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/* $OpenBSD: utils.c,v 1.2 2016/01/08 16:17:31 ratchov Exp $ */
/*
* Copyright (c) 2003-2012 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.
*/
/*
* log_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 <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include "utils.h"
/*
* log buffer size
*/
#define LOG_BUFSZ 8192
/*
* store a character in the log
*/
#define LOG_PUTC(c) do { \
if (log_used < LOG_BUFSZ) \
log_buf[log_used++] = (c); \
} while (0)
char log_buf[LOG_BUFSZ]; /* buffer where traces are stored */
unsigned int log_used = 0; /* bytes used in the buffer */
unsigned int log_sync = 1; /* if true, flush after each '\n' */
/*
* write the log buffer on stderr
*/
void
log_flush(void)
{
if (log_used == 0)
return;
write(STDERR_FILENO, log_buf, log_used);
log_used = 0;
}
/*
* store a string in the log
*/
void
log_puts(char *msg)
{
char *p = msg;
int c;
while ((c = *p++) != '\0') {
LOG_PUTC(c);
if (log_sync && c == '\n')
log_flush();
}
}
/*
* store a hex in the log
*/
void
log_putx(unsigned long num)
{
char dig[sizeof(num) * 2], *p = dig, c;
unsigned int 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;
LOG_PUTC(c);
}
} else
LOG_PUTC('0');
}
/*
* store a unsigned decimal in the log
*/
void
log_putu(unsigned long num)
{
char dig[sizeof(num) * 3], *p = dig;
unsigned int ndig;
if (num != 0) {
for (ndig = 0; num != 0; ndig++) {
*p++ = num % 10;
num /= 10;
}
for (; ndig != 0; ndig--)
LOG_PUTC(*(--p) + '0');
} else
LOG_PUTC('0');
}
/*
* store a signed decimal in the log
*/
void
log_puti(long num)
{
if (num < 0) {
LOG_PUTC('-');
num = -num;
}
log_putu(num);
}
/*
* abort program execution after a fatal error
*/
void
panic(void)
{
log_flush();
(void)kill(getpid(), SIGABRT);
_exit(1);
}
/*
* allocate a (small) abount of memory, and abort if it fails
*/
void *
xmalloc(size_t size)
{
void *p;
p = malloc(size);
if (p == NULL) {
log_puts("failed to allocate ");
log_putx(size);
log_puts(" bytes\n");
panic();
}
return p;
}
/*
* free memory allocated with xmalloc()
*/
void
xfree(void *p)
{
free(p);
}
/*
* xmalloc-style strdup(3)
*/
char *
xstrdup(char *s)
{
size_t size;
void *p;
size = strlen(s) + 1;
p = xmalloc(size);
memcpy(p, s, size);
return p;
}
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