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flstring.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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95 lines
/*
* Program: File 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: 15 April 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 <stdio.h>
#include "mail.h"
#include "osdep.h"
#include "misc.h"
#include "flstring.h"
/* String driver for stdio file strings */
STRINGDRIVER file_string = {
file_string_init, /* initialize string structure */
file_string_next, /* get next byte in string structure */
file_string_setpos /* set position in string structure */
};
/* Initialize mail string structure for file
* Accepts: string structure
* pointer to string
* size of string
*/
void file_string_init (STRING *s,void *data,unsigned long size)
{
s->data = data; /* note file descriptor */
/* big enough for one byte */
s->chunk = s->curpos = (char *) &s->data1;
s->size = size; /* data size */
s->cursize = s->chunksize = 1;/* always call stdio */
file_string_setpos (s,0); /* initial offset is 0 */
}
/* Get next character from string
* Accepts: string structure
* Returns: character, string structure chunk refreshed
*/
char file_string_next (STRING *s)
{
char ret = *s->curpos;
s->offset++; /* advance position */
s->cursize = 1; /* reset size */
*s->curpos = (char) getc ((FILE *) s->data);
return ret;
}
/* Set string pointer position
* Accepts: string structure
* new position
*/
void file_string_setpos (STRING *s,unsigned long i)
{
s->offset = i; /* note new offset */
fseek ((FILE *) s->data,i,L_SET);
*s->curpos = (char) getc ((FILE *) s->data);
}