Getting the OS version in Mac OS X using standard C

Question

I\'m trying to get the version of Mac OS X programmatically in C. After searching for a while I tried this code:

#include 

        

Answer 1

Here is one with "less work", good enough for home projects (statically allocated buffers, ignoring errors). Works for me in OS X 10.11.1.

#include 

/*!
  @brief    Returns one component of the OS version
  @param    component  1=major, 2=minor, 3=bugfix
 */
int GetOSVersionComponent(int component) {
    char cmd[64] ;
    sprintf(
            cmd,
            "sw_vers -productVersion | awk -F '.' '{print $%d}'",
            component
    ) ;
    FILE* stdoutFile = popen(cmd, "r") ;

    int answer = 0 ;
    if (stdoutFile) {
        char buff[16] ;
        char *stdout = fgets(buff, sizeof(buff), stdoutFile) ;
        pclose(stdoutFile) ;
        sscanf(stdout, "%d", &answer) ;
    }

    return answer ;
}

int main(int argc, const char * argv[]) {
    printf(
           "Your OS version is: %d.%d.%d\n",
           GetOSVersionComponent(1),
           GetOSVersionComponent(2),
           GetOSVersionComponent(3)
           ) ;

    return 0 ;
}