strstr problem...

[Sebastiani]

Hi, I am trying to write some structure searching functions. My main difficulty is my lack of knowledge on how to access these structures correctly, but for now here's my problem:

I am trying to use strstr() to search for a specific word in the struct, but it fails to find even single characters I KNOW are there.

?????????????????????????????????????????????????

void search(void)
 {
char buf[1000];
   
FILE *fpr;
  
char check[100];
  
char *found;

printf("\nPlease enter a word to search for an instance of:");

fgets(check,100,stdin);

if((fpr=fopen("c:/MyFolder/Data.txt","r"))==NULL)
{printf("Couldn't Open \"c:/MyFolder/Data.txt\" ! \n");exit(1);}

fgets(buf,1000-1,fpr);

found=strstr(buf,check);

if(found)
printf("Found!");

else { printf("Not found!!!!!!!!!!!!!!!!!");}

fclose(fpr);
 } 

??????????????????????????????????????????????

The output is always "Not found!!!!!!!!!!!!!!!!"

Any Ideas?

[ggs]

Doesn't strstr return a pointer to a dynamically allocated copy of the original? I guess not... educational post.

[ggs]

http://www.newton.cam.ac.uk/computer/c_ref/C/EXAMPLES/

[mix0matt]

I don't know much about the C style I/O, but my guess was that fgets was reading the '\n' (read from stdin) character into your check string. I performed the following test which removed the '\n' from the "check" string, and it worked.

void search(void)
{
   char buf[1000];
   char input[100];
   char *check;
   char *found;
   FILE *fpr;

   printf("\nPlease enter a word to search for an instance of:");
   fgets (input,100,stdin);
   check = strtok( input, "\n" );

   if ((fpr=fopen("Data.txt","r"))==NULL){
       printf("Couldn't Open \"c:/MyFolder/Data.txt\" ! \n");
       exit(1);
   }

   fgets (buf,1000-1,fpr);
   printf( "%s\n%s\n", buf, check);

   found = strstr(buf,check);
   printf( "%s", found );

   if (found)
      printf("Found!");
   else {
      printf("Not found!!!!!!!!!!!!!!!!!");
   }

   fclose(fpr);
}

like i said, i'm unfamiliar with C's input functions, but i would guess there's one that would ignore the '\n' from the user's input...

mxr

[Unregistered]

Instead of having it simply say "Not Found", have it output the string to sdtout and see if it is finding what it should.

[Unregistered]

Hi Sebastini
mix0matt is right ........
the problem with that program is the fgets function.
Remember fgets reads only till the first "\n"(from any stream) . So if ur file is having newline character then it wont read what u wanted.

After reading dump the file content to the screen and check ...
happy coding
Raghu R

[Sebastiani]

Yup. I started programming in June or July of that year, so that really was a noob post.

>> Certainly Salem telling me to not reply to posts that are over 7 years old will bring a tear to my eye..... But it was worth sharing.

Probably.