[hackers] [sbase] bc: Implement return statements || Roberto E. Vargas Caballero

From: <git_AT_suckless.org>
Date: Sun, 23 Nov 2025 20:38:54 +0100 (CET)

commit 9290ec59d5b94cf01c880e8c5538eaca8d6b55ba
Author: Roberto E. Vargas Caballero <k0ga_AT_shike2.net>
AuthorDate: Sun Nov 23 20:34:34 2025 +0100
Commit: Roberto E. Vargas Caballero <k0ga_AT_shike2.net>
CommitDate: Sun Nov 23 20:34:34 2025 +0100

    bc: Implement return statements
    
    When a return is found we have to go out of all the nested contexts
    and _ideally_ that number should be in nested, but we are including
    the function contexts here. Also, this makes clear that the
    implementation of break was wrong, because we have to find the nesting
    level of the previous loop to break it. Also, at this moment no
    semantic check is done to vaalidate that we are in a loop or even
    in a function, and it means that weird things can happen if we put
    a return out of a function scope.

diff --git a/bc.y b/bc.y
index 41b3282..951f283 100644
--- a/bc.y
+++ b/bc.y
_AT_@ -121,11 +121,11 @@ statlst : {$$ = code("");}
 
 stat : exprstat
         | STRING {$$ = code("[%s]P", $1);}
- | BREAK {$$ = code(" %dQ", nested);}
+ | BREAK {$$ = code(" %dQ", nested);} /* FIXME */
         | QUIT {quit();}
- | RETURN
- | RETURN '(' expr ')'
- | RETURN '(' ')'
+ | RETURN {$$ = code(" %dQ", nested);}
+ | RETURN '(' expr ')' {$$ = code(" %s %dQ", $3, nested);}
+ | RETURN '(' ')' {$$ = code(" %dQ", nested);}
         | FOR fordef stat {$$ = forcode($2, $3);}
         | IF cond stat {$$ = ifcode($2, $3);}
         | WHILE cond stat {$$ = whilecode($2, $3);}
Received on Sun Nov 23 2025 - 20:38:54 CET