#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ printf(char *);
void usage() {
  printf("usage: knock [options] <host> <port[:proto]> [port[:proto]] ...\n");
  printf("options:\n");
  printf(
      "  -u, --udp            make all ports hits use UDP (default is TCP)\n");
  printf("  -d, --delay <t>      wait <t> milliseconds between port hits\n");
  printf("  -4, --ipv4           Force usage of IPv4\n");
  printf("  -6, --ipv6           Force usage of IPv6\n");
  printf("  -v, --verbose        be verbose\n");
  printf("  -V, --version        display version\n");
  printf("  -h, --help           this help\n");
  printf("\n");
  printf("example:  knock myserver.example.com 123:tcp 456:udp 789:tcp\n");
  printf("\n");
  exit(1);
}


x86 assembly (clang, -O0):
<usage>:
push   %rbp
mov    %rsp,%rbp
lea    0xed5(%rip),%rdi
call   1030 <printf@plt>
lea    0xf0a(%rip),%rdi
call   1030 <printf@plt>
lea    0xf08(%rip),%rdi
call   1030 <printf@plt>
lea    0xf41(%rip),%rdi
call   1030 <printf@plt>
lea    0xf75(%rip),%rdi
call   1030 <printf@plt>
lea    0xf95(%rip),%rdi
call   1030 <printf@plt>
lea    0xfb5(%rip),%rdi
call   1030 <printf@plt>
lea    0xfcc(%rip),%rdi
call   1030 <printf@plt>
lea    0xfe8(%rip),%rdi
call   1030 <printf@plt>
lea    0xef7(%rip),%rdi
call   1030 <printf@plt>
lea    0xff2(%rip),%rdi
call   1030 <printf@plt>
lea    0xedf(%rip),%rdi
call   1030 <printf@plt>
mov    $0x1,%edi
call   1040 <exit@plt>

x86 assembly (clang, -O2):
<usage>:
push   %rax
lea    0xec8(%rip),%rdi
call   1040 <puts@plt>
lea    0xefc(%rip),%rdi
call   1040 <puts@plt>
lea    0xef9(%rip),%rdi
call   1040 <puts@plt>
lea    0xf31(%rip),%rdi
call   1040 <puts@plt>
lea    0xf64(%rip),%rdi
call   1040 <puts@plt>
lea    0xf83(%rip),%rdi
call   1040 <puts@plt>
lea    0xfa2(%rip),%rdi
call   1040 <puts@plt>
lea    0xfb8(%rip),%rdi
call   1040 <puts@plt>
lea    0xfd3(%rip),%rdi
call   1040 <puts@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    0xfde(%rip),%rdi
call   1040 <puts@plt>
mov    $0xa,%edi
call   1030 <putchar@plt>
mov    $0x1,%edi
call   1050 <exit@plt>

LLVM IR (-O0):
@.str = [65 x i8] c"usage: knock [options] <host> <port[:proto]> [port[:proto]] ...\0A\00"
@.str.1 = [10 x i8] c"options:\0A\00"
@.str.2 = [69 x i8] c" -u, --udp make all ports hits use UDP (default is TCP)\0A\00"
@.str.3 = [64 x i8] c" -d, --delay <t> wait <t> milliseconds between port hits\0A\00"
@.str.4 = [44 x i8] c" -4, --ipv4 Force usage of IPv4\0A\00"
@.str.5 = [44 x i8] c" -6, --ipv6 Force usage of IPv6\0A\00"
@.str.6 = [35 x i8] c" -v, --verbose be verbose\0A\00"
@.str.7 = [40 x i8] c" -V, --version display version\0A\00"
@.str.8 = [34 x i8] c" -h, --help this help\0A\00"
@.str.9 = [2 x i8] c"\0A\00"
@.str.10 = [62 x i8] c"example: knock myserver.example.com 123:tcp 456:udp 789:tcp\0A\00"
define void @usage() {
%1 = call i32 @printf(i8* getelementptr inbounds ([65 x i8], [65 x i8]* @.str, i64 0, i64 0))
%2 = call i32 @printf(i8* getelementptr inbounds ([10 x i8], [10 x i8]* @.str.1, i64 0, i64 0))
%3 = call i32 @printf(i8* getelementptr inbounds ([69 x i8], [69 x i8]* @.str.2, i64 0, i64 0))
%4 = call i32 @printf(i8* getelementptr inbounds ([64 x i8], [64 x i8]* @.str.3, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([44 x i8], [44 x i8]* @.str.4, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([44 x i8], [44 x i8]* @.str.5, i64 0, i64 0))
%7 = call i32 @printf(i8* getelementptr inbounds ([35 x i8], [35 x i8]* @.str.6, i64 0, i64 0))
%8 = call i32 @printf(i8* getelementptr inbounds ([40 x i8], [40 x i8]* @.str.7, i64 0, i64 0))
%9 = call i32 @printf(i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.8, i64 0, i64 0))
%10 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0))
%11 = call i32 @printf(i8* getelementptr inbounds ([62 x i8], [62 x i8]* @.str.10, i64 0, i64 0))
%12 = call i32 @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.9, i64 0, i64 0))
%13 = call i32 @exit(i32 1)
unreachable
}

LLVM IR (-O2):
@str = [64 x i8] c"usage: knock [options] <host> <port[:proto]> [port[:proto]] ...\00"
@str.11 = [9 x i8] c"options:\00"
@str.12 = [68 x i8] c" -u, --udp make all ports hits use UDP (default is TCP)\00"
@str.13 = [63 x i8] c" -d, --delay <t> wait <t> milliseconds between port hits\00"
@str.14 = [43 x i8] c" -4, --ipv4 Force usage of IPv4\00"
@str.15 = [43 x i8] c" -6, --ipv6 Force usage of IPv6\00"
@str.16 = [34 x i8] c" -v, --verbose be verbose\00"
@str.17 = [39 x i8] c" -V, --version display version\00"
@str.18 = [33 x i8] c" -h, --help this help\00"
@str.19 = [61 x i8] c"example: knock myserver.example.com 123:tcp 456:udp 789:tcp\00"
define void @usage() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([64 x i8], [64 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([9 x i8], [9 x i8]* @str.11, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([68 x i8], [68 x i8]* @str.12, i64 0, i64 0))
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([63 x i8], [63 x i8]* @str.13, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([43 x i8], [43 x i8]* @str.14, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([43 x i8], [43 x i8]* @str.15, i64 0, i64 0))
%7 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @str.16, i64 0, i64 0))
%8 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([39 x i8], [39 x i8]* @str.17, i64 0, i64 0))
%9 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([33 x i8], [33 x i8]* @str.18, i64 0, i64 0))
%10 = tail call i32 @putchar(i32 10)
%11 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([61 x i8], [61 x i8]* @str.19, i64 0, i64 0))
%12 = tail call i32 @putchar(i32 10)
%13 = tail call i32 @exit(i32 1)
unreachable
}