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Annotation of mandoc/compat.c, Revision 1.1

1.1     ! kristaps    1: /*     $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $      */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1998 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 <sys/types.h>
        !            20: #include <string.h>
        !            21:
        !            22: #ifdef __linux__
        !            23:
        !            24: /*
        !            25:  * Appends src to string dst of size siz (unlike strncat, siz is the
        !            26:  * full size of dst, not space left).  At most siz-1 characters
        !            27:  * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
        !            28:  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
        !            29:  * If retval >= siz, truncation occurred.
        !            30:  */
        !            31: size_t
        !            32: strlcat(char *dst, const char *src, size_t siz)
        !            33: {
        !            34:        char *d = dst;
        !            35:        const char *s = src;
        !            36:        size_t n = siz;
        !            37:        size_t dlen;
        !            38:
        !            39:        /* Find the end of dst and adjust bytes left but don't go past end */
        !            40:        while (n-- != 0 && *d != '\0')
        !            41:                d++;
        !            42:        dlen = d - dst;
        !            43:        n = siz - dlen;
        !            44:
        !            45:        if (n == 0)
        !            46:                return(dlen + strlen(s));
        !            47:        while (*s != '\0') {
        !            48:                if (n != 1) {
        !            49:                        *d++ = *s;
        !            50:                        n--;
        !            51:                }
        !            52:                s++;
        !            53:        }
        !            54:        *d = '\0';
        !            55:
        !            56:        return(dlen + (s - src));       /* count does not include NUL */
        !            57: }
        !            58:
        !            59:
        !            60: /*
        !            61:  * Copy src to string dst of size siz.  At most siz-1 characters
        !            62:  * will be copied.  Always NUL terminates (unless siz == 0).
        !            63:  * Returns strlen(src); if retval >= siz, truncation occurred.
        !            64:  */
        !            65: size_t
        !            66: strlcpy(char *dst, const char *src, size_t siz)
        !            67: {
        !            68:        char *d = dst;
        !            69:        const char *s = src;
        !            70:        size_t n = siz;
        !            71:
        !            72:        /* Copy as many bytes as will fit */
        !            73:        if (n != 0) {
        !            74:                while (--n != 0) {
        !            75:                        if ((*d++ = *s++) == '\0')
        !            76:                                break;
        !            77:                }
        !            78:        }
        !            79:
        !            80:        /* Not enough room in dst, add NUL and traverse rest of src */
        !            81:        if (n == 0) {
        !            82:                if (siz != 0)
        !            83:                        *d = '\0';              /* NUL-terminate dst */
        !            84:                while (*s++)
        !            85:                        ;
        !            86:        }
        !            87:
        !            88:        return(s - src - 1);    /* count does not include NUL */
        !            89: }
        !            90: #endif /*__linux__*/