Commits on Oct 14, 2023

1. bc: runtime error eats too much input …

   * In interactive bc, calling an undefined function does not cause a fatal error but an error is printed
   * YYERROR() is called in this situation, but it seems to break something
   * It appears that input tokens past the end of current statement are eaten by YYERROR
   * I observed this:
   
   ME> x = hey(1) + 2
   BC> No function hey() has been defined
   ME> x
   ME> x
   BC> 0
   ME> quit
   
   * After the error bc ignores the first time I type x (but when I ask again it politely answers)
   * Replacing YYERROR with "last INSTR" causes bc to jump past the final instruction in the current statement
   * Instructions in the subsequent statement are not destroyed
   * With this patch, the statement after the error is executed as I expect (this matches GNU bc)
   
   ME> x = 5
   BC> 5
   ME> y = heh(6) + 7
   BC> No function heh() has been defined
   ME> x
   BC> 5
   ME> y
   BC> 0
   ME> quit

   

   mknos authored Oct 14, 2023
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