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mufs: implement mufs_seek() to seek and tell the position within a file

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S.J.R. van Schaik 2017-06-12 13:04:46 +02:00
parent 9ef95baac3
commit a20c1a8ed4
2 changed files with 21 additions and 0 deletions
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1
include/fs/mufs.h
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@ -42,5 +42,6 @@ int mufs_mkdir(struct mufs *fs, const char *path);
int mufs_create(struct mufs *fs, const char *path); int mufs_create(struct mufs *fs, const char *path);
struct mufs_file *mufs_open(struct mufs *fs, const char *path, int mode); struct mufs_file *mufs_open(struct mufs *fs, const char *path, int mode);
void mufs_close(struct mufs_file *file); void mufs_close(struct mufs_file *file);
long mufs_seek(struct mufs_file *file, long offset, int whence);
size_t mufs_read(struct mufs_file *file, void *data, size_t len); size_t mufs_read(struct mufs_file *file, void *data, size_t len);
size_t mufs_write(struct mufs_file *file, const void *data, size_t len); size_t mufs_write(struct mufs_file *file, const void *data, size_t len);

20
source/fs/mufs/file.c
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@ -54,6 +54,26 @@ void mufs_close(struct mufs_file *file)
free(file); free(file);
} }
long mufs_seek(struct mufs_file *file, long offset, int whence)
{
if (!file)
return -1;
switch (whence) {
case SEEK_SET: break;
case SEEK_CUR: offset = file->va + offset; break;
case SEEK_END: offset = file->tree->file_size; break;
default: return -1;
}
if (offset > file->tree->file_size || offset >= UINT32_MAX)
return -1;
file->va = offset;
return offset;
}
size_t mufs_read(struct mufs_file *file, void *data, size_t len) size_t mufs_read(struct mufs_file *file, void *data, size_t len)
{ {
size_t ret; size_t ret;