user: 请从给定的汇编指令推导出C源代码:

```asm
<a_link>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %rdi,%r13
  mov    $0x5b,%esi
  call   <match@plt>
  test   %eax,%eax
  jne    L124
L66:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L124:
  mov    $0xa,%edi
  call   <malloc@plt>
  mov    %rax,%r14
  mov    $0x0,%ebp
  mov    $0xa,%r15d
  jmp    L32
L137:
  mov    %bl,(%r14,%rbp,1)
  mov    %r13,%rdi
  call   <consume@plt>
  add    $0x1,%rbp
L32:
  mov    %ebp,%r12d
  mov    %ebp,0x8(%rsp)
  mov    %r13,%rdi
  call   <next@plt>
  mov    %eax,%ebx
  cmp    $0xffffffff,%eax
  je     L108
  cmp    $0x5d,%eax
  je     L108
  lea    -0x1(%r15),%eax
  add    $0x1,%r12d
  cmp    %r12d,%eax
  jg     L137
  add    %r15d,%r15d
  mov    %r15d,%esi
  mov    %r14,%rdi
  call   <realloc@plt>
  mov    %rax,%r14
  jmp    L137
L108:
  movslq 0x8(%rsp),%rax
  movb   $0x0,(%r14,%rax,1)
  mov    $0x5d,%esi
  mov    %r13,%rdi
  call   <match@plt>
  test   %eax,%eax
  je     L66
  mov    $0x28,%esi
  mov    %r13,%rdi
  call   <match@plt>
  test   %eax,%eax
  je     L66
  mov    $0xa,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  mov    $0x0,%ebp
  mov    $0xa,%r15d
  jmp    L140
L122:
  mov    %bl,(%r12,%rbp,1)
  mov    %r13,%rdi
  call   <consume@plt>
  add    $0x1,%rbp
L140:
  mov    %ebp,0x8(%rsp)
  mov    %ebp,0xc(%rsp)
  mov    %r13,%rdi
  call   <next@plt>
  mov    %eax,%ebx
  cmp    $0xffffffff,%eax
  je     L17
  cmp    $0x29,%eax
  je     L17
  lea    -0x1(%r15),%edx
  mov    0x8(%rsp),%eax
  add    $0x1,%eax
  cmp    %eax,%edx
  jg     L122
  add    %r15d,%r15d
  mov    %r15d,%esi
  mov    %r12,%rdi
  call   <realloc@plt>
  mov    %rax,%r12
  jmp    L122
L17:
  movslq 0xc(%rsp),%rax
  movb   $0x0,(%r12,%rax,1)
  mov    $0x29,%esi
  mov    %r13,%rdi
  call   <match@plt>
  test   %eax,%eax
  je     L66
  mov    %r14,%rcx
  mov    %r12,%rdx
  lea    D2(%rip),%rsi
  mov    %r13,%rdi
  call   <parser_emit_string@plt>
  mov    %r12,%rdi
  call   <free@plt>
  mov    %r14,%rdi
  call   <free@plt>
  mov    $0x1,%eax
  jmp    L66
```

tool_calls: name: read_data
arguments: tag: D2
datatype: string

tool: D2: <a href="%s">%s</a>

assistant: ```c
bool a_link(struct cymkd_parser *parser) {
  int ch;
  int len;
  int bufsize;
  char *link_text;
  char *link_href;
  if (!match(parser, '[')) {
    return false;
  }
  bufsize = 10;
  len = 0;
  link_text = malloc(bufsize);
  while ((ch = next(parser)) != ']' && ch != -1) {
    if (len + 1 >= bufsize - 1) {
      bufsize *= 2;
      link_text = realloc(link_text, bufsize);
    }
    link_text[len] = ch;
    len++;
    consume(parser);
  }
  link_text[len] = '\0';
  if (!match(parser, ']')) {
    return false;
  }
  if (!match(parser, '(')) {
    return false;
  }
  bufsize = 10;
  len = 0;
  link_href = malloc(bufsize);
  while ((ch = next(parser)) != ')' && ch != -1) {
    if (len + 1 >= bufsize - 1) {
      bufsize *= 2;
      link_href = realloc(link_href, bufsize);
    }
    link_href[len] = ch;
    len++;
    consume(parser);
  }
  link_href[len] = '\0';
  if (!match(parser, ')')) {
    return false;
  }
  parser_emit_string(parser, "<a href=\"%s\">%s</a>", link_href, link_text);
  free(link_href);
  free(link_text);
  return true;
}
```