diff options
Diffstat (limited to 'lib/stpncpy.c')
-rw-r--r-- | lib/stpncpy.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/lib/stpncpy.c b/lib/stpncpy.c new file mode 100644 index 0000000..fcbdfe5 --- /dev/null +++ b/lib/stpncpy.c @@ -0,0 +1,101 @@ +/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc. + + NOTE: The canonical source of this file is maintained with the GNU C Library. + Bugs can be reported to bug-glibc@prep.ai.mit.edu. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. */ + +/* This is almost copied from strncpy.c, written by Torbjorn Granlund. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#ifdef _LIBC +# include <string.h> +#else +# include <sys/types.h> +#endif + +#ifndef weak_alias +# define __stpncpy stpncpy +#endif + +/* Copy no more than N characters of SRC to DEST, returning the address of + the terminating '\0' in DEST, if any, or else DEST + N. */ +char * +__stpncpy (dest, src, n) + char *dest; + const char *src; + size_t n; +{ + char c; + char *s = 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 -= dest - s; + goto zero_fill; + } + + last_chars: + n &= 3; + if (n == 0) + return dest; + + for (;;) + { + c = *src++; + --n; + *dest++ = c; + if (c == '\0') + break; + if (n == 0) + return dest; + } + + zero_fill: + while (n-- > 0) + dest[n] = '\0'; + + return dest - 1; +} +#ifdef weak_alias +weak_alias (__stpncpy, stpncpy) +#endif |