63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
//language.c
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#include "language.h"
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#include <inttypes.h>
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#include <avr/pgmspace.h>
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// Currectly active language selection.
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unsigned char lang_selected = 0;
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#if (LANG_MODE == 0) //primary language only
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#else //(LANG_MODE == 0)
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//reserved xx kbytes for secondary language table
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const char _SEC_LANG[LANG_SIZE_RESERVED] PROGMEM_I2 = "_SEC_LANG";
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#endif //(LANG_MODE == 0)
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//lang_table_t structure - 16byte header
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typedef struct
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{
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struct
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{
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uint32_t magic;
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uint16_t size;
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uint16_t count;
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uint16_t checksum;
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uint16_t reserved0;
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uint32_t reserved1;
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} header;
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uint16_t table[];
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} lang_table_t;
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//lang_table pointer
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lang_table_t* lang_table = 0;
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const char* lang_get_translation(const char* s)
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{
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if (lang_selected == 0) return s + 2; //primary language selected
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if (lang_table == 0) return s + 2; //sec. lang table not found
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uint16_t ui = pgm_read_word(((uint16_t*)s)); //read string id
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if (ui == 0xffff) return s + 2; //translation not found
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ui = pgm_read_word(((uint16_t*)(((char*)lang_table + 16 + ui*2)))); //read relative offset
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return (const char*)((char*)lang_table + ui + 16); //return calculated pointer
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}
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const char* lang_select(unsigned char lang)
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{
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#if (LANG_MODE == 0) //primary language only
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return 0;
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#else //(LANG_MODE == 0)
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if (lang == 0) //primary language
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{
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lang_table = 0;
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lang_selected = 0;
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return;
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}
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uint16_t ui = (uint16_t)&_SEC_LANG; //pointer to _SEC_LANG reserved space
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ui += 0x0100; //add 1 page
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ui &= 0xff00; //align to page
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lang_table = ui; //set table pointer
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ui = pgm_read_word(((uint16_t*)(((char*)lang_table + 16)))); //read relative offset of first string (language name)
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return (const char*)((char*)lang_table + ui + 16); //return calculated pointer
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#endif //(LANG_MODE == 0)
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} |