Mercurial > gnulib
view lib/stpncpy.c @ 40132:6bcaf5dcb02b
fdatasync: Fix compilation error on Android 4.3.
* m4/fdatasync.m4 (gl_FUNC_FDATASYNC): On platforms other than Solaris,
test whether fdatasync() exists.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 25 Jan 2019 00:15:50 +0100 |
parents | b06060465f09 |
children |
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/* Copyright (C) 1993, 1995-1997, 2002-2003, 2005-2007, 2009-2019 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@gnu.org. 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 of the License, or 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, see <https://www.gnu.org/licenses/>. */ /* This is almost copied from strncpy.c, written by Torbjorn Granlund. */ #include <config.h> /* Specification. */ #include <string.h> #ifndef weak_alias # define __stpncpy stpncpy #endif /* Copy no more than N bytes of SRC to DST, returning a pointer past the last non-NUL byte written into DST. */ char * (__stpncpy) (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