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