Rename C source file to C++ source files

1 files changed, 266 insertions, 0 deletions

diff --git a/src/options.cpp b/src/options.cpp
new file mode 100644
index 0000000..e2fcfdb
--- /dev/null
+++ b/src/options.cpp
@@ -0,0 +1,266 @@
+/* Copyright 2019 Ján Sučan <jan@jansucan.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "options.h"
+
+#include "print.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+/* This header file is automatically generated at build time from the Makefile
+ */
+#include "program_info.h"
+
+#define OPTIONS_MAX_OPERATION_NAME_LENGTH 8
+#define OPTIONS_DEFAULT_SECTOR_SIZE 512
+#define OPTIONS_DEFAULT_BUFFER_SIZE (4 * 1024 * 1024)
+
+struct common_options {
+    bool help;
+    uint32_t sector_size;
+    uint32_t buffer_size;
+};
+
+static int options_parse_unsigned(const char *const arg, uint32_t *const value);
+static void options_parse_operation(const char *const argv,
+                                    options_t *const opts);
+static bool options_parse_common(int *const argc, char ***const argv,
+                                 struct common_options *const opts);
+static bool options_parse_backup(int *const argc, char ***const argv,
+                                 options_t *const opts);
+static bool options_parse_restore(int *const argc, char ***const argv,
+                                  options_t *const opts);
+
+bool
+options_parse(int argc, char **argv, options_t *const opts)
+{
+    // Skip the executable name
+    --argc;
+    ++argv;
+
+    options_parse_operation(argv[0], opts);
+
+    if (options_is_operation(opts, OPERATION_ID_UNKNOWN)) {
+        return false;
+    }
+
+    if (options_is_operation(opts, OPERATION_ID_BACKUP)) {
+        if (!options_parse_backup(&argc, &argv, opts)) {
+            return false;
+        }
+    } else if (options_is_operation(opts, OPERATION_ID_RESTORE)) {
+        if (!options_parse_restore(&argc, &argv, opts)) {
+            return false;
+        }
+    }
+    return true;
+}
+
+void
+options_usage(int exit_code)
+{
+    printf("Usage: %s [-s SECTOR_SIZE] [-b BUFFER_SIZE] [INFILE] REFFILE "
+           "OUTFILE\n",
+           PROGRAM_NAME_STR);
+    exit(exit_code);
+}
+
+bool
+options_is_operation(const options_t *const opts, operation_id_t operation_id)
+{
+    return (opts->operation_id == operation_id);
+}
+
+const options_backup_t *
+options_get_for_backup(const options_t *const opts)
+{
+    return &(opts->op.backup);
+}
+
+const options_restore_t *
+options_get_for_restore(const options_t *const opts)
+{
+    return &(opts->op.restore);
+}
+
+static int
+options_parse_unsigned(const char *const arg, uint32_t *const value)
+{
+    char *end;
+
+    errno = 0;
+
+    *value = strtoul(arg, &end, 0);
+
+    return ((*end != '\0') || (errno != 0)) ? -1 : 0;
+}
+
+static void
+options_parse_operation(const char *const op_name, options_t *const opts)
+{
+    if (op_name == NULL) {
+        opts->operation_id = OPERATION_ID_UNKNOWN;
+    } else if (strncmp(op_name, "help", OPTIONS_MAX_OPERATION_NAME_LENGTH) ==
+               0) {
+        opts->operation_id = OPERATION_ID_HELP;
+    } else if (strncmp(op_name, "backup", OPTIONS_MAX_OPERATION_NAME_LENGTH) ==
+               0) {
+        opts->operation_id = OPERATION_ID_BACKUP;
+    } else if (strncmp(op_name, "restore", OPTIONS_MAX_OPERATION_NAME_LENGTH) ==
+               0) {
+        opts->operation_id = OPERATION_ID_RESTORE;
+    } else {
+        opts->operation_id = OPERATION_ID_UNKNOWN;
+    }
+}
+
+static void
+options_init_common(struct common_options *const opts)
+{
+    opts->help = false;
+    opts->sector_size = OPTIONS_DEFAULT_SECTOR_SIZE;
+    opts->buffer_size = OPTIONS_DEFAULT_BUFFER_SIZE;
+}
+
+static bool
+options_parse_common(int *const argc, char ***const argv,
+                     struct common_options *const opts)
+{
+    int ch;
+    char *arg_sector_size = NULL;
+    char *arg_buffer_size = NULL;
+
+    while ((ch = getopt(*argc, *argv, ":b:hs:")) != -1) {
+        switch (ch) {
+        case 'b':
+            arg_buffer_size = optarg;
+            break;
+
+        case 'h':
+            opts->help = true;
+            break;
+
+        case 's':
+            arg_sector_size = optarg;
+            break;
+
+        case ':':
+            print_error("missing argument for option '-%c'", optopt);
+            return false;
+        default:
+            print_error("unknown option '-%c'", optopt);
+            return false;
+        }
+    }
+
+    *argc -= optind;
+    *argv += optind;
+
+    /* Convert numbers in the arguments */
+    if ((arg_sector_size != NULL) &&
+        options_parse_unsigned(arg_sector_size, &(opts->sector_size))) {
+        print_error("incorrect sector size");
+        return false;
+    } else if ((arg_buffer_size != NULL) &&
+               options_parse_unsigned(arg_buffer_size, &(opts->buffer_size))) {
+        print_error("incorrect buffer size");
+        return false;
+    } else if (opts->sector_size == 0) {
+        print_error("sector size cannot be 0");
+        return false;
+    } else if (opts->buffer_size == 0) {
+        print_error("buffer size cannot be 0");
+        return false;
+    } else if (opts->sector_size > opts->buffer_size) {
+        print_error("sector size cannot larger than buffer size");
+        return false;
+    } else if ((opts->buffer_size % opts->sector_size) != 0) {
+        print_error("buffer size is not multiple of sector size");
+        return false;
+    }
+
+    return true;
+}
+
+static bool
+options_parse_backup(int *const argc, char ***const argv, options_t *const opts)
+{
+    struct common_options common_opts;
+    options_init_common(&common_opts);
+    if (!options_parse_common(argc, argv, &common_opts)) {
+        return false;
+    }
+
+    if (common_opts.help) {
+        opts->operation_id = OPERATION_ID_HELP;
+    } else if (*argc < 3) {
+        print_error("missing arguments");
+        return false;
+    } else if (*argc > 3) {
+        print_error("too many arguments");
+        return false;
+    } else {
+        opts->op.backup.sector_size = common_opts.sector_size;
+        opts->op.backup.buffer_size = common_opts.buffer_size;
+        opts->op.backup.in_file_path = (*argv)[0];
+        opts->op.backup.ref_file_path = (*argv)[1];
+        opts->op.backup.out_file_path = (*argv)[2];
+    }
+
+    return true;
+}
+
+static bool
+options_parse_restore(int *const argc, char ***const argv,
+                      options_t *const opts)
+{
+    struct common_options common_opts;
+    options_init_common(&common_opts);
+    if (!options_parse_common(argc, argv, &common_opts)) {
+        return false;
+    }
+
+    if (common_opts.help) {
+        opts->operation_id = OPERATION_ID_HELP;
+    } else if (*argc < 2) {
+        print_error("missing arguments");
+        return false;
+    } else if (*argc > 2) {
+        print_error("too many arguments");
+        return false;
+    } else {
+        opts->op.restore.sector_size = common_opts.sector_size;
+        opts->op.restore.buffer_size = common_opts.buffer_size;
+        opts->op.restore.in_file_path = (*argv)[0];
+        opts->op.restore.out_file_path = (*argv)[1];
+    }
+
+    return true;
+}