diff options
| -rw-r--r-- | include/linux/pretty-printers.h | 10 | ||||
| -rw-r--r-- | lib/Makefile | 2 | ||||
| -rw-r--r-- | lib/pretty-printers.c | 58 |
3 files changed, 69 insertions, 1 deletions
diff --git a/include/linux/pretty-printers.h b/include/linux/pretty-printers.h new file mode 100644 index 000000000000..2e8b6b4426d2 --- /dev/null +++ b/include/linux/pretty-printers.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ +/* Copyright (C) 2022 Kent Overstreet */ + +#ifndef _LINUX_PRETTY_PRINTERS_H +#define _LINUX_PRETTY_PRINTERS_H + +void pr_string_option(struct printbuf *, const char * const[], size_t); +void pr_bitflags(struct printbuf *, const char * const[], u64); + +#endif /* _LINUX_PRETTY_PRINTERS_H */ diff --git a/lib/Makefile b/lib/Makefile index 31a3904edaae..98e9aefe6206 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -34,7 +34,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \ nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o \ - buildid.o printbuf.o + buildid.o printbuf.o pretty-printers.o lib-$(CONFIG_PRINTK) += dump_stack.o lib-$(CONFIG_SMP) += cpumask.o diff --git a/lib/pretty-printers.c b/lib/pretty-printers.c new file mode 100644 index 000000000000..d794648ef913 --- /dev/null +++ b/lib/pretty-printers.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: LGPL-2.1+ +/* Copyright (C) 2022 Kent Overstreet */ + +#include <linux/kernel.h> +#include <linux/printbuf.h> + +/** + * pr_string_option - Given a list of strings, print out the list and indicate + * which option is selected, with square brackets (sysfs style) + * + * @out: The printbuf to output to + * @list: List of strings to choose from + * @selected: The option to highlight, with square brackets + */ +void pr_string_option(struct printbuf *out, + const char * const list[], + size_t selected) +{ + size_t i; + + for (i = 0; list[i]; i++) { + if (i) + pr_char(out, ' '); + if (i == selected) + pr_char(out, '['); + pr_str(out, list[i]); + if (i == selected) + pr_char(out, ']'); + } +} +EXPORT_SYMBOL(pr_string_option); + +/** + * pr_bitflags: Given a bitmap and a list of names for each bit, print out which + * bits are on, comma separated + * + * @out: The printbuf to output to + * @list: List of names for each bit + * @flags: Bits to print + */ +void pr_bitflags(struct printbuf *out, + const char * const list[], u64 flags) +{ + unsigned bit, nr = 0; + bool first = true; + + while (list[nr]) + nr++; + + while (flags && (bit = __ffs(flags)) < nr) { + if (!first) + pr_buf(out, ","); + first = false; + pr_str(out, list[bit]); + flags ^= 1 << bit; + } +} +EXPORT_SYMBOL(pr_bitflags); |