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/* libstocks - Library to get current stock quotes from Yahoo Finance
*
* Copyright (C) 2000 Eric Laeuffer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#define __HISTORY_C__
#include <string.h>
#include <stdlib.h>
#ifdef __WINDOWS__
#include <malloc.h>
#endif
#include "stocks.h"
#include "http.h"
#include "csv.h"
const char history_stocks_server[]="chart.yahoo.com";
const char url_history_beg[]="/table.csv?s=";
/*****************************************************************************/
/* Gets the stock history csv file and return in csv_file the result. */
/* The stock is defined by its symbol. */
/* The history file starts at date1 and stops at date2. */
/*****************************************************************************/
libstocks_return_code get_history_csv(char *symbol,
char *date1,
char *date2,
char **csv_file)
{
char *data;
char url[80];
char adate[12];
char *y1, *y2;
char *m1, *m2;
char *d1, *d2;
libstocks_return_code error;
char *test;
strcpy(url, url_history_beg);
strcat(url, symbol);
strcpy(adate, date1);
y1=strtok(adate, "/");
if(!y1) return ERRDATE;
m1 = strtok(NULL, "/");
if(!m1) return ERRDATE;
d1 = strtok(NULL, "/");
if(!m1) return ERRDATE;
strcat(url, "&a=");
strcat(url, m1);
strcat(url, "&b=");
strcat(url, d1);
strcat(url, "&c=");
strcat(url, y1);
strcpy(adate, date2);
y2=strtok(adate, "/");
if(!y2) return ERRDATE;
m2 = strtok(NULL, "/");
if(!m2) return ERRDATE;
d2 = strtok(NULL, "/");
if(!d2) return ERRDATE;
strcat(url, "&d=");
strcat(url, m2);
strcat(url, "&e=");
strcat(url, d2);
strcat(url, "&f=");
strcat(url, y2);
strcat(url, "&g=d&q=q&y=0&x=.csv");
error=http_get(url, (char *)history_stocks_server, &data);
if (error) return error;
/* tests if data is valid */
/* The server returns "No data available for symbol" */
/* when the stock is not available */
test = strstr(data, "No data available");
if (test)
{
free(data);
return ERRDATA;
}
/* The server return "No Prices in this date range" */
/* when dates have not the good range */
test = strstr(data, "No Prices in this date range");
if (test)
{
free(data);
return ERRRANG;
}
*csv_file = data;
return(0);
}
/*****************************************************************************/
/* Gets the stock history and return a stock structure list. */
/* The stock is defined by its symbol. */
/* The history file starts at date1 and stops at date2. */
/*****************************************************************************/
libstocks_return_code get_stock_history(char *symbol,
char *date1,
char *date2,
stock **stock_history)
{
libstocks_return_code error;
char *csv_file;
stock *stock_parsed;
error = get_history_csv(symbol, date1, date2, &csv_file);
if (error) return error;
stock_parsed = parse_csv_history_file(csv_file);
free(csv_file);
if (!stock_parsed) return ERRPCSV;
*stock_history = stock_parsed;
return(0);
}
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