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> puts(3) only returns "a nonnegative integer on success and EOF on error" How does it decide which nonnegative integer to return?

• robotresearcher 5y ago
  It's arbitrary. The article shows an implementation that returns 10 (ASCII '\n'). But the spec says it doesn't matter, so you should only be using it to test >0 for success.
  • Bayart 5y ago
    The correct implementation is obviously to return 1 on success !
    • _kst_ 5y ago
      The correct implementation is to return any non-negative int value you like.
• woodruffw 5y ago
  That's answered below: > On success, puts(3) appears to return '\n', the newline or line feed (LF) character, which has ASCII value... 10. But note that that isn't standard behavior. The language in POSIX[1] is identical to that in the blog post. `puts` is free to return whatever positive number it wants on return. [1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/puts.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/p...