Subversion Repositories HelenOS

Rev

Rev 4014 | Rev 4263 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
4011 svoboda 1 
/*
2 
 * Copyright (c) 2001-2004 Jakub Jermar
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 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
4014 decky 29 
/** @addtogroup generic
4011 svoboda 30 
 * @{
31 
 */
32 
 
33 
/**
34 
 * @file
4014 decky 35 
 * @brief Miscellaneous functions.
4011 svoboda 36 
 */
37 
 
38 
#include <string.h>
39 
#include <print.h>
40 
#include <cpu.h>
41 
#include <arch/asm.h>
42 
#include <arch.h>
43 
#include <console/kconsole.h>
44 
 
45 
/** Return number of characters in a string.
46 
 *
47 
 * @param str NULL terminated string.
48 
 *
49 
 * @return Number of characters in str.
4014 decky 50 
 *
4011 svoboda 51 
 */
52 
size_t strlen(const char *str)
53 
{
54 
    int i;
55 
 
4014 decky 56 
    for (i = 0; str[i]; i++);
4011 svoboda 57 
 
58 
    return i;
59 
}
60 
 
61 
/** Compare two NULL terminated strings
62 
 *
63 
 * Do a char-by-char comparison of two NULL terminated strings.
64 
 * The strings are considered equal iff they consist of the same
65 
 * characters on the minimum of their lengths.
66 
 *
67 
 * @param src First string to compare.
68 
 * @param dst Second string to compare.
69 
 *
70 
 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
71 
 *
72 
 */
73 
int strcmp(const char *src, const char *dst)
74 
{
75 
    for (; *src && *dst; src++, dst++) {
76 
        if (*src < *dst)
77 
            return -1;
78 
        if (*src > *dst)
79 
            return 1;
80 
    }
81 
    if (*src == *dst)
82 
        return 0;
4014 decky 83 
 
4011 svoboda 84 
    if (!*src)
85 
        return -1;
4014 decky 86 
 
4011 svoboda 87 
    return 1;
88 
}
89 
 
90 
 
91 
/** Compare two NULL terminated strings
92 
 *
93 
 * Do a char-by-char comparison of two NULL terminated strings.
94 
 * The strings are considered equal iff they consist of the same
95 
 * characters on the minimum of their lengths and specified maximal
96 
 * length.
97 
 *
98 
 * @param src First string to compare.
99 
 * @param dst Second string to compare.
100 
 * @param len Maximal length for comparison.
101 
 *
102 
 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
103 
 *
104 
 */
105 
int strncmp(const char *src, const char *dst, size_t len)
106 
{
107 
    unsigned int i;
108 
 
109 
    for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {
110 
        if (*src < *dst)
111 
            return -1;
4014 decky 112 
 
4011 svoboda 113 
        if (*src > *dst)
114 
            return 1;
115 
    }
4014 decky 116 
 
4011 svoboda 117 
    if (i == len || *src == *dst)
118 
        return 0;
4014 decky 119 
 
4011 svoboda 120 
    if (!*src)
121 
        return -1;
4014 decky 122 
 
4011 svoboda 123 
    return 1;
124 
}
125 
 
126 
 
127 
 
128 
/** Copy NULL terminated string.
129 
 *
130 
 * Copy at most 'len' characters from string 'src' to 'dest'.
131 
 * If 'src' is shorter than 'len', '\0' is inserted behind the
132 
 * last copied character.
133 
 *
4014 decky 134 
 * @param src  Source string.
4011 svoboda 135 
 * @param dest Destination buffer.
4014 decky 136 
 * @param len  Size of destination buffer.
137 
 *
4011 svoboda 138 
 */
139 
void strncpy(char *dest, const char *src, size_t len)
140 
{
141 
    unsigned int i;
4014 decky 142 
 
4011 svoboda 143 
    for (i = 0; i < len; i++) {
144 
        if (!(dest[i] = src[i]))
145 
            return;
146 
    }
4014 decky 147 
 
4011 svoboda 148 
    dest[i - 1] = '\0';
149 
}
150 
 
4012 svoboda 151 
/** Find first occurence of character in string.
152 
 *
4014 decky 153 
 * @param s String to search.
154 
 * @param i Character to look for.
4012 svoboda 155 
 *
4014 decky 156 
 * @return Pointer to character in @a s or NULL if not found.
4012 svoboda 157 
 */
158 
extern char *strchr(const char *s, int i)
159 
{
160 
    while (*s != '\0') {
4014 decky 161 
        if (*s == i)
162 
            return (char *) s;
4012 svoboda 163 
        ++s;
164 
    }
4014 decky 165 
 
4012 svoboda 166 
    return NULL;
167 
}
168 
 
4011 svoboda 169 
/** @}
170 
 */