CODEWITHSUNDEEP
go
Peter
Peter

Reputation: 139

How to write to the console before a function panics?

In C you can use the function write() from the unistd.h library. write() is faster than printf(), and allows you to write to the standard output (or a file) before a Segfault breaks your code.

When debugging, I wish to write to the standard output before my Go code panics. In general, how do I do that?

I have the following code (to find the shortest word in a string of words) which is panicking and I want to isolate where, by inserting write methods.

func FindShort(s string) int {
  i := 0
  j := 0
  min := math.MaxInt32
  for true {
    for s[i] == ' ' {
      i++
      j++
    }
    for s[j] != ' ' && j < len(s) {
      j++
    }
    if j > i && (j - i) < min {
      min = j - i
    }
    i = j
    if j == len(s) {
      break
    }
  }
  return min
}

Upvotes: 1

Views: 285

Answers (2)

Pizza lord
Pizza lord

Reputation: 763

you could use a defered function that calls the recover function, the function below will result in "Recovered panic here"

defer func() {
    r := recover()
    if r != nil {
        fmt.Println("Recovered", r)
    }
}()

panic("panic here")

Upvotes: 1

Dippo
Dippo

Reputation: 320

Your code checks all lines if it contains a space, but it isn't checking if the line ends (end of line / end of file / line feed). There is a easier way to check what the shortest word is :

package main

import (
    "fmt"
    "math"
    "strings"
)

func main() {
    min := math.MaxInt32
    shortest := math.MaxInt32
    s := strings.Split("this is a test", " ")
    for key, value := range s {
        if len(value) < min {
            min = len(value)
            shortest = key
        }
    }
    fmt.Print(s[shortest])
}

Upvotes: 0

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