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HEAD
Feldman's stdio changes
[unix-history]
/
usr
/
src
/
lib
/
libc
/
stdio
/
ungetc.c
/* @(#)ungetc.c 4.1 (Berkeley) %G% */
#include <stdio.h>
ungetc
(
c
,
iop
)
register
FILE
*
iop
;
{
if
(
c
==
EOF
)
return
(-
1
);
if
((
iop
->
_flag
&
_IOREAD
)==
0
||
iop
->
_ptr
<=
iop
->
_base
)
if
(
iop
->
_ptr
==
iop
->
_base
&&
iop
->
_cnt
==
0
)
*
iop
->
_ptr
++;
else
return
(-
1
);
iop
->
_cnt
++;
*--
iop
->
_ptr
=
c
;
return
(
0
);
}