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428
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1 /* Generic stream implementation -- header file.
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2 Copyright (C) 1995 Free Software Foundation, Inc.
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788
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3 Copyright (C) 1996, 2001, 2002 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* Written by Ben Wing. */
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25
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440
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26 #ifndef INCLUDED_lstream_h_
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27 #define INCLUDED_lstream_h_
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428
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28
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29 /************************************************************************/
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30 /* definition of Lstream object */
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31 /************************************************************************/
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32
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33 DECLARE_LRECORD (lstream, struct lstream);
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34 #define XLSTREAM(x) XRECORD (x, lstream, struct lstream)
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35 #define XSETLSTREAM(x, p) XSETRECORD (x, p, lstream)
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617
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36 #define wrap_lstream(p) wrap_record (p, lstream)
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428
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37 #define LSTREAMP(x) RECORDP (x, lstream)
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38 /* #define CHECK_LSTREAM(x) CHECK_RECORD (x, lstream)
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39 Lstream pointers should never escape to the Lisp level, so
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40 functions should not be doing this. */
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41
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42 #ifndef EOF
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43 #define EOF (-1)
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44 #endif
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45
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771
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46 /* There have been some arguments over the what the type should be that
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665
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47 specifies a count of bytes in a data block to be written out or read in,
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48 using Lstream_read(), Lstream_write(), and related functions.
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49 Originally it was long, which worked fine; Martin "corrected" these to
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50 size_t and ssize_t on the grounds that this is theoretically cleaner and
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51 is in keeping with the C standards. Unfortunately, this practice is
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52 horribly error-prone due to design flaws in the way that mixed
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53 signed/unsigned arithmetic happens. In fact, by doing this change,
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54 Martin introduced a subtle but fatal error that caused the operation of
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55 sending large mail messages to the SMTP server under Windows to fail.
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56 By putting all values back to be signed, avoiding any signed/unsigned
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57 mixing, the bug immediately went away. The type then in use was
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58 Lstream_Data_Count, so that it be reverted cleanly if a vote came to
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59 that. Now it is Bytecount.
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60
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61 Some earlier comments about why the type must be signed: This MUST BE
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62 SIGNED, since it also is used in functions that return the number of
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63 bytes actually read to or written from in an operation, and these
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64 functions can return -1 to signal error.
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462
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65
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66 Note that the standard Unix read() and write() functions define the
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67 count going in as a size_t, which is UNSIGNED, and the count going
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68 out as an ssize_t, which is SIGNED. This is a horrible design
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69 flaw. Not only is it highly likely to lead to logic errors when a
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70 -1 gets interpreted as a large positive number, but operations are
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71 bound to fail in all sorts of horrible ways when a number in the
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72 upper-half of the size_t range is passed in -- this number is
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73 unrepresentable as an ssize_t, so code that checks to see how many
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74 bytes are actually written (which is mandatory if you are dealing
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75 with certain types of devices) will get completely screwed up.
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771
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76
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665
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77 --ben
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462
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78 */
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428
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79 typedef enum lstream_buffering
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80 {
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81 /* No buffering. */
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82 LSTREAM_UNBUFFERED,
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83 /* Buffer until a '\n' character is reached. */
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84 LSTREAM_LINE_BUFFERED,
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85 /* Buffer in standard-size (i.e. 512-byte) blocks. */
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86 LSTREAM_BLOCK_BUFFERED,
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87 /* Buffer in blocks of a specified size. */
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88 LSTREAM_BLOCKN_BUFFERED,
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89 /* Buffer until the stream is closed (only applies to write-only
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90 streams). Only one call to the stream writer will be made,
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91 and that is when the stream is closed. */
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92 LSTREAM_UNLIMITED
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93 } Lstream_buffering;
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94
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771
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95 #if 0
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96
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97 /* #### not currently implemented; correct EOF handling is quite tricky
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98 in the presence of various levels of filtering streams, and simply
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99 interpreting 0 as EOF works fairly well as long as the amount of
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100 data you're attempting to read is large and you know whether the
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101 source stream at the end of the chain is a pipe (or other blocking
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102 source) or not. we really should fix this, though. */
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103
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104 /* Return values from Lstream_read(). We do NOT use the C lib trick
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105 of returning 0 to maybe indicate EOF because that is simply too
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106 random and error-prone. It is quite legitimate for there to be no
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107 data available but no EOF, even when not in the presence of
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108 non-blocking I/O. For example, decoding/encoding streams (and in
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109 general, any type of filtering stream) may only be able to return
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110 data after a certain amount of data on the other end is
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111 available. */
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112
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113 #define LSTREAM_EOF -2
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114
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115 #endif /* 0 */
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116
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117 #define LSTREAM_ERROR -1
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118
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428
|
119 /* Methods defining how this stream works. Some may be undefined. */
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120
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121 /* We do not implement the seek/tell paradigm. I tried to do that,
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122 but getting the semantics right in the presence of buffering is
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123 extremely tricky and very error-prone and basically not worth it.
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124 This is especially the case with complicated streams like
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125 decoding streams -- the seek pointer in this case can't be a single
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126 integer but has to be a whole complicated structure that records
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127 all of the stream's state at the time.
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128
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129 Rewind semantics are generally easy to implement, so we do provide
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130 a rewind method. Even rewind() may not be available on a stream,
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131 however -- e.g. on process output. */
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132
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133 typedef struct lstream_implementation
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134 {
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442
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135 const char *name;
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665
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136 Bytecount size; /* Number of additional bytes to be
|
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462
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137 allocated with this stream. Access this
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138 data using Lstream_data(). */
|
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428
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139 /* Read some data from the stream's end and store it into DATA, which
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140 can hold SIZE bytes. Return the number of bytes read. A return
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141 value of 0 means no bytes can be read at this time. This may
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142 be because of an EOF, or because there is a granularity greater
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143 than one byte that the stream imposes on the returned data, and
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144 SIZE is less than this granularity. (This will happen frequently
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145 for streams that need to return whole characters, because
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146 Lstream_read() calls the reader function repeatedly until it
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147 has the number of bytes it wants or until 0 is returned.)
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148 The lstream functions do not treat a 0 return as EOF or do
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149 anything special; however, the calling function will interpret
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150 any 0 it gets back as EOF. This will normally not happen unless
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151 the caller calls Lstream_read() with a very small size.
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152
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153 This function can be NULL if the stream is output-only. */
|
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442
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154 /* The omniscient mly, blinded by the irresistible thrall of Common
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428
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155 Lisp, thinks that it is bogus that the types and implementations
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156 of input and output streams are the same. */
|
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665
|
157 Bytecount (*reader) (Lstream *stream, unsigned char *data,
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158 Bytecount size);
|
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428
|
159 /* Send some data to the stream's end. Data to be sent is in DATA
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160 and is SIZE bytes. Return the number of bytes sent. This
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161 function can send and return fewer bytes than is passed in; in
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162 that case, the function will just be called again until there is
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163 no data left or 0 is returned. A return value of 0 means that no
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164 more data can be currently stored, but there is no error; the
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165 data will be squirrelled away until the writer can accept
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166 data. (This is useful, e.g., of you're dealing with a
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167 non-blocking file descriptor and are getting EWOULDBLOCK errors.)
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168 This function can be NULL if the stream is input-only. */
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665
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169 Bytecount (*writer) (Lstream *stream, const unsigned char *data,
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170 Bytecount size);
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428
|
171 /* Return non-zero if the last write operation on the stream resulted
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172 in an attempt to block (EWOULDBLOCK). If this method does not
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173 exists, the implementation returns 0 */
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174 int (*was_blocked_p) (Lstream *stream);
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175 /* Rewind the stream. If this is NULL, the stream is not seekable. */
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176 int (*rewinder) (Lstream *stream);
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177 /* Indicate whether this stream is seekable -- i.e. it can be rewound.
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178 This method is ignored if the stream does not have a rewind
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179 method. If this method is not present, the result is determined
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180 by whether a rewind method is present. */
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181 int (*seekable_p) (Lstream *stream);
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182 /* Perform any additional operations necessary to flush the
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183 data in this stream. */
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184 int (*flusher) (Lstream *stream);
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771
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185 /* Perform any additional operations necessary to close this stream down.
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186 May be NULL. This function is called when Lstream_close() is called
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187 (which will be called automatically on any open streams when they are
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188 garbage-collected or deleted with Lstream_delete()). When this
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189 function is called, all pending data in the stream will already have
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190 been written out; however, the closer write more data, e.g. an "end"
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191 section at the end of a file. */
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428
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192 int (*closer) (Lstream *stream);
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771
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193 /* Clean up any remaining data at the time that a stream is
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194 garbage-collected or deleted with Lstream_delete(). If the stream was
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195 open at this point, the finalizer is called after calling
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196 Lstream_close(). Called only once (NOT called at disksave time). */
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197 void (*finalizer) (Lstream *stream);
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428
|
198 /* Mark this object for garbage collection. Same semantics as
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199 a standard Lisp_Object marker. This function can be NULL. */
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200 Lisp_Object (*marker) (Lisp_Object lstream);
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|
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201 } Lstream_implementation;
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202
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771
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203 #define DEFINE_LSTREAM_IMPLEMENTATION(name, c_name) \
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204 Lstream_implementation lstream_##c_name[1] = \
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205 { { (name), sizeof (struct c_name##_stream) } }
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206
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207 #define DECLARE_LSTREAM(c_name) \
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208 extern Lstream_implementation lstream_##c_name[]
|
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428
|
209
|
|
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210 #define LSTREAM_FL_IS_OPEN 1
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211 #define LSTREAM_FL_READ 2
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212 #define LSTREAM_FL_WRITE 4
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213 #define LSTREAM_FL_NO_PARTIAL_CHARS 8
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214 #define LSTREAM_FL_CLOSE_AT_DISKSAVE 16
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215
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|
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216 struct lstream
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|
|
217 {
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|
|
218 struct lcrecord_header header;
|
|
442
|
219 const Lstream_implementation *imp; /* methods for this stream */
|
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428
|
220 Lstream_buffering buffering; /* type of buffering in use */
|
|
665
|
221 Bytecount buffering_size; /* number of bytes buffered */
|
|
428
|
222
|
|
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223 unsigned char *in_buffer; /* holds characters read from stream end */
|
|
665
|
224 Bytecount in_buffer_size; /* allocated size of buffer */
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225 Bytecount in_buffer_current; /* number of characters in buffer */
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|
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226 Bytecount in_buffer_ind; /* pointer to next character to
|
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462
|
227 take from buffer */
|
|
428
|
228
|
|
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229 unsigned char *out_buffer; /* holds characters to write to stream end */
|
|
665
|
230 Bytecount out_buffer_size; /* allocated size of buffer */
|
|
|
231 Bytecount out_buffer_ind; /* pointer to next buffer spot to
|
|
462
|
232 write a character */
|
|
428
|
233
|
|
|
234 /* The unget buffer is more or less a stack -- things get pushed
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|
|
235 onto the end and read back from the end. Lstream_read()
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236 basically reads backwards from the end to get stuff; Lstream_unread()
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|
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237 similarly has to push the data on backwards. */
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|
|
238 unsigned char *unget_buffer; /* holds characters pushed back onto input */
|
|
665
|
239 Bytecount unget_buffer_size; /* allocated size of buffer */
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|
|
240 Bytecount unget_buffer_ind; /* pointer to next buffer spot
|
|
462
|
241 to write a character */
|
|
428
|
242
|
|
665
|
243 Bytecount byte_count;
|
|
456
|
244 int flags;
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|
|
245 max_align_t data[1];
|
|
428
|
246 };
|
|
|
247
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|
|
248 #define LSTREAM_TYPE_P(lstr, type) \
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249 ((lstr)->imp == lstream_##type)
|
|
|
250
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|
|
251 #ifdef ERROR_CHECK_TYPECHECK
|
|
442
|
252 INLINE_HEADER struct lstream *
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428
|
253 error_check_lstream_type (struct lstream *stream,
|
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442
|
254 const Lstream_implementation *imp);
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|
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255 INLINE_HEADER struct lstream *
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428
|
256 error_check_lstream_type (struct lstream *stream,
|
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442
|
257 const Lstream_implementation *imp)
|
|
428
|
258 {
|
|
|
259 assert (stream->imp == imp);
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|
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260 return stream;
|
|
|
261 }
|
|
771
|
262 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
|
263 ((struct type##_stream *) \
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|
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264 Lstream_data (error_check_lstream_type (lstr, lstream_##type)))
|
|
428
|
265 #else
|
|
771
|
266 # define LSTREAM_TYPE_DATA(lstr, type) \
|
|
428
|
267 ((struct type##_stream *) Lstream_data (lstr))
|
|
|
268 #endif
|
|
|
269
|
|
771
|
270 /* Declare that lstream-type TYPE has method M; used in initialization
|
|
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271 routines */
|
|
428
|
272 #define LSTREAM_HAS_METHOD(type, m) \
|
|
|
273 (lstream_##type->m = type##_##m)
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|
|
274
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|
|
275
|
|
442
|
276 Lstream *Lstream_new (const Lstream_implementation *imp,
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277 const char *mode);
|
|
428
|
278 void Lstream_reopen (Lstream *lstr);
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|
|
279 void Lstream_set_buffering (Lstream *lstr, Lstream_buffering buffering,
|
|
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280 int buffering_size);
|
|
|
281 int Lstream_flush (Lstream *lstr);
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|
|
282 int Lstream_flush_out (Lstream *lstr);
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|
|
283 int Lstream_fputc (Lstream *lstr, int c);
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|
|
284 int Lstream_fgetc (Lstream *lstr);
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|
|
285 void Lstream_fungetc (Lstream *lstr, int c);
|
|
665
|
286 Bytecount Lstream_read (Lstream *lstr, void *data,
|
|
|
287 Bytecount size);
|
|
771
|
288 int Lstream_write (Lstream *lstr, const void *data,
|
|
|
289 Bytecount size);
|
|
428
|
290 int Lstream_was_blocked_p (Lstream *lstr);
|
|
665
|
291 void Lstream_unread (Lstream *lstr, const void *data, Bytecount size);
|
|
428
|
292 int Lstream_rewind (Lstream *lstr);
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|
|
293 int Lstream_seekable_p (Lstream *lstr);
|
|
|
294 int Lstream_close (Lstream *lstr);
|
|
771
|
295
|
|
428
|
296 void Lstream_delete (Lstream *lstr);
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|
|
297 void Lstream_set_character_mode (Lstream *str);
|
|
771
|
298 void Lstream_unset_character_mode (Lstream *lstr);
|
|
428
|
299
|
|
771
|
300 /* Lstream_putc: Write out one byte to the stream. This is a macro
|
|
|
301 and so it is very efficient. The C argument is only evaluated once
|
|
|
302 but the STREAM argument is evaluated more than once. Returns 0 on
|
|
|
303 success, -1 on error. */
|
|
428
|
304
|
|
771
|
305 #define Lstream_putc(stream, c) \
|
|
|
306 /* Call the function equivalent if the out buffer is full. Otherwise, \
|
|
|
307 add to the end of the out buffer and, if line buffering is called for \
|
|
|
308 and the character marks the end of a line, write out the buffer. */ \
|
|
|
309 ((stream)->out_buffer_ind >= (stream)->out_buffer_size ? \
|
|
|
310 Lstream_fputc (stream, c) : \
|
|
|
311 ((stream)->out_buffer[(stream)->out_buffer_ind++] = \
|
|
|
312 (unsigned char) (c), \
|
|
|
313 (stream)->byte_count++, \
|
|
|
314 (stream)->buffering == LSTREAM_LINE_BUFFERED && \
|
|
|
315 (stream)->out_buffer[(stream)->out_buffer_ind - 1] == '\n' ? \
|
|
428
|
316 Lstream_flush_out (stream) : 0))
|
|
|
317
|
|
771
|
318 /* Lstream_getc: Read one byte from the stream and returns it as an
|
|
|
319 unsigned char cast to an int, or EOF on end of file or error. This
|
|
|
320 is a macro and so it is very efficient. The STREAM argument is
|
|
|
321 evaluated more than once. */
|
|
|
322
|
|
|
323 #define Lstream_getc(stream) \
|
|
|
324 /* Retrieve from unget buffer if there are any characters there; \
|
|
|
325 else retrieve from in buffer if there's anything there; \
|
|
|
326 else call the function equivalent */ \
|
|
428
|
327 ((stream)->unget_buffer_ind > 0 ? \
|
|
|
328 ((stream)->byte_count++, \
|
|
|
329 (stream)->unget_buffer[--(stream)->unget_buffer_ind]) : \
|
|
|
330 (stream)->in_buffer_ind < (stream)->in_buffer_current ? \
|
|
|
331 ((stream)->byte_count++, \
|
|
|
332 (stream)->in_buffer[(stream)->in_buffer_ind++]) : \
|
|
|
333 Lstream_fgetc (stream))
|
|
|
334
|
|
771
|
335 /* Lstream_ungetc: Push one byte back onto the input queue, cast to
|
|
|
336 unsigned char. This will be the next byte read from the stream.
|
|
|
337 Any number of bytes can be pushed back and will be read in the
|
|
|
338 reverse order they were pushed back -- most recent first. (This is
|
|
|
339 necessary for consistency -- if there are a number of bytes that
|
|
|
340 have been unread and I read and unread a byte, it needs to be the
|
|
|
341 first to be read again.) This is a macro and so it is very
|
|
|
342 efficient. The C argument is only evaluated once but the STREAM
|
|
|
343 argument is evaluated more than once.
|
|
|
344 */
|
|
|
345
|
|
428
|
346 #define Lstream_ungetc(stream, c) \
|
|
771
|
347 /* Add to the end if it won't overflow buffer; otherwise call the \
|
|
|
348 function equivalent */ \
|
|
428
|
349 ((stream)->unget_buffer_ind >= (stream)->unget_buffer_size ? \
|
|
|
350 Lstream_fungetc (stream, c) : \
|
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351 (void) ((stream)->byte_count--, \
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352 ((stream)->unget_buffer[(stream)->unget_buffer_ind++] = \
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353 (unsigned char) (c))))
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354
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355 #define Lstream_data(stream) ((void *) ((stream)->data))
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356 #define Lstream_byte_count(stream) ((stream)->byte_count)
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357
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358
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359 /************************************************************************/
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360 /* working with an Lstream as a stream of Emchars */
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361 /************************************************************************/
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362
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363 #ifdef MULE
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364
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442
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365 INLINE_HEADER Emchar Lstream_get_emchar (Lstream *stream);
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366 INLINE_HEADER Emchar
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428
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367 Lstream_get_emchar (Lstream *stream)
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368 {
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369 int c = Lstream_getc (stream);
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444
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370 return (c < 0x80 /* c == EOF || BYTE_ASCII_P (c) */
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371 ? (Emchar) c
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372 : Lstream_get_emchar_1 (stream, c));
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428
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373 }
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374
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771
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375 /* Write an Emchar to a stream. Return value is 0 for success, -1 for
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376 failure. */
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377
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442
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378 INLINE_HEADER int Lstream_put_emchar (Lstream *stream, Emchar ch);
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379 INLINE_HEADER int
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428
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380 Lstream_put_emchar (Lstream *stream, Emchar ch)
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381 {
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382 return CHAR_ASCII_P (ch) ?
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383 Lstream_putc (stream, ch) :
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384 Lstream_fput_emchar (stream, ch);
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385 }
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386
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442
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387 INLINE_HEADER void Lstream_unget_emchar (Lstream *stream, Emchar ch);
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388 INLINE_HEADER void
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428
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389 Lstream_unget_emchar (Lstream *stream, Emchar ch)
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390 {
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391 if (CHAR_ASCII_P (ch))
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392 Lstream_ungetc (stream, ch);
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393 else
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394 Lstream_funget_emchar (stream, ch);
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395 }
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396 #else /* not MULE */
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397
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398 # define Lstream_get_emchar(stream) Lstream_getc (stream)
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399 # define Lstream_put_emchar(stream, ch) Lstream_putc (stream, ch)
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400 # define Lstream_unget_emchar(stream, ch) Lstream_ungetc (stream, ch)
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401
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402 #endif /* not MULE */
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403
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404
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405 /************************************************************************/
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406 /* Lstream implementations */
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407 /************************************************************************/
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408
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409 /* Flags we can pass to the filedesc and stdio streams. */
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410
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411 /* If set, close the descriptor or FILE * when the stream is closed. */
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412 #define LSTR_CLOSING 1
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413
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414 /* If set, allow quitting out of the actual I/O. */
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415 #define LSTR_ALLOW_QUIT 2
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416
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417 /* If set and filedesc_stream_set_pty_flushing() has been called
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418 on the stream, do not send more than pty_max_bytes on a single
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419 line without flushing the data out using the eof_char. */
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420 #define LSTR_PTY_FLUSHING 4
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421
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422 /* If set, an EWOULDBLOCK error is not treated as an error but
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423 simply causes the write function to return 0 as the number
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424 of bytes written out. */
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425 #define LSTR_BLOCKED_OK 8
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426
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427 Lisp_Object make_stdio_input_stream (FILE *stream, int flags);
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428 Lisp_Object make_stdio_output_stream (FILE *stream, int flags);
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429 Lisp_Object make_filedesc_input_stream (int filedesc, int offset, int count,
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430 int flags);
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|
431 Lisp_Object make_filedesc_output_stream (int filedesc, int offset, int count,
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|
|
432 int flags);
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|
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433 void filedesc_stream_set_pty_flushing (Lstream *stream,
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|
434 int pty_max_bytes,
|
|
665
|
435 Intbyte eof_char);
|
|
428
|
436 int filedesc_stream_fd (Lstream *stream);
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|
|
437 Lisp_Object make_lisp_string_input_stream (Lisp_Object string,
|
|
|
438 Bytecount offset,
|
|
|
439 Bytecount len);
|
|
462
|
440 Lisp_Object make_fixed_buffer_input_stream (const void *buf,
|
|
665
|
441 Bytecount size);
|
|
462
|
442 Lisp_Object make_fixed_buffer_output_stream (void *buf,
|
|
665
|
443 Bytecount size);
|
|
442
|
444 const unsigned char *fixed_buffer_input_stream_ptr (Lstream *stream);
|
|
428
|
445 unsigned char *fixed_buffer_output_stream_ptr (Lstream *stream);
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|
|
446 Lisp_Object make_resizing_buffer_output_stream (void);
|
|
|
447 unsigned char *resizing_buffer_stream_ptr (Lstream *stream);
|
|
788
|
448 Lisp_Object resizing_buffer_to_lisp_string (Lstream *stream);
|
|
428
|
449 Lisp_Object make_dynarr_output_stream (unsigned_char_dynarr *dyn);
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|
|
450 #define LSTR_SELECTIVE 1
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|
|
451 #define LSTR_IGNORE_ACCESSIBLE 2
|
|
665
|
452 Lisp_Object make_lisp_buffer_input_stream (struct buffer *buf, Charbpos start,
|
|
|
453 Charbpos end, int flags);
|
|
|
454 Lisp_Object make_lisp_buffer_output_stream (struct buffer *buf, Charbpos pos,
|
|
428
|
455 int flags);
|
|
665
|
456 Charbpos lisp_buffer_stream_startpos (Lstream *stream);
|
|
428
|
457
|
|
440
|
458 #endif /* INCLUDED_lstream_h_ */
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