/*
 * 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++;
	}
}
i/linux/net-next.git/commit/init?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2'>init</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='packet-loop-back'/><input type='hidden' name='id' value='07021b43597f506cc525d139ed1a94e79cf184f2'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-10-07 20:19:31 -0700</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-10-07 20:19:31 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/init?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2'>07021b43597f506cc525d139ed1a94e79cf184f2</a> (<a href='/cgit.cgi/linux/net-next.git/patch/init?id=07021b43597f506cc525d139ed1a94e79cf184f2'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2'>888ab33ec69b397ae6f8a2c82d14197047ee827e</a> /<a href='/cgit.cgi/linux/net-next.git/tree/init?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2'>init</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/init?h=packet-loop-back&amp;id=d1f5323370fceaed43a7ee38f4c7bfc7e70f28d0'>d1f5323370fceaed43a7ee38f4c7bfc7e70f28d0</a> (<a href='/cgit.cgi/linux/net-next.git/diff/init?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2&amp;id2=d1f5323370fceaed43a7ee38f4c7bfc7e70f28d0'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/init?h=packet-loop-back&amp;id=b7b7013cac55d794940bd9cb7b7c55c9dececac4'>b7b7013cac55d794940bd9cb7b7c55c9dececac4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/init?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2&amp;id2=b7b7013cac55d794940bd9cb7b7c55c9dececac4'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux</div><div class='commit-msg'>Pull powerpc updates from Michael Ellerman:
 "Highlights:
   - Major rework of Book3S 64-bit exception vectors (Nicholas Piggin)
   - Use gas sections for arranging exception vectors et. al.
   - Large set of TM cleanups and selftests (Cyril Bur)
   - Enable transactional memory (TM) lazily for userspace (Cyril Bur)
   - Support for XZ compression in the zImage wrapper (Oliver
     O'Halloran)
   - Add support for bpf constant blinding (Naveen N. Rao)
   - Beginnings of upstream support for PA Semi Nemo motherboards
     (Darren Stevens)

  Fixes:
   - Ensure .mem(init|exit).text are within _stext/_etext (Michael
     Ellerman)
   - xmon: Don't use ld on 32-bit (Michael Ellerman)
   - vdso64: Use double word compare on pointers (Anton Blanchard)
   - powerpc/nvram: Fix an incorrect partition merge (Pan Xinhui)
   - powerpc: Fix usage of _PAGE_RO in hugepage (Christophe Leroy)
   - powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K
     (Aneesh Kumar K.V)
   - Fix memory leak in queue_hotplug_event() error path (Andrew
     Donnellan)
   - Replay hypervisor maintenance interrupt first (Nicholas Piggin)

  Various performance optimisations (Anton Blanchard):
   - Align hot loops of memset() and backwards_memcpy()
   - During context switch, check before setting mm_cpumask
   - Remove static branch prediction in atomic{, 64}_add_unless
   - Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little
     endian
   - Set default CPU type to POWER8 for little endian builds

  Cleanups &amp; features:
   - Sparse fixes/cleanups (Daniel Axtens)
   - Preserve CFAR value on SLB miss caused by access to bogus address
     (Paul Mackerras)
   - Radix MMU fixups for POWER9 (Aneesh Kumar K.V)
   - Support for setting used_(vsr|vr|spe) in sigreturn path (for CRIU)
     (Simon Guo)
   - Optimise syscall entry for virtual, relocatable case (Nicholas
     Piggin)
   - Optimise MSR handling in exception handling (Nicholas Piggin)
   - Support for kexec with Radix MMU (Benjamin Herrenschmidt)
   - powernv EEH fixes (Russell Currey)
   - Suprise PCI hotplug support for powernv (Gavin Shan)
   - Endian/sparse fixes for powernv PCI (Gavin Shan)
   - Defconfig updates (Anton Blanchard)
   - KVM: PPC: Book3S HV: Migrate pinned pages out of CMA (Balbir Singh)
   - cxl: Flush PSL cache before resetting the adapter (Frederic Barrat)
   - cxl: replace loop with for_each_child_of_node(), remove unneeded
     of_node_put() (Andrew Donnellan)
   - Fix HV facility unavailable to use correct handler (Nicholas
     Piggin)
   - Remove unnecessary syscall trampoline (Nicholas Piggin)
   - fadump: Fix build break when CONFIG_PROC_VMCORE=n (Michael
     Ellerman)
   - Quieten EEH message when no adapters are found (Anton Blanchard)
   - powernv: Add PHB register dump debugfs handle (Russell Currey)
   - Use kprobe blacklist for exception handlers &amp; asm functions
     (Nicholas Piggin)
   - Document the syscall ABI (Nicholas Piggin)
   - MAINTAINERS: Update cxl maintainers (Michael Neuling)
   - powerpc: Remove all usages of NO_IRQ (Michael Ellerman)

  Minor cleanups:
   - Andrew Donnellan, Christophe Leroy, Colin Ian King, Cyril Bur,
     Frederic Barrat, Pan Xinhui, PrasannaKumar Muralidharan, Rui Teng,
     Simon Guo"

* tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits)
  powerpc/bpf: Add support for bpf constant blinding
  powerpc/bpf: Implement support for tail calls
  powerpc/bpf: Introduce accessors for using the tmp local stack space
  powerpc/fadump: Fix build break when CONFIG_PROC_VMCORE=n
  powerpc: tm: Enable transactional memory (TM) lazily for userspace
  powerpc/tm: Add TM Unavailable Exception
  powerpc: Remove do_load_up_transact_{fpu,altivec}
  powerpc: tm: Rename transct_(*) to ck(\1)_state
  powerpc: tm: Always use fp_state and vr_state to store live registers
  selftests/powerpc: Add checks for transactional VSXs in signal contexts
  selftests/powerpc: Add checks for transactional VMXs in signal contexts
  selftests/powerpc: Add checks for transactional FPUs in signal contexts
  selftests/powerpc: Add checks for transactional GPRs in signal contexts
  selftests/powerpc: Check that signals always get delivered
  selftests/powerpc: Add TM tcheck helpers in C
  selftests/powerpc: Allow tests to extend their kill timeout
  selftests/powerpc: Introduce GPR asm helper header file
  selftests/powerpc: Move VMX stack frame macros to header file
  selftests/powerpc: Rework FPU stack placement macros and move to header file
  selftests/powerpc: Check for VSX preservation across userspace preemption
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=packet-loop-back&amp;id=07021b43597f506cc525d139ed1a94e79cf184f2'>Diffstat</a> (limited to 'init')</div><table summary='diffstat' class='diffstat'>