Smac definition

is a SMall Ansi C interpreter developed to extend editor services, but it is also possible to use outside (see §9 page ).

This chapter gives definitions of functions independently of , valid whether they are used within or without . The next chapter will describe their interface with .

implements a subset of the ANSI C standard, but to be fully functional it also implements some extensions of it:

• In traditional C, a program has a single entry point named main(). In , each function is an entry point, thus a main() definition is not required, besides does not know the name main.
•   You can evaluate a sequence of expressions outside any function definition. These expressions are placed between braces as a function body, and are named free expressions. The only restriction is that you cannot put any declaration in a free expression, for instance to define a local variable.

  For example, you can directly write:

  
  
  

• There is no programming time and run time (in the C usual sense) in . As in LISP you define functions and global variables, or execute free expressions when and where you want (providing that all necessary global definitions are made).
• Files are not separately considered, as soon as you declare or define functions and variables, you increase your global environment .

To manually interrupt  a execution, hit Ctrl-c  in the window where or just is running (kill -2 on pid). To stop current execution by program (as with exit() UNIX system function but without or ending) see error() §6.6.7 page .

According to the compiling flags (see §9 page ) can check all your memory access/modification to avoid core dump or other things. In this case, all allocated objects are taken from a special memory area whose default size    is 2^18 bytes under , and 2^15 bytes otherwise. You can update the SMACMEMORYSIZE environment variable to increase it, its value must be a power of two (default 2^18 or 2^15).

In all cases the stack size is 1024 words by default. To increase it update the SMACSTACKSIZE    environment variable; its value corresponds to the number of words it can contain (a word permits to memorize a char, an int or a pointer).

 
• Function definition
• Global variable definition
• Preprocessor
• Types
• Keywords
• Predefined functions
  • Formatted output conversion
  • Memory
  • Strings
  • Redefinition
  • Function
  • Execution profile
  • Others