rename hashset to hashmap

add module arguments parse in modargs.c
make module-pipe-sink use it


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@61 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/Makefile.am

@@ -75,7 +75,7 @@ polypaudio_SOURCES = idxset.c idxset.h \
 		mainloop-signal.c mainloop-signal.h \
 		mainloop-api.c mainloop-api.h \
 		util.c util.h \
-		hashset.c hashset.h \
+		hashmap.c hashmap.h \
 		namereg.c namereg.h \
 		sconv.c sconv.h \
 		resampler.c resampler.h \
@@ -83,7 +83,8 @@ polypaudio_SOURCES = idxset.c idxset.h \
 		memchunk.c memchunk.h \
 		sconv-s16le.c sconv-s16le.h \
 		sconv-s16be.c sconv-s16be.h \
-		sioman.c sioman.h
+		sioman.c sioman.h \
+		modargs.c modargs.h
 
 polypaudio_CFLAGS = $(AM_CFLAGS) $(LIBSAMPLERATE_CFLAGS)
 polypaudio_INCLUDES = $(INCLTDL)

src/core.h

@@ -2,7 +2,7 @@
 #define foocorehfoo
 
 #include "idxset.h"
-#include "hashset.h"
+#include "hashmap.h"
 #include "mainloop-api.h"
 
 struct pa_core {
@@ -10,7 +10,7 @@ struct pa_core {
 
     struct pa_idxset *clients, *sinks, *sources, *sink_inputs, *source_outputs, *modules;
 
-    struct pa_hashset *namereg;
+    struct pa_hashmap *namereg;
     
     uint32_t default_source_index, default_sink_index;
 };

src/hashmap.c

@@ -2,33 +2,33 @@
 #include <assert.h>
 #include <string.h>
 
-#include "hashset.h"
+#include "hashmap.h"
 #include "idxset.h"
 
-struct hashset_entry {
+struct hashmap_entry {
-    struct hashset_entry *next, *previous, *bucket_next, *bucket_previous;
+    struct hashmap_entry *next, *previous, *bucket_next, *bucket_previous;
     unsigned hash;
     const void *key;
     void *value;
 };
 
-struct pa_hashset {
+struct pa_hashmap {
     unsigned size;
-    struct hashset_entry **data;
+    struct hashmap_entry **data;
-    struct hashset_entry *first_entry;
+    struct hashmap_entry *first_entry;
     
     unsigned n_entries;
     unsigned (*hash_func) (const void *p);
     int (*compare_func) (const void*a, const void*b);
 };
 
-struct pa_hashset *pa_hashset_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b)) {
+struct pa_hashmap *pa_hashmap_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b)) {
-    struct pa_hashset *h;
+    struct pa_hashmap *h;
-    h = malloc(sizeof(struct pa_hashset));
+    h = malloc(sizeof(struct pa_hashmap));
     assert(h);
-    h->data = malloc(sizeof(struct hashset_entry*)*(h->size = 1023));
+    h->data = malloc(sizeof(struct hashmap_entry*)*(h->size = 1023));
     assert(h->data);
-    memset(h->data, 0, sizeof(struct hashset_entry*)*(h->size = 1023));
+    memset(h->data, 0, sizeof(struct hashmap_entry*)*(h->size = 1023));
     h->first_entry = NULL;
     h->n_entries = 0;
     h->hash_func = hash_func ? hash_func : pa_idxset_trivial_hash_func;
@@ -36,7 +36,7 @@ struct pa_hashset *pa_hashset_new(unsigned (*hash_func) (const void *p), int (*c
     return h;
 }
 
-static void remove(struct pa_hashset *h, struct hashset_entry *e) {
+static void remove(struct pa_hashmap *h, struct hashmap_entry *e) {
     assert(e);
 
     if (e->next)
@@ -57,7 +57,7 @@ static void remove(struct pa_hashset *h, struct hashset_entry *e) {
     h->n_entries--;
 }
 
-void pa_hashset_free(struct pa_hashset*h, void (*free_func)(void *p, void *userdata), void *userdata) {
+void pa_hashmap_free(struct pa_hashmap*h, void (*free_func)(void *p, void *userdata), void *userdata) {
     assert(h);
 
     while (h->first_entry) {
@@ -70,8 +70,8 @@ void pa_hashset_free(struct pa_hashset*h, void (*free_func)(void *p, void *userd
     free(h);
 }
 
-static struct hashset_entry *get(struct pa_hashset *h, unsigned hash, const void *key) {
+static struct hashmap_entry *get(struct pa_hashmap *h, unsigned hash, const void *key) {
-    struct hashset_entry *e;
+    struct hashmap_entry *e;
 
     for (e = h->data[hash]; e; e = e->bucket_next)
         if (h->compare_func(e->key, key) == 0)
@@ -80,8 +80,8 @@ static struct hashset_entry *get(struct pa_hashset *h, unsigned hash, const void
     return NULL;
 }
 
-int pa_hashset_put(struct pa_hashset *h, const void *key, void *value) {
+int pa_hashmap_put(struct pa_hashmap *h, const void *key, void *value) {
-    struct hashset_entry *e;
+    struct hashmap_entry *e;
     unsigned hash;
     assert(h && key);
 
@@ -90,7 +90,7 @@ int pa_hashset_put(struct pa_hashset *h, const void *key, void *value) {
     if ((e = get(h, hash, key)))
         return -1;
     
-    e = malloc(sizeof(struct hashset_entry));
+    e = malloc(sizeof(struct hashmap_entry));
     assert(e);
     
     e->hash = hash;
@@ -113,9 +113,9 @@ int pa_hashset_put(struct pa_hashset *h, const void *key, void *value) {
     return 0;
 }
 
-void* pa_hashset_get(struct pa_hashset *h, const void *key) {
+void* pa_hashmap_get(struct pa_hashmap *h, const void *key) {
     unsigned hash;
-    struct hashset_entry *e;
+    struct hashmap_entry *e;
     assert(h && key);
 
     hash = h->hash_func(key) % h->size;
@@ -126,8 +126,8 @@ void* pa_hashset_get(struct pa_hashset *h, const void *key) {
     return e->value;
 }
 
-int pa_hashset_remove(struct pa_hashset *h, const void *key) {
+int pa_hashmap_remove(struct pa_hashmap *h, const void *key) {
-    struct hashset_entry *e;
+    struct hashmap_entry *e;
     unsigned hash;
     assert(h && key);
 
@@ -140,6 +140,6 @@ int pa_hashset_remove(struct pa_hashset *h, const void *key) {
     return 0;
 }
 
-unsigned pa_hashset_ncontents(struct pa_hashset *h) {
+unsigned pa_hashmap_ncontents(struct pa_hashmap *h) {
     return h->n_entries;
 }

src/hashmap.h

@@ -0,0 +1,16 @@
+#ifndef foohashmaphfoo
+#define foohashmaphfoo
+
+struct pa_hashmap;
+
+struct pa_hashmap *pa_hashmap_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b));
+void pa_hashmap_free(struct pa_hashmap*, void (*free_func)(void *p, void *userdata), void *userdata);
+
+int pa_hashmap_put(struct pa_hashmap *h, const void *key, void *value);
+void* pa_hashmap_get(struct pa_hashmap *h, const void *key);
+
+int pa_hashmap_remove(struct pa_hashmap *h, const void *key);
+
+unsigned pa_hashmap_ncontents(struct pa_hashmap *h);
+
+#endif

src/hashset.h

@@ -1,16 +0,0 @@
-#ifndef foohashsethfoo
-#define foohashsethfoo
-
-struct pa_hashset;
-
-struct pa_hashset *pa_hashset_new(unsigned (*hash_func) (const void *p), int (*compare_func) (const void*a, const void*b));
-void pa_hashset_free(struct pa_hashset*, void (*free_func)(void *p, void *userdata), void *userdata);
-
-int pa_hashset_put(struct pa_hashset *h, const void *key, void *value);
-void* pa_hashset_get(struct pa_hashset *h, const void *key);
-
-int pa_hashset_remove(struct pa_hashset *h, const void *key);
-
-unsigned pa_hashset_ncontents(struct pa_hashset *h);
-
-#endif

src/modargs.c

@@ -0,0 +1,222 @@
+#include <ctype.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "hashmap.h"
+#include "modargs.h"
+#include "idxset.h"
+#include "sample-util.h"
+
+struct pa_modargs;
+
+struct entry {
+    char *key, *value;
+};
+
+static int add_key_value(struct pa_hashmap *map, char *key, char *value, const char* const* valid_keys) {
+    struct entry *e;
+    assert(map && key && value);
+
+    if (valid_keys) {
+        const char*const* v;
+        for (v = valid_keys; *v; v++)
+            if (strcmp(*v, key) == 0)
+                break;
+
+        if (!*v) {
+            free(key);
+            free(value);
+            return -1;
+        }
+    }
+    
+    e = malloc(sizeof(struct entry));
+    assert(e);
+    e->key = key;
+    e->value = value;
+    pa_hashmap_put(map, key, e);
+    return 0;
+}
+
+struct pa_modargs *pa_modargs_new(const char *args, const char* const* valid_keys) {
+    struct pa_hashmap *map = NULL;
+
+    map = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
+    assert(map);
+
+    if (args) {
+        enum { WHITESPACE, KEY, VALUE_START, VALUE_SIMPLE, VALUE_DOUBLE_QUOTES, VALUE_TICKS } state;
+        const char *p, *key, *value;
+        size_t key_len, value_len;
+        
+        key = value = NULL;
+        state = WHITESPACE;
+        for (p = args; *p; p++) {
+            switch (state) {
+                case WHITESPACE:
+                    if (*p == '=')
+                        goto fail;
+                    else if (!isspace(*p)) {
+                        key = p;
+                        state = KEY;
+                        key_len = 1;
+                    }
+                    break;
+                case KEY:
+                    if (*p == '=')
+                        state = VALUE_START;
+                    else
+                        key_len++;
+                    break;
+                case  VALUE_START:
+                    if (*p == '\'') {
+                        state = VALUE_TICKS;
+                        value = p+1;
+                        value_len = 0;
+                    } else if (*p == '"') {
+                        state = VALUE_DOUBLE_QUOTES;
+                        value = p+1;
+                        value_len = 0;
+                    } else if (isspace(*p)) {
+                        if (add_key_value(map, strndup(key, key_len), strdup(""), valid_keys) < 0)
+                            goto fail;
+                        state = WHITESPACE;
+                    } else {
+                        state = VALUE_SIMPLE;
+                        value = p;
+                        value_len = 1;
+                    }
+                    break;
+                case VALUE_SIMPLE:
+                    if (isspace(*p)) {
+                        if (add_key_value(map, strndup(key, key_len), strndup(value, value_len), valid_keys) < 0)
+                            goto fail;
+                        state = WHITESPACE;
+                    } else
+                        value_len++;
+                    break;
+                case VALUE_DOUBLE_QUOTES:
+                    if (*p == '"') {
+                        if (add_key_value(map, strndup(key, key_len), strndup(value, value_len), valid_keys) < 0)
+                            goto fail;
+                        state = WHITESPACE;
+                    } else
+                        value_len++;
+                    break;
+                case VALUE_TICKS:
+                    if (*p == '\'') {
+                        if (add_key_value(map, strndup(key, key_len), strndup(value, value_len), valid_keys) < 0)
+                            goto fail;
+                        state = WHITESPACE;
+                    } else
+                        value_len++;
+                    break;
+            }
+        }
+
+        if (state == VALUE_START) {
+            if (add_key_value(map, strndup(key, key_len), strdup(""), valid_keys) < 0)
+                goto fail;
+        } else if (state == VALUE_SIMPLE) {
+            if (add_key_value(map, strndup(key, key_len), strdup(value), valid_keys) < 0)
+                goto fail;
+        } else if (state != WHITESPACE)
+            goto fail;
+    }
+
+    return (struct pa_modargs*) map;
+
+fail:
+
+    if (map)
+        pa_modargs_free((struct pa_modargs*) map);
+                      
+    return NULL;
+}
+
+
+static void free_func(void *p, void*userdata) {
+    struct entry *e = p;
+    assert(e);
+    free(e->key);
+    free(e->value);
+    free(e);
+}
+
+void pa_modargs_free(struct pa_modargs*ma) {
+    struct pa_hashmap *map = (struct pa_hashmap*) ma;
+    pa_hashmap_free(map, free_func, NULL);
+}
+
+const char *pa_modargs_get_value(struct pa_modargs *ma, const char *key, const char *def) {
+    struct pa_hashmap *map = (struct pa_hashmap*) ma;
+    struct entry*e;
+
+    if (!(e = pa_hashmap_get(map, key)))
+        return def;
+
+    return e->value;
+}
+
+int pa_modargs_get_value_u32(struct pa_modargs *ma, const char *key, uint32_t *value) {
+    const char *v;
+    char *e;
+    unsigned long l;
+    assert(ma && key && value);
+
+    if (!(v = pa_modargs_get_value(ma, key, NULL)))
+        return 0;
+
+    if (!*v)
+        return -1;
+    
+    l = strtoul(v, &e, 0);
+    if (*e)
+        return -1;
+
+    *value = (uint32_t) l;
+    return 0;
+}
+
+int pa_modargs_get_sample_spec(struct pa_modargs *ma, struct pa_sample_spec *rss) {
+    const char *format;
+    uint32_t channels;
+    struct pa_sample_spec ss;
+    assert(ma && rss);
+
+    ss = pa_default_sample_spec;
+    if ((pa_modargs_get_value_u32(ma, "rate", &ss.rate)) < 0)
+        return -1;
+
+    channels = ss.channels;
+    if ((pa_modargs_get_value_u32(ma, "channels", &channels)) < 0)
+        return -1;
+    ss.channels = (uint8_t) channels;
+
+    if ((format = pa_modargs_get_value(ma, "format", NULL))) {
+        if (strcmp(format, "s16le") == 0)
+            ss.format = PA_SAMPLE_S16LE;
+        else if (strcmp(format, "s16be") == 0)
+            ss.format = PA_SAMPLE_S16BE;
+        else if (strcmp(format, "s16ne") == 0 || strcmp(format, "s16") == 0 || strcmp(format, "16") == 0)
+            ss.format = PA_SAMPLE_S16NE;
+        else if (strcmp(format, "u8") == 0 || strcmp(format, "8") == 0)
+            ss.format = PA_SAMPLE_U8;
+        else if (strcmp(format, "float32") == 0)
+            ss.format = PA_SAMPLE_FLOAT32;
+        else if (strcmp(format, "ulaw") == 0)
+            ss.format = PA_SAMPLE_ULAW;
+        else if (strcmp(format, "alaw") == 0)
+            ss.format = PA_SAMPLE_ALAW;
+        else
+            return -1;
+    }
+
+    if (!pa_sample_spec_valid(&ss))
+        return -1;
+
+    *rss = ss;
+    
+    return 0;
+}

src/modargs.h

@@ -0,0 +1,18 @@
+#ifndef foomodargshfoo
+#define foomodargshfoo
+
+#include <inttypes.h>
+#include "sample.h"
+
+struct pa_modargs;
+
+struct pa_modargs *pa_modargs_new(const char *args, const char* const* keys);
+void pa_modargs_free(struct pa_modargs*ma);
+
+const char *pa_modargs_get_value(struct pa_modargs *ma, const char *key, const char *def);
+int pa_modargs_get_value_u32(struct pa_modargs *ma, const char *key, uint32_t *value);
+
+int pa_modargs_get_sample_spec(struct pa_modargs *ma, struct pa_sample_spec *ss);
+
+
+#endif

src/module-pipe-sink.c

@@ -12,24 +12,37 @@
 #include "sink.h"
 #include "module.h"
 #include "util.h"
+#include "modargs.h"
+
+#define DEFAULT_FIFO_NAME "/tmp/musicfifo"
+#define DEFAULT_SINK_NAME "fifo_output"
 
 struct userdata {
+    struct pa_core *core;
+
     char *filename;
     
     struct pa_sink *sink;
     struct pa_iochannel *io;
-    struct pa_core *core;
     void *mainloop_source;
-    struct pa_mainloop_api *mainloop;
 
     struct pa_memchunk memchunk;
 };
 
+static const char* const valid_modargs[] = {
+    "file",
+    "rate",
+    "channels",
+    "format",
+    "sink",
+    NULL
+};
+
 static void do_write(struct userdata *u) {
     ssize_t r;
     assert(u);
 
-    u->mainloop->enable_fixed(u->mainloop, u->mainloop_source, 0);
+    u->core->mainloop->enable_fixed(u->core->mainloop, u->mainloop_source, 0);
         
     if (!pa_iochannel_is_writable(u->io))
         return;
@@ -59,7 +72,7 @@ static void notify_cb(struct pa_sink*s) {
     assert(s && u);
 
     if (pa_iochannel_is_writable(u->io))
-        u->mainloop->enable_fixed(u->mainloop, u->mainloop_source, 1);
+        u->core->mainloop->enable_fixed(u->core->mainloop, u->mainloop_source, 1);
 }
 
 static void fixed_callback(struct pa_mainloop_api *m, void *id, void *userdata) {
@@ -77,41 +90,51 @@ static void io_callback(struct pa_iochannel *io, void*userdata) {
 int pa_module_init(struct pa_core *c, struct pa_module*m) {
     struct userdata *u = NULL;
     struct stat st;
-    char *p;
+    const char *p;
     int fd = -1;
-    static const struct pa_sample_spec ss = {
+    struct pa_sample_spec ss;
-        .format = PA_SAMPLE_S16NE,
+    struct pa_modargs *ma = NULL;
-        .rate = 44100,
-        .channels = 2,
-    };
     assert(c && m);
     
-    mkfifo((p = m->argument ? m->argument : "/tmp/musicfifo"), 0777);
+    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
+        fprintf(stderr, __FILE__": failed to parse module arguments\n");
+        goto fail;
+    }
+
+    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
+        fprintf(stderr, __FILE__": invalid sample format specification\n");
+        goto fail;
+    }
+    
+    mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 
     if ((fd = open(p, O_RDWR)) < 0) {
-        fprintf(stderr, "open('%s'): %s\n", p, strerror(errno));
+        fprintf(stderr, __FILE__": open('%s'): %s\n", p, strerror(errno));
         goto fail;
     }
 
     if (fstat(fd, &st) < 0) {
-        fprintf(stderr, "fstat('%s'): %s\n", p, strerror(errno));
+        fprintf(stderr, __FILE__": fstat('%s'): %s\n", p, strerror(errno));
         goto fail;
     }
 
     if (!S_ISFIFO(st.st_mode)) {
-        fprintf(stderr, "'%s' is not a FIFO\n", p);
+        fprintf(stderr, __FILE__": '%s' is not a FIFO.\n", p);
         goto fail;
     }
 
-    
     u = malloc(sizeof(struct userdata));
     assert(u);
+    memset(u, 0, sizeof(struct userdata));
 
     u->filename = strdup(p);
     assert(u->filename);
     u->core = c;
-    u->sink = pa_sink_new(c, "fifo", 0, &ss);
+    
-    assert(u->sink);
+    if (!(u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink", DEFAULT_SINK_NAME), 0, &ss))) {
+        fprintf(stderr, __FILE__": failed to create sink.\n");
+        goto fail;
+    }
     u->sink->notify = notify_cb;
     u->sink->userdata = u;
     pa_sink_set_owner(u->sink, m);
@@ -125,19 +148,25 @@ int pa_module_init(struct pa_core *c, struct pa_module*m) {
     u->memchunk.memblock = NULL;
     u->memchunk.length = 0;
 
-    u->mainloop = c->mainloop;
+    u->mainloop_source = c->mainloop->source_fixed(c->mainloop, fixed_callback, u);
-    u->mainloop_source = u->mainloop->source_fixed(u->mainloop, fixed_callback, u);
     assert(u->mainloop_source);
-    u->mainloop->enable_fixed(u->mainloop, u->mainloop_source, 0);
+    c->mainloop->enable_fixed(c->mainloop, u->mainloop_source, 0);
         
     m->userdata = u;
 
+    pa_modargs_free(ma);
+    
     return 0;
 
 fail:
+    if (ma)
+        pa_modargs_free(ma);
+        
     if (fd >= 0)
         close(fd);
 
+    pa_module_done(c, m);
+
     return -1;
 }
 
@@ -145,15 +174,15 @@ void pa_module_done(struct pa_core *c, struct pa_module*m) {
     struct userdata *u;
     assert(c && m);
 
-    u = m->userdata;
+    if (!(u = m->userdata))
-    assert(u);
+        return;
     
     if (u->memchunk.memblock)
         pa_memblock_unref(u->memchunk.memblock);
         
     pa_sink_free(u->sink);
     pa_iochannel_free(u->io);
-    u->mainloop->cancel_fixed(u->mainloop, u->mainloop_source);
+    u->core->mainloop->cancel_fixed(u->core->mainloop, u->mainloop_source);
 
     assert(u->filename);
     unlink(u->filename);

src/namereg.c

@@ -17,8 +17,8 @@ void pa_namereg_free(struct pa_core *c) {
     assert(c);
     if (!c->namereg)
         return;
-    assert(pa_hashset_ncontents(c->namereg) == 0);
+    assert(pa_hashmap_ncontents(c->namereg) == 0);
-    pa_hashset_free(c->namereg, NULL, NULL);
+    pa_hashmap_free(c->namereg, NULL, NULL);
 }
 
 const char *pa_namereg_register(struct pa_core *c, const char *name, enum pa_namereg_type type, void *data, int fail) {
@@ -29,11 +29,11 @@ const char *pa_namereg_register(struct pa_core *c, const char *name, enum pa_nam
     assert(c && name && data);
 
     if (!c->namereg) {
-        c->namereg = pa_hashset_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
+        c->namereg = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
         assert(c->namereg);
     }
 
-    if ((e = pa_hashset_get(c->namereg, name)) && fail)
+    if ((e = pa_hashmap_get(c->namereg, name)) && fail)
         return NULL;
 
     if (!e)
@@ -47,7 +47,7 @@ const char *pa_namereg_register(struct pa_core *c, const char *name, enum pa_nam
         for (i = 1; i <= 99; i++) {
             snprintf(n, l+2, "%s%u", name, i);
 
-            if (!(e = pa_hashset_get(c->namereg, n)))
+            if (!(e = pa_hashmap_get(c->namereg, n)))
                 break;
         }
 
@@ -64,7 +64,7 @@ const char *pa_namereg_register(struct pa_core *c, const char *name, enum pa_nam
     e->name = n;
     e->data = data;
 
-    r = pa_hashset_put(c->namereg, e->name, e);
+    r = pa_hashmap_put(c->namereg, e->name, e);
     assert (r >= 0);
 
     return e->name;
@@ -76,10 +76,10 @@ void pa_namereg_unregister(struct pa_core *c, const char *name) {
     int r;
     assert(c && name);
 
-    e = pa_hashset_get(c->namereg, name);
+    e = pa_hashmap_get(c->namereg, name);
     assert(e);
 
-    r = pa_hashset_remove(c->namereg, name);
+    r = pa_hashmap_remove(c->namereg, name);
     assert(r >= 0);
 
     free(e->name);
@@ -93,7 +93,7 @@ void* pa_namereg_get(struct pa_core *c, const char *name, enum pa_namereg_type t
     void *d = NULL;
     assert(c && name);
 
-    if ((e = pa_hashset_get(c->namereg, name)))
+    if ((e = pa_hashmap_get(c->namereg, name)))
         if (e->type == e->type)
             return e->data;
 

src/todo

@@ -1,7 +1,9 @@
 - native library/protocol:
        more functions (esp. latency)
 
-- config parser/cmdline
+- make all modules use modargs.c
+- cmdline
+- daemonizing
 
 - move more stuff from module-oss[-dma] to liboss-util
 
@@ -13,6 +15,8 @@
 - svn-id and license in every file
 - documentation
 
+- eliminate global variables
+
 -- post 0.1
 - future cancellation
 - client-ui