ncurses 5.6 - patch 20080920
[ncurses.git] / ncurses / tinfo / lib_termcap.c
index 8238b368eea3e581a2e6b23bda576ea9434e8005..2d245ffbb61f345db2ca0741134ca3c7c6804f84 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998 Free Software Foundation, Inc.                        *
+ * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
 /****************************************************************************
  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
+ *     and: Thomas E. Dickey                        1996-on                 *
+ *                                                                          *
+ * some of the code in here was contributed by:                             *
+ * Magnus Bengtsson, d6mbeng@dtek.chalmers.se (Nov'93)                      *
+ * (but it has changed a lot)                                               *
  ****************************************************************************/
 
+#define __INTERNAL_CAPS_VISIBLE
 #include <curses.priv.h>
 
 #include <termcap.h>
 #include <tic.h>
+#include <ctype.h>
 
-#define __INTERNAL_CAPS_VISIBLE
 #include <term_entry.h>
 
-MODULE_ID("$Id: lib_termcap.c,v 1.29 1999/09/05 01:06:43 tom Exp $")
+MODULE_ID("$Id: lib_termcap.c,v 1.63 2008/08/16 19:22:55 tom Exp $")
+
+NCURSES_EXPORT_VAR(char *) UP = 0;
+NCURSES_EXPORT_VAR(char *) BC = 0;
 
-/*
-   some of the code in here was contributed by:
-   Magnus Bengtsson, d6mbeng@dtek.chalmers.se
-*/
+#define MyCache  _nc_globals.tgetent_cache
+#define CacheInx _nc_globals.tgetent_index
+#define CacheSeq _nc_globals.tgetent_sequence
 
-char *UP;
-char *BC;
+#define FIX_SGR0 MyCache[CacheInx].fix_sgr0
+#define LAST_TRM MyCache[CacheInx].last_term
+#define LAST_BUF MyCache[CacheInx].last_bufp
+#define LAST_USE MyCache[CacheInx].last_used
+#define LAST_SEQ MyCache[CacheInx].sequence
 
 /***************************************************************************
  *
@@ -64,29 +75,97 @@ char *BC;
  *
  ***************************************************************************/
 
-int tgetent(char *bufp GCC_UNUSED, const char *name)
+NCURSES_EXPORT(int)
+tgetent(char *bufp, const char *name)
 {
-int errcode;
+    int errcode;
+    int n;
+    bool found_cache = FALSE;
+
+    START_TRACE();
+    T((T_CALLED("tgetent()")));
+
+    _nc_setupterm((NCURSES_CONST char *) name, STDOUT_FILENO, &errcode, TRUE);
+
+    /*
+     * In general we cannot tell if the fixed sgr0 is still used by the
+     * caller, but if tgetent() is called with the same buffer, that is
+     * good enough, since the previous data would be invalidated by the
+     * current call.
+     *
+     * bufp may be a null pointer, e.g., GNU termcap.  That allocates data,
+     * which is good until the next tgetent() call.  The conventional termcap
+     * is inconvenient because of the fixed buffer size, but because it uses
+     * caller-supplied buffers, can have multiple terminal descriptions in
+     * use at a given time.
+     */
+    for (n = 0; n < TGETENT_MAX; ++n) {
+       bool same_result = (MyCache[n].last_used && MyCache[n].last_bufp == bufp);
+       if (same_result) {
+           CacheInx = n;
+           if (FIX_SGR0 != 0) {
+               FreeAndNull(FIX_SGR0);
+           }
+           /*
+            * Also free the terminfo data that we loaded (much bigger leak).
+            */
+           if (LAST_TRM != 0 && LAST_TRM != cur_term) {
+               TERMINAL *trm = LAST_TRM;
+               del_curterm(LAST_TRM);
+               for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx)
+                   if (LAST_TRM == trm)
+                       LAST_TRM = 0;
+               CacheInx = n;
+           }
+           found_cache = TRUE;
+           break;
+       }
+    }
+    if (!found_cache) {
+       int best = 0;
+
+       for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx) {
+           if (LAST_SEQ < MyCache[best].sequence) {
+               best = CacheInx;
+           }
+       }
+       CacheInx = best;
+    }
+    LAST_TRM = cur_term;
+    LAST_SEQ = ++CacheSeq;
 
-       T((T_CALLED("tgetent()")));
+    PC = 0;
+    UP = 0;
+    BC = 0;
+    FIX_SGR0 = 0;              /* don't free it - application may still use */
 
-       setupterm((NCURSES_CONST char *)name, STDOUT_FILENO, &errcode);
+    if (errcode == 1) {
 
-       if (errcode == 1) {
+       if (cursor_left)
+           if ((backspaces_with_bs = (char) !strcmp(cursor_left, "\b")) == 0)
+               backspace_if_not_bs = cursor_left;
 
-               if (cursor_left)
-                   if ((backspaces_with_bs = !strcmp(cursor_left, "\b")) == 0)
-                       backspace_if_not_bs = cursor_left;
+       /* we're required to export these */
+       if (pad_char != NULL)
+           PC = pad_char[0];
+       if (cursor_up != NULL)
+           UP = cursor_up;
+       if (backspace_if_not_bs != NULL)
+           BC = backspace_if_not_bs;
 
-               /* we're required to export these */
-               if (pad_char != NULL)
-                       PC = pad_char[0];
-               if (cursor_up != NULL)
-                       UP = cursor_up;
-               if (backspace_if_not_bs != NULL)
-                       BC = backspace_if_not_bs;
+       if ((FIX_SGR0 = _nc_trim_sgr0(&(cur_term->type))) != 0) {
+           if (!strcmp(FIX_SGR0, exit_attribute_mode)) {
+               if (FIX_SGR0 != exit_attribute_mode) {
+                   free(FIX_SGR0);
+               }
+               FIX_SGR0 = 0;
+           }
+       }
+       LAST_BUF = bufp;
+       LAST_USE = TRUE;
 
-               (void) baudrate();      /* sets ospeed as a side-effect */
+       SetNoPadding(SP);
+       (void) baudrate();      /* sets ospeed as a side-effect */
 
 /* LINT_PREPRO
 #if 0*/
@@ -94,8 +173,8 @@ int errcode;
 /* LINT_PREPRO
 #endif*/
 
-       }
-       returnCode(errcode);
+    }
+    returnCode(errcode);
 }
 
 /***************************************************************************
@@ -107,22 +186,23 @@ int errcode;
  *
  ***************************************************************************/
 
-int tgetflag(NCURSES_CONST char *id)
+NCURSES_EXPORT(int)
+tgetflag(NCURSES_CONST char *id)
 {
-int i;
-
-       T((T_CALLED("tgetflag(%s)"), id));
-       if (cur_term != 0) {
-           TERMTYPE *tp = &(cur_term->type);
-           for_each_boolean(i, tp) {
-               const char *capname = ExtBoolname(tp, i, boolcodes);
-               if (!strncmp(id, capname, 2)) {
-                   /* setupterm forces invalid booleans to false */
-                   returnCode(tp->Booleans[i]);
-               }
+    unsigned i;
+
+    T((T_CALLED("tgetflag(%s)"), id));
+    if (cur_term != 0) {
+       TERMTYPE *tp = &(cur_term->type);
+       for_each_boolean(i, tp) {
+           const char *capname = ExtBoolname(tp, i, boolcodes);
+           if (!strncmp(id, capname, 2)) {
+               /* setupterm forces invalid booleans to false */
+               returnCode(tp->Booleans[i]);
            }
        }
-       returnCode(0);  /* Solaris does this */
+    }
+    returnCode(0);             /* Solaris does this */
 }
 
 /***************************************************************************
@@ -134,23 +214,24 @@ int i;
  *
  ***************************************************************************/
 
-int tgetnum(NCURSES_CONST char *id)
+NCURSES_EXPORT(int)
+tgetnum(NCURSES_CONST char *id)
 {
-int i;
-
-       T((T_CALLED("tgetnum(%s)"), id));
-       if (cur_term != 0) {
-           TERMTYPE *tp = &(cur_term->type);
-           for_each_number(i, tp) {
-               const char *capname = ExtNumname(tp, i, numcodes);
-               if (!strncmp(id, capname, 2)) {
-                   if (!VALID_NUMERIC(tp->Numbers[i]))
-                       return -1;
-                   returnCode(tp->Numbers[i]);
-               }
+    unsigned i;
+
+    T((T_CALLED("tgetnum(%s)"), id));
+    if (cur_term != 0) {
+       TERMTYPE *tp = &(cur_term->type);
+       for_each_number(i, tp) {
+           const char *capname = ExtNumname(tp, i, numcodes);
+           if (!strncmp(id, capname, 2)) {
+               if (!VALID_NUMERIC(tp->Numbers[i]))
+                   returnCode(ABSENT_NUMERIC);
+               returnCode(tp->Numbers[i]);
            }
        }
-       returnCode(ERR);
+    }
+    returnCode(ABSENT_NUMERIC);
 }
 
 /***************************************************************************
@@ -162,43 +243,49 @@ int i;
  *
  ***************************************************************************/
 
-char *tgetstr(NCURSES_CONST char *id, char **area)
+NCURSES_EXPORT(char *)
+tgetstr(NCURSES_CONST char *id, char **area)
 {
-int i;
-
-       T((T_CALLED("tgetstr(%s,%p)"), id, area));
-       if (cur_term != 0) {
-           TERMTYPE *tp = &(cur_term->type);
-           for_each_string(i, tp) {
-               const char *capname = ExtStrname(tp, i, strcodes);
-               T(("trying %s", capname));
-               if (!strncmp(id, capname, 2)) {
-                   T(("found match : %s", _nc_visbuf(tp->Strings[i])));
-                   /* setupterm forces cancelled strings to null */
+    unsigned i;
+    char *result = NULL;
+
+    T((T_CALLED("tgetstr(%s,%p)"), id, area));
+    if (cur_term != 0) {
+       TERMTYPE *tp = &(cur_term->type);
+       for_each_string(i, tp) {
+           const char *capname = ExtStrname(tp, i, strcodes);
+           if (!strncmp(id, capname, 2)) {
+               result = tp->Strings[i];
+               TR(TRACE_DATABASE, ("found match : %s", _nc_visbuf(result)));
+               /* setupterm forces canceled strings to null */
+               if (VALID_STRING(result)) {
+                   if (result == exit_attribute_mode
+                       && FIX_SGR0 != 0) {
+                       result = FIX_SGR0;
+                       TR(TRACE_DATABASE, ("altered to : %s", _nc_visbuf(result)));
+                   }
                    if (area != 0
-                    && *area != 0
-                    && VALID_STRING(tp->Strings[i])) {
-                       (void) strcpy(*area, tp->Strings[i]);
+                       && *area != 0) {
+                       (void) strcpy(*area, result);
+                       result = *area;
                        *area += strlen(*area) + 1;
                    }
-                   returnPtr(tp->Strings[i]);
                }
+               break;
            }
        }
-       returnPtr(NULL);
+    }
+    returnPtr(result);
 }
 
-/*
- *     char *
- *     tgoto(string, x, y)
- *
- *     Retained solely for upward compatibility.  Note the intentional
- *     reversing of the last two arguments.
- *
- */
-
-char *tgoto(const char *string, int x, int y)
+#if NO_LEAKS
+NCURSES_EXPORT(void)
+_nc_tgetent_leaks(void)
 {
-       T((T_CALLED("tgoto(%s,%d,%d)"), string, x, y));
-       returnPtr(tparm((NCURSES_CONST char *)string, y, x));
+    for (CacheInx = 0; CacheInx < TGETENT_MAX; ++CacheInx) {
+       FreeIfNeeded(FIX_SGR0);
+       if (LAST_TRM != 0)
+           del_curterm(LAST_TRM);
+    }
 }
+#endif