[Libguestfs] [nbdkit PATCH] main: More idiomatic use of getopt_long
Eric Blake
eblake at redhat.com
Thu Jun 28 16:36:16 UTC 2018
Prefer named constants over magic numbers in the 'struct option'
list, and expand the list of enums for long-only options so that
the call to getopt_long() can switch directly to every option,
rather than needing a lengthy if/else chain that grows for every
new long option.
Patch best viewed with whitespace changes ignored.
Signed-off-by: Eric Blake <eblake at redhat.com>
---
src/main.c | 191 ++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 100 insertions(+), 91 deletions(-)
diff --git a/src/main.c b/src/main.c
index d2e5674..6be0991 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,5 @@
/* nbdkit
- * Copyright (C) 2013-2017 Red Hat Inc.
+ * Copyright (C) 2013-2018 Red Hat Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -109,44 +109,55 @@ struct backend *backend;
static char *random_fifo_dir = NULL;
static char *random_fifo = NULL;
-enum { HELP_OPTION = CHAR_MAX + 1 };
+enum {
+ HELP_OPTION = CHAR_MAX + 1,
+ DUMP_CONFIG_OPTION,
+ DUMP_PLUGIN_OPTION,
+ EXIT_WITH_PARENT_OPTION,
+ FILTER_OPTION,
+ RUN_OPTION,
+ SELINUX_LABEL_OPTION,
+ TLS_OPTION,
+ TLS_CERTIFICATES_OPTION,
+ TLS_VERIFY_PEER_OPTION,
+};
static const char *short_options = "e:fg:i:nop:P:rst:u:U:vV";
static const struct option long_options[] = {
- { "help", 0, NULL, HELP_OPTION },
- { "dump-config",0, NULL, 0 },
- { "dump-plugin",0, NULL, 0 },
- { "exit-with-parent", 0, NULL, 0 },
- { "export", 1, NULL, 'e' },
- { "export-name",1, NULL, 'e' },
- { "exportname", 1, NULL, 'e' },
- { "filter", 1, NULL, 0 },
- { "foreground", 0, NULL, 'f' },
- { "no-fork", 0, NULL, 'f' },
- { "group", 1, NULL, 'g' },
- { "ip-addr", 1, NULL, 'i' },
- { "ipaddr", 1, NULL, 'i' },
- { "new-style", 0, NULL, 'n' },
- { "newstyle", 0, NULL, 'n' },
- { "old-style", 0, NULL, 'o' },
- { "oldstyle", 0, NULL, 'o' },
- { "pid-file", 1, NULL, 'P' },
- { "pidfile", 1, NULL, 'P' },
- { "port", 1, NULL, 'p' },
- { "read-only", 0, NULL, 'r' },
- { "readonly", 0, NULL, 'r' },
- { "run", 1, NULL, 0 },
- { "selinux-label", 1, NULL, 0 },
- { "single", 0, NULL, 's' },
- { "stdin", 0, NULL, 's' },
- { "threads", 1, NULL, 't' },
- { "tls", 1, NULL, 0 },
- { "tls-certificates", 1, NULL, 0 },
- { "tls-verify-peer", 0, NULL, 0 },
- { "unix", 1, NULL, 'U' },
- { "user", 1, NULL, 'u' },
- { "verbose", 0, NULL, 'v' },
- { "version", 0, NULL, 'V' },
+ { "help", no_argument, NULL, HELP_OPTION },
+ { "dump-config", no_argument, NULL, DUMP_CONFIG_OPTION },
+ { "dump-plugin", no_argument, NULL, DUMP_PLUGIN_OPTION },
+ { "exit-with-parent", no_argument, NULL, EXIT_WITH_PARENT_OPTION },
+ { "export", required_argument, NULL, 'e' },
+ { "export-name", required_argument, NULL, 'e' },
+ { "exportname", required_argument, NULL, 'e' },
+ { "filter", required_argument, NULL, FILTER_OPTION },
+ { "foreground", no_argument, NULL, 'f' },
+ { "no-fork", no_argument, NULL, 'f' },
+ { "group", required_argument, NULL, 'g' },
+ { "ip-addr", required_argument, NULL, 'i' },
+ { "ipaddr", required_argument, NULL, 'i' },
+ { "new-style", no_argument, NULL, 'n' },
+ { "newstyle", no_argument, NULL, 'n' },
+ { "old-style", no_argument, NULL, 'o' },
+ { "oldstyle", no_argument, NULL, 'o' },
+ { "pid-file", required_argument, NULL, 'P' },
+ { "pidfile", required_argument, NULL, 'P' },
+ { "port", required_argument, NULL, 'p' },
+ { "read-only", no_argument, NULL, 'r' },
+ { "readonly", no_argument, NULL, 'r' },
+ { "run", required_argument, NULL, RUN_OPTION },
+ { "selinux-label", required_argument, NULL, SELINUX_LABEL_OPTION },
+ { "single", no_argument, NULL, 's' },
+ { "stdin", no_argument, NULL, 's' },
+ { "threads", required_argument, NULL, 't' },
+ { "tls", required_argument, NULL, TLS_OPTION },
+ { "tls-certificates", required_argument, NULL, TLS_CERTIFICATES_OPTION },
+ { "tls-verify-peer", no_argument, NULL, TLS_VERIFY_PEER_OPTION },
+ { "unix", required_argument, NULL, 'U' },
+ { "user", required_argument, NULL, 'u' },
+ { "verbose", no_argument, NULL, 'v' },
+ { "version", no_argument, NULL, 'V' },
{ NULL },
};
@@ -233,25 +244,27 @@ main (int argc, char *argv[])
break;
switch (c) {
- case 0: /* options which are long only */
- if (strcmp (long_options[option_index].name, "dump-config") == 0) {
- dump_config ();
- exit (EXIT_SUCCESS);
- }
- else if (strcmp (long_options[option_index].name, "dump-plugin") == 0) {
- dump_plugin = 1;
- }
- else if (strcmp (long_options[option_index].name, "exit-with-parent") == 0) {
+ case DUMP_CONFIG_OPTION:
+ dump_config ();
+ exit (EXIT_SUCCESS);
+
+ case DUMP_PLUGIN_OPTION:
+ dump_plugin = 1;
+ break;
+
+ case EXIT_WITH_PARENT_OPTION:
#ifdef PR_SET_PDEATHSIG
- exit_with_parent = 1;
- foreground = 1;
+ exit_with_parent = 1;
+ foreground = 1;
+ break;
#else
- fprintf (stderr, "%s: --exit-with-parent is not implemented for this operating system\n",
- program_name);
- exit (EXIT_FAILURE);
+ fprintf (stderr, "%s: --exit-with-parent is not implemented for this operating system\n",
+ program_name);
+ exit (EXIT_FAILURE);
#endif
- }
- else if (strcmp (long_options[option_index].name, "filter") == 0) {
+
+ case FILTER_OPTION:
+ {
struct filter_filename *t;
t = malloc (sizeof *t);
@@ -263,51 +276,47 @@ main (int argc, char *argv[])
t->filename = optarg;
filter_filenames = t;
}
- else if (strcmp (long_options[option_index].name, "run") == 0) {
- if (socket_activation) {
- fprintf (stderr, "%s: cannot use socket activation with --run flag\n",
- program_name);
- exit (EXIT_FAILURE);
- }
- run = optarg;
- foreground = 1;
- }
- else if (strcmp (long_options[option_index].name, "selinux-label") == 0) {
- selinux_label = optarg;
- break;
- }
- else if (strcmp (long_options[option_index].name, "tls") == 0) {
- tls_set_on_cli = 1;
- if (strcmp (optarg, "off") == 0 || strcmp (optarg, "0") == 0)
- tls = 0;
- else if (strcmp (optarg, "on") == 0 || strcmp (optarg, "1") == 0)
- tls = 1;
- else if (strcmp (optarg, "require") == 0 ||
- strcmp (optarg, "required") == 0 ||
- strcmp (optarg, "force") == 0)
- tls = 2;
- else {
- fprintf (stderr, "%s: --tls flag must be off|on|require\n",
- program_name);
- exit (EXIT_FAILURE);
- }
- break;
- }
- else if (strcmp (long_options[option_index].name, "tls-certificates") == 0) {
- tls_certificates_dir = optarg;
- break;
- }
- else if (strcmp (long_options[option_index].name, "tls-verify-peer") == 0) {
- tls_verify_peer = 1;
- break;
+ break;
+
+ case RUN_OPTION:
+ if (socket_activation) {
+ fprintf (stderr, "%s: cannot use socket activation with --run flag\n",
+ program_name);
+ exit (EXIT_FAILURE);
}
+ run = optarg;
+ foreground = 1;
+ break;
+
+ case SELINUX_LABEL_OPTION:
+ selinux_label = optarg;
+ break;
+
+ case TLS_OPTION:
+ tls_set_on_cli = 1;
+ if (strcmp (optarg, "off") == 0 || strcmp (optarg, "0") == 0)
+ tls = 0;
+ else if (strcmp (optarg, "on") == 0 || strcmp (optarg, "1") == 0)
+ tls = 1;
+ else if (strcmp (optarg, "require") == 0 ||
+ strcmp (optarg, "required") == 0 ||
+ strcmp (optarg, "force") == 0)
+ tls = 2;
else {
- fprintf (stderr, "%s: unknown long option: %s (%d)\n",
- program_name, long_options[option_index].name, option_index);
+ fprintf (stderr, "%s: --tls flag must be off|on|require\n",
+ program_name);
exit (EXIT_FAILURE);
}
break;
+ case TLS_CERTIFICATES_OPTION:
+ tls_certificates_dir = optarg;
+ break;
+
+ case TLS_VERIFY_PEER_OPTION:
+ tls_verify_peer = 1;
+ break;
+
case 'e':
exportname = optarg;
newstyle = 1;
--
2.14.4
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