Reputation: 1300
I am looking for a way to determine if a certain file contains a certain string. It can be a system call or a C function, it doesn't matter.
I tried with grep, but it doesnt return anything
//name is the directory entry name
char grepcmd[150];
strcpy(grepcmd,"grep -c hello ");
strcat(grepcmd, name);
int status = system(grepcmd);
Upvotes: 0
Views: 156
Reputation: 1243
You are doing well. status
should be zero if your given file with name name
contains hello
string. Otherwise it should be nonzero value.
Upvotes: 2
Reputation: 37938
If you're up for system calls, then just mmap()
the file and call something like strnstr()
. (You won't be able to call the real strnstr()
since it will stop at any \0
in your file, so you'll have to write your own.)
Upvotes: 1