source: cpp/frams/virtfile/stringfile.cpp @ 247

// This file is a part of the Framsticks GDK.
// Copyright (C) 1999-2014  Maciej Komosinski and Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#include "stringfile.h"
#include <stdio.h>
#include <errno.h> //EINVAL

size_t StringFILE::Vread(void *ptr, size_t size, size_t nmemb)
{
int have=(int)(str.len()-pos);
if (have<=0) return 0;
int need=(int)(size*nmemb);
if (need>have) {nmemb=have/size; need=(int)(size*nmemb);}
memcpy(ptr,((const char*)str)+pos,need);
pos+=need;
return nmemb;
}

int StringFILE::Vgetc()
{
if (pos >= str.len()) //...i znowu byl bug roku! :O
        return EOF;
else
        return str.operator[]((int)pos++);
}

char *StringFILE::Vgets(char *s, int size)
{
int have=str.len()-(int)pos;
if (have<=0) return 0;
if (size<0) size=0;
if (have>size) have=size-1;
const char* src=((const char*)str)+pos;
char *dest=s;
while(have-- > 0)
        {
        *(dest++) = *(src++); pos++;
        if (dest[-1]=='\n') break;
        }
*dest=0;
return s;
}

int StringFILE::Vseek(long offset, int whence)
{
switch(whence)
        {
        case SEEK_SET: pos=offset; break;
        case SEEK_CUR: pos+=offset; break;
        case SEEK_END: pos=str.len()-offset; break;
        default: return EINVAL;
        }
if (pos < 0) pos=0; else if (pos>str.len()) pos=str.len();
return 0;
}

const char StringFileSystem::PREFIX[]="string://";

bool StringFileSystem::isStringPath(const char* path)
{
return !strncmp(path,PREFIX,sizeof(PREFIX)-1);
}

VirtFILE *StringFileSystem::Vfopen(const char* path,const char*mode)
{
if ((*mode=='r') && isStringPath(path))
        {
        return new StringFILE2(SString(path+sizeof(PREFIX)-1));
        }
return (chain!=NULL) ? chain->Vfopen(path,mode) : NULL;
}

int StringFileSystem::Vfexists(const char* path)
{ return (chain!=NULL) ? chain->Vfexists(path) : 0; }

VirtDIR *StringFileSystem::Vopendir(const char* path)
{ return (chain!=NULL) ? chain->Vopendir(path) : NULL; }