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/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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 2 of the License, 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "Alloc.hxx"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
gcc_noreturn
static void
oom()
{
(void)write(STDERR_FILENO, "Out of memory\n", 14);
_exit(1);
}
void *
xalloc(size_t size)
{
void *p = malloc(size);
if (gcc_unlikely(p == nullptr))
oom();
return p;
}
void *
xmemdup(const void *s, size_t size)
{
void *p = xalloc(size);
memcpy(p, s, size);
return p;
}
char *
xstrdup(const char *s)
{
char *p = strdup(s);
if (gcc_unlikely(p == nullptr))
oom();
return p;
}
char *
xstrndup(const char *s, size_t n)
{
#ifdef WIN32
char *p = (char *)xalloc(n + 1);
memcpy(p, s, n);
p[n] = 0;
#else
char *p = strndup(s, n);
if (gcc_unlikely(p == nullptr))
oom();
#endif
return p;
}
#if CLANG_OR_GCC_VERSION(4,7)
template<typename... Args>
static inline size_t
FillLengths(size_t *lengths, const char *a, Args&&... args)
{
return FillLengths(lengths, a) + FillLengths(lengths + 1, args...);
}
template<>
inline size_t
FillLengths(size_t *lengths, const char *a)
{
return *lengths = strlen(a);
}
template<typename... Args>
static inline void
StringCat(char *p, const size_t *lengths, const char *a, Args&&... args)
{
StringCat(p, lengths, a);
StringCat(p + *lengths, lengths + 1, args...);
}
template<>
inline void
StringCat(char *p, const size_t *lengths, const char *a)
{
memcpy(p, a, *lengths);
}
#endif
template<typename... Args>
gcc_malloc gcc_nonnull_all
static inline char *
t_xstrcatdup(Args&&... args)
{
#if CLANG_OR_GCC_VERSION(4,7)
constexpr size_t n = sizeof...(args);
size_t lengths[n];
const size_t total = FillLengths(lengths, args...);
char *p = (char *)xalloc(total + 1);
StringCat(p, lengths, args...);
p[total] = 0;
return p;
#else
/* fallback implementation for gcc 4.6, because that old
compiler is too buggy to compile the above template
functions */
const char *const argv[] = { args... };
size_t total = 0;
for (auto i : argv)
total += strlen(i);
char *p = (char *)xalloc(total + 1), *q = p;
for (auto i : argv)
q = stpcpy(q, i);
return p;
#endif
}
char *
xstrcatdup(const char *a, const char *b)
{
return t_xstrcatdup(a, b);
}
char *
xstrcatdup(const char *a, const char *b, const char *c)
{
return t_xstrcatdup(a, b, c);
}
char *
xstrcatdup(const char *a, const char *b, const char *c, const char *d)
{
return t_xstrcatdup(a, b, c, d);
}
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