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#include "file_use.h"
//---------------------------------------------------------------------
void f_file_null( f_file *f_f )
{
if ( f_f )
{
f_f->fid = NULL;
f_f->flags = 0;
f_f->size = -1;
f_f->seek = -1;
}
}
//---------------------------------------------------------------------
int f_file_seek( f_file *f_f, long offset, int seek )
{
int ret=-1;
//PRINT("\n");
if ( f_f )
{
if ( offset < 0 )
{
ERROR("\n");
return -1;
}
if ( offset > f_f->size )
{
ERROR("\n");
return -1;
}
ret = fseek( f_f->fid, offset , seek );
PRINT("ret=%d\n",ret);
if ( ret == 0 )
{
f_f->seek = ret;
}
else
{
ERROR("cannot seek to %d\n", offset);
return -1;
}
PRINT("ret=%d\n",ret);
}
return ret;
}
//---------------------------------------------------------------------
size_t f_file_read( f_file *f_f, size_t size, void *ptr )
{
size_t ret=-1;
//PRINT("\n");
if ( f_f )
{
if ( (f_f->flags == F_FILE_READ) ||
(f_f->flags == F_FILE_RW))
{
if ( f_f->size >= f_f->seek + f_f->size )
{
ret = fread( ptr, 1, size, f_f->fid );
/*
if ( ret != size )
{
ERROR("%d != %d\n", ret, size );
return -1;
}
else
*/
if ( ret < 0 )
{
ERROR("\n");
return ret;
}
} else
{
ERROR("\n");
}
} else
{
ERROR("file writable only");
}
}
return ret;
}
//---------------------------------------------------------------------
//not effective algo ofcourse, but who cares while no one cares
//read buffer and then find in buffer newline, calc nl position and
//do the job
size_t f_file_readl( f_file *f_f, size_t size, void *ptr )
{
size_t ret=-1;
//PRINT("\n");
if ( f_f )
{
int c=0;
size_t counter=0;
//fseek( f_f->fid, 0, SEEK_SET);
c = getc( f_f->fid );
while ( (c != '\n') && ( c != EOF ))
{
if ( counter < size )
{
((char *)(ptr))[counter] = (char)c;
counter++;
}
c = getc( f_f->fid );
}
if ( counter > 0 ) ret = counter;
}
return ret;
}
//---------------------------------------------------------------------
int f_file_size( f_file *f_f )
{
int ret=-1;
long old_seek;
//PRINT("\n");
if ( f_f )
{
//could make some logic break
if ( f_f->size < 0 )
{
old_seek = ftell( f_f->fid );
fseek( f_f->fid, 0, SEEK_END );
ret = ftell( f_f->fid );
fseek( f_f->fid, old_seek, SEEK_CUR );
}
}
return ret;
}
//f_file_read_bl();
//---------------------------------------------------------------------
size_t f_file_write( f_file *f_f, size_t size, void *ptr )
{
size_t ret = -1;
//PRINT("\n");
if ( f_f )
{
if ((f_f->flags == F_FILE_WRITE) ||
(f_f->flags == F_FILE_RW) )
{
ret = fwrite( ptr, 1, size, f_f->fid );
}
}
return ret;
}
//f_file_write_bl();
//---------------------------------------------------------------------
f_file* f_file_open( const char *fname, int flags )
{
f_file *ret = NULL;
char *f_flags_write="w";
char *f_flags_read="r";
char *f_flags_rw="r+";
char *f_flags_tmp=NULL;
//PRINT("\n");
if ( fname != NULL )
{
ret = malloc( sizeof( f_file ) );
if ( ret == NULL )
{
ERROR("Cannot alloc mem\n");
return NULL;
}
memset( ret, 0, sizeof( f_file ));
f_file_null( ret );
switch ( flags )
{
case F_FILE_READ:
f_flags_tmp = f_flags_read;
ret->flags = F_FILE_READ;
break;
case F_FILE_WRITE:
f_flags_tmp = f_flags_write;
ret->flags = F_FILE_WRITE;
break;
case F_FILE_RW:
f_flags_tmp = f_flags_rw;
ret->flags = F_FILE_RW;
break;
default:
ERROR("Unknown flag for opening \n");
goto exit_close_f;
}
ret->fid = fopen( fname, f_flags_tmp );
if ( ret->fid == NULL )
{
ERROR("Cannot open file\n");
goto exit_close_f;
}
ret->size = f_file_size( ret );
fseek( ret->fid, 0, SEEK_SET );
}
return ret;
exit_close_f:
if ( ret != NULL )
free( ret );
return NULL;
}
//---------------------------------------------------------------------
int f_file_close( f_file *f_f )
{
//PRINT("\n");
if ( f_f )
{
fclose( f_f->fid );
free( f_f );
f_f = NULL;
}
}
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