release/src/router/libncurses/ncurses/base/key_defined.c

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   2  * Copyright (c) 2003-2006,2009 Free Software Foundation, Inc.              *
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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey, 2003                                          *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34
  35 MODULE_ID("$Id: key_defined.c,v 1.9 2009/10/24 22:15:47 tom Exp $")
  36
  37 static int
  38 find_definition(TRIES * tree, const char *str)
  39 {
  40     TRIES *ptr;
  41     int result = OK;
  42
  43     if (str != 0 && *str != '\0') {
  44         for (ptr = tree; ptr != 0; ptr = ptr->sibling) {
  45             if (UChar(*str) == UChar(ptr->ch)) {
  46                 if (str[1] == '\0' && ptr->child != 0) {
  47                     result = ERR;
  48                 } else if ((result = find_definition(ptr->child, str + 1))
  49                            == OK) {
  50                     result = ptr->value;
  51                 } else if (str[1] == '\0') {
  52                     result = ERR;
  53                 }
  54             }
  55             if (result != OK)
  56                 break;
  57         }
  58     }
  59     return (result);
  60 }
  61
  62 /*
  63  * Returns the keycode associated with the given string.  If none is found,
  64  * return OK.  If the string is only a prefix to other strings, return ERR.
  65  * Otherwise, return the keycode's value (neither OK/ERR).
  66  */
  67 NCURSES_EXPORT(int)
  68 NCURSES_SP_NAME(key_defined) (NCURSES_SP_DCLx const char *str)
  69 {
  70     int code = ERR;
  71
  72     T((T_CALLED("key_defined(%p, %s)"), (void *) SP_PARM, _nc_visbuf(str)));
  73     if (SP_PARM != 0 && str != 0) {
  74         code = find_definition(SP_PARM->_keytry, str);
  75     }
  76
  77     returnCode(code);
  78 }
  79
  80 #if NCURSES_SP_FUNCS
  81 NCURSES_EXPORT(int)
  82 key_defined(const char *str)
  83 {
  84     return NCURSES_SP_NAME(key_defined) (CURRENT_SCREEN, str);
  85 }
  86 #endif