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Added file size

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This commit is contained in:
adamdunkels 2007-03-22 23:55:03 +00:00
parent dd276a9c8a
commit ea6f2942bd
1 changed files with 23 additions and 4 deletions
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27
core/cfs/cfs-ram.c
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@ -30,7 +30,7 @@
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: cfs-ram.c,v 1.1 2006/06/17 22:41:15 adamdunkels Exp $
* $Id: cfs-ram.c,v 1.2 2007/03/22 23:55:03 adamdunkels Exp $
*/
#include "contiki.h"
@ -43,12 +43,13 @@ struct filestate {
#define FLAG_FILE_CLOSED 0
#define FLAG_FILE_OPEN 1
int fileptr;
int filesize;
};
#ifdef CFS_RAM_CONF_SIZE
#define CFS_RAM_SIZE CFS_RAM_CONF_SIZE
#else
#define CFS_RAM_SIZE 512
#define CFS_RAM_SIZE 4096
#endif
static struct filestate file;
@ -61,6 +62,9 @@ s_open(const char *n, int f)
if(file.flag == FLAG_FILE_CLOSED) {
file.flag = FLAG_FILE_OPEN;
file.fileptr = 0;
if((f & CFS_WRITE) && !(f & CFS_APPEND)) {
file.filesize = 0;
}
return 1;
} else {
return -1;
@ -79,6 +83,10 @@ s_read(int f, char *buf, unsigned int len)
if(file.fileptr + len > sizeof(filemem)) {
len = sizeof(filemem) - file.fileptr;
}
if(file.fileptr + len > file.filesize) {
len = file.filesize - file.fileptr;
}
if(f == 1) {
memcpy(buf, &filemem[file.fileptr], len);
@ -98,6 +106,11 @@ s_write(int f, char *buf, unsigned int len)
if(file.fileptr + len > sizeof(filemem)) {
len = sizeof(filemem) - file.fileptr;
}
if(file.fileptr + len > file.filesize) {
/* Extend the size of the file. */
file.filesize = file.fileptr + len;
}
if(f == 1) {
memcpy(&filemem[file.fileptr], buf, len);
@ -112,8 +125,8 @@ static int
s_seek(int f, unsigned int o)
{
if(f == 1) {
if(o > sizeof(filemem)) {
o = sizeof(filemem);
if(o > file.filesize) {
o = file.filesize;
}
file.fileptr = o;
return o;
@ -163,3 +176,9 @@ PROCESS_THREAD(cfs_ram_process, ev, data)
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
cfs_ram_init(void)
{
process_start(&cfs_ram_process, NULL);
}
/*---------------------------------------------------------------------------*/