snd_dlopen: do not use absolute plugin path for snd_dlopen() calls

In commit b906db1, the snd_dlopen()
implements the automatic lookup to the ALSA_PLUGIN_DIR directory.
It is not necessary to add the absolute paths in callers now.

The plugin names are also searched in ld.so.conf paths as the fallback now,
but it should not be a big problem.

BugLink: #34
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

modules/mixer/simple/sbasedl.c

@@ -33,7 +33,7 @@
 #include "mixer_abst.h"
 #include "sbase.h"
 
-#define SO_PATH ALSA_PLUGIN_DIR "/smixer"
+#define SO_PATH "smixer"
 
 int mixer_simple_basic_dlopen(snd_mixer_class_t *class,
 			      bclass_base_ops_t **ops)

src/control/control.c

@@ -1337,13 +1337,13 @@ static int snd_ctl_open_conf(snd_ctl_t **ctlp, const char *name,
 			build_in++;
 		}
 		if (*build_in == NULL) {
-			buf1 = malloc(strlen(str) + sizeof(ALSA_PLUGIN_DIR) + 32);
+			buf1 = malloc(strlen(str) + 32);
 			if (buf1 == NULL) {
 				err = -ENOMEM;
 				goto _err;
 			}
 			lib = buf1;
-			sprintf(buf1, "%s/libasound_module_ctl_%s.so", ALSA_PLUGIN_DIR, str);
+			sprintf(buf1, "libasound_module_ctl_%s.so", str);
 		}
 	}
 #ifndef PIC

src/mixer/simple_abst.c

@@ -40,7 +40,7 @@
 
 #ifndef DOC_HIDDEN
 
-#define SO_PATH ALSA_PLUGIN_DIR "/smixer"
+#define SO_PATH "smixer"
 
 typedef struct _class_priv {
 	char *device;

src/pcm/pcm.c

@@ -2578,13 +2578,13 @@ static int snd_pcm_open_conf(snd_pcm_t **pcmp, const char *name,
 			build_in++;
 		}
 		if (*build_in == NULL) {
-			buf1 = malloc(strlen(str) + sizeof(ALSA_PLUGIN_DIR) + 32);
+			buf1 = malloc(strlen(str) + 32);
 			if (buf1 == NULL) {
 				err = -ENOMEM;
 				goto _err;
 			}
 			lib = buf1;
-			sprintf(buf1, "%s/libasound_module_pcm_%s.so", ALSA_PLUGIN_DIR, str);
+			sprintf(buf1, "libasound_module_pcm_%s.so", str);
 		}
 	}
 #ifndef PIC

src/pcm/pcm_rate.c

@@ -1281,7 +1281,7 @@ static const char *const default_rate_plugins[] = {
 
 static int rate_open_func(snd_pcm_rate_t *rate, const char *type, const snd_config_t *converter_conf, int verbose)
 {
-	char open_name[64], open_conf_name[64], lib_name[128], *lib = NULL;
+	char open_name[64], open_conf_name[64], lib_name[64], *lib = NULL;
 	snd_pcm_rate_open_func_t open_func;
 	snd_pcm_rate_open_conf_func_t open_conf_func;
 	int err;
@@ -1290,7 +1290,7 @@ static int rate_open_func(snd_pcm_rate_t *rate, const char *type, const snd_conf
 	snprintf(open_conf_name, sizeof(open_conf_name), "_snd_pcm_rate_%s_open_conf", type);
 	if (!is_builtin_plugin(type)) {
 		snprintf(lib_name, sizeof(lib_name),
-				 "%s/libasound_module_rate_%s.so", ALSA_PLUGIN_DIR, type);
+				 "libasound_module_rate_%s.so", type);
 		lib = lib_name;
 	}