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-Content-type: text/html
-
-<HTML><HEAD><TITLE>Manpage of IPSEC_ATOUL</TITLE>
-</HEAD><BODY>
-<H1>IPSEC_ATOUL</H1>
-Section: C Library Functions (3)<BR>Updated: 11 June 2001<BR><A HREF="#index">Index</A>
-<A HREF="http://localhost/cgi-bin/man/man2html">Return to Main Contents</A><HR>
-
-
-<A NAME="lbAB">&nbsp;</A>
-<H2>NAME</H2>
-
-ipsec atoul, ultoa - convert unsigned-long numbers to and from ASCII
-<A NAME="lbAC">&nbsp;</A>
-<H2>SYNOPSIS</H2>
-
-<B>#include &lt;<A HREF="file:/usr/include/freeswan.h">freeswan.h</A>&gt;</B>
-
-<P>
-<B>const char *atoul(const char *src, size_t srclen,</B>
-
-<BR>
-&nbsp;
-<B>int base, unsigned long *n);</B>
-
-<BR>
-
-<B>size_t ultoa(unsigned long n, int base, char *dst,</B>
-
-<BR>
-&nbsp;
-<B>size_t dstlen);</B>
-
-<A NAME="lbAD">&nbsp;</A>
-<H2>DESCRIPTION</H2>
-
-These functions are obsolete; see
-<I><A HREF="ipsec_ttoul.3.html">ipsec_ttoul</A></I>(3)
-
-for their replacements.
-<P>
-
-<I>Atoul</I>
-
-converts an ASCII number into a binary
-<B>unsigned long</B>
-
-value.
-<I>Ultoa</I>
-
-does the reverse conversion, back to an ASCII version.
-<P>
-
-Numbers are specified in ASCII as
-decimal (e.g.
-<B>123</B>),
-
-octal with a leading zero (e.g.
-<B>012</B>,
-
-which has value 10),
-or hexadecimal with a leading
-<B>0x</B>
-
-(e.g.
-<B>0x1f</B>,
-
-which has value 31)
-in either upper or lower case.
-<P>
-
-The
-<I>srclen</I>
-
-parameter of
-<I>atoul</I>
-
-specifies the length of the ASCII string pointed to by
-<I>src</I>;
-
-it is an error for there to be anything else
-(e.g., a terminating NUL) within that length.
-As a convenience for cases where an entire NUL-terminated string is
-to be converted,
-a
-<I>srclen</I>
-
-value of
-<B>0</B>
-
-is taken to mean
-<B>strlen(src)</B>.
-
-<P>
-
-The
-<I>base</I>
-
-parameter of
-<I>atoul</I>
-
-can be
-<B>8</B>,
-
-<B>10</B>,
-
-or
-<B>16</B>,
-
-in which case the number supplied is assumed to be of that form
-(and in the case of
-<B>16</B>,
-
-to lack any
-<B>0x</B>
-
-prefix).
-It can also be
-<B>0</B>,
-
-in which case the number is examined for a leading zero
-or a leading
-<B>0x</B>
-
-to determine its base,
-or
-<B>13</B>
-
-(halfway between 10 and 16),
-which has the same effect as
-<B>0</B>
-
-except that a non-hexadecimal
-number is considered decimal regardless of any leading zero.
-<P>
-
-The
-<I>dstlen</I>
-
-parameter of
-<I>ultoa</I>
-
-specifies the size of the
-<I>dst</I>
-
-parameter;
-under no circumstances are more than
-<I>dstlen</I>
-
-bytes written to
-<I>dst</I>.
-
-A result which will not fit is truncated.
-<I>Dstlen</I>
-
-can be zero, in which case
-<I>dst</I>
-
-need not be valid and no result is written,
-but the return value is unaffected;
-in all other cases, the (possibly truncated) result is NUL-terminated.
-<P>
-
-The
-<I>base</I>
-
-parameter of
-<I>ultoa</I>
-
-must be
-<B>8</B>,
-
-<B>10</B>,
-
-or
-<B>16</B>.
-
-<P>
-
-<I>Atoul</I>
-
-returns NULL for success and
-a pointer to a string-literal error message for failure;
-see DIAGNOSTICS.
-<I>Ultoa</I>
-
-returns the size of buffer which would
-be needed to
-accommodate the full conversion result, including terminating NUL;
-it is the caller's responsibility to check this against the size of
-the provided buffer to determine whether truncation has occurred.
-<A NAME="lbAE">&nbsp;</A>
-<H2>SEE ALSO</H2>
-
-<A HREF="atol.3.html">atol</A>(3), <A HREF="strtoul.3.html">strtoul</A>(3)
-<A NAME="lbAF">&nbsp;</A>
-<H2>DIAGNOSTICS</H2>
-
-Fatal errors in
-<I>atoul</I>
-
-are:
-empty input;
-unknown
-<I>base</I>;
-
-non-digit character found;
-number too large for an
-<B>unsigned long</B>.
-
-<A NAME="lbAG">&nbsp;</A>
-<H2>HISTORY</H2>
-
-Written for the FreeS/WAN project by Henry Spencer.
-<A NAME="lbAH">&nbsp;</A>
-<H2>BUGS</H2>
-
-There is no provision for reporting an invalid
-<I>base</I>
-
-parameter given to
-<I>ultoa</I>.
-
-<P>
-
-The restriction of error reports to literal strings
-(so that callers don't need to worry about freeing them or copying them)
-does limit the precision of error reporting.
-<P>
-
-The error-reporting convention lends itself to slightly obscure code,
-because many readers will not think of NULL as signifying success.
-A good way to make it clearer is to write something like:
-<P>
-
-<DL COMPACT><DT><DD>
-<PRE>
-<B>const char *error;</B>
-
-<B>error = atoul( /* ... */ );</B>
-<B>if (error != NULL) {</B>
-<B> /* something went wrong */</B>
-</PRE>
-
-</DL>
-
-<P>
-
-<HR>
-<A NAME="index">&nbsp;</A><H2>Index</H2>
-<DL>
-<DT><A HREF="#lbAB">NAME</A><DD>
-<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
-<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
-<DT><A HREF="#lbAE">SEE ALSO</A><DD>
-<DT><A HREF="#lbAF">DIAGNOSTICS</A><DD>
-<DT><A HREF="#lbAG">HISTORY</A><DD>
-<DT><A HREF="#lbAH">BUGS</A><DD>
-</DL>
-<HR>
-This document was created by
-<A HREF="http://localhost/cgi-bin/man/man2html">man2html</A>,
-using the manual pages.<BR>
-Time: 21:40:18 GMT, November 11, 2003
-</BODY>
-</HTML>