#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 */
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, ...);
int /*<<< orphan*/ perror(char *);
int setGateway(char *gw) {
  FILE *net;
  net = fopen("/bin/start_net.sh", "w+");
  if (NULL == net) {
    perror("Error settings Gateway");
    return -1;
  }
  fprintf(net, "#!/bin/sh\n\n");
  fprintf(net, "# set a default gateway:\n");
  fprintf(net, "/bin/ip route add default via %s\n", gw);
  fclose(net);
  return 0;
}


x86 assembly (clang, -O0):
<setGateway>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
lea    0xead(%rip),%rdi
lea    0xeb8(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
xor    %eax,%eax
cmp    -0x18(%rbp),%rax
jne    1187 <setGateway+0x47>
lea    0xe9f(%rip),%rdi
call   1060 <perror@plt>
movl   $0xffffffff,-0x4(%rbp)
jmp    11d1 <setGateway+0x91>
mov    -0x18(%rbp),%rdi
lea    0xe9a(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
mov    -0x18(%rbp),%rdi
lea    0xe94(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
mov    -0x18(%rbp),%rdi
mov    -0x10(%rbp),%rdx
lea    0xe98(%rip),%rsi
mov    $0x0,%al
call   1040 <fprintf@plt>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<setGateway>:
push   %rbp
push   %r14
push   %rbx
mov    %rdi,%r14
lea    0xea2(%rip),%rdi
lea    0xead(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     11c9 <setGateway+0x79>
mov    %rax,%rbx
lea    0xeb3(%rip),%rdi
mov    $0xb,%esi
mov    $0x1,%edx
mov    %rax,%rcx
call   1070 <fwrite@plt>
lea    0xea6(%rip),%rdi
mov    $0x19,%esi
mov    $0x1,%edx
mov    %rbx,%rcx
call   1070 <fwrite@plt>
lea    0xea7(%rip),%rsi
xor    %ebp,%ebp
mov    %rbx,%rdi
mov    %r14,%rdx
xor    %eax,%eax
call   1040 <fprintf@plt>
mov    %rbx,%rdi
call   1030 <fclose@plt>
mov    %ebp,%eax
pop    %rbx
pop    %r14
pop    %rbp
ret
lea    0xe45(%rip),%rdi
call   1060 <perror@plt>
mov    $0xffffffff,%ebp
jmp    11c2 <setGateway+0x72>

LLVM IR (-O0):
@.str = [18 x i8] c"/bin/start_net.sh\00"
@.str.1 = [3 x i8] c"w+\00"
@.str.2 = [23 x i8] c"Error settings Gateway\00"
@.str.3 = [12 x i8] c"#!/bin/sh\0A\0A\00"
@.str.4 = [26 x i8] c"# set a default gateway:\0A\00"
@.str.5 = [34 x i8] c"/bin/ip route add default via %s\0A\00"
define i32 @setGateway(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32*
store i8* %0, i8** %3
%5 = call i32* @fopen(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
store i32* %5, i32** %4
%6 = load i32*, i32** %4
%7 = icmp eq i32* null, %6
br i1 %7, label %8, label %10
8: ; preds = %1
%9 = call i32 @perror(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0))
store i32 -1, i32* %2
br label %20
10: ; preds = %1
%11 = load i32*, i32** %4
%12 = call i32 (i32*, i8*, ...) @fprintf(i32* %11, i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0))
%13 = load i32*, i32** %4
%14 = call i32 (i32*, i8*, ...) @fprintf(i32* %13, i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0))
%15 = load i32*, i32** %4
%16 = load i8*, i8** %3
%17 = call i32 (i32*, i8*, ...) @fprintf(i32* %15, i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.5, i64 0, i64 0), i8* %16)
%18 = load i32*, i32** %4
%19 = call i32 @fclose(i32* %18)
store i32 0, i32* %2
br label %20
20: ; preds = %10, %8
%21 = load i32, i32* %2
ret i32 %21
}

LLVM IR (-O2):
@.str = [18 x i8] c"/bin/start_net.sh\00"
@.str.1 = [3 x i8] c"w+\00"
@.str.2 = [23 x i8] c"Error settings Gateway\00"
@.str.3 = [12 x i8] c"#!/bin/sh\0A\0A\00"
@.str.4 = [26 x i8] c"# set a default gateway:\0A\00"
@.str.5 = [34 x i8] c"/bin/ip route add default via %s\0A\00"
define i32 @setGateway(i8* %0) {
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([18 x i8], [18 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %6
4: ; preds = %1
%5 = tail call i32 @perror(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str.2, i64 0, i64 0))
br label %11
6: ; preds = %1
%7 = tail call i64 @fwrite(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str.3, i64 0, i64 0), i64 11, i64 1, i32* %2)
%8 = tail call i64 @fwrite(i8* getelementptr inbounds ([26 x i8], [26 x i8]* @.str.4, i64 0, i64 0), i64 25, i64 1, i32* %2)
%9 = tail call i32 (i32*, i8*, ...) @fprintf(i32* %2, i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str.5, i64 0, i64 0), i8* %0)
%10 = tail call i32 @fclose(i32* %2)
br label %11
11: ; preds = %6, %4
%12 = phi i32 [ -1, %4 ], [ 0, %6 ]
ret i32 %12
}