1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #if defined(LIBC_SCCS) && !defined(lint) 12 static char sccsid[] = "@(#)strncpy.c 8.1 (Berkeley) 06/04/93"; 13 #endif /* LIBC_SCCS and not lint */ 14 15 #include <sys/cdefs.h> 16 #include <string.h> 17 18 /* 19 * Copy src to dst, truncating or null-padding to always copy n bytes. 20 * Return dst. 21 */ 22 char * 23 strncpy(dst, src, n) 24 char *dst; 25 const char *src; 26 register size_t n; 27 { 28 if (n != 0) { 29 register char *d = dst; 30 register const char *s = src; 31 32 do { 33 if ((*d++ = *s++) == 0) { 34 /* NUL pad the remaining n-1 bytes */ 35 while (--n != 0) 36 *d++ = 0; 37 break; 38 } 39 } while (--n != 0); 40 } 41 return (dst); 42 } 43