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/* Miscellaneous utilities.
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>
/* Simple doubly-linked list append routine. This implementation assumes that
each list element contains an embedded ctf_list_t as the first member.
An additional ctf_list_t is used to store the head (l_next) and tail
(l_prev) pointers. The current head and tail list elements have their
previous and next pointers set to NULL, respectively. */
void
ctf_list_append (ctf_list_t *lp, void *newp)
{
ctf_list_t *p = lp->l_prev; /* p = tail list element. */
ctf_list_t *q = newp; /* q = new list element. */
lp->l_prev = q;
q->l_prev = p;
q->l_next = NULL;
if (p != NULL)
p->l_next = q;
else
lp->l_next = q;
}
/* Prepend the specified existing element to the given ctf_list_t. The
existing pointer should be pointing at a struct with embedded ctf_list_t. */
void
ctf_list_prepend (ctf_list_t * lp, void *newp)
{
ctf_list_t *p = newp; /* p = new list element. */
ctf_list_t *q = lp->l_next; /* q = head list element. */
lp->l_next = p;
p->l_prev = NULL;
p->l_next = q;
if (q != NULL)
q->l_prev = p;
else
lp->l_prev = p;
}
/* Delete the specified existing element from the given ctf_list_t. The
existing pointer should be pointing at a struct with embedded ctf_list_t. */
void
ctf_list_delete (ctf_list_t *lp, void *existing)
{
ctf_list_t *p = existing;
if (p->l_prev != NULL)
p->l_prev->l_next = p->l_next;
else
lp->l_next = p->l_next;
if (p->l_next != NULL)
p->l_next->l_prev = p->l_prev;
else
lp->l_prev = p->l_prev;
}
/* Return 1 if the list is empty. */
int
ctf_list_empty_p (ctf_list_t *lp)
{
return (lp->l_next == NULL && lp->l_prev == NULL);
}
/* Convert a 32-bit ELF symbol into Elf64 and return a pointer to it. */
Elf64_Sym *
ctf_sym_to_elf64 (const Elf32_Sym *src, Elf64_Sym *dst)
{
dst->st_name = src->st_name;
dst->st_value = src->st_value;
dst->st_size = src->st_size;
dst->st_info = src->st_info;
dst->st_other = src->st_other;
dst->st_shndx = src->st_shndx;
return dst;
}
/* A string appender working on dynamic strings. Returns NULL on OOM. */
char *
ctf_str_append (char *s, const char *append)
{
size_t s_len = 0;
if (append == NULL)
return s;
if (s != NULL)
s_len = strlen (s);
size_t append_len = strlen (append);
if ((s = realloc (s, s_len + append_len + 1)) == NULL)
return NULL;
memcpy (s + s_len, append, append_len);
s[s_len + append_len] = '\0';
return s;
}
/* A version of ctf_str_append that returns the old string on OOM. */
char *
ctf_str_append_noerr (char *s, const char *append)
{
char *new_s;
new_s = ctf_str_append (s, append);
if (!new_s)
return s;
return new_s;
}
/* A realloc() that fails noisily if called with any ctf_str_num_users. */
void *
ctf_realloc (ctf_file_t *fp, void *ptr, size_t size)
{
if (fp->ctf_str_num_refs > 0)
{
ctf_dprintf ("%p: attempt to realloc() string table with %lu active refs\n",
(void *) fp, (unsigned long) fp->ctf_str_num_refs);
return NULL;
}
return realloc (ptr, size);
}
/* Store the specified error code into errp if it is non-NULL, and then
return NULL for the benefit of the caller. */
void *
ctf_set_open_errno (int *errp, int error)
{
if (errp != NULL)
*errp = error;
return NULL;
}
/* Store the specified error code into the CTF container, and then return
CTF_ERR / -1 for the benefit of the caller. */
unsigned long
ctf_set_errno (ctf_file_t * fp, int err)
{
fp->ctf_errno = err;
return CTF_ERR;
}
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