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

```asm
<read_string>:
  endbr64
  push   %r13
  push   %r12
  mov    %rsi,%r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  mov    %rdx,%rbx
  sub    $0x68,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  test   %rsi,%rsi
  je     L77
  test   %rbp,%rbp
  je     L76
L50:
  test   %rbx,%rbx
  je     L0
L33:
  cmpb   $0x2a,(%r12)
  je     L2
  mov    %rbp,%rdi
  mov    %r12,%rsi
  call   <find_string@plt>
  mov    %rax,%rdi
L94:
  mov    %rbx,%rdx
  lea    D111(%rip),%rsi
  call   <sscanf@plt>
  test   %rax,%rax
  je     L28
L86:
  mov    %r12,%rdi
  call   <strlen@plt>
  mov    $0xf,%esi
  mov    %eax,%edi
  call   <min_int@plt>
  mov    0x58(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L32
  add    $0x68,%rsp
  lea    D39(%rip),%rdx
  mov    %rbx,%r8
  mov    %rbp,%rsi
  pop    %rbx
  lea    (%rax,%rdx,1),%rcx
  pop    %rbp
  mov    %r12,%rdx
  lea    D2(%rip),%rdi
  pop    %r12
  pop    %r13
  jmp    10f0 <printf@plt>
  nopl   (%rax)
L2:
  mov    %rbp,%rdi
  lea    0x1(%r12),%rsi
  call   <find_string@plt>
  mov    %rax,%rdi
  jmp    L94
  nopw   0x0(%rax,%rax,1)
L28:
  mov    %rsp,%r13
  mov    %r12,%r8
  lea    D3(%rip),%rdx
  mov    %rbp,%rcx
  mov    %r13,%rdi
  lea    D74(%rip),%rsi
  call   <sprintf@plt>
  mov    %r13,%rdx
  mov    $0xaa,%edi
  lea    D1(%rip),%rsi
  call   <errhandler@plt>
  jmp    L86
L0:
  lea    D117(%rip),%rdx
  lea    D1(%rip),%rsi
  mov    $0xa2,%edi
  call   <errhandler@plt>
  jmp    L33
  nopl   (%rax)
L77:
  lea    D102(%rip),%rdx
  lea    D1(%rip),%rsi
  mov    $0xa0,%edi
  call   <errhandler@plt>
  test   %rbp,%rbp
  jne    L50
  nopl   0x0(%rax)
L76:
  lea    D46(%rip),%rdx
  lea    D1(%rip),%rsi
  mov    $0xa1,%edi
  call   <errhandler@plt>
  jmp    L50
L32:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: data_tag: D111
type_guessed: string
name: unpack_data
arguments: data_tag: D39
type_guessed: string
name: unpack_data
arguments: data_tag: D2
type_guessed: string
name: unpack_data
arguments: data_tag: D3
type_guessed: string
name: unpack_data
arguments: data_tag: D74
type_guessed: string
name: unpack_data
arguments: data_tag: D1
type_guessed: string
name: unpack_data
arguments: data_tag: D117
type_guessed: string
name: unpack_data
arguments: data_tag: D102
type_guessed: string
name: unpack_data
arguments: data_tag: D46
type_guessed: string

tool: D111: %s

tool: D39:                

tool: D2: File: %s		%s%s= %s


tool: D3: wrong format

tool: D74:  %s  File: %s   Variable: %s 

tool: D1: /scratch/repos/new/home/jordi_armengol_estape/c-scraper/outputs/2022-01-22/02-19-57/repos/nathanwbrei/cfdlab/refs/heads/master/worksheet2/helper.c

tool: D117: null pointer given as variable

tool: D102: null pointer given as variable name

tool: D46: null pointer given as filename

assistant: ```c
void read_string(const char *szFileName, const char *szVarName, char *pVariable) {
  char *szValue = NULL;
  if (szVarName == 0)
    errhandler(160, "/scratch/repos/new/home/jordi_armengol_estape/c-scraper/outputs/2022-01-22/02-19-57/repos/nathanwbrei/cfdlab/refs/heads/master/worksheet2/helper.c", "null pointer given as variable name");
  if (szFileName == 0)
    errhandler(161, "/scratch/repos/new/home/jordi_armengol_estape/c-scraper/outputs/2022-01-22/02-19-57/repos/nathanwbrei/cfdlab/refs/heads/master/worksheet2/helper.c", "null pointer given as filename");
  if (pVariable == 0)
    errhandler(162, "/scratch/repos/new/home/jordi_armengol_estape/c-scraper/outputs/2022-01-22/02-19-57/repos/nathanwbrei/cfdlab/refs/heads/master/worksheet2/helper.c", "null pointer given as variable");
  if (szVarName[0] == '*')
    szValue = find_string(szFileName, szVarName + 1);
  else
    szValue = find_string(szFileName, szVarName);
  if (sscanf(szValue, "%s", pVariable) == 0) {
    char szTmp[80];
    if (0)
      sprintf(szTmp, " %s  File: %s   Variable: %s  Line: %d", "wrong format", szFileName, szVarName, 0);
    else
      sprintf(szTmp, " %s  File: %s   Variable: %s ", "wrong format", szFileName, szVarName);
    errhandler(170, "/scratch/repos/new/home/jordi_armengol_estape/c-scraper/outputs/2022-01-22/02-19-57/repos/nathanwbrei/cfdlab/refs/heads/master/worksheet2/helper.c", szTmp);
  };
  printf("File: %s\t\t%s%s= %s\n", szFileName, szVarName, &("               "[min_int((int)strlen(szVarName), 15)]), pVariable);
}
```