user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<_ocesqlConnect>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %rdi,0x8(%rsp)
  mov    %rsi,%rbp
  mov    %edx,%r12d
  mov    %rcx,0x10(%rsp)
  mov    %r8d,0x1c(%rsp)
  mov    %r9,%rbx
  mov    $0x0,%esi
  lea    D38(%rip),%rdi
  call   <ocdb_getenv@plt>
  mov    %rax,%r15
  mov    $0x0,%esi
  lea    D15(%rip),%rdi
  call   <ocdb_getenv@plt>
  mov    %rax,%r14
  mov    $0x0,%esi
  lea    D39(%rip),%rdi
  call   <ocdb_getenv@plt>
  mov    %rax,%r13
  mov    0x60(%rsp),%esi
  mov    %rbx,%rdi
  call   <oc_strndup@plt>
  mov    %eax,%edi
  call   <get_str_without_after_space@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L28
  mov    %rax,%rdi
  call   <strlen@plt>
  test   %rax,%rax
  jle    L28
L24:
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <oc_strndup@plt>
  mov    %eax,%edi
  call   <get_str_without_after_space@plt>
  mov    %rax,%rbp
  test   %rax,%rax
  je     L17
  mov    %rax,%rdi
  call   <strlen@plt>
  test   %rax,%rax
  jle    L17
L69:
  mov    0x1c(%rsp),%esi
  mov    0x10(%rsp),%rdi
  call   <oc_strndup@plt>
  mov    %eax,%edi
  call   <get_str_without_after_space@plt>
  mov    %rax,%r12
  test   %rax,%rax
  je     L115
  mov    %rax,%rdi
  call   <strlen@plt>
  test   %rax,%rax
  jle    L115
L63:
  lea    D26(%rip),%r8
  mov    %r12,%rcx
  mov    %rbp,%rdx
  mov    %rbx,%rsi
  mov    0x8(%rsp),%rdi
  call   <_ocesqlConnectMain@plt>
  mov    %eax,%r13d
  mov    %rbx,%rdi
  call   <free@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <free@plt>
  mov    %r13d,%eax
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L28:
  test   %r15,%r15
  je     L24
  mov    %r15,%rdi
  call   <strdup@plt>
  mov    %rax,%rbx
  jmp    L24
L17:
  test   %r14,%r14
  je     L69
  mov    %r14,%rdi
  call   <strdup@plt>
  mov    %rax,%rbp
  jmp    L69
L115:
  test   %r13,%r13
  je     L63
  mov    %r13,%rdi
  call   <strdup@plt>
  mov    %rax,%r12
  jmp    L63
```

tool_calls: name: retrieve_data
arguments: label: D38
data_type: string
name: retrieve_data
arguments: label: D15
data_type: string
name: retrieve_data
arguments: label: D39
data_type: string
name: retrieve_data
arguments: label: D26
data_type: string

tool: D38: OCDB_DB_NAME

tool: D15: OCDB_DB_USER

tool: D39: OCDB_DB_PASS

tool: D26: OCDB_DEFAULT_DBNAME

assistant: ```c
int _ocesqlConnect(struct sqlca_t *st, char *user, int userlen, char *passwd, int passwdlen, char *name, int namelen, char *atdb) {
  char *dbuser, *dbpasswd, *dbname;
  char *tmpuser, *tmppasswd, *tmpname;
  int ret;
  tmpname = ocdb_getenv("OCDB_DB_NAME", NULL);
  tmpuser = ocdb_getenv("OCDB_DB_USER", NULL);
  tmppasswd = ocdb_getenv("OCDB_DB_PASS", NULL);
  if (((dbname = get_str_without_after_space(oc_strndup(name, namelen))) == NULL) || (strlen(dbname) <= 0)) {
    if (tmpname)
      dbname = strdup(tmpname);
  }
  if (((dbuser = get_str_without_after_space(oc_strndup(user, userlen))) == NULL) || (strlen(dbuser) <= 0)) {
    if (tmpuser)
      dbuser = strdup(tmpuser);
  }
  if (((dbpasswd = get_str_without_after_space(oc_strndup(passwd, passwdlen))) == NULL) || (strlen(dbpasswd) <= 0)) {
    if (tmppasswd)
      dbpasswd = strdup(tmppasswd);
  }
  ret = _ocesqlConnectMain(st, dbname, dbuser, dbpasswd, "OCDB_DEFAULT_DBNAME");
  free(dbname);
  free(dbuser);
  free(dbpasswd);
  return ret;
}
```