)
         end
     end
 end
+
+local function readnumber(f,n,m)
+    if m then
+        f:seek("set",n)
+        n = m
+    end
+    if n == 1 then
+        return byte(f:read(1))
+    elseif n == 2 then
+        local a, b = byte(f:read(2),1,2)
+        return 256 * a + b
+    elseif n == 3 then
+        local a, b, c = byte(f:read(3),1,3)
+        return 256*256 * a + 256 * b + c
+    elseif n == 4 then
+        local a, b, c, d = byte(f:read(4),1,4)
+        return 256*256*256 * a + 256*256 * b + 256 * c + d
+    elseif n == 8 then
+        local a, b = readnumber(f,4), readnumber(f,4)
+        return 256 * a + b
+    elseif n == 12 then
+        local a, b, c = readnumber(f,4), readnumber(f,4), readnumber(f,4)
+        return 256*256 * a + 256 * b + c
+    elseif n == -2 then
+        local b, a = byte(f:read(2),1,2)
+        return 256*a + b
+    elseif n == -3 then
+        local c, b, a = byte(f:read(3),1,3)
+        return 256*256 * a + 256 * b + c
+    elseif n == -4 then
+        local d, c, b, a = byte(f:read(4),1,4)
+        return 256*256*256 * a + 256*256 * b + 256*c + d
+    elseif n == -8 then
+        local h, g, f, e, d, c, b, a = byte(f:read(8),1,8)
+        return 256*256*256*256*256*256*256 * a +
+                   256*256*256*256*256*256 * b +
+                       256*256*256*256*256 * c +
+                           256*256*256*256 * d +
+                               256*256*256 * e +
+                                   256*256 * f +
+                                       256 * g +
+                                             h
+    else
+        return 0
+    end
+end
+
+io.readnumber = readnumber
+
+function io.readstring(f,n,m)
+    if m then
+        f:seek("set",n)
+        n = m
+    end
+    local str = gsub(f:read(n),"%z","")
+    return str
+end