1 files changed, 63 insertions, 0 deletions
diff --git a/src/spons.c b/src/spons.c
new file mode 100644
index 0000000..3dcebbc
--- /dev/null
+++ b/src/spons.c
@@ -0,0 +1,63 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "util/versie.h"
+#include "io/read_file.h"
+
+static void usage(FILE *f) {
+  fprintf(f,
+      "Gebruik: spons [-hV] [BESTAND]\n"
+      "\n"
+      "Zuig standaard invoer op en schrijf naar BESTAND.\n"
+      "\n"
+      "  -a    Voeg de invoer aan het einde van BESTAND toe, schrijf BESTAND niet over\n"
+      "  -h    Toon deze hulptekst\n"
+      "  -V    Toon versienummer\n");
+}
+
+// Returns pointer to argument array containing the output file name
+static char** parse_options(int argc, char **argv, bool *a) {
+  int opt;
+  while ((opt = getopt(argc, argv, "ahV")) != -1) {
+    switch (opt) {
+      case 'a':
+        *a = true;
+        break;
+
+      case 'h':
+        usage(stdout);
+        exit(0);
+
+      case 'V':
+        drukkedoos_print_versie(stdout, "spons");
+        exit(0);
+
+      case '?':
+        usage(stderr);
+        exit(1);
+    }
+  }
+
+  return argv + optind;
+}
+
+int entry_spons(int argc, char **argv) {
+  bool a = false;
+  char **args = parse_options(argc, argv, &a);
+
+  FILE *file = stdout;
+  if (*args != NULL) {
+    file = fopen(*args, a ? "a" : "w");
+  }
+
+  struct filebuf *fb = stream_to_filebuf(stdin, O_NOALLOWMAP);
+  fwrite(fb->buf, 1, fb->sz, file);
+  fclose(file);
+
+  free_filebuf(fb);
+
+  return 0;
+}