diff options
Diffstat (limited to 'lib/stpncpy.c')
| -rw-r--r-- | lib/stpncpy.c | 111 |
1 files changed, 57 insertions, 54 deletions
diff --git a/lib/stpncpy.c b/lib/stpncpy.c index 79a0811..d1422a9 100644 --- a/lib/stpncpy.c +++ b/lib/stpncpy.c @@ -1,89 +1,92 @@ -/* Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. +/* Copyright (C) 1993, 1995-1997, 2002-2003, 2005-2007, 2009-2023 Free Software + * Foundation, Inc. -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 3, or (at your option) -any later version. + NOTE: The canonical source of this file is maintained with the GNU C Library. + Bugs can be reported to bug-glibc@gnu.org. -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. + This file is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. -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 file 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ /* This is almost copied from strncpy.c, written by Torbjorn Granlund. */ -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif +#include <config.h> -#include <sys/types.h> +/* Specification. */ +#include <string.h> +#ifndef weak_alias +# define __stpncpy stpncpy +#endif -/* Copy no more than N characters of SRC to DEST, returning the address of - the last character written into DEST. */ +/* Copy no more than N bytes of SRC to DST, returning a pointer past the + last non-NUL byte written into DST. */ char * -stpncpy (dest, src, n) - char *dest; - const char *src; - size_t n; +(__stpncpy) (char *dest, const char *src, size_t n) { 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 + 1; + { + 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 + 1; + return dest; - do + for (;;) { c = *src++; - *++dest = c; - if (--n == 0) - return dest + 1; + --n; + *dest++ = c; + if (c == '\0') + break; + if (n == 0) + return dest; } - while (c != '\0'); zero_fill: while (n-- > 0) dest[n] = '\0'; - return dest; + return dest - 1; } +#ifdef weak_alias +weak_alias (__stpncpy, stpncpy) +#endif |