The environment class provides methods for accessing and manipulating environment variables.
#include <rudiments/environment.h>
#include <rudiments/stdio.h>
int main(int argc, const char **argv) {
// Print the PATH environment variable.
stdoutput.printf("PATH=%s\n\n",environment::getValue("PATH"));
// Set TEST=testvalue and print the TEST.
environment::setValue("TEST","testvalue");
stdoutput.printf("TEST=%s\n\n",environment::getValue("TEST"));
// Remove TEST and print it.
environment::remove("TEST");
stdoutput.printf("TEST=%s\n\n",environment::getValue("TEST"));
// Print all environment variable/value pairs.
stdoutput.write("All Variables:\n");
for (const char * const *v=environment::variables(); v && *v; v++) {
stdoutput.printf("%s\n",*v);
}
stdoutput.write('\n');
// Clear the environment and atttempt to print all
// environment variable/value pairs. Should print nothing.
environment::clear();
stdoutput.write("All Variables (should be empty now):\n");
for (const char * const *v=environment::variables(); v && *v; v++) {
stdoutput.printf("%s\n",*v);
}
stdoutput.write('\n');
}