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4.49 puts—write a character string

Synopsis 

     #include <stdio.h>
     int puts(const char *s);
     
     int _puts_r(struct _reent *reent, const char *s);

Description
puts writes the string at s (followed by a newline, instead of the trailing null) to the standard output stream.

The alternate function _puts_r is a reentrant version. The extra argument reent is a pointer to a reentrancy structure.
Returns
If successful, the result is a nonnegative integer; otherwise, the result is EOF.
Portability
ANSI C requires puts, but does not specify that the result on success must be 0; any non-negative value is permitted.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.