flower/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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <stdio.h>
  10
  11 #ifndef SEEK_END
  12 #define SEEK_END 2
  13 #endif
  14
  15 #include "simple-file-storage.hh"
  16 #include "array.hh"
  17 #include "string.hh"
  18 #include "warn.hh"
  19
  20 void
  21 Simple_file_storage::load_stdin ()
  22 {
  23   len_i_ = 0;
  24
  25   int c;
  26   Array<char> ch_arr;
  27   while ((c = fgetc (stdin)) != EOF)
  28     ch_arr.push (c);
  29   len_i_ = ch_arr.size ();
  30   data_p_ = ch_arr.remove_array_p ();
  31 }
  32
  33 void
  34 Simple_file_storage::load_file (String s)
  35 {
  36   /*
  37     let's hope that "b" opens anything binary, and does not apply
  38     CR/LF translation
  39     */
  40   FILE * f =  fopen (s.ch_C (), "rb");
  41
  42   if (!f)
  43     {
  44       warning (_f ("can't open file: `%s'", s));
  45       return ;
  46     }
  47
  48   int ret = fseek (f, 0, SEEK_END);
  49   len_i_ = ftell (f);
  50   rewind (f);
  51   data_p_ = new char[len_i_+1];
  52   data_p_[len_i_] = 0;
  53   ret = fread (data_p_, sizeof (char), len_i_, f);
  54
  55   if  (ret!=len_i_)
  56     warning (_f ("Huh?  Got %d, expected %d characters", ret, len_i_));
  57
  58   fclose (f);
  59 }
  60
  61 /**
  62   Stupid but foolproof way of opening files.
  63
  64   TODO
  65   Should check IO status
  66
  67   This is of course a build it yourself version of mmap, so we should
  68   have been using that..., but this is simple & portable
  69
  70 */
  71
  72 Simple_file_storage::Simple_file_storage (String s)
  73 {
  74   data_p_ = 0;
  75   len_i_ = 0;
  76
  77   if (!s.length_i () || (s == "-"))
  78     load_stdin ();
  79   else
  80     load_file (s);
  81 }
  82
  83 char const*
  84 Simple_file_storage::ch_C () const
  85 {
  86   return data_p_;
  87 }
  88
  89 int
  90 Simple_file_storage::length_i () const
  91 {
  92   return len_i_;
  93 }
  94
  95
  96 Simple_file_storage::~Simple_file_storage ()
  97 {
  98   delete []data_p_;
  99 }