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strlcpy.c (713B)
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1 /* Taken from OpenBSD */
2 #include <sys/types.h>
3 #include <string.h>
4
5 /*
6 * Copy src to string dst of size siz. At most siz-1 characters
7 * will be copied. Always NUL terminates (unless siz == 0).
8 * Returns strlen(src); if retval >= siz, truncation occurred.
9 */
10 size_t
11 strlcpy(char *dst, const char *src, size_t siz)
12 {
13 char *d = dst;
14 const char *s = src;
15 size_t n = siz;
16
17 /* Copy as many bytes as will fit */
18 if (n != 0) {
19 while (--n != 0) {
20 if ((*d++ = *s++) == '\0')
21 break;
22 }
23 }
24 /* Not enough room in dst, add NUL and traverse rest of src */
25 if (n == 0) {
26 if (siz != 0)
27 *d = '\0'; /* NUL-terminate dst */
28 while (*s++)
29 ;
30 }
31 return(s - src - 1); /* count does not include NUL */
32 }