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annotate packages/language/c/libc/stdio/current/src/input/fgets.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children b939e9cada46
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1 //========================================================================
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2 //
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3 // fgets.cxx
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4 //
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5 // ANSI Stdio fgets() 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 //
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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:
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36 // Date: 2000-04-20
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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_stdio.h> // Configuration header
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48
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49 // INCLUDES
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50
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51 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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52 #include <stddef.h> // NULL and size_t from compiler
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53 #include <stdio.h> // header for this file
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54 #include <errno.h> // error codes
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55 #include <cyg/libc/stdio/stream.hxx>// Cyg_StdioStream
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56
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57 // FUNCTIONS
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58
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59 externC char *
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60 fgets( char *s, int n, FILE *stream )
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61 {
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62 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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63 cyg_ucount32 bytes_read;
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64 Cyg_ErrNo err;
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65
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66
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67 err = real_stream->read( (cyg_uint8 *)s, n-1, &bytes_read );
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68
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69 if (!err && !bytes_read) { // if no err, but nothing to read, try again
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70 err = real_stream->refill_read_buffer();
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71 if ( !err )
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72 err = real_stream->read( (cyg_uint8 *)s, n-1, &bytes_read );
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73
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74 } // if
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75
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76 if (err) {
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77 real_stream->set_error( err );
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78 errno = err;
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79 return NULL;
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80 } // if
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81
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82 if (bytes_read > 0)
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83 s[bytes_read]='\0'; // NULL terminate it
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84
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85 return s;
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86
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87 } // fgets()
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88
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89 // EOF fgets.cxx