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1 12042ad7 2021-01-21 op /*
2 12042ad7 2021-01-21 op * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
3 12042ad7 2021-01-21 op *
4 12042ad7 2021-01-21 op * Permission to use, copy, modify, and distribute this software for any
5 12042ad7 2021-01-21 op * purpose with or without fee is hereby granted, provided that the above
6 12042ad7 2021-01-21 op * copyright notice and this permission notice appear in all copies.
7 12042ad7 2021-01-21 op *
8 12042ad7 2021-01-21 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 12042ad7 2021-01-21 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 12042ad7 2021-01-21 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 12042ad7 2021-01-21 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 12042ad7 2021-01-21 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 12042ad7 2021-01-21 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 12042ad7 2021-01-21 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 12042ad7 2021-01-21 op */
16 12042ad7 2021-01-21 op
17 76898714 2021-02-12 op #include "../config.h"
18 76898714 2021-02-12 op
19 12042ad7 2021-01-21 op #include <sys/types.h>
20 12042ad7 2021-01-21 op #include <string.h>
21 12042ad7 2021-01-21 op
22 12042ad7 2021-01-21 op /*
23 12042ad7 2021-01-21 op * Appends src to string dst of size dsize (unlike strncat, dsize is the
24 12042ad7 2021-01-21 op * full size of dst, not space left). At most dsize-1 characters
25 12042ad7 2021-01-21 op * will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
26 12042ad7 2021-01-21 op * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
27 12042ad7 2021-01-21 op * If retval >= dsize, truncation occurred.
28 12042ad7 2021-01-21 op */
29 12042ad7 2021-01-21 op size_t
30 12042ad7 2021-01-21 op strlcat(char *dst, const char *src, size_t dsize)
31 12042ad7 2021-01-21 op {
32 12042ad7 2021-01-21 op const char *odst = dst;
33 12042ad7 2021-01-21 op const char *osrc = src;
34 12042ad7 2021-01-21 op size_t n = dsize;
35 12042ad7 2021-01-21 op size_t dlen;
36 12042ad7 2021-01-21 op
37 12042ad7 2021-01-21 op /* Find the end of dst and adjust bytes left but don't go past end. */
38 12042ad7 2021-01-21 op while (n-- != 0 && *dst != '\0')
39 12042ad7 2021-01-21 op dst++;
40 12042ad7 2021-01-21 op dlen = dst - odst;
41 12042ad7 2021-01-21 op n = dsize - dlen;
42 12042ad7 2021-01-21 op
43 12042ad7 2021-01-21 op if (n-- == 0)
44 12042ad7 2021-01-21 op return(dlen + strlen(src));
45 12042ad7 2021-01-21 op while (*src != '\0') {
46 12042ad7 2021-01-21 op if (n != 0) {
47 12042ad7 2021-01-21 op *dst++ = *src;
48 12042ad7 2021-01-21 op n--;
49 12042ad7 2021-01-21 op }
50 12042ad7 2021-01-21 op src++;
51 12042ad7 2021-01-21 op }
52 12042ad7 2021-01-21 op *dst = '\0';
53 12042ad7 2021-01-21 op
54 12042ad7 2021-01-21 op return(dlen + (src - osrc)); /* count does not include NUL */
55 12042ad7 2021-01-21 op }