1 files changed, 174 insertions, 0 deletions

diff --git a/tools/perf/util/parse-options.h b/tools/perf/util/parse-options.h
new file mode 100644
index 000000000000..a1039a6ce0eb
--- /dev/null
+++ b/tools/perf/util/parse-options.h
@@ -0,0 +1,174 @@
+#ifndef PARSE_OPTIONS_H
+#define PARSE_OPTIONS_H
+
+enum parse_opt_type {
+        /* special types */
+        OPTION_END,
+        OPTION_ARGUMENT,
+        OPTION_GROUP,
+        /* options with no arguments */
+        OPTION_BIT,
+        OPTION_BOOLEAN, /* _INCR would have been a better name */
+        OPTION_SET_INT,
+        OPTION_SET_PTR,
+        /* options with arguments (usually) */
+        OPTION_STRING,
+        OPTION_INTEGER,
+        OPTION_LONG,
+        OPTION_CALLBACK,
+};
+
+enum parse_opt_flags {
+        PARSE_OPT_KEEP_DASHDASH = 1,
+        PARSE_OPT_STOP_AT_NON_OPTION = 2,
+        PARSE_OPT_KEEP_ARGV0 = 4,
+        PARSE_OPT_KEEP_UNKNOWN = 8,
+        PARSE_OPT_NO_INTERNAL_HELP = 16,
+};
+
+enum parse_opt_option_flags {
+        PARSE_OPT_OPTARG  = 1,
+        PARSE_OPT_NOARG   = 2,
+        PARSE_OPT_NONEG   = 4,
+        PARSE_OPT_HIDDEN  = 8,
+        PARSE_OPT_LASTARG_DEFAULT = 16,
+};
+
+struct option;
+typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
+
+/*
+ * `type`::
+ *   holds the type of the option, you must have an OPTION_END last in your
+ *   array.
+ *
+ * `short_name`::
+ *   the character to use as a short option name, '\0' if none.
+ *
+ * `long_name`::
+ *   the long option name, without the leading dashes, NULL if none.
+ *
+ * `value`::
+ *   stores pointers to the values to be filled.
+ *
+ * `argh`::
+ *   token to explain the kind of argument this option wants. Keep it
+ *   homogenous across the repository.
+ *
+ * `help`::
+ *   the short help associated to what the option does.
+ *   Must never be NULL (except for OPTION_END).
+ *   OPTION_GROUP uses this pointer to store the group header.
+ *
+ * `flags`::
+ *   mask of parse_opt_option_flags.
+ *   PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
+ *   PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
+ *   PARSE_OPT_NONEG: says that this option cannot be negated
+ *   PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in
+ *                    the long one.
+ *
+ * `callback`::
+ *   pointer to the callback to use for OPTION_CALLBACK.
+ *
+ * `defval`::
+ *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
+ *   OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
+ *   the value when met.
+ *   CALLBACKS can use it like they want.
+ */
+struct option {
+        enum parse_opt_type type;
+        int short_name;
+        const char *long_name;
+        void *value;
+        const char *argh;
+        const char *help;
+
+        int flags;
+        parse_opt_cb *callback;
+        intptr_t defval;
+};
+
+#define OPT_END()                   { OPTION_END }
+#define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) }
+#define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
+#define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
+#define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
+#define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
+#define OPT_SET_PTR(s, l, v, h, p)  { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
+#define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
+#define OPT_LONG(s, l, v, h)        { OPTION_LONG, (s), (l), (v), NULL, (h) }
+#define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
+#define OPT_DATE(s, l, v, h) \
+        { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \
+          parse_opt_approxidate_cb }
+#define OPT_CALLBACK(s, l, v, a, h, f) \
+        { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
+
+/* parse_options() will filter out the processed options and leave the
+ * non-option argments in argv[].
+ * Returns the number of arguments left in argv[].
+ */
+extern int parse_options(int argc, const char **argv,
+                         const struct option *options,
+                         const char * const usagestr[], int flags);
+
+extern NORETURN void usage_with_options(const char * const *usagestr,
+                                        const struct option *options);
+
+/*----- incremantal advanced APIs -----*/
+
+enum {
+        PARSE_OPT_HELP = -1,
+        PARSE_OPT_DONE,
+        PARSE_OPT_UNKNOWN,
+};
+
+/*
+ * It's okay for the caller to consume argv/argc in the usual way.
+ * Other fields of that structure are private to parse-options and should not
+ * be modified in any way.
+ */
+struct parse_opt_ctx_t {
+        const char **argv;
+        const char **out;
+        int argc, cpidx;
+        const char *opt;
+        int flags;
+};
+
+extern int parse_options_usage(const char * const *usagestr,
+                               const struct option *opts);
+
+extern void parse_options_start(struct parse_opt_ctx_t *ctx,
+                                int argc, const char **argv, int flags);
+
+extern int parse_options_step(struct parse_opt_ctx_t *ctx,
+                              const struct option *options,
+                              const char * const usagestr[]);
+
+extern int parse_options_end(struct parse_opt_ctx_t *ctx);
+
+
+/*----- some often used options -----*/
+extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
+extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
+extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
+
+#define OPT__VERBOSE(var)  OPT_BOOLEAN('v', "verbose", (var), "be verbose")
+#define OPT__QUIET(var)    OPT_BOOLEAN('q', "quiet",   (var), "be quiet")
+#define OPT__VERBOSITY(var) \
+        { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \
+          PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
+        { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \
+          PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
+#define OPT__DRY_RUN(var)  OPT_BOOLEAN('n', "dry-run", (var), "dry run")
+#define OPT__ABBREV(var)  \
+        { OPTION_CALLBACK, 0, "abbrev", (var), "n", \
+          "use <n> digits to display SHA-1s", \
+          PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
+
+extern const char *parse_options_fix_filename(const char *prefix, const char *file);
+
+#endif