C Until It Is No Longer C
By Artyom Bologov
We have to admit that C is inherently/potentially ugly. One can try making it prettier, but there's only so much one can do to C without compromizing its nature. That's what I'm going to do here—stretching the limits of what C is, introducing some prettier things. If you're a C programmer (like me), you might end up horrified by what I'm doing. Otherwise, sit back and watch how readable C can become!
Standard Headers: Booleans and Nicer Logic
C23 made booleans part of the language.
Which is a good direction.
But what if I don't want to wait for C23 to be rolled out in GCC or Clang?
Well, I can always define some booleans myself!
#if (__STDC_VERSION__ >= 199901L && __STDC_VERSION__ < 202000L)
#include <stdbool.h>
#elif __STDC_VERSION__ < 199901L
#define true 1
#define false 0
typedef int _Bool;
#define bool _Bool
#endif
Et voilá!
Now we can do proper booleans:
// Check whether the char is a control one
// Yes, I know of iscntrl, bear with me
bool
iscontrol (unsigned int c)
{
return (127 == c || c < 32);
}
Yes, implicit conversion to booleans. Because booleans are nothing but unsigned integers 1 and 0. Now what doesn't work for me is this ugly double vertical bar. I want some Pythonesque boolean logic!
It turns out I can have this nicer boolean logic, just one #include away!
#include <iso646.h>
#define eq ==
#define bitnot ~
#define bitxor ^
I'm also defining some missing bits and fixing the inconsistently named
xor and compl.
With these, iscontrol becomes even more readable!
bool
iscontrol (unsigned int c)
{
return (127 eq c or c < 32);
}
eq feels sligtly off here.
Why not define another macro for it?
A couple of macros, actually.
#define is ==
#define isnt !=
And use it like:
return c is 127 or c < 32;
Notice that I switched the order of arguments to a more intuitive one.
Putting a constant before the equality operator is no longer necessary.
(C programmers do that to avoid typos like c = 127,
relying on compiler to scream when it sees 127 = c.)
After all, the spelled-out operator cannot end up as assignment.
Readability and reliability win.
Nicer Types: Fixed Width and Custom Shortcuts
But it never hurts to use these more:
#include <stdint.h>
And then, we can go even further, inspired by brevity of uint8_t:
typedef unsigned char uchar;
typedef unsigned char ubyte;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;
Going even further, here are some more Go-inspired types:
typedef char* string;
typedef char byte;
typedef char* bytes;
typedef void* any;
bool
iscontrol (byte c) // Or uchar, or uint
{
return c is 127 or c < 32;
}
Type Inference
Another nice-but-not-quite-C thing C23 added is... type inference!
You may disagree with this decision, but it certainly is nice to have.
So let's add it:
#if defined(__GNUC__) || defined(__GNUG__)
#define var __auto_type
#define let __auto_type
#define local __auto_type
#elif __STDC_VERSION__ > 201710L || defined(__cplusplus)
#define var auto
#define let auto
#define local auto
#endif
And use it too!
bool
iscontrol (byte c)
{
var delete = 127,
space = ' ';
return c is delete or c < space;
}
Okay, I should probably stop here. Both because the example is no longer improvable. And because most of the readers are already hemorrhaging. Sorry! I could've promised I won't do it again, but alas. Have a good rest of the day with this newly acquired phobia.
Oh and check out Pretty.C, my project making C even further from God!