attribute.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file attribute.c Attribute handling functions. */
   8 #include "para.h"
   9 #include "error.h"
  10 #include "afh.h"
  11 #include "afs.h"
  12 #include "string.h"
  13 #include "net.h"
  14
  15 static struct osl_table *attribute_table;
  16 static int greatest_att_bitnum;
  17
  18 /** The columns of the attribute table. */
  19 enum attribute_table_columns {
  20         /** The bit number (0-63). */
  21         ATTCOL_BITNUM,
  22         /** The name of the attribute. */
  23         ATTCOL_NAME,
  24         /** Number of columns in this table. */
  25         NUM_ATT_COLUMNS
  26 };
  27
  28 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
  29 {
  30         const unsigned char *c1 = (const unsigned char*)obj1->data;
  31         const unsigned char *c2 = (const unsigned char*)obj2->data;
  32         if (*c1 > *c2)
  33                 return 1;
  34         if (*c1 < *c2)
  35                 return -1;
  36         return 0;
  37 }
  38
  39 static struct osl_column_description att_cols[] = {
  40         [ATTCOL_BITNUM] = {
  41                 .storage_type = OSL_MAPPED_STORAGE,
  42                 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
  43                 .name = "bitnum",
  44                 .compare_function = char_compare,
  45                 .data_size = 1
  46         },
  47         [ATTCOL_NAME] = {
  48                 .storage_type = OSL_MAPPED_STORAGE,
  49                 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
  50                 .name = "name",
  51                 .compare_function = string_compare,
  52         }
  53 };
  54
  55 static struct osl_table_description attribute_table_desc = {
  56         .name = "attributes",
  57         .num_columns = NUM_ATT_COLUMNS,
  58         .flags = 0,
  59         .column_descriptions = att_cols
  60 };
  61
  62 static void find_greatest_att_bitnum(void)
  63 {
  64         unsigned char c = 63;
  65         do {
  66                 struct osl_row *row;
  67                 struct osl_object obj = {.data = &c, .size = 1};
  68                 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
  69                                 &row) >= 0) {
  70                         greatest_att_bitnum = c;
  71                         return;
  72                 }
  73         } while (c--);
  74         PARA_INFO_LOG("%s\n", "no attributes");
  75         greatest_att_bitnum = -E_NO_ATTRIBUTES;
  76 }
  77
  78 /**
  79  * Retrieve the identifier (number) of an attribute.
  80  *
  81  * \param att_name The name of the attribute.
  82  * \param bitnum Result pointer.
  83  *
  84  * \return Positive on success, negative on errors.
  85  */
  86 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
  87 {
  88         struct osl_object obj = {.data = (char *)att_name,
  89                 .size = strlen(att_name) + 1};
  90         struct osl_row *row;
  91         int ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
  92
  93         if (ret < 0)
  94                 return ret;
  95         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj);
  96         if (ret < 0)
  97                 return ret;
  98         *bitnum = *(unsigned char *)obj.data;
  99         return 1;
 100 }
 101
 102 /** Whether "-a" was given for the lsatt command. */
 103 #define LSATT_FLAG_ALPHA 1
 104 /** Whether "-l" was given for the lsatt command. */
 105 #define LSATT_FLAG_LONG 2
 106
 107 /** Data passed via osl_rbtree_loop(). */
 108 struct private_lsatt_data {
 109         /** The given flags for the lsatt command. */
 110         unsigned flags;
 111         /** The result buffer. */
 112         struct para_buffer b;
 113 };
 114
 115 static int print_attribute(struct osl_row *row, void *private_data)
 116 {
 117         struct private_lsatt_data *pld = private_data;
 118         int ret;
 119         struct osl_object name_obj, bitnum_obj;
 120
 121         ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &name_obj);
 122         if (ret < 0)
 123                 return ret;
 124         if (!(pld->flags & LSATT_FLAG_LONG)) {
 125                 para_printf(&pld->b, "%s\n", (char *)name_obj.data);
 126                 return 1;
 127         }
 128         ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &bitnum_obj);
 129         if (ret < 0)
 130                 return ret;
 131         para_printf(&pld->b, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
 132                 (char *)name_obj.data);
 133         return 1;
 134 }
 135
 136 static int com_lsatt_callback(const struct osl_object *query,
 137                 struct osl_object *result)
 138 {
 139         struct private_lsatt_data pld = {.flags = *(uint32_t *) query->data};
 140         int ret;
 141
 142         if (pld.flags & LSATT_FLAG_ALPHA)
 143                 ret = osl_rbtree_loop(attribute_table, ATTCOL_NAME,
 144                         &pld, print_attribute);
 145         else
 146                 ret = osl_rbtree_loop(attribute_table, ATTCOL_BITNUM,
 147                         &pld, print_attribute);
 148         result->data = pld.b.buf;
 149         result->size = pld.b.size;
 150         return ret;
 151 }
 152
 153
 154 int com_lsatt(int fd, int argc, char * const * const argv)
 155 {
 156         int ret, i;
 157         uint32_t flags = 0;
 158         struct osl_object query, result;
 159
 160         for (i = 1; i < argc; i++) {
 161                 const char *arg = argv[i];
 162                 if (arg[0] != '-')
 163                         break;
 164                 if (!strcmp(arg, "--")) {
 165                         i++;
 166                         break;
 167                 }
 168                 if (!strcmp(arg, "-a")) {
 169                         flags |= LSATT_FLAG_ALPHA;
 170                         continue;
 171                 }
 172                 if (!strcmp(arg, "-l")) {
 173                         flags |= LSATT_FLAG_LONG;
 174                         continue;
 175                 }
 176         }
 177         if (argc > i)
 178                 return -E_ATTR_SYNTAX;
 179         query.data = &flags;
 180         query.size = sizeof(flags);
 181         ret = send_callback_request(com_lsatt_callback, &query, &result);
 182         if (ret > 0) {
 183                 ret = send_buffer(fd, (char *)result.data);
 184                 free(result.data);
 185         }
 186         return ret;
 187 }
 188
 189 static int com_setatt_callback(const struct osl_object *query,
 190                 __a_unused struct osl_object *result)
 191 {
 192         char *p;
 193         uint64_t add_mask = 0, del_mask = 0;
 194         int ret;
 195         size_t len;
 196         struct osl_object obj;
 197         struct osl_row *row;
 198
 199         for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
 200                 char c;
 201
 202                 len = strlen(p);
 203                 if (!*p)
 204                         return -E_ATTR_SYNTAX;
 205                 c = p[len - 1];
 206                 if (c != '+' && c != '-')
 207                         break;
 208                 p[len - 1] = '\0';
 209                 obj.data = p;
 210                 obj.size = len + 1;
 211                 ret = osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row);
 212                 if (ret < 0)
 213                         return ret;
 214                 ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM,
 215                         &obj);
 216                 if (ret < 0)
 217                         return ret;
 218                 if (c == '+')
 219                         add_mask |= (1UL << *(unsigned char *)obj.data);
 220                 else
 221                         del_mask |= (1UL << *(unsigned char *)obj.data);
 222         }
 223         if (!add_mask && !del_mask)
 224                 return -E_ATTR_SYNTAX;
 225         PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
 226                 (long long unsigned)del_mask);
 227         for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
 228                 struct afs_info old_afsi, new_afsi;
 229                 struct osl_row *aft_row;
 230
 231                 len = strlen(p);
 232                 ret = aft_get_row_of_path(p, &aft_row);
 233                 if (ret < 0)
 234                         return ret;
 235                 ret = get_afsi_object_of_row(aft_row, &obj);
 236                 if (ret < 0)
 237                         return ret;
 238                 ret = load_afsi(&old_afsi, &obj);
 239                 if (ret < 0)
 240                         return ret;
 241                 new_afsi = old_afsi;
 242                 new_afsi.attributes |= add_mask;
 243                 new_afsi.attributes &= ~del_mask;
 244                 save_afsi(&new_afsi, &obj); /* in-place update */
 245 //              ret = mood_update_audio_file(aft_row, &old_afsi);
 246 //              if (ret < 0)
 247 //                      return ret;
 248         }
 249         return 1;
 250 }
 251
 252 int com_setatt(__a_unused int fd, int argc, char * const * const argv)
 253 {
 254         if (argc < 2)
 255                 return -E_ATTR_SYNTAX;
 256         return send_standard_callback_request(argc - 1, argv + 1, com_setatt_callback,
 257                 NULL);
 258 }
 259
 260 /* TODO: make it faster by only extracting the attribute member from afsi */
 261 static int logical_and_attribute(struct osl_row *aft_row, void *attribute_ptr)
 262 {
 263         struct afs_info afsi;
 264         uint64_t *att = attribute_ptr;
 265         struct osl_object obj;
 266         int ret = get_afsi_object_of_row(aft_row, &obj);
 267         if (ret < 0)
 268                 return ret;
 269         ret = load_afsi(&afsi, &obj);
 270         if (ret < 0)
 271                 return ret;
 272         afsi.attributes &= *att;
 273         save_afsi(&afsi, &obj);
 274         return 1;
 275 }
 276
 277 static int com_addatt_callback(const struct osl_object *query,
 278                 __a_unused struct osl_object *result)
 279 {
 280         char *p = query->data;
 281         uint64_t atts_added = 0;
 282         int ret;
 283
 284         while (p < (char *)query->data + query->size) {
 285                 struct osl_object objs[NUM_ATT_COLUMNS];
 286                 struct osl_row *row;
 287                 unsigned char bitnum;
 288
 289                 objs[ATTCOL_BITNUM].size = 1;
 290                 objs[ATTCOL_NAME].data = p;
 291                 objs[ATTCOL_NAME].size = strlen(p) + 1;
 292                 ret = osl_get_row(attribute_table, ATTCOL_NAME,
 293                         &objs[ATTCOL_NAME], &row); /* expected to fail */
 294                 if (ret >= 0)
 295                         return -E_ATTR_EXISTS;
 296                 if (ret != -E_RB_KEY_NOT_FOUND) /* error */
 297                         return ret;
 298                 /* find smallest non-used attribute */
 299                 for (bitnum = 0; bitnum < 64; bitnum++) {
 300                         objs[ATTCOL_BITNUM].data = &bitnum;
 301                         ret = osl_get_row(attribute_table, ATTCOL_BITNUM,
 302                                 &objs[ATTCOL_BITNUM], &row);
 303                         if (ret == -E_RB_KEY_NOT_FOUND)
 304                                 break; /* this bitnum is unused, use it */
 305                         if (ret < 0) /* error */
 306                                 return ret;
 307                         /* this bit is already in use, try next bit */
 308                 }
 309                 if (bitnum == 64)
 310                         return -E_ATTR_TABLE_FULL;
 311                 ret = osl_add_row(attribute_table, objs);
 312                 if (ret < 0)
 313                         return ret;
 314                 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, bitnum);
 315                 atts_added |= 1 << bitnum;
 316                 p += strlen(p) + 1;
 317         }
 318         if (!atts_added)
 319                 return 1;
 320         atts_added = ~atts_added;
 321         ret = audio_file_loop(&atts_added, logical_and_attribute);
 322         if (ret < 0)
 323                 return ret;
 324         find_greatest_att_bitnum();
 325         return reload_current_mood(); /* FIXME: mood_reload() returns an error */
 326 }
 327
 328 int com_addatt(__a_unused int fd, int argc, char * const * const argv)
 329 {
 330         if (argc < 2)
 331                 return -E_ATTR_SYNTAX;
 332         return send_standard_callback_request(argc - 1, argv + 1, com_addatt_callback,
 333                 NULL);
 334 }
 335
 336 static int com_rmatt_callback(const struct osl_object *query,
 337                 __a_unused struct osl_object *result)
 338 {
 339         char *p = query->data;
 340         int ret, atts_removed = 0;
 341         while (p < (char *)query->data + query->size) {
 342                 struct osl_object obj = {
 343                         .data = p,
 344                         .size = strlen(p) + 1
 345                 };
 346                 struct osl_row *row;
 347                 ret = osl_get_row(attribute_table, ATTCOL_NAME,
 348                         &obj, &row);
 349                 if (ret < 0)
 350                         return ret;
 351                 ret = osl_del_row(attribute_table, row);
 352                 if (ret < 0)
 353                         return ret;
 354                 atts_removed++;
 355                 p += strlen(p) + 1;
 356         }
 357         find_greatest_att_bitnum();
 358         if (!atts_removed)
 359                 return 1;
 360         return reload_current_mood();
 361 }
 362
 363 int com_rmatt(__a_unused int fd, int argc, char * const * const argv)
 364 {
 365         if (argc < 2)
 366                 return -E_ATTR_SYNTAX;
 367         return send_standard_callback_request(argc - 1, argv + 1, com_rmatt_callback,
 368                 NULL);
 369 }
 370
 371 /**
 372  * Return a binary representation of the geiven attribute value.
 373  *
 374  * \param atts Pointer to the attribute value.
 375  * \param buf Result.
 376  *
 377  * This function prints a string of at most 64 characters plus the terminating
 378  * \p NULL character into \a buf which must be provided by the caller and at
 379  * least 65 bytes long. The "x" character is used for set attributes and "-" is
 380  * used for unset attributes.
 381  *
 382  * In practice, not all 64 attributes are defined. In this case, the function
 383  * only prints \a N + 1 charaters where \a N is the greatest id of a defined
 384  * attribute.
 385  */
 386 void get_attribute_bitmap(const uint64_t *atts, char *buf)
 387 {
 388         int i;
 389         const uint64_t one = 1;
 390
 391         for (i = 0; i <= greatest_att_bitnum; i++)
 392                 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
 393         buf[i] = '\0';
 394 }
 395
 396 /**
 397  * Get a string containing the set attributes in text form.
 398  *
 399  * \param atts The attribute bitmap.
 400  * \param delim The delimiter to separate matching attribute names.
 401  * \param text Result pointer.
 402  *
 403  * \return Positive on success, negative on errors. If no attributes have
 404  * been defined, \a *text is NULL.
 405  */
 406 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
 407 {
 408         int i, ret;
 409         const uint64_t one = 1;
 410
 411         *text = NULL;
 412         if (greatest_att_bitnum < 0) /* no attributes available */
 413                 return 1;
 414         for (i = 0; i <= greatest_att_bitnum; i++) {
 415                 unsigned char bn = i;
 416                 struct osl_object obj = {.data = &bn, .size = 1};
 417                 struct osl_row *row;
 418
 419                 if (!(*atts & (one << i)))
 420                         continue;
 421                 ret = osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row);
 422                 if (ret < 0)
 423                         goto err;
 424                 ret = osl_get_object(attribute_table, row, ATTCOL_NAME, &obj);
 425                 if (ret < 0)
 426                         goto err;
 427                 if (*text) {
 428                         char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
 429                         free(*text);
 430                         *text = tmp;
 431                 } else
 432                         *text = para_strdup(obj.data);
 433         }
 434         if (!*text) /* no attributes set */
 435                 *text = para_strdup("");
 436         return 1;
 437 err:
 438         free(*text);
 439         return ret;
 440 }
 441
 442 /**
 443  * Close the attribute table.
 444  *
 445  * \param flags Ususal flags that are passed to osl_close_table().
 446  *
 447  * \sa osl_close_table().
 448  */
 449 void attribute_shutdown(enum osl_close_flags flags)
 450 {
 451         osl_close_table(attribute_table, flags);
 452         attribute_table = NULL;
 453 }
 454
 455 /**
 456  * Open the attribute table.
 457  *
 458  * \param ti Gets initialized by this function.
 459  * \param db The database directory.
 460  *
 461  * \return Positive on success, negative on errors.
 462  *
 463  * \sa osl_open_table().
 464  */
 465 int attribute_init(struct table_info *ti, const char *db)
 466 {
 467         int ret;
 468
 469         attribute_table_desc.dir = db;
 470         ti->desc = &attribute_table_desc;
 471         ret = osl_open_table(ti->desc, &attribute_table);
 472         greatest_att_bitnum = -1; /* no atts available */
 473         if (ret >= 0) {
 474                 find_greatest_att_bitnum();
 475                 return ret;
 476         }
 477         attribute_table = NULL;
 478         if (ret == -E_NOENT)
 479                 return 1;
 480         return ret;
 481 }