1105 lines
12 KiB
HTML
1105 lines
12 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of Buffer</TITLE>
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</HEAD><BODY>
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<H1>Buffer</H1>
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Section: OCaml library (3o)<BR>Updated: 2020-01-30<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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Buffer - Extensible buffers.
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<A NAME="lbAC"> </A>
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<H2>Module</H2>
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Module Buffer
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<A NAME="lbAD"> </A>
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<H2>Documentation</H2>
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<P>
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Module
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<B>Buffer</B>
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<BR> :
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<B>sig end</B>
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<P>
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<P>
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Extensible buffers.
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<P>
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This module implements buffers that automatically expand
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as necessary. It provides accumulative concatenation of strings
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in quasi-linear time (instead of quadratic time when strings are
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concatenated pairwise).
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<P>
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<P>
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<P>
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<P>
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<P>
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<I>type t </I>
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<P>
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<P>
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The abstract type of buffers.
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<P>
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<P>
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<P>
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<I>val create </I>
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:
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<B>int -> t</B>
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<P>
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<P>
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<B>create n</B>
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returns a fresh buffer, initially empty.
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The
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<B>n</B>
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parameter is the initial size of the internal byte sequence
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that holds the buffer contents. That byte sequence is automatically
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reallocated when more than
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<B>n</B>
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characters are stored in the buffer,
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but shrinks back to
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<B>n</B>
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characters when
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<B>reset</B>
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is called.
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For best performance,
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<B>n</B>
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should be of the same order of magnitude
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as the number of characters that are expected to be stored in
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the buffer (for instance, 80 for a buffer that holds one output
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line). Nothing bad will happen if the buffer grows beyond that
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limit, however. In doubt, take
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<B>n = 16</B>
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for instance.
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If
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<B>n</B>
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is not between 1 and
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<B>Sys.max_string_length</B>
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, it will
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be clipped to that interval.
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<P>
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<P>
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<P>
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<I>val contents </I>
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:
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<B>t -> string</B>
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<P>
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Return a copy of the current contents of the buffer.
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The buffer itself is unchanged.
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<P>
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<P>
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<P>
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<I>val to_bytes </I>
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:
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<B>t -> bytes</B>
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<P>
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Return a copy of the current contents of the buffer.
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The buffer itself is unchanged.
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<P>
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<P>
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<B>Since</B>
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4.02
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<P>
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<P>
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<P>
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<I>val sub </I>
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:
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<B>t -> int -> int -> string</B>
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<P>
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<P>
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<B>Buffer.sub b off len</B>
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returns a copy of
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<B>len</B>
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bytes from the
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current contents of the buffer
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<B>b</B>
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, starting at offset
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<B>off</B>
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.
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<P>
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Raise
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<B>Invalid_argument</B>
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if
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<B>srcoff</B>
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and
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<B>len</B>
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do not designate a valid
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range of
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<B>b</B>
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.
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<P>
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<P>
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<P>
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<I>val blit </I>
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:
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<B>t -> int -> bytes -> int -> int -> unit</B>
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<P>
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<P>
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<B>Buffer.blit src srcoff dst dstoff len</B>
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copies
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<B>len</B>
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characters from
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the current contents of the buffer
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<B>src</B>
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, starting at offset
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<B>srcoff</B>
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to
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<B>dst</B>
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, starting at character
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<B>dstoff</B>
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.
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<P>
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Raise
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<B>Invalid_argument</B>
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if
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<B>srcoff</B>
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and
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<B>len</B>
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do not designate a valid
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range of
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<B>src</B>
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, or if
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<B>dstoff</B>
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and
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<B>len</B>
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do not designate a valid
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range of
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<B>dst</B>
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.
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<P>
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<P>
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<B>Since</B>
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3.11.2
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<P>
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<P>
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<P>
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<I>val nth </I>
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:
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<B>t -> int -> char</B>
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<P>
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Get the n-th character of the buffer. Raise
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<B>Invalid_argument</B>
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if
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index out of bounds
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<P>
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<P>
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<P>
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<I>val length </I>
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:
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<B>t -> int</B>
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<P>
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Return the number of characters currently contained in the buffer.
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<P>
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<P>
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<P>
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<I>val clear </I>
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:
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<B>t -> unit</B>
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<P>
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Empty the buffer.
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<P>
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<P>
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<P>
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<I>val reset </I>
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:
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<B>t -> unit</B>
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<P>
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Empty the buffer and deallocate the internal byte sequence holding the
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buffer contents, replacing it with the initial internal byte sequence
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of length
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<B>n</B>
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that was allocated by
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<B>Buffer.create</B>
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<B>n</B>
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.
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For long-lived buffers that may have grown a lot,
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<B>reset</B>
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allows
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faster reclamation of the space used by the buffer.
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<P>
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<P>
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<P>
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<I>val add_char </I>
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:
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<B>t -> char -> unit</B>
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<P>
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<P>
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<B>add_char b c</B>
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appends the character
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<B>c</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<P>
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<I>val add_utf_8_uchar </I>
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:
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<B>t -> Uchar.t -> unit</B>
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<P>
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<P>
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<B>add_utf_8_uchar b u</B>
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appends the
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UTF-8 encoding of
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<B>u</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<B>Since</B>
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4.06.0
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<P>
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<P>
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<P>
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<I>val add_utf_16le_uchar </I>
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:
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<B>t -> Uchar.t -> unit</B>
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<P>
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<P>
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<B>add_utf_16le_uchar b u</B>
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appends the
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UTF-16LE encoding of
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<B>u</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<B>Since</B>
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4.06.0
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<P>
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<P>
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<P>
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<I>val add_utf_16be_uchar </I>
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:
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<B>t -> Uchar.t -> unit</B>
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<P>
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<P>
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<B>add_utf_16be_uchar b u</B>
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appends the
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UTF-16BE encoding of
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<B>u</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<B>Since</B>
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4.06.0
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<P>
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<P>
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<P>
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<I>val add_string </I>
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:
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<B>t -> string -> unit</B>
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<P>
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<P>
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<B>add_string b s</B>
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appends the string
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<B>s</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<P>
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<I>val add_bytes </I>
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:
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<B>t -> bytes -> unit</B>
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<P>
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<P>
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<B>add_bytes b s</B>
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appends the byte sequence
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<B>s</B>
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at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<B>Since</B>
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4.02
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<P>
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<P>
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<P>
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<I>val add_substring </I>
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:
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<B>t -> string -> int -> int -> unit</B>
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<P>
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<P>
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<B>add_substring b s ofs len</B>
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takes
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<B>len</B>
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characters from offset
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<B>ofs</B>
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in string
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<B>s</B>
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and appends them at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<P>
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<I>val add_subbytes </I>
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:
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<B>t -> bytes -> int -> int -> unit</B>
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<P>
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<P>
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<B>add_subbytes b s ofs len</B>
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takes
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<B>len</B>
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characters from offset
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<B>ofs</B>
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in byte sequence
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<B>s</B>
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and appends them at the end of buffer
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<B>b</B>
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.
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<P>
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<P>
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<B>Since</B>
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4.02
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<P>
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<P>
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<P>
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<I>val add_substitute </I>
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:
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<B>t -> (string -> string) -> string -> unit</B>
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<P>
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<P>
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<B>add_substitute b f s</B>
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appends the string pattern
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<B>s</B>
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at the end
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of buffer
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<B>b</B>
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with substitution.
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The substitution process looks for variables into
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the pattern and substitutes each variable name by its value, as
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obtained by applying the mapping
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<B>f</B>
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to the variable name. Inside the
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string pattern, a variable name immediately follows a non-escaped
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<B>$</B>
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character and is one of the following:
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<P>
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-a non empty sequence of alphanumeric or
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<B>_</B>
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characters,
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<P>
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-an arbitrary sequence of characters enclosed by a pair of
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matching parentheses or curly brackets.
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An escaped
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<B>$</B>
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character is a
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<B>$</B>
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that immediately follows a backslash
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character; it then stands for a plain
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<B>$</B>
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.
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Raise
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<B>Not_found</B>
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if the closing character of a parenthesized variable
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cannot be found.
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<P>
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<P>
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<P>
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<P>
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<I>val add_buffer </I>
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:
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<B>t -> t -> unit</B>
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<P>
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<P>
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<B>add_buffer b1 b2</B>
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appends the current contents of buffer
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<B>b2</B>
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at the end of buffer
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<B>b1</B>
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.
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<B>b2</B>
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is not modified.
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<P>
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<P>
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<P>
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<I>val add_channel </I>
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:
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<B>t -> in_channel -> int -> unit</B>
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<P>
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<P>
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<B>add_channel b ic n</B>
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reads at most
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<B>n</B>
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characters from the
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input channel
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<B>ic</B>
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and stores them at the end of buffer
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<B>b</B>
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.
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Raise
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<B>End_of_file</B>
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if the channel contains fewer than
|
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<B>n</B>
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characters. In this case, the characters are still added to
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the buffer, so as to avoid loss of data.
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<P>
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<P>
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<P>
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<I>val output_buffer </I>
|
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:
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<B>out_channel -> t -> unit</B>
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|
|
<P>
|
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<P>
|
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<B>output_buffer oc b</B>
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|
writes the current contents of buffer
|
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<B>b</B>
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on the output channel
|
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<B>oc</B>
|
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.
|
|
<P>
|
|
<P>
|
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<P>
|
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<I>val truncate </I>
|
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|
|
:
|
|
<B>t -> int -> unit</B>
|
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|
|
<P>
|
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<P>
|
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<B>truncate b len</B>
|
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|
|
truncates the length of
|
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<B>b</B>
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to
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<B>len</B>
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|
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Note: the internal byte sequence is not shortened.
|
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Raise
|
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<B>Invalid_argument</B>
|
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|
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if
|
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<B>len < 0</B>
|
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|
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or
|
|
<B>len > length b</B>
|
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|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.05.0
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<P>
|
|
|
|
<A NAME="lbAE"> </A>
|
|
<H3>Iterators</H3>
|
|
|
|
<P>
|
|
<P>
|
|
|
|
<P>
|
|
<I>val to_seq </I>
|
|
|
|
:
|
|
<B>t -> char Seq.t</B>
|
|
|
|
<P>
|
|
Iterate on the buffer, in increasing order.
|
|
Modification of the buffer during iteration is undefined behavior.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.07
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val to_seqi </I>
|
|
|
|
:
|
|
<B>t -> (int * char) Seq.t</B>
|
|
|
|
<P>
|
|
Iterate on the buffer, in increasing order, yielding indices along chars.
|
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Modification of the buffer during iteration is undefined behavior.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.07
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_seq </I>
|
|
|
|
:
|
|
<B>t -> char Seq.t -> unit</B>
|
|
|
|
<P>
|
|
Add chars to the buffer
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.07
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val of_seq </I>
|
|
|
|
:
|
|
<B>char Seq.t -> t</B>
|
|
|
|
<P>
|
|
Create a buffer from the generator
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.07
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<P>
|
|
|
|
<A NAME="lbAF"> </A>
|
|
<H3>Binary encoding of integers</H3>
|
|
|
|
<P>
|
|
<P>
|
|
|
|
<P>
|
|
<P>
|
|
|
|
The functions in this section append binary encodings of integers
|
|
to buffers.
|
|
<P>
|
|
Little-endian (resp. big-endian) encoding means that least
|
|
(resp. most) significant bytes are stored first. Big-endian is
|
|
also known as network byte order. Native-endian encoding is
|
|
either little-endian or big-endian depending on
|
|
<B>Sys.big_endian</B>
|
|
|
|
.
|
|
<P>
|
|
32-bit and 64-bit integers are represented by the
|
|
<B>int32</B>
|
|
|
|
and
|
|
<B>int64</B>
|
|
|
|
types, which can be interpreted either as signed or
|
|
unsigned numbers.
|
|
<P>
|
|
8-bit and 16-bit integers are represented by the
|
|
<B>int</B>
|
|
|
|
type,
|
|
which has more bits than the binary encoding. Functions that
|
|
encode these values truncate their inputs to their least
|
|
significant bytes.
|
|
<P>
|
|
|
|
<P>
|
|
<I>val add_uint8 </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_uint8 b i</B>
|
|
|
|
appends a binary unsigned 8-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int8 </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int8 b i</B>
|
|
|
|
appends a binary signed 8-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_uint16_ne </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_uint16_ne b i</B>
|
|
|
|
appends a binary native-endian unsigned 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_uint16_be </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_uint16_be b i</B>
|
|
|
|
appends a binary big-endian unsigned 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_uint16_le </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_uint16_le b i</B>
|
|
|
|
appends a binary little-endian unsigned 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int16_ne </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int16_ne b i</B>
|
|
|
|
appends a binary native-endian signed 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int16_be </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int16_be b i</B>
|
|
|
|
appends a binary big-endian signed 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int16_le </I>
|
|
|
|
:
|
|
<B>t -> int -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int16_le b i</B>
|
|
|
|
appends a binary little-endian signed 16-bit
|
|
integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int32_ne </I>
|
|
|
|
:
|
|
<B>t -> int32 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int32_ne b i</B>
|
|
|
|
appends a binary native-endian 32-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int32_be </I>
|
|
|
|
:
|
|
<B>t -> int32 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int32_be b i</B>
|
|
|
|
appends a binary big-endian 32-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int32_le </I>
|
|
|
|
:
|
|
<B>t -> int32 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int32_le b i</B>
|
|
|
|
appends a binary little-endian 32-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int64_ne </I>
|
|
|
|
:
|
|
<B>t -> int64 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int64_ne b i</B>
|
|
|
|
appends a binary native-endian 64-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int64_be </I>
|
|
|
|
:
|
|
<B>t -> int64 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int64_be b i</B>
|
|
|
|
appends a binary big-endian 64-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
<I>val add_int64_le </I>
|
|
|
|
:
|
|
<B>t -> int64 -> unit</B>
|
|
|
|
<P>
|
|
<P>
|
|
<B>add_int64_ne b i</B>
|
|
|
|
appends a binary little-endian 64-bit integer
|
|
<B>i</B>
|
|
|
|
to
|
|
<B>b</B>
|
|
|
|
.
|
|
<P>
|
|
<P>
|
|
<B>Since</B>
|
|
|
|
4.08
|
|
<P>
|
|
<P>
|
|
<P>
|
|
|
|
<HR>
|
|
<A NAME="index"> </A><H2>Index</H2>
|
|
<DL>
|
|
<DT id="1"><A HREF="#lbAB">NAME</A><DD>
|
|
<DT id="2"><A HREF="#lbAC">Module</A><DD>
|
|
<DT id="3"><A HREF="#lbAD">Documentation</A><DD>
|
|
<DL>
|
|
<DT id="4"><A HREF="#lbAE">Iterators</A><DD>
|
|
<DT id="5"><A HREF="#lbAF">Binary encoding of integers</A><DD>
|
|
</DL>
|
|
</DL>
|
|
<HR>
|
|
This document was created by
|
|
<A HREF="/cgi-bin/man/man2html">man2html</A>,
|
|
using the manual pages.<BR>
|
|
Time: 00:05:36 GMT, March 31, 2021
|
|
</BODY>
|
|
</HTML>
|