Add --version and --help.

Author: skeeto

config.h

@@ -3,6 +3,10 @@
 
 /* Compile-time configuration */
 
+#ifndef ENCHIVE_VERSION
+#  define ENCHIVE_VERSION 1.0
+#endif
+
 #ifndef ENCHIVE_RANDOM_DEVICE
 #  define ENCHIVE_RANDOM_DEVICE /dev/urandom
 #endif

src/docs.h

@@ -4,8 +4,11 @@ static const char *docs_usage[] = {
 "              [-a|--agent[=seconds]] [--no-agent]",
 #endif
 #if ENCHIVE_OPTION_RANDOM_DEVICE
-"              [--random-device <file>]",
+"              [--random-device <file>] "
+#else
+"              "
 #endif
+"[--version] [--help]",
 "              <command> [args]",
 "",
 "Commands (unique prefixes accepted):",
@@ -24,6 +27,8 @@ static const char *docs_usage[] = {
 #endif
 "  --pubkey <file>, -p    set the public key file [~/.enchive.pub]",
 "  --seckey <file>, -s    set the secret key file [~/.enchive.sec]",
+"  --version              display version information",
+"  --help                 display this usage information",
 "",
 "Enchive archives files by encrypting them to yourself using your",
 "public key. It uses ChaCha20, Curve25519, and SHA-224.",

src/enchive.c

@@ -1126,6 +1126,12 @@ print_usage(FILE *f)
     multiputs(docs_usage, f);
 }
 
+static void
+print_version(void)
+{
+    puts("enchive " STR(ENCHIVE_VERSION));
+}
+
 int
 main(int argc, char **argv)
 {
@@ -1139,6 +1145,8 @@ main(int argc, char **argv)
 #endif
         {"pubkey",        'p', OPTPARSE_REQUIRED},
         {"seckey",        's', OPTPARSE_REQUIRED},
+        {"version",       'V', OPTPARSE_NONE},
+        {"help",          'h', OPTPARSE_NONE},
         {0, 0, 0}
     };
 
@@ -1178,6 +1186,14 @@ main(int argc, char **argv)
             case 's':
                 global_seckey = options->optarg;
                 break;
+            case 'h':
+                print_usage(stdout);
+                exit(EXIT_SUCCESS);
+                break;
+            case 'V':
+                print_version();
+                exit(EXIT_SUCCESS);
+                break;
             default:
                 fatal("%s", options->errmsg);
         }

src/sha256.c

@@ -1,7 +1,7 @@
 /*********************************************************************
 * Filename:   sha256.c
 * Author:     Brad Conte (brad AT bradconte.com)
-* Copyright:
+* Copyright:  Public Domain
 * Disclaimer: This code is presented "as is" without any guarantees.
 * Details:    Implementation of the SHA-256 hashing algorithm.
               SHA-256 is one of the three algorithms in the SHA2

src/sha256.h

@@ -1,7 +1,7 @@
 /*********************************************************************
 * Filename:   sha256.h
 * Author:     Brad Conte (brad AT bradconte.com)
-* Copyright:
+* Copyright:  Public Domain
 * Disclaimer: This code is presented "as is" without any guarantees.
 * Details:    Defines the API for the corresponding SHA1 implementation.
 *********************************************************************/