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/* Labelled ranges of type IDs.
Copyright (C) 2019-2020 Free Software Foundation, Inc.
This file is part of libctf.
libctf is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not see
<http://www.gnu.org/licenses/>. */
#include <ctf-impl.h>
#include <string.h>
static int
extract_label_info (ctf_file_t *fp, const ctf_lblent_t **ctl,
uint32_t *num_labels)
{
const ctf_header_t *h;
h = (const ctf_header_t *) fp->ctf_data.cts_data;
*ctl = (const ctf_lblent_t *) (fp->ctf_buf + h->cth_lbloff);
*num_labels = (h->cth_objtoff - h->cth_lbloff) / sizeof (ctf_lblent_t);
return 0;
}
/* Returns the topmost label, or NULL if any errors are encountered. */
const char *
ctf_label_topmost (ctf_file_t *fp)
{
const ctf_lblent_t *ctlp = NULL;
const char *s;
uint32_t num_labels = 0;
if (extract_label_info (fp, &ctlp, &num_labels) < 0)
return NULL; /* errno is set for us. */
if (num_labels == 0)
{
(void) ctf_set_errno (fp, ECTF_NOLABELDATA);
return NULL;
}
if ((s = ctf_strraw (fp, (ctlp + num_labels - 1)->ctl_label)) == NULL)
(void) ctf_set_errno (fp, ECTF_CORRUPT);
return s;
}
/* Iterate over all labels. We pass the label string and the lblinfo_t struct
to the specified callback function. */
int
ctf_label_iter (ctf_file_t *fp, ctf_label_f *func, void *arg)
{
const ctf_lblent_t *ctlp = NULL;
uint32_t i;
uint32_t num_labels = 0;
ctf_lblinfo_t linfo;
const char *lname;
int rc;
if (extract_label_info (fp, &ctlp, &num_labels) < 0)
return -1; /* errno is set for us. */
if (num_labels == 0)
return (ctf_set_errno (fp, ECTF_NOLABELDATA));
for (i = 0; i < num_labels; i++, ctlp++)
{
if ((lname = ctf_strraw (fp, ctlp->ctl_label)) == NULL)
{
ctf_dprintf ("failed to decode label %u with "
"type %u\n", ctlp->ctl_label, ctlp->ctl_type);
return (ctf_set_errno (fp, ECTF_CORRUPT));
}
linfo.ctb_type = ctlp->ctl_type;
if ((rc = func (lname, &linfo, arg)) != 0)
return rc;
}
return 0;
}
typedef struct linfo_cb_arg
{
const char *lca_name; /* Label we want to retrieve info for. */
ctf_lblinfo_t *lca_info; /* Where to store the info about the label. */
} linfo_cb_arg_t;
static int
label_info_cb (const char *lname, const ctf_lblinfo_t *linfo, void *arg)
{
/* If lname matches the label we are looking for, copy the
lblinfo_t struct for the caller. */
if (strcmp (lname, ((linfo_cb_arg_t *) arg)->lca_name) == 0)
{
/* * Allow caller not to allocate storage to test if label exists. */
if (((linfo_cb_arg_t *) arg)->lca_info != NULL)
memcpy (((linfo_cb_arg_t *) arg)->lca_info, linfo,
sizeof (ctf_lblinfo_t));
return 1; /* Indicate we found a match. */
}
return 0;
}
/* Retrieve information about the label with name "lname". */
int
ctf_label_info (ctf_file_t *fp, const char *lname, ctf_lblinfo_t *linfo)
{
linfo_cb_arg_t cb_arg;
int rc;
cb_arg.lca_name = lname;
cb_arg.lca_info = linfo;
if ((rc = ctf_label_iter (fp, label_info_cb, &cb_arg)) < 0)
return rc;
if (rc != 1)
return (ctf_set_errno (fp, ECTF_NOLABEL));
return 0;
}
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