C++ read_integer函数代码示例

int main() {
    // Read in the number of cases
    FILE *fp = fopen("bigint.in", "r");
    FILE *fo = fopen("bigint.out", "w");
    int numCases, i;
    
    fscanf(fp, "%d", &numCases);
    
    int operation;
    char operand1[200], operand2[200];
    
    for (i = 0; i < numCases; i++) {                
        fscanf(fp, "%d %s %s", &operation, operand1, operand2);

        // Create the big integer structures
        struct integer *bigInt1 = read_integer(operand1);
        struct integer *bigInt2 = read_integer(operand2);                      
		
        // Add or subtract the big integers
        struct integer *result;
        if (operation == 1) {
			// Print each big integer operand and the operation to the file
			print(fo, bigInt1);
			operation == 1 ? fprintf(fo, " + ") : fprintf(fo, " - ");          
			print(fo, bigInt2); 
			fprintf(fo, " = ");
		
            result = add(bigInt1, bigInt2);
        }
        else {
			// We want to subtract bigger - smaller
			int comparison = compare(bigInt1, bigInt2);
			struct integer *bigger  = comparison >= 0 ? bigInt1 : bigInt2;
			struct integer *smaller = comparison >= 0 ? bigInt2 : bigInt1;
		
			// Print each big integer operand and the operation to the file
			print(fo, bigger);
			operation == 1 ? fprintf(fo, " + ") : fprintf(fo, " - ");          
			print(fo, smaller); 
			fprintf(fo, " = ");
		
            result = subtract(bigger, smaller);
        }
        // Print the result
		print(fo, result);
		
        fprintf(fo, "\n");
		
		// Free the digits and then the structure
		free(bigInt1->digits);
		free(bigInt1);
		free(bigInt2->digits);
		free(bigInt2);
		free(result->digits);
		free(result);
    }
	
	fclose(fp);
	fclose(fo);
}

//write the rgb value in gdkcolor
unsigned char read_rgb(GdkColor *pGdkColor, FILE * file)
{
    int iColor;
    if ( !read_integer(&iColor, file) )
    {
        SB_INKERRPRINTF("failed\n");
        return 0;
    }
    pGdkColor->red=(guint16)iColor;
    if ( !read_integer(&iColor, file) )
    {
        SB_INKERRPRINTF("failed\n");
        return 0;
    }
    pGdkColor->green=(guint16)iColor;
    if ( !read_integer(&iColor, file) )
    {
        SB_INKERRPRINTF("failed\n");
        return 0;
    }
    pGdkColor->blue=(guint16)iColor;
    SB_INKPRINTF("rgb(%d,%d,%d) \n", 
                    pGdkColor->red, pGdkColor->green,pGdkColor->blue);
    return 1;
}

 void read_polygon_xyz(boost::ptr_vector<geometry_type> & paths)
 {
     int num_rings = read_integer();
     if (num_rings > 0)
     {
         std::unique_ptr<geometry_type> poly(new geometry_type(geometry_type::types::Polygon));
         for (int i = 0; i < num_rings; ++i)
         {
             int num_points = read_integer();
             if (num_points > 0)
             {
                 CoordinateArray ar(num_points);
                 read_coords_xyz(ar);
                 poly->move_to(ar[0].x, ar[0].y);
                 for (int j = 1; j < num_points; ++j)
                 {
                     poly->line_to(ar[j].x, ar[j].y);
                 }
                 poly->close_path();
             }
         }
         if (poly->size() > 2) // ignore if polygon has less than 3 vertices
             paths.push_back(poly.release());
     }
 }

bool G_SoldierMakeMgr::init() {
    auto tab_info = the_app->script()->read_table("the_soldier_make_info");
    if (tab_info->is_nil()) {
        return false;
    }
    G_SoldierMakeInfo *info = nullptr;
    for (unsigned i = 1; ; ++i) {
        auto tab_item = tab_info->read_table(i);
        if (tab_item->is_nil()) {
            break;
        }

        int item_id = tab_item->read_integer("itemid", -1);
        if (item_id < 0) {
            if (!info) {
                continue;
            }
        }
        else {
            const G_ItemInfo *item_info = G_ItemMgr::instance()->get_info(item_id);
            if (!item_info) {
                log_error("unknown item id '%d'.", item_id);
                return false;
            }
            info = probe_info(item_id);
            if (info->_use_item) {
                log_error("dup item id '%d'.", item_id);
                return false;
            }
            info->_use_item = item_info;
            info->_use_count = tab_item->read_integer("itemnumber", 0);
            if (!info->_use_count) {
                log_error("bad use item count.");
                return false;
            }
        }

        int soldier_id = tab_item->read_integer("heroid", -1);
        if (soldier_id < 0) {
            continue;
        }

        const G_SoldierInfo *soldier_info = G_SoldierMgr::instance()->get_info(soldier_id);
        if (!soldier_info) {
            log_error("unknown soldier id '%d'.", soldier_id);
            return false;
        }

        info->_soldiers.push_back(soldier_info);
    }
    return true;
}

void 
GBitmap::init(ByteStream &ref, int aborder)
{
  GMonitorLock lock(monitor());
  // Get magic number
  char magic[2];
  magic[0] = magic[1] = 0;
  ref.readall((void*)magic, sizeof(magic));
  char lookahead = '\n';
  int acolumns = read_integer(lookahead, ref);
  int arows = read_integer(lookahead, ref);
  init(arows, acolumns, aborder);
  // go reading file
  if (magic[0]=='P')
    {
      switch(magic[1])
        {
        case '1':
          grays = 2;
          read_pbm_text(ref); 
          return;
        case '2':
          grays = 1 + read_integer(lookahead, ref);
          if (grays > 256)
            G_THROW("Cannot read PGM with depth greater than 8 bits.");
          read_pgm_text(ref); 
          return;
        case '4':
          grays = 2;
          read_pbm_raw(ref); 
          return;
        case '5':
          grays = 1 + read_integer(lookahead, ref);
          if (grays > 256)
            grays = 256;
          read_pgm_raw(ref); 
          return;
        }
    }
  else if (magic[0]=='R')
    {
      switch(magic[1])
        {
        case '4':
          grays = 2;
          read_rle_raw(ref); 
          return;
        }
    }
  G_THROW( ERR_MSG("GBitmap.bad_format") );
}

void Book::read_entry(BookEntry& entry, int n) const {
  assert(n >= 0 && n < bookSize);
  assert(bookFile != NULL);

  if(fseek(bookFile, n*16, SEEK_SET) == -1) {
    std::cerr << "Failed to read book entry at index " << n << std::endl;
    exit(EXIT_FAILURE);
  }

  entry.key = read_integer(bookFile, 8);
  entry.move = read_integer(bookFile, 2);
  entry.count = read_integer(bookFile, 2);
  entry.n = read_integer(bookFile, 2);
  entry.sum = read_integer(bookFile, 2);
}

static ssize_t network_read_mask(int fd, uint32_t *mask, size_t words)
{
	long read_len;
	ssize_t ret;

	ret = read_integer(fd, &read_len);
	if (ret < 0)
		return ret;

	if (read_len > 0 && mask) {
		size_t i;
		char buf[9];

		buf[8] = '\0';
		DEBUG("Reading mask\n");

		for (i = words; i > 0; i--) {
			ret = read_all(buf, 8, fd);
			if (ret < 0)
				return ret;

			sscanf(buf, "%08x", &mask[i - 1]);
			DEBUG("mask[%i] = 0x%x\n", i - 1, mask[i - 1]);
		}
	}

	if (read_len > 0) {
		char c;
		ssize_t nb = read_all(&c, 1, fd);
		if (nb > 0 && c != '\n')
			read_len = -EIO;
	}

	return (ssize_t) read_len;
}

int main(int argc, char **argv) 
{
	CLIENT client_struct, *c;
        FLICK_SERVER_LOCATION s;
	int sel, done;
	
	c = &client_struct;
	
	if (argc != 2) {
		fprintf(stderr, "Usage: %s <host>\n", argv[0]);
		exit(1);
	}
	
	s.server_name = argv[1];
	s.prog_num = netphone;
	s.vers_num = firstphone;
	create_client(c, s);
	
	done = 0;
	while (!done) {
		read_integer(("\n(1) Add an entry (2) Remove an entry "
			      "(3) Find a phone number (4) Exit: "),
			     &sel);
		switch(sel) {
		case 1:  add_entry(c); break;
		case 2:  remove_entry(c); break;
		case 3:  find_entry(c); break;
		case 4:  done = 1; break;
		default: printf("Please enter 1, 2, 3, or 4.\n");
		}
	}
	return 0;
}

static long exec_command(const char *cmd, int fd)
{
	long resp;
	ssize_t ret = write_command(cmd, fd);
	if (ret < 0)
		return (long) ret;

	DEBUG("Reading response\n");
	ret = read_integer(fd, &resp);
	if (ret < 0) {
		char buf[1024];
		iio_strerror(-ret, buf, sizeof(buf));
		ERROR("Unable to read response: %s\n", buf);
		return (long) ret;
	}

#if LOG_LEVEL >= DEBUG_L
	if (resp < 0) {
		char buf[1024];
		iio_strerror(-resp, buf, sizeof(buf));
		DEBUG("Server returned an error: %s\n", buf);
	}
#endif

	return resp;
}

 geometry_ptr read() 
 {
     geometry_ptr geom;
     int type=read_integer();
     switch (type)
     {
     case wkbPoint:
         geom = read_point();
         break;
     case wkbLineString:
         geom = read_linestring();
         break;
     case wkbPolygon:
         geom = read_polygon();
         break;
     case wkbMultiPoint:
         geom = read_multipoint();
         break;
     case wkbMultiLineString:
         geom = read_multilinestring();
         break;
     case wkbMultiPolygon:
         geom=read_multipolygon();
         break;
     case wkbGeometryCollection:
         break;
     default:
         break;
     }
     return geom;
 }

static ssize_t read_error_code(int fd)
{
	/*
	 * The server returns two integer codes.
	 * The first one is returned right after the WRITEBUF command is issued,
	 * and corresponds to the error code returned when the server attempted
	 * to open the device.
	 * If zero, a second error code is returned, that corresponds (if positive)
	 * to the number of bytes written.
	 *
	 * To speed up things, we delay error reporting. We just send out the
	 * data without reading the error code that the server gives us, because
	 * the answer will take too much time. If an error occured, it will be
	 * reported by the next call to iio_buffer_push().
	 */

	unsigned int i;
	long resp = 0;

	for (i = 0; i < 2; i++) {
		ssize_t ret = read_integer(fd, &resp);
		if (ret < 0)
			return ret;
		if (resp < 0)
			return (ssize_t) resp;
	}

	return (ssize_t) resp;
}

static void read_entry(entry_t * entry, int n) {

   ASSERT(entry!=NULL);
   ASSERT(n>=0&&n<BookSize);

   ASSERT(BookFile!=NULL);

   if (fseek(BookFile,n*16,SEEK_SET) == -1) {
      my_fatal("read_entry(): fseek(): %s\n",strerror(errno));
   }

   entry->key   = read_integer(BookFile,8);
   entry->move  = read_integer(BookFile,2);
   entry->count = read_integer(BookFile,2);
   entry->n     = read_integer(BookFile,2);
   entry->sum   = read_integer(BookFile,2);
}

 void read_multilinestring_xyz(boost::ptr_vector<geometry_type> & paths)
 {
     int num_lines = read_integer();
     for (int i = 0; i < num_lines; ++i)
     {
         pos_ += 5;
         read_linestring_xyz(paths);
     }
 }

 void read_multipolygon_xyz(boost::ptr_vector<geometry_type> & paths)
 {
     int num_polys = read_integer();
     for (int i = 0; i < num_polys; ++i)
     {
         pos_ += 5;
         read_polygon_xyz(paths);
     }
 }

 void read_collection(boost::ptr_vector<geometry_type> & paths)
 {
     int num_geometries = read_integer();
     for (int i = 0; i < num_geometries; ++i)
     {
         pos_ += 1; // skip byte order
         read(paths);
     }
 }