c - printing the checksum of a txt file without printing the file path -


i want compute checksum of txt file using c in mac, wrote simple program 

#include <iostream> #include <stdio.h> using namespace std;  int main() {     file *in;     char buff[512];     if(!(in = popen("shasum ritesh_file_test.txt", "r")))     {         return 1;     }     while(fgets(buff, sizeof(buff), in)!=null)     {         cout << buff;     }      printf ("checksum = %s",buff);     pclose(in);     return 0;

it prints checksum of txt file , prints path of file. as

30b574b4ddbc681d9e5e6492ae82b32a7923e02e ritesh_file_test.txt

how rid of path , access checksum value?

the output format of shasum of form

 <hash> <filename>

so, hash value , file name separated space. 1 possible way, separate hash complete outpuy, tokenize buff before printing.

you can make use of strtok() , use space () delimiter take out checksum value.

that said, in c, don't include #include <iostream>, don't use using namespace std; , don't write cout. moreover, use c compiler compile c code.


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