Print the part of the file starting at that position and proceed to the next newline character - C String

Description

Print the part of the file starting at that position and proceed to the next newline character

Demo Code

#include <stdio.h>
#include <stdlib.h>

#define SLEN 81/*  w w  w .  jav a 2s  .  c  o  m*/

void get(char * string, int n);

int main(void){
  FILE *fp;
  char filename[SLEN];
  long pos;
  int ch;

  printf("Enter a filename: ");
  get(filename, SLEN);

  if ((fp = fopen(filename, "r")) == NULL)
  {
    fprintf(stderr, "Could not open file %s.\n", filename);
    exit(EXIT_FAILURE);
  }

  printf("Enter a position: ");
  while (scanf("%ld", &pos) == 1){
    if (pos < 0)
      break;

    fseek(fp, pos, SEEK_SET);
    while ((ch = getc(fp)) != EOF && ch != '\n')
      putchar(ch);
    putchar('\n');

    printf("Enter a positition: ");
  }

  fclose(fp);
  return 0;
}
// read from stdin and replace first newline with null character
void get(char * string, int n){
  fgets(string, n, stdin);

  while (*string != '\0')  {
    if (*string == '\n'){
      *string = '\0';
      break;
    }
    string++;
  }
}

Result

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