counting duplicates from one file to another not correct on larger files
The program takes two txt files as arguments, the text file to be searched and the the text file containing the string to search for. We aren't allowed to use any string library functions. For some reason it works just fine on smaller text files for example:
textFileToSearch.txt:
Quote:
this is fun
is this fun
fish
patternToSearchFor.txt:
returns:
which is correct.
but if I use a much larger file like this:
Quote:
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The quick brown fox jumps over the lazy dog.The quick brown fox jumps over the lazy dog.
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and search for , it returns:
when I'm pretty sure there are only 18 "er"s in that file.
I can't figure out why it doesn't work on bigger files. Any help would much appreciate.
(I know the Lines and Columns part isn't correct either, I'm more worried about the counting part right now)
Code:
#include<stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
int patternFileLength(FILE *pattern){
int len = 0;
int chr;
while((chr = fgetc(pattern)) != EOF){
if(chr != '\0'){
len++;
}
}
return len;
}
int charcmp( char a, char b, int type ){
if ( a == b ){
type = 1;
return 1;
}
else if(a == b || a - 32 == b || a + 32 == b){
type = 2;
return 1;
}
else if((a >= 48 && a <= 57) && (b >= 48 && b <= 57)){
type = 3;
return 1;
}
else{
return 0;
}
}
int main(int argc, char *argv[])
{
FILE *textFile;
FILE *patternFile;
char x,y;
int type = 0, match = 0, count = 0;
int line = 1, col = -3;
textFile = fopen(argv[1], "r");
patternFile = fopen(argv[2], "r");
int length = patternFileLength(patternFile);
rewind(patternFile);
y = fgetc(patternFile);
while((x = fgetc(textFile)) != EOF){
if(charcmp(x, y, type) == 1){
y = fgetc(patternFile);
match++;
if(match == length){
count++;
match = 0;
printf("LINE: %d COL: %d\n", line, col);
}
}
else{
rewind(patternFile);
y = fgetc(patternFile);
}
if(x == '\n' || x == '\0'){
line++;
col = -3;
}
col++;
}
printf("\nMatches: %d\n", count);
fclose(textFile);
fclose(patternFile);
return 0;
}
