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

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  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey                                                *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34
  35 #include <ctype.h>
  36 #include <termcap.h>
  37
  38 MODULE_ID("$Id: lib_tgoto.c,v 1.16 2012/02/24 02:08:08 tom Exp $")
  39
  40 #if !PURE_TERMINFO
  41 static bool
  42 is_termcap(const char *string)
  43 {
  44     bool result = TRUE;
  45
  46     if (string == 0 || *string == '\0') {
  47         result = FALSE;         /* tparm() handles empty strings */
  48     } else {
  49         while ((*string != '\0') && result) {
  50             if (*string == '%') {
  51                 switch (*++string) {
  52                 case 'p':
  53                     result = FALSE;
  54                     break;
  55                 case '\0':
  56                     string--;
  57                     break;
  58                 }
  59             } else if (string[0] == '$' && string[1] == '<') {
  60                 result = FALSE;
  61             }
  62             string++;
  63         }
  64     }
  65     return result;
  66 }
  67
  68 static char *
  69 tgoto_internal(const char *string, int x, int y)
  70 {
  71     static char *result;
  72     static size_t length;
  73
  74     int swap_arg;
  75     int param[3];
  76     size_t used = 0;
  77     size_t need = 10;
  78     int *value = param;
  79     bool need_BC = FALSE;
  80
  81     if (BC)
  82         need += strlen(BC);
  83
  84     param[0] = y;
  85     param[1] = x;
  86     param[2] = 0;
  87
  88     while (*string != 0) {
  89         if ((used + need) > length) {
  90             length += (used + need);
  91             if ((result = typeRealloc(char, length, result)) == 0) {
  92                 length = 0;
  93                 break;
  94             }
  95         }
  96         if (*string == '%') {
  97             const char *fmt = 0;
  98
  99             switch (*++string) {
 100             case '\0':
 101                 string--;
 102                 break;
 103             case 'd':
 104                 fmt = "%d";
 105                 break;
 106             case '2':
 107                 fmt = "%02d";
 108                 *value %= 100;
 109                 break;
 110             case '3':
 111                 fmt = "%03d";
 112                 *value %= 1000;
 113                 break;
 114             case '+':
 115                 *value += UChar(*++string);
 116                 /* FALLTHRU */
 117             case '.':
 118                 /*
 119                  * Guard against tputs() seeing a truncated string.  The
 120                  * termcap documentation refers to a similar fixup for \n
 121                  * and \r, but I don't see that it could work -TD
 122                  */
 123                 if (*value == 0) {
 124                     if (BC != 0) {
 125                         *value += 1;
 126                         need_BC = TRUE;
 127                     } else {
 128                         *value = 0200;  /* tputs will treat this as \0 */
 129                     }
 130                 }
 131                 result[used++] = (char) *value++;
 132                 break;
 133             case '%':
 134                 result[used++] = *string;
 135                 break;
 136             case 'r':
 137                 swap_arg = param[0];
 138                 param[0] = param[1];
 139                 param[1] = swap_arg;
 140                 break;
 141             case 'i':
 142                 param[0] += 1;
 143                 param[1] += 1;
 144                 break;
 145             case '>':
 146                 if (*value > string[1])
 147                     *value += string[2];
 148                 string += 2;
 149                 break;
 150             case 'n':           /* Datamedia 2500 */
 151                 param[0] ^= 0140;
 152                 param[1] ^= 0140;
 153                 break;
 154             case 'B':           /* BCD */
 155                 *value = 16 * (*value / 10) + (*value % 10);
 156                 break;
 157             case 'D':           /* Reverse coding (Delta Data) */
 158                 *value -= 2 * (*value % 16);
 159                 break;
 160             }
 161             if (fmt != 0) {
 162                 _nc_SPRINTF(result + used, _nc_SLIMIT(length - used)
 163                             fmt, *value++);
 164                 used += strlen(result + used);
 165                 fmt = 0;
 166             }
 167             if (value - param > 2) {
 168                 value = param + 2;
 169                 *value = 0;
 170             }
 171         } else {
 172             result[used++] = *string;
 173         }
 174         string++;
 175     }
 176     if (result != 0) {
 177         if (need_BC) {
 178             _nc_STRCPY(result + used, BC, length - used);
 179             used += strlen(BC);
 180         }
 181         result[used] = '\0';
 182     }
 183     return result;
 184 }
 185 #endif
 186
 187 /*
 188  * Retained solely for upward compatibility.  Note the intentional reversing of
 189  * the last two arguments when invoking tparm().
 190  */
 191 NCURSES_EXPORT(char *)
 192 tgoto(const char *string, int x, int y)
 193 {
 194     char *result;
 195
 196     T((T_CALLED("tgoto(%s, %d, %d)"), _nc_visbuf(string), x, y));
 197 #if !PURE_TERMINFO
 198     if (is_termcap(string))
 199         result = tgoto_internal(string, x, y);
 200     else
 201 #endif
 202         result = TPARM_2((NCURSES_CONST char *) string, y, x);
 203     returnPtr(result);
 204 }