1 files changed, 48 insertions, 0 deletions
diff --git a/src/packages.c b/src/packages.c
new file mode 100644
index 0000000..835aac4
--- /dev/null
+++ b/src/packages.c
@@ -0,0 +1,48 @@
+#include "packages.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+const char *run_package_command(const char *command) {
+  char buf[64];
+  char *out = NULL;
+  size_t outsize = 0;
+
+  FILE *p = popen(command, "r");
+  if (!p) {
+    fprintf(stderr, "パッケージコマンドを実効に失敗: %s", command);
+    return NULL;
+  }
+
+  while (fgets(buf, sizeof(buf), p) != NULL) {
+    buf[strcspn(buf, "\n")] = '\0';
+
+    size_t len = strlen(buf);
+    char *nout = realloc(out, outsize + len + 1);
+    if (nout == NULL) {
+      perror("メモリの役割に失敗");
+      free(out);
+      pclose(p);
+      return NULL;
+    }
+
+    out = nout;
+
+    memccpy(out + outsize, buf, sizeof(buf), len);
+    outsize += len;
+    out[outsize] = '\0';
+  }
+
+  pclose(p);
+
+  return out;
+}
+
+void display_packages() {
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+  printf("%s (pkg_info)", run_package_command("pkg_info -a | wc -l | sed \"s/ //g\""));
+#elif defined(__FreeBSD__) || defined(__DragonFly__)
+  printf("%s (pkg)", run_package_command("pkg info -a | wc -l | sed \"s/ //g\""));
+#endif
+}