user: Please show me the C implementation that matches the assembly code listed below:

```asm
<main>:
  endbr64
  push   %r15
  lea    D69(%rip),%rdx
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %edi,%ebx
  sub    $0x678,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x668(%rsp)
  xor    %eax,%eax
  call   <has_arg@plt>
  test   %rax,%rax
  jne    L86
  lea    D74(%rip),%rdx
  mov    %rbp,%rsi
  mov    %ebx,%edi
  call   <has_arg@plt>
  test   %rax,%rax
  je     L149
L86:
  lea    D28(%rip),%rdi
  call   <puts@plt>
  lea    D61(%rip),%rdi
  call   <puts@plt>
  lea    D23(%rip),%rdi
  call   <puts@plt>
  mov    $0x1,%eax
L19:
  mov    0x668(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L169
  add    $0x678,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L149:
  mov    %rbp,%rsi
  mov    %ebx,%edi
  call   <bu_handle_version@plt>
  test   %rax,%rax
  jne    L180
  cmp    $0x1,%ebx
  jle    L115
  lea    -0x2(%rbx),%eax
  lea    0x8(%rbp),%r15
  xor    %r14d,%r14d
  xor    %r13d,%r13d
  movq   $0x0,0x8(%rsp)
  lea    0x10(%rbp,%rax,8),%r12
  lea    D8(%rip),%rbx
  movq   $0x0,(%rsp)
  jmp    L73
  xchg   %ax,%ax
L136:
  mov    (%r15),%rax
  cmpb   $0x2b,(%rax)
  je     L174
  mov    %rax,0x8(%rsp)
  mov    $0x1,%r14d
L48:
  add    $0x8,%r15
  cmp    %r12,%r15
  je     L1
L73:
  mov    (%r15),%rdi
  mov    %rbx,%rsi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L136
  add    $0x8,%r15
  mov    $0x1,%r13d
  cmp    %r12,%r15
  jne    L73
L1:
  test   %r14d,%r14d
  jne    L16
  cmpq   $0x0,(%rsp)
  je     L122
L106:
  xor    %edi,%edi
  call   <time@plt>
  mov    %eax,0x1c(%rsp)
  test   %r13d,%r13d
  je     L41
  lea    0x1c(%rsp),%rdi
  call   <gmtime@plt>
  mov    %rax,%rcx
L18:
  test   %rcx,%rcx
  je     L31
  lea    0x20(%rsp),%rbp
  mov    (%rsp),%rdx
  mov    $0x640,%esi
  mov    %rbp,%rdi
  call   <strftime@plt>
  test   %rax,%rax
  jne    L49
L180:
  xor    %eax,%eax
  jmp    L19
L174:
  add    $0x1,%rax
  mov    %rax,(%rsp)
  jmp    L48
L115:
  xor    %edi,%edi
  call   <time@plt>
  mov    %eax,0x1c(%rsp)
  lea    D72(%rip),%rax
  mov    %rax,(%rsp)
L41:
  lea    0x1c(%rsp),%rdi
  call   <localtime@plt>
  mov    %rax,%rcx
  jmp    L18
L49:
  mov    %rbp,%rdi
  call   <puts@plt>
  xor    %eax,%eax
  jmp    L19
L16:
  mov    0x668(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L169
  mov    0x8(%rsp),%rdi
  add    $0x678,%rsp
  mov    %rbp,%rsi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1150 <set_time@plt>
L31:
  mov    0x0(%rbp),%rdi
  call   <perror@plt>
  mov    $0x1,%eax
  jmp    L19
L122:
  lea    D72(%rip),%rax
  mov    %rax,(%rsp)
  jmp    L106
L169:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_tag: D69
data_type: string
name: read_data
arguments: data_tag: D74
data_type: string
name: read_data
arguments: data_tag: D28
data_type: string
name: read_data
arguments: data_tag: D61
data_type: string
name: read_data
arguments: data_tag: D23
data_type: string
name: read_data
arguments: data_tag: D8
data_type: string
name: read_data
arguments: data_tag: D72
data_type: string

tool: D69: -h

tool: D74: --help

tool: D28: Usage: date [-u] [+FORMAT]

tool: D61:        date [-u] MMDDhhmm[[CC]YY

tool: D23: Print the current time in the specified FORMAT, or set the date.

tool: D8: -u

tool: D72: %a %b %e %H:%M:%S %Z %Y

assistant: ```c
int main(int argc, char **argv) {
  if (has_arg(argc, argv, "-h") || has_arg(argc, argv, "--help")) {
    puts("Usage: date [-u] [+FORMAT]");
    puts("       date [-u] MMDDhhmm[[CC]YY");
    puts("Print the current time in the specified FORMAT, or set the date.");
    return 1;
  }
  if (bu_handle_version(argc, argv)) {
    return 0;
  }
  char *format_str = NULL;
  char *date_str = NULL;
  int dash_u = 0;
  int should_set_time = 0;
  for (int i = 1; i < argc; i++) {
    if (strcmp(argv[i], "-u") == 0) {
      dash_u = 1;
    } else if (argv[i][0] == '+') {
      format_str = argv[i];
      format_str++;
    } else {
      should_set_time = 1;
      date_str = argv[i];
    }
  }
  if (should_set_time) {
    return set_time(date_str, argv);
  }
  if (format_str == NULL) {
    format_str = "%a %b %e %H:%M:%S %Z %Y";
  }
  char *buf[200];
  time_t t;
  struct tm *current_time;
  t = time(NULL);
  if (dash_u) {
    current_time = gmtime(&t);
  } else {
    current_time = localtime(&t);
  }
  if (current_time == NULL) {
    perror(argv[0]);
    return 1;
  }
  if (strftime((char *)buf, sizeof(buf), format_str, current_time)) {
    puts((char *)buf);
  }
  return 0;
}
```