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# operator escapes backslashes outside string literals #714
Description
When the # operator turns a macro argument into a string, simplecpp puts a \ before every \, " and ' in the argument. The standard says a \ is inserted only before each " and \ that is part of a string literal or
character constant (C11 §6.10.3.2p2, C++ [cpp.stringize]). Other backslashes are copied unchanged, and ' is never escaped.
Example
#define str(x) #x
str(\n)
str(: @\n)
str('\4')| Input | Expected (gcc, clang) | Actual (simplecpp) |
|---|---|---|
str(\n) |
"\n" |
"\\n" |
str(: @\n) |
": @\n" |
": @\\n" |
str('\4') |
"'\\4'" |
"\'\\4\'" |
str(: @\n) is taken from the standard's own example (C11 §6.10.3.5, example 4). The clang testsuite case c99-6_10_3_4_p6.c fails for the same reason.
Activity
Fix #714 (# operator escapes backslashes outside string literals)
Fix cppcheck-opensource#714 (# operator escapes backslashes outside s…