user: 请从给定的汇编指令推导出C源代码:

```asm
<irafrdhead>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,%r13
  mov    %rsi,%r14
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  movl   $0x0,(%rsi)
  lea    D22(%rip),%rsi
  call   <fopen@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L88
  mov    $0x2,%edx
  mov    $0x0,%esi
  mov    %rax,%rdi
  call   <fseek@plt>
  test   %rax,%rax
  jne    L60
  mov    %rbx,%rdi
  call   <ftell@plt>
  mov    %rax,%r12
  test   %rax,%rax
  js     L11
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    %rbx,%rdi
  call   <fseek@plt>
  test   %rax,%rax
  jne    L113
  lea    0x1388(%r12),%r15d
  mov    %r15d,%esi
  mov    $0x1,%edi
  call   <calloc@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L91
  mov    %r15d,(%r14)
  mov    %rbx,%rcx
  mov    %r12,%rdx
  mov    $0x1,%esi
  mov    %rax,%rdi
  call   <fread@plt>
  mov    %eax,%r12d
  mov    %rbx,%rdi
  call   <fclose@plt>
  cmp    $0x3ff,%r12d
  jle    L1
L107:
  mov    0x58(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L75
  mov    %rbp,%rax
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L88:
  lea    D52(%rip),%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  mov    %rbx,%rbp
  jmp    L107
L60:
  lea    D65(%rip),%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  mov    $0x0,%ebp
  jmp    L107
L11:
  lea    D49(%rip),%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  mov    $0x0,%ebp
  jmp    L107
L113:
  lea    D67(%rip),%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  mov    $0x0,%ebp
  jmp    L107
L91:
  mov    %rsp,%rbx
  mov    %r15d,%edx
  lea    D54(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <sprintf@plt>
  mov    %rbx,%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  jmp    L107
L1:
  mov    %rsp,%rbx
  mov    $0x400,%ecx
  mov    %r12d,%edx
  lea    D17(%rip),%rsi
  mov    %rbx,%rdi
  mov    $0x0,%eax
  call   <sprintf@plt>
  mov    %rbx,%rdi
  call   <ffpmsg@plt>
  mov    %r13,%rdi
  call   <ffpmsg@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  mov    $0x0,%ebp
  jmp    L107
L75:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: tag: D22
type: string
name: disassemble_data
arguments: tag: D52
type: string
name: disassemble_data
arguments: tag: D65
type: string
name: disassemble_data
arguments: tag: D49
type: string
name: disassemble_data
arguments: tag: D67
type: string
name: disassemble_data
arguments: tag: D54
type: string
name: disassemble_data
arguments: tag: D17
type: string

tool: D22: rb

tool: D52: unable to open IRAF header file:

tool: D65: IRAFRHEAD: cannot seek in file:

tool: D49: IRAFRHEAD: cannot get pos. in file:

tool: D67: IRAFRHEAD: cannot seek to beginning of file:

tool: D54: IRAFRHEAD Cannot allocate %d-byte header

tool: D17: IRAFRHEAD header file: %d / %d bytes read.

assistant: ```c
char *irafrdhead(const char *filename, int *lihead) {
  FILE *fd;
  int nbr;
  char *irafheader;
  char errmsg[81];
  long nbhead;
  int nihead;
  *lihead = 0;
  fd = fopen(filename, "rb");
  if (fd == NULL) {
    ffpmsg("unable to open IRAF header file:");
    ffpmsg(filename);
    return (NULL);
  }
  if (fseek(fd, 0, 2) != 0) {
    ffpmsg("IRAFRHEAD: cannot seek in file:");
    ffpmsg(filename);
    return (NULL);
  }
  nbhead = ftell(fd);
  if (nbhead < 0) {
    ffpmsg("IRAFRHEAD: cannot get pos. in file:");
    ffpmsg(filename);
    return (NULL);
  }
  if (fseek(fd, 0, 0) != 0) {
    ffpmsg("IRAFRHEAD: cannot seek to beginning of file:");
    ffpmsg(filename);
    return (NULL);
  }
  nihead = nbhead + 5000;
  irafheader = (char *)calloc(1, nihead);
  if (irafheader == NULL) {
    sprintf(errmsg, "IRAFRHEAD Cannot allocate %d-byte header", nihead);
    ffpmsg(errmsg);
    ffpmsg(filename);
    return (NULL);
  }
  *lihead = nihead;
  nbr = fread(irafheader, 1, nbhead, fd);
  fclose(fd);
  if (nbr < 1024) {
    sprintf(errmsg, "IRAFRHEAD header file: %d / %d bytes read.", nbr, 1024);
    ffpmsg(errmsg);
    ffpmsg(filename);
    free(irafheader);
    return (NULL);
  }
  return (irafheader);
}
```