Add DL::Importable::Internal::Struct#alloc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/dl/lib/dl/struct.rb

@@ -74,14 +74,19 @@ module DL
 	  return @names
 	end
 
-	def new(size = nil)
+	# ptr must be a PtrData object.
+	def new(ptr)
+	  ptr.struct!(@tys, *@names)
+	  mem = Memory.new(ptr, @names, @ty, @len, @enc, @dec)
+	  return mem
+	end
+
+	def alloc(size = nil)
 	  if( !size )
 	    size = @size
 	  end
 	  ptr = DL::malloc(size)
-	  ptr.struct!(@tys, *@names)
-	  mem = Memory.new(ptr, @names, @ty, @len, @enc, @dec)
-	  return mem
+	  return new(ptr)
 	end
 
 	def parse(contents)

ext/dl/sample/libc.rb

@@ -1,64 +1,42 @@
-require 'dl'
+require "dl/import"
+require "dl/struct"
 
 module LIBC
+  extend DL::Importable
+
   begin
-    LIB = DL.dlopen('libc.so.6')
-  rescue RuntimeError
-    LIB = DL.dlopen('libc.so.5')
+    dlload "libc.so.6"
+  rescue
+    dlload "libc.so.5"
   end
 
-  SYM = {
-    :atoi    => LIB['atoi', 'IS'],
-    :isdigit => LIB['isdigit', 'II'],
-  }
+  extern "int atoi(char*)"
+  extern "ibool isdigit(int)"
+  extern "int gettimeofday(struct timeval *, struct timezone *)"
+  extern "char* strcat(char*, char*)"
+  extern "FILE* fopen(char*, char*)"
+  extern "int fclose(FILE*)"
+  extern "int fgetc(FILE*)"
+  extern "int strlen(char*)"
+  extern "void qsort(void*, int, int, void*)"
 
-  def atoi(str)
-    r,rs = SYM[:atoi].call(str)
-    return r
+  def str_qsort(ary, comp)
+    len = ary.length
+    r,rs = qsort(ary, len, DL.sizeof('P'), comp)
+    return rs[0].to_a('S', len)
   end
 
-  def isdigit(c)
-    r,rs = SYM[:isdigit].call(c)
-    return (r != 0)
-  end
+  Timeval = struct [
+    "long tv_sec",
+    "long tv_usec",
+  ]
+
+  Timezone = struct [
+    "int tz_minuteswest",
+    "int tz_dsttime",
+  ]
 end
 
-module LIBC
-  SYM[:strcat] = LIB['strcat', 'SsS']
-  def strcat(str1,str2)
-    r,rs = SYM[:strcat].call(str1 + "\0#{str2}",str2)
-    return rs[0]
-  end
-end
-
-module LIBC
-  SYM[:fopen] = LIB['fopen', 'PSS']
-  SYM[:fclose] = LIB['fclose', '0P']
-  SYM[:fgetc] = LIB['fgetc', 'IP']
-
-  def fopen(filename, mode)
-    r,rs = SYM[:fopen].call(filename, mode)
-    return r
-  end
-
-  def fclose(ptr)
-    SYM[:fclose].call(ptr)
-    return nil
-  end
-
-  def fgetc(ptr)
-    r,rs = SYM[:fgetc].call(ptr)
-    return r
-  end
-end
-
-module LIBC
-  SYM[:strlen] = LIB['strlen', 'IP']
-  def strlen(str)
-    r,rs = SYM[:strlen].call(str)
-    return r
-  end
-end
 
 $cb1 = DL.set_callback('IPP', 0){|ptr1, ptr2|
   str1 = ptr1.ptr.to_s
@@ -66,19 +44,21 @@ $cb1 = DL.set_callback('IPP', 0){|ptr1, ptr2|
   str1 <=> str2
 }
 
-module LIBC
-  SYM[:qsort] = LIB['qsort', '0aIIP']
-  def qsort(ary, comp)
-    len = ary.length
-    r,rs = SYM[:qsort].call(ary, len, DL.sizeof('P'), comp)
-    return rs[0].to_a('S', len)
-  end
-end
+p LIBC.atoi("10")
 
-include LIBC
+p LIBC.isdigit(?1)
 
-p atoi("10")
-p isdigit(?1)
-p isdigit(?a)
-p strcat("a", "b")
-p qsort(["a","c","b"],$cb1)
+p LIBC.isdigit(?a)
+
+p LIBC.strcat("a", "b")
+
+ary = ["a","c","b"]
+ptr = ary.to_ptr
+LIBC.qsort(ptr, ary.length, DL.sizeof('P'), $cb1)
+p ptr.to_a('S', ary.length)
+
+tv = LIBC::Timeval.alloc
+tz = LIBC::Timezone.alloc
+LIBC.gettimeofday(tv, tz)
+
+p Time.at(tv.tv_sec)