CODEWITHSUNDEEP
cstring
Mike John
Mike John

Reputation: 818

Extracting a Phrase from a line

I'm looking for a word/phrase in a file.txt.

file looks like this:

    apple tree '\t' data
    apple '\t' data
    apple pie '\t' data
    Greek '\t' data
    Holland ; Netherlands ; The Netherlands '\t' data

I am looking for a char *word inside this huge file. It gets tricky when I have words like Netherlands or The Netherlands and I want to grab that data.

I have broken the problem down into tiny parts. So far I know how many lines the file has and can use that information to fseek to that line. Those parts work independently of this part below.

file_lines = 12325;

// line_index[] every element corresponds to a line in to a line in the file.
char* buffer[256];
FILE fp = fopen(file.txt, "r") 

int i, j, k;
for(i = line_index[index_start]; i < line_index[index_end]; i++)
{
   fseek(fp, i, SEEK_SET);
   fgets(buffer, 256, fp);

   if(strstr(buffer, word) != NULL) // word is here
   {
     // having problems finding the word here

     for(j = 0; j < 256; j++)
       for(k = 0; k < 256; k++)
       {  
         if(buffer[k] == word[k])
          continue;

         if(buffer[k] == ' ')
          continue;

         if(buffer[k] == ';')
          break;

         if(buffer[k] == '\t')
           break;
       }

   }
}

My biggest problem is making sure the word/phrase is in that line. I can know which potential line has an instance of the word, but if I am looking for apple I might get apple tree if I don't search inside that line correctly.

Please help.

Upvotes: 0

Views: 51

Answers (1)

Charlie Burns
Charlie Burns

Reputation: 7044

Roughly...

   char *tab = strchr(buffer, '\t');
   if(tab) *tab = 0;
   if(strstr(buffer, word) != NULL) // word is here
   {
       char *token = strtok(buffer, ";");
       int found = 0;
       while(token) {
          // remove this printf later, but for now it will help you debug
          printf("'%s' vs '%s'\n", word, token); 
          if(strcmp(word, token) == 0) {
              found = 1;
              break;
          }
          token = strtok(0, ";");
       }
       if(found) {
           if(tab == 0) {
              printf("No data for %s\n", word);
           } else {
              printf("data is '%s'\n", tab+1);
           }
       }

Upvotes: 2

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