Added support for c and l flags

go.mod

@@ -0,0 +1,3 @@
+module gitea.paas.celticinfo.fr/oabrivard/gowc
+
+go 1.21.3

main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+)
+
+func byteCounter(f *os.File) {
+	fileInfo, err := f.Stat()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	fmt.Println(fileInfo.Size())
+}
+
+func lineCounter(f io.Reader) {
+	buf := make([]byte, 32*1024)
+	count := 0
+	lineSep := []byte{'\n'}
+
+	for {
+		c, err := f.Read(buf)
+		count += bytes.Count(buf[:c], lineSep)
+
+		switch {
+		case err == io.EOF:
+			fmt.Println(count)
+			return
+
+		case err != nil:
+			fmt.Fprintf(os.Stderr, "error: %v\n", err)
+			os.Exit(1)
+		}
+	}
+}
+
+func main() {
+
+	cFlag := flag.Bool("c", false, "print the byte counts")
+	lFlag := flag.Bool("l", false, "print the line counts")
+	flag.Parse()
+	fileName := flag.Arg(0)
+
+	if len(fileName) == 0 {
+		fmt.Fprintf(os.Stderr, "gowc [flags] filename\n")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	f, err := os.Open(fileName)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+	defer f.Close()
+
+	switch {
+	case *cFlag:
+		byteCounter(f)
+	case *lFlag:
+		lineCounter(f)
+	}
+}