--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/components/u8g2/csrc/u8x8_string.c Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,170 @@
+/*
+
+ u8x8_string.c
+
+ string line procedures
+
+ Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
+
+ Copyright (c) 2016, olikraus@gmail.com
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without modification,
+ are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this list
+ of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice, this
+ list of conditions and the following disclaimer in the documentation and/or other
+ materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#include "u8x8.h"
+
+uint8_t u8x8_GetStringLineCnt(const char *str)
+{
+ char e;
+ uint8_t line_cnt = 1;
+ if ( str == NULL )
+ return 0;
+ for(;;)
+ {
+ e = *str;
+ if ( e == '\0' )
+ break;
+ str++;
+ if ( e == '\n' )
+ line_cnt++;
+ }
+ return line_cnt;
+}
+
+
+/*
+ Assumes strings, separated by '\n' in "str".
+ Returns the string at index "line_idx". First strng has line_idx = 0
+ Example:
+ Returns "xyz" for line_idx = 1 with str = "abc\nxyz"
+ Support both UTF8 and normal strings.
+*/
+const char *u8x8_GetStringLineStart(uint8_t line_idx, const char *str )
+{
+ char e;
+ uint8_t line_cnt = 1;
+
+ if ( line_idx == 0 )
+ return str;
+
+ for(;;)
+ {
+ e = *str;
+ if ( e == '\0' )
+ break;
+ str++;
+ if ( e == '\n' )
+ {
+ if ( line_cnt == line_idx )
+ return str;
+ line_cnt++;
+ }
+ }
+ return NULL; /* line not found */
+}
+
+/* copy until first '\n' or '\0' in str */
+/* Important: There is no string overflow check, ensure */
+/* that the destination buffer is large enough */
+void u8x8_CopyStringLine(char *dest, uint8_t line_idx, const char *str)
+{
+ if ( dest == NULL )
+ return;
+ str = u8x8_GetStringLineStart( line_idx, str );
+ if ( str != NULL )
+ {
+ for(;;)
+ {
+ if ( *str == '\n' || *str == '\0' )
+ break;
+ *dest = *str;
+ dest++;
+ str++;
+ }
+ }
+ *dest = '\0';
+}
+
+/*
+ Draw a string
+ Extend the string to size "w"
+ Center the string within "w"
+ return the size of the string
+
+*/
+uint8_t u8x8_DrawUTF8Line(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s)
+{
+ uint8_t d, lw;
+ uint8_t cx, dx;
+
+ d = 0;
+
+ lw = u8x8_GetUTF8Len(u8x8, s);
+ if ( lw < w )
+ {
+ d = w;
+ d -=lw;
+ d /= 2;
+ }
+
+ cx = x;
+ dx = cx + d;
+ while( cx < dx )
+ {
+ u8x8_DrawUTF8(u8x8, cx, y, " ");
+ cx++;
+ }
+ cx += u8x8_DrawUTF8(u8x8, cx, y, s);
+ dx = x + w;
+ while( cx < dx )
+ {
+ u8x8_DrawUTF8(u8x8, cx, y, " ");
+ cx++;
+ }
+ cx -= x;
+ return cx;
+}
+
+/*
+ draw several lines at position x,y.
+ lines are stored in s and must be separated with '\n'.
+ lines can be centered with respect to "w"
+ if s == NULL nothing is drawn and 0 is returned
+ returns the number of lines in s
+*/
+uint8_t u8x8_DrawUTF8Lines(u8x8_t *u8x8, uint8_t x, uint8_t y, uint8_t w, const char *s)
+{
+ uint8_t i;
+ uint8_t cnt;
+ cnt = u8x8_GetStringLineCnt(s);
+ for( i = 0; i < cnt; i++ )
+ {
+ u8x8_DrawUTF8Line(u8x8, x, y, w, u8x8_GetStringLineStart(i, s));
+ y++;
+ }
+ return cnt;
+}