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Added ftruncate().

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2827 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-11-11 14:40:18 +00:00
parent 228605dc7b
commit 68640edf90
3 changed files with 33 additions and 4 deletions
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27
firmware/common/file.c
View file

@ -90,7 +90,7 @@ int open(const char* pathname, int flags)
case O_WRONLY: case O_WRONLY:
openfiles[fd].write = true; openfiles[fd].write = true;
break; break;
default: default:
DEBUGF("Only O_RDONLY and O_WRONLY is supported\n"); DEBUGF("Only O_RDONLY and O_WRONLY is supported\n");
errno = EROFS; errno = EROFS;
@ -214,6 +214,31 @@ int remove(const char* name)
return rc; return rc;
} }
int ftruncate(int fd, unsigned int size)
{
int rc, sector;
sector = size / SECTOR_SIZE;
if (size % SECTOR_SIZE)
sector++;
rc = fat_seek(&(openfiles[fd].fatfile), sector);
if (rc < 0) {
errno = EIO;
return -1;
}
rc = fat_truncate(&(openfiles[fd].fatfile));
if (rc < 0) {
errno = EIO;
return -2;
}
openfiles[fd].size = size;
return 0;
}
static int readwrite(int fd, void* buf, int count, bool write) static int readwrite(int fd, void* buf, int count, bool write)
{ {
int sectors; int sectors;

1
firmware/common/file.h
View file

@ -56,6 +56,7 @@ extern int creat(const char *pathname, int mode);
extern int write(int fd, void* buf, int count); extern int write(int fd, void* buf, int count);
extern int remove(const char* pathname); extern int remove(const char* pathname);
extern int rename(const char* oldname, const char* newname); extern int rename(const char* oldname, const char* newname);
extern int ftruncate(int fd, unsigned int size);
#else #else
#ifdef WIN32 #ifdef WIN32

9
firmware/drivers/fat.c
View file

@ -1002,12 +1002,15 @@ int fat_truncate(struct fat_file *file)
{ {
/* truncate trailing clusters */ /* truncate trailing clusters */
int next; int next;
int last = get_next_cluster(file->lastcluster); int last = file->lastcluster;
while ( last && last != FAT_EOF_MARK ) {
LDEBUGF("fat_truncate(%x, %x)\n", file->firstcluster, last);
for ( last = get_next_cluster(last); last; last = next ) {
next = get_next_cluster(last); next = get_next_cluster(last);
update_fat_entry(last,0); update_fat_entry(last,0);
last = next;
} }
update_fat_entry(file->lastcluster,FAT_EOF_MARK);
return 0; return 0;
} }