-
Notifications
You must be signed in to change notification settings - Fork 183
/
utils.c
161 lines (141 loc) · 4 KB
/
utils.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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/* source: utils.c */
/* Copyright Gerhard Rieger 2001-2009 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* useful additions to C library */
#include "config.h"
#include "sysincludes.h"
#include "compat.h" /* socklen_t */
#include "mytypes.h"
#include "sycls.h"
#include "utils.h"
#if !HAVE_MEMRCHR
/* GNU extension, available since glibc 2.1.91 */
void *memrchr(const void *s, int c, size_t n) {
const unsigned char *t = ((unsigned char *)s)+n;
while (--t >= (unsigned char *)s) {
if (*t == c) break;
}
if (t < (unsigned char *)s)
return NULL;
return (void *)t;
}
#endif /* !HAVE_MEMRCHR */
void *memdup(const void *src, size_t n) {
void *dest;
if ((dest = Malloc(n)) == NULL) {
return NULL;
}
memcpy(dest, src, n);
return dest;
}
/* search the keyword-table for a match of the leading part of name. */
/* returns the pointer to the matching field of the keyword or NULL if no
keyword was found. */
const struct wordent *keyw(const struct wordent *keywds, const char *name, unsigned int nkeys) {
unsigned int lower, upper, mid;
int r;
lower = 0;
upper = nkeys;
while (upper - lower > 1)
{
mid = (upper + lower) >> 1;
if (!(r = strcasecmp(keywds[mid].name, name)))
{
return &keywds[mid];
}
if (r < 0)
lower = mid;
else
upper = mid;
}
if (nkeys > 0 && !(strcasecmp(keywds[lower].name, name)))
{
return &keywds[lower];
}
return NULL;
}
/* Linux: setenv(), AIX: putenv() */
#if !HAVE_SETENV
int setenv(const char *name, const char *value, int overwrite) {
int result;
char *env;
if (!overwrite) {
if (getenv(name)) return 0; /* already exists */
}
if ((env = Malloc(strlen(name)+strlen(value)+2)) == NULL) {
return -1;
}
sprintf(env, "%s=%s", name, value);
if ((result = putenv(env)) != 0) { /* AIX docu says "... nonzero ..." */
free(env);
result = -1;
}
/* linux "man putenv" says: ...this string becomes part of the environment*/
return result;
}
#endif /* !HAVE_SETENV */
/* sanitize an "untrusted" character. output buffer must provide at least 5
characters space.
Does not append null. returns length out output (currently: max 4) */
static size_t sanitize_char(char c, char *o, int style) {
int hn; /* high nibble */
int ln; /* low nibble */
int n; /* written chars */
if (isprint(c)) {
*o = c;
return 1;
}
*o++ = '\\';
n = 2;
switch (c) {
case '\0': *o++ = '0'; break;
case '\a': *o++ = 'a'; break;
case '\b': *o++ = 'b'; break;
case '\t': *o++ = 't'; break;
case '\n': *o++ = 'n'; break;
case '\v': *o++ = 'v'; break;
case '\f': *o++ = 'f'; break;
case '\r': *o++ = 'r'; break;
case '\'': *o++ = '\''; break;
case '\"': *o++ = '"'; break;
case '\\': *o++ = '\\'; break;
default:
*o++ = 'x';
hn = (c>>4)&0x0f;
ln = c&0x0f;
*o++ = (hn>=10 ? (('A'-1)+(hn-10)) : ('0'+hn));
*o++ = (ln>=10 ? (('A'-1)+(ln-10)) : ('0'+ln));
n = 4;
}
return n;
}
/* sanitize "untrusted" text, replacing special control characters with the C
string version ("\x"), and replacing unprintable chars with ".".
text can grow to four times of input, so keep output buffer long enough!
returns a pointer to the first untouched byte of the output buffer.
*/
char *sanitize_string(const char *data, /* input data */
size_t bytes, /* length of input data, >=0 */
char *coded, /* output buffer, must be long enough */
int style
) {
int c;
while (bytes > 0) {
c = *(unsigned char *)data++;
coded += sanitize_char(c, coded, style);
--bytes;
}
return coded;
}
/* copies a substring out of a given buff
returns scratch, \0 terminated; scratch must provide len+1 bytes
*/
char *xiosubstr(char *scratch, const char *str, size_t from, size_t len) {
char *scratch0 = scratch;
str += from;
while (len--) {
*scratch++ = *str++;
}
*scratch = '\0';
return scratch0;
}