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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: File string routines
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 15 April 1997
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26 * Last Edited: 6 December 2006
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27 */
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28
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29
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30 #include <stdio.h>
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31 #include "mail.h"
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32 #include "flstring.h"
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33
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34 /* String driver for stdio file strings */
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35
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36 static void file_string_init (STRING *s,void *data,unsigned long size);
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37 static char file_string_next (STRING *s);
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38 static void file_string_setpos (STRING *s,unsigned long i);
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39
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40 STRINGDRIVER file_string = {
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41 file_string_init, /* initialize string structure */
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42 file_string_next, /* get next byte in string structure */
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43 file_string_setpos /* set position in string structure */
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44 };
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45
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46
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47 /* Initialize mail string structure for file
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48 * Accepts: string structure
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49 * pointer to string
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50 * size of string
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51 */
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52
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53 static void file_string_init (STRING *s,void *data,unsigned long size)
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54 {
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55 s->data = data; /* note file descriptor */
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56 /* big enough for one byte */
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57 s->chunk = s->curpos = (char *) &s->data1;
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58 s->size = size; /* data size */
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59 s->cursize = s->chunksize = 1;/* always call stdio */
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60 file_string_setpos (s,0); /* initial offset is 0 */
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61 }
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62
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63
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64 /* Get next character from string
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65 * Accepts: string structure
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66 * Returns: character, string structure chunk refreshed
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67 */
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68
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69 static char file_string_next (STRING *s)
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70 {
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71 char ret = *s->curpos;
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72 s->offset++; /* advance position */
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73 s->cursize = 1; /* reset size */
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74 *s->curpos = (char) getc ((FILE *) s->data);
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75 return ret;
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76 }
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77
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78
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79 /* Set string pointer position
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80 * Accepts: string structure
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81 * new position
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82 */
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83
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84 static void file_string_setpos (STRING *s,unsigned long i)
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85 {
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86 s->offset = i; /* note new offset */
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87 fseek ((FILE *) s->data,i,SEEK_SET);
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88 /* in case using returnstringstruct hack */
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89 s->chunk = s->curpos = (char *) &s->data1;
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90 *s->curpos = (char) getc ((FILE *) s->data);
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91 }
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