1 /* -*- mode: c; c-file-style: "bsd"; indent-tabs-mode: t -*- */ 2 /* 3 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /* Provide strlcpy and strlcat for platforms that don't have them. */ 19 20 #include "k5-platform.h" 21 #include <sys/types.h> 22 #include <string.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 30 krb5int_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) { 38 while (--n != 0) { 39 if ((*d++ = *s++) == '\0') 40 break; 41 } 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 size_t 63 krb5int_strlcat(char *dst, const char *src, size_t siz) 64 { 65 char *d = dst; 66 const char *s = src; 67 size_t n = siz; 68 size_t dlen; 69 70 /* Find the end of dst and adjust bytes left but don't go past end */ 71 while (n-- != 0 && *d != '\0') 72 d++; 73 dlen = d - dst; 74 n = siz - dlen; 75 76 if (n == 0) 77 return(dlen + strlen(s)); 78 while (*s != '\0') { 79 if (n != 1) { 80 *d++ = *s; 81 n--; 82 } 83 s++; 84 } 85 *d = '\0'; 86 87 return(dlen + (s - src)); /* count does not include NUL */ 88 } 89