// SPDX-License-Identifier: GPL-2.0
#include "tracepoint.h"

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <unistd.h>

#include <api/fs/tracing_path.h>
#include "fncache.h"

int tp_event_has_id(const char *dir_path, struct dirent *evt_dir)
{
        char evt_path[MAXPATHLEN];
        int fd;

        snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path, evt_dir->d_name);
        fd = open(evt_path, O_RDONLY);
        if (fd < 0)
                return -EINVAL;
        close(fd);

        return 0;
}

/*
 * Check whether event is in <debugfs_mount_point>/tracing/events
 */
bool is_valid_tracepoint(const char *event_string)
{
        char *dst, *path = malloc(strlen(event_string) + 4); /* Space for "/id\0". */
        bool have_file = false; /* Conservatively return false if memory allocation failed. */
        const char *src;

        if (!path)
                return false;

        /* Copy event_string replacing the ':' with '/'. */
        for (src = event_string, dst = path; *src; src++, dst++)
                *dst = (*src == ':') ? '/' : *src;
        /* Add "/id\0". */
        memcpy(dst, "/id", 4);

        dst = get_events_file(path);
        if (dst)
                have_file = file_available(dst);
        free(dst);
        free(path);
        return have_file;
}