tstrlcpy.c - stopwatch - simple timer for console or x root window
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       tstrlcpy.c (1576B)
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            1 /*        $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $        */
            2 
            3 /*
            4  * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
            5  *
            6  * Permission to use, copy, modify, and distribute this software for any
            7  * purpose with or without fee is hereby granted, provided that the above
            8  * copyright notice and this permission notice appear in all copies.
            9  *
           10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
           11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           17  */
           18 
           19 #include <string.h>
           20 
           21 /*
           22  * Copy string src to buffer dst of size dsize.  At most dsize-1
           23  * chars will be copied.  Always NUL terminates (unless dsize == 0).
           24  * Returns strlen(src); if retval >= dsize, truncation occurred.
           25  */
           26 size_t
           27 strlcpy(char *dst, const char *src, size_t dsize)
           28 {
           29         const char *osrc = src;
           30         size_t nleft = dsize;
           31 
           32         /* Copy as many bytes as will fit. */
           33         if (nleft != 0) {
           34                 while (--nleft != 0) {
           35                         if ((*dst++ = *src++) == '\0')
           36                                 break;
           37                 }
           38         }
           39 
           40         /* Not enough room in dst, add NUL and traverse rest of src. */
           41         if (nleft == 0) {
           42                 if (dsize != 0)
           43                         *dst = '\0';                /* NUL-terminate dst */
           44                 while (*src++)
           45                         ;
           46         }
           47 
           48         return(src - osrc - 1);        /* count does not include NUL */
           49 }