c89

For the sake of education, and programming practice, I'd like to write a simple library that can handle raw keyboard input, and output to the terminal in 'real time'. I'd like to stick with ansi C as much as possible, I just have no idea where to start something like this. I've done several google searches, and 99% of the results use libraries, or are for C++. I'd really like to get it working in windows, then port it to OSX when I have the time. Sticking with Standard C as much as possible is a good idea, but you are not going to get very far with your adopted task using just Standard C. The

As I understand it, the C specification says that type int is supposed to be the most efficient type on target platform that contains at least 16 bits. Isn't that exactly what the C99 definition of int_fast16_t is too? Maybe they put it in there just for consistency, since the other int_fastXX_t are needed? Update To summarize discussion below: My question was wrong in many ways. The C standard does not specify bitness for int . It gives a range [-32767,32767] that it must contain. I realize at first most people would say, "but that range implies at least 16-bits!" But C doesn't require two's

Is the difference of two non-void pointer variables defined (per C99 and/or C++98) if they are both NULL valued? For instance, say I have a buffer structure that looks like this: struct buf { char *buf; char *pwrite; char *pread; } ex; Say, ex.buf points to an array or some malloc'ed memory. If my code always ensures that pwrite and pread point within that array or one past it, then I am fairly confident that ex.pwrite - ex.pread will always be defined. However, what if pwrite and pread are both NULL. Can I just expect subtracting the two is defined as (ptrdiff_t)0 or does strictly compliant

Piece of code : long rangeVar = 0; rangeVar = atol(p_value); if (rangeVar >= -2147483648 && rangeVar <= 2147483647) On compiling I get: warning: this decimal constant is unsigned only in ISO C90 Thanks in Advance The rules for the types of decimal integer constants changed between the 1990 and 1999 editions of the ISO C standard. In the 1990 version, an unsuffixed decimal integer constant's type is the first of int , long int , or unsigned long int in which its value can be represented. (C90 had no long long or unsigned long long type). In the 1999 and 2011 versions, its type is one of int ,

I'm looking for a free copy version of the C89/C90 standard , but I can't find it anywhere! Why is so hard to find it? C99 and C11 standards are very easy to get a copy of on Internet. Even in Stack Overflow question Where do I find the current C or C++ standard documents? and in The C Standard, Obtaining the Standard don't contain what I'm looking for. Web searches didn't helped either, nor Open Standards . R.. You can find nice HTML versions of C89, C99, and C11, as well as some of the official draft PDF files they're generated from, here: http://port70.net/~nsz/c/ Some other useful direct