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Diffstat (limited to 'Documentation/printk-formats.txt')
| -rw-r--r-- | Documentation/printk-formats.txt | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt index b4498218c47..5a615c14f75 100644 --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -70,6 +70,38 @@ DMA addresses types dma_addr_t: For printing a dma_addr_t type which can vary based on build options, regardless of the width of the CPU data path. Passed by reference. +Raw buffer as an escaped string: + + %*pE[achnops] + + For printing raw buffer as an escaped string. For the following buffer + + 1b 62 20 5c 43 07 22 90 0d 5d + + few examples show how the conversion would be done (the result string + without surrounding quotes): + + %*pE "\eb \C\a"\220\r]" + %*pEhp "\x1bb \C\x07"\x90\x0d]" + %*pEa "\e\142\040\\\103\a\042\220\r\135" + + The conversion rules are applied according to an optional combination + of flags (see string_escape_mem() kernel documentation for the + details): + a - ESCAPE_ANY + c - ESCAPE_SPECIAL + h - ESCAPE_HEX + n - ESCAPE_NULL + o - ESCAPE_OCTAL + p - ESCAPE_NP + s - ESCAPE_SPACE + By default ESCAPE_ANY_NP is used. + + ESCAPE_ANY_NP is the sane choice for many cases, in particularly for + printing SSIDs. + + If field width is omitted the 1 byte only will be escaped. + Raw buffer as a hex string: %*ph 00 01 02 ... 3f %*phC 00:01:02: ... :3f |