diff options
| -rw-r--r-- | fs/debugfs/file.c | 57 |
1 files changed, 23 insertions, 34 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index a09d3c0aad6..c5ca6ae5a30 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -526,55 +526,44 @@ struct array_data { u32 elements; }; -static size_t format_array(char *buf, size_t bufsize, const char *fmt, - u32 *array, u32 array_size) +static size_t u32_format_array(char *buf, size_t bufsize, + u32 *array, int array_size) { size_t ret = 0; - u32 i; - for (i = 0; i < array_size; i++) { + while (--array_size >= 0) { size_t len; + char term = array_size ? ' ' : '\n'; - len = snprintf(buf, bufsize, fmt, array[i]); - len++; /* ' ' or '\n' */ + len = snprintf(buf, bufsize, "%u%c", *array++, term); ret += len; - if (buf) { - buf += len; - bufsize -= len; - buf[-1] = (i == array_size-1) ? '\n' : ' '; - } + buf += len; + bufsize -= len; } - - ret++; /* \0 */ - if (buf) - *buf = '\0'; - - return ret; -} - -static char *format_array_alloc(const char *fmt, u32 *array, - u32 array_size) -{ - size_t len = format_array(NULL, 0, fmt, array, array_size); - char *ret; - - ret = kmalloc(len, GFP_KERNEL); - if (ret == NULL) - return NULL; - - format_array(ret, len, fmt, array, array_size); return ret; } static int u32_array_open(struct inode *inode, struct file *file) { struct array_data *data = inode->i_private; - - file->private_data = format_array_alloc("%u", data->array, - data->elements); - if (!file->private_data) + int size, elements = data->elements; + char *buf; + + /* + * Max size: + * - 10 digits + ' '/'\n' = 11 bytes per number + * - terminating NUL character + */ + size = elements*11; + buf = kmalloc(size+1, GFP_KERNEL); + if (!buf) return -ENOMEM; + buf[size] = 0; + + file->private_data = buf; + u32_format_array(buf, size, data->array, data->elements); + return nonseekable_open(inode, file); } |