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
17 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c and lib/libc/string/strlcat.c */
18
19 /* strlcpy and strlcat modified for use by ghostscript */
20
21 #include "string_.h"
22 #include "gsstrl.h"
23
24 /*
25 * Copy src to string dst of size siz. At most siz-1 characters
26 * will be copied. Always NUL terminates (unless siz == 0).
27 * Returns strlen(src); if retval >= siz, truncation occurred.
28 */
29 size_t
gs_strlcpy(char * dst,const char * src,size_t siz)30 gs_strlcpy(char *dst, const char *src, size_t siz)
31 {
32 char *d = dst;
33 const char *s = src;
34 size_t n = siz;
35
36 /* Copy as many bytes as will fit */
37 if (n != 0 && --n != 0) {
38 do {
39 if ((*d++ = *s++) == 0)
40 break;
41 } while (--n != 0);
42 }
43
44 /* Not enough room in dst, add NUL and traverse rest of src */
45 if (n == 0) {
46 if (siz != 0)
47 *d = '\0'; /* NUL-terminate dst */
48 while (*s++)
49 ;
50 }
51
52 return(s - src - 1); /* count does not include NUL */
53 }
54
55 /*
56 * Appends src to string dst of size siz (unlike strncat, siz is the
57 * full size of dst, not space left). At most siz-1 characters
58 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
59 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
60 * If retval >= siz, truncation occurred.
61 */
62
63 size_t
gs_strlcat(char * dst,const char * src,size_t siz)64 gs_strlcat(char *dst, const char *src, size_t siz)
65 {
66 char *d = dst;
67 const char *s = src;
68 size_t n = siz;
69 size_t dlen;
70
71 /* Find the end of dst and adjust bytes left but don't go past end */
72 while (n-- != 0 && *d != '\0')
73 d++;
74 dlen = d - dst;
75 n = siz - dlen;
76
77 if (n == 0)
78 return(dlen + strlen(s));
79 while (*s != '\0') {
80 if (n != 1) {
81 *d++ = *s;
82 n--;
83 }
84 s++;
85 }
86 *d = '\0';
87
88 return(dlen + (s - src)); /* count does not include NUL */
89 }
90