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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* 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: 6 December 2006
*/
#include <stdio.h>
#include "mail.h"
#include "flstring.h"
/* String driver for stdio file strings */
static void file_string_init (STRING *s,void *data,unsigned long size);
static char file_string_next (STRING *s);
static void file_string_setpos (STRING *s,unsigned long i);
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
*/
static 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
*/
static 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
*/
static void file_string_setpos (STRING *s,unsigned long i)
{
s->offset = i; /* note new offset */
fseek ((FILE *) s->data,i,SEEK_SET);
/* in case using returnstringstruct hack */
s->chunk = s->curpos = (char *) &s->data1;
*s->curpos = (char) getc ((FILE *) s->data);
}
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