#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 /*<<< orphan*/);
int /*<<< orphan*/ printf(char *);
void usage(void) {
  printf("Usage: ./printenv [OPTION]... [VARIABLE]...\n");
  printf("Print the values of the specified environment VARIABLE(s).\n");
  printf("If no VARIABLE is specified, print name and value pairs for them "
         "all.\n\n");
  printf("  -0, --null     end each output line with 0 byte rather than "
         "newline\n");
  printf("      --help     show this message \n");
  printf("      --version  print information about version\n\n");
  exit(0);
}


x86 assembly (clang, -O0):
<usage>:
push   %rbp
mov    %rsp,%rbp
lea    0xed5(%rip),%rdi
call   1030 <printf@plt>
lea    0xef6(%rip),%rdi
call   1030 <printf@plt>
lea    0xf26(%rip),%rdi
call   1030 <printf@plt>
lea    0xf62(%rip),%rdi
call   1030 <printf@plt>
lea    0xf9d(%rip),%rdi
call   1030 <printf@plt>
lea    0xfb6(%rip),%rdi
call   1030 <printf@plt>
xor    %edi,%edi
call   1040 <exit@plt>

x86 assembly (clang, -O2):
<usage>:
push   %rax
lea    0xed8(%rip),%rdi
call   1030 <puts@plt>
lea    0xef8(%rip),%rdi
call   1030 <puts@plt>
lea    0xf27(%rip),%rdi
call   1030 <puts@plt>
lea    0xf62(%rip),%rdi
call   1030 <puts@plt>
lea    0xf9c(%rip),%rdi
call   1030 <puts@plt>
lea    0xfb4(%rip),%rdi
call   1030 <puts@plt>
xor    %edi,%edi
call   1040 <exit@plt>

LLVM IR (-O0):
@.str = [45 x i8] c"Usage: ./printenv [OPTION]... [VARIABLE]...\0A\00"
@.str.1 = [60 x i8] c"Print the values of the specified environment VARIABLE(s).\0A\00"
@.str.2 = [72 x i8] c"If no VARIABLE is specified, print name and value pairs for them all.\0A\0A\00"
@.str.3 = [71 x i8] c" -0, --null end each output line with 0 byte rather than newline\0A\00"
@.str.4 = [37 x i8] c" --help show this message \0A\00"
@.str.5 = [51 x i8] c" --version print information about version\0A\0A\00"
define void @usage() {
%1 = call i32 @printf(i8* getelementptr inbounds ([45 x i8], [45 x i8]* @.str, i64 0, i64 0))
%2 = call i32 @printf(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @.str.1, i64 0, i64 0))
%3 = call i32 @printf(i8* getelementptr inbounds ([72 x i8], [72 x i8]* @.str.2, i64 0, i64 0))
%4 = call i32 @printf(i8* getelementptr inbounds ([71 x i8], [71 x i8]* @.str.3, i64 0, i64 0))
%5 = call i32 @printf(i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str.4, i64 0, i64 0))
%6 = call i32 @printf(i8* getelementptr inbounds ([51 x i8], [51 x i8]* @.str.5, i64 0, i64 0))
%7 = call i32 @exit(i32 0)
unreachable
}

LLVM IR (-O2):
@str = [44 x i8] c"Usage: ./printenv [OPTION]... [VARIABLE]...\00"
@str.6 = [59 x i8] c"Print the values of the specified environment VARIABLE(s).\00"
@str.7 = [71 x i8] c"If no VARIABLE is specified, print name and value pairs for them all.\0A\00"
@str.8 = [70 x i8] c" -0, --null end each output line with 0 byte rather than newline\00"
@str.9 = [36 x i8] c" --help show this message \00"
@str.10 = [50 x i8] c" --version print information about version\0A\00"
define void @usage() {
%1 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([44 x i8], [44 x i8]* @str, i64 0, i64 0))
%2 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([59 x i8], [59 x i8]* @str.6, i64 0, i64 0))
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([71 x i8], [71 x i8]* @str.7, i64 0, i64 0))
%4 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([70 x i8], [70 x i8]* @str.8, i64 0, i64 0))
%5 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([36 x i8], [36 x i8]* @str.9, i64 0, i64 0))
%6 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([50 x i8], [50 x i8]* @str.10, i64 0, i64 0))
%7 = tail call i32 @exit(i32 0)
unreachable
}