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ladspa-sink: fix search path

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Having a single level macro for stringizing LADSPA_PATH doesn't work,
because the '#' preprocessor operator doesn't expand any macros in its
parameter. As a result, we used the string "LADSPA_PATH" as the search
path, and obviously no plugins were ever found.

This adds a two-level macro in macro.h and uses that to expand and
stringize LADSPA_PATH.

Bug link: https://bugs.freedesktop.org/show_bug.cgi?id=107078
This commit is contained in:
Tanu Kaskinen 2018-07-04 14:25:26 +03:00
parent c4efbc81b0
commit 1b377d4428
2 changed files with 12 additions and 8 deletions
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14
src/modules/module-ladspa-sink.c
View file

@ -1054,15 +1054,13 @@ int pa__init(pa_module*m) {
u->output = NULL;
u->ss = ss;
/* If the LADSPA_PATH environment variable is not set, we use the
* LADSPA_PATH preprocessor macro instead. The macro can contain characters
* that need to be escaped (especially on Windows backslashes are common).
* The "#" preprocessor operator helpfully adds the required escaping while
* turning the LADSPA_PATH macro into a string. */
#define QUOTE_MACRO(x) #x
if (!(e = getenv("LADSPA_PATH")))
e = QUOTE_MACRO(LADSPA_PATH);
#undef QUOTE_MACRO
/* The LADSPA_PATH preprocessor macro isn't a string literal (i.e. it
* doesn't contain quotes), because otherwise the build system would
* have an extra burden of getting the escaping right (Windows paths
* are especially tricky). PA_EXPAND_AND_STRINGIZE does the necessary
* escaping. */
e = PA_EXPAND_AND_STRINGIZE(LADSPA_PATH);
/* FIXME: This is not exactly thread safe */
t = pa_xstrdup(lt_dlgetsearchpath());

6
src/pulsecore/macro.h
View file

@ -298,6 +298,12 @@ static inline size_t PA_ALIGN(size_t l) {
? (-1 - PA_INT_TYPE_MAX(type)) \
: (type) 0))
/* The '#' preprocessor operator doesn't expand any macros that are in the
* parameter, which is why we need a separate macro for those cases where the
* parameter contains a macro that needs expanding. */
#define PA_STRINGIZE(x) #x
#define PA_EXPAND_AND_STRINGIZE(x) PA_STRINGIZE(x)
/* We include this at the very last place */
#include <pulsecore/log.h>