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/* 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 */
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