Output file to screen

CMakeLists.txt

@@ -35,6 +35,7 @@ add_executable (ls examples/ls.c)
 add_executable (locate examples/locate.c)
 add_executable (updatedb examples/updatedb.c)
 add_executable (scandir examples/scandir.c)
+add_executable (cat examples/cat.c)
 
 # Build test programs
 include (CTest)

examples/cat.c

@@ -0,0 +1,85 @@
+/*
+ * Output contents of a file.
+ *
+ * Compile this file with Visual Studio and run the produced command in
+ * console with a file name argument.  For example, command
+ *
+ *     cat include\dirent.h
+ *
+ * will output the dirent.h to screen.
+ *
+ * Copyright (C) 1998-2019 Toni Ronkko
+ * This file is part of dirent.  Dirent may be freely distributed
+ * under the MIT license.  For all details and documentation, see
+ * https://github.com/tronkko/dirent
+ */
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+#include <locale.h>
+
+static void output_file (const char *fn);
+
+
+int
+main(
+    int argc, char *argv[])
+{
+    int i;
+
+    /* Select default locale */
+    setlocale (LC_ALL, "");
+
+    /* Require at least one file */
+    if (argc == 1) {
+        fprintf (stderr, "Usage: cat filename\n");
+        return EXIT_FAILURE;
+    }
+
+    /* For each file name argument in command line */
+    i = 1;
+    while (i < argc) {
+        output_file (argv[i]);
+        i++;
+    }
+    return EXIT_SUCCESS;
+}
+
+/*
+ * Output file to screen
+ */
+static void
+output_file(
+    const char *fn)
+{
+    FILE *fp;
+
+    /* Open file */
+    fp = fopen (fn, "r");
+    if (fp != NULL) {
+        size_t n;
+        char buffer[4096];
+
+        /* Output file to screen */
+        do {
+
+            /* Read some bytes from file */
+            n = fread (buffer, 1, 4096, fp);
+
+            /* Output bytes to screen */
+            fwrite (buffer, 1, n, stdout);
+
+        } while (n != 0);
+
+        /* Close file */
+        fclose (fp);
+
+    } else {
+        /* Could not open directory */
+        fprintf (stderr, "Cannot open %s (%s)\n", fn, strerror (errno));
+        exit (EXIT_FAILURE);
+    }
+}