user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<my_searchenv2>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %rsi,-0x60(%rbp)
  mov    %rdx,-0x68(%rbp)
  mov    %ecx,-0x6c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    -0x68(%rbp),%rax
  movb   $0x0,(%rax)
  mov    -0x58(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jne    L25
  mov    -0x6c(%rbp),%edx
  mov    -0x58(%rbp),%rcx
  mov    -0x68(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  jmp    L43
L25:
  mov    -0x60(%rbp),%rax
  mov    %rax,%rdi
  call   <getenv@plt>
  mov    %rax,-0x40(%rbp)
  cmpq   $0x0,-0x40(%rbp)
  jne    L98
  lea    D5(%rip),%rax
  mov    %rax,-0x40(%rbp)
L98:
  mov    -0x40(%rbp),%rax
  mov    %rax,%rdi
  call   <strdup@plt>
  mov    %rax,-0x30(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x38(%rbp)
  jmp    L92
L74:
  mov    -0x28(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  mov    %eax,%ebx
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  add    %ebx,%eax
  add    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  jne    L27
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  jmp    L43
L27:
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcpy@plt>
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <strlen@plt>
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  je     L69
  mov    -0x20(%rbp),%rax
  lea    D17(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
L69:
  mov    -0x58(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcat@plt>
  lea    -0x4c(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <stat@plt>
  test   %eax,%eax
  jne    L38
  mov    -0x6c(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    -0x20(%rbp),%rcx
  mov    -0x68(%rbp),%rax
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strncpy@plt>
  mov    -0x6c(%rbp),%eax
  cltq
  lea    -0x1(%rax),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movb   $0x0,(%rax)
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  jmp    L43
L38:
  movq   $0x0,-0x38(%rbp)
L92:
  lea    -0x48(%rbp),%rdx
  mov    -0x38(%rbp),%rax
  lea    D26(%rip),%rcx
  mov    %rcx,%rsi
  mov    %rax,%rdi
  call   <strtok_r@plt>
  mov    %rax,-0x28(%rbp)
  cmpq   $0x0,-0x28(%rbp)
  jne    L74
  mov    -0x30(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
L43:
  mov    -0x18(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L71
  call   <__stack_chk_fail@plt>
L71:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: read_data
arguments: data_label: D5
data_type: string
name: read_data
arguments: data_label: D17
data_type: string
name: read_data
arguments: data_label: D26
data_type: string

tool: D5: .

tool: D17: /

tool: D26: :

assistant: ```c
void my_searchenv2(char *name, char *envname, char *hitfile, int hitlen) {
  char *env;
  char *envcopy;
  char *envcopy2;
  char *cp;
  char *last;
  *hitfile = 0;
  if (name[0] == '/') {
    strncpy(hitfile, name, hitlen);
    return;
  }
  env = getenv(envname);
  if (env == NULL) {
    env = ".";
  }
  envcopy = strdup(env);
  envcopy2 = envcopy;
  while ((cp = strtok_r(envcopy2, ":", &last)) != NULL) {
    struct stat info;
    char *concat = malloc(strlen(cp) + strlen(name) + 2);
    if (concat == NULL) {
      free(envcopy);
      return;
    }
    strcpy(concat, cp);
    if (concat[strlen(concat) - 1] != '/')
      strcat(concat, "/");
    strcat(concat, name);
    if (!stat(concat, &info)) {
      strncpy(hitfile, concat, hitlen - 1);
      hitfile[hitlen - 1] = 0;
      free(envcopy);
      return;
    }
    envcopy2 = NULL;
  }
  free(envcopy);
}
```