util.h

   1 /*
   2  * (c) 2010 Cyrill Gorcunov, gorcunov@gmail.com
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or (at
   7  * your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  */
  19
  20 #ifndef UTIL_H
  21 #define UTIL_H
  22
  23 #include <stdarg.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27
  28 /*
  29  * Some bits are stolen from perf tool and Linux kernel :)
  30  */
  31
  32 #ifdef __GNUC__
  33 #define NORETURN __attribute__((__noreturn__))
  34 #else
  35 #define NORETURN
  36 #ifndef __attribute__
  37 #define __attribute__(x)
  38 #endif
  39 #endif
  40
  41 #define __stringify_1(x)        #x
  42 #define __stringify(x)          __stringify_1(x)
  43
  44 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  45 extern void die_perror(const char *s) NORETURN;
  46 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  47 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
  48 extern void debug(const char *err, ...) __attribute__((format (printf, 1, 2)));
  49 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  50
  51 #define BUG() DIE_IF(1)
  52 #define DIE_IF(cnd)                                                     \
  53 do {                                                                    \
  54         if (cnd)                                                        \
  55                 die(" at (" __FILE__ ":" __stringify(__LINE__) "): "    \
  56                 __stringify(cnd) "\n");                                 \
  57 } while (0)
  58
  59 extern size_t strlcat(char *dest, const char *src, size_t count);
  60
  61 /*
  62  * Handy macros
  63  */
  64 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  65
  66 static inline void *xzalloc(unsigned long size)
  67 {
  68         void *p = malloc(size);
  69         DIE_IF(!p);
  70         memset(p, 0, size);
  71         return p;
  72 }
  73
  74 static inline void *xalloc(unsigned long size)
  75 {
  76         void *p = malloc(size);
  77         DIE_IF(!p);
  78         return p;
  79 }
  80
  81 static inline void *zalloc(unsigned long size)
  82 {
  83         void *p = malloc(size);
  84         if(p)
  85                 memset(p, 0, size);
  86         return p;
  87 }
  88
  89 static inline void *xstrdup(char *str)
  90 {
  91         char *p = strdup(str);
  92         DIE_IF(!p);
  93         return p;
  94 }
  95
  96 static inline void *memdup(void *src, size_t size)
  97 {
  98         void *p;
  99         p = xalloc(size);
 100         memcpy(p, src, size);
 101         return p;
 102 }
 103
 104 #define x_isspace(x)  isspace((unsigned char)(x))
 105
 106 /* skip leading spaces */
 107 static inline char *skip_spaces(const char *p)
 108 {
 109         if (p)
 110                 while (*p && x_isspace(*p))
 111                         p++;
 112         return (char *)p;
 113 }
 114
 115 /* skip trailing spaces */
 116 static inline char *skip_spaces_rev(char *p)
 117 {
 118         if (p) {
 119                 size_t i = strlen(p);
 120                 if (i-- > 0) {
 121                         while (i && x_isspace(p[i]))
 122                                 i--;
 123                         p[i + 1] = 0;
 124                 }
 125         }
 126         return (char *)p;
 127 }
 128
 129 static inline char *skip_word(const char *p)
 130 {
 131         if (p)
 132                 while (*p && !x_isspace(*p))
 133                         p++;
 134         return (char *)p;
 135 }
 136
 137 /*
 138  * trims spaces around the word and returns
 139  * pointer to the start of word, the p will
 140  * be set the first character after the word
 141  */
 142 static inline char *trim_word(char **str)
 143 {
 144         char *start, *end;
 145
 146         if (!str)
 147                 return NULL;
 148
 149         start = skip_spaces(*str);
 150         end = skip_word(start);
 151         if (end != start) {
 152                 *end = 0;
 153                 *str = &end[1];
 154         }
 155         return start;
 156 }
 157
 158 #endif /* UTIL_H */