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Annotation of prex-old/sys/lib/string.c, Revision 1.1.1.1

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: }