unaam

1 files changed, 84 insertions, 0 deletions

diff --git a/src/unaam.c b/src/unaam.c
new file mode 100644
index 0000000..7a4a853
--- /dev/null
+++ b/src/unaam.c
@@ -0,0 +1,84 @@
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/utsname.h>
+
+#include "io/read_file.h"
+#include "util/option.h"
+
+static const char *usage_string =
+  "Gebruik: %s [OPTIES]...\n"
+  "\n"
+  "Toon systeem informatie\n"
+  "\n"
+  "  -a    Toon alle informatie\n"
+  "  -s    Toon kernnaam\n"
+  "  -n    Toon netwerk knooppunt gastheernaam\n"
+  "  -r    Toon kernuitgave\n"
+  "  -v    Toon kernversie\n"
+  "  -m    Toon machine harde-goederen-naam\n"
+  "  -h    Toon deze hulptekst\n"
+  "  -V    Toon versienummer\n";
+
+struct options {
+  bool print_all;
+
+  bool print_sysname;
+  bool print_nodename;
+  bool print_release;
+  bool print_version;
+  bool print_machine;
+};
+
+static void parse_options(int argc, char **argv, struct options *opts) {
+  const struct option_spec spec[] = {
+    {'a', OPTION_SETBOOL(&opts->print_all)},
+
+    {'s', OPTION_SETBOOL(&opts->print_sysname)},
+    {'n', OPTION_SETBOOL(&opts->print_nodename)},
+    {'r', OPTION_SETBOOL(&opts->print_release)},
+    {'v', OPTION_SETBOOL(&opts->print_version)},
+    {'m', OPTION_SETBOOL(&opts->print_machine)},
+
+    {'h', OPTION_HELPUSAGE(usage_string)},
+    {'V', OPTION_VERSION()},
+    OPTION_SPEC_END
+  };
+
+  option_parse(argc, argv, spec);
+}
+
+int entry_unaam(int argc, char **argv) {
+  struct options opts = {0};
+  parse_options(argc, argv, &opts);
+
+  if (opts.print_all == false &&
+    opts.print_sysname == false &&
+    opts.print_nodename == false &&
+    opts.print_release == false &&
+    opts.print_version == false &&
+    opts.print_machine == false) {
+    opts.print_sysname = true;
+  }
+
+  struct utsname name;
+  uname(&name); // can't fail
+
+  bool first = true;
+
+#define PRINT(typ) \
+  if (opts.print_all || opts.print_ ## typ) { \
+    printf("%s%s", first ? "" : " ", name.typ); \
+    first = false; \
+  }
+
+  PRINT(sysname);
+  PRINT(nodename);
+  PRINT(release);
+  PRINT(version);
+  PRINT(machine);
+  printf("\n");
+
+  return 0;
+}