Martin Cottrell / microbit-dal

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Dependencies:   BLE_API mbed-dev-bin nRF51822

Dependents:   microbit

Fork of microbit-dal by Lancaster University

source/core/MicroBitCompat.cpp@75:ae9a17da71af, 2017-01-13 (annotated)

Committer:
Asimov
Date:
Fri Jan 13 21:14:06 2017 +0000
Revision:
75:ae9a17da71af
Parent:
1:8aa5cdb4ab67 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 /**
Jonathan Austin 1:8aa5cdb4ab67 27 * This file contains functions used to maintain compatability and portability.
Jonathan Austin 1:8aa5cdb4ab67 28 * It also contains constants that are used elsewhere in the DAL.
Jonathan Austin 1:8aa5cdb4ab67 29 */
Jonathan Austin 1:8aa5cdb4ab67 30 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 31 #include "MicroBitCompat.h"
Jonathan Austin 1:8aa5cdb4ab67 32 #include "ErrorNo.h"
Jonathan Austin 1:8aa5cdb4ab67 33
Jonathan Austin 1:8aa5cdb4ab67 34
Jonathan Austin 1:8aa5cdb4ab67 35 /**
Jonathan Austin 1:8aa5cdb4ab67 36 * Performs an in buffer reverse of a given char array.
Jonathan Austin 1:8aa5cdb4ab67 37 *
Jonathan Austin 1:8aa5cdb4ab67 38 * @param s the string to reverse.
Jonathan Austin 1:8aa5cdb4ab67 39 *
Jonathan Austin 1:8aa5cdb4ab67 40 * @return MICROBIT_OK, or MICROBIT_INVALID_PARAMETER.
Jonathan Austin 1:8aa5cdb4ab67 41 */
Jonathan Austin 1:8aa5cdb4ab67 42 int string_reverse(char *s)
Jonathan Austin 1:8aa5cdb4ab67 43 {
Jonathan Austin 1:8aa5cdb4ab67 44 //sanity check...
Jonathan Austin 1:8aa5cdb4ab67 45 if(s == NULL)
Jonathan Austin 1:8aa5cdb4ab67 46 return MICROBIT_INVALID_PARAMETER;
Jonathan Austin 1:8aa5cdb4ab67 47
Jonathan Austin 1:8aa5cdb4ab67 48 char *j;
Jonathan Austin 1:8aa5cdb4ab67 49 int c;
Jonathan Austin 1:8aa5cdb4ab67 50
Jonathan Austin 1:8aa5cdb4ab67 51 j = s + strlen(s) - 1;
Jonathan Austin 1:8aa5cdb4ab67 52
Jonathan Austin 1:8aa5cdb4ab67 53 while(s < j)
Jonathan Austin 1:8aa5cdb4ab67 54 {
Jonathan Austin 1:8aa5cdb4ab67 55 c = *s;
Jonathan Austin 1:8aa5cdb4ab67 56 *s++ = *j;
Jonathan Austin 1:8aa5cdb4ab67 57 *j-- = c;
Jonathan Austin 1:8aa5cdb4ab67 58 }
Jonathan Austin 1:8aa5cdb4ab67 59
Jonathan Austin 1:8aa5cdb4ab67 60 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 61 }
Jonathan Austin 1:8aa5cdb4ab67 62
Jonathan Austin 1:8aa5cdb4ab67 63 /**
Jonathan Austin 1:8aa5cdb4ab67 64 * Converts a given integer into a string representation.
Jonathan Austin 1:8aa5cdb4ab67 65 *
Jonathan Austin 1:8aa5cdb4ab67 66 * @param n The number to convert.
Jonathan Austin 1:8aa5cdb4ab67 67 *
Jonathan Austin 1:8aa5cdb4ab67 68 * @param s A pointer to the buffer where the resulting string will be stored.
Jonathan Austin 1:8aa5cdb4ab67 69 *
Jonathan Austin 1:8aa5cdb4ab67 70 * @return MICROBIT_OK, or MICROBIT_INVALID_PARAMETER.
Jonathan Austin 1:8aa5cdb4ab67 71 */
Jonathan Austin 1:8aa5cdb4ab67 72 int itoa(int n, char *s)
Jonathan Austin 1:8aa5cdb4ab67 73 {
Jonathan Austin 1:8aa5cdb4ab67 74 int i = 0;
Jonathan Austin 1:8aa5cdb4ab67 75 int positive = (n >= 0);
Jonathan Austin 1:8aa5cdb4ab67 76
Jonathan Austin 1:8aa5cdb4ab67 77 if (s == NULL)
Jonathan Austin 1:8aa5cdb4ab67 78 return MICROBIT_INVALID_PARAMETER;
Jonathan Austin 1:8aa5cdb4ab67 79
Jonathan Austin 1:8aa5cdb4ab67 80 // Record the sign of the number,
Jonathan Austin 1:8aa5cdb4ab67 81 // Ensure our working value is positive.
Jonathan Austin 1:8aa5cdb4ab67 82 if (positive)
Jonathan Austin 1:8aa5cdb4ab67 83 n = -n;
Jonathan Austin 1:8aa5cdb4ab67 84
Jonathan Austin 1:8aa5cdb4ab67 85 // Calculate each character, starting with the LSB.
Jonathan Austin 1:8aa5cdb4ab67 86 do {
Jonathan Austin 1:8aa5cdb4ab67 87 s[i++] = abs(n % 10) + '0';
Jonathan Austin 1:8aa5cdb4ab67 88 } while (abs(n /= 10) > 0);
Jonathan Austin 1:8aa5cdb4ab67 89
Jonathan Austin 1:8aa5cdb4ab67 90 // Add a negative sign as needed
Jonathan Austin 1:8aa5cdb4ab67 91 if (!positive)
Jonathan Austin 1:8aa5cdb4ab67 92 s[i++] = '-';
Jonathan Austin 1:8aa5cdb4ab67 93
Jonathan Austin 1:8aa5cdb4ab67 94 // Terminate the string.
Jonathan Austin 1:8aa5cdb4ab67 95 s[i] = '\0';
Jonathan Austin 1:8aa5cdb4ab67 96
Jonathan Austin 1:8aa5cdb4ab67 97 // Flip the order.
Jonathan Austin 1:8aa5cdb4ab67 98 string_reverse(s);
Jonathan Austin 1:8aa5cdb4ab67 99
Jonathan Austin 1:8aa5cdb4ab67 100 return MICROBIT_OK;
Jonathan Austin 1:8aa5cdb4ab67 101 }