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Cause PQescapeString to stop processing at a null character, rather

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than generating an invalid output string.  Per observation and patch
from Igor Shevchenko.  Further code cleanup and documentation by
Tom Lane.
This commit is contained in:
Tom Lane
2003-10-03 18:26:14 +00:00
parent 3b4c142030
commit 251033186f
2 changed files with 29 additions and 26 deletions
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13
doc/src/sgml/libpq.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.137 2003/09/20 20:12:05 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/libpq.sgml,v 1.138 2003/10/03 18:26:14 tgl Exp $
-->
<chapter id="libpq">
@ -1972,10 +1972,13 @@ size_t PQescapeString (char *to, const char *from, size_t length);
<para>
The parameter <parameter>from</> points to the first character of the string
that
is to be escaped, and the <parameter>length</> parameter gives the
number of characters in this string. (A terminating zero byte is
neither necessary nor counted.) <parameter>to</> shall point to a
that is to be escaped, and the <parameter>length</> parameter gives the
number of characters in this string. A terminating zero byte is not
required, and should not be counted in <parameter>length</>. (If
a terminating zero byte is found before <parameter>length</> bytes are
processed, <function>PQescapeString</> stops at the zero; the behavior
is thus rather like <function>strncpy</>.)
<parameter>to</> shall point to a
buffer that is able to hold at least one more character than twice
the value of <parameter>length</>, otherwise the behavior is
undefined. A call to <function>PQescapeString</> writes an escaped