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

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey            1998-on                             *
  31  ****************************************************************************/
  32
  33 /*
  34 **      add_tries.c
  35 **
  36 **      Add keycode/string to tries-tree.
  37 **
  38 */
  39
  40 #include <curses.priv.h>
  41
  42 MODULE_ID("$Id: add_tries.c,v 1.10 2010/12/19 01:31:14 tom Exp $")
  43
  44 #define SET_TRY(dst,src) if ((dst->ch = *src++) == 128) dst->ch = '\0'
  45 #define CMP_TRY(a,b) ((a)? (a == b) : (b == 128))
  46
  47 NCURSES_EXPORT(int)
  48 _nc_add_to_try(TRIES ** tree, const char *str, unsigned code)
  49 {
  50     TRIES *ptr, *savedptr;
  51     unsigned const char *txt = (unsigned const char *) str;
  52
  53     T((T_CALLED("_nc_add_to_try(%p, %s, %u)"),
  54        (void *) *tree, _nc_visbuf(str), code));
  55     if (txt == 0 || *txt == '\0' || code == 0)
  56         returnCode(ERR);
  57
  58     if ((*tree) != 0) {
  59         ptr = savedptr = (*tree);
  60
  61         for (;;) {
  62             unsigned char cmp = *txt;
  63
  64             while (!CMP_TRY(ptr->ch, cmp)
  65                    && ptr->sibling != 0)
  66                 ptr = ptr->sibling;
  67
  68             if (CMP_TRY(ptr->ch, cmp)) {
  69                 if (*(++txt) == '\0') {
  70                     ptr->value = (unsigned short) code;
  71                     returnCode(OK);
  72                 }
  73                 if (ptr->child != 0)
  74                     ptr = ptr->child;
  75                 else
  76                     break;
  77             } else {
  78                 if ((ptr->sibling = typeCalloc(TRIES, 1)) == 0) {
  79                     returnCode(ERR);
  80                 }
  81
  82                 savedptr = ptr = ptr->sibling;
  83                 SET_TRY(ptr, txt);
  84                 ptr->value = 0;
  85
  86                 break;
  87             }
  88         }                       /* end for (;;) */
  89     } else {                    /* (*tree) == 0 :: First sequence to be added */
  90         savedptr = ptr = (*tree) = typeCalloc(TRIES, 1);
  91
  92         if (ptr == 0) {
  93             returnCode(ERR);
  94         }
  95
  96         SET_TRY(ptr, txt);
  97         ptr->value = 0;
  98     }
  99
 100     /* at this point, we are adding to the try.  ptr->child == 0 */
 101
 102     while (*txt) {
 103         ptr->child = typeCalloc(TRIES, 1);
 104
 105         ptr = ptr->child;
 106
 107         if (ptr == 0) {
 108             while ((ptr = savedptr) != 0) {
 109                 savedptr = ptr->child;
 110                 free(ptr);
 111             }
 112             returnCode(ERR);
 113         }
 114
 115         SET_TRY(ptr, txt);
 116         ptr->value = 0;
 117     }
 118
 119     ptr->value = (unsigned short) code;
 120     returnCode(OK);
 121 }