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Added error when opening multiple files with a statically allocated buffer

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Opening multiple files simultaneously is not supported without dynamic memory,
but the previous behaviour would just let the files overwrite each other, which
could lead to bad errors down the line

found by husigeza
This commit is contained in:
Christopher Haster
2018-04-29 16:45:14 +03:00
committed by GitHub
parent 9637b96069
commit 64a1997da3
1 changed files with 4 additions and 0 deletions
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4
lfs.c
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@@ -1355,6 +1355,10 @@ int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
// allocate buffer if needed // allocate buffer if needed
file->cache.block = 0xffffffff; file->cache.block = 0xffffffff;
if (lfs->cfg->file_buffer) { if (lfs->cfg->file_buffer) {
if (lfs->files) {
// already in use
return LFS_ERR_NOMEM;
}
file->cache.buffer = lfs->cfg->file_buffer; file->cache.buffer = lfs->cfg->file_buffer;
} else if ((file->flags & 3) == LFS_O_RDONLY) { } else if ((file->flags & 3) == LFS_O_RDONLY) {
file->cache.buffer = lfs_malloc(lfs->cfg->read_size); file->cache.buffer = lfs_malloc(lfs->cfg->read_size);