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