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annotate packages/language/c/libc/stdio/current/src/input/fgetc.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===========================================================================
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2 //
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3 // fgetc.cxx
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4 //
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5 // ISO C standard I/O get character functions
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6 //
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7 //===========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //===========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jlarmour
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43 // Contributors:
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44 // Date: 2000-04-20
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45 // Purpose: Provide the fgetc() function. Also provides the function
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46 // version of getc() and getchar()
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //===========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdio.h> // Configuration header
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57
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58 // INCLUDES
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59
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60 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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61 #include <cyg/infra/cyg_ass.h> // Standard eCos assertion support
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62 #include <cyg/infra/cyg_trac.h> // Standard eCos tracing support
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63 #include <stddef.h> // NULL and size_t from compiler
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64 #include <stdio.h> // header for this file
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65 #include <errno.h> // error codes
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66 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
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67
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68 // FUNCTIONS
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69
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70 externC int
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71 fgetc( FILE *stream ) __THROW
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72 {
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73 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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74 cyg_ucount32 bytes_read;
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75 Cyg_ErrNo err;
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76 cyg_uint8 c;
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77
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78 CYG_REPORT_FUNCNAMETYPE("fgetc", "returning char %d");
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79 CYG_REPORT_FUNCARG1XV( stream );
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80
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81 CYG_CHECK_DATA_PTR( stream, "stream is not a valid pointer" );
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82
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83 err = real_stream->read( &c, 1, &bytes_read );
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84
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85 // Why do we need this? Because the buffer might be empty.
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86 if (!err && !bytes_read) { // if no err, but nothing to read, try again
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87 err = real_stream->refill_read_buffer();
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88 if ( !err )
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89 err = real_stream->read( &c, 1, &bytes_read );
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90 } // if
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91
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92 CYG_ASSERT( (ENOERR != err) || (1 == bytes_read), "Didn't read 1 byte!" );
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93
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94 if (err)
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95 {
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96 if ( EAGAIN != err ) {
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97 real_stream->set_error( err );
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98 errno = err;
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99 }
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100 CYG_REPORT_RETVAL(EOF);
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101 return EOF;
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102 } // if
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103
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104 CYG_REPORT_RETVAL((int)c);
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105 return (int)c;
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106
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107 } // fgetc()
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108
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109
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110 // Also define getc() even though it can be a macro.
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111 // Undefine it first though
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112 #undef getchar
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113
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114 externC int
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115 getchar( void ) __THROW
115
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116 {
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117 return fgetc( stdin );
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118 } // getchar()
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119
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120
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121 // EXPORTED SYMBOLS
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122
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123 // Also define getc() even though it can be a macro.
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124 // Undefine it first though
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125 #undef getc
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126
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127 externC int
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128 getc( FILE * ) __THROW CYGBLD_ATTRIB_WEAK_ALIAS(fgetc);
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129
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130 // EOF fgetc.cxx