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yahooTS.cpp

Go to the documentation of this file.

#include <errno.h>
#include <stdio.h>
#include <string.h>

#include "yahooTS.h"


const char *yahooTS::getStr_( char *&line,
                              char *buf,
                              size_t bufSize ) const
{
  const char *rtnPtr = 0;
  if (line != 0) {
    for (size_t charCnt = 0; charCnt < bufSize-1 && *line != '\0'; charCnt++) {
      if (*line == ',') {
        line++;
        break;
      }
      else {
        buf[charCnt] = *line++;
      }
    }
    
    buf[charCnt] = '\0';
    if (charCnt > 0)
    {
      rtnPtr = buf;
    }
  }
  return rtnPtr;
} // getStr_



void yahooTS::parseVals_( char *line,
                          double *vals,
                          const size_t n ) const
{
  char buf[128];
  const char *ptr;

  // skip the date
  ptr = getStr_( line, buf, sizeof( buf ) );
  if (ptr == 0) {
    fprintf(stderr, "parseVals: date expected\n" );
    return;
  }

  // get the Open, High, Low, Close and Volume values
  size_t cnt = 0;
  for (dataKind kind = Open; 
       kind <= Volume && cnt < n; 
       kind = (dataKind)((size_t)kind + 1)) {

    ptr = getStr_( line, buf, sizeof( buf ) );
    if (ptr == 0) {
      fprintf(stderr, "parseVals: value expected\n");
      return;
    }

    double v;

    sscanf( buf, "%lf", &v );
    vals[cnt] = v;
    cnt++;
  }

} // parseVals_


const double yahooTS::getValue_( char *line, 
                                 const yahooTS::dataKind kind ) const
{
  double retval = 0;

  if (kind > badEnum && kind < lastEnum) {
    const size_t NUM_VALS = 5;
    double vals[ NUM_VALS ];

    parseVals_( line, vals, NUM_VALS );

    size_t ix = (size_t)kind - 1;
    if (ix < NUM_VALS) {
      retval = vals[ix];
    }
  }

  return retval;
} // getValue


const double *yahooTS::getTS( const char *fileName,
                              double *a,
                              size_t &N,
                              const yahooTS::dataKind kind ) const
{
  const double *rtnPtr = 0;
  char fullPath[512];
  size_t freePath = sizeof( fullPath );
  FILE *fptr;

  if (path_ != 0) {
    strncpy( fullPath, path_, freePath-1 );
    freePath = freePath - strlen( fullPath );
  }
  strncat( fullPath, fileName, freePath-1 );
  fptr = fopen( fullPath, "r" );
  if (fptr != 0) {
    char line[512];
    size_t lineSize = sizeof( line );
    int ix = N-1;

    if (fgets( line, lineSize, fptr ) != 0) {
      rtnPtr = a;
      while (fgets( line, lineSize, fptr ) != 0) {
        if (ix >= 0) {
          a[ix] = getValue_( line, kind );
          ix--;
        }
        else {
          break;
        }
      } // while
    }
    else {
      fprintf(stderr, "getTS: title line expected\n");
    }
    ix++;
    N = N - ix;
  }
  else {
    const char *error = strerror( errno );
    fprintf(stderr, "getTS: Error opening %s: %s\n", fullPath, error );
  }

  return rtnPtr;
} // getTS

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