user: Converte this assembly snippet into its equivalent C code:

```asm
<getvalue>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x2f0,%rsp
  mov    %rdi,-0x2d8(%rbp)
  mov    %rsi,-0x2e0(%rbp)
  mov    %rdx,-0x2e8(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  mov    D4(%rip),%rax
  mov    (%rax),%edx
  mov    -0x2d8(%rbp),%rax
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <fseek@plt>
  jmp    L162
L50:
  lea    -0x1d0(%rbp),%rax
  mov    %rax,-0x2c8(%rbp)
  lea    -0x2b0(%rbp),%rax
  mov    %rax,-0x2c0(%rbp)
  mov    -0x2e8(%rbp),%rax
  mov    %rax,-0x2b8(%rbp)
  jmp    L254
L41:
  addq   $0x1,-0x2c8(%rbp)
L254:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L41
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x23,%al
  je     L162
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L252
  jmp    L162
L212:
  lea    -0x2b0(%rbp),%rax
  add    $0xd8,%rax
  cmp    %rax,-0x2c0(%rbp)
  jb     L178
  mov    $0xfffffffd,%eax
  jmp    L267
L178:
  mov    -0x2c8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x2c8(%rbp)
  mov    -0x2c0(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x2c0(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L252:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L154
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x5f,%al
  je     L212
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isalnum@plt>
  test   %rax,%rax
  jne    L212
L154:
  mov    -0x2c0(%rbp),%rax
  movb   $0x0,(%rax)
  jmp    L233
L145:
  addq   $0x1,-0x2c8(%rbp)
L233:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x3d,%al
  je     L85
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L145
L85:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L158
  jmp    L162
L158:
  nop
L67:
  addq   $0x1,-0x2c8(%rbp)
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L67
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L207
  jmp    L162
L207:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  jne    L33
  addq   $0x1,-0x2c8(%rbp)
  jmp    L33
L194:
  mov    -0x2e8(%rbp),%rax
  add    $0xd8,%rax
  cmp    %rax,-0x2b8(%rbp)
  jb     L214
  mov    $0xfffffffd,%eax
  jmp    L267
L214:
  mov    -0x2c8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x2c8(%rbp)
  mov    -0x2b8(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x2b8(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L33:
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  je     L63
  mov    -0x2c8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x22,%al
  jne    L194
L63:
  mov    -0x2b8(%rbp),%rax
  movb   $0x0,(%rax)
  lea    -0x2b0(%rbp),%rdx
  mov    -0x2e0(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %eax,%eax
  jne    L162
  mov    $0x0,%eax
  jmp    L267
L162:
  mov    -0x2d8(%rbp),%rdx
  lea    -0x1d0(%rbp),%rax
  mov    $0x1c4,%esi
  mov    %rax,%rdi
  call   <fgets@plt>
  test   %rax,%rax
  jne    L50
  mov    $0xfffffffe,%eax
L267:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L2
  call   <__stack_chk_fail@plt>
L2:
  leave
  ret
```

assistant: ```c
int getvalue(FILE *conf, char const *key, char *value) {
  char readbuff[(2 * 216 + 20)];
  char keybuff[216];
  char *pb, *pkey, *pval;
  fseek(conf, 0L, SEEK_SET);
  while (NULL != fgets(readbuff, (2 * 216 + 20), conf)) {
    pb = readbuff;
    pkey = keybuff;
    pval = value;
    while (isspace(*pb))
      ++pb;
    if ('#' == *pb || '\0' == *pb)
      continue;
    while ('\0' != *pb && ('_' == *pb || isalnum(*pb))) {
      if (pkey >= keybuff + 216)
        return -3;
      *pkey++ = *pb++;
    }
    *pkey = '\0';
    while ('=' != *pb && '\0' != *pb)
      ++pb;
    if ('\0' == *pb)
      continue;
    while (isspace(*++pb))
      ;
    if ('\0' == *pb)
      continue;
    if ('"' == *pb)
      ++pb;
    while ('\0' != *pb && '"' != *pb) {
      if (pval >= value + 216)
        return -3;
      *pval++ = *pb++;
    }
    *pval = '\0';
    if (!strcmp(key, keybuff)) {
      return 0;
    }
  }
  return -2;
}
```