Bug in putc

[Steve Harris]

There is a bug in the putc macro, in stdio.h.
Putc returns an int which contains the char you have just "put".
However, (at least on both a Pixel and a Sun), the result is sign extended;
if the 8th bit of the char is set, the return value from putc does not equal
the character you put!  To fix, replace the putc macro with the following:

#define putc(x,p) ((int) ((--(p)->_cnt>=0? ((unsigned char)(*(p)->_ptr++=(x))):(unsigned char)_flsbuf((x),p))))
-- 

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