Add logname util

src/logname.c

@@ -0,0 +1,26 @@
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int usage(char *argv0) {
+  printf("Usage: %s\n", argv0);
+  return 1;
+}
+
+int main(int argc, char *argv[]){
+  int opt;
+  while ((opt = getopt(argc, argv, ":")) != -1) {
+    switch (opt) {
+      case '?':
+        fprintf(stderr, "%s: invalid option -- '%c'\n", argv[0], optopt);
+        return usage(argv[0]);
+    }
+  }
+
+  if (getlogin() != NULL) {
+    printf("%s\n", getlogin());
+  } else {
+    perror(argv[0]);
+  }
+  return errno;
+}

src/tee.c

@@ -0,0 +1,50 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+int usage(char *argv0) {
+  printf("Usage: %s [-ai] [file ...]\n", argv0);
+  return 2;
+}
+
+int main(int argc, char *argv[]){
+  int opt;
+  bool append = false;
+  bool iflag = false;
+  while ((opt = getopt(argc, argv, ":ai")) != -1) {
+    switch (opt) {
+      case 'a':
+        append = true;
+        break;
+      case 'i':
+        iflag = true;
+        break;
+      case '?':
+        fprintf(stderr, "%s: invalid option -- '%c'\n", argv[0], optopt);
+        return usage(argv[0]);
+    }
+  }
+
+  if (iflag && signal(SIGINT, SIG_IGN) == SIG_ERR) {} // FIXME
+
+  int arg = optind;
+  void *buf[BUFSIZ];
+  FILE *file;
+  ssize_t n;
+
+  while ((n = read(0, buf, sizeof(buf))) > 0) {
+    optind = arg;
+    if (optind < argc) {
+      for (; optind < argc; optind++) {
+        file = fopen(argv[optind], append ? "w" : "a+");
+        fwrite(buf, BUFSIZ, 1, file);
+        fclose(file);
+        append = true;
+      }
+    } else {
+      fwrite(buf, BUFSIZ, 1, stdout);
+    }
+  }
+  return 0;
+}