diff options
Diffstat (limited to 'include/linux/printbuf.h')
| -rw-r--r-- | include/linux/printbuf.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/printbuf.h b/include/linux/printbuf.h index 382863afa7fc..1e43c4789136 100644 --- a/include/linux/printbuf.h +++ b/include/linux/printbuf.h @@ -36,6 +36,23 @@ * memory allocation failure we usually don't want to bail out and unwind - we * want to print what we've got, on a best-effort basis. But code that does want * to return -ENOMEM may check printbuf.allocation_failure. + * + * Indenting, tabstops: + * + * To aid is writing multi-line pretty printers spread across multiple + * functions, printbufs track the current indent level. + * + * printbuf_indent_push() and printbuf_indent_pop() increase and decrease the current indent + * level, respectively. + * + * To use tabstops, set printbuf->tabstops[]; they are in units of spaces, from + * start of line. Once set, prt_tab() will output spaces up to the next tabstop. + * prt_tab_rjust() will also advance the current line of text up to the next + * tabstop, but it does so by shifting text since the previous tabstop up to the + * next tabstop - right justifying it. + * + * Make sure you use prt_newline() instead of \n in the format string for indent + * level and tabstops to work corretly. */ #include <linux/kernel.h> @@ -45,18 +62,29 @@ struct printbuf { char *buf; unsigned size; unsigned pos; + unsigned last_newline; + unsigned last_field; + unsigned indent; /* * If nonzero, allocations will be done with GFP_ATOMIC: */ u8 atomic; bool allocation_failure:1; bool heap_allocated:1; + u8 tabstop; + u8 tabstops[4]; }; int printbuf_make_room(struct printbuf *, unsigned); const char *printbuf_str(const struct printbuf *); void printbuf_exit(struct printbuf *); +void prt_newline(struct printbuf *); +void printbuf_indent_add(struct printbuf *, unsigned); +void printbuf_indent_sub(struct printbuf *, unsigned); +void prt_tab(struct printbuf *); +void prt_tab_rjust(struct printbuf *); + /* Initializer for a heap allocated printbuf: */ #define PRINTBUF ((struct printbuf) { .heap_allocated = true }) @@ -187,6 +215,8 @@ static inline void printbuf_reset(struct printbuf *buf) { buf->pos = 0; buf->allocation_failure = 0; + buf->indent = 0; + buf->tabstop = 0; } /** |