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glibc  2.9
Functions
wcsncat.c File Reference
#include <wchar.h>

Go to the source code of this file.

Functions

wchar_t * wcsncat (wchar_t *dest, const wchar_t *src, size_t n)

Function Documentation

wchar_t* wcsncat ( wchar_t *  dest,
const wchar_t *  src,
size_t  n 
)

Definition at line 25 of file wcsncat.c.

{
  wchar_t c;
  wchar_t * const s = dest;

  /* Find the end of DEST.  */
  do
    c = *dest++;
  while (c != L'\0');

  /* Make DEST point before next character, so we can increment
     it while memory is read (wins on pipelined cpus).  */
  dest -= 2;

  if (n >= 4)
    {
      size_t n4 = n >> 2;
      do
       {
         c = *src++;
         *++dest = c;
         if (c == L'\0')
           return s;
         c = *src++;
         *++dest = c;
         if (c == L'\0')
           return s;
         c = *src++;
         *++dest = c;
         if (c == L'\0')
           return s;
         c = *src++;
         *++dest = c;
         if (c == L'\0')
           return s;
       } while (--n4 > 0);
      n &= 3;
    }

  while (n > 0)
    {
      c = *src++;
      *++dest = c;
      if (c == L'\0')
       return s;
      n--;
    }

  if (c != L'\0')
    *++dest = L'\0';

  return s;
}