headers: kref.h redux

[sfrench/cifs-2.6.git] / include / linux / seq_file.h

diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 0c6a86b795968621a107c2c8c611b5ef7d387516..8366d8f12e537ac9cfb3e9cc053371bcea174025 100644 (file)
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -35,6 +35,44 @@ struct seq_operations {
 
 #define SEQ_SKIP 1
 
+/**
+ * seq_get_buf - get buffer to write arbitrary data to
+ * @m: the seq_file handle
+ * @bufp: the beginning of the buffer is stored here
+ *
+ * Return the number of bytes available in the buffer, or zero if
+ * there's no space.
+ */
+static inline size_t seq_get_buf(struct seq_file *m, char **bufp)
+{
+       BUG_ON(m->count > m->size);
+       if (m->count < m->size)
+               *bufp = m->buf + m->count;
+       else
+               *bufp = NULL;
+
+       return m->size - m->count;
+}
+
+/**
+ * seq_commit - commit data to the buffer
+ * @m: the seq_file handle
+ * @num: the number of bytes to commit
+ *
+ * Commit @num bytes of data written to a buffer previously acquired
+ * by seq_buf_get.  To signal an error condition, or that the data
+ * didn't fit in the available space, pass a negative @num value.
+ */
+static inline void seq_commit(struct seq_file *m, int num)
+{
+       if (num < 0) {
+               m->count = m->size;
+       } else {
+               BUG_ON(m->count + num > m->size);
+               m->count += num;
+       }
+}
+
 char *mangle_path(char *s, char *p, char *esc);
 int seq_open(struct file *, const struct seq_operations *);
 ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);