Removed submodules

p1-sh/utils/cut.c

@@ -0,0 +1,75 @@
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+// You may assume that lines are no longer than 1024 bytes
+#define LINELEN 1024
+
+static void usage (void);
+
+int
+main (int argc, char *argv[])
+{
+  int opt;
+  char *delimitter = " ";
+  long field = 1;
+
+  while ((opt = getopt (argc, argv, "d:f:")) != -1)
+    {
+      switch (opt)
+        {
+        case 'd':
+          delimitter = optarg;
+          break;
+        case 'f':
+          field = strtol (optarg, NULL, 10);
+          break;
+        default:
+          printf ("./bin/cut: invalid option -- \'%c\'\n", optopt);
+          exit (EXIT_FAILURE);
+        }
+    }
+
+  if (field < 1)
+    {
+      usage ();
+      exit (EXIT_FAILURE);
+    }
+
+  FILE *file = optind < argc ? fopen (argv[optind], "r") : stdin;
+  if (file == NULL)
+    {
+      perror ("Failed to open input file");
+      exit (EXIT_FAILURE);
+    }
+
+  char buffer[LINELEN];
+
+  while (fgets (buffer, sizeof (buffer), file) != NULL)
+    {
+      buffer[strcspn (buffer, "\n")] = '\0';
+
+      char *token = strtok (buffer, delimitter);
+      long i = 1;
+      while (i++ < field) token = strtok (NULL, delimitter);
+
+      printf("%s\n", token != NULL ? token : "");
+    }
+
+  return EXIT_SUCCESS;
+}
+
+static void
+usage (void)
+{
+  printf ("cut, splits each line based on a delimiter\n");
+  printf ("usage: cut [FLAG] FILE\n");
+  printf ("FLAG can be:\n");
+  printf (
+      "  -d C     split each line based on the character C (default ' ')\n");
+  printf ("  -f N     print the Nth field (1 is first, default 1)\n");
+  printf ("If no FILE specified, read from STDIN\n");
+}