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#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
do_abort()
{
/*
* 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);
}
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);
}
void
EF_Printv(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_Abortv(const char * pattern, va_list args)
{
EF_Print("\nElectricFence Aborting: ");
EF_Printv(pattern, args);
EF_Print("\n");
do_abort();
}
void
EF_Abort(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
EF_Abortv(pattern, args);
/* Not reached: va_end(args); */
}
void
EF_Exitv(const char * pattern, va_list args)
{
EF_Print("\nElectricFence Exiting: ");
EF_Printv(pattern, args);
EF_Print("\n");
/*
* I use _exit() because the regular exit() flushes stdio,
* which may cause malloc() or free() to be called.
*/
_exit(-1);
}
void
EF_Exit(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
EF_Exitv(pattern, args);
/* Not reached: va_end(args); */
}
void
EF_Print(const char * pattern, ...)
{
va_list args;
va_start(args, pattern);
EF_Printv(pattern, args);
va_end(args);
}
void
EF_InternalError(const char * pattern, ...)
{
va_list args;
EF_Print("\nInternal error in allocator: ");
va_start(args, pattern);
EF_Printv(pattern, args);
EF_Print("\n");
va_end(args);
do_abort();
}
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