Annotation of sys/lib/libkern/strlcpy.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: strlcpy.c,v 1.5 2004/08/07 00:38:33 deraadt Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #if defined(LIBC_SCCS) && !defined(lint)
! 20: static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2004/08/07 00:38:33 deraadt Exp $";
! 21: #endif /* LIBC_SCCS and not lint */
! 22:
! 23: #if !defined(_KERNEL) && !defined(_STANDALONE)
! 24: #include <sys/types.h>
! 25: #include <string.h>
! 26: #else
! 27: #include <lib/libkern/libkern.h>
! 28: #endif
! 29:
! 30: /*
! 31: * Copy src to string dst of size siz. At most siz-1 characters
! 32: * will be copied. Always NUL terminates (unless siz == 0).
! 33: * Returns strlen(src); if retval >= siz, truncation occurred.
! 34: */
! 35: size_t
! 36: strlcpy(char *dst, const char *src, size_t siz)
! 37: {
! 38: char *d = dst;
! 39: const char *s = src;
! 40: size_t n = siz;
! 41:
! 42: /* Copy as many bytes as will fit */
! 43: if (n != 0 && --n != 0) {
! 44: do {
! 45: if ((*d++ = *s++) == 0)
! 46: break;
! 47: } while (--n != 0);
! 48: }
! 49:
! 50: /* Not enough room in dst, add NUL and traverse rest of src */
! 51: if (n == 0) {
! 52: if (siz != 0)
! 53: *d = '\0'; /* NUL-terminate dst */
! 54: while (*s++)
! 55: ;
! 56: }
! 57:
! 58: return(s - src - 1); /* count does not include NUL */
! 59: }
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