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

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ fread(unsigned char *, int, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ fwrite(unsigned char *, int, int, int /*<<< orphan*/ *);
int main(void) {
  FILE *camera;
  FILE *grab;
  camera = fopen("/dev/video0", "rb");
  grab = fopen("grab.png", "wb");
  unsigned char data[307200];
  fread(data, sizeof(data[0]), 307200, camera);
  fwrite(data, sizeof(data[0]), 307200, grab);
  fclose(camera);
  fclose(grab);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x4b020,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xea7(%rip),%rdi
lea    0xeac(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x10(%rbp)
lea    0xe9f(%rip),%rdi
lea    0xea1(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
lea    -0x4b020(%rbp),%rdi
mov    -0x10(%rbp),%rcx
mov    $0x1,%esi
mov    $0x4b000,%edx
call   1030 <fread@plt>
lea    -0x4b020(%rbp),%rdi
mov    -0x18(%rbp),%rcx
mov    $0x1,%esi
mov    $0x4b000,%edx
call   1060 <fwrite@plt>
mov    -0x10(%rbp),%rdi
call   1040 <fclose@plt>
mov    -0x18(%rbp),%rdi
call   1040 <fclose@plt>
xor    %eax,%eax
add    $0x4b020,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x4b000,%rsp
lea    0xead(%rip),%rdi
lea    0xeb2(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%r14
lea    0xea6(%rip),%rdi
lea    0xea8(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,%rbx
mov    %rsp,%r15
mov    %r15,%rdi
mov    $0x1,%esi
mov    $0x4b000,%edx
mov    %r14,%rcx
call   1030 <fread@plt>
mov    %r15,%rdi
mov    $0x1,%esi
mov    $0x4b000,%edx
mov    %rbx,%rcx
call   1060 <fwrite@plt>
mov    %r14,%rdi
call   1040 <fclose@plt>
mov    %rbx,%rdi
call   1040 <fclose@plt>
xor    %eax,%eax
add    $0x4b000,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [12 x i8] c"/dev/video0\00"
@.str.1 = [3 x i8] c"rb\00"
@.str.2 = [9 x i8] c"grab.png\00"
@.str.3 = [3 x i8] c"wb\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca i32*
%4 = alloca [307200 x i8]
store i32 0, i32* %1
%5 = call i32* @fopen(i8* getelementptr inbounds ([12 x i8], [12 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** %2
%6 = call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0))
store i32* %6, i32** %3
%7 = getelementptr inbounds [307200 x i8], [307200 x i8]* %4, i64 0, i64 0
%8 = load i32*, i32** %2
%9 = call i32 @fread(i8* %7, i32 1, i32 307200, i32* %8)
%10 = getelementptr inbounds [307200 x i8], [307200 x i8]* %4, i64 0, i64 0
%11 = load i32*, i32** %3
%12 = call i32 @fwrite(i8* %10, i32 1, i32 307200, i32* %11)
%13 = load i32*, i32** %2
%14 = call i32 @fclose(i32* %13)
%15 = load i32*, i32** %3
%16 = call i32 @fclose(i32* %15)
ret i32 0
}

LLVM IR (-O2):
@.str = [12 x i8] c"/dev/video0\00"
@.str.1 = [3 x i8] c"rb\00"
@.str.2 = [9 x i8] c"grab.png\00"
@.str.3 = [3 x i8] c"wb\00"
define i32 @main() {
%1 = alloca [307200 x i8]
%2 = tail call i32* @fopen(i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0))
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.2, i64 0, i64 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.3, i64 0, i64 0))
%4 = getelementptr inbounds [307200 x i8], [307200 x i8]* %1, i64 0, i64 0
%5 = call i32 @fread(i8* %4, i32 1, i32 307200, i32* %2)
%6 = call i32 @fwrite(i8* %4, i32 1, i32 307200, i32* %3)
%7 = tail call i32 @fclose(i32* %2)
%8 = tail call i32 @fclose(i32* %3)
ret i32 0
}