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Rev | Author | Line No. | Line |
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4921 | Serge | 1 | /* read.c -- read bytes from a input device. |
2 | * |
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3 | * Copyright (c) 1995 Cygnus Support |
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4 | * |
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5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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6 | * and license this software and its documentation for any purpose, provided |
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7 | * that existing copyright notices are retained in all copies and that this |
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8 | * notice is included verbatim in any distributions. No written agreement, |
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9 | * license, or royalty fee is required for any of the authorized uses. |
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10 | * Modifications to this software may be copyrighted by their authors |
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11 | * and need not follow the licensing terms described here, provided that |
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12 | * the new terms are clearly indicated on the first page of each file where |
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13 | * they apply. |
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14 | */ |
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15 | #include |
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16 | #include |
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17 | #include |
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18 | #include |
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19 | #include |
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20 | #include |
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21 | #include "glue.h" |
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22 | #include "io.h" |
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23 | |||
24 | #undef erro |
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25 | extern int errno; |
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26 | |||
27 | ssize_t read(int fd, void *buf, size_t cnt) |
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28 | { |
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29 | _ssize_t ret; |
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30 | |||
31 | _ssize_t read_len, total_len; |
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32 | unsigned reduce_idx, finish_idx; |
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33 | unsigned iomode_flags; |
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34 | char *buffer = buf; |
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35 | int rc; |
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36 | int h; |
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37 | unsigned amount_read; |
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38 | int err; |
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39 | |||
40 | __io_handle *ioh; |
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41 | |||
42 | if( (fd < 0) || (fd >=64) ) |
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43 | { |
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44 | errno = EBADF; |
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45 | return -1; |
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46 | }; |
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47 | |||
48 | ioh = &__io_tab[fd]; |
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49 | |||
50 | iomode_flags = ioh->mode; |
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51 | |||
52 | if( iomode_flags == 0 ) |
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53 | { |
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54 | errno = EBADF; |
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55 | return( -1 ); |
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56 | } |
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57 | |||
58 | if( !(iomode_flags & _READ) ) |
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59 | { |
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60 | errno = EACCES; |
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61 | return( -1 ); |
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62 | } |
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63 | |||
64 | if( iomode_flags & _BINARY ) /* if binary mode */ |
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65 | { |
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66 | err = read_file(ioh->name, buffer, ioh->offset, cnt, &amount_read); |
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67 | ioh->offset+= amount_read; |
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68 | total_len = amount_read; |
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69 | |||
70 | if(err) |
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71 | if ( amount_read == 0) |
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72 | return (-1); |
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73 | } |
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74 | else |
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75 | { |
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76 | total_len = 0; |
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77 | read_len = cnt; |
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78 | do |
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79 | { |
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80 | err=read_file(ioh->name,buffer, ioh->offset, cnt, &amount_read); |
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81 | ioh->offset+=amount_read; |
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82 | |||
83 | if( amount_read == 0 ) |
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84 | break; /* EOF */ |
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85 | |||
86 | reduce_idx = 0; |
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87 | finish_idx = reduce_idx; |
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88 | for( ; reduce_idx < amount_read; ++reduce_idx ) |
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89 | { |
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90 | if( buffer[ reduce_idx ] == 0x1a ) /* EOF */ |
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91 | { |
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92 | lseek(fd, ((long)reduce_idx - (long)amount_read)+1L, SEEK_CUR ); |
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93 | total_len += finish_idx; |
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94 | return( total_len ); |
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95 | } |
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96 | if( buffer[ reduce_idx ] != '\r' ) |
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97 | { |
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98 | buffer[ finish_idx++ ] = buffer[ reduce_idx ]; |
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99 | }; |
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100 | } |
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101 | |||
102 | total_len += finish_idx; |
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103 | buffer += finish_idx; |
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104 | read_len -= finish_idx; |
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105 | if( iomode_flags & _ISTTY ) |
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106 | { |
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107 | break; |
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108 | } |
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109 | } while( read_len != 0 ); |
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110 | } |
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111 | return( total_len ); |
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112 | }>> |