#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*/ buf;

/* Variables and functions */
int /*<<< orphan*/ O_WRONLY;
int /*<<< orphan*/ close(int);
int open(char *, int /*<<< orphan*/);
int /*<<< orphan*/ perror(char *);
int snprintf(char *, int, char *, unsigned int);
scalar_t__ strlen(char const *);
int /*<<< orphan*/ write(int, char const *, scalar_t__);
int gpio_set_edge(unsigned int pin, const char *edge) {
  int fd, len;
  char buf[64];
  len = snprintf(buf, sizeof(buf),
                 "/gpio"
                 "/pin%d/edge",
                 pin);
  fd = open(buf, O_WRONLY);
  if (fd < 0) {
    perror("gpio/set-edge");
    return fd;
  }
  write(fd, edge, strlen(edge) + 1);
  close(fd);
  return 0;
}


x86 assembly (clang, -O0):
<gpio_set_edge>:
push   %rbp
mov    %rsp,%rbp
sub    $0x70,%rsp
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
lea    -0x60(%rbp),%rdi
mov    -0x8(%rbp),%ecx
mov    $0x40,%esi
lea    0xe7e(%rip),%rdx
call   1050 <snprintf@plt>
mov    %eax,-0x18(%rbp)
lea    -0x60(%rbp),%rdi
mov    0x2e43(%rip),%rax
mov    (%rax),%esi
call   1070 <open@plt>
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jge    11c0 <gpio_set_edge+0x60>
lea    0xe61(%rip),%rdi
call   1080 <perror@plt>
mov    -0x14(%rbp),%eax
mov    %eax,-0x4(%rbp)
jmp    11f9 <gpio_set_edge+0x99>
mov    -0x14(%rbp),%eax
mov    %eax,-0x6c(%rbp)
mov    -0x10(%rbp),%rax
mov    %rax,-0x68(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    -0x6c(%rbp),%edi
mov    -0x68(%rbp),%rsi
mov    %rax,%rdx
add    $0x1,%rdx
call   1030 <write@plt>
mov    -0x14(%rbp),%edi
call   1060 <close@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x70,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gpio_set_edge>:
push   %rbp
push   %rbx
sub    $0x48,%rsp
mov    %rsi,%rbx
mov    %edi,%ecx
lea    0xe8e(%rip),%rdx
mov    %rsp,%rbp
mov    %rbp,%rdi
mov    $0x40,%esi
call   1050 <snprintf@plt>
mov    0x2e4f(%rip),%rax
mov    (%rax),%esi
mov    %rbp,%rdi
call   1070 <open@plt>
mov    %eax,%ebp
test   %eax,%eax
js     11c1 <gpio_set_edge+0x61>
mov    %rbx,%rdi
call   1040 <strlen@plt>
lea    0x1(%rax),%rdx
mov    %ebp,%edi
mov    %rbx,%rsi
call   1030 <write@plt>
mov    %ebp,%edi
call   1060 <close@plt>
xor    %ebp,%ebp
mov    %ebp,%eax
add    $0x48,%rsp
pop    %rbx
pop    %rbp
ret
lea    0xe49(%rip),%rdi
call   1080 <perror@plt>
jmp    11b8 <gpio_set_edge+0x58>

LLVM IR (-O0):
@.str = [17 x i8] c"/gpio/pin%d/edge\00"
@O_WRONLY = global i32 0
@.str.1 = [14 x i8] c"gpio/set-edge\00"
define i32 @gpio_set_edge(i32 %0, i8* %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8*
%6 = alloca i32
%7 = alloca i32
%8 = alloca [64 x i8]
store i32 %0, i32* %4
store i8* %1, i8** %5
%9 = getelementptr inbounds [64 x i8], [64 x i8]* %8, i64 0, i64 0
%10 = load i32, i32* %4
%11 = call i32 @snprintf(i8* %9, i32 64, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32 %10)
store i32 %11, i32* %7
%12 = getelementptr inbounds [64 x i8], [64 x i8]* %8, i64 0, i64 0
%13 = load i32, i32* @O_WRONLY
%14 = call i32 @open(i8* %12, i32 %13)
store i32 %14, i32* %6
%15 = load i32, i32* %6
%16 = icmp slt i32 %15, 0
br i1 %16, label %17, label %20
17: ; preds = %2
%18 = call i32 @perror(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0))
%19 = load i32, i32* %6
store i32 %19, i32* %3
br label %29
20: ; preds = %2
%21 = load i32, i32* %6
%22 = load i8*, i8** %5
%23 = load i8*, i8** %5
%24 = call i64 @strlen(i8* %23)
%25 = add nsw i64 %24, 1
%26 = call i32 @write(i32 %21, i8* %22, i64 %25)
%27 = load i32, i32* %6
%28 = call i32 @close(i32 %27)
store i32 0, i32* %3
br label %29
29: ; preds = %20, %17
%30 = load i32, i32* %3
ret i32 %30
}

LLVM IR (-O2):
@.str = [17 x i8] c"/gpio/pin%d/edge\00"
@O_WRONLY = global i32 0
@.str.1 = [14 x i8] c"gpio/set-edge\00"
define i32 @gpio_set_edge(i32 %0, i8* nocapture %1) {
%3 = alloca [64 x i8]
%4 = getelementptr inbounds [64 x i8], [64 x i8]* %3, i64 0, i64 0
%5 = call i32 @snprintf(i8* %4, i32 64, i8* getelementptr inbounds ([17 x i8], [17 x i8]* @.str, i64 0, i64 0), i32 %0)
%6 = load i32, i32* @O_WRONLY
%7 = call i32 @open(i8* %4, i32 %6)
%8 = icmp slt i32 %7, 0
br i1 %8, label %9, label %11
9: ; preds = %2
%10 = call i32 @perror(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str.1, i64 0, i64 0))
br label %16
11: ; preds = %2
%12 = call i64 @strlen(i8* dereferenceable(1) %1)
%13 = add nsw i64 %12, 1
%14 = call i32 @write(i32 %7, i8* %1, i64 %13)
%15 = call i32 @close(i32 %7)
br label %16
16: ; preds = %11, %9
%17 = phi i32 [ %7, %9 ], [ 0, %11 ]
ret i32 %17
}