From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- sysdeps/generic/stpncpy.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 89 insertions(+) create mode 100644 sysdeps/generic/stpncpy.c (limited to 'sysdeps/generic/stpncpy.c') diff --git a/sysdeps/generic/stpncpy.c b/sysdeps/generic/stpncpy.c new file mode 100644 index 0000000000..40c9173477 --- /dev/null +++ b/sysdeps/generic/stpncpy.c @@ -0,0 +1,89 @@ +/* Copyright (C) 1993, 1995 Free Software Foundation, Inc. +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +/* This is almost copied from strncpy.c, written by Torbjorn Granlund. */ + +#include +#include +#include + + +/* Copy no more than N characters of SRC to DEST, returning the address of + the last character written into DEST. */ +char * +DEFUN(__stpncpy, (dest, src, n), char *dest AND CONST char *src AND size_t n) +{ + reg_char c; + char *s = dest; + + --dest; + + if (n >= 4) + { + size_t n4 = n >> 2; + + for (;;) + { + c = *src++; + *++dest = c; + if (c == '\0') + break; + c = *src++; + *++dest = c; + if (c == '\0') + break; + c = *src++; + *++dest = c; + if (c == '\0') + break; + c = *src++; + *++dest = c; + if (c == '\0') + break; + if (--n4 == 0) + goto last_chars; + } + n = n - (dest - s) - 1; + if (n == 0) + return dest; + goto zero_fill; + } + + last_chars: + n &= 3; + if (n == 0) + return s; + + do + { + c = *src++; + *++dest = c; + if (--n == 0) + return dest; + } + while (c != '\0'); + + zero_fill: + do + *++dest = '\0'; + while (--n > 0); + + return dest; +} + +weak_alias (__stpncpy, stpncpy) -- cgit v1.2.3