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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Copyright 2013 Tobias Klauser.
* Subject to the GPL, version 2.
*/
#define _BSD_SOURCE
#include <ctype.h>
#include <stdio.h>
#include <stdarg.h>
#include <sys/ioctl.h>
#include "tprintf.h"
#include "die.h"
#include "locking.h"
#include "built_in.h"
#define term_trailing_size 5
#define term_starting_size 3
#define term_curr_size (get_tty_size() - term_trailing_size)
static char buffer[1024];
static volatile size_t buffer_use = 0;
static struct spinlock buffer_lock;
static int get_tty_size(void)
{
#ifdef TIOCGSIZE
struct ttysize ts = {0};
return (ioctl(0, TIOCGSIZE, &ts) == 0 ? ts.ts_cols : DEFAULT_TTY_SIZE);
#elif defined(TIOCGWINSZ)
struct winsize ts;
return (ioctl(0, TIOCGWINSZ, &ts) == 0 ? ts.ws_col : DEFAULT_TTY_SIZE);
#else
return DEFAULT_TTY_SIZE;
#endif
}
static inline void __tprintf_flush_newline(void)
{
int i;
fputc('\n', stdout);
for (i = 0; i < term_starting_size; ++i)
fputc(' ', stdout);
}
static inline int __tprintf_flush_skip(char *buf, int i)
{
int val = buf[i];
if (val == ' ' || val == ',')
return 1;
return 0;
}
static void __tprintf_flush(void)
{
size_t i;
static ssize_t line_count = 0;
ssize_t term_len = term_curr_size;
for (i = 0; i < buffer_use; ++i) {
if (buffer[i] == '\n') {
term_len = term_curr_size;
line_count = -1;
}
if (line_count == term_len) {
__tprintf_flush_newline();
line_count = term_starting_size;
while (i < buffer_use &&
__tprintf_flush_skip(buffer, i))
i++;
}
fputc(buffer[i], stdout);
line_count++;
}
fflush(stdout);
buffer_use = 0;
}
void tprintf_flush(void)
{
spinlock_lock(&buffer_lock);
__tprintf_flush();
spinlock_unlock(&buffer_lock);
}
void tprintf_init(void)
{
spinlock_init(&buffer_lock);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
}
void tprintf_cleanup(void)
{
tprintf_flush();
spinlock_destroy(&buffer_lock);
}
void tprintf(char *msg, ...)
{
ssize_t ret;
ssize_t avail;
va_list vl;
spinlock_lock(&buffer_lock);
avail = sizeof(buffer) - buffer_use;
bug_on(avail < 0);
va_start(vl, msg);
ret = vsnprintf(buffer + buffer_use, avail, msg, vl);
va_end(vl);
if (ret < 0)
panic("vsnprintf screwed up in tprintf!\n");
if ((size_t) ret > sizeof(buffer))
panic("No mem in tprintf left!\n");
if (ret >= avail) {
__tprintf_flush();
avail = sizeof(buffer) - buffer_use;
bug_on(avail < 0);
va_start(vl, msg);
ret = vsnprintf(buffer + buffer_use, avail, msg, vl);
va_end(vl);
if (ret < 0)
panic("vsnprintf screwed up in tprintf!\n");
}
buffer_use += ret;
spinlock_unlock(&buffer_lock);
}
void tputchar_safe(int c)
{
unsigned char ch = (unsigned char)(c & 0xff);
if (isprint(ch))
tprintf("%c", ch);
else
tprintf("\\0x%02x", ch);
}
void tputs_safe(const char *str, size_t len)
{
while (len--) {
tputchar_safe(*str);
str++;
}
}
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