/*   Cataract - Static web photo gallery generator
 *   Copyright (C) 2008 Tomas Bzatek <tbzatek@users.sourceforge.net>
 *   
 *   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 any later version.
 *   
 *   This program 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 General Public License for more details.
 *   
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>

#include "gallery-utils.h"


/*
 *   str_replace: replace substring 'search' with a 'replace' string
 *                - only one occurence of the string is replaced
 * 				  - reallocates the original string  
 */ 
void 
str_replace (char **dst, const char *search, const char *replace)
{
  char *res;
  char *tms;
  int new_str_len;
  
  /*  is 'search' present in 'dst'?  */
  res = strstr (*dst, search);
  if (res == NULL) 
	  return;
  
  new_str_len = strlen (*dst) - strlen (search) + strlen (replace) + 1;
  
  tms = malloc (new_str_len);
  memset (tms, 0, new_str_len);
  
  memcpy (tms, *dst, res - *dst); 
  memcpy ((void*) ((long int) tms + (long int) res - (long int) *dst), 
		  replace, 
		  strlen (replace));
  memcpy ((void*) ((long int) tms + (long int) res - (long int) *dst + strlen (replace)), 
		  (void*) ((long int) res + strlen (search)), 
		  strlen (res) - strlen (search));
  
  /*  return fixed string  */
  free (*dst);
  *dst = tms;
}


/*
 *   copy_file: copy file from src to dst  
 */ 
gboolean 
copy_file (const char *src, const char *dst)
{
  #define BUFFER_SIZE 65536
  
  FILE *fin;
  FILE *fout;
  void *buffer;
  int size_r;
  
  fin = fopen (src, "r");
  if (fin == NULL) {
    fprintf (stderr, "copy_file: error reading file \"%s\": %s\n", src, strerror (errno));
    return FALSE;  
  }
  
  fout = fopen (dst, "w");
  if (fout == NULL) {
    fprintf (stderr, "copy_file: error writing to file \"%s\": %s\n", dst, strerror (errno));
    fclose (fin);
    return FALSE;  
  }
  
  buffer = malloc (BUFFER_SIZE);
  memset (buffer, 0, BUFFER_SIZE);
  size_r = BUFFER_SIZE;
  
  while ((! feof (fin)) && (size_r == BUFFER_SIZE)) {
    size_r = fread (buffer, 1, BUFFER_SIZE, fin);
    fwrite (buffer, 1, size_r, fout);
  }
  
  fclose (fout);  
  fclose (fin);
  free (buffer);
  
  return TRUE;  
}


/*
 *   make_string: make string of 'substr' substrings
 *                - returns newly allocated string    
 */ 
char *
make_string (const char* substr, const int count)
{
  int i;
  char *s;
  
  s = malloc (strlen (substr) * count + 1);
  for (i = 0; i < count; i++)
	  memcpy (s + (strlen (substr) * i), substr, strlen (substr));
  s[strlen (substr) * count] = 0;  
  return s;  
}