awesome/util.h

126 lines
3.4 KiB
C

/*
* util.c - useful functions header
*
* Copyright © 2007 Julien Danjou <julien@danjou.info>
* Copyright © 2006 Pierre Habouzit <madcoder@debian.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.
*
*/
#ifndef AWESOME_MEM_H
#define AWESOME_MEM_H
#include <string.h>
#include <stdlib.h>
#include "config.h"
#define ssizeof(foo) (ssize_t)sizeof(foo)
#define countof(foo) (ssizeof(foo) / ssizeof(foo[0]))
#define p_new(type, count) ((type *)xmalloc(sizeof(type) * (count)))
#define p_clear(p, count) ((void)memset((p), 0, sizeof(*(p)) * (count)))
#define p_realloc(pp, count) xrealloc((void*)(pp) sizeof(**(pp) * (count)))
#define p_dup(p, count) xmemdup((p), sizeof(*(p)) * (count))
#ifdef __GNUC__
#define p_delete(mem_pp) \
do { \
typeof(**(mem_pp)) **__ptr = (mem_pp); \
free(*__ptr); \
*__ptr = NULL; \
} while(0)
#else
#define p_delete(mem_p) \
do { \
void *__ptr = (mem_p); \
free(*__ptr); \
*(void **)__ptr = NULL; \
} while (0)
#endif
static inline void * __attribute__ ((malloc)) xmalloc(ssize_t size)
{
void *ptr;
if(size <= 0)
return NULL;
ptr = calloc(1, size);
if(!ptr)
abort();
return ptr;
}
static inline void
xrealloc(void **ptr, ssize_t newsize)
{
if(newsize <= 0)
p_delete(ptr);
else
{
*ptr = realloc(*ptr, newsize);
if(!*ptr)
abort();
}
}
void eprint(const char *, ...) __attribute__ ((noreturn)) __attribute__ ((format(printf, 1, 2)));
void spawn(Display *, awesome_config *, const char *);
static inline void *xmemdup(const void *src, ssize_t size)
{
return memcpy(xmalloc(size), src, size);
}
/** \brief \c NULL resistant strlen.
*
* Unlinke it's libc sibling, a_strlen returns a ssize_t, and supports its
* argument beeing NULL.
*
* \param[in] s the string.
* \return the string length (or 0 if \c s is \c NULL).
*/
static inline ssize_t a_strlen(const char *s)
{
return s ? strlen(s) : 0;
}
/** \brief \c NULL resistant strdup.
*
* the a_strdup() function returns a pointer to a new string, which is a
* duplicate of \c s. Memory should be freed using p_delete().
*
* \warning when s is \c "", it returns NULL !
*
* \param[in] s the string to duplicate.
* \return a pointer to the duplicated string.
*/
static inline char *a_strdup(const char *s)
{
ssize_t len = a_strlen(s);
return len ? p_dup(s, len + 1) : NULL;
}
#endif