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misc.c

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/***************************************************************************
                                   misc.c
                             -------------------
    begin                : Sun Dec 09 2001
    copyright            : (C) 2001-2002 by Christian Hoenig & Gunter Ohrner
    email                : pdepp@CustomCDROM.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "common.h"

#include <ctype.h>
#include <stdlib.h>
#include <string.h>

#include "misc.h"

#include "buffer.h"
#include "xmalloc.h"

// Returns the next key seperatet by space chars of the passed str
// beginning at "from"
int getNextValue(int *beg, int *end, unsigned int from, const char *str)
{
  //if we fall over a clrf, this is increased
  int crlf = 0;

  //we can not work with invalid data
  if (str == NULL || from >= strlen(str)) return -1;

  *beg = from;
  while (isspace((int) *(str+*beg)))  (*beg)++;
  
  if (*beg > 0)
    if(*(str+*beg-1) == '\n')
      crlf++;

  //is there no " " ?
  if (str[*beg] == '\0')  return -1;

  *end = (*beg) + 1;
  while (!isspace((int) *(str+*end)) && *(str+*end) != '\0') (*end)++;

  //so we point to the last nonspace char;
  (*end)--;
  return crlf;
}



#define SIZE_INC 256      

// reliably read a line from a stream in a secure way
char* getLine(FILE *file)
{
  struct Buffer line = bufInit((char*)pd_malloc(SIZE_INC), SIZE_INC, 0);
  int cur_chr;
  
  while ((cur_chr = getc(file)) != EOF)
  {
    *(line.data + line.pos) = (char) cur_chr;
    //check if we reached an eol
    if (*(line.data + line.pos) == '\n')
    {
      *(line.data + line.pos) = '\0';
      return line.data;
    }

    //we have reached the end of the buffersize
    if (++(line.pos) == line.len)
    {
      char* tmp = (char*)pd_realloc(line.data, line.pos + SIZE_INC);
      
      if (tmp != NULL)
      {//reallocation succedded
        line.data = tmp;
        line.pos += SIZE_INC;
      }
      else
      {//realloc failed
        pd_free(line.data);
        return NULL;
      }
    }
  }
  
  *(line.data + line.pos) = '\0';
  return line.data;
}

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