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| 4011 | svoboda | 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 | /** |
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| 34 | * @file |
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| 35 | * @brief Miscellaneous functions. |
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| 36 | */ |
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| 37 | |||
| 38 | #include <string.h> |
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| 39 | #include <print.h> |
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| 40 | #include <cpu.h> |
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| 41 | #include <arch/asm.h> |
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| 42 | #include <arch.h> |
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| 43 | #include <console/kconsole.h> |
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| 44 | |||
| 45 | /** Return number of characters in a string. |
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| 46 | * |
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| 47 | * @param str NULL terminated string. |
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| 48 | * |
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| 49 | * @return Number of characters in str. |
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| 50 | */ |
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| 51 | size_t strlen(const char *str) |
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| 52 | { |
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| 53 | int i; |
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| 54 | |||
| 55 | for (i = 0; str[i]; i++) |
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| 56 | ; |
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| 57 | |||
| 58 | return i; |
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| 59 | } |
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| 60 | |||
| 61 | /** Compare two NULL terminated strings |
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| 62 | * |
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| 63 | * Do a char-by-char comparison of two NULL terminated strings. |
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| 64 | * The strings are considered equal iff they consist of the same |
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| 65 | * characters on the minimum of their lengths. |
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| 66 | * |
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| 67 | * @param src First string to compare. |
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| 68 | * @param dst Second string to compare. |
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| 69 | * |
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| 70 | * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller. |
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| 71 | * |
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| 72 | */ |
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| 73 | int strcmp(const char *src, const char *dst) |
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| 74 | { |
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| 75 | for (; *src && *dst; src++, dst++) { |
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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 (*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 | |||
| 89 | /** Compare two NULL terminated strings |
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| 90 | * |
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| 91 | * Do a char-by-char comparison of two NULL terminated strings. |
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| 92 | * The strings are considered equal iff they consist of the same |
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| 93 | * characters on the minimum of their lengths and specified maximal |
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| 94 | * length. |
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| 95 | * |
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| 96 | * @param src First string to compare. |
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| 97 | * @param dst Second string to compare. |
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| 98 | * @param len Maximal length for comparison. |
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| 99 | * |
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| 100 | * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller. |
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| 101 | * |
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| 102 | */ |
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| 103 | int strncmp(const char *src, const char *dst, size_t len) |
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| 104 | { |
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| 105 | unsigned int i; |
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| 106 | |||
| 107 | for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) { |
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| 108 | if (*src < *dst) |
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| 109 | return -1; |
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| 110 | if (*src > *dst) |
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| 111 | return 1; |
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| 112 | } |
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| 113 | if (i == len || *src == *dst) |
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| 114 | return 0; |
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| 115 | if (!*src) |
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| 116 | return -1; |
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| 117 | return 1; |
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| 118 | } |
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| 119 | |||
| 120 | |||
| 121 | |||
| 122 | /** Copy NULL terminated string. |
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| 123 | * |
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| 124 | * Copy at most 'len' characters from string 'src' to 'dest'. |
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| 125 | * If 'src' is shorter than 'len', '\0' is inserted behind the |
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| 126 | * last copied character. |
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| 127 | * |
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| 128 | * @param src Source string. |
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| 129 | * @param dest Destination buffer. |
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| 130 | * @param len Size of destination buffer. |
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| 131 | */ |
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| 132 | void strncpy(char *dest, const char *src, size_t len) |
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| 133 | { |
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| 134 | unsigned int i; |
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| 135 | |||
| 136 | for (i = 0; i < len; i++) { |
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| 137 | if (!(dest[i] = src[i])) |
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| 138 | return; |
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| 139 | } |
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| 140 | |||
| 141 | dest[i - 1] = '\0'; |
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| 142 | } |
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| 143 | |||
| 144 | /** Copy string. |
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| 145 | * |
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| 146 | * Copy string from src address to dst address. The copying is done |
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| 147 | * char-by-char until the null character. The source and destination memory |
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| 148 | * areas cannot overlap. |
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| 149 | * |
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| 150 | * @param src Source string to copy from. |
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| 151 | * @param dst Destination string to copy to. |
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| 152 | * |
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| 153 | * @return Address of the destination string. |
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| 154 | */ |
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| 155 | char *strcpy(char *dest, const char *src) |
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| 156 | { |
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| 157 | char *orig = dest; |
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| 158 | |||
| 159 | while ((*dest++ = *src++) != '\0'); |
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| 160 | |||
| 161 | return orig; |
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| 162 | } |
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| 163 | |||
| 164 | /** @} |
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| 165 | */ |