Is there function that returns index of first null character in a string ?

char desc[20];

some code has added characters to desc character array.

Is there function that returns index of first null in the string.

For example,
desc[0] = 'N'
desc[1] = 'O'
desc[2] = 'T'
desc[3] = '  '
desc[4] = 'S'
desc[5] = 'E'
desc[6] = 'T'
desc[7] = 'NUL'
desc[8] = 'NUL'
desc[9] = 'NUL'
desc[10] = 'NUL'

I'm looking for a function that I can call that returns index of first 'NUL' in the string.
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Sure, it's simply 'strlen()', e.g.

int index = strlen(desc);

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Um, I somehow guess that this is overkill to find the first NULL byte ;o)
If you wanted to get a pointer to the NUL, you can use strchr:
  char desc[] = "Not Set\0\0\0";
  int index = strlen(desc);
  char * ptrNul = strchr( desc, 0 );

  std::cout << "index = " << index
     << "  and ptrNul - desc = " << ptrNul-desc << std::endl;

  std::cout << " *ptrNul = " << static_cast<int>(*ptrNul) << std::endl;
  std::cout << " *ptrNul = " << *ptrNul << std::endl;

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