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authorDavid Sterba <dsterba@suse.com>2017-01-25 16:35:00 +0100
committerDavid Sterba <dsterba@suse.com>2017-03-08 13:00:45 +0100
commita52537a594b8167150ea820700f9d6dff233744e (patch)
tree1398bca59576ad58387b45523134d2fab965f40c /help.c
parent1c880f34f13e51aae9704449603f74680e442cf6 (diff)
btrfs-progs: move help implemetnation to own file
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'help.c')
-rw-r--r--help.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/help.c b/help.c
index 3060059..b571804 100644
--- a/help.c
+++ b/help.c
@@ -18,6 +18,7 @@
#include <stdlib.h>
#include <string.h>
#include <limits.h>
+#include <getopt.h>
#include "commands.h"
#include "utils.h"
@@ -28,6 +29,101 @@
#define USAGE_OPTIONS 4U
#define USAGE_LISTING 8U
+static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
+
+const char *get_argv0_buf(void)
+{
+ return argv0_buf;
+}
+
+void fixup_argv0(char **argv, const char *token)
+{
+ int len = strlen(argv0_buf);
+
+ snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
+ argv[0] = argv0_buf;
+}
+
+void set_argv0(char **argv)
+{
+ strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
+ argv0_buf[sizeof(argv0_buf) - 1] = 0;
+}
+
+int check_argc_exact(int nargs, int expected)
+{
+ if (nargs < expected)
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ if (nargs > expected)
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+
+ return nargs != expected;
+}
+
+int check_argc_min(int nargs, int expected)
+{
+ if (nargs < expected) {
+ fprintf(stderr, "%s: too few arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+int check_argc_max(int nargs, int expected)
+{
+ if (nargs > expected) {
+ fprintf(stderr, "%s: too many arguments\n", argv0_buf);
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+ * Preprocess @argv with getopt_long to reorder options and consume the "--"
+ * option separator.
+ * Unknown short and long options are reported, optionally the @usage is printed
+ * before exit.
+ */
+void clean_args_no_options(int argc, char *argv[], const char * const *usagestr)
+{
+ static const struct option long_options[] = {
+ {NULL, 0, NULL, 0}
+ };
+
+ while (1) {
+ int c = getopt_long(argc, argv, "", long_options, NULL);
+
+ if (c < 0)
+ break;
+
+ switch (c) {
+ default:
+ if (usagestr)
+ usage(usagestr);
+ }
+ }
+}
+
+/*
+ * Same as clean_args_no_options but pass through arguments that could look
+ * like short options. Eg. reisze which takes a negative resize argument like
+ * '-123M' .
+ *
+ * This accepts only two forms:
+ * - "-- option1 option2 ..."
+ * - "option1 option2 ..."
+ */
+void clean_args_no_options_relaxed(int argc, char *argv[], const char * const *usagestr)
+{
+ if (argc <= 1)
+ return;
+
+ if (strcmp(argv[1], "--") == 0)
+ optind = 2;
+}
+
static int do_usage_one_command(const char * const *usagestr,
unsigned int flags, FILE *outf)
{