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fix https://github.com/pkgconf/pkgconf/issues/291
As defined in the C standard:
In all cases the argument is an int, the value of which shall
be representable as an unsigned char or shall equal the value
of the macro EOF. If the argument has any other value, the
behavior is undefined.
This is because they're designed to work with the int values returned
by getc or fgetc; they need extra work to handle a char value.
If EOF is -1 (as it almost always is), with 8-bit bytes, the allowed
inputs to the ctype(3) functions are:
{-1, 0, 1, 2, 3, ..., 255}.
However, on platforms where char is signed, such as x86 with the
usual ABI, code like
char *ptr = ...;
... isspace(*ptr) ...
may pass in values in the range:
{-128, -127, -126, ..., -2, -1, 0, 1, ..., 127}.
This has two problems:
1. Inputs in the set {-128, -127, -126, ..., -2} are forbidden.
2. The non-EOF byte 0xff is conflated with the value EOF = -1, so
even though the input is not forbidden, it may give the wrong
answer.
Casting char to unsigned int first before passing the result to
ctype(3) doesn't help: inputs like -128 are unchanged by this cast,
because (on a two's-complement machine with 32-bit int and unsigned
int), converting the signed char with integer value -128 to unsigned
int gives integer value 2^32 - 128 = 0xffffff80, which is out of
range, and which is converted in int back to -128, which is also out
of range.
It is necessary to cast char inputs to unsigned char first; you can
then cast to unsigned int if you like but there's no need because the
functions will always convert the argument to int by definition. So
the above fragment needs to be:
char *ptr = ...;
... isspace((unsigned char)*ptr) ...
This patch changes unsigned int casts to unsigned char casts, and
adds unsigned char casts where they are missing.
Given the following .pc fragment:
includedir=/mingw64/include
Cflags: -I${includedir} -I${includedir}/taglib
Should includedir be assigned the value 'C:/Program\ Files/Git/mingw64/include', the expansion of ${includedir} will be chopped off after the first space:
Cflags: -IC:/Program\
With this patch, the expansion is corrected:
Cflags: -IC:/Program\ Files/Git/mingw64/include -IC:/Program\ Files/Git/mingw64/include/taglib
Create spaces-in-paths.pc
Instead of attempting to figure out what the paths will be, take the
returned file object and pass that around, meson will then automatically
figure out the correct paths.
The latter doesn't work correctly when being used as a subproject, as it
returns the *absolute* root. So if pkgconf is being built as part of
muon, then it will return muon's source root. current_source_dir, on the
other hand returns the directory correctly whether being built as a
subproject or superproject.
Kai Pastor
Ariadne Conill
Dylan Baker