#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*/ fprintf(int /*<<< orphan*/, char *);
char *malloc(size_t const);
int /*<<< orphan*/ stderr;
size_t strlen(char const *);
int /*<<< orphan*/ strncpy(char *, char const *, size_t const);
char *new_arg(const char *src) {
  const size_t len = strlen(src);
  char *arg = malloc(len + 1);
  if (NULL == arg) {
    fprintf(stderr, "ERROR: Out of memory while allocating arg\n");
    return NULL;
  }
  strncpy(arg, src, len + 1);
  return arg;
}


x86 assembly (clang, -O0):
<new_arg>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
add    $0x1,%rdi
call   1060 <malloc@plt>
mov    %rax,-0x20(%rbp)
xor    %eax,%eax
cmp    -0x20(%rbp),%rax
jne    1198 <new_arg+0x58>
mov    0x2e63(%rip),%rax
mov    (%rax),%edi
lea    0xe7a(%rip),%rsi
call   1050 <fprintf@plt>
movq   $0x0,-0x8(%rbp)
jmp    11b5 <new_arg+0x75>
mov    -0x20(%rbp),%rdi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
add    $0x1,%rdx
call   1030 <strncpy@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<new_arg>:
push   %r15
push   %r14
push   %rbx
mov    %rdi,%r14
call   1040 <strlen@plt>
mov    %rax,%rbx
add    $0x1,%rbx
mov    %rbx,%rdi
call   1060 <malloc@plt>
mov    %rax,%r15
test   %rax,%rax
je     1174 <new_arg+0x34>
mov    %r15,%rdi
mov    %r14,%rsi
mov    %rbx,%rdx
call   1030 <strncpy@plt>
jmp    1189 <new_arg+0x49>
mov    0x2e65(%rip),%rax
mov    (%rax),%edi
lea    0xe7c(%rip),%rsi
call   1050 <fprintf@plt>
mov    %r15,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@stderr = global i32 0
@.str = [43 x i8] c"ERROR: Out of memory while allocating arg\0A\00"
define i8* @new_arg(i8* %0) {
%2 = alloca i8*
%3 = alloca i8*
%4 = alloca i64
%5 = alloca i8*
store i8* %0, i8** %3
%6 = load i8*, i8** %3
%7 = call i64 @strlen(i8* %6)
store i64 %7, i64* %4
%8 = load i64, i64* %4
%9 = add i64 %8, 1
%10 = call i8* @malloc(i64 %9)
store i8* %10, i8** %5
%11 = load i8*, i8** %5
%12 = icmp eq i8* null, %11
br i1 %12, label %13, label %16
13: ; preds = %1
%14 = load i32, i32* @stderr
%15 = call i32 @fprintf(i32 %14, i8* getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0))
store i8* null, i8** %2
br label %23
16: ; preds = %1
%17 = load i8*, i8** %5
%18 = load i8*, i8** %3
%19 = load i64, i64* %4
%20 = add i64 %19, 1
%21 = call i32 @strncpy(i8* %17, i8* %18, i64 %20)
%22 = load i8*, i8** %5
store i8* %22, i8** %2
br label %23
23: ; preds = %16, %13
%24 = load i8*, i8** %2
ret i8* %24
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [43 x i8] c"ERROR: Out of memory while allocating arg\0A\00"
define i8* @new_arg(i8* %0) {
%2 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%3 = add i64 %2, 1
%4 = tail call i8* @malloc(i64 %3)
%5 = icmp eq i8* %4, null
br i1 %5, label %6, label %9
6: ; preds = %1
%7 = load i32, i32* @stderr
%8 = tail call i32 @fprintf(i32 %7, i8* getelementptr inbounds ([43 x i8], [43 x i8]* @.str, i64 0, i64 0))
br label %11
9: ; preds = %1
%10 = tail call i32 @strncpy(i8* %4, i8* %0, i64 %3)
br label %11
11: ; preds = %9, %6
ret i8* %4
}