#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 */
char *malloc(size_t);
int /*<<< orphan*/ memcpy(char *, char const *, size_t);
size_t strlen(char const *);
char *clicon_strndup(const char *str, size_t len) {
  char *new;
  size_t slen;
  slen = strlen(str);
  len = (len < slen ? len : slen);
  new = malloc(len + 1);
  if (new == NULL)
    return NULL;
  new[len] = '\0';
  memcpy(new, str, len);
  return new;
}


x86 assembly (clang, -O0):
<clicon_strndup>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    %rdi,-0x10(%rbp)
mov    %rsi,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1030 <strlen@plt>
mov    %rax,-0x28(%rbp)
mov    -0x18(%rbp),%rax
cmp    -0x28(%rbp),%rax
jae    1168 <clicon_strndup+0x38>
mov    -0x18(%rbp),%rax
mov    %rax,-0x30(%rbp)
jmp    1170 <clicon_strndup+0x40>
mov    -0x28(%rbp),%rax
mov    %rax,-0x30(%rbp)
mov    -0x30(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x18(%rbp),%rdi
add    $0x1,%rdi
call   1050 <malloc@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x20(%rbp)
jne    11a1 <clicon_strndup+0x71>
movq   $0x0,-0x8(%rbp)
jmp    11c6 <clicon_strndup+0x96>
mov    -0x20(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x20(%rbp),%rdi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
call   1040 <memcpy@plt>
mov    -0x20(%rbp),%rax
mov    %rax,-0x8(%rbp)
mov    -0x8(%rbp),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<clicon_strndup>:
push   %r15
push   %r14
push   %rbx
mov    %rsi,%r15
mov    %rdi,%r14
call   1030 <strlen@plt>
mov    %rax,%rbx
cmp    %r15,%rax
cmova  %r15,%rbx
lea    0x1(%rbx),%rdi
call   1050 <malloc@plt>
mov    %rax,%r15
test   %rax,%rax
je     116e <clicon_strndup+0x3e>
movb   $0x0,(%r15,%rbx,1)
mov    %r15,%rdi
mov    %r14,%rsi
mov    %rbx,%rdx
call   1040 <memcpy@plt>
mov    %r15,%rax
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i8* @clicon_strndup(i8* %0, i64 %1) {
%3 = alloca i8*
%4 = alloca i8*
%5 = alloca i64
%6 = alloca i8*
%7 = alloca i64
store i8* %0, i8** %4
store i64 %1, i64* %5
%8 = load i8*, i8** %4
%9 = call i64 @strlen(i8* %8)
store i64 %9, i64* %7
%10 = load i64, i64* %5
%11 = load i64, i64* %7
%12 = icmp ult i64 %10, %11
br i1 %12, label %13, label %15
13: ; preds = %2
%14 = load i64, i64* %5
br label %17
15: ; preds = %2
%16 = load i64, i64* %7
br label %17
17: ; preds = %15, %13
%18 = phi i64 [ %14, %13 ], [ %16, %15 ]
store i64 %18, i64* %5
%19 = load i64, i64* %5
%20 = add i64 %19, 1
%21 = call i8* @malloc(i64 %20)
store i8* %21, i8** %6
%22 = load i8*, i8** %6
%23 = icmp eq i8* %22, null
br i1 %23, label %24, label %25
24: ; preds = %17
store i8* null, i8** %3
br label %34
25: ; preds = %17
%26 = load i8*, i8** %6
%27 = load i64, i64* %5
%28 = getelementptr inbounds i8, i8* %26, i64 %27
store i8 0, i8* %28
%29 = load i8*, i8** %6
%30 = load i8*, i8** %4
%31 = load i64, i64* %5
%32 = call i32 @memcpy(i8* %29, i8* %30, i64 %31)
%33 = load i8*, i8** %6
store i8* %33, i8** %3
br label %34
34: ; preds = %25, %24
%35 = load i8*, i8** %3
ret i8* %35
}

LLVM IR (-O2):
define i8* @clicon_strndup(i8* %0, i64 %1) {
%3 = tail call i64 @strlen(i8* dereferenceable(1) %0)
%4 = icmp ugt i64 %3, %1
%5 = select i1 %4, i64 %1, i64 %3
%6 = add i64 %5, 1
%7 = tail call i8* @malloc(i64 %6)
%8 = icmp eq i8* %7, null
br i1 %8, label %12, label %9
9: ; preds = %2
%10 = getelementptr inbounds i8, i8* %7, i64 %5
store i8 0, i8* %10
%11 = tail call i32 @memcpy(i8* %7, i8* %0, i64 %5)
br label %12
12: ; preds = %2, %9
ret i8* %7
}