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authorKees Cook <keescook@chromium.org>2015-09-09 22:37:14 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-10 20:29:01 (GMT)
commitd89a3f7335bb5d9e572ecc287b300161200364eb (patch)
tree746c14eb344942bb90b15961f765ecb1a4b2eb30 /lib
parentcdf17449af1d9b596742c260134edd6c1fac2792 (diff)
lib/string_helpers: clarify esc arg in string_escape_mem
The esc argument is used to reduce which characters will be escaped. For example, using " " with ESCAPE_SPACE will not produce any escaped spaces. Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Mathias Krause <minipli@googlemail.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/string_helpers.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index c98ae81..0a307a9 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -410,7 +410,7 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
* @dst: destination buffer (escaped)
* @osz: destination buffer size
* @flags: combination of the flags (bitwise OR):
- * %ESCAPE_SPACE:
+ * %ESCAPE_SPACE: (special white space, not space itself)
* '\f' - form feed
* '\n' - new line
* '\r' - carriage return
@@ -432,8 +432,10 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
* all previous together
* %ESCAPE_HEX:
* '\xHH' - byte with hexadecimal value HH (2 digits)
- * @esc: NULL-terminated string of characters any of which, if found in
- * the source, has to be escaped
+ * @esc: NULL-terminated string containing characters used to limit
+ * the selected escape class. If characters are included in @esc
+ * that would not normally be escaped by the classes selected
+ * in @flags, they will be copied to @dst unescaped.
*
* Description:
* The process of escaping byte buffer includes several parts. They are applied
@@ -441,7 +443,7 @@ static bool escape_hex(unsigned char c, char **dst, char *end)
* 1. The character is matched to the printable class, if asked, and in
* case of match it passes through to the output.
* 2. The character is not matched to the one from @esc string and thus
- * must go as is to the output.
+ * must go as-is to the output.
* 3. The character is checked if it falls into the class given by @flags.
* %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
* character. Note that they actually can't go together, otherwise

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