| 1 | /* |
| 2 | |
| 3 | u8x8_u8toa.c |
| 4 | |
| 5 | Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) |
| 6 | |
| 7 | Copyright (c) 2016, olikraus@gmail.com |
| 8 | All rights reserved. |
| 9 | |
| 10 | Redistribution and use in source and binary forms, with or without modification, |
| 11 | are permitted provided that the following conditions are met: |
| 12 | |
| 13 | * Redistributions of source code must retain the above copyright notice, this list |
| 14 | of conditions and the following disclaimer. |
| 15 | |
| 16 | * Redistributions in binary form must reproduce the above copyright notice, this |
| 17 | list of conditions and the following disclaimer in the documentation and/or other |
| 18 | materials provided with the distribution. |
| 19 | |
| 20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| 21 | CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| 22 | INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| 25 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 26 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 27 | NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 29 | CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 30 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 31 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| 32 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | |
| 34 | */ |
| 35 | |
| 36 | |
| 37 | #include "u8x8.h" |
| 38 | |
| 39 | static const unsigned char u8x8_u8toa_tab[3] = { 100, 10, 1 } ; |
| 40 | const char *u8x8_u8toap(char * dest, uint8_t v) |
| 41 | { |
| 42 | uint8_t pos; |
| 43 | uint8_t d; |
| 44 | uint8_t c; |
| 45 | for( pos = 0; pos < 3; pos++ ) |
| 46 | { |
| 47 | d = '0'; |
| 48 | c = *(u8x8_u8toa_tab+pos); |
| 49 | while( v >= c ) |
| 50 | { |
| 51 | v -= c; |
| 52 | d++; |
| 53 | } |
| 54 | dest[pos] = d; |
| 55 | } |
| 56 | dest[3] = '\0'; |
| 57 | return dest; |
| 58 | } |
| 59 | |
| 60 | /* v = value, d = number of digits */ |
| 61 | const char *u8x8_u8toa(uint8_t v, uint8_t d) |
| 62 | { |
| 63 | static char buf[4]; |
| 64 | d = 3-d; |
| 65 | return u8x8_u8toap(buf, v) + d; |
| 66 | } |
| 67 | |
| 68 | const char *u8x8_s8toa(int8_t v, uint8_t d) |
| 69 | { |
| 70 | static char buf[5]; |
| 71 | uint16_t u = v; |
| 72 | buf[0] = '+'; |
| 73 | if ( v < 0 ) |
| 74 | { |
| 75 | buf[0] = '-'; |
| 76 | u = -v; |
| 77 | } |
| 78 | u8x8_u8toap(buf+1, (uint8_t)u); |
| 79 | if ( d == 1 ) |
| 80 | { |
| 81 | buf[1] = buf[3]; |
| 82 | buf[2] = '\0'; |
| 83 | } |
| 84 | else if ( d == 2 ) |
| 85 | { |
| 86 | buf[1] = buf[2]; |
| 87 | buf[2] = buf[3]; |
| 88 | buf[3] = '\0'; |
| 89 | } |
| 90 | return buf; |
| 91 | } |
| 92 | |
| 93 | const char *u8x8_u8tox(uint8_t v, uint8_t d) |
| 94 | { |
| 95 | const char hexdigit[]="0123456789ABCDEF"; |
| 96 | static char buf[3]; |
| 97 | if ( d == 1 ) |
| 98 | { |
| 99 | buf[0] = hexdigit[v & 0xF]; |
| 100 | buf[1] = '\0'; |
| 101 | } |
| 102 | else if ( d == 2 ) |
| 103 | { |
| 104 | buf[0] = hexdigit[v >> 4 & 0xF]; |
| 105 | buf[1] = hexdigit[v & 0xF]; |
| 106 | buf[2] = '\0'; |
| 107 | } |
| 108 | return buf; |
| 109 | } |