source/modules/ysfx/sources/ysfx_reader.cpp

   1 // Copyright 2021 Jean Pierre Cimalando
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 //
  15 // SPDX-License-Identifier: Apache-2.0
  16 //
  17
  18 #include "ysfx_reader.hpp"
  19
  20 namespace ysfx {
  21
  22 //------------------------------------------------------------------------------
  23 bool text_reader::read_next_line(std::string &line)
  24 {
  25     line.clear();
  26
  27     char next = read_next_char();
  28     if (next == '\0')
  29         return false;
  30
  31     while (next != '\0' && next != '\r' && next != '\n') {
  32         line.push_back(next);
  33         next = read_next_char();
  34     }
  35
  36     if (next == '\r') {
  37         next = peek_next_char();
  38         if (next == '\n')
  39             read_next_char();
  40     }
  41
  42     return true;
  43 }
  44
  45 //------------------------------------------------------------------------------
  46 char string_text_reader::read_next_char()
  47 {
  48     const char *ptr = m_char_ptr;
  49
  50     if (!ptr || *ptr == '\0')
  51         return '\0';
  52
  53     char next = *ptr;
  54     m_char_ptr = ptr + 1;
  55     return next;
  56 }
  57
  58 char string_text_reader::peek_next_char()
  59 {
  60     const char *ptr = m_char_ptr;
  61
  62     if (!ptr)
  63         return '\0';
  64
  65     return *ptr;
  66 }
  67
  68 //------------------------------------------------------------------------------
  69 char stdio_text_reader::read_next_char()
  70 {
  71     FILE *stream = m_stream;
  72
  73     if (!stream)
  74         return '\0';
  75
  76     int next = fgetc(stream);
  77     if (next == EOF)
  78         return '\0';
  79
  80     return (unsigned char)next;
  81 }
  82
  83 char stdio_text_reader::peek_next_char()
  84 {
  85     FILE *stream = m_stream;
  86
  87     if (!stream)
  88         return '\0';
  89
  90     int next = fgetc(stream);
  91     if (next == EOF)
  92         return '\0';
  93
  94     ungetc(next, stream);
  95     return (unsigned char)next;
  96 }
  97
  98 } // namespace ysfx