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1 /* |
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2 * Copyright (c) 1999 |
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3 * Silicon Graphics Computer Systems, Inc. |
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4 * |
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5 * Copyright (c) 1999 |
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6 * Boris Fomitchev |
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7 * |
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8 * This material is provided "as is", with absolutely no warranty expressed |
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9 * or implied. Any use is at your own risk. |
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10 * |
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11 * Permission to use or copy this software for any purpose is hereby granted |
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12 * without fee, provided the above notices are retained on all copies. |
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13 * Permission to modify the code and to distribute modified code is granted, |
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14 * provided the above notices are retained, and a notice that the code was |
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15 * modified is included with the above copyright notice. |
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16 * |
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17 */ |
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18 |
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19 // This header is an extension. It defines two streambufs: |
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20 // stdio_istreambuf, a read-only streambuf synchronized with a C stdio |
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21 // FILE object, and stdio_ostreambuf, a write-only streambuf |
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22 // synchronized with a C stdio FILE object. Note that neither |
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23 // stdio_istreambuf nor stdio_ostreambuf is a template; both classes |
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24 // are derived from basic_streambuf<char, char_traits<char> >. |
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25 |
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26 // Note: the imbue() member function is a no-op. In particular, these |
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27 // classes assume that codecvt<char, char, mbstate_t> is always an identity |
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28 // transformation. This is true of the default locale, and of all locales |
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29 // defined for the C I/O library. If you need to use a locale where |
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30 // the codecvt<char, char, mbstate_t> facet performs a nontrivial |
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31 // conversion, then you should use basic_filebuf<> instead of stdio_istreambuf |
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32 // or stdio_ostreambuf. (If you don't understand what any of this means, |
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33 // then it's not a feature you need to worry about. Locales where |
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34 // codecvt<char, char, mbstate_t> does something nontrivial are a rare |
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35 // corner case.) |
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36 |
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37 |
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38 #ifndef _STLP_STDIO_STREAMBUF |
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39 #define _STLP_STDIO_STREAMBUF |
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40 |
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41 #include <streambuf> |
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42 #include <cstdio> // For FILE. |
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43 |
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44 _STLP_BEGIN_NAMESPACE |
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45 _STLP_MOVE_TO_PRIV_NAMESPACE |
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46 |
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47 // Base class for features common to stdio_istreambuf and stdio_ostreambuf |
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48 class stdio_streambuf_base : |
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49 public basic_streambuf<char, char_traits<char> > /* FILE_basic_streambuf */ { |
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50 public: // Constructor, destructor. |
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51 // The argument may not be null. It must be an open file pointer. |
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52 stdio_streambuf_base(FILE*); |
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53 |
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54 // The destructor flushes the stream, but does not close it. |
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55 ~stdio_streambuf_base(); |
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56 |
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57 protected: // Virtual functions from basic_streambuf. |
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58 streambuf* setbuf(char*, streamsize); |
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59 |
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60 pos_type seekoff(off_type, ios_base::seekdir, |
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61 ios_base::openmode |
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62 = ios_base::in | ios_base::out); |
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63 pos_type seekpos(pos_type, |
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64 ios_base::openmode |
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65 = ios_base::in | ios_base::out); |
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66 int sync(); |
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67 |
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68 protected: |
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69 FILE* _M_file; |
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70 }; |
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71 |
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72 class stdio_istreambuf : public stdio_streambuf_base { |
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73 public: // Constructor, destructor. |
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74 stdio_istreambuf(FILE* __f) : stdio_streambuf_base(__f) {} |
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75 ~stdio_istreambuf(); |
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76 |
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77 protected: // Virtual functions from basic_streambuf. |
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78 streamsize showmanyc(); |
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79 int_type underflow(); |
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80 int_type uflow(); |
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81 virtual int_type pbackfail(int_type c = traits_type::eof()); |
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82 }; |
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83 |
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84 class stdio_ostreambuf : public stdio_streambuf_base { |
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85 public: // Constructor, destructor. |
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86 stdio_ostreambuf(FILE* __f) : stdio_streambuf_base(__f) {} |
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87 ~stdio_ostreambuf(); |
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88 |
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89 protected: // Virtual functions from basic_streambuf. |
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90 streamsize showmanyc(); |
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91 int_type overflow(int_type c = traits_type::eof()); |
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92 }; |
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93 |
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94 _STLP_MOVE_TO_STD_NAMESPACE |
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95 _STLP_END_NAMESPACE |
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96 |
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97 #endif /* _STLP_STDIO_STREAMBUF */ |
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98 |
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99 // Local Variables: |
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100 // mode:C++ |
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101 // End: |