imapext-2007
view src/c-client/flstring.c @ 0:ada5e610ab86
imap-2007e
| author | yuuji@gentei.org |
|---|---|
| date | Mon, 14 Sep 2009 15:17:45 +0900 |
| parents | |
| children |
line source
1 /* ========================================================================
2 * Copyright 1988-2006 University of Washington
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *
11 * ========================================================================
12 */
14 /*
15 * Program: File string routines
16 *
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
22 * Seattle, WA 98195
23 * Internet: MRC@CAC.Washington.EDU
24 *
25 * Date: 15 April 1997
26 * Last Edited: 6 December 2006
27 */
30 #include <stdio.h>
31 #include "mail.h"
32 #include "flstring.h"
34 /* String driver for stdio file strings */
36 static void file_string_init (STRING *s,void *data,unsigned long size);
37 static char file_string_next (STRING *s);
38 static void file_string_setpos (STRING *s,unsigned long i);
40 STRINGDRIVER file_string = {
41 file_string_init, /* initialize string structure */
42 file_string_next, /* get next byte in string structure */
43 file_string_setpos /* set position in string structure */
44 };
47 /* Initialize mail string structure for file
48 * Accepts: string structure
49 * pointer to string
50 * size of string
51 */
53 static void file_string_init (STRING *s,void *data,unsigned long size)
54 {
55 s->data = data; /* note file descriptor */
56 /* big enough for one byte */
57 s->chunk = s->curpos = (char *) &s->data1;
58 s->size = size; /* data size */
59 s->cursize = s->chunksize = 1;/* always call stdio */
60 file_string_setpos (s,0); /* initial offset is 0 */
61 }
64 /* Get next character from string
65 * Accepts: string structure
66 * Returns: character, string structure chunk refreshed
67 */
69 static char file_string_next (STRING *s)
70 {
71 char ret = *s->curpos;
72 s->offset++; /* advance position */
73 s->cursize = 1; /* reset size */
74 *s->curpos = (char) getc ((FILE *) s->data);
75 return ret;
76 }
79 /* Set string pointer position
80 * Accepts: string structure
81 * new position
82 */
84 static void file_string_setpos (STRING *s,unsigned long i)
85 {
86 s->offset = i; /* note new offset */
87 fseek ((FILE *) s->data,i,SEEK_SET);
88 /* in case using returnstringstruct hack */
89 s->chunk = s->curpos = (char *) &s->data1;
90 *s->curpos = (char) getc ((FILE *) s->data);
91 }