/*** *write.c - write to a file handle * * Copyright (c) 1989-1992, Microsoft Corporation. All rights reserved. * *Purpose: * defines _write() - write to a file handle * *Revision History: * 06-14-89 PHG Module created, based on asm version * 03-13-90 GJF Made calling type _CALLTYPE2 (for now), added #include * , fixed compiler warnings and fixed the * copyright. Also, cleaned up the formatting a bit. * 04-03-90 GJF Now _CALLTYPE1. * 07-24-90 SBM Removed '32' from API names * 08-14-90 SBM Compiles cleanly with -W3 * 10-01-90 GJF New-style function declarators. * 12-04-90 GJF Appended Win32 version onto source with #ifdef-s. * Should come back latter and do a better merge. * 12-04-90 SRW Changed to include instead of * 12-06-90 SRW Changed to use _osfile and _osfhnd instead of _osfinfo * 12-28-90 SRW Added _CRUISER_ conditional around check_stack pragma * 12-28-90 SRW Added cast of void * to char * for Mips C Compiler * 01-17-91 GJF ANSI naming. * 02-25-91 MHL Adapt to ReadFile/WriteFile changes (_WIN32_) * 04-09-91 PNT Added _MAC_ conditional * 07-18-91 GJF Removed unreferenced local variable from _write_lk * routine [_WIN32_]. * 10-24-91 GJF Added LPDWORD casts to make MIPS compiler happy. * ASSUMES THAT sizeof(int) == sizeof(DWORD). * 02-13-92 GJF Replaced _nfile by _nhandle for Win32. * 02-15-92 GJF Increased BUF_SIZE and simplified LF translation code * for Win32. * *******************************************************************************/ #include #include #include #include #include #include #include #include #include #ifdef _WIN32_ #define BUF_SIZE 1025 /* size of LF translation buffer */ #else /* ndef _WIN32_ */ #define BUF_SIZE 513 /* size of LF translation buffer, sector size+1 is ok */ #endif /* _WIN32_ */ #define LF '\n' /* line feed */ #define CR '\r' /* carriage return */ #define CTRLZ 26 /* ctrl-z */ #ifdef _CRUISER_ #pragma check_stack(on) #endif /* ndef _CRUISER_ */ /*** *int _write(fh, buf, cnt) - write bytes to a file handle * *Purpose: * Writes count bytes from the buffer to the handle specified. * If the file was opened in text mode, each LF is translated to * CR-LF. This does not affect the return value. In text * mode ^Z indicates end of file. * * Multi-thread notes: * (1) _write() - Locks/unlocks file handle * _write_lk() - Does NOT lock/unlock file handle * *Entry: * int fh - file handle to write to * char *buf - buffer to write from * unsigned int cnt - number of bytes to write * *Exit: * returns number of bytes actually written. * This may be less than cnt, for example, if out of disk space. * returns -1 (and set errno) if fails. * *Exceptions: * *******************************************************************************/ #ifdef MTHREAD /* define normal version that locks/unlocks, validates fh */ int _CALLTYPE1 _write ( int fh, const void *buf, unsigned cnt ) { int r; /* return value */ /* validate handle */ #ifdef _WIN32_ if ( (unsigned)fh >= (unsigned)_nhandle ) { #else if ((unsigned)fh >= (unsigned)_nfile) { #endif /* out of range -- return error */ errno = EBADF; _doserrno = 0; /* not OS/2 error */ return -1; } _lock_fh(fh); /* lock file */ r = _write_lk(fh, buf, cnt); /* write bytes */ _unlock_fh(fh); /* unlock file */ return r; } /* now define version that doesn't lock/unlock, validate fh */ int _CALLTYPE1 _write_lk ( int fh, const void *buf, unsigned cnt ) { int lfcount; /* count of line feeds */ int charcount; /* count of chars written so far */ int written; /* count of chars written on this write */ #ifdef _CRUISER_ int error; /* error occured */ #endif ULONG dosretval; /* OS/2 return value */ char ch; /* current character */ char *p, *q; /* pointers into buf and lfbuf resp. */ char lfbuf[BUF_SIZE]; /* lf translation buffer */ #else /* now define normal version */ int _CALLTYPE1 _write ( int fh, const void *buf, unsigned cnt ) { int lfcount; /* count of line feeds */ int charcount; /* count of chars written so far */ int written; /* count of chars written on this write */ #ifdef _CRUISER_ int error; /* error occured */ #endif ULONG dosretval; /* OS/2 return value */ char ch; /* current character */ char *p, *q; /* pointers into buf and lfbuf resp. */ char lfbuf[BUF_SIZE]; /* lf translation buffer */ /* validate handle */ #ifdef _WIN32_ if ( (unsigned)fh >= (unsigned)_nhandle ) { #else if ((unsigned)fh >= (unsigned)_nfile) { #endif /* out of range -- return error */ errno = EBADF; _doserrno = 0; /* not OS/2 error */ return -1; } #endif lfcount = charcount = 0; /* nothing written yet */ if (cnt == 0) return 0; /* nothing to do */ if (_osfile[fh] & FAPPEND) { /* appending - seek to end of file; ignore error, because maybe file doesn't allow seeking */ (void)_lseek_lk(fh, 0, FILE_END); } /* check for text mode with LF's in the buffer */ #ifdef _CRUISER_ if ((_osfile[fh] & FTEXT) && memchr(buf, LF, cnt)) { /* text mode, translate LF's to CR/LF's on output */ p = (char *)buf; /* start at beginning of buffer */ error = 0; /* no error yet */ while ((unsigned)(p - (char *)buf) < cnt && !error) { q = lfbuf; /* start at beginning of lfbuf */ /* fill the lf buf, except maybe last char */ while (q - lfbuf < BUF_SIZE - 1 && (unsigned)(p - (char *)buf) < cnt) { ch = *p++; if (ch == LF) { ++lfcount; *q++ = CR; *q++ = LF; /* store CR-LF */ } else *q++ = ch; } /* write the lf buf and update total */ if (dosretval = DOSWRITE(fh, lfbuf, q - lfbuf, &written)) error = 1; else { charcount += written; if (written < q - lfbuf) error = 1; } } } else { /* binary mode, no translation */ if (!(dosretval = DOSWRITE(fh, (char *)buf, cnt, &written))) charcount = written; } #else /* _CRUISER_ */ #ifdef _WIN32_ if ( _osfile[fh] & FTEXT ) { /* text mode, translate LF's to CR/LF's on output */ p = (char *)buf; /* start at beginning of buffer */ dosretval = 0; /* no OS error yet */ while ( (unsigned)(p - (char *)buf) < cnt ) { q = lfbuf; /* start at beginning of lfbuf */ /* fill the lf buf, except maybe last char */ while ( q - lfbuf < BUF_SIZE - 1 && (unsigned)(p - (char *)buf) < cnt ) { ch = *p++; if ( ch == LF ) { ++lfcount; *q++ = CR; } *q++ = ch; } /* write the lf buf and update total */ if ( WriteFile( (HANDLE)_osfhnd[fh], lfbuf, q - lfbuf, (LPDWORD)&written, NULL) ) { charcount += written; if (written < q - lfbuf) break; } else { dosretval = GetLastError(); break; } } } else { /* binary mode, no translation */ if ( WriteFile( (HANDLE)_osfhnd[fh], (LPVOID)buf, cnt, (LPDWORD)&written, NULL) ) { dosretval = 0; charcount = written; } else dosretval = GetLastError(); } #else /* ndef _WIN32_ */ #ifdef _MAC_ } } TBD(); #else /* ndef _MAC_ */ #error ERROR - ONLY CRUISER, WIN32, OR MAC TARGET SUPPORTED! #endif /* _MAC_ */ #endif /* _WIN32_ */ #endif /* _CRUISER_ */ if (charcount == 0) { /* If nothing was written, first check if an OS/2 error, otherwise we return -1 and set errno to ENOSPC, unless a device and first char was CTRL-Z */ if (dosretval != 0) { /* OS/2 error happened, map error */ if (dosretval == ERROR_ACCESS_DENIED) { /* wrong read/write mode should return EBADF, not EACCES */ errno = EBADF; _doserrno = dosretval; } else _dosmaperr(dosretval); return -1; } else if ((_osfile[fh] & FDEV) && *(char *)buf == CTRLZ) return 0; else { errno = ENOSPC; _doserrno = 0; /* no OS/2 error */ return -1; } } else /* return adjusted bytes written */ return charcount - lfcount; }