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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* Reentrant versions of write system call. */ |
| 2 | |||
| 3 | #include |
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| 4 | #include |
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| 5 | #include <_syslist.h> |
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| 6 | #include |
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| 7 | #include |
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| 8 | #include |
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| 9 | |||
| 10 | |||
| 11 | /* Some targets provides their own versions of this functions. Those |
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| 12 | targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS. */ |
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| 13 | |||
| 14 | #ifdef _REENT_ONLY |
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| 15 | #ifndef REENTRANT_SYSCALLS_PROVIDED |
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| 16 | #define REENTRANT_SYSCALLS_PROVIDED |
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| 17 | #endif |
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| 18 | #endif |
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| 19 | |||
| 20 | #ifndef REENTRANT_SYSCALLS_PROVIDED |
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| 21 | |||
| 22 | /* We use the errno variable used by the system dependent layer. */ |
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| 23 | |||
| 24 | /* |
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| 25 | FUNCTION |
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| 26 | <<_write_r>>---Reentrant version of write |
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| 27 | |||
| 28 | INDEX |
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| 29 | _write_r |
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| 30 | |||
| 31 | ANSI_SYNOPSIS |
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| 32 | #include |
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| 33 | _ssize_t _write_r(struct _reent *<[ptr]>, |
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| 34 | int <[fd]>, const void *<[buf]>, size_t <[cnt]>); |
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| 35 | |||
| 36 | TRAD_SYNOPSIS |
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| 37 | #include |
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| 38 | _ssize_t _write_r(<[ptr]>, <[fd]>, <[buf]>, <[cnt]>) |
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| 39 | struct _reent *<[ptr]>; |
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| 40 | int <[fd]>; |
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| 41 | char *<[buf]>; |
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| 42 | size_t <[cnt]>; |
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| 43 | |||
| 44 | DESCRIPTION |
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| 45 | This is a reentrant version of < |
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| 46 | takes a pointer to the global data block, which holds |
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| 47 | < |
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| 48 | */ |
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| 49 | |||
| 50 | |||
| 51 | #define _WRITE 0x0002 /* file opened for writing */ |
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| 52 | #define _APPEND 0x0080 /* file opened for append */ |
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| 53 | #define _BINARY 0x0040 /* file is binary, skip CRLF processing */ |
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| 54 | #define _ISTTY 0x2000 /* is console device */ |
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| 55 | #define _FILEEXT 0x8000 /* lseek with positive offset has been done */ |
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| 56 | |||
| 57 | #define __handle_check( __h, __r ) \ |
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| 58 | if( (__h) < 0 || (__h) > __NFiles ) { \ |
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| 59 | ptr->_errno = EBADF; \ |
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| 60 | return( __r ); \ |
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| 61 | } |
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| 62 | |||
| 63 | extern unsigned __NFiles; |
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| 64 | |||
| 65 | #define PAD_SIZE 512 |
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| 66 | |||
| 67 | static int zero_pad(struct _reent *ptr, int handle ) /* 09-jan-95 */ |
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| 68 | /*******************************/ |
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| 69 | { |
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| 70 | int rc; |
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| 71 | long curPos, eodPos; |
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| 72 | long bytesToWrite; |
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| 73 | unsigned writeAmt; |
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| 74 | char zeroBuf[PAD_SIZE]; |
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| 75 | |||
| 76 | // Pad with zeros due to lseek() past EOF (POSIX) |
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| 77 | curPos = _lseek_r( ptr, handle, 0L, SEEK_CUR ); /* current offset */ |
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| 78 | if( curPos == -1 ) |
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| 79 | return( -1 ); |
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| 80 | eodPos = _lseek_r( ptr, handle, 0L, SEEK_END ); /* end of data offset */ |
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| 81 | if( eodPos == -1 ) |
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| 82 | return( -1 ); |
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| 83 | |||
| 84 | if( curPos > eodPos ) { |
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| 85 | bytesToWrite = curPos - eodPos; /* amount to pad by */ |
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| 86 | |||
| 87 | if( bytesToWrite > 0 ) { /* only write if needed */ |
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| 88 | memset( zeroBuf, 0x00, PAD_SIZE ); /* zero out a buffer */ |
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| 89 | do { /* loop until done */ |
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| 90 | if( bytesToWrite > PAD_SIZE ) |
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| 91 | writeAmt = 512; |
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| 92 | else |
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| 93 | writeAmt = (unsigned)bytesToWrite; |
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| 94 | rc = _write_r(ptr, handle, zeroBuf, writeAmt ); |
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| 95 | if( rc < 0 ) |
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| 96 | return( rc ); |
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| 97 | bytesToWrite -= writeAmt; /* more bytes written */ |
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| 98 | } while( bytesToWrite != 0 ); |
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| 99 | } |
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| 100 | } else { |
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| 101 | curPos = _lseek_r( ptr, handle, curPos, SEEK_SET ); |
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| 102 | if( curPos == -1 ) { |
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| 103 | return( -1 ); |
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| 104 | } |
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| 105 | } |
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| 106 | |||
| 107 | return( 0 ); /* return success code */ |
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| 108 | } |
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| 109 | |||
| 110 | |||
| 111 | static int os_write(struct _reent *ptr, int handle, |
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| 112 | const void *buffer, unsigned len, unsigned *amt ) |
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| 113 | /********************************************************************************/ |
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| 114 | { |
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| 115 | __file_handle *fh; |
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| 116 | int rc; |
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| 117 | |||
| 118 | rc = 0; |
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| 119 | *amt = 0; |
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| 120 | |||
| 121 | fh = (__file_handle*) __getOSHandle( handle ); |
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| 122 | |||
| 123 | rc = fh->write(fh->name,buffer,fh->offset,len,amt); |
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| 124 | |||
| 125 | fh->offset+= *amt; |
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| 126 | |||
| 127 | if( *amt != len ) |
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| 128 | { |
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| 129 | rc = ENOSPC; |
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| 130 | ptr->_errno = ENOSPC; |
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| 131 | } |
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| 132 | return( rc ); |
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| 133 | } |
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| 134 | _ssize_t |
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| 135 | _DEFUN (_write_r, (ptr, fd, buffer, cnt), |
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| 136 | struct _reent *ptr _AND |
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| 137 | int fd _AND |
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| 138 | _CONST _PTR buffer _AND |
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| 139 | size_t cnt) |
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| 140 | { |
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| 141 | _ssize_t ret; |
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| 142 | unsigned int iomode_flags; |
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| 143 | unsigned len_written, i, j; |
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| 144 | int rc2; |
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| 145 | char *buf; |
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| 146 | |||
| 147 | __file_handle *fh; |
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| 148 | |||
| 149 | __handle_check( fd, -1 ); |
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| 150 | |||
| 151 | iomode_flags = __GetIOMode( fd ); |
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| 152 | if( iomode_flags == 0 ) |
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| 153 | { |
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| 154 | ptr->_errno = EBADF; |
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| 155 | return( -1 ); |
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| 156 | } |
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| 157 | |||
| 158 | if( !(iomode_flags & _WRITE) ) { |
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| 159 | ptr->_errno = EACCES ; /* changed from EBADF to EACCES 23-feb-89 */ |
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| 160 | return( -1 ); |
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| 161 | } |
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| 162 | |||
| 163 | if( (iomode_flags & _APPEND) && !(iomode_flags & _ISTTY) ) |
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| 164 | { |
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| 165 | fh->offset = _lseek_r(ptr, fd, 0L, SEEK_END ); /* end of data offset */ |
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| 166 | } |
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| 167 | |||
| 168 | len_written = 0; |
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| 169 | rc2 = 0; |
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| 170 | |||
| 171 | // Pad the file with zeros if necessary |
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| 172 | if( iomode_flags & _FILEEXT ) |
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| 173 | { |
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| 174 | // turn off file extended flag |
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| 175 | __SetIOMode_nogrow( fd, iomode_flags&(~_FILEEXT) ); |
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| 176 | |||
| 177 | // It is not required to pad a file with zeroes on an NTFS file system; |
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| 178 | // unfortunately it is required on FAT (and probably FAT32). (JBS) |
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| 179 | rc2 = zero_pad( ptr, fd ); |
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| 180 | } |
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| 181 | |||
| 182 | if( rc2 == 0 ) |
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| 183 | { |
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| 184 | if( iomode_flags & _BINARY ) { /* if binary mode */ |
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| 185 | rc2 = os_write(ptr, fd, buffer, cnt, &len_written ); |
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| 186 | /* end of binary mode part */ |
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| 187 | } else { /* text mode */ |
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| 188 | |||
| 189 | int buf_size = 512; |
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| 190 | |||
| 191 | buf = (char*)alloca( buf_size ); |
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| 192 | |||
| 193 | j = 0; |
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| 194 | for( i = 0; i < cnt; ) |
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| 195 | { |
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| 196 | if( ((const char*)buffer)[i] == '\n' ) |
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| 197 | { |
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| 198 | buf[j] = '\r'; |
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| 199 | ++j; |
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| 200 | if( j == buf_size ) |
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| 201 | { |
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| 202 | rc2 = os_write(ptr, fd, buf, buf_size, &j ); |
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| 203 | if( rc2 == -1 ) |
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| 204 | break; |
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| 205 | len_written += j; |
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| 206 | if( rc2 == ENOSPC ) |
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| 207 | break; |
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| 208 | len_written = i; |
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| 209 | j = 0; |
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| 210 | } |
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| 211 | } |
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| 212 | buf[j] = ((const char*)buffer)[i]; |
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| 213 | ++i; |
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| 214 | ++j; |
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| 215 | if( j == buf_size ) { |
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| 216 | rc2 = os_write(ptr, fd, buf, buf_size, &j ); |
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| 217 | if( rc2 == -1 ) |
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| 218 | break; |
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| 219 | len_written += j; |
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| 220 | if( rc2 == ENOSPC ) |
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| 221 | break; |
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| 222 | len_written = i; |
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| 223 | j = 0; |
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| 224 | } |
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| 225 | } |
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| 226 | if( j ) { |
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| 227 | rc2 = os_write(ptr, fd, buf, j, &i ); |
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| 228 | if( rc2 == ENOSPC ) { |
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| 229 | len_written += i; |
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| 230 | } else { |
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| 231 | len_written = cnt; |
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| 232 | } |
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| 233 | } |
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| 234 | /* end of text mode part */ |
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| 235 | } |
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| 236 | } |
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| 237 | |||
| 238 | if( rc2 == -1 ) { |
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| 239 | return( rc2 ); |
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| 240 | } else { |
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| 241 | return( len_written ); |
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| 242 | } |
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| 243 | } |
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| 244 | |||
| 245 | _ssize_t |
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| 246 | _DEFUN (write, ( fd, buffer, cnt), |
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| 247 | int fd _AND |
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| 248 | _CONST _PTR buffer _AND |
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| 249 | size_t cnt) |
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| 250 | |||
| 251 | { |
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| 252 | |||
| 253 | return _write_r(_REENT, fd, buffer, cnt); |
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| 254 | |||
| 255 | } |
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| 256 | |||
| 257 | #endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */ |