user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<storesetting>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x818,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x808(%rsp)
  xor    %eax,%eax
  test   %rdi,%rdi
  je     L22
  mov    %rdi,%r13
  mov    %rsp,%rbx
  lea    D26(%rip),%rdi
  mov    %rsi,%r14
  call   <getenv@plt>
  lea    0x400(%rsp),%rbp
  lea    D33(%rip),%rsi
  mov    %rbx,%rdi
  mov    %rax,%r12
  mov    %rax,%rdx
  call   <sprintf@plt>
  mov    %r12,%rdx
  lea    D58(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  mov    %rbx,%rsi
  mov    %rbp,%rdi
  call   <rename@plt>
  lea    D21(%rip),%rsi
  mov    %rbx,%rdi
  call   <fopen@plt>
  mov    %rax,%r12
  test   %rax,%rax
  je     L22
  lea    D74(%rip),%rsi
  mov    %rbp,%rdi
  call   <fopen@plt>
  mov    %rax,%r15
  test   %rax,%rax
  je     L17
  mov    %r13,%rdx
  lea    D55(%rip),%rsi
  mov    %rbp,%rdi
  call   <sprintf@plt>
  jmp    L70
  nopw   0x0(%rax,%rax,1)
L81:
  mov    %rbp,%rdi
  call   <strlen@plt>
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  mov    %eax,%edx
  call   <strncmp@plt>
  test   %rax,%rax
  jne    L32
L70:
  mov    %r12,%rdx
  mov    $0x400,%esi
  mov    %rbx,%rdi
  call   <fgets@plt>
  test   %rax,%rax
  jne    L81
  test   %r14,%r14
  je     L66
  mov    %r14,%rcx
  mov    %r13,%rdx
  lea    D42(%rip),%rsi
  mov    %r15,%rdi
  call   <fprintf@plt>
L66:
  mov    %r12,%rdi
  call   <fclose@plt>
  mov    %r15,%rdi
  call   <fclose@plt>
L22:
  mov    0x808(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L28
  add    $0x818,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  xchg   %ax,%ax
L32:
  mov    %rbx,%rdi
  call   <strlen@plt>
  cmp    $0x2,%eax
  jle    L70
  mov    %rbx,%rdx
  lea    D22(%rip),%rsi
  mov    %r15,%rdi
  xor    %eax,%eax
  call   <fprintf@plt>
  jmp    L70
  cs nopw 0x0(%rax,%rax,1)
L17:
  xor    %edi,%edi
  call   <fclose@plt>
  jmp    L22
L28:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: tag: D26
datatype: string
name: unpack_data
arguments: tag: D33
datatype: string
name: unpack_data
arguments: tag: D58
datatype: string
name: unpack_data
arguments: tag: D21
datatype: string
name: unpack_data
arguments: tag: D74
datatype: string
name: unpack_data
arguments: tag: D55
datatype: string
name: unpack_data
arguments: tag: D42
datatype: string
name: unpack_data
arguments: tag: D22
datatype: string

tool: D26: HOME

tool: D33: %s/.libufs.bak

tool: D58: %s/.libufs

tool: D21: r

tool: D74: w

tool: D55: %s=

tool: D42: %s=%s


tool: D22: %s

assistant: ```c
void storesetting(char *setting, char *value) {
  FILE *f1;
  FILE *f2;
  char *home;
  char temp1[1024];
  char temp2[1024];
  if (!setting) {
    return;
  }
  home = getenv("HOME");
  sprintf(temp1, "%s/.libufs.bak", home);
  sprintf(temp2, "%s/.libufs", home);
  rename(temp2, temp1);
  f1 = fopen(temp1, "r");
  if (!f1) {
    return;
  }
  f2 = fopen(temp2, "w");
  if (!f2) {
    fclose(f2);
    return;
  }
  sprintf(temp2, "%s=", setting);
  while (fgets(temp1, 1024, f1)) {
    if (strncmp(temp1, temp2, strlen(temp2)) != 0) {
      if (strlen(temp1) > 2) {
        fprintf(f2, "%s", temp1);
      }
    }
  }
  if (value) {
    fprintf(f2, "%s=%s\n", setting, value);
  }
  fclose(f1);
  fclose(f2);
}
```