Statistics
| Branch: | Revision:

scoutos / prex-0.9.0 / bsp / boot / common / string.c @ 03e9c04a

History | View | Annotate | Download (2.88 KB)

1
/*-
2
 * Copyright (c) 2005-2009, 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
32
 */
33

    
34
#include <boot.h>
35

    
36
/*
37
 * Convert string to long interger
38
 * This version does not support minus value.
39
 */
40
long
41
atol(const char *str)
42
{
43
        long val = 0;
44

    
45
        while (*str == ' ')
46
                str++;
47
        while (*str >= '0' && *str <= '9') {
48
                val *= 10;
49
                val += (long)(*str - '0');
50
                str++;
51
        }
52
        return val;
53
}
54

    
55
/*
56
 * Safer version of strncpy
57
 * The destination string is always terminated with NULL character.
58
 */
59
size_t
60
strlcpy(char *dest, const char *src, size_t count)
61
{
62
        char *d = dest;
63
        const char *s = src;
64
        size_t n = count;
65

    
66
        /* Copy as many bytes as will fit */
67
        if (n != 0 && --n != 0) {
68
                do {
69
                        if ((*d++ = *s++) == 0)
70
                                break;
71
                } while (--n != 0);
72
        }
73

    
74
        /* Not enough room in dst, add NUL and traverse rest of src */
75
        if (n == 0) {
76
                if (count != 0)
77
                        *d = '\0';                /* NUL-terminate dst */
78
                while (*s++)
79
                        ;
80
        }
81

    
82
        return (size_t)(s - src - 1);        /* count does not include NUL */
83
}
84

    
85
int
86
strncmp(const char *src, const char *tgt, size_t count)
87
{
88
        signed char res = 0;
89

    
90
        while (count) {
91
                if ((res = *src - *tgt++) != 0 || !*src++)
92
                        break;
93
                count--;
94
        }
95
        return res;
96
}
97

    
98
void *
99
memcpy(void *dest, const void *src, size_t count)
100
{
101
        char *tmp = (char *)dest, *s = (char *)src;
102

    
103
        while (count--)
104
                *tmp++ = *s++;
105
        return dest;
106
}
107

    
108
void *
109
memset(void *dest, int ch, size_t count)
110
{
111
        char *p = (char *)dest;
112

    
113
        while (count--)
114
                *p++ = (char)ch;
115
        return dest;
116
}