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fileutil.go
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fileutil.go
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/**
* This file is a part of the poni project and is licensed under the MIT license.
* See LICENSE.md for details.
*
* fileutil.go
* Contains the file utility functions.
*
* @created 2023-08-20
*/
package main
import (
"fmt"
"os"
)
// fileExists
// Checks if a file exists.
// Returns true if it exists, false if not.
func fileExists(filename string) bool {
_, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return true
}
// readFile
// Reads a file and returns the contents.
// Returns the contents of the file and an error.
func readFile(path string) ([]byte, error) {
if !fileExists(path) {
return nil, os.ErrNotExist
}
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer func(file *os.File) {
err := file.Close()
if err != nil {
fmt.Println("Failed to close file")
}
}(file)
stat, err := file.Stat()
if err != nil {
return nil, err
}
size := stat.Size()
data := make([]byte, size)
_, err = file.Read(data)
return data, err
}
// readStdin
// Reads from stdin and returns the contents.
// Returns the contents of stdin and an error.
func readStdin() ([]byte, error) {
stat, err := os.Stdin.Stat()
if err != nil {
return nil, err
}
size := stat.Size()
data := make([]byte, size)
_, err = os.Stdin.Read(data)
return data, err
}