113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
#include "Textbook.h"
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#include <SDL.h>
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#include "Alloc.h"
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#include "Vlogging.h"
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void textbook_init(Textbook* textbook)
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{
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textbook->pages_used = 0;
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textbook->protect = false;
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}
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void textbook_clear(Textbook* textbook)
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{
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if (textbook->protect)
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{
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return;
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}
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for (short p = 0; p < textbook->pages_used; p++)
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{
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VVV_free(textbook->page[p]);
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}
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textbook->pages_used = 0;
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}
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void textbook_set_protected(Textbook* textbook, bool protect)
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{
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/* A protected textbook is silently not cleared when requested.
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* Not a memory leak as long as you unprotect and clear at some point. */
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textbook->protect = protect;
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}
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const void* textbook_store_raw(Textbook* textbook, const void* data, size_t data_len)
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{
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if (data == NULL)
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{
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return NULL;
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}
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if (data_len > TEXTBOOK_PAGE_SIZE)
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{
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vlog_warn(
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"Cannot store data of %ld bytes in Textbook, max page size is %d",
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data_len,
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TEXTBOOK_PAGE_SIZE
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);
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return NULL;
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}
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/* Find a suitable page to place our text on */
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short found_page = -1;
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for (short p = 0; p < textbook->pages_used; p++)
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{
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size_t free = TEXTBOOK_PAGE_SIZE - textbook->page_len[p];
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if (data_len <= free)
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{
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found_page = p;
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break;
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}
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}
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if (found_page == -1)
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{
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/* Create a new page then */
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found_page = textbook->pages_used;
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if (found_page >= TEXTBOOK_MAX_PAGES)
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{
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vlog_warn(
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"Textbook is full! %hd pages used (%d chars per page)",
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textbook->pages_used,
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TEXTBOOK_PAGE_SIZE
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);
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return NULL;
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}
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textbook->page[found_page] = (char*) SDL_malloc(TEXTBOOK_PAGE_SIZE);
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if (textbook->page[found_page] == NULL)
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{
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return NULL;
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}
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textbook->page_len[found_page] = 0;
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textbook->pages_used++;
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}
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size_t cursor = textbook->page_len[found_page];
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char* added_text = &textbook->page[found_page][cursor];
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SDL_memcpy(added_text, data, data_len);
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textbook->page_len[found_page] += data_len;
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return added_text;
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}
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const char* textbook_store(Textbook* textbook, const char* text)
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{
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if (text == NULL)
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{
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return NULL;
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}
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if (text[0] == '\0')
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{
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/* Don't go and store a single null terminator when we have one right here for you: */
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return "";
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}
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return (const char*) textbook_store_raw(textbook, text, SDL_strlen(text)+1);
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}
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