io.h and _access

[LJP]

Is there a standard C or standard C++ function for the _access in io.h for
seeing if a file or directory exists?
LP

[Mark Veldt]

You can use:

int file_exists(char *file)
{ /* Check for existence */
if( (_access( file, 0 )) != -1 )
{
return true;
}
return false;
}




From my code (works always):

int file_exists(char *file)
{
FILE *fd;

if(strlen(file)==0)
{
/* No legal file name */
return false;
}
if((fd=fopen(file,"r"))==NULL)
{
/* File doesn't exists */
return false;
}
/* File exists */
fclose(fd);
return true;
}

int dir_exists(char *directory_path)
{
char current_path[MAX_PATH+1];

/* Store current working directory */
if(_getcwd(current_path,MAX_PATH)==NULL)
{
/* Action failed */
return false;
}

if(_chdir(directory_path)==-1)
{
/* Directory doesn't exists */
return false;
}
/* Directory exists, go back to old directory */
if(_chdir(current_path)==-1)
{
/* Can't go back to current directory */
return false;
}
return true;
}




Mark

[ALM]

The function I use is "stat". Here's how I use it:


// Returns true if the given szPath is a valid directory.
bool IsDir(const char* szPath)
{
assert(szPath);

struct stat statBuffer;
return (stat(szPath, &statBuffer) >= 0 && // make sure it exists
statBuffer.st_mode & S_IFDIR); // and it's not a file
}

// Returns true if the given szFile a valid file.
bool IsFile(const char* szFile)
{
assert(szFile);

struct stat statBuffer;
return (stat(szFile, &statBuffer) >= 0 && // make sure it exists
statBuffer.st_mode & S_IFREG); // and it's not a directory
}