user: What would the C source look like for the assembly code provided here:

```asm
<writeMainPvd>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x40(%rbp)
  lea    D33(%rip),%rax
  mov    %rax,%rdi
  call   <opendir@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L123
  jmp    L125
L19:
  mov    -0x20(%rbp),%rax
  mov    (%rax),%eax
  lea    -0x44(%rbp),%rdx
  lea    D108(%rip),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <sscanf@plt>
  mov    %eax,-0x30(%rbp)
  cmpl   $0x0,-0x30(%rbp)
  je     L125
  addl   $0x1,-0x40(%rbp)
L125:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <readdir@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  jne    L19
L123:
  mov    -0x40(%rbp),%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x18(%rbp)
  movl   $0x0,-0x40(%rbp)
  lea    D33(%rip),%rax
  mov    %rax,%rdi
  call   <opendir@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  je     L107
  jmp    L147
L21:
  mov    -0x20(%rbp),%rax
  mov    (%rax),%eax
  lea    -0x44(%rbp),%rdx
  lea    D108(%rip),%rcx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <sscanf@plt>
  mov    %eax,-0x30(%rbp)
  cmpl   $0x0,-0x30(%rbp)
  je     L147
  mov    -0x40(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rax,%rdx
  mov    -0x44(%rbp),%eax
  mov    %eax,(%rdx)
  addl   $0x1,-0x40(%rbp)
L147:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <readdir@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  jne    L21
L107:
  movl   $0x0,-0x3c(%rbp)
  jmp    L51
L49:
  movl   $0x0,-0x38(%rbp)
  jmp    L77
L13:
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    (%rax),%eax
  cmp    %eax,%edx
  jle    L78
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x38(%rbp),%edx
  movslq %edx,%rdx
  add    $0x1,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x18(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rax,%rdx
  mov    -0x2c(%rbp),%eax
  mov    %eax,(%rdx)
L78:
  addl   $0x1,-0x38(%rbp)
L77:
  mov    -0x40(%rbp),%eax
  sub    $0x1,%eax
  sub    -0x3c(%rbp),%eax
  cmp    %eax,-0x38(%rbp)
  jl     L13
  addl   $0x1,-0x3c(%rbp)
L51:
  mov    -0x40(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x3c(%rbp)
  jl     L49
  lea    D63(%rip),%rax
  mov    %rax,%rsi
  lea    D104(%rip),%rax
  mov    %rax,%rdi
  call   <fopen@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x10(%rbp),%rax
  mov    %rax,%rcx
  mov    $0x44,%edx
  mov    $0x1,%esi
  lea    D96(%rip),%rax
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rcx
  mov    $0xf,%edx
  mov    $0x1,%esi
  lea    D18(%rip),%rax
  mov    %rax,%rdi
  call   <fwrite@plt>
  movl   $0x0,-0x34(%rbp)
  jmp    L39
L128:
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  lea    D11(%rip),%rsi
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fprintf@plt>
  addl   $0x1,-0x34(%rbp)
L39:
  mov    -0x34(%rbp),%eax
  cmp    -0x40(%rbp),%eax
  jl     L128
  mov    -0x10(%rbp),%rax
  mov    %rax,%rcx
  mov    $0x10,%edx
  mov    $0x1,%esi
  lea    D10(%rip),%rax
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rcx
  mov    $0xb,%edx
  mov    $0x1,%esi
  lea    D84(%rip),%rax
  mov    %rax,%rdi
  call   <fwrite@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <fclose@plt>
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L146
  call   <__stack_chk_fail@plt>
L146:
  leave
  ret
```

tool_calls: name: read_data
arguments: data_label: D33
datatype: string
name: read_data
arguments: data_label: D108
datatype: string
name: read_data
arguments: data_label: D63
datatype: string
name: read_data
arguments: data_label: D104
datatype: string
name: read_data
arguments: data_label: D96
datatype: string
name: read_data
arguments: data_label: D18
datatype: string
name: read_data
arguments: data_label: D11
datatype: string
name: read_data
arguments: data_label: D10
datatype: string
name: read_data
arguments: data_label: D84
datatype: string

tool: D33: .

tool: D108: %d

tool: D63: w

tool: D104: case.pvd

tool: D96: <VTKFile type="Collection" version="0.1" byte_order="LittleEndian">


tool: D18:   <Collection>


tool: D11:     <DataSet part="0"  timestep="%d" file="%d/fields.pvtu" />


tool: D10:   </Collection>


tool: D84: </VTKFile>


assistant: ```c
void writeMainPvd() {
  uint *tSteps;
  int status, aux;
  uint nt = 0;
  DIR *d;
  struct dirent *dir;
  d = opendir(".");
  if (d) {
    while ((dir = readdir(d)) != NULL) {
      status = sscanf(dir->d_name, "%d", &aux);
      if (status != 0) {
        nt++;
      }
    }
  }
  tSteps = (uint *)malloc(nt * sizeof(uint));
  nt = 0;
  d = opendir(".");
  if (d) {
    while ((dir = readdir(d)) != NULL) {
      status = sscanf(dir->d_name, "%d", &aux);
      if (status != 0) {
        tSteps[nt] = aux;
        nt++;
      }
    }
  }
  {
    int i, j, temp;
    for (i = 0; i < (nt - 1); ++i) {
      for (j = 0; j < (nt - 1) - i; ++j) {
        if (tSteps[j] > tSteps[j + 1]) {
          temp = tSteps[j + 1];
          tSteps[j + 1] = tSteps[j];
          tSteps[j] = temp;
        }
      }
    }
  }
  FILE *file = fopen("case.pvd", "w");
  fprintf(file, "<VTKFile type=\"Collection\" version=\"0.1\" byte_order=\"LittleEndian\">\n");
  fprintf(file, "  <Collection>\n");
  uint i;
  for (i = 0; i < nt; i++) {
    fprintf(file, "    <DataSet part=\"0\"  timestep=\"%d\" file=\"%d/fields.pvtu\" />\n", tSteps[i], tSteps[i]);
  }
  fprintf(file, "  </Collection>\n");
  fprintf(file, "</VTKFile>\n");
  fclose(file);
}
```