1// SPDX-License-Identifier: GPL-2.0
 2#include "perf.h"
 3#include "util/util.h"
 4#include "util/debug.h"
 5#include <subcmd/parse-options.h>
 6#include "util/parse-regs-options.h"
 7
 8int
 9parse_regs(const struct option *opt, const char *str, int unset)
10{
11	uint64_t *mode = (uint64_t *)opt->value;
12	const struct sample_reg *r;
13	char *s, *os = NULL, *p;
14	int ret = -1;
15
16	if (unset)
17		return 0;
18
19	/*
20	 * cannot set it twice
21	 */
22	if (*mode)
23		return -1;
24
25	/* str may be NULL in case no arg is passed to -I */
26	if (str) {
27		/* because str is read-only */
28		s = os = strdup(str);
29		if (!s)
30			return -1;
31
32		for (;;) {
33			p = strchr(s, ',');
34			if (p)
35				*p = '\0';
36
37			if (!strcmp(s, "?")) {
38				fprintf(stderr, "available registers: ");
39				for (r = sample_reg_masks; r->name; r++) {
40					fprintf(stderr, "%s ", r->name);
41				}
42				fputc('\n', stderr);
43				/* just printing available regs */
44				return -1;
45			}
46			for (r = sample_reg_masks; r->name; r++) {
47				if (!strcasecmp(s, r->name))
48					break;
49			}
50			if (!r->name) {
51				ui__warning("unknown register %s,"
52					    " check man page\n", s);
53				goto error;
54			}
55
56			*mode |= r->mask;
57
58			if (!p)
59				break;
60
61			s = p + 1;
62		}
63	}
64	ret = 0;
65
66	/* default to all possible regs */
67	if (*mode == 0)
68		*mode = PERF_REGS_MASK;
69error:
70	free(os);
71	return ret;
72}