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strlcpy.h (1565B)


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