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#ifdef DEBUG
/*
* Copyright (c) 2003-2007 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* dbg_xxx() routines are used to quickly store traces into a trace buffer.
* This allows trances to be collected during time sensitive operations without
* disturbing them. The buffer can be flushed on standard error later, when
* slow syscalls are no longer disruptive, e.g. at the end of the poll() loop.
*/
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include "dbg.h"
/*
* size of the buffer where traces are stored
*/
#define DBG_BUFSZ 8192
/*
* store a character in the trace buffer
*/
#define DBG_PUTC(c) do { \
if (dbg_used < DBG_BUFSZ) \
dbg_buf[dbg_used++] = (c); \
} while (0)
char dbg_buf[DBG_BUFSZ]; /* buffer where traces are stored */
unsigned dbg_used = 0; /* bytes used in the buffer */
unsigned dbg_sync = 1; /* if true, flush after each '\n' */
/*
* write debug info buffer on stderr
*/
void
dbg_flush(void)
{
if (dbg_used == 0)
return;
write(STDERR_FILENO, dbg_buf, dbg_used);
dbg_used = 0;
}
/*
* store a string in the debug buffer
*/
void
dbg_puts(char *msg)
{
char *p = msg;
int c;
while ((c = *p++) != '\0') {
DBG_PUTC(c);
if (dbg_sync && c == '\n')
dbg_flush();
}
}
/*
* store a hex in the debug buffer
*/
void
dbg_putx(unsigned long num)
{
char dig[sizeof(num) * 2], *p = dig, c;
unsigned ndig;
if (num != 0) {
for (ndig = 0; num != 0; ndig++) {
*p++ = num & 0xf;
num >>= 4;
}
for (; ndig != 0; ndig--) {
c = *(--p);
c += (c < 10) ? '0' : 'a' - 10;
DBG_PUTC(c);
}
} else
DBG_PUTC('0');
}
/*
* store a decimal in the debug buffer
*/
void
dbg_putu(unsigned long num)
{
char dig[sizeof(num) * 3], *p = dig;
unsigned ndig;
if (num != 0) {
for (ndig = 0; num != 0; ndig++) {
*p++ = num % 10;
num /= 10;
}
for (; ndig != 0; ndig--)
DBG_PUTC(*(--p) + '0');
} else
DBG_PUTC('0');
}
/*
* store a signed integer in the trace buffer
*/
void
dbg_puti(long num)
{
if (num < 0) {
DBG_PUTC('-');
num = -num;
}
dbg_putu(num);
}
/*
* abort program execution after a fatal error, we should
* put code here to backup user data
*/
void
dbg_panic(void)
{
dbg_flush();
abort();
}
#endif
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