1 /* Utility definitions for C code of SXEmacs
3 Copyright (C) 1985-1987, 1992-1995 Free Software Foundation, Inc.
4 Copyright (C) 1993-1996 Richard Mlynarik.
5 Copyright (C) 1995, 1996, 2000 Ben Wing.
6 Copyright (C) 2004 Steve Youngs.
7 Copyright (C) 2011 Nelson Ferreira.
9 This file is part of SXEmacs
11 SXEmacs is free software: you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation, either version 3 of the License, or
14 (at your option) any later version.
16 SXEmacs is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 /* NOT synched with FSF */
25 #ifndef INCLUDED_sxe_utils_h_
26 #define INCLUDED_sxe_utils_h_
28 /* ------------------------ include files ------------------- */
30 /* We include the following generally useful header files so that you
31 don't have to worry about prototypes when using the standard C
32 library functions and macros. These files shouldn't be excessively
33 large so they shouldn't cause that much of a slowdown. */
36 #include <string.h> /* primarily for memcpy, etc. */
37 #include <stdio.h> /* NULL, etc. */
40 #include <stddef.h> /* offsetof */
41 #include <sys/types.h>
43 #if defined HAVE_STDBOOL_H
50 #elif defined(__GNUC__)
51 # define SXE_UNUSED(x) UNUSED_ ## x __attribute__((unused))
52 #elif defined(__LCLINT__)
53 # define SXE_UNUSED(x) /*@unused@*/ x
55 # define SXE_UNUSED(x) x
60 #define UNUSED(x) SXE_UNUSED(x)
65 # define SXE_SET_UNUSED(x) ((void)(x))
69 #elif defined(__GNUC__)
70 # define WEAK_EXTERN extern __attribute__((weak))
72 # error "Grrr, bloody 'ell, can't figure out how to create weak symbols"
76 #elif defined(__GNUC__)
77 # define WEAK __attribute__((weak))
79 # error "Grrr, bloody 'ell, can't figure out how to create weak symbols"
85 #define LIKELY(_x) __builtin_expect(!!(_x), 1)
90 #define UNLIKELY(_x) __builtin_expect(!!(_x), 0)
94 #define extern_inline static inline
96 #ifdef ALL_DEBUG_FLAGS
98 #define SXE_DEBUG_FLAG
101 #define __SXE_DEBUG__(args...) fprintf(stderr, "SXE " args)
102 #ifndef SXE_DEBUG_FLAG
103 #define SXE_DEBUG(args...)
105 #define SXE_DEBUG(args...) __SXE_DEBUG__(args)
107 #define SXE_DEBUG_PT(args...) SXE_DEBUG("[pthread]: " args)
108 #define SXE_CRITICAL(args...) __SXE_DEBUG__("CRITICAL: " args)
112 /* We define assert iff USE_ASSERTIONS or DEBUG_SXEMACS is defined.
113 Otherwise we define it to be empty. Quantify has shown that the
114 time the assert checks take is measurable so let's not include them
115 in production binaries. */
117 #ifdef USE_ASSERTIONS
118 /* Highly dubious kludge */
119 /* (thanks, Jamie, I feel better now -- ben) */
120 void assert_failed(const char *, int, const char *);
121 # define abort() (assert_failed (__FILE__, __LINE__, "abort()"))
122 # define assert(x) ((x) ? (void) 0 : assert_failed (__FILE__, __LINE__, #x))
124 # ifdef DEBUG_SXEMACS
125 # define assert(x) ((x) ? (void) 0 : (void) abort ())
132 #ifndef BITS_PER_CHAR
133 #define BITS_PER_CHAR 8
135 #define SXE_SHORTBITS (SIZEOF_SHORT * BITS_PER_CHAR)
136 #define SXE_INTBITS (SIZEOF_INT * BITS_PER_CHAR)
137 #define SXE_LONGBITS (SIZEOF_LONG * BITS_PER_CHAR)
138 #define SXE_LONG_LONG_BITS (SIZEOF_LONG_LONG_INT * BITS_PER_CHAR)
139 #define SXE_VOID_P_BITS (SIZEOF_VOID_P * BITS_PER_CHAR)
141 /* Also define min() and max(). (Some compilers put them in strange
142 places that won't be referenced by the above include files, such
143 as 'macros.h' under Solaris.) */
146 #define min(a,b) (((a) <= (b)) ? (a) : (b))
149 #define max(a,b) (((a) > (b)) ? (a) : (b))
153 #define countof(x) ((int) (sizeof(x)/sizeof((x)[0])))
155 #if !defined HAVE_DECL_STRDUP
156 extern char *strdup(const char *s);
157 #endif /* HAVE_DECL_STRDUP */
161 # if defined (__GNUC__) && (__GNUC__ >= 2)
162 # define PRINTF_ARGS(string_index,first_to_check) \
163 __attribute__ ((format (printf, string_index, first_to_check)))
165 # define PRINTF_ARGS(string_index,first_to_check)
169 #ifndef DOESNT_RETURN
170 # if defined __GNUC__
171 # if ((__GNUC__ > 2) || (__GNUC__ == 2) && (__GNUC_MINOR__ >= 5))
172 # define DOESNT_RETURN void
173 # define DECLARE_DOESNT_RETURN(decl) \
174 extern void decl __attribute__ ((noreturn))
175 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
176 /* Should be able to state multiple independent __attribute__s, but \
177 the losing syntax doesn't work that way, and screws losing cpp */ \
179 __attribute__ ((noreturn, format (printf, str, idx)))
181 # define DOESNT_RETURN void volatile
182 # define DECLARE_DOESNT_RETURN(decl) extern void volatile decl
183 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
184 extern void volatile decl PRINTF_ARGS(str,idx)
185 # endif /* GNUC 2.5 */
187 # define DOESNT_RETURN void
188 # define DECLARE_DOESNT_RETURN(decl) extern void decl
189 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
190 extern void decl PRINTF_ARGS(str,idx)
195 /* No type has a greater alignment requirement than max_align_t.
196 (except perhaps for types we don't use, like long double) */
213 # if defined (__GNUC__) && (__GNUC__ >= 2)
214 /* gcc has an extension that gives us exactly what we want. */
215 # define ALIGNOF(type) __alignof__ (type)
216 # elif ! defined (__cplusplus)
217 /* The following is mostly portable, except that:
218 - it doesn't work for inside out declarations like void (*) (void).
219 (so just call ALIGNOF with a typedef'ed name)
220 - it doesn't work with C++. The C++ committee has decided,
221 in its infinite wisdom, that:
222 "Types must be declared in declarations, not in expressions." */
223 # define ALIGNOF(type) offsetof (struct { char c; type member; }, member)
225 /* C++ is annoying, but it has a big bag of tricks.
226 The following doesn't have the "inside out" declaration bug C does. */
227 template < typename T > struct alignment_trick {
231 # define ALIGNOF(type) offsetof (alignment_trick<type>, member)
235 #define ALIGN_SIZE(len, unit) \
236 ((((len) + (unit) - 1) / (unit)) * (unit))
238 /* #### Yuck, this is kind of evil */
239 #define ALIGN_PTR(ptr, unit) \
240 ((void *) ALIGN_SIZE ((size_t) (ptr), unit))
243 #define DO_NOTHING do {} while (0)
246 #ifndef DECLARE_NOTHING
247 #define DECLARE_NOTHING struct nosuchstruct
252 #define xstrlen strlen
253 #define xstrcmp strcmp
254 #define xstrncmp strncmp
255 #define xstrncat strncat
258 xstrncpy(char* target, const char*source, size_t len)
259 __attribute__((always_inline));
261 xstrncpy(char* target, const char*source, size_t len)
264 return strncat(target,source,len-1);
267 #if !defined(FORBID_STRCPY)
268 # define xstrcat strcat
269 # define xstrcpy strcpy
270 # if defined(HAVE_STPCPY)
271 # define xstpcpy stpcpy
274 xstpcpy(char *target, const char *source)
275 __attribute__((always_inline));
277 xstpcpy(char *target, const char *source)
280 size_t len = xstrlen(source);
282 strcpy(target, source);
291 # define strcpy no_strcpy
293 no_strcpy(char*,const char*)
294 __attribute__((always_inline));
296 no_strcpy(char * SXE_UNUSED(target),const char * SXE_UNUSED(source))
304 # define strcat no_strcat
306 no_strcat(char*,const char*)
307 __attribute__((always_inline));
309 no_strcat(char * SXE_UNUSED(target), const char* SXE_UNUSED(source))
317 # define stpcpy no_stpcpy
318 # define xstpcpy no_stpcpy
320 no_stpcpy(char*,const char*)
321 __attribute__((always_inline));
323 no_stpcpy(char* SXE_UNUSED(target),const char* SXE_UNUSED(source))
331 #if defined HAVE_STPNCPY
332 # define xstpncpy stpncpy
335 xstpncpy(char *target, const char *source, size_t len)
336 __attribute__((always_inline));
338 xstpncpy(char *target, const char *source, size_t len)
341 xstrncpy(target, source, len);
345 #endif /* !HAVE_STPNCPY */
347 #define xmemcmp memcmp
348 #define xmemcpy memcpy
353 xmin_size_t(size_t a, size_t b)
354 __attribute__((always_inline));
356 xmin_size_t(size_t a, size_t b)