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/***************************************************************
MPU-GENOPS.C
This file contains generic stream dispatch operations.
PART OF : MPUIO - library .
USAGE : Internal only .
NOTE : Backend-specific operations are selected through
the FILE_plus jump table.
Copyright (C) 2000 - 2026 by Andrey V.Kosteltsev.
All Rights Reserved.
***************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <libmpuio.h>
#include <mpu-symbols.h>
#include <mpu-libio.h>
/***************************************************************
Finish backend-specific stream state before close/destruction.
***************************************************************/
int __mpu_IO_finish_unlocked( mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->finish == (int (*)(mpu_FILE *))0 )
return( 0 );
return( (*__MPU_IO_JUMPS( stream )->finish)( stream ) );
} /* End of __mpu_IO_finish_unlocked() */
/***************************************************************
Dispatch stream buffer configuration through the backend.
***************************************************************/
int __mpu_IO_setbuf_unlocked( mpu_FILE *stream, unsigned char *buf,
int mode, size_t size )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->setbuf ==
(int (*)(mpu_FILE *, unsigned char *, int, size_t))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( -1 );
}
return( (*__MPU_IO_JUMPS( stream )->setbuf)( stream, buf, mode, size ) );
} /* End of __mpu_IO_setbuf_unlocked() */
/***************************************************************
Seek relative to an origin and return the resulting position.
***************************************************************/
off_t __mpu_IO_seekoff_unlocked( mpu_FILE *stream,
off_t offset, int whence )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->seekoff ==
(off_t (*)(mpu_FILE *, off_t, int))0 )
{
errno = ESPIPE;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( (off_t)-1 );
}
return( (*__MPU_IO_JUMPS( stream )->seekoff)( stream, offset, whence ) );
} /* End of __mpu_IO_seekoff_unlocked() */
/***************************************************************
Seek to an absolute stream position and return that position.
***************************************************************/
off_t __mpu_IO_seekpos_unlocked( mpu_FILE *stream, off_t position )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->seekpos ==
(off_t (*)(mpu_FILE *, off_t))0 )
{
errno = ESPIPE;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( (off_t)-1 );
}
return( (*__MPU_IO_JUMPS( stream )->seekpos)( stream, position ) );
} /* End of __mpu_IO_seekpos_unlocked() */
/***************************************************************
Dispatch an input-buffer underflow operation through the backend.
***************************************************************/
int __mpu_IO_underflow_unlocked( mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->underflow == (int (*)(mpu_FILE *))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->underflow)( stream ) );
} /* End of __mpu_IO_underflow_unlocked() */
/***************************************************************
Dispatch an output-buffer overflow operation through the backend.
***************************************************************/
int __mpu_IO_overflow_unlocked( mpu_FILE *stream, int c )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->overflow ==
(int (*)(mpu_FILE *, int))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->overflow)( stream, c ) );
} /* End of __mpu_IO_overflow_unlocked() */
/***************************************************************
Dispatch a stream synchronization operation through the backend.
***************************************************************/
int __mpu_IO_sync_unlocked( mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->sync == (int (*)(mpu_FILE *))0 )
return( 0 );
return( (*__MPU_IO_JUMPS( stream )->sync)( stream ) );
} /* End of __mpu_IO_sync_unlocked() */
/***************************************************************
Dispatch the legacy flush operation through the backend.
***************************************************************/
int __mpu_IO_flush_unlocked( mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->flush == (int (*)(mpu_FILE *))0 )
return( 0 );
return( (*__MPU_IO_JUMPS( stream )->flush)( stream ) );
} /* End of __mpu_IO_flush_unlocked() */
/***************************************************************
Read one raw byte through the selected stream backend.
***************************************************************/
int __mpu_IO_get_byte_unlocked( mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->get_byte == (int (*)(mpu_FILE *))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->get_byte)( stream ) );
} /* End of __mpu_IO_get_byte_unlocked() */
/***************************************************************
Write one raw byte through the selected stream backend.
***************************************************************/
int __mpu_IO_put_byte_unlocked( unsigned char c, mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->put_byte ==
(int (*)(unsigned char, mpu_FILE *))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->put_byte)( c, stream ) );
} /* End of __mpu_IO_put_byte_unlocked() */
/***************************************************************
Read a raw byte block through the stream jump table. Backends
without xsgetn support fall back to get_byte operations.
***************************************************************/
size_t __mpu_IO_xsgetn_unlocked( mpu_FILE *stream,
void *data, size_t size )
{
unsigned char *p = (unsigned char *)data;
size_t done = 0;
if( __MPU_IO_JUMPS( stream ) != (const struct __mpu_IO_jump_t *)0 &&
__MPU_IO_JUMPS( stream )->xsgetn !=
(size_t (*)(mpu_FILE *, void *, size_t))0 )
return( (*__MPU_IO_JUMPS( stream )->xsgetn)( stream, data, size ) );
while( done < size )
{
int c = __mpu_IO_get_byte_unlocked( stream );
if( c == mpu_EOF ) break;
p[done++] = (unsigned char)c;
}
return( done );
} /* End of __mpu_IO_xsgetn_unlocked() */
/***************************************************************
Write a raw byte block through the stream jump table. Backends
without xsputn support fall back to put_byte operations.
***************************************************************/
size_t __mpu_IO_xsputn_unlocked( mpu_FILE *stream,
const void *data, size_t size )
{
const unsigned char *p = (const unsigned char *)data;
size_t done = 0;
if( __MPU_IO_JUMPS( stream ) != (const struct __mpu_IO_jump_t *)0 &&
__MPU_IO_JUMPS( stream )->xsputn !=
(size_t (*)(mpu_FILE *, const void *, size_t))0 )
return( (*__MPU_IO_JUMPS( stream )->xsputn)( stream, data, size ) );
while( done < size )
{
if( __mpu_IO_put_byte_unlocked( p[done], stream ) == mpu_EOF )
break;
++done;
}
return( done );
} /* End of __mpu_IO_xsputn_unlocked() */
/***************************************************************
Return one UCS-2 character from STREAM. Characters saved by
__mpu_IO_unget_char_unlocked() are returned before the backend.
***************************************************************/
int __mpu_IO_get_char_unlocked( mpu_FILE *stream, __mpu_char16_t *wc )
{
if( stream->_unget_count )
{
*wc = stream->_unget_chars[--stream->_unget_count];
stream->_flags &= ~__MPU_IO_EOF_SEEN;
return( 0 );
}
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->get_char ==
(int (*)(mpu_FILE *, __mpu_char16_t *))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->get_char)( stream, wc ) );
} /* End of __mpu_IO_get_char_unlocked() */
/***************************************************************
Push one UCS-2 character back to STREAM. The internal stack
permits scanner rollback of short prefixes/exponents; callers
may rely on at least one character of public mpu_ungetc().
***************************************************************/
int __mpu_IO_unget_char_unlocked( __mpu_char16_t wc, mpu_FILE *stream )
{
if( stream->_unget_count >=
sizeof(stream->_unget_chars) / sizeof(stream->_unget_chars[0]) )
{
errno = ENOSPC;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
if( wc >= (__mpu_char16_t)0xd800 && wc <= (__mpu_char16_t)0xdfff )
{
errno = EILSEQ;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
stream->_unget_chars[stream->_unget_count++] = wc;
stream->_flags &= ~__MPU_IO_EOF_SEEN;
return( (int)wc );
} /* End of __mpu_IO_unget_char_unlocked() */
/***************************************************************
Write one UCS-2 character through the selected stream backend.
***************************************************************/
int __mpu_IO_put_char_unlocked( __mpu_char16_t wc, mpu_FILE *stream )
{
if( __MPU_IO_JUMPS( stream ) == (const struct __mpu_IO_jump_t *)0 ||
__MPU_IO_JUMPS( stream )->put_char ==
(int (*)(__mpu_char16_t, mpu_FILE *))0 )
{
errno = EINVAL;
stream->_flags |= __MPU_IO_ERR_SEEN;
return( mpu_EOF );
}
return( (*__MPU_IO_JUMPS( stream )->put_char)( wc, stream ) );
} /* End of __mpu_IO_put_char_unlocked() */
/***************************************************************
Hide internal symbols:
***************************************************************/
__mpu_hidden_decl(__mpu_IO_finish_unlocked);
__mpu_hidden_decl(__mpu_IO_flush_unlocked);
__mpu_hidden_decl(__mpu_IO_get_byte_unlocked);
__mpu_hidden_decl(__mpu_IO_get_char_unlocked);
__mpu_hidden_decl(__mpu_IO_overflow_unlocked);
__mpu_hidden_decl(__mpu_IO_put_byte_unlocked);
__mpu_hidden_decl(__mpu_IO_put_char_unlocked);
__mpu_hidden_decl(__mpu_IO_seekoff_unlocked);
__mpu_hidden_decl(__mpu_IO_seekpos_unlocked);
__mpu_hidden_decl(__mpu_IO_setbuf_unlocked);
__mpu_hidden_decl(__mpu_IO_sync_unlocked);
__mpu_hidden_decl(__mpu_IO_underflow_unlocked);
__mpu_hidden_decl(__mpu_IO_unget_char_unlocked);
__mpu_hidden_decl(__mpu_IO_xsgetn_unlocked);
__mpu_hidden_decl(__mpu_IO_xsputn_unlocked);
/*
End of hide internal symbols.
***************************************************************/
/* End of mpu-genops.c */
|
