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: }
CVSweb