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annotate packages/language/c/libc/current/src/stdio/input/gets.cxx @ 92:08ffab08d2ee ecos-sw-2000-05-26

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Merge from eCos master repository on 2000-05-26-07:47:03-BST
author jlarmour
date Fri, 26 May 2000 13:46:34 +0000
parents bf00f99aec69
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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 Red Hat eCos Public License
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12 // Version 1.1 (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://www.redhat.com/
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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 Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
0
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors: jlarmour
0
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36 // Date: 1998-02-13
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc.h> // Configuration header
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48
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49 // Include the C library? And do we want the stdio stuff?
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50 #if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO)
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51
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52 // INCLUDES
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53
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54 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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55 #include <stddef.h> // NULL and size_t from compiler
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56 #include <stdio.h> // header for this file
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57 #include <errno.h> // error codes
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58 #include <limits.h> // UINT_MAX
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59 #include "clibincl/stdiosupp.hxx" // Support functions for stdio
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60 #include "clibincl/stream.hxx" // Cyg_StdioStream
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61
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62 // EXPORTED SYMBOLS
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63
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64 externC char *
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65 gets( char * ) CYGPRI_LIBC_WEAK_ALIAS("_gets");
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66
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67 // FUNCTIONS
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68
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69 externC char *
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70 _gets( char *s )
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71 {
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72 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stdin;
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73 cyg_ucount32 bytes_read;
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74 Cyg_ErrNo err;
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75
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76
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77 err = real_stream->read( (cyg_uint8 *)s, UINT_MAX, &bytes_read );
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78
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79 if (!err && !bytes_read) // if no err, but nothing to read, try again
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80 {
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81 real_stream->refill_read_buffer();
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82 err = real_stream->read( (cyg_uint8 *)s, UINT_MAX, &bytes_read );
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83
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84 } // if
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85
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86 if (err)
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87 {
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88 real_stream->set_error( err );
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89 errno = err;
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90 return NULL;
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91 } // if
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92
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93 if (bytes_read > 0)
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94 {
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95 // NULL terminate it
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96 if (s[bytes_read-1] == '\n')
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97 s[bytes_read-1] = '\0';
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98 else
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99 s[bytes_read]='\0';
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100 } // if
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101
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102 return s;
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103
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104 } // _gets()
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105
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106 #endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO)
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107
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108 // EOF gets.cxx