297 lines
12 KiB
C
297 lines
12 KiB
C
/* PDCLib I/O support <_PDCLIB_io.h>
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This file is part of the Public Domain C Library (PDCLib).
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Permission is granted to use, modify, and / or redistribute at will.
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*/
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#ifndef __PDCLIB_IO_H
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#define __PDCLIB_IO_H __PDCLIB_IO_H
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#include "_PDCLIB_int.h"
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#include "_PDCLIB_threadconfig.h"
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/* Flags for representing mode (see fopen()). Note these must fit the same
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status field as the _IO?BF flags in <stdio.h> and the internal flags below.
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*/
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#define _PDCLIB_FREAD 8u
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#define _PDCLIB_FWRITE 16u
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#define _PDCLIB_FAPPEND 32u
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#define _PDCLIB_FRW 64u
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#define _PDCLIB_FBIN 128u
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/* Internal flags, made to fit the same status field as the flags above. */
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/* -------------------------------------------------------------------------- */
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/* free() the buffer memory on closing (false for user-supplied buffer) */
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#define _PDCLIB_FREEBUFFER 512u
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/* stream has encountered error / EOF */
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#define _PDCLIB_ERRORFLAG 1024u
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#define _PDCLIB_EOFFLAG 2048u
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/* stream is wide-oriented */
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#define _PDCLIB_WIDESTREAM 4096u
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/* stream is byte-oriented */
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#define _PDCLIB_BYTESTREAM 8192u
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/* file associated with stream should be remove()d on closing (tmpfile()) */
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#define _PDCLIB_DELONCLOSE 16384u
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/* stream handle should not be free()d on close (stdin, stdout, stderr) */
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#define _PDCLIB_STATIC 32768u
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union _PDCLIB_fd
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{
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#if defined(_PDCLIB_OSFD_T)
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_PDCLIB_OSFD_T osfd;
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#endif
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void * pointer;
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_PDCLIB_uintptr_t uval;
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_PDCLIB_intptr_t sval;
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};
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/******************************************************************************/
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/* Internal functions */
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/******************************************************************************/
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/* The worker for all printf() type of functions. The pointer spec should point
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to the introducing '%' of a conversion specifier. The status structure is to
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be that of the current printf() function, of which the members n, s, stream
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and arg will be preserved; i will be updated; and all others will be trashed
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by the function.
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Returns the number of characters parsed as a conversion specifier (0 if none
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parsed); returns -1 if the underlying I/O callback returns failure.
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*/
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int _PDCLIB_print( const char * spec, struct _PDCLIB_status_t * status );
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/* The worker for all scanf() type of functions. The pointer spec should point
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to the introducing '%' of a conversion specifier. The status structure is to
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be that of the current scanf() function, of which the member stream will be
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preserved; n, i, and s will be updated; and all others will be trashed by
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the function.
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Returns a pointer to the first character not parsed as conversion specifier,
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or NULL in case of error.
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FIXME: Should distinguish between matching and input error
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*/
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const char * _PDCLIB_scan( const char * spec, struct _PDCLIB_status_t * status );
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/* Parsing any fopen() style filemode string into a number of flags. */
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unsigned int _PDCLIB_filemode( const char * mode );
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/* Sanity checking and preparing of read buffer, should be called first thing
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by any stdio read-data function.
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Returns 0 on success, EOF on error.
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On error, EOF / error flags and errno are set appropriately.
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*/
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int _PDCLIB_prepread( _PDCLIB_file_t * stream );
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/* Sanity checking, should be called first thing by any stdio write-data
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function.
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Returns 0 on success, EOF on error.
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On error, error flags and errno are set appropriately.
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*/
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int _PDCLIB_prepwrite( _PDCLIB_file_t * stream );
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/* Closing all streams on program exit */
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void _PDCLIB_closeall( void );
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/* Writes a stream's buffer.
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Returns 0 on success, EOF on write error.
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Sets stream error flags and errno appropriately on error.
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*/
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int _PDCLIB_flushbuffer( _PDCLIB_file_t * stream );
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/* Fills a stream's buffer.
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Returns 0 on success, EOF on read error / EOF.
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Sets stream EOF / error flags and errno appropriately on error.
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*/
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int _PDCLIB_fillbuffer( _PDCLIB_file_t * stream );
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/* Repositions within a file. Returns new offset on success,
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-1 / errno on error.
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*/
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_PDCLIB_int_fast64_t _PDCLIB_seek( _PDCLIB_file_t * stream,
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_PDCLIB_int_fast64_t offset, int whence );
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/* File backend I/O operations
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*
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* PDCLib will call through to these methods as needed to implement the stdio
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* functions.
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*/
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struct _PDCLIB_fileops
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{
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/*! Read length bytes from the file into buf; returning the number of bytes
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* actually read in *numBytesRead.
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*
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* Returns true if bytes were read successfully; on end of file, returns
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* true with *numBytesRead == 0.
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*
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* On error, returns false and sets errno appropriately. *numBytesRead is
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* ignored in this situation.
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*/
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_PDCLIB_bool (*read)( _PDCLIB_fd_t self,
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void * buf,
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_PDCLIB_size_t length,
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_PDCLIB_size_t * numBytesRead );
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/*! Write length bytes to the file from buf; returning the number of bytes
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* actually written in *numBytesWritten
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*
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* Returns true if bytes were written successfully. On error, returns false
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* and setss errno appropriately (as with read, *numBytesWritten is
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* ignored)
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*/
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_PDCLIB_bool (*write)( _PDCLIB_fd_t self, const void * buf,
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_PDCLIB_size_t length, _PDCLIB_size_t * numBytesWritten );
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/* Seek to the file offset specified by offset, from location whence, which
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* may be one of the standard constants SEEK_SET/SEEK_CUR/SEEK_END
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*/
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_PDCLIB_bool (*seek)( _PDCLIB_fd_t self, _PDCLIB_int_fast64_t offset,
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int whence, _PDCLIB_int_fast64_t *newPos );
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void (*close)( _PDCLIB_fd_t self );
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/*! Behaves as read does, except for wide characters. Both length and
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* *numCharsRead represent counts of characters, not bytes.
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*
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* This function is optional; if missing, PDCLib will buffer the character
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* data as bytes and perform translation directly into the user's buffers.
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* It is useful if your backend can directly take wide characters (for
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* example, the Windows console)
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*/
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_PDCLIB_bool (*wread)( _PDCLIB_fd_t self, _PDCLIB_wchar_t * buf,
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_PDCLIB_size_t length, _PDCLIB_size_t * numCharsRead );
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/* Behaves as write does, except for wide characters. As with wread, both
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* length and *numCharsWritten are character counts.
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*
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* This function is also optional; if missing, PDCLib will buffer the
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* character data as bytes and do translation directly from the user's
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* buffers. You only need to implement this if your backend can directly
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* take wide characters (for example, the Windows console)
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*/
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_PDCLIB_bool (*wwrite)( _PDCLIB_fd_t self, const _PDCLIB_wchar_t * buf,
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_PDCLIB_size_t length, _PDCLIB_size_t * numCharsWritten );
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};
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/* struct _PDCLIB_file structure */
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struct _PDCLIB_file
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{
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const _PDCLIB_fileops_t * ops;
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_PDCLIB_fd_t handle; /* OS file handle */
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_PDCLIB_MTX_T lock; /* file lock */
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char * buffer; /* Pointer to buffer memory */
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_PDCLIB_size_t bufsize; /* Size of buffer */
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_PDCLIB_size_t bufidx; /* Index of current position in buffer */
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_PDCLIB_size_t bufend; /* Index of last pre-read character in buffer */
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#ifdef _PDCLIB_NEED_EOL_TRANSLATION
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_PDCLIB_size_t bufnlexp; /* Current position of buffer newline expansion */
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#endif
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_PDCLIB_size_t ungetidx; /* Number of ungetc()'ed characters */
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unsigned char * ungetbuf; /* ungetc() buffer */
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unsigned int status; /* Status flags; see above */
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/* multibyte parsing status to be added later */
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_PDCLIB_fpos_t pos; /* Offset and multibyte parsing state */
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char * filename; /* Name the current stream has been opened with */
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_PDCLIB_file_t * next; /* Pointer to next struct (internal) */
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};
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static inline _PDCLIB_size_t _PDCLIB_getchars( char * out, _PDCLIB_size_t n,
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int stopchar,
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_PDCLIB_file_t * stream )
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{
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_PDCLIB_size_t i = 0;
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int c;
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while ( stream->ungetidx > 0 && i != n )
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{
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c = (unsigned char)
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( out[ i++ ] = stream->ungetbuf[ --(stream->ungetidx) ] );
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if( c == stopchar )
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return i;
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}
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while ( i != n )
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{
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while ( stream->bufidx != stream->bufend && i != n)
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{
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c = (unsigned char) stream->buffer[ stream->bufidx++ ];
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#ifdef _PDCLIB_NEED_EOL_TRANSLATION
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if ( !( stream->status & _PDCLIB_FBIN ) && c == '\r' )
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{
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if ( stream->bufidx == stream->bufend )
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break;
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if ( stream->buffer[ stream->bufidx ] == '\n' )
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{
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c = '\n';
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stream->bufidx++;
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}
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}
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#endif
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out[ i++ ] = c;
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if( c == stopchar )
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return i;
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}
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if ( i != n )
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{
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if( _PDCLIB_fillbuffer( stream ) == -1 )
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{
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break;
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}
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}
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}
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#ifdef _PDCLIB_NEED_EOL_TRANSLATION
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if ( i != n && stream->bufidx != stream->bufend )
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{
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// we must have EOF'd immediately after a \r
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out[ i++ ] = stream->buffer[ stream->bufidx++ ];
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}
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#endif
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return i;
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}
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/* Unlocked functions - internal names
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*
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* We can't use the functions using their "normal" names internally because that
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* would cause namespace leakage. Therefore, we use them by prefixed internal
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* names
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*/
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void _PDCLIB_flockfile(struct _PDCLIB_file *file) _PDCLIB_nothrow;
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int _PDCLIB_ftrylockfile(struct _PDCLIB_file *file) _PDCLIB_nothrow;
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void _PDCLIB_funlockfile(struct _PDCLIB_file *file) _PDCLIB_nothrow;
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int _PDCLIB_getc_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_getchar_unlocked(void) _PDCLIB_nothrow;
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int _PDCLIB_putc_unlocked(int c, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_putchar_unlocked(int c) _PDCLIB_nothrow;
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void _PDCLIB_clearerr_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_feof_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_ferror_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_fflush_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_fgetc_unlocked(struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_fputc_unlocked(int c, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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_PDCLIB_size_t _PDCLIB_fread_unlocked(void *ptr, _PDCLIB_size_t size, _PDCLIB_size_t n, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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_PDCLIB_size_t _PDCLIB_fwrite_unlocked(const void *ptr, _PDCLIB_size_t size, _PDCLIB_size_t n, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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char *_PDCLIB_fgets_unlocked(char *s, int n, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_fputs_unlocked(const char *s, struct _PDCLIB_file *stream) _PDCLIB_nothrow;
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int _PDCLIB_fgetpos_unlocked( struct _PDCLIB_file * _PDCLIB_restrict stream, _PDCLIB_fpos_t * _PDCLIB_restrict pos ) _PDCLIB_nothrow;
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int _PDCLIB_fsetpos_unlocked( struct _PDCLIB_file * stream, const _PDCLIB_fpos_t * pos ) _PDCLIB_nothrow;
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long int _PDCLIB_ftell_unlocked( struct _PDCLIB_file * stream ) _PDCLIB_nothrow;
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int _PDCLIB_fseek_unlocked( struct _PDCLIB_file * stream, long int offset, int whence ) _PDCLIB_nothrow;
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void _PDCLIB_rewind_unlocked( struct _PDCLIB_file * stream ) _PDCLIB_nothrow;
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int _PDCLIB_puts_unlocked( const char * s ) _PDCLIB_nothrow;
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int _PDCLIB_ungetc_unlocked( int c, struct _PDCLIB_file * stream ) _PDCLIB_nothrow;
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int _PDCLIB_printf_unlocked( const char * _PDCLIB_restrict format, ... ) _PDCLIB_nothrow;
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int _PDCLIB_vprintf_unlocked( const char * _PDCLIB_restrict format, _PDCLIB_va_list arg ) _PDCLIB_nothrow;
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int _PDCLIB_fprintf_unlocked( struct _PDCLIB_file * _PDCLIB_restrict stream, const char * _PDCLIB_restrict format, ... ) _PDCLIB_nothrow;
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int _PDCLIB_vfprintf_unlocked( struct _PDCLIB_file * _PDCLIB_restrict stream, const char * _PDCLIB_restrict format, _PDCLIB_va_list arg ) _PDCLIB_nothrow;
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int _PDCLIB_scanf_unlocked( const char * _PDCLIB_restrict format, ... ) _PDCLIB_nothrow;
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int _PDCLIB_vscanf_unlocked( const char * _PDCLIB_restrict format, _PDCLIB_va_list arg ) _PDCLIB_nothrow;
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int _PDCLIB_fscanf_unlocked( struct _PDCLIB_file * _PDCLIB_restrict stream, const char * _PDCLIB_restrict format, ... ) _PDCLIB_nothrow;
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int _PDCLIB_vfscanf_unlocked( struct _PDCLIB_file * _PDCLIB_restrict stream, const char * _PDCLIB_restrict format, _PDCLIB_va_list arg ) _PDCLIB_nothrow;
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#endif
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