#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*/ time_t;
struct tm {
  int dummy;
};

/* Variables and functions */
struct tm *localtime(int /*<<< orphan*/ *);
int /*<<< orphan*/ sprintf(char *, char *, char *);
int /*<<< orphan*/ strftime(char *, int, char *, struct tm *);
int /*<<< orphan*/ time(int /*<<< orphan*/ *);
void get_timestamp(char *timestamp) {
  time_t time_ptr;
  struct tm *time_struct;
  char buffer[30];
  time(&time_ptr);
  time_struct = localtime(&time_ptr);
  strftime(buffer, 30, "%Y-%m-%dT%I:%M:%S+00:00", time_struct);
  sprintf(timestamp, "%.30s", buffer);
}


x86 assembly (clang, -O0):
<get_timestamp>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x8(%rbp)
lea    -0xc(%rbp),%rdi
call   1040 <time@plt>
lea    -0xc(%rbp),%rdi
call   1030 <localtime@plt>
mov    %rax,-0x18(%rbp)
lea    -0x40(%rbp),%rdi
mov    -0x18(%rbp),%rcx
mov    $0x1e,%esi
lea    0xe8a(%rip),%rdx
call   1050 <strftime@plt>
mov    -0x8(%rbp),%rdi
lea    -0x40(%rbp),%rdx
lea    0xe8e(%rip),%rsi
call   1060 <sprintf@plt>
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_timestamp>:
push   %r14
push   %rbx
sub    $0x38,%rsp
mov    %rdi,%r14
lea    0xc(%rsp),%rbx
mov    %rbx,%rdi
call   1040 <time@plt>
mov    %rbx,%rdi
call   1030 <localtime@plt>
lea    0xe9a(%rip),%rdx
lea    0x10(%rsp),%rbx
mov    %rbx,%rdi
mov    $0x1e,%esi
mov    %rax,%rcx
call   1050 <strftime@plt>
lea    0xe96(%rip),%rsi
mov    %r14,%rdi
mov    %rbx,%rdx
call   1060 <sprintf@plt>
add    $0x38,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.tm = type { i32 }
@.str = [24 x i8] c"%Y-%m-%dT%I:%M:%S+00:00\00"
@.str.1 = [6 x i8] c"%.30s\00"
define void @get_timestamp(i8* %0) {
%2 = alloca i8*
%3 = alloca i32
%4 = alloca %struct.tm*
%5 = alloca [30 x i8]
store i8* %0, i8** %2
%6 = call i32 @time(i32* %3)
%7 = call %struct.tm* @localtime(i32* %3)
store %struct.tm* %7, %struct.tm** %4
%8 = getelementptr inbounds [30 x i8], [30 x i8]* %5, i64 0, i64 0
%9 = load %struct.tm*, %struct.tm** %4
%10 = call i32 @strftime(i8* %8, i32 30, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), %struct.tm* %9)
%11 = load i8*, i8** %2
%12 = getelementptr inbounds [30 x i8], [30 x i8]* %5, i64 0, i64 0
%13 = call i32 @sprintf(i8* %11, i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8* %12)
ret void
}

LLVM IR (-O2):
%struct.tm = type { i32 }
@.str = [24 x i8] c"%Y-%m-%dT%I:%M:%S+00:00\00"
@.str.1 = [6 x i8] c"%.30s\00"
define void @get_timestamp(i8* nocapture writeonly %0) {
%2 = alloca i32
%3 = alloca [30 x i8]
%4 = bitcast i32* %2 to i8*
%5 = getelementptr inbounds [30 x i8], [30 x i8]* %3, i64 0, i64 0
%6 = call i32 @time(i32* %2)
%7 = call %struct.tm* @localtime(i32* %2)
%8 = call i32 @strftime(i8* %5, i32 30, i8* getelementptr inbounds ([24 x i8], [24 x i8]* @.str, i64 0, i64 0), %struct.tm* %7)
%9 = call i32 @sprintf(i8* dereferenceable(1) %0, i8* dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i8* %5)
ret void
}