parse-regs-options.c

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// SPDX-License-Identifier: GPL-2.0
#include "perf.h"
#include "util/util.h"
#include "util/debug.h"
#include <subcmd/parse-options.h>
#include "util/parse-regs-options.h"

int
parse_regs(const struct option *opt, const char *str, int unset)
{
    uint64_t *mode = (uint64_t *)opt->value;
    const struct sample_reg *r;
    char *s, *os = NULL, *p;
    int ret = -1;

    if (unset)
        return 0;

    /*
     * cannot set it twice
     */
    if (*mode)
        return -1;

    /* str may be NULL in case no arg is passed to -I */
    if (str) {
        /* because str is read-only */
        s = os = strdup(str);
        if (!s)
            return -1;

        for (;;) {
            p = strchr(s, ',');
            if (p)
                *p = '\0';

            if (!strcmp(s, "?")) {
                fprintf(stderr, "available registers: ");
                for (r = sample_reg_masks; r->name; r++) {
                    fprintf(stderr, "%s ", r->name);
                }
                fputc('\n', stderr);
                /* just printing available regs */
                return -1;
            }
            for (r = sample_reg_masks; r->name; r++) {
                if (!strcasecmp(s, r->name))
                    break;
            }
            if (!r->name) {
                ui__warning("unknown register %s,"
                        " check man page\n", s);
                goto error;
            }

            *mode |= r->mask;

            if (!p)
                break;

            s = p + 1;
        }
    }
    ret = 0;

    /* default to all possible regs */
    if (*mode == 0)
        *mode = PERF_REGS_MASK;
error:
    free(os);
    return ret;
}