-
Notifications
You must be signed in to change notification settings - Fork 107
/
ndml_cstr.c
126 lines (111 loc) · 3.29 KB
/
ndml_cstr.c
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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/*
* Copyright (c) 2000
* Traakan, Inc., Los Altos, CA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Project: NDMJOB
* Ident: $Id: $
*
* Description:
* Convert strings to/from a canonical strings (CSTR).
*
* The main reason for this is to eliminate spaces
* in strings thus making multiple strings easily
* delimited by white space.
*
* Canonical strings use the HTTP convention of
* percent sign followed by two hex digits (%xx).
* Characters outside the printable ASCII range,
* space, and percent sign are so converted.
*
* Both interfaces return the length of the resulting
* string, -1 if there is an overflow, or -2
* there is a conversion error.
*/
#include "ndmlib.h"
static char ndmcstr_to_hex[] = "0123456789ABCDEF";
extern int ndmcstr_from_hex (int c);
int
ndmcstr_from_str (char *src, char *dst, unsigned dst_max)
{
unsigned char * p = (unsigned char *)src;
unsigned char * q = (unsigned char *)dst;
unsigned char * q_end = q + dst_max - 1;
int c;
while ((c = *p++) != 0) {
if (c <= ' ' || c > 0x7E || c == NDMCSTR_WARN) {
if (q+3 > q_end)
return -1;
*q++ = NDMCSTR_WARN;
*q++ = ndmcstr_to_hex[(c>>4)&0xF];
*q++ = ndmcstr_to_hex[c&0xF];
} else {
if (q+1 > q_end)
return -1;
*q++ = c;
}
}
*q = 0;
return q - (unsigned char *)dst;
}
int
ndmcstr_to_str (char *src, char *dst, unsigned dst_max)
{
unsigned char * p = (unsigned char *)src;
unsigned char * q = (unsigned char *)dst;
unsigned char * q_end = q + dst_max - 1;
int c, c1, c2;
while ((c = *p++) != 0) {
if (q+1 > q_end)
return -1;
if (c != NDMCSTR_WARN) {
*q++ = c;
continue;
}
c1 = ndmcstr_from_hex (p[0]);
c2 = ndmcstr_from_hex (p[1]);
if (c1 < 0 || c2 < 0) {
/* busted conversion */
return -2;
}
c = (c1<<4) + c2;
*q++ = c;
p += 2;
}
*q = 0;
return q - (unsigned char *)dst;
}
int
ndmcstr_from_hex (int c)
{
if ('0' <= c && c <= '9')
return c - '0';
if ('a' <= c && c <= 'f')
return (c - 'a') + 10;
if ('A' <= c && c <= 'F')
return (c - 'A') + 10;
return -1;
}