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So I decided it was too dangerous.

This commit is contained in:
Thomas Touhey 2016-11-20 02:17:14 +01:00
parent 40bbacce49
commit 329640d1ac
1 changed files with 1 additions and 35 deletions
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36
include/libg1m.h
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@ -99,8 +99,7 @@ typedef struct {
} g1m_mcs_cell_t;
/* mcs file */
# define g1m_has_password(F) g1m_get_password(F)[0]
//# define g1m_has_password(F) (*(F).password)
# define g1m_has_password(F) (F)->password[0]
typedef struct {
/* directory name */
char dirname[9];
@ -199,39 +198,6 @@ int g1m_fctomb(char *s, FONTCHARACTER fc);
size_t g1m_mbstofcs(FONTCHARACTER *dst, const char *src, size_t n);
size_t g1m_fcstombs(char *dst, const FONTCHARACTER *src, size_t n);
/* ************************************************************************** */
/* Other things */
/* ************************************************************************** */
/* Advanced password getting macro.
* Okay, so this is an experiment and hack of the C11 `_Generic` feature.
*
* I wanted people to be able to pass either a pointer to a `g1m_mcsfile_t`
* structure, or a `g1m_mcsfile_t` structure directly.
* But C11 says `_Generic` branches must all be valid. So it couldn't be just
* as simple as:
*
* _Generic((F), g1m_mcsfile_t: (F).password, g1m_mcsfile_t*: (F)->password)
*
* So I had to trick the compiler. Getting the adress is valid for the
* structure and the pointer to the structure, so we get the double pointer
* to the structure, and we send that as a `void*` to a static inline function
* that will go through the double pointers to get the password field.
*
* Note that calculation results will not work here. (e.g. file + 1 - 1)
*
* Please enjoy the mess. */
# if __STDC_VERSION__ >= 201112L
static inline char *__g1m_get_password(void *mcsfile) {
return ((*((g1m_mcsfile_t**)mcsfile))->password);
}
# define g1m_get_password(F) (char*)_Generic((F), \
g1m_mcsfile_t*: __g1m_get_password(&(F)), \
g1m_mcsfile_t: __g1m_get_password((void*[]){&(F)}), \
default: NULL)
# else
# define g1m_get_password(F) (char*)((F)->password)
# endif
# ifdef __cplusplus
}
# endif