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23 lines
852 B
Groff
23 lines
852 B
Groff
.TH buffer_getn 3
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.SH NAME
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buffer_getn \- read binary data from buffer
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.SH SYNTAX
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.B #include <buffer.h>
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int \fBbuffer_getn\fP(buffer* \fIb\fR,unsigned char* \fIx\fR,unsigned long int \fIlen\fR);
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.SH DESCRIPTION
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buffer_getn copies data to \fIx\fR[0], \fIx\fR[1], ...,
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\fIx\fR[\fIlen\fR-1] from the buffer, calling buffer_feed as needed, and
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returns \fIlen\fR.
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If a read error occurs, buffer_getn returns -1 and sets \fIerrno\fR
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appropriately. It may then have put any number between 0 and \fIlen\fR
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in the buffer, you can't tell. That makes this function only useful if
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you don't care when an error occurs. Use buffer_get otherwise.
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If the read operation signals end-of-file before \fIlen\fR bytes were
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read, buffer_getn returns the number of bytes read from the buffer
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before end-of-file.
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.SH "SEE ALSO"
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buffer_init(3), buffer_get(3), buffer(3)
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