util.h

   1 /*
   2  * util.c - useful functions header
   3  *
   4  * Copyright © 2007 Julien Danjou <julien@danjou.info>
   5  * Copyright © 2006 Pierre Habouzit <madcoder@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #ifndef AWESOME_MEM_H
  24 #define AWESOME_MEM_H
  25
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include "config.h"
  29
  30 #define ssizeof(foo)            (ssize_t)sizeof(foo)
  31 #define countof(foo)            (ssizeof(foo) / ssizeof(foo[0]))
  32
  33 #define p_new(type, count)      ((type *)xmalloc(sizeof(type) * (count)))
  34 #define p_clear(p, count)       ((void)memset((p), 0, sizeof(*(p)) * (count)))
  35 #define p_realloc(pp, count)    xrealloc((void*)(pp) sizeof(**(pp) * (count)))
  36 #define p_dup(p, count)         xmemdup((p), sizeof(*(p)) * (count))
  37
  38 #ifdef __GNUC__
  39
  40 #define p_delete(mem_pp)                           \
  41     do {                                           \
  42         typeof(**(mem_pp)) **__ptr = (mem_pp);     \
  43         free(*__ptr);                              \
  44         *__ptr = NULL;                             \
  45     } while(0)
  46
  47 #else
  48
  49 #define p_delete(mem_p)                            \
  50     do {                                           \
  51         void *__ptr = (mem_p);                     \
  52         free(*__ptr);                              \
  53         *(void **)__ptr = NULL;                    \
  54     } while (0)
  55
  56 #endif
  57
  58 static inline void * __attribute__ ((malloc)) xmalloc(ssize_t size)
  59 {
  60     void *ptr;
  61
  62     if(size <= 0)
  63         return NULL;
  64
  65     ptr = calloc(1, size);
  66
  67     if(!ptr)
  68         abort();
  69
  70     return ptr;
  71 }
  72
  73 static inline void
  74 xrealloc(void **ptr, ssize_t newsize)
  75 {
  76     if(newsize <= 0)
  77         p_delete(ptr);
  78     else
  79     {
  80         *ptr = realloc(*ptr, newsize);
  81         if(!*ptr)
  82             abort();
  83     }
  84 }
  85
  86 static inline void *xmemdup(const void *src, ssize_t size)
  87 {
  88     return memcpy(xmalloc(size), src, size);
  89 }
  90
  91 /** \brief \c NULL resistant strlen.
  92  *
  93  * Unlinke it's libc sibling, a_strlen returns a ssize_t, and supports its
  94  * argument beeing NULL.
  95  *
  96  * \param[in] s the string.
  97  * \return the string length (or 0 if \c s is \c NULL).
  98  */
  99 static inline ssize_t a_strlen(const char *s)
 100 {
 101     return s ? strlen(s) : 0;
 102 }
 103
 104
 105 /** \brief \c NULL resistant strdup.
 106  *
 107  * the a_strdup() function returns a pointer to a new string, which is a
 108  * duplicate of \c s. Memory should be freed using p_delete().
 109  *
 110  * \warning when s is \c "", it returns NULL !
 111  *
 112  * \param[in] s the string to duplicate.
 113  * \return a pointer to the duplicated string.
 114  */
 115 static inline char *a_strdup(const char *s)
 116 {
 117     ssize_t len = a_strlen(s);
 118     return len ? p_dup(s, len + 1) : NULL;
 119 }
 120
 121 void eprint(const char *, ...) __attribute__ ((noreturn)) __attribute__ ((format(printf, 1, 2)));
 122 void uicb_spawn(Display *, DC *, awesome_config *, const char *);
 123 Bool xgettextprop(Display *, Window, Atom, char *, unsigned int);
 124 double compute_new_value_from_arg(const char *, double);
 125
 126 #endif