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1881 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1881 jermar 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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#include <string.h>
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/**
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 * @file
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 * @brief   String manipulation functions.
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 */
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/** Return number of characters in a string.
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 *
3409 svoboda 42
 * @param str       NULL terminated string.
1881 jermar 43
 *
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 * @return      Number of characters in str.
1881 jermar 45
 */
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size_t strlen(const char *str)
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{
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    int i;
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    for (i = 0; str[i]; i++)
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        ;
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    return i;
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}
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3409 svoboda 56
/** Compare two NULL terminated strings.
1881 jermar 57
 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
1896 jermar 60
 * characters on the minimum of their lengths.
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 *
3409 svoboda 62
 * @param src       First string to compare.
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 * @param dst       Second string to compare.
1896 jermar 64
 *
3409 svoboda 65
 * @return      0 if the strings are equal, -1 if first is smaller,
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 *          1 if second smaller.
1896 jermar 67
 *
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 */
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int strcmp(const char *src, const char *dst)
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{
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    for (; *src && *dst; src++, dst++) {
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        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (*src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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84
 
3409 svoboda 85
/** Compare two NULL terminated strings.
1896 jermar 86
 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
1881 jermar 89
 * characters on the minimum of their lengths and specified maximal
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 * length.
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 *
3409 svoboda 92
 * @param src       First string to compare.
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 * @param dst       Second string to compare.
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 * @param len       Maximal length for comparison.
1881 jermar 95
 *
3409 svoboda 96
 * @return      0 if the strings are equal, -1 if first is smaller,
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 *          1 if second smaller.
1881 jermar 98
 *
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 */
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int strncmp(const char *src, const char *dst, size_t len)
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{
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    int i;
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1896 jermar 104
    for (i = 0; *src && *dst && i < len; src++, dst++, i++) {
1881 jermar 105
        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (i == len || *src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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117
/** Copy NULL terminated string.
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 *
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 * Copy at most 'len' characters from string 'src' to 'dest'.
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 * If 'src' is shorter than 'len', '\0' is inserted behind the
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 * last copied character.
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 *
3409 svoboda 123
 * @param src       Source string.
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 * @param dest      Destination buffer.
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 * @param len       Size of destination buffer.
1881 jermar 126
 */
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void strncpy(char *dest, const char *src, size_t len)
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{
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    int i;
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    for (i = 0; i < len; i++) {
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        if (!(dest[i] = src[i]))
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            return;
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    }
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    dest[i-1] = '\0';
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}
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3409 svoboda 137
/** Convert ascii representation to unative_t.
1881 jermar 138
 *
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 * Supports 0x for hexa & 0 for octal notation.
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 * Does not check for overflows, does not support negative numbers
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 *
3409 svoboda 142
 * @param text      Textual representation of number.
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 * @return      Converted number or 0 if no valid number found.
1881 jermar 144
 */
145
unative_t atoi(const char *text)
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{
147
    int base = 10;
148
    unative_t result = 0;
149
 
150
    if (text[0] == '0' && text[1] == 'x') {
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        base = 16;
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        text += 2;
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    } else if (text[0] == '0')
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        base = 8;
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156
    while (*text) {
3409 svoboda 157
        if (base != 16 &&
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            ((*text >= 'A' && *text <= 'F') ||
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            (*text >='a' && *text <='f')))
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            break;
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        if (base == 8 && *text >='8')
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            break;
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164
        if (*text >= '0' && *text <= '9') {
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            result *= base;
166
            result += *text - '0';
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        } else if (*text >= 'A' && *text <= 'F') {
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            result *= base;
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            result += *text - 'A' + 10;
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        } else if (*text >= 'a' && *text <= 'f') {
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            result *= base;
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            result += *text - 'a' + 10;
173
        } else
174
            break;
175
        text++;
176
    }
177
 
178
    return result;
179
}
180
 
3409 svoboda 181
/** Move piece of memory to another, possibly overlapping, location.
182
 *
183
 * @param dst       Destination address.
184
 * @param src       Source address.
185
 * @param len       Number of bytes to move.
186
 *
187
 * @return      Destination address.
188
 */
189
void *memmove(void *dst, const void *src, size_t len)
190
{
191
    char *d = dst;
192
    const char *s = src;
193
    if (s < d) {
194
        while (len--)
195
            *(d + len) = *(s + len);
196
    } else {
197
        while (len--)
198
            *d++ = *s++;
199
    }
200
 
201
    return dst;
202
}
203
 
1881 jermar 204
/** @}
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 */