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| 1 | .\" @(#)ungetc.3s 6.1 (Berkeley) 5/15/85
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| 2 | .\"
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| 3 | .TH UNGETC 3 "May 15, 1985"
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| 4 | .AT 3
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| 5 | .SH NAME
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| 6 | ungetc \- push character back into input stream
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| 7 | .SH SYNOPSIS
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| 8 | .nf
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| 9 | .ft B
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| 10 | #include <stdio.h>
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| 11 |
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| 12 | int ungetc(int \fIc\fP, FILE *\fIstream\fP)
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| 13 | .ft R
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| 14 | .fi
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| 15 | .SH DESCRIPTION
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| 16 | .B Ungetc
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| 17 | pushes the character
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| 18 | .I c
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| 19 | back on an input stream. That character will be returned by the next
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| 20 | .B getc
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| 21 | call on that stream.
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| 22 | .B Ungetc
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| 23 | returns
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| 24 | .IR c .
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| 25 | .PP
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| 26 | One character of pushback is guaranteed provided
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| 27 | something has been read from the stream and the stream is actually buffered.
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| 28 | Attempts to push EOF are rejected.
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| 29 | .PP
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| 30 | .BR Fseek (3)
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| 31 | erases all memory of pushed back characters.
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| 32 | .SH "SEE ALSO"
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| 33 | .BR getc (3),
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| 34 | .BR setbuf (3),
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| 35 | .BR fseek (3).
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| 36 | .SH DIAGNOSTICS
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| 37 | .B Ungetc
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| 38 | returns
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| 39 | .SM
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| 40 | .B EOF
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| 41 | if it can't push a character back.
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