Question

need this in c programming and you can edit the code below. also give me screenshot of the output

Exercise 1. (50 points) mygrep. grep is a very useful tool that searches for a string pattern in files. In this exercise, we implement mygrep, a simplified version of grep. mygrep takes two arguments, argv[1] and argv[2], from the command line. argv[1] is a string pattern and argv[2] is a filename. The program prints all the lines in the file specified by argv[2] that have argv[1] as a substring, mygrep does not support regular expressions. The main task of this exercise is to complete the print_matched_lines() function in the starter code. It has the following prototype. int print_matched_lines (const char *s, const char *filename); The function opens the file specified by filename, reads lines from the file (using fgets()), and for each line, prints the line to the standard output if (and only if they contain the string s. The function calls strstr() to determine if a string appears in another string. We can assume the lines have at most 1022 ASCII characters before the new line. mygrep should behave the same as grep if the pattern does not contain special characters used in regular expressions. If there are punctuation marks, the first argument (the pattern) needs to be enclosed by single quotation marks, as in the second command in the sample sessions listed below. $ ./mygrep mygrep Makefile TARGETS=mygrep data-extract data-gen $ ./mygrep 'main' mygrep.c int main(int argc, char **argv)

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

#define LINE_SIZE 1024

void my_error(char *s)
{
fprintf(stderr, "Error: %s\n", s);
perror("errno");
exit(-1);
}

// This funciton prints lines (in a file) that contain string s.
// assume all lines has at most (LINE_SIZE - 2) ASCII characters.
//
// Functions that may be called in this function:
// fopen(), fclose(), fgets(), fputs(), strstr()
//
// Paramters:
// s: the string
// filename: the file to be searched
// Return values:
// 0: success.
// EOF: cannot open or close file.
int print_matched_lines(const char *s, const char *filename)
{
// TODO
return 0;
}

int main(int argc, char **argv)
{
if (argc != 3) {
fprintf(stderr, "Usage: %s <string> <filename>\n", argv[0]);
return -1;
}

// print_matched_lines() to print any lines in file argv[2] that contains arg[1]

if (print_matched_lines(argv[1], argv[2])) {
my_error("print_matched_lines() retunred a non_zero value.");
}
return 0;
}

Answer 1

// This funciton prints lines (in a file) that contain string s.
// assume all lines has at most (LINE_SIZE - 2) ASCII characters.
//
// Functions that may be called in this function:
// fopen(), fclose(), fgets(), fputs(), strstr()
//
// Paramters:
// s: the string
// filename: the file to be searched
// Return values:
// 0: success.
// EOF: cannot open or close file.
int print_matched_lines(const char *s, const char *filename)
{
        FILE *fp;
        char str[60];

        fp = fopen(filename, "r");
        if(fp == NULL) {
          return EOF;
        }
        
        char line[LINE_SIZE];
        
        while (fgets(line, sizeof(line), fp)) {
                
                if(strstr(line, s) != NULL) {
                        printf("%s", line);
                }
                
        }
        
        return 0;
}

**************************************************

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