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Add info on building dynamic strings for logging. 

Reorder some points for a more logical organization.
This commit is contained in:
Dimitrie O. Paun 2005-02-24 10:07:58 +00:00 committed by Alexandre Julliard
parent af812605fb
commit 7df9002767
1 changed files with 34 additions and 5 deletions
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39
documentation/debugging.sgml
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@ -427,6 +427,14 @@ TRACE("(%d, %p, ...)\n", par1, par2, ...);
</programlisting>
</para>
</listitem>
<listitem>
<para>
if you want to name a parameter, use <literal>=</literal> :
<programlisting>
TRACE("(fd=%d, file=%s): stub\n", fd, name);
</programlisting>
</para>
</listitem>
<listitem>
<para>
for stubs, you should output a <literal>FIXME</literal>
@ -440,16 +448,37 @@ FIXME("(%x, %d, ...): stub\n", par1, par2, ...);
<para>
try to output one line per message. That is, the format
string should contain only one <literal>\n</literal> and it
should always appear at the end of the string. (there are
many reasons for this requirement, one of them is that
each debug macro adds things to the beginning of the line)
should always appear at the end of the string.
</para>
</listitem>
<listitem>
<para>
if you want to name a parameter, use <literal>=</literal> :
if the output string needs to be dynamically constructed,
render it in memory before outputting it:
<programlisting>
FIXME("(fd=%d, file=%s): stub\n", fd, name);
char buffer[128] = "";
if (flags & FLAG_A) strcat(buffer, "FLAG_A ");
if (flags & FLAG_B) strcat(buffer, "FLAG_B ");
if (flags & FLAG_C) strcat(buffer, "FLAG_C ");
TRACE("flags = %s\n", buffer);
</programlisting>
Most of the time however, it is better to create a helper
function that renders to a temporary buffer:
<programlisting>
static const char *dbgstr_flags(int flags)
{
char buffer[128] = "";
if (flags & FLAG_A) strcat(buffer, "FLAG_A ");
if (flags & FLAG_B) strcat(buffer, "FLAG_B ");
if (flags & FLAG_C) strcat(buffer, "FLAG_C ");
return wine_dbg_sprintf("flags = %s\n\n", buffer);
}
...
TRACE("flags = %s\n", dbgstr_flags(flags));
</programlisting>
</para>
</listitem>