kolibrios/programs/develop/metcc/trunk/libc/file/fopen.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
extern char __argv;
extern char __path;
char* getfullpath(const char *path){
int i,j,relpath_pos,localpath_size;
int filename_size;
char local_path;
char *programpath;
char *newpath;
i=0;
local_path=1; //enable local path
while((*(path+i)!='\0') || (*(path+i)!=0))
{
if (*(path+i)=='.')
{
if (*(path+i+1)=='/')
{ //detected relative path
relpath_pos=i+2;
local_path=0;
break;
}
}
if (*(path+i)=='/')
{ //disabple local path
local_path=0;
return(path);
}
i++;
}
filename_size=i;
programpath=&__path;
if (local_path==1)
{
i=0x400;
//find local path of program
while(*(programpath+i)!='/')
{
i--;
}
localpath_size=i;
newpath=malloc(0x400);
//copy local path to the new path
for(i=0;i<=localpath_size;i++)
{
*(newpath+i)=*(programpath+i);
}
//copy filename to the new path
for(i=0;i<filename_size;i++)
{
*(newpath+localpath_size+1+i)=*(path+i);
}
return(newpath);
}
//if we here than path is a relative
i=0x400;
//find local path of program
while(*(programpath+i)!='/')
{
i--;
}
localpath_size=i;
i=0;
//find file name size
while((*(path+relpath_pos+i)!='\0') || (*(path+relpath_pos+i)!=0))
{
i++;
}
filename_size=i;
newpath=malloc(0x400);
//copy local path to the new path
for(i=0;i<=localpath_size;i++)
{
*(newpath+i)=*(programpath+i);
}
//copy filename to the new path
for(i=0;i<filename_size;i++)
{
*(newpath+localpath_size+1+i)=*(path+relpath_pos+i);
}
return(newpath);
}
FILE* fopen(const char* filename, const char *mode)
{
FILE* res;
int imode;
imode=0;
if (*mode=='r')
{
imode=FILE_OPEN_READ;
mode++;
}else if (*mode=='w')
{
imode=FILE_OPEN_WRITE;
mode++;
}else if (*mode=='a')
{
imode=FILE_OPEN_APPEND;
mode++;
}else
return 0;
if (*mode=='t')
{
imode|=FILE_OPEN_TEXT;
mode++;
}else if (*mode=='b')
mode++;
if (*mode=='+')
{
imode|=FILE_OPEN_PLUS;
mode++;
}
if (*mode!=0)
return 0;
res=malloc(sizeof(FILE));
res->buffer=malloc(256);
res->buffersize=256;
res->filesize=0;
res->filepos=0;
res->mode=imode;
res->filename=getfullpath(filename);
if ((imode==FILE_OPEN_READ) || (imode==FILE_OPEN_APPEND))
{
res->filesize=_ksys_get_filesize(res->filename);
}
return res;
}