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Stream I/O

L1

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StreamIO1.swift
#!/usr/bin/env swift;
/******************************************************************************
 * This program simply copies an input stream to the console character by
 * character like the Unix 'cat' program.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import Foundation
import Utils

func main() -> Void {
	var c:Int?
	c = Utils.getchar()
	while c != nil {
		print(Utils.chr(c!), terminator: "")
		c = Utils.getchar()
	}
	exit(EXIT_SUCCESS)
}
main()
Output
$ swiftc StreamIO1.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation) $ swiftc StreamIO1.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation)
StreamIO2.swift
#!/usr/bin/env swift;
/******************************************************************************
 * This program simply copies an input stream to the console line by line.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import Foundation

func main() -> Void {
	var line:String?
	line = (readLine(strippingNewline: true))
	while line != nil {
		print(line!)
		line = (readLine(strippingNewline: true))
	}
	exit(EXIT_SUCCESS)
}
main()
Output
$ swiftc StreamIO2.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation) $ swiftc StreamIO2.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation)
StreamIO3.swift
#!/usr/bin/env swift;
/******************************************************************************
 * This program reads bytes from STDIN and prints them in decimal format.
 * 
 * Copyright © 2020 Richard Lesh.  All rights reserved.
 *****************************************************************************/

import Foundation
import Utils

func main() -> Void {
	var c:UInt8?
	var count:Int = 0
	c = Utils.getbyte(FileHandle.standardInput)
	while c != nil {
		print(String(c!) + " ", terminator: "")
		count += 1
		if count % 20 == 0 {
			print()
		}
		c = Utils.getbyte(FileHandle.standardInput)
	}
	if count % 20 != 0 {
		print()
	}
	exit(EXIT_SUCCESS)
}
main()
Output
$ swiftc StreamIO3.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation) $ swiftc StreamIO3.swift -I . -L . -lUtils error: link command failed with exit code 1 (use -v to see invocation) ld: library not found for -lUtils clang: error: linker command failed with exit code 1 (use -v to see invocation)
swift

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