comparison: components/u8g2/csrc/u8x8_string.c
components/u8g2/csrc/u8x8_string.c
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| 1 /* | |
| 2 | |
| 3 u8x8_string.c | |
| 4 | |
| 5 string line procedures | |
| 6 | |
| 7 Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/) | |
| 8 | |
| 9 Copyright (c) 2016, olikraus@gmail.com | |
| 10 All rights reserved. | |
| 11 | |
| 12 Redistribution and use in source and binary forms, with or without modification, | |
| 13 are permitted provided that the following conditions are met: | |
| 14 | |
| 15 * Redistributions of source code must retain the above copyright notice, this list | |
| 16 of conditions and the following disclaimer. | |
| 17 | |
| 18 * Redistributions in binary form must reproduce the above copyright notice, this | |
| 19 list of conditions and the following disclaimer in the documentation and/or other | |
| 20 materials provided with the distribution. | |
| 21 | |
| 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND | |
| 23 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 24 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 25 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 26 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | |
| 27 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 28 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 29 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
| 31 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
| 32 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 33 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 34 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 35 | |
| 36 */ | |
| 37 | |
| 38 #include "u8x8.h" | |
| 39 | |
| 40 uint8_t u8x8_GetStringLineCnt(const char *str) | |
| 41 { | |
| 42 char e; | |
| 43 uint8_t line_cnt = 1; | |
| 44 if ( str == NULL ) | |
| 45 return 0; | |
| 46 for(;;) | |
| 47 { | |
| 48 e = *str; | |
| 49 if ( e == '\0' ) | |
| 50 break; | |
| 51 str++; | |
| 52 if ( e == '\n' ) | |
| 53 line_cnt++; | |
| 54 } | |
| 55 return line_cnt; | |
| 56 } | |
| 57 | |
| 58 | |
| 59 /* | |
| 60 Assumes strings, separated by '\n' in "str". | |
| 61 Returns the string at index "line_idx". First strng has line_idx = 0 | |
| 62 Example: | |
| 63 Returns "xyz" for line_idx = 1 with str = "abc\nxyz" | |
| 64 Support both UTF8 and normal strings. | |
| 65 */ | |
| 66 const char *u8x8_GetStringLineStart(uint8_t line_idx, const char *str ) | |
| 67 { | |
| 68 char e; | |
| 69 uint8_t line_cnt = 1; | |
| 70 | |
| 71 if ( line_idx == 0 ) | |
| 72 return str; | |
| 73 | |
| 74 for(;;) | |
| 75 { | |
| 76 e = *str; | |
| 77 if ( e == '\0' ) | |
| 78 break; | |
| 79 str++; | |
| 80 if ( e == '\n' ) | |
| 81 { | |
| 82 if ( line_cnt == line_idx ) | |
| 83 return str; | |
| 84 line_cnt++; | |
| 85 } | |
| 86 } | |
| 87 return NULL; /* line not found */ | |
| 88 } | |
| 89 | |
| 90 /* copy until first '\n' or '\0' in str */ | |
| 91 /* Important: There is no string overflow check, ensure */ | |
| 92 /* that the destination buffer is large enough */ | |
| 93 void u8x8_CopyStringLine(char *dest, uint8_t line_idx, const char *str) | |
| 94 { | |
| 95 if ( dest == NULL ) | |
| 96 return; | |
| 97 str = u8x8_GetStringLineStart( line_idx, str ); | |
| 98 if ( str != NULL ) | |
| 99 { | |
| 100 for(;;) | |
| 101 { | |
| 102 if ( *str == '\n' || *str == '\0' ) | |
| 103 break; | |
| 104 *dest = *str; | |
| 105 dest++; | |
| 106 str++; | |
| 107 } | |
| 108 } | |
| 109 *dest = '\0'; | |
| 110 } | |
| 111 | |
| 112 /* | |
| 113 Draw a string | |
| 114 Extend the string to size "w" | |
| 115 Center the string within "w" | |
| 116 return the size of the string | |
| 117 | |
| 118 */ | |
| 119 uint8_t u8x8_DrawUTF8Line(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s) | |
| 120 { | |
| 121 uint8_t d, lw; | |
| 122 uint8_t cx, dx; | |
| 123 | |
| 124 d = 0; | |
| 125 | |
| 126 lw = u8x8_GetUTF8Len(u8x8, s); | |
| 127 if ( lw < w ) | |
| 128 { | |
| 129 d = w; | |
| 130 d -=lw; | |
| 131 d /= 2; | |
| 132 } | |
| 133 | |
| 134 cx = x; | |
| 135 dx = cx + d; | |
| 136 while( cx < dx ) | |
| 137 { | |
| 138 u8x8_DrawUTF8(u8x8, cx, y, " "); | |
| 139 cx++; | |
| 140 } | |
| 141 cx += u8x8_DrawUTF8(u8x8, cx, y, s); | |
| 142 dx = x + w; | |
| 143 while( cx < dx ) | |
| 144 { | |
| 145 u8x8_DrawUTF8(u8x8, cx, y, " "); | |
| 146 cx++; | |
| 147 } | |
| 148 cx -= x; | |
| 149 return cx; | |
| 150 } | |
| 151 | |
| 152 /* | |
| 153 draw several lines at position x,y. | |
| 154 lines are stored in s and must be separated with '\n'. | |
| 155 lines can be centered with respect to "w" | |
| 156 if s == NULL nothing is drawn and 0 is returned | |
| 157 returns the number of lines in s | |
| 158 */ | |
| 159 uint8_t u8x8_DrawUTF8Lines(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s) | |
| 160 { | |
| 161 uint8_t i; | |
| 162 uint8_t cnt; | |
| 163 cnt = u8x8_GetStringLineCnt(s); | |
| 164 for( i = 0; i < cnt; i++ ) | |
| 165 { | |
| 166 u8x8_DrawUTF8Line(u8x8, x, y, w, u8x8_GetStringLineStart(i, s)); | |
| 167 y++; | |
| 168 } | |
| 169 return cnt; | |
| 170 } |
