lib/simple-file-storage.cc

   1 /*
   2   simple-file-storage.cc -- implement Simple_file_storage
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include <stdio.h>
  10
  11 #include "file-storage.hh"
  12 #include "varray.hh"
  13 #include "string.hh"
  14 #include "warn.hh"
  15
  16 /**
  17   Stupid but foolproof way of opening files.
  18
  19   TODO
  20   Should check IO status
  21
  22   This is of course a build it yourself version of mmap, so we should
  23   have been using that... (see Mapped_file_storage) But we noticed
  24   some problems with this (unexplained lexer crashes)
  25
  26   [Some versions later] The crashes aren't caused by the mmap
  27   code. But no reason to take it out, is there?  */
  28
  29 Simple_file_storage::Simple_file_storage(String s)
  30 {
  31   data_p_ =0;
  32
  33   /*
  34     let's hope that "b" opens anything binary, and does not apply
  35     CR/LF translation
  36     */
  37   FILE * f =  (s.length_i ()) ?  fopen (s.ch_C(), "rb") : stdin;
  38
  39   if (!f)
  40     {
  41       warning(_("can't open file `") + s + "'");
  42       return ;
  43     }
  44
  45   int ret = fseek(f, 0, SEEK_END);
  46   len_i_ = ftell(f);
  47   rewind(f);
  48   data_p_ = new char[len_i_+1];
  49   data_p_[len_i_] = 0;
  50   ret = fread(data_p_, sizeof(char), len_i_, f);
  51
  52
  53   if  (ret!=len_i_)
  54     warning (_("Huh? got ") + String(ret) + _(", expected ")
  55              + String(len_i_) + _(" characters"));
  56
  57   if (f != stdin)
  58     fclose(f);
  59 }
  60
  61 char const*
  62 Simple_file_storage::ch_C() const
  63 {
  64   return data_p_;
  65 }
  66
  67 int
  68 Simple_file_storage::length_i() const
  69 {
  70   return len_i_;
  71 }
  72
  73
  74 Simple_file_storage::~Simple_file_storage()
  75 {
  76   delete []data_p_;
  77 }