On branch read-file-error-check

Changes to be committed:
	modified:   .gitignore
	new file:   main.go
		New Functions:
			Inelegant hex->dot-decimal address translation solution
This commit is contained in:
Mike Holloway 2021-06-24 22:23:14 -04:00
parent 173e354269
commit 828a0193aa
2 changed files with 62 additions and 0 deletions

1
.gitignore vendored
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@ -1 +1,2 @@
.*.sw* .*.sw*
main

61
main.go Normal file
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package main
import (
"fmt"
"strings"
"regexp"
"io/ioutil"
"encoding/hex"
)
func main() {
// How to split on space-delimited fields, then colon-delimited fields?
// How to turn this byte into a string?
// /proc/net/tcp hex addresses need to be reversed two-character-wise
// and then converted byte by byte (2 char at a time)
//fmt.Println(convert_address(reverse_string(reverse_bytes("0100007F"))))
read_tcp_file("/proc/net/tcp")
}
func check(e error) {
if e != nil {
panic(e)
}
}
// Take a string, create a rune slice, and use a loop to reverse it character-wise.
func reverse_bytes(s string) string {
runes := []rune(s)
for i, j := len(runes)-2, len(runes)-1; j > 0; i, j = i-2, j-2 {
runes[i], runes[j] = runes[j], runes[i]
}
return string(runes)
}
func reverse_string(s string) string {
runes := []rune(s)
for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
runes[i], runes[j] = runes[j], runes[i]
}
return string(runes)
}
// Store data function
// Loads all fields and subfields into storage (memory? where?)
// State check function
// hash each line, use to determine new lines, convert to readable, and print
func convert_address(address string) []byte {
output, err := hex.DecodeString(address)
check(err)
return output
}
func read_tcp_file(connections_file_path string) string {
data, err := ioutil.ReadFile(connections_file_path)
check(err)
fmt.Println("Data file read successfully.\n")
return string(data)
}