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

```asm
<updater_addelta>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%r14
  mov    %rsi,%rbp
  mov    %rdx,0x8(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  lea    0x8(%rsp),%rbx
  mov    %rbx,%rdi
  call   <proto_get_ascii@plt>
  mov    %rax,%r13
  mov    %rbx,%rdi
  call   <proto_get_ascii@plt>
  mov    %rax,%r15
  mov    %rbx,%rdi
  call   <proto_get_ascii@plt>
  mov    %rax,%r12
  mov    %rbx,%rdi
  call   <proto_get_ascii@plt>
  mov    %rax,%rcx
  movq   $0x0,0x18(%rsp)
  test   %r13,%r13
  sete   %al
  test   %r12,%r12
  sete   %dl
  or     %dl,%al
  jne    L46
  test   %rcx,%rcx
  je     L46
  mov    %r15,%r8
  mov    %r12,%rdx
  mov    %r13,%rsi
  mov    %r14,%rdi
  call   <rcsfile_addelta@plt>
  mov    %rax,%r12
  test   %rax,%rax
  je     L288
  lea    D39(%rip),%r13
  lea    D26(%rip),%r14
  jmp    L269
L288:
  mov    %r13,%rdx
  lea    D2(%rip),%rsi
  mov    $0xffffffff,%edi
  call   <lprintf@plt>
  mov    $0xfffffffd,%eax
  jmp    L231
L225:
  cmpb   $0x2e,(%rbx)
  je     L269
L274:
  mov    0x18(%rsp),%rdx
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <rcsdelta_appendlog@plt>
  test   %eax,%eax
  js     L241
  mov    %r15,%rsi
  mov    %rbp,%rdi
  call   <stream_getln@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L269
L353:
  mov    0x18(%rsp),%rax
  cmp    $0x2,%rax
  je     L225
  cmp    $0x3,%rax
  je     L224
L22:
  cmpq   $0x2,0x18(%rsp)
  jbe    L274
  mov    $0x2,%edx
  mov    %r13,%rsi
  mov    %rbx,%rdi
  call   <memcmp@plt>
  test   %eax,%eax
  jne    L274
  subq   $0x1,0x18(%rsp)
  add    $0x1,%rbx
  jmp    L274
L224:
  mov    $0x2,%edx
  mov    %r14,%rsi
  mov    %rbx,%rdi
  call   <memcmp@plt>
  test   %eax,%eax
  jne    L22
  mov    $0xffffffff,%esi
  mov    %r12,%rdi
  call   <rcsdelta_truncatelog@plt>
  jmp    L269
L369:
  lea    0x20(%rsp),%rdi
  call   <proto_get_ascii@plt>
  mov    %rax,%rsi
  test   %rax,%rax
  je     L289
  mov    %r12,%rdi
  call   <rcsdelta_setstate@plt>
L269:
  mov    $0x0,%esi
  mov    %rbp,%rdi
  call   <stream_getln@plt>
  mov    %rax,%rdi
  mov    %rax,0x20(%rsp)
  test   %rax,%rax
  je     L165
  lea    D29(%rip),%rsi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L21
  lea    0x20(%rsp),%rdi
  call   <proto_get_ascii@plt>
  movzbl (%rax),%eax
  cmp    $0x53,%al
  je     L369
  cmp    $0x54,%al
  je     L114
  cmp    $0x4c,%al
  jne    L269
  lea    0x18(%rsp),%rsi
  mov    %rbp,%rdi
  call   <stream_getln@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L269
  lea    0x18(%rsp),%r15
  jmp    L353
L114:
  lea    0x18(%rsp),%rsi
  mov    %rbp,%rdi
  call   <stream_getln@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L269
  lea    0x18(%rsp),%r15
  jmp    L125
L238:
  cmpb   $0x2e,(%rbx)
  je     L269
L357:
  mov    0x18(%rsp),%rdx
  mov    %rbx,%rsi
  mov    %r12,%rdi
  call   <rcsdelta_appendtext@plt>
  test   %eax,%eax
  js     L154
  mov    %r15,%rsi
  mov    %rbp,%rdi
  call   <stream_getln@plt>
  mov    %rax,%rbx
  test   %rax,%rax
  je     L269
L125:
  mov    0x18(%rsp),%rax
  cmp    $0x2,%rax
  je     L238
  cmp    $0x3,%rax
  je     L345
L275:
  cmpq   $0x2,0x18(%rsp)
  jbe    L357
  mov    $0x2,%edx
  mov    %r13,%rsi
  mov    %rbx,%rdi
  call   <memcmp@plt>
  test   %eax,%eax
  jne    L357
  subq   $0x1,0x18(%rsp)
  add    $0x1,%rbx
  jmp    L357
L345:
  mov    $0x2,%edx
  mov    %r14,%rsi
  mov    %rbx,%rdi
  call   <memcmp@plt>
  test   %eax,%eax
  jne    L275
  mov    $0xffffffff,%esi
  mov    %r12,%rdi
  call   <rcsdelta_truncatetext@plt>
  jmp    L269
L165:
  mov    $0x0,%eax
  jmp    L231
L46:
  mov    $0xffffffff,%eax
  jmp    L231
L21:
  mov    $0x0,%eax
  jmp    L231
L241:
  mov    $0xffffffff,%eax
L231:
  mov    0x28(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L104
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L289:
  mov    $0xffffffff,%eax
  jmp    L231
L154:
  mov    $0xffffffff,%eax
  jmp    L231
L104:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: retrieve_data
arguments: tag: D39
datatype: string
name: retrieve_data
arguments: tag: D26
datatype: string
name: retrieve_data
arguments: tag: D2
datatype: string
name: retrieve_data
arguments: tag: D29
datatype: string

tool: D39: ..

tool: D26: .+

tool: D2: Error adding delta %s


tool: D29: .

assistant: ```c
int updater_addelta(struct rcsfile *rf, struct stream *rd, char *cmdline) {
  struct delta *d;
  size_t size;
  char *author, *cmd, *diffbase, *line, *logline;
  char *revdate, *revnum, *state, *textline;
  revnum = proto_get_ascii(&cmdline);
  diffbase = proto_get_ascii(&cmdline);
  revdate = proto_get_ascii(&cmdline);
  author = proto_get_ascii(&cmdline);
  size = 0;
  if (revnum == NULL || revdate == NULL || author == NULL)
    return ((-1));
  d = rcsfile_addelta(rf, revnum, revdate, author, diffbase);
  if (d == NULL) {
    lprintf(-1, "Error adding delta %s\n", revnum);
    return ((-3));
  }
  while ((line = stream_getln(rd, NULL)) != NULL) {
    if (strcmp(line, ".") == 0)
      break;
    cmd = proto_get_ascii(&line);
    switch (cmd[0]) {
    case 'L':
      logline = stream_getln(rd, &size);
      while (logline != NULL) {
        if (size == 2 && *logline == '.')
          break;
        if (size == 3 && memcmp(logline, ".+", 2) == 0) {
          rcsdelta_truncatelog(d, -1);
          break;
        }
        if (size >= 3 && memcmp(logline, "..", 2) == 0) {
          size--;
          logline++;
        }
        if (rcsdelta_appendlog(d, logline, size) < 0)
          return (-1);
        logline = stream_getln(rd, &size);
      }
      break;
    case 'N':
    case 'n':
      break;
    case 'S':
      state = proto_get_ascii(&line);
      if (state == NULL)
        return ((-1));
      rcsdelta_setstate(d, state);
      break;
    case 'T':
      textline = stream_getln(rd, &size);
      while (textline != NULL) {
        if (size == 2 && *textline == '.')
          break;
        if (size == 3 && memcmp(textline, ".+", 2) == 0) {
          rcsdelta_truncatetext(d, -1);
          break;
        }
        if (size >= 3 && memcmp(textline, "..", 2) == 0) {
          size--;
          textline++;
        }
        if (rcsdelta_appendtext(d, textline, size) < 0)
          return (-1);
        textline = stream_getln(rd, &size);
      }
      break;
    }
  }
  return (0);
}
```