Question

Modify

When executing on the command line having only this program name, the program will accept keyboard input and display such until the user does control+break to exit the program.

The new code should within only this case situation

“if (argc == 1){ /* no args; copy standard input */”

Replace line #20 “filecopy(stdin, stdout);” with your new code.

Open read a text file “7NoInputFileResponse.txt” that contains a message “There were no arguments on the command line to be tested for file open.”

Append to the program to output to the text log file a new line starting with day time date followed by the message "SUCCESSFUL". See example 7-8MiscFunctionsTime on Blackboard.

Append that message to a file “7Error_Log_File.txt” . ?newline

Remember to be using fprintf; stderr; return; and exit statements. Test for file existence, test 7NoInputFileResponse.txt file not null (if null use alternate text string “99 error unknown ” from within the program), existence of 7Error_Log_File.txt otherwise display such message using fprintf stderr and exit.

#include <stdio.h>
#include <stdlib.h> /*needed for stderr and exit */
/* cat: concatenate files, version 2 */

/* filecopy: copy file ifp to file ofp */
void filecopy(FILE *ifp, FILE *ofp) /* pointer to input file, output file */
{
   int c;
   while ((c = getc(ifp)) != EOF)
      putc(c, ofp);
}

int main(int argc, char *argv[])
{
   FILE *fp;
   void filecopy(FILE *, FILE *);
   char *prog = argv[0];  /* this program exe name as source of an error */
   
   if (argc == 1){ /* no args; copy standard input */
      filecopy(stdin, stdout);  /* keyboard_input is repeated as display_output, ctrl_break to exit */
   }
   else
      while (--argc > 0)
         if (( fp = fopen(*++argv, "r")) == NULL) { /* pointer to next command line file */
            fprintf(stderr, "%s: can not open %s\n", prog, *argv);
            exit(1);  /* determined by programmer return value for error type #1 */
         } else {
            filecopy(fp, stdout);
            fclose (fp);
         }
         
   if(ferror(stdout)) {
      fprintf(stderr, "%s: error writing stdout\n", prog);
      exit(2);  /* determined by programmer return value for error type #2 */
   }
   
   exit(0);  /* determined by programmer return value for error type #0, success */
}

Answer 1

Answer:-

//main.c

#pragma once

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

void filecopy(FILE *ifp, FILE *ofp)
{
int c;
while ((c = getc(ifp)) != EOF)
putc(c, ofp);
}

char* getDay(int d)
{
switch (d)
{
case 0: return "Sunday ";
break;
case 1: return "Monday ";
break;
case 2: return "Tuesday ";
break;
case 3: return "Wednesday ";
break;
case 4: return "Thursday ";
break;
case 5: return "Friday ";
break;
case 6: return "Saturday ";
break;
default:
break;
}
}

int main(int argc, char *argv[])
{
FILE *fp;
void filecopy(FILE *, FILE *);
char *prog = argv[0];
if (argc == 1)
{
FILE *infile = fopen("7NoInputFileResponse.txt", "r");
char error_message[100] = "99 error unknown";
FILE *outfile = fopen("7Error_Log_File.txt", "a");
if (infile == NULL)
{
if (outfile != NULL)
{
fprintf(outfile, error_message);
fprintf(outfile, "\n");
exit(0);
}
}
if (outfile == NULL)
{
fprintf(stderr, error_message);
exit(0);
}

filecopy(infile, outfile);
fprintf(outfile, "\n");
time_t t = time(NULL);
struct tm tm = *localtime(&t);
  
fprintf(outfile, getDay(tm.tm_wday));
fprintf(outfile, "%d-%d-%d %d:%d:%d", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
fprintf(outfile, " SUCCESSFUL");
  
fclose(infile);
fclose(outfile);
}

else
while (--argc > 0)
if ((fp = fopen(*++argv, "r")) == NULL)
{
fprintf(stderr, "%s: can not open %s\n", prog, *argv);
exit(1);
}
else
{
filecopy(fp, stdout);
fclose(fp);
}

if (ferror(stdout))
{
fprintf(stderr, "%s: error writing stdout\n", prog);
exit(2);
}
  
exit(0);
  
}

//Output:-

7Error_Log_File.txt - Notepad File Edit Format View Help There were no arguments on the command line to be tested for file op