如何在Linux中使用C编程检查我的php和pear版本？

Question

If possible, I don't want to use string detection method where you use string functions to detect the version in a given string output. If it isn't possible then please disregard what I just typed.

Is there a function to do it like uname() or do I have to write my own function? If so, please give me a headstart or you can make my life easier by teaching me how to do it. Thanks!

Btw, I'm using dreamhost shared server if that might help and yes, it has gcc, php5.3 and pear 1.9.4 installed.

Answer 1

Sorry to disappoint, but that is what you will need to do. The popen function is your friend. Simply call "pear -V" in read mode with popen and store the information in a buffer that you can easily parse to isolate the version numbers for both pear and PHP. It can be done much cleaner, but the gist of it is:

FILE *pfd;
char buffer[1024];
char *bp = buffer;
char tmp[100];
size_t len;
size_t line = 0;

if ((pfd = popen ("pear -V", "r")) == NULL) {
    fprintf (stderr, "error: failed to open pipe.");
    return 1;
}

while (fgets (tmp, 1023, pfd) != NULL && line < 2)
{
    len = strlen (tmp);
    strncpy (bp, tmp, len);
    bp += len;
    line++;
}

pclose (pfd);

printf ("
buffer:

%s

", buffer);

Output:

buffer:

PEAR Version: 1.9.4
PHP Version: 5.3.8

The parsing of the version numbers is left for you.