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Annotation of prex-old/sys/lib/string.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 2005-2006, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * string.c - Minimum string library for kernel
        !            32:  */
        !            33:
        !            34: #include <sys/types.h>
        !            35:
        !            36: /*
        !            37:  * Safer version of strncpy
        !            38:  * The destination string is always terminated with NULL character.
        !            39:  */
        !            40: size_t
        !            41: strlcpy(char *dest, const char *src, size_t count)
        !            42: {
        !            43:        char *d = dest;
        !            44:        const char *s = src;
        !            45:        size_t n = count;
        !            46:
        !            47:        /* Copy as many bytes as will fit */
        !            48:        if (n != 0 && --n != 0) {
        !            49:                do {
        !            50:                        if ((*d++ = *s++) == 0)
        !            51:                                break;
        !            52:                } while (--n != 0);
        !            53:        }
        !            54:
        !            55:        /* Not enough room in dst, add NUL and traverse rest of src */
        !            56:        if (n == 0) {
        !            57:                if (count != 0)
        !            58:                        *d = '\0';              /* NUL-terminate dst */
        !            59:                while (*s++)
        !            60:                        ;
        !            61:        }
        !            62:
        !            63:        return (size_t)(s - src - 1);   /* count does not include NUL */
        !            64: }
        !            65:
        !            66: int
        !            67: strncmp(const char *src, const char *tgt, size_t count)
        !            68: {
        !            69:        register signed char res = 0;
        !            70:
        !            71:        while (count) {
        !            72:                if ((res = *src - *tgt++) != 0 || !*src++)
        !            73:                        break;
        !            74:                count--;
        !            75:        }
        !            76:        return res;
        !            77: }
        !            78:
        !            79: /* The returned size does not include the last NULL char */
        !            80: size_t
        !            81: strnlen(const char *str, size_t count)
        !            82: {
        !            83:        const char *tmp;
        !            84:
        !            85:        for (tmp = str; count-- && *tmp != '\0'; ++tmp);
        !            86:        return (size_t)(tmp - str);
        !            87: }
        !            88:
        !            89: void *
        !            90: memcpy(void *dest, const void *src, size_t count)
        !            91: {
        !            92:        char *tmp = (char *)dest, *s = (char *)src;
        !            93:
        !            94:        while (count--)
        !            95:                *tmp++ = *s++;
        !            96:
        !            97:        return dest;
        !            98: }
        !            99:
        !           100: void *
        !           101: memset(void *dest, int ch, size_t count)
        !           102: {
        !           103:        char *p = (char *)dest;
        !           104:
        !           105:        while (count--)
        !           106:                *p++ = (char)ch;
        !           107:
        !           108:        return dest;
        !           109: }