strlcat.c - sbase - suckless unix tools
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       ---
       strlcat.c (1814B)
       ---
            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 #include <string.h>
           18 #include <sys/types.h>
           19 
           20 #include "../util.h"
           21 
           22 /*
           23  * Appends src to string dst of size siz (unlike strncat, siz is the
           24  * full size of dst, not space left). At most siz-1 characters
           25  * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
           26  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
           27  * If retval >= siz, truncation occurred.
           28  */
           29 size_t
           30 strlcat(char *dst, const char *src, size_t siz)
           31 {
           32         char *d = dst;
           33         const char *s = src;
           34         size_t n = siz;
           35         size_t dlen;
           36         /* Find the end of dst and adjust bytes left but don't go past end */
           37         while (n-- != 0 && *d != '\0')
           38                 d++;
           39         dlen = d - dst;
           40         n = siz - dlen;
           41         if (n == 0)
           42                 return(dlen + strlen(s));
           43         while (*s != '\0') {
           44                 if (n != 1) {
           45                         *d++ = *s;
           46                         n--;
           47                 }
           48                 s++;
           49         }
           50         *d = '\0';
           51         return(dlen + (s - src)); /* count does not include NUL */
           52 }
           53 
           54 size_t
           55 estrlcat(char *dst, const char *src, size_t siz)
           56 {
           57         size_t ret;
           58 
           59         if ((ret = strlcat(dst, src, siz)) >= siz)
           60                 eprintf("strlcat: input string too long\n");
           61 
           62         return ret;
           63 }