![]() WHILE BYTE PTR 0 INC ECX // propagate to tail. Using either a generic foldr(f, a, xs) - reverse1 :: -> on reverse1 ( xs ) script rev on |λ| ( a, x ) a & x end |λ| end script if class of xs is text then foldr ( rev, update newStr oldStr = newStr view : String -> Html String view forward = div ( ] ++ ]) myStyle : Attribute msg myStyle = style ĭYNASM RevStr ( BYVAL s AS STRING ) AS STRING // get length of string // divide by two // setup pointers to head and tail // iterate from 1 to (length \ 2) // swap head with tail // increment head pointer // decrement tail pointer ENTER 0, 0 // = PUSH EBP: MOV EBP, ESP PUSH EBX // by Windows convention EBX, EDI, ESI must be saved before modification MOV EAX, s // get string pointer MOV ECX, EAX // duplicate it. In 8th strings are UTF-8 and the language retains characters per-se: ![]() Test code (CP/M): ask the user for a string, and reverse itīuf: dsđ28 one extra byte that will remain 0Ĭall strrev0 0-terminated due to buffer definition arrayrev: reverse bytes starting at DE and ending at HL ![]() strrev: reverse a string terminated by the value in A strrev0: reverse a zero-terminated string Implementation is beyond the scope of the task. While it wouldn't be impossible to do, I think writing a full UTF-8 These are not supported, as they would be completely different routines, though the arrayrevĮntry point will reverse a byte array if you already have its start and end. (making it unnecessary to scan through the string to find the end, but capping string size atĢ55 bytes), or even storing tuples of lengths and pointers (easy for a garbage collector to manage). The end (saves a byte per string, but halves the character set size), or prepending the length There were other ways of representing strings, like setting the high bit of the last character to mark This routine also allows you to set it yourself, using the A register. The programmer to set it himself with a system call!) Therefore, to allow for some flexibility, Zero-terminated strings were already in use by the C language (and therefore, programs written in it).ĬP/M, on the other hand, used $ as a string terminator. This is a routine that reverses a string with a terminator in place.īack when the 8080 was commonly used, there wasn't really a set standard about how to store strings. This program reverses each line of its input.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |