scoutos / prex-0.9.0 / bsp / boot / common / string.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009, Kohsuke Ohtani
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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 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * string.c - minimum string library
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32 | */
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33 | |||
34 | #include <boot.h> |
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35 | |||
36 | /*
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37 | * Convert string to long interger
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38 | * This version does not support minus value.
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39 | */
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40 | long
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41 | atol(const char *str) |
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42 | { |
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43 | long val = 0; |
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44 | |||
45 | while (*str == ' ') |
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46 | str++; |
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47 | while (*str >= '0' && *str <= '9') { |
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48 | val *= 10;
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49 | val += (long)(*str - '0'); |
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50 | str++; |
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51 | } |
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52 | return val;
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53 | } |
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54 | |||
55 | /*
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56 | * Safer version of strncpy
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57 | * The destination string is always terminated with NULL character.
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58 | */
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59 | size_t |
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60 | strlcpy(char *dest, const char *src, size_t count) |
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61 | { |
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62 | char *d = dest;
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63 | const char *s = src; |
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64 | size_t n = count; |
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65 | |||
66 | /* Copy as many bytes as will fit */
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67 | if (n != 0 && --n != 0) { |
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68 | do {
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69 | if ((*d++ = *s++) == 0) |
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70 | break;
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71 | } while (--n != 0); |
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72 | } |
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73 | |||
74 | /* Not enough room in dst, add NUL and traverse rest of src */
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75 | if (n == 0) { |
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76 | if (count != 0) |
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77 | *d = '\0'; /* NUL-terminate dst */ |
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78 | while (*s++)
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79 | ; |
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80 | } |
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81 | |||
82 | return (size_t)(s - src - 1); /* count does not include NUL */ |
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83 | } |
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84 | |||
85 | int
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86 | strncmp(const char *src, const char *tgt, size_t count) |
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87 | { |
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88 | signed char res = 0; |
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89 | |||
90 | while (count) {
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91 | if ((res = *src - *tgt++) != 0 || !*src++) |
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92 | break;
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93 | count--; |
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94 | } |
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95 | return res;
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96 | } |
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97 | |||
98 | void *
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99 | memcpy(void *dest, const void *src, size_t count) |
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100 | { |
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101 | char *tmp = (char *)dest, *s = (char *)src; |
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102 | |||
103 | while (count--)
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104 | *tmp++ = *s++; |
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105 | return dest;
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106 | } |
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107 | |||
108 | void *
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109 | memset(void *dest, int ch, size_t count) |
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110 | { |
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111 | char *p = (char *)dest; |
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112 | |||
113 | while (count--)
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114 | *p++ = (char)ch;
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115 | return dest;
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116 | } |