user: What would the C source look like for the assembly code provided here?

```asm
<ece391_execute>:
  endbr64
  push   %rbp
  push   %rbx
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  sub    $0x428,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x2418(%rsp)
  xor    %eax,%eax
  mov    %rdi,%rbp
  call   <ece391_strlen@plt>
  cmp    $0x3ff,%eax
  jg     L96
  lea    0x2012(%rsp),%rbx
  mov    $0x2f2e,%eax
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  mov    %ax,0x2010(%rsp)
  call   <ece391_strcpy@plt>
  movzbl 0x2012(%rsp),%eax
  mov    %rbx,%rcx
  test   $0xdf,%al
  jne    L136
  jmp    L8
  nop
L152:
  movzbl 0x1(%rdx),%eax
  test   $0xdf,%al
  je     L8
L136:
  mov    %rcx,%rdx
  lea    0x1(%rcx),%rcx
  cmp    $0xa,%al
  jne    L152
  lea    0x2010(%rsp),%rbp
  mov    %rbp,0x10(%rsp)
L116:
  movb   $0x0,(%rdx)
  lea    0x1(%rdx),%rax
  mov    $0x1,%esi
L227:
  movzbl (%rax),%edx
  cmp    $0x20,%dl
  je     L94
L117:
  test   %dl,%dl
  je     L24
  cmp    $0xa,%dl
  je     L24
  mov    %rax,0x10(%rsp,%rsi,8)
  lea    0x1(%rsi),%rdi
  nopw   0x0(%rax,%rax,1)
L233:
  mov    %rax,%rcx
  movzbl 0x1(%rax),%edx
  add    $0x1,%rax
  test   $0xdf,%dl
  je     L206
  cmp    $0xa,%dl
  jne    L233
L12:
  movb   $0x0,(%rax)
  movzbl 0x2(%rcx),%edx
  lea    0x2(%rcx),%rax
  mov    %rdi,%rsi
  cmp    $0x20,%dl
  jne    L117
L94:
  add    $0x1,%rax
  jmp    L227
  nopw   0x0(%rax,%rax,1)
L8:
  lea    0x2010(%rsp),%rbp
  mov    $0x1,%esi
  mov    %rbp,0x10(%rsp)
  test   %al,%al
  jne    L169
L78:
  movq   $0x0,0x10(%rsp,%rsi,8)
  xor    %eax,%eax
  call   <fork@plt>
  test   %rax,%rax
  je     L148
L210:
  lea    0xc(%rsp),%rdi
  call   <wait@plt>
  mov    0xc(%rsp),%edi
  call   <WIFEXITED@plt>
  mov    0xc(%rsp),%edi
  test   %rax,%rax
  jne    L26
  call   <WTERMSIG@plt>
  cmp    $0x9,%eax
  je     L96
  mov    $0x100,%eax
L10:
  mov    0x2418(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L180
  add    $0x2428,%rsp
  pop    %rbx
  pop    %rbp
  ret
  nopw   0x0(%rax,%rax,1)
L206:
  mov    %rdi,%rsi
  test   %dl,%dl
  je     L227
  jmp    L12
L24:
  movb   $0x0,(%rax)
  jmp    L78
L26:
  call   <WEXITSTATUS@plt>
  jmp    L10
L148:
  lea    0x10(%rsp),%rsi
  mov    %rbp,%rdi
  call   <execv@plt>
  xor    %eax,%eax
  call   <getpid@plt>
  mov    $0x9,%esi
  mov    %eax,%edi
  call   <kill@plt>
  jmp    L210
L169:
  mov    %rcx,%rdx
  jmp    L116
L96:
  mov    $0xffffffff,%eax
  jmp    L10
L180:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int32_t ece391_execute(const uint8_t *command) {
  int status;
  uint8_t buf[1026];
  char *args[1024];
  uint8_t *scan;
  uint32_t n_arg;
  if (1023 < ece391_strlen(command))
    return -1;
  buf[0] = '.';
  buf[1] = '/';
  ece391_strcpy(buf + 2, command);
  for (scan = buf + 2; '\0' != *scan && ' ' != *scan && '\n' != *scan; scan++)
    ;
  args[0] = (char *)buf;
  n_arg = 1;
  if ('\0' != *scan) {
    *scan++ = '\0';
    while (1) {
      while (' ' == *scan)
        scan++;
      if ('\0' == *scan || '\n' == *scan) {
        *scan = '\0';
        break;
      }
      args[n_arg++] = (char *)scan;
      while ('\0' != *scan && ' ' != *scan && '\n' != *scan)
        scan++;
      if ('\0' != *scan)
        *scan++ = '\0';
    }
  }
  args[n_arg] = NULL;
  if (0 == fork()) {
    execv((char *)buf, args);
    kill(getpid(), 9);
  }
  (void)wait(&status);
  if (WIFEXITED(status))
    return WEXITSTATUS(status);
  if (9 == WTERMSIG(status))
    return -1;
  return 256;
}
```