#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 */
size_t strlen(char const *);
int /*<<< orphan*/ strncpy(char *, char const *, size_t);
size_t strlcpy(char *dest, const char *src, size_t size) {
  size_t len;
  len = strlen(src);
  if (size) {
    if (len >= size)
      size -= 1;
    else
      size = len;
    strncpy(dest, src, size);
    dest[size] = '\0';
  }
  return size;
}


x86 assembly (clang, -O0):
<strlcpy>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    %rdx,-0x18(%rbp)
mov    -0x10(%rbp),%rdi
call   1040 <strlen@plt>
mov    %rax,-0x20(%rbp)
cmpq   $0x0,-0x18(%rbp)
je     1190 <strlcpy+0x70>
mov    -0x20(%rbp),%rax
cmp    -0x18(%rbp),%rax
jb     116b <strlcpy+0x4b>
mov    -0x18(%rbp),%rax
sub    $0x1,%rax
mov    %rax,-0x18(%rbp)
jmp    1173 <strlcpy+0x53>
mov    -0x20(%rbp),%rax
mov    %rax,-0x18(%rbp)
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rsi
mov    -0x18(%rbp),%rdx
call   1030 <strncpy@plt>
mov    -0x8(%rbp),%rax
mov    -0x18(%rbp),%rcx
movb   $0x0,(%rax,%rcx,1)
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<strlcpy>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
mov    %rdx,%r12
mov    %rsi,%r15
mov    %rdi,%r14
mov    %rsi,%rdi
call   1040 <strlen@plt>
test   %r12,%r12
je     115f <strlcpy+0x3f>
lea    -0x1(%r12),%rbx
cmp    %r12,%rax
cmovb  %rax,%rbx
mov    %r14,%rdi
mov    %r15,%rsi
mov    %rbx,%rdx
call   1030 <strncpy@plt>
movb   $0x0,(%r14,%rbx,1)
jmp    1161 <strlcpy+0x41>
xor    %ebx,%ebx
mov    %rbx,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
define i64 @strlcpy(i8* %0, i8* %1, i64 %2) {
%4 = alloca i8*
%5 = alloca i8*
%6 = alloca i64
%7 = alloca i64
store i8* %0, i8** %4
store i8* %1, i8** %5
store i64 %2, i64* %6
%8 = load i8*, i8** %5
%9 = call i64 @strlen(i8* %8)
store i64 %9, i64* %7
%10 = load i64, i64* %6
%11 = icmp ne i64 %10, 0
br i1 %11, label %12, label %29
12: ; preds = %3
%13 = load i64, i64* %7
%14 = load i64, i64* %6
%15 = icmp uge i64 %13, %14
br i1 %15, label %16, label %19
16: ; preds = %12
%17 = load i64, i64* %6
%18 = sub i64 %17, 1
store i64 %18, i64* %6
br label %21
19: ; preds = %12
%20 = load i64, i64* %7
store i64 %20, i64* %6
br label %21
21: ; preds = %19, %16
%22 = load i8*, i8** %4
%23 = load i8*, i8** %5
%24 = load i64, i64* %6
%25 = call i32 @strncpy(i8* %22, i8* %23, i64 %24)
%26 = load i8*, i8** %4
%27 = load i64, i64* %6
%28 = getelementptr inbounds i8, i8* %26, i64 %27
store i8 0, i8* %28
br label %29
29: ; preds = %21, %3
%30 = load i64, i64* %6
ret i64 %30
}

LLVM IR (-O2):
define i64 @strlcpy(i8* %0, i8* %1, i64 %2) {
%4 = tail call i64 @strlen(i8* dereferenceable(1) %1)
%5 = icmp eq i64 %2, 0
br i1 %5, label %12, label %6
6: ; preds = %3
%7 = icmp ult i64 %4, %2
%8 = add i64 %2, -1
%9 = select i1 %7, i64 %4, i64 %8
%10 = tail call i32 @strncpy(i8* %0, i8* %1, i64 %9)
%11 = getelementptr inbounds i8, i8* %0, i64 %9
store i8 0, i8* %11
br label %12
12: ; preds = %6, %3
%13 = phi i64 [ %9, %6 ], [ 0, %3 ]
ret i64 %13
}