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| 1881 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup generic |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 33 | #include <string.h> |
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| 34 | |||
| 35 | /** |
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| 36 | * @file |
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| 37 | * @brief String manipulation functions. |
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| 38 | */ |
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| 39 | |||
| 40 | /** Return number of characters in a string. |
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| 41 | * |
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| 42 | * @param str NULL terminated string. |
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| 43 | * |
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| 44 | * @return Number of characters in str. |
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| 45 | */ |
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| 46 | size_t strlen(const char *str) |
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| 47 | { |
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| 48 | int i; |
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| 49 | |||
| 50 | for (i = 0; str[i]; i++) |
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| 51 | ; |
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| 52 | |||
| 53 | return i; |
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| 54 | } |
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| 55 | |||
| 56 | /** Compare two NULL terminated strings |
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| 57 | * |
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| 58 | * Do a char-by-char comparison of two NULL terminated strings. |
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| 59 | * The strings are considered equal iff they consist of the same |
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| 60 | * characters on the minimum of their lengths and specified maximal |
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| 61 | * length. |
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| 62 | * |
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| 63 | * @param src First string to compare. |
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| 64 | * @param dst Second string to compare. |
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| 65 | * @param len Maximal length for comparison. |
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| 66 | * |
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| 67 | * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller. |
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| 68 | * |
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| 69 | */ |
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| 70 | int strncmp(const char *src, const char *dst, size_t len) |
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| 71 | { |
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| 72 | int i; |
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| 73 | |||
| 74 | i = 0; |
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| 75 | for (;*src && *dst && i < len;src++,dst++,i++) { |
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| 76 | if (*src < *dst) |
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| 77 | return -1; |
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| 78 | if (*src > *dst) |
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| 79 | return 1; |
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| 80 | } |
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| 81 | if (i == len || *src == *dst) |
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| 82 | return 0; |
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| 83 | if (!*src) |
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| 84 | return -1; |
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| 85 | return 1; |
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| 86 | } |
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| 87 | |||
| 88 | /** Copy NULL terminated string. |
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| 89 | * |
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| 90 | * Copy at most 'len' characters from string 'src' to 'dest'. |
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| 91 | * If 'src' is shorter than 'len', '\0' is inserted behind the |
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| 92 | * last copied character. |
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| 93 | * |
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| 94 | * @param src Source string. |
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| 95 | * @param dest Destination buffer. |
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| 96 | * @param len Size of destination buffer. |
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| 97 | */ |
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| 98 | void strncpy(char *dest, const char *src, size_t len) |
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| 99 | { |
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| 100 | int i; |
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| 101 | for (i = 0; i < len; i++) { |
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| 102 | if (!(dest[i] = src[i])) |
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| 103 | return; |
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| 104 | } |
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| 105 | dest[i-1] = '\0'; |
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| 106 | } |
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| 107 | |||
| 108 | /** Convert ascii representation to unative_t |
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| 109 | * |
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| 110 | * Supports 0x for hexa & 0 for octal notation. |
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| 111 | * Does not check for overflows, does not support negative numbers |
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| 112 | * |
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| 113 | * @param text Textual representation of number |
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| 114 | * @return Converted number or 0 if no valid number ofund |
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| 115 | */ |
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| 116 | unative_t atoi(const char *text) |
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| 117 | { |
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| 118 | int base = 10; |
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| 119 | unative_t result = 0; |
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| 120 | |||
| 121 | if (text[0] == '0' && text[1] == 'x') { |
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| 122 | base = 16; |
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| 123 | text += 2; |
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| 124 | } else if (text[0] == '0') |
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| 125 | base = 8; |
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| 126 | |||
| 127 | while (*text) { |
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| 128 | if (base != 16 && \ |
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| 129 | ((*text >= 'A' && *text <= 'F' ) |
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| 130 | || (*text >='a' && *text <='f'))) |
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| 131 | break; |
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| 132 | if (base == 8 && *text >='8') |
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| 133 | break; |
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| 134 | |||
| 135 | if (*text >= '0' && *text <= '9') { |
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| 136 | result *= base; |
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| 137 | result += *text - '0'; |
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| 138 | } else if (*text >= 'A' && *text <= 'F') { |
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| 139 | result *= base; |
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| 140 | result += *text - 'A' + 10; |
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| 141 | } else if (*text >= 'a' && *text <= 'f') { |
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| 142 | result *= base; |
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| 143 | result += *text - 'a' + 10; |
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| 144 | } else |
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| 145 | break; |
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| 146 | text++; |
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| 147 | } |
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| 148 | |||
| 149 | return result; |
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| 150 | } |
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| 151 | |||
| 152 | /** @} |
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| 153 | */ |