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

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  28
  29 #include <curses.priv.h>
  30
  31 MODULE_ID("$Id: memmove.c,v 1.5 2007/08/11 17:12:43 tom Exp $")
  32
  33 /****************************************************************************
  34  *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
  35  ****************************************************************************/
  36
  37 #if USE_MY_MEMMOVE
  38 #define DST ((char *)s1)
  39 #define SRC ((const char *)s2)
  40 NCURSES_EXPORT(void *)
  41 _nc_memmove(void *s1, const void *s2, size_t n)
  42 {
  43     if (n != 0) {
  44         if ((DST + n > SRC) && (SRC + n > DST)) {
  45             static char *bfr;
  46             static size_t length;
  47             register size_t j;
  48             if (length < n) {
  49                 length = (n * 3) / 2;
  50                 bfr = typeRealloc(char, length, bfr);
  51             }
  52             for (j = 0; j < n; j++)
  53                 bfr[j] = SRC[j];
  54             s2 = bfr;
  55         }
  56         while (n-- != 0)
  57             DST[n] = SRC[n];
  58     }
  59     return s1;
  60 }
  61 #else
  62 extern
  63 NCURSES_EXPORT(void)
  64 _nc_memmove(void);              /* quiet's gcc warning */
  65 NCURSES_EXPORT(void)
  66 _nc_memmove(void)
  67 {
  68 }                               /* nonempty for strict ANSI compilers */
  69 #endif /* USE_MY_MEMMOVE */