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
162
163
164
165
166
167
168
169
170
|
#include "efence.h"
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
/*
* These routines do their printing without using stdio. Stdio can't
* be used because it calls malloc(). Internal routines of a malloc()
* debugger should not re-enter malloc(), so stdio is out.
*/
/*
* NUMBER_BUFFER_SIZE is the longest character string that could be needed
* to represent an unsigned integer, assuming we might print in base 2.
*/
#define NUMBER_BUFFER_SIZE (sizeof(ef_number) * NBBY)
static void
printNumber(ef_number number, ef_number base)
{
char buffer[NUMBER_BUFFER_SIZE];
char * s = &buffer[NUMBER_BUFFER_SIZE];
int size;
do {
ef_number digit;
if ( --s == buffer )
EF_Abort("Internal error printing number.");
digit = number % base;
if ( digit < 10 )
*s = '0' + digit;
else
*s = 'a' + digit - 10;
} while ( (number /= base) > 0 );
size = &buffer[NUMBER_BUFFER_SIZE] - s;
if ( size > 0 )
write(2, s, size);
}
static void
vprint(const char * pattern, va_list args)
{
static const char bad_pattern[] =
"\nBad pattern specifier %%%c in EF_Print().\n";
const char * s = pattern;
char c;
while ( (c = *s++) != '\0' ) {
if ( c == '%' ) {
c = *s++;
switch ( c ) {
case '%':
(void) write(2, &c, 1);
break;
case 'a':
/*
* Print an address passed as a void pointer.
* The type of ef_number must be set so that
* it is large enough to contain all of the
* bits of a void pointer.
*/
printNumber(
(ef_number)va_arg(args, void *)
,0x10);
break;
case 's':
{
const char * string;
size_t length;
string = va_arg(args, char *);
length = strlen(string);
(void) write(2, string, length);
}
break;
case 'd':
{
int n = va_arg(args, int);
if ( n < 0 ) {
char c = '-';
write(2, &c, 1);
n = -n;
}
printNumber(n, 10);
}
break;
case 'x':
printNumber(va_arg(args, u_int), 0x10);
break;
case 'c':
{ /*Cast used, since char gets promoted to int in ... */
char c = (char) va_arg(args, int);
(void) write(2, &c, 1);
}
break;
default:
{
EF_Print(bad_pattern, c);
}
}
}
else
(void) write(2, &c, 1);
}
}
void
EF_Abort(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
EF_Print("\nElectricFence Aborting: ");
vprint(pattern, args);
EF_Print("\n");
va_end(args);
/*
* I use kill(getpid(), SIGILL) instead of abort() because some
* mis-guided implementations of abort() flush stdio, which can
* cause malloc() or free() to be called.
*/
kill(getpid(), SIGILL);
/* Just in case something handles SIGILL and returns, exit here. */
_exit(-1);
}
void
EF_Exit(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
EF_Print("\nElectricFence Exiting: ");
vprint(pattern, args);
EF_Print("\n");
va_end(args);
/*
* I use _exit() because the regular exit() flushes stdio,
* which may cause malloc() or free() to be called.
*/
_exit(-1);
}
void
EF_Print(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
vprint(pattern, args);
va_end(args);
}
|
