Simple text wrapping and breaking at the end of words for the TI-84 Plus CE

text-wrap.c

// Find where to break lines
unsigned int spaceSearch(const char *string, const unsigned int start) {
    for (int k = start; k >= 0; k--) {
        if (string[k] == ' ') {
            return k + 1;
        }
    }

    return start;
}

void printStringWrap(const char *string, unsigned int x, uint8_t y, unsigned int charsPerLine, uint8_t maxLines) {
    // Offset in the current string to begin displaying the current line's text at
    unsigned int offset = 0;
    // Current number of lines that the text has been drawn for (To ensure it doesn't pass maxLines)
    uint8_t line = 1;
    // Offset in the string where to end displaying the current line's text
    unsigned int end = 0;

    while (line <= maxLines) {
        gfx_SetTextXY(x, y);

        // Break lines at the end of words, if possible
        if (strlen(string + offset) <= charsPerLine || line == maxLines) {
            end = charsPerLine;
        } else {
            end = util_SpaceSearch(string + offset, charsPerLine);
        }

        for (unsigned int byte = 0; byte < end; byte++) {
            if ((string + offset)[byte] == '\0') {
                return;
            }

            if (line == maxLines && byte == end - 1 && (string + offset)[byte + 1] != '\0') {
                // String extends past maximum space allowed, so cut it off with ...
                gfx_PrintString("...");
            } else {
                gfx_PrintChar((string + offset)[byte]);
            }
        }

        offset += end;

        if (*(string + offset) == '\0') {
            return y;
        }

        y += 12;
        line++;
    }
}