user: 请将以下的汇编代码转换成C语言代码:

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x338,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x328(%rsp)
  xor    %eax,%eax
  cmp    $0x2,%edi
  je     L115
  mov    (%rsi),%rdi
  call   <basename@plt>
  lea    D21(%rip),%rdi
  mov    %eax,%esi
  call   <err_quit@plt>
L115:
  mov    0x8(%rbx),%rcx
  lea    0x20(%rsp),%r14
  mov    $0x100,%esi
  xor    %eax,%eax
  lea    D20(%rip),%rdx
  mov    %r14,%rdi
  call   <snprintf@plt>
  mov    %r14,%rdi
  call   <opendir@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L35
L90:
  lea    D85(%rip),%rbp
  lea    D0(%rip),%r13
  nopw   0x0(%rax,%rax,1)
L85:
  mov    %rbx,%rdi
  call   <readdir@plt>
  mov    %rax,%r15
  test   %rax,%rax
  je     L5
  mov    (%r15),%rdi
  mov    %rbp,%rsi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L85
  mov    (%r15),%rdi
  mov    %r13,%rsi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L85
  mov    (%r15),%r8
  lea    0x120(%rsp),%r12
  mov    %r14,%rcx
  xor    %eax,%eax
  lea    D5(%rip),%rdx
  mov    $0x100,%esi
  mov    %r12,%rdi
  call   <snprintf@plt>
  lea    0x220(%rsp),%r15
  mov    $0xff,%edx
  mov    %r12,%rdi
  mov    %r15,%rsi
  call   <readlink@plt>
  movslq %eax,%rdx
  cmp    $0xffffffff,%edx
  je     L144
L66:
  movb   $0x0,0x220(%rsp,%rdx,1)
  cmpb   $0x2f,0x220(%rsp)
  je     L85
  mov    $0x3a,%esi
  mov    %r15,%rdi
  call   <strchr@plt>
  test   %rax,%rax
  je     L85
  movb   $0x0,(%rax)
  lea    D82(%rip),%rsi
  mov    %r15,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L85
  lea    0x18(%rsp),%rsi
  mov    %r12,%rdi
  call   <stat@plt>
  test   %rax,%rax
  js     L98
L3:
  mov    0x18(%rsp),%rdi
  call   <sockq@plt>
  jmp    L85
  nopl   0x0(%rax)
L5:
  mov    0x328(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L57
  add    $0x338,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L144:
  lea    D48(%rip),%rdi
  mov    %edx,0xc(%rsp)
  call   <err_sys@plt>
  movslq 0xc(%rsp),%rdx
  jmp    L66
L98:
  lea    D35(%rip),%rdi
  call   <err_sys@plt>
  jmp    L3
L35:
  lea    D81(%rip),%rdi
  call   <err_sys@plt>
  jmp    L90
L57:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: label: D21
data_type: string
name: unpack_data
arguments: label: D20
data_type: string
name: unpack_data
arguments: label: D85
data_type: string
name: unpack_data
arguments: label: D0
data_type: string
name: unpack_data
arguments: label: D5
data_type: string
name: unpack_data
arguments: label: D82
data_type: string
name: unpack_data
arguments: label: D48
data_type: string
name: unpack_data
arguments: label: D35
data_type: string
name: unpack_data
arguments: label: D81
data_type: string

tool: D21: Usage: %s <PID>

tool: D20: /proc/%s/fd

tool: D85: .

tool: D0: ..

tool: D5: %s/%s

tool: D82: socket

tool: D48: readlink

tool: D35: stat error

tool: D81: opendir error

assistant: ```c
int main(int argc, char *argv[]) {
  DIR *dp;
  char *ch, buf[256], filename[256], pathname[256];
  struct dirent *dirp;
  int n;
  unsigned long long ino;
  struct stat statbuf;
  if (argc != 2)
    err_quit("Usage: %s <PID>", basename(argv[0]));
  snprintf(buf, sizeof(buf), "/proc/%s/fd", argv[1]);
  if ((dp = opendir(buf)) == NULL)
    err_sys("opendir error");
  while ((dirp = readdir(dp)) != NULL) {
    if (strcmp(dirp->d_name, ".") == 0 || strcmp(dirp->d_name, "..") == 0)
      continue;
    snprintf(filename, sizeof(filename), "%s/%s", buf, dirp->d_name);
    if ((n = readlink(filename, pathname, sizeof(pathname) - 1)) == -1)
      err_sys("readlink");
    pathname[n] = '\0';
    if (*pathname == '/')
      continue;
    if ((ch = strchr(pathname, ':'))) {
      *ch = '\0';
      if (strcmp(pathname, "socket") == 0) {
        if (stat(filename, &statbuf) < 0)
          err_sys("stat error");
        ino = (unsigned long long)statbuf.st_ino;
        sockq(ino);
      }
    }
  }
  return 0;
}
```