added ladspa, doesn't have checks yet though

Original commit message from CVS:
added ladspa, doesn't have checks yet though

1 files changed, 129 insertions, 0 deletions

diff --git a/ext/ladspa/search.c b/ext/ladspa/search.c
new file mode 100644
index 00000000..31940474
--- /dev/null
+++ b/ext/ladspa/search.c
@@ -0,0 +1,129 @@
+/* search.c
+
+   Free software by Richard W.E. Furse. Do with as you will. No
+   warranty. */
+
+/*****************************************************************************/
+
+#include <dirent.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/*****************************************************************************/
+
+#include "ladspa.h"
+#include "utils.h"
+
+/*****************************************************************************/
+
+/* Search just the one directory. */
+static void
+LADSPADirectoryPluginSearch
+(const char * pcDirectory, 
+ LADSPAPluginSearchCallbackFunction fCallbackFunction) {
+
+  char * pcFilename;
+  DIR * psDirectory;
+  LADSPA_Descriptor_Function fDescriptorFunction;
+  long lDirLength;
+  long iNeedSlash;
+  struct dirent * psDirectoryEntry;
+  void * pvPluginHandle;
+
+  lDirLength = strlen(pcDirectory);
+  if (!lDirLength)
+    return;
+  if (pcDirectory[lDirLength - 1] == '/')
+    iNeedSlash = 0;
+  else
+    iNeedSlash = 1;
+
+  psDirectory = opendir(pcDirectory);
+  if (!psDirectory)
+    return;
+
+  while (1) {
+
+    psDirectoryEntry = readdir(psDirectory);
+    if (!psDirectoryEntry) {
+      closedir(psDirectory);
+      return;
+    }
+
+    pcFilename = malloc(lDirLength
+			+ strlen(psDirectoryEntry->d_name)
+			+ 1 + iNeedSlash);
+    strcpy(pcFilename, pcDirectory);
+    if (iNeedSlash)
+      strcat(pcFilename, "/");
+    strcat(pcFilename, psDirectoryEntry->d_name);
+    
+    pvPluginHandle = dlopen(pcFilename, RTLD_LAZY);
+    if (pvPluginHandle) {
+      /* This is a file and the file is a shared library! */
+
+      dlerror();
+      fDescriptorFunction
+	= (LADSPA_Descriptor_Function)dlsym(pvPluginHandle,
+					    "ladspa_descriptor");
+      if (dlerror() == NULL && fDescriptorFunction) {
+	/* We've successfully found a ladspa_descriptor function. Pass
+           it to the callback function. */
+	fCallbackFunction(pcFilename,
+			  pvPluginHandle,
+			  fDescriptorFunction);
+      }
+      else {
+	/* It was a library, but not a LADSPA one. Unload it. */
+	dlclose(pcFilename);
+      }
+    }
+    free(pcFilename);
+  }
+}
+
+/*****************************************************************************/
+
+void 
+LADSPAPluginSearch(LADSPAPluginSearchCallbackFunction fCallbackFunction) {
+
+  char * pcBuffer;
+  const char * pcEnd;
+  const char * pcLADSPAPath;
+  const char * pcStart;
+
+  pcLADSPAPath = getenv("LADSPA_PATH");
+  if (!pcLADSPAPath) {
+//    fprintf(stderr,
+//	    "Warning: You do not have a LADSPA_PATH "
+//	    "environment variable set.\n");
+    return;
+  }
+  
+  pcStart = pcLADSPAPath;
+  while (*pcStart != '\0') {
+    pcEnd = pcStart;
+    while (*pcEnd != ':' && *pcEnd != '\0')
+      pcEnd++;
+    
+    pcBuffer = malloc(1 + pcEnd - pcStart);
+    if (pcEnd > pcStart)
+      strncpy(pcBuffer, pcStart, pcEnd - pcStart);
+    pcBuffer[pcEnd - pcStart] = '\0';
+    
+    LADSPADirectoryPluginSearch(pcBuffer, fCallbackFunction);
+    free(pcBuffer);
+
+    pcStart = pcEnd;
+    if (*pcStart == ':')
+      pcStart++;
+  }
+}
+
+/*****************************************************************************/
+
+/* EOF */