int main(int argc, char *argv[ ]) {
//recieving all arguments (options and/or input files)
int c;
int printMsg = 0; //option m : 0- don;t print, 1- printBytes
int revDiff = 0; // option r: 0- regular, 2- apply difference by reverse
FILE *toPrint; //input file: original file to fix
FILE *difference; //input file: differences file, as recieved by bcmp.c
while ((c = getopt(argc, argv, "hrm")) != -1) {
switch(c) {
case 'h':
printf("\r\n=====options summery:======\r\n");
printf("-h print a summary of options and exit\r\n");
printf("-r reverse the differences\r\n");
printf("-m print a message each time a change is applied\r\n");
printf("====================\r\n");
return 0;
case 'r':
revDiff = 1;
break;
case 'm':
printMsg = 1;
break;
}
}
// parsing input file into tokens (newLine delimeter)
char diffLine[300];
difference = fopen(argv[optind+1], "r");
struct diff theDiff;
while(fgets(diffLine,sizeof(diffLine),difference) != NULL)
{
// get difference (per line)
parsediff(diffLine, &theDiff);
// open input file again
toPrint = fopen(argv[optind], "rb+");
// read bytes from file (stream) - 4 bytes per iteration, and XOR it with results (accumelator)
fseek(toPrint,theDiff.offset, SEEK_SET);
// in case no reverse
if ( revDiff == 0 ) {
if ( (char)getc(toPrint) == theDiff.old ) {
fseek(toPrint,theDiff.offset,SEEK_SET);
fwrite(&theDiff.new,1,1,toPrint);
if (printMsg == 1) {printf("A change was applied: %s\n",diffLine);}
}
}
// in case reverse was needed
else{
if ( (char)getc(toPrint) == theDiff.new ) {
void fix(FILE *file1, char *line, int print){
struct diff diff;
parsediff(line, &diff);
fseek(file1, diff.offset-1, SEEK_SET);
fwrite(&diff.new , 1, 1, file1);
if(print) {
printf("A change has been applied\n");
}
}
void fixChange( char *diffLine, struct diff theDiff, FILE *toPrint, char* flgs){
// get difference (per line)
parsediff(diffLine, &theDiff);
// read bytes from file (stream) - 4 bytes per iteration, and XOR it with results (accumelator)
fseek(toPrint,theDiff.offset, SEEK_SET);
// in case no reverse
if ( (strchr(flgs, 'r')) == 0 ) {
if ( (char)getc(toPrint) == theDiff.old ) {
fseek(toPrint,theDiff.offset,SEEK_SET);
fwrite(&theDiff.new,1,1,toPrint);
if (strchr(flgs, 'm')) {printf("A change was applied: %s\n",diffLine);}
}
}
int main (int argc, char **argv) {
char v=0,help=0,r=0;
char c;
char flag=0;
while ( (c=getopt(argc,argv,"hrm")) != -1 ) {
switch (c) {
case 'h':
helper();
return;
case 'r':
r=1;
break;
case 'm':
v=1;
break;
}
}
FILE *input,*diffFile;
if (!(input = fopen(argv[optind],"r+"))) {
printf("bad input file name\n");
return;
}
if (!(diffFile = fopen(argv[optind+1],"r"))) {
printf("bad diff file name\n");
return;
}
char line[128];
struct diff current;
while ( fgets(line,128,diffFile) ) {
printf("read diff line: %s\n",line);
parsediff(line,¤t);
fseek(input,current.offset,SEEK_SET);
char value[1];
printf("new: %i old: %i \n", current.new, current.old);
if (r==1) {
fputc(-current.new,input);
}
else
int main(int argc, char *argv[] )
{
int hflag=0, mflag=0, rflag=0, optflag;
while((optflag=getopt(argc,argv, "hrm"))!=-1)
{
switch(optarg) //NOTICE /////////////////////////////////////////////////////////
{
case 'h':
break;
case 'r':
case 'r':
default:
printf("unknown flag, -h for help");
}
}
/*
while (getopt (,,)!= -1)
if r - rflag=1
h - hlag=1
m - mflag=1
? = do nothing \ dont care
*/
if (argc > 2)
//flags input here.
/*
#include <unistd.h>
int getopt(int argc, char * const argv[],
const char *optstring);
OPTIONS
-h print a summary of options and exit
-r reverse the differences
-m print a message each time a change is applied
*/
{
FILE *f1, *f2;
f1 = fopen(argv[1],"r+"); // f1 = fopen(argv[optind],"r+");
f2 = fopen(argv[2],"r"); // f2 = fopen(argv[optind+1],"r");
struct diff diff;
long i=0;
while (!(feof(f2)))
{
char line[512]="",x[16]="";
fgets(line,512,f2);
// printf("this is the line:fgets %s - strlen %d\n",line, strlen(line) );
if(strlen(line) > 10)
{
parsediff( line, &diff); //throws segmentation fault on an empty/small (under 7 chars) string!
// printf("diff.old = %d, diff.new= %d, diff.offset= %ld\n",diff.old,diff.new,diff.offset);
/* used fseek instead
while(i!= (diff.offset) )
{
i++;
fread(&x, 1, 1,f1);
// printf(" -%c i'm in da loop\n",*x); //test fread is working. it is.
//fgetc(f1);
}
*/
fseek(f1,diff.offset,SEEK_SET);
//if (rflag) tmp = diff.new ,diff.new = old ,diff.old =tmp; //NOTICE
//if (mflag) printf("change has been applied to the file");
fwrite(&diff.new,1,1,f1);
}
else
{
int main(int argc, char **argv) {
FILE *changes;
FILE *tochange;
struct diff diff;
char line[128];
char ch[1]={'a'};
int message = 0;
char c;
int reverse=0;
int pid;
int count = 0;
int status;
while (1) {
c = getopt (argc, argv, "rmh");
if (c == -1) {
break;
}
switch (c) {
case 'r':
printf ("User has invoked with -r.\n");
reverse = 1;
break;
case 'h':
printf ("OPTIONS\n -h print a summary of options and exit\n -r reverse the differences\n -m print a message each time a change is applied\n");
break;
case 'm':
printf ("User has invoked with -m.\n");
message = 1;
break;
case '?':
default:
printf ("Usage: %s [-a] [-b <something>].\n", argv[0]);
break;
}
}
if(argc != optind+2)
printf("illigel input\n%d %d",argc,optind);
else{
tochange = fopen(argv[optind], "rb+");
changes = fopen(argv[optind+1], "r");
while ( fgets ( line, 128, changes ) != NULL )
{
parsediff(line, &diff);
fseek(tochange, diff.offset, SEEK_SET );
ch[0] = (char)getc(tochange);
if (!reverse){
if (ch[0] == diff.old){
count++;
pid = fork();
if(pid == 0){
printf("%d\n",count);
fixme(tochange,diff);
exit(0);
}
}
}
}
fclose(tochange);
fclose(changes);
}
if (pid != 0){
while (count > 0){
wait(&status);
printf("exit with status %ld\n",(long)status);
count--;
}
}
return 0;
}
int main(int argc, char **argv) {
struct diff diff;
fputdiff(stdout, parsediff("byte 33 -174 +230", &diff));
return 0;
}