[#BloombergLP-bdlsb-FixedMemInput-sputbackc]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/FixedMemInput.adoc[FixedMemInput]::sputbackc
:relfileprefix: ../../../
:mrdocs:

Put back the specified character if it matches the previous character.

== Synopsis

Declared in `<bdlsb_fixedmeminput.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bdlsb/FixedMemInput/int_type.adoc[FixedMemInput::int_type]
sputbackc(char c);
----

== Description

Move the current read position back one character if the current read position is not at the beginning of the buffer and the previous position contains the specified character `c`, and return that character. Otherwise, return `traits_type::eof()` and do not move the current read position.

== Return Value

`c` on success, or `traits_type::eof()` on failure

== Parameters

[cols="1,4"]
|===
| Name| Description
| *c*
| character that must match the previous character in the buffer
|===


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