1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* public domain */
/* Quoted Printable on stdin -> converted data on stdout */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef _WIN32
#ifndef WIN32
#define WIN32
#endif
#endif
#ifdef WIN32
#include <io.h>
#include <fcntl.h>
#endif
const char *hexdigits = "0123456789ABCDEF";
const char *hexdigits2 = "0123456789abcdef";
int
main(void)
{
char line[2000], *start, *stop, *copy;
char *d1, *d2, c;
int lineno;
#ifdef WIN32
_setmode( _fileno(stdout), _O_BINARY);
#endif
line[sizeof line - 1] = 0;
lineno = 1;
while (fgets(line, sizeof line - 1, stdin)) {
lineno++;
start = line;
keep_processing:
for (stop = start; *stop && *stop != '=' && *stop != '\n'; stop++)
;
if (stop != line && *stop == '\n') {
copy = stop;
do {
copy--;
if (*copy != ' ' && *copy != '\t') {
copy++;
break;
}
} while (copy != line);
} else {
copy = stop;
}
while (start != copy) {
putchar(*start);
start++;
}
if (*stop == '\n') {
putchar(*stop);
lineno++;
continue;
} else if (*stop == 0) {
continue;
} else { /* *stop == '=' */
stop++;
if ((d1 = strchr(hexdigits, *(stop))) &&
(d2 = strchr(hexdigits, *(stop+1)))) {
c = (d1 - hexdigits) * 16 + (d2 - hexdigits);
putchar(c);
stop += 2;
} else if ((d1 = strchr(hexdigits2, *(stop))) &&
(d2 = strchr(hexdigits2, *(stop+1)))) {
c = (d1 - hexdigits2) * 16 + (d2 - hexdigits2);
putchar(c);
stop += 2;
} else if (*stop == '\n') {
/* soft line break */
stop++;
} else if (*stop == '\r') {
/*
* Assume the user's lousy delivery software
* didn't convert from Internet's CRLF newline
* convention to the local LF convention.
*/
stop++;
} else if (*stop == ' ' || *stop == '\t') {
/* garbage added in transit */
for (stop++; *stop && (*stop == ' ' || *stop == '\t'); stop++)
;
} else {
fprintf(stderr, "qp-decode:line %d: something other than line break or hex digits after = in quoted-printable encoding\n", lineno);
exit(1);
}
start = stop;
goto keep_processing;
}
}
exit(0);
}
|
