release/src/router/libncurses/ncurses/tinfo/lib_termcap.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
   3  *                                                                          *
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   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
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   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  *     and: Juergen Pfeifer                                                 *
  34  *                                                                          *
  35  * some of the code in here was contributed by:                             *
  36  * Magnus Bengtsson, d6mbeng@dtek.chalmers.se (Nov'93)                      *
  37  * (but it has changed a lot)                                               *
  38  ****************************************************************************/
  39
  40 #define __INTERNAL_CAPS_VISIBLE
  41 #include <curses.priv.h>
  42
  43 #include <termcap.h>
  44 #include <tic.h>
  45 #include <ctype.h>
  46
  47 #ifndef CUR
  48 #define CUR SP_TERMTYPE
  49 #endif
  50
  51 MODULE_ID("$Id: lib_termcap.c,v 1.73 2010/12/25 19:27:12 tom Exp $")
  52
  53 NCURSES_EXPORT_VAR(char *) UP = 0;
  54 NCURSES_EXPORT_VAR(char *) BC = 0;
  55
  56 #define MyCache  _nc_globals.tgetent_cache
  57 #define CacheInx _nc_globals.tgetent_index
  58 #define CacheSeq _nc_globals.tgetent_sequence
  59
  60 #define FIX_SGR0 MyCache[CacheInx].fix_sgr0
  61 #define LAST_TRM MyCache[CacheInx].last_term
  62 #define LAST_BUF MyCache[CacheInx].last_bufp
  63 #define LAST_USE MyCache[CacheInx].last_used
  64 #define LAST_SEQ MyCache[CacheInx].sequence
  65
  66 /***************************************************************************
  67  *
  68  * tgetent(bufp, term)
  69  *
  70  * In termcap, this function reads in the entry for terminal `term' into the
  71  * buffer pointed to by bufp. It must be called before any of the functions
  72  * below are called.
  73  * In this terminfo emulation, tgetent() simply calls setupterm() (which
  74  * does a bit more than tgetent() in termcap does), and returns its return
  75  * value (1 if successful, 0 if no terminal with the given name could be
  76  * found, or -1 if no terminal descriptions have been installed on the
  77  * system).  The bufp argument is ignored.
  78  *
  79  ***************************************************************************/
  80
  81 NCURSES_EXPORT(int)
  82 NCURSES_SP_NAME(tgetent) (NCURSES_SP_DCLx char *bufp, const char *name)
  83 {
  84     int rc = ERR;
  85     int n;
  86     bool found_cache = FALSE;
  87 #ifdef USE_TERM_DRIVER
  88     TERMINAL *termp = 0;
  89 #endif
  90
  91     START_TRACE();
  92     T((T_CALLED("tgetent()")));
  93
  94     TINFO_SETUP_TERM(&termp, (NCURSES_CONST char *) name,
  95                      STDOUT_FILENO, &rc, TRUE);
  96
  97 #ifdef USE_TERM_DRIVER
  98     if (termp == 0 ||
  99         !((TERMINAL_CONTROL_BLOCK *) termp)->drv->isTerminfo)
 100         return (rc);
 101 #endif
 102
 103     /*
 104      * In general we cannot tell if the fixed sgr0 is still used by the
 105      * caller, but if tgetent() is called with the same buffer, that is
 106      * good enough, since the previous data would be invalidated by the
 107      * current call.
 108      *
 109      * bufp may be a null pointer, e.g., GNU termcap.  That allocates data,
 110      * which is good until the next tgetent() call.  The conventional termcap
 111      * is inconvenient because of the fixed buffer size, but because it uses
 112      * caller-supplied buffers, can have multiple terminal descriptions in
 113      * use at a given time.
 114      */
 115     for (n = 0; n < TGETENT_MAX; ++n) {
 116         bool same_result = (MyCache[n].last_used && MyCache[n].last_bufp == bufp);
 117         if (same_result) {
 118             CacheInx = n;
 119             if (FIX_SGR0 != 0) {
 120                 FreeAndNull(FIX_SGR0);
 121             }
 122             /*
 123              * Also free the terminfo data that we loaded (much bigger leak).
 124              */
 125             if (LAST_TRM != 0 && LAST_TRM != TerminalOf(SP_PARM)) {
 126                 TERMINAL *trm = LAST_TRM;
 127                 NCURSES_SP_NAME(del_curterm) (NCURSES_SP_ARGx LAST_TRM);
 128                 for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx)
 129                     if (LAST_TRM == trm)
 130                         LAST_TRM = 0;
 131                 CacheInx = n;
 132             }
 133             found_cache = TRUE;
 134             break;
 135         }
 136     }
 137     if (!found_cache) {
 138         int best = 0;
 139
 140         for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx) {
 141             if (LAST_SEQ < MyCache[best].sequence) {
 142                 best = CacheInx;
 143             }
 144         }
 145         CacheInx = best;
 146     }
 147     LAST_TRM = TerminalOf(SP_PARM);
 148     LAST_SEQ = ++CacheSeq;
 149
 150     PC = 0;
 151     UP = 0;
 152     BC = 0;
 153     FIX_SGR0 = 0;               /* don't free it - application may still use */
 154
 155     if (rc == 1) {
 156
 157         if (cursor_left)
 158             if ((backspaces_with_bs = (char) !strcmp(cursor_left, "\b")) == 0)
 159                 backspace_if_not_bs = cursor_left;
 160
 161         /* we're required to export these */
 162         if (pad_char != NULL)
 163             PC = pad_char[0];
 164         if (cursor_up != NULL)
 165             UP = cursor_up;
 166         if (backspace_if_not_bs != NULL)
 167             BC = backspace_if_not_bs;
 168
 169         if ((FIX_SGR0 = _nc_trim_sgr0(&(TerminalOf(SP_PARM)->type))) != 0) {
 170             if (!strcmp(FIX_SGR0, exit_attribute_mode)) {
 171                 if (FIX_SGR0 != exit_attribute_mode) {
 172                     free(FIX_SGR0);
 173                 }
 174                 FIX_SGR0 = 0;
 175             }
 176         }
 177         LAST_BUF = bufp;
 178         LAST_USE = TRUE;
 179
 180         SetNoPadding(SP_PARM);
 181         (void) NCURSES_SP_NAME(baudrate) (NCURSES_SP_ARG);      /* sets ospeed as a side-effect */
 182
 183 /* LINT_PREPRO
 184 #if 0*/
 185 #include <capdefaults.c>
 186 /* LINT_PREPRO
 187 #endif*/
 188
 189     }
 190     returnCode(rc);
 191 }
 192
 193 #if NCURSES_SP_FUNCS
 194 NCURSES_EXPORT(int)
 195 tgetent(char *bufp, const char *name)
 196 {
 197     return NCURSES_SP_NAME(tgetent) (CURRENT_SCREEN, bufp, name);
 198 }
 199 #endif
 200
 201 #if 0
 202 static bool
 203 same_tcname(const char *a, const char *b)
 204 {
 205     fprintf(stderr, "compare(%s,%s)\n", a, b);
 206     return !strncmp(a, b, 2);
 207 }
 208 #else
 209 #define same_tcname(a,b) !strncmp(a,b,2)
 210 #endif
 211
 212 /***************************************************************************
 213  *
 214  * tgetflag(str)
 215  *
 216  * Look up boolean termcap capability str and return its value (TRUE=1 if
 217  * present, FALSE=0 if not).
 218  *
 219  ***************************************************************************/
 220
 221 NCURSES_EXPORT(int)
 222 NCURSES_SP_NAME(tgetflag) (NCURSES_SP_DCLx NCURSES_CONST char *id)
 223 {
 224     int result = 0;             /* Solaris returns zero for missing flag */
 225     int i, j;
 226
 227     T((T_CALLED("tgetflag(%p, %s)"), (void *) SP_PARM, id));
 228     if (HasTInfoTerminal(SP_PARM)) {
 229         TERMTYPE *tp = &(TerminalOf(SP_PARM)->type);
 230         struct name_table_entry const *entry_ptr;
 231
 232         entry_ptr = _nc_find_type_entry(id, BOOLEAN, TRUE);
 233         if (entry_ptr != 0) {
 234             j = entry_ptr->nte_index;
 235         }
 236 #if NCURSES_XNAMES
 237         else {
 238             j = -1;
 239             for_each_ext_boolean(i, tp) {
 240                 const char *capname = ExtBoolname(tp, i, boolcodes);
 241                 if (same_tcname(id, capname)) {
 242                     j = i;
 243                     break;
 244                 }
 245             }
 246         }
 247 #endif
 248         if (j >= 0) {
 249             /* note: setupterm forces invalid booleans to false */
 250             result = tp->Booleans[j];
 251         }
 252     }
 253     returnCode(result);
 254 }
 255
 256 #if NCURSES_SP_FUNCS
 257 NCURSES_EXPORT(int)
 258 tgetflag(NCURSES_CONST char *id)
 259 {
 260     return NCURSES_SP_NAME(tgetflag) (CURRENT_SCREEN, id);
 261 }
 262 #endif
 263
 264 /***************************************************************************
 265  *
 266  * tgetnum(str)
 267  *
 268  * Look up numeric termcap capability str and return its value, or -1 if
 269  * not given.
 270  *
 271  ***************************************************************************/
 272
 273 NCURSES_EXPORT(int)
 274 NCURSES_SP_NAME(tgetnum) (NCURSES_SP_DCLx NCURSES_CONST char *id)
 275 {
 276     int result = ABSENT_NUMERIC;
 277     int i, j;
 278
 279     T((T_CALLED("tgetnum(%p, %s)"), (void *) SP_PARM, id));
 280     if (HasTInfoTerminal(SP_PARM)) {
 281         TERMTYPE *tp = &(TerminalOf(SP_PARM)->type);
 282         struct name_table_entry const *entry_ptr;
 283
 284         entry_ptr = _nc_find_type_entry(id, NUMBER, TRUE);
 285         if (entry_ptr != 0) {
 286             j = entry_ptr->nte_index;
 287         }
 288 #if NCURSES_XNAMES
 289         else {
 290             j = -1;
 291             for_each_ext_number(i, tp) {
 292                 const char *capname = ExtNumname(tp, i, numcodes);
 293                 if (same_tcname(id, capname)) {
 294                     j = i;
 295                     break;
 296                 }
 297             }
 298         }
 299 #endif
 300         if (j >= 0) {
 301             if (VALID_NUMERIC(tp->Numbers[j]))
 302                 result = tp->Numbers[j];
 303         }
 304     }
 305     returnCode(result);
 306 }
 307
 308 #if NCURSES_SP_FUNCS
 309 NCURSES_EXPORT(int)
 310 tgetnum(NCURSES_CONST char *id)
 311 {
 312     return NCURSES_SP_NAME(tgetnum) (CURRENT_SCREEN, id);
 313 }
 314 #endif
 315
 316 /***************************************************************************
 317  *
 318  * tgetstr(str, area)
 319  *
 320  * Look up string termcap capability str and return a pointer to its value,
 321  * or NULL if not given.
 322  *
 323  ***************************************************************************/
 324
 325 NCURSES_EXPORT(char *)
 326 NCURSES_SP_NAME(tgetstr) (NCURSES_SP_DCLx NCURSES_CONST char *id, char **area)
 327 {
 328     char *result = NULL;
 329     int i, j;
 330
 331     T((T_CALLED("tgetstr(%s,%p)"), id, (void *) area));
 332     if (HasTInfoTerminal(SP_PARM)) {
 333         TERMTYPE *tp = &(TerminalOf(SP_PARM)->type);
 334         struct name_table_entry const *entry_ptr;
 335
 336         entry_ptr = _nc_find_type_entry(id, STRING, TRUE);
 337         if (entry_ptr != 0) {
 338             j = entry_ptr->nte_index;
 339         }
 340 #if NCURSES_XNAMES
 341         else {
 342             j = -1;
 343             for_each_ext_string(i, tp) {
 344                 const char *capname = ExtStrname(tp, i, strcodes);
 345                 if (same_tcname(id, capname)) {
 346                     j = i;
 347                     break;
 348                 }
 349             }
 350         }
 351 #endif
 352         if (j >= 0) {
 353             result = tp->Strings[j];
 354             TR(TRACE_DATABASE, ("found match : %s", _nc_visbuf(result)));
 355             /* setupterm forces canceled strings to null */
 356             if (VALID_STRING(result)) {
 357                 if (result == exit_attribute_mode
 358                     && FIX_SGR0 != 0) {
 359                     result = FIX_SGR0;
 360                     TR(TRACE_DATABASE, ("altered to : %s", _nc_visbuf(result)));
 361                 }
 362                 if (area != 0
 363                     && *area != 0) {
 364                     (void) strcpy(*area, result);
 365                     result = *area;
 366                     *area += strlen(*area) + 1;
 367                 }
 368             }
 369         }
 370     }
 371     returnPtr(result);
 372 }
 373
 374 #if NCURSES_SP_FUNCS
 375 NCURSES_EXPORT(char *)
 376 tgetstr(NCURSES_CONST char *id, char **area)
 377 {
 378     return NCURSES_SP_NAME(tgetstr) (CURRENT_SCREEN, id, area);
 379 }
 380 #endif
 381
 382 #if NO_LEAKS
 383 NCURSES_EXPORT(void)
 384 _nc_tgetent_leaks(void)
 385 {
 386     for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx) {
 387         FreeIfNeeded(FIX_SGR0);
 388         if (LAST_TRM != 0)
 389             del_curterm(LAST_TRM);
 390     }
 391 }
 392 #endif