Rev 698 | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
698 | serge | 1 | /**************************************************************************** |
2 | * |
||
3 | * Open Watcom Project |
||
4 | * |
||
5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
||
6 | * |
||
7 | * ======================================================================== |
||
8 | * |
||
9 | * This file contains Original Code and/or Modifications of Original |
||
10 | * Code as defined in and that are subject to the Sybase Open Watcom |
||
11 | * Public License version 1.0 (the 'License'). You may not use this file |
||
12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
||
13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
||
14 | * provided with the Original Code and Modifications, and is also |
||
15 | * available at www.sybase.com/developer/opensource. |
||
16 | * |
||
17 | * The Original Code and all software distributed under the License are |
||
18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
||
19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
||
20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
||
21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
||
22 | * NON-INFRINGEMENT. Please see the License for the specific language |
||
23 | * governing rights and limitations under the License. |
||
24 | * |
||
25 | * ======================================================================== |
||
26 | * |
||
27 | * Description: C Runtime write() and _lwrite() implementation. |
||
28 | * |
||
29 | ****************************************************************************/ |
||
30 | |||
31 | |||
32 | #include "variety.h" |
||
33 | #include "int64.h" |
||
34 | #include |
||
35 | #include |
||
36 | #include |
||
37 | #include |
||
38 | #include |
||
39 | #include |
||
40 | #include |
||
41 | #include "iomode.h" |
||
42 | #include "fileacc.h" |
||
43 | #include "rtcheck.h" |
||
44 | #include "rtdata.h" |
||
45 | #include "seterrno.h" |
||
46 | #include "lseek.h" |
||
727 | serge | 47 | #include "kolibri.h" |
698 | serge | 48 | |
49 | /* |
||
50 | The _lwrite function writes data to the specified file. |
||
51 | |||
52 | Note: This function is provided only for compatibility with 16-bit |
||
53 | versions of Windows. Win32-based applications should use the WriteFile |
||
54 | function. |
||
55 | |||
56 | UINT _lwrite( |
||
57 | HFILE hFile, // handle to file |
||
58 | LPCSTR lpBuffer, // write data buffer |
||
59 | UINT uBytes // number of bytes to write |
||
60 | ); |
||
61 | */ |
||
62 | |||
63 | extern void __STKOVERFLOW(); |
||
64 | |||
65 | /* |
||
66 | Win32 Note: |
||
67 | Note that it is not an error to set the file pointer to a position |
||
68 | beyond the end of the file. The size of the file does not increase |
||
69 | until you call the SetEndOfFile, WriteFile, or WriteFileEx function. A |
||
70 | write operation increases the size of the file to the file pointer |
||
71 | position plus the size of the buffer written, leaving the intervening |
||
72 | bytes uninitialized. Hence, the reason for zero-padding the file |
||
73 | to achieve POSIX conformance. |
||
74 | */ |
||
75 | |||
76 | /* |
||
77 | POSIX Note: |
||
78 | When writing to a file that does not support seek operations (pipe, |
||
79 | device, etc.), the O_APPEND flag is effectively ignored. POSIX does |
||
80 | not explicitly state this, but it is implied. Also, ESPIPE (illegal |
||
81 | seek error) is not listed for write(), only pwrite(). Hence we must |
||
82 | either not attempt to seek on such devices, or ignore the failures. |
||
83 | */ |
||
84 | |||
85 | #define PAD_SIZE 512 |
||
86 | |||
87 | typedef union { |
||
88 | unsigned __int64 _64; |
||
89 | long _32[2]; |
||
90 | } __i64; |
||
91 | |||
92 | static int zero_pad( int handle ) /* 09-jan-95 */ |
||
93 | /*******************************/ |
||
94 | { |
||
95 | int rc; |
||
96 | long curPos, eodPos; |
||
97 | long bytesToWrite; |
||
98 | unsigned writeAmt; |
||
99 | char zeroBuf[PAD_SIZE]; |
||
100 | |||
101 | // Pad with zeros due to lseek() past EOF (POSIX) |
||
102 | curPos = __lseek( handle, 0L, SEEK_CUR ); /* current offset */ |
||
103 | if( curPos == -1 ) |
||
104 | return( -1 ); |
||
105 | eodPos = __lseek( handle, 0L, SEEK_END ); /* end of data offset */ |
||
106 | if( eodPos == -1 ) |
||
107 | return( -1 ); |
||
108 | |||
109 | if( curPos > eodPos ) { |
||
110 | bytesToWrite = curPos - eodPos; /* amount to pad by */ |
||
111 | |||
112 | if( bytesToWrite > 0 ) { /* only write if needed */ |
||
113 | memset( zeroBuf, 0x00, PAD_SIZE ); /* zero out a buffer */ |
||
114 | do { /* loop until done */ |
||
115 | if( bytesToWrite > PAD_SIZE ) |
||
116 | writeAmt = 512; |
||
117 | else |
||
118 | writeAmt = (unsigned)bytesToWrite; |
||
119 | rc = write( handle, zeroBuf, writeAmt ); |
||
120 | if( rc < 0 ) |
||
121 | return( rc ); |
||
122 | bytesToWrite -= writeAmt; /* more bytes written */ |
||
123 | } while( bytesToWrite != 0 ); |
||
124 | } |
||
125 | } else { |
||
126 | curPos = __lseek( handle, curPos, SEEK_SET ); |
||
127 | if( curPos == -1 ) { |
||
128 | return( -1 ); |
||
129 | } |
||
130 | } |
||
131 | |||
132 | return( 0 ); /* return success code */ |
||
133 | } |
||
134 | |||
135 | /* |
||
136 | The os_write function returns 0 meaning no error, -1 meaning error, or |
||
137 | ENOSPC meaning no space left on device. |
||
138 | */ |
||
139 | |||
140 | typedef struct |
||
141 | { |
||
142 | char *name; |
||
143 | unsigned int offset; |
||
144 | }__file_handle; |
||
145 | |||
146 | static int os_write( int handle, const void *buffer, unsigned len, unsigned *amt ) |
||
147 | /********************************************************************************/ |
||
148 | { |
||
149 | __file_handle *fh; |
||
150 | int rc; |
||
151 | |||
152 | rc = 0; |
||
153 | |||
154 | fh = (__file_handle*) __getOSHandle( handle ); |
||
155 | |||
727 | serge | 156 | rc = write_file(fh->name,buffer,fh->offset,len,amt); |
157 | fh->offset+= *amt; |
||
698 | serge | 158 | |
159 | if( *amt != len ) |
||
160 | { |
||
161 | rc = ENOSPC; |
||
162 | __set_errno( rc ); |
||
163 | } |
||
164 | return( rc ); |
||
165 | } |
||
166 | |||
167 | _WCRTLINK int write( int handle, const void *buffer, unsigned len ) |
||
168 | /**********************************************************************/ |
||
169 | { |
||
170 | unsigned iomode_flags; |
||
171 | char *buf; |
||
172 | unsigned buf_size; |
||
173 | unsigned len_written, i, j; |
||
174 | int rc2; |
||
175 | |||
176 | __file_handle *fh; |
||
177 | |||
178 | __handle_check( handle, -1 ); |
||
179 | iomode_flags = __GetIOMode( handle ); |
||
180 | if( iomode_flags == 0 ) |
||
181 | { |
||
182 | __set_errno( EBADF ); |
||
183 | return( -1 ); |
||
184 | } |
||
185 | |||
186 | if( !(iomode_flags & _WRITE) ) { |
||
187 | __set_errno( EACCES ); /* changed from EBADF to EACCES 23-feb-89 */ |
||
188 | return( -1 ); |
||
189 | } |
||
190 | |||
191 | fh = (__file_handle*) __getOSHandle( handle ); |
||
192 | |||
193 | // put a semaphore around our writes |
||
194 | |||
195 | _AccessFileH( handle ); |
||
196 | if( (iomode_flags & _APPEND) && !(iomode_flags & _ISTTY) ) |
||
197 | { |
||
198 | fh->offset = __lseek( handle, 0L, SEEK_END ); /* end of data offset */ |
||
199 | } |
||
200 | |||
201 | len_written = 0; |
||
202 | rc2 = 0; |
||
203 | |||
204 | // Pad the file with zeros if necessary |
||
205 | if( iomode_flags & _FILEEXT ) { |
||
206 | // turn off file extended flag |
||
207 | __SetIOMode_nogrow( handle, iomode_flags&(~_FILEEXT) ); |
||
208 | |||
209 | // It is not required to pad a file with zeroes on an NTFS file system; |
||
210 | // unfortunately it is required on FAT (and probably FAT32). (JBS) |
||
211 | rc2 = zero_pad( handle ); |
||
212 | } |
||
213 | |||
214 | if( rc2 == 0 ) { |
||
215 | if( iomode_flags & _BINARY ) { /* if binary mode */ |
||
216 | rc2 = os_write( handle, buffer, len, &len_written ); |
||
217 | /* end of binary mode part */ |
||
218 | } else { /* text mode */ |
||
219 | i = stackavail(); |
||
220 | if( i < 0x00b0 ) { |
||
221 | __STKOVERFLOW(); /* not enough stack space */ |
||
222 | } |
||
223 | buf_size = 512; |
||
224 | if( i < (512 + 48) ) { |
||
225 | buf_size = 128; |
||
226 | } |
||
227 | |||
228 | buf = __alloca( buf_size ); |
||
229 | |||
230 | j = 0; |
||
231 | for( i = 0; i < len; ) |
||
232 | { |
||
233 | if( ((const char*)buffer)[i] == '\n' ) |
||
234 | { |
||
235 | buf[j] = '\r'; |
||
236 | ++j; |
||
237 | if( j == buf_size ) |
||
238 | { |
||
239 | rc2 = os_write( handle, buf, buf_size, &j ); |
||
240 | if( rc2 == -1 ) |
||
241 | break; |
||
242 | len_written += j; |
||
243 | if( rc2 == ENOSPC ) |
||
244 | break; |
||
245 | len_written = i; |
||
246 | j = 0; |
||
247 | } |
||
248 | } |
||
249 | buf[j] = ((const char*)buffer)[i]; |
||
250 | ++i; |
||
251 | ++j; |
||
252 | if( j == buf_size ) { |
||
253 | rc2 = os_write( handle, buf, buf_size, &j ); |
||
254 | if( rc2 == -1 ) |
||
255 | break; |
||
256 | len_written += j; |
||
257 | if( rc2 == ENOSPC ) |
||
258 | break; |
||
259 | len_written = i; |
||
260 | j = 0; |
||
261 | } |
||
262 | } |
||
263 | if( j ) { |
||
264 | rc2 = os_write( handle, buf, j, &i ); |
||
265 | if( rc2 == ENOSPC ) { |
||
266 | len_written += i; |
||
267 | } else { |
||
268 | len_written = len; |
||
269 | } |
||
270 | } |
||
271 | /* end of text mode part */ |
||
272 | } |
||
273 | } |
||
274 | _ReleaseFileH( handle ); |
||
275 | if( rc2 == -1 ) { |
||
276 | return( rc2 ); |
||
277 | } else { |
||
278 | return( len_written ); |
||
279 | } |
||
280 | }>>>> |
||
281 |