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fdstring.c
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C/C++ Source or Header
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1998-09-16
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3KB
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102 lines
/*
* Program: File descriptor string routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 15 April 1997
* Last Edited: 1 May 1997
*
* Copyright 1997 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "mail.h"
#include "osdep.h"
#include "misc.h"
#include "fdstring.h"
/* String driver for fd stringstructs */
STRINGDRIVER fd_string = {
fd_string_init, /* initialize string structure */
fd_string_next, /* get next byte in string structure */
fd_string_setpos /* set position in string structure */
};
/* Initialize string structure for fd stringstruct
* Accepts: string structure
* pointer to string
* size of string
*/
void fd_string_init (STRING *s,void *data,unsigned long size)
{
FDDATA *d = (FDDATA *) data;
s->data = (void *) d->fd; /* note fd */
s->data1 = d->pos; /* note file offset */
s->size = size; /* note size */
s->curpos = s->chunk = d->chunk;
s->chunksize = (unsigned long) d->chunksize;
s->offset = 0; /* initial position */
/* and size of data */
s->cursize = min (s->chunksize,size);
/* move to that position in the file */
lseek (d->fd,d->pos,L_SET);
read (d->fd,s->chunk,(size_t) s->cursize);
}
/* Get next character from fd stringstruct
* Accepts: string structure
* Returns: character, string structure chunk refreshed
*/
char fd_string_next (STRING *s)
{
char c = *s->curpos++; /* get next byte */
SETPOS (s,GETPOS (s)); /* move to next chunk */
return c; /* return the byte */
}
/* Set string pointer position for fd stringstruct
* Accepts: string structure
* new position
*/
void fd_string_setpos (STRING *s,unsigned long i)
{
if (i > s->size) i = s->size; /* don't permit setting beyond EOF */
s->offset = i; /* set new offset */
s->curpos = s->chunk; /* reset position */
/* set size of data */
if (s->cursize = min (s->chunksize,SIZE (s))) {
/* move to that position in the file */
lseek ((int) s->data,s->data1 + s->offset,L_SET);
read ((int) s->data,s->curpos,(size_t) s->cursize);
}
}