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#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#include <unistd.h>
#define BUF_SIZE 1024
 
 
int options(char* buf, char* optBuf,int linecount, int* flags )
{
  if(flags[0]) {
    if (strcmp(buf,"\n")!=0) {
      sprintf(optBuf,"%s %d", buf,linecount);
		  return linecount++;
	  }
	  sprintf(optBuf,"%s", buf);
  } else if(flags[1]) {
		sprintf(optBuf,"%s %d", buf,linecount);
		return linecount++;
	}
	sprintf(optBuf,"%s", buf);
	return linecount;
}
 
 
int copypaste(char* fileName, int linecount,  int* flags)
{
	static char buf[BUF_SIZE];
	static char optBuf[2*BUF_SIZE];
	FILE* f;
	if (strcmp(fileName,"-") == 0) {
	   f = stdin;
	} else {
		if((f=fopen(fileName,'r'))== NULL) {
			perror("Can't open the file\n");
			return linecount;
		}
	}
	while (fgets(f, buf, BUF_SIZE)!=NULL) {
		linecount = options(buf, optBuf,linecount, flags);
		if (fputs(stdout,optBuf) == EOF) {
			perror("Error while writing\n");
			break;
		}
	}
	if (ferror(f)) {
  }
		perror("Error while reading\n");
	if (f!=0) {
		if (close(f) == -1)
		{
			perror("Can't close the file\n");
		}
	}
	return linecount;
}
 
int main(int argc, char** argv)
{
	int i;
	int linecount = 1;
	int flags[2];
  char opt;
  flags[0] = 0;
  flags[1] = 0;
  while ((opt = getopt(argc,argv,"bn"))!=-1) {
    switch (opt) {
      case 'b': flags[0] = 1; break;
      case 'n': flags[1] = 1; break;
      default: perror("Wrong option\n"); return -1; break;
    }
  }
	if(optind > argc) {
		linecount = copypaste("-", linecount, flags);
	} else {
		for(i = optind; i<argc;i++) {
			linecount = copypaste(argv[i], linecount, flags);
		}
	}
	return 0;
}
 

prog.c: In function ‘copypaste’:
prog.c:33:24: warning: passing argument 2 of ‘fopen’ makes pointer from integer without a cast [-Wint-conversion]
   if((f=fopen(fileName,'r'))== NULL) {
                        ^~~
In file included from prog.c:1:0:
/usr/include/stdio.h:274:14: note: expected ‘const char * restrict’ but argument is of type ‘int’
 extern FILE *fopen (const char *__restrict __filename,
              ^~~~~
prog.c:38:15: warning: passing argument 1 of ‘fgets’ from incompatible pointer type [-Wincompatible-pointer-types]
  while (fgets(f, buf, BUF_SIZE)!=NULL) {
               ^
In file included from prog.c:1:0:
/usr/include/stdio.h:624:14: note: expected ‘char * restrict’ but argument is of type ‘FILE * {aka struct _IO_FILE *}’
 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
              ^~~~~
prog.c:38:18: warning: passing argument 2 of ‘fgets’ makes integer from pointer without a cast [-Wint-conversion]
  while (fgets(f, buf, BUF_SIZE)!=NULL) {
                  ^~~
In file included from prog.c:1:0:
/usr/include/stdio.h:624:14: note: expected ‘int’ but argument is of type ‘char *’
 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
              ^~~~~
prog.c:5:18: warning: passing argument 3 of ‘fgets’ makes pointer from integer without a cast [-Wint-conversion]
 #define BUF_SIZE 1024
                  ^
prog.c:38:23: note: in expansion of macro ‘BUF_SIZE’
  while (fgets(f, buf, BUF_SIZE)!=NULL) {
                       ^~~~~~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:624:14: note: expected ‘FILE * restrict {aka struct _IO_FILE * restrict}’ but argument is of type ‘int’
 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
              ^~~~~
prog.c:40:13: warning: passing argument 1 of ‘fputs’ from incompatible pointer type [-Wincompatible-pointer-types]
   if (fputs(stdout,optBuf) == EOF) {
             ^~~~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:691:12: note: expected ‘const char * restrict’ but argument is of type ‘struct _IO_FILE *’
 extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
            ^~~~~
prog.c:40:20: warning: passing argument 2 of ‘fputs’ from incompatible pointer type [-Wincompatible-pointer-types]
   if (fputs(stdout,optBuf) == EOF) {
                    ^~~~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:691:12: note: expected ‘FILE * restrict {aka struct _IO_FILE * restrict}’ but argument is of type ‘char *’
 extern int fputs (const char *__restrict __s, FILE *__restrict __stream);
            ^~~~~
prog.c:49:13: warning: passing argument 1 of ‘close’ makes integer from pointer without a cast [-Wint-conversion]
   if (close(f) == -1)
             ^
In file included from prog.c:4:0:
/usr/include/unistd.h:356:12: note: expected ‘int’ but argument is of type ‘FILE * {aka struct _IO_FILE *}’
 extern int close (int __fd);
            ^~~~~
prog.c: In function ‘main’:
prog.c:65:17: warning: implicit declaration of function ‘getopt’ [-Wimplicit-function-declaration]
   while ((opt = getopt(argc,argv,"bn"))!=-1) {
                 ^~~~~~
prog.c:72:5: error: ‘optind’ undeclared (first use in this function)
  if(optind > argc) {
     ^~~~~~
prog.c:72:5: note: each undeclared identifier is reported only once for each function it appears in

Standard output is empty