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1 //=========================================================================== |
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2 // |
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3 // gets.cxx |
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4 // |
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5 // ANSI Stdio gets() function |
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6 // |
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7 //=========================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //=========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998-02-13 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //=========================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Include the C library? And do we want the stdio stuff? |
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48 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions |
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53 #include <stddef.h> // NULL and size_t from compiler |
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54 #include <stdio.h> // header for this file |
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55 #include <errno.h> // error codes |
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56 #include <limits.h> // UINT_MAX |
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57 #include "clibincl/stdiosupp.hxx" // Support functions for stdio |
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58 #include "clibincl/stream.hxx" // Cyg_StdioStream |
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59 |
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60 // EXPORTED SYMBOLS |
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61 |
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62 externC char * |
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63 gets( char * ) CYGPRI_LIBC_WEAK_ALIAS("_gets"); |
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64 |
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65 // FUNCTIONS |
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66 |
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67 externC char * |
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68 _gets( char *s ) |
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69 { |
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70 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stdin; |
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71 cyg_ucount32 bytes_read; |
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72 Cyg_ErrNo err; |
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73 |
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74 |
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75 err = real_stream->read( (cyg_uint8 *)s, UINT_MAX, &bytes_read ); |
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76 |
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77 if (!err && !bytes_read) // if no err, but nothing to read, try again |
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78 { |
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79 real_stream->refill_read_buffer(); |
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80 err = real_stream->read( (cyg_uint8 *)s, UINT_MAX, &bytes_read ); |
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81 |
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82 } // if |
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83 |
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84 if (err) |
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85 { |
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86 real_stream->set_error( err ); |
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87 errno = err; |
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88 return NULL; |
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89 } // if |
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90 |
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91 if (bytes_read > 0) |
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92 { |
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93 // NULL terminate it |
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94 if (s[bytes_read-1] == '\n') |
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95 s[bytes_read-1] = '\0'; |
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96 else |
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97 s[bytes_read]='\0'; |
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98 } // if |
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99 |
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100 return s; |
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101 |
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102 } // _gets() |
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103 |
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104 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO) |
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105 |
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106 // EOF gets.cxx |
