Created
May 7, 2011 17:44
-
-
Save meijeru/960678 to your computer and use it in GitHub Desktop.
String manipulation functions in Red/System, first working version
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Red/System [ | |
Title: "String functions" | |
Purpose: {proposed library functions for c-string manipulation} | |
Author: "Rudolf W. MEIJER" | |
File: %stringf.reds | |
Version: 0.1.0 | |
Date: 27-May-2011 | |
] | |
#import [ | |
"msvcrt.dll" cdecl [ ; Windows | |
calloc: "calloc" [ ; Allocate zero-filled memory. | |
chunks [integer!] | |
size [integer!] | |
return: [c-string!] | |
] | |
free: "free" [ ; Recycle memory. | |
memory [c-string!] | |
] | |
memcpy: "memcpy" [ ; Copy memory range. | |
target [c-string!] | |
source [c-string!] | |
size [integer!] | |
return: [c-string!] | |
] | |
length?: "strlen" [ ; Return string length. | |
command [c-string!] | |
return: [integer!] | |
] | |
] | |
] | |
max: func [ | |
i1 [integer!] | |
i2 [integer!] | |
][ | |
either i1 > i2 [i1][i2] | |
] | |
min: func [ | |
i1 [integer!] | |
i2 [integer!] | |
][ | |
either i1 < i2 [i1][i2] | |
] | |
make-string: func [ | |
; allocates space for string | |
n [integer!] ; length of string | |
return: [c-string!] | |
][ | |
as c-string! calloc n + 1 1 | |
] | |
copy-part: func [ | |
; implements sub-stringing | |
s [c-string!] ; pointer to string to be copied | |
n [integer!] ; number of characters to be copied | |
return: [c-string!] ; a pointer to a new string | |
/local r [c-string!] | |
][ | |
n: max n 0 ; do not crash | |
n: min n length? s ; idem | |
r: make-string n | |
memcpy r s n | |
r | |
; note: the memory area pointed to by r has to be de-allocated | |
; by the user himself (no GC) | |
] | |
concat: func [ | |
; implements string concatenation | |
s1 [c-string!] ; pointer to the first string | |
s2 [c-string!] ; pointer to the second string | |
return: [c-string!] ; a pointer to a new string | |
/local r [c-string!] n1 [integer!] n2 [integer!] | |
][ | |
n1: length? s1 | |
n2: length? s2 | |
r: make-string (n1 + n2) | |
memcpy r s1 n1 | |
memcpy r + n1 s2 n2 | |
r | |
; note: the memory area pointed to by r has to be de-allocated | |
; by the user himself (no GC) | |
] | |
&: func [ | |
; infix version of concat | |
[infix] | |
s1 [c-string!] ; pointer to the first string | |
s2 [c-string!] ; pointer to the second string | |
return: [c-string!] ; a pointer to a new string | |
][ | |
concat s1 s2 | |
] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
PL/1 uses || for concatenation. Though that would only be obvious to people like me who have coded PL/1