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
59 #define UNUSED(x) SXE_UNUSED(x)
63 #elif defined(__GNUC__)
64 # define WEAK_EXTERN extern __attribute__((weak))
66 # error "Grrr, bloody 'ell, can't figure out how to create weak symbols"
70 #elif defined(__GNUC__)
71 # define WEAK __attribute__((weak))
73 # error "Grrr, bloody 'ell, can't figure out how to create weak symbols"
79 #define LIKELY(_x) __builtin_expect(!!(_x), 1)
83 #define UNLIKELY(_x) __builtin_expect(!!(_x), 0)
87 #define extern_inline static inline
89 #ifdef ALL_DEBUG_FLAGS
91 #define SXE_DEBUG_FLAG
94 #define __SXE_DEBUG__(args...) fprintf(stderr, "SXE " args)
95 #ifndef SXE_DEBUG_FLAG
96 #define SXE_DEBUG(args...)
98 #define SXE_DEBUG(args...) __SXE_DEBUG__(args)
100 #define SXE_DEBUG_PT(args...) SXE_DEBUG("[pthread]: " args)
101 #define SXE_CRITICAL(args...) __SXE_DEBUG__("CRITICAL: " args)
105 /* We define assert iff USE_ASSERTIONS or DEBUG_SXEMACS is defined.
106 Otherwise we define it to be empty. Quantify has shown that the
107 time the assert checks take is measurable so let's not include them
108 in production binaries. */
110 #ifdef USE_ASSERTIONS
111 /* Highly dubious kludge */
112 /* (thanks, Jamie, I feel better now -- ben) */
113 void assert_failed(const char *, int, const char *);
114 # define abort() (assert_failed (__FILE__, __LINE__, "abort()"))
115 # define assert(x) ((x) ? (void) 0 : assert_failed (__FILE__, __LINE__, #x))
117 # ifdef DEBUG_SXEMACS
118 # define assert(x) ((x) ? (void) 0 : (void) abort ())
125 #ifndef BITS_PER_CHAR
126 #define BITS_PER_CHAR 8
128 #define SXE_SHORTBITS (SIZEOF_SHORT * BITS_PER_CHAR)
129 #define SXE_INTBITS (SIZEOF_INT * BITS_PER_CHAR)
130 #define SXE_LONGBITS (SIZEOF_LONG * BITS_PER_CHAR)
131 #define SXE_LONG_LONG_BITS (SIZEOF_LONG_LONG_INT * BITS_PER_CHAR)
132 #define SXE_VOID_P_BITS (SIZEOF_VOID_P * BITS_PER_CHAR)
134 /* Also define min() and max(). (Some compilers put them in strange
135 places that won't be referenced by the above include files, such
136 as 'macros.h' under Solaris.) */
139 #define min(a,b) (((a) <= (b)) ? (a) : (b))
142 #define max(a,b) (((a) > (b)) ? (a) : (b))
146 #define countof(x) ((int) (sizeof(x)/sizeof((x)[0])))
148 #if !defined HAVE_DECL_STRDUP
149 extern char *strdup(const char *s);
150 #endif /* HAVE_DECL_STRDUP */
154 # if defined (__GNUC__) && (__GNUC__ >= 2)
155 # define PRINTF_ARGS(string_index,first_to_check) \
156 __attribute__ ((format (printf, string_index, first_to_check)))
158 # define PRINTF_ARGS(string_index,first_to_check)
162 #ifndef DOESNT_RETURN
163 # if defined __GNUC__
164 # if ((__GNUC__ > 2) || (__GNUC__ == 2) && (__GNUC_MINOR__ >= 5))
165 # define DOESNT_RETURN void
166 # define DECLARE_DOESNT_RETURN(decl) \
167 extern void decl __attribute__ ((noreturn))
168 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
169 /* Should be able to state multiple independent __attribute__s, but \
170 the losing syntax doesn't work that way, and screws losing cpp */ \
172 __attribute__ ((noreturn, format (printf, str, idx)))
174 # define DOESNT_RETURN void volatile
175 # define DECLARE_DOESNT_RETURN(decl) extern void volatile decl
176 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
177 extern void volatile decl PRINTF_ARGS(str,idx)
178 # endif /* GNUC 2.5 */
180 # define DOESNT_RETURN void
181 # define DECLARE_DOESNT_RETURN(decl) extern void decl
182 # define DECLARE_DOESNT_RETURN_GCC_ATTRIBUTE_SYNTAX_SUCKS(decl,str,idx) \
183 extern void decl PRINTF_ARGS(str,idx)
188 /* No type has a greater alignment requirement than max_align_t.
189 (except perhaps for types we don't use, like long double) */
206 # if defined (__GNUC__) && (__GNUC__ >= 2)
207 /* gcc has an extension that gives us exactly what we want. */
208 # define ALIGNOF(type) __alignof__ (type)
209 # elif ! defined (__cplusplus)
210 /* The following is mostly portable, except that:
211 - it doesn't work for inside out declarations like void (*) (void).
212 (so just call ALIGNOF with a typedef'ed name)
213 - it doesn't work with C++. The C++ committee has decided,
214 in its infinite wisdom, that:
215 "Types must be declared in declarations, not in expressions." */
216 # define ALIGNOF(type) offsetof (struct { char c; type member; }, member)
218 /* C++ is annoying, but it has a big bag of tricks.
219 The following doesn't have the "inside out" declaration bug C does. */
220 template < typename T > struct alignment_trick {
224 # define ALIGNOF(type) offsetof (alignment_trick<type>, member)
228 #define ALIGN_SIZE(len, unit) \
229 ((((len) + (unit) - 1) / (unit)) * (unit))
231 /* #### Yuck, this is kind of evil */
232 #define ALIGN_PTR(ptr, unit) \
233 ((void *) ALIGN_SIZE ((size_t) (ptr), unit))
236 #define DO_NOTHING do {} while (0)
239 #ifndef DECLARE_NOTHING
240 #define DECLARE_NOTHING struct nosuchstruct
245 #define xstrlen strlen
246 #define xstrcmp strcmp
247 #define xstrncmp strncmp
248 #define xstrncat strncat
251 xstrncpy(char* target, const char*source, size_t len)
252 __attribute__((always_inline));
254 xstrncpy(char* target, const char*source, size_t len)
257 return strncat(target,source,len-1);
260 #if !defined(FORBID_STRCPY)
261 # define xstrcat strcat
262 # define xstrcpy strcpy
263 # if defined(HAVE_STPCPY)
264 # define xstpcpy stpcpy
267 xstpcpy(char *target, const char *source)
268 __attribute__((always_inline));
270 xstpcpy(char *target, const char *source)
273 size_t len = xstrlen(source);
275 strcpy(target, source);
284 # define strcpy no_strcpy
286 no_strcpy(char*,const char*)
287 __attribute__((always_inline));
289 no_strcpy(char * SXE_UNUSED(target),const char * SXE_UNUSED(source))
297 # define strcat no_strcat
299 no_strcat(char*,const char*)
300 __attribute__((always_inline));
302 no_strcat(char * SXE_UNUSED(target), const char* SXE_UNUSED(source))
310 # define stpcpy no_stpcpy
311 # define xstpcpy no_stpcpy
313 no_stpcpy(char*,const char*)
314 __attribute__((always_inline));
316 no_stpcpy(char* SXE_UNUSED(target),const char* SXE_UNUSED(source))
324 #if defined HAVE_STPNCPY
325 # define xstpncpy stpncpy
328 xstpncpy(char *target, const char *source, size_t len)
329 __attribute__((always_inline));
331 xstpncpy(char *target, const char *source, size_t len)
334 xstrncpy(target, source, len);
338 #endif /* !HAVE_STPNCPY */
340 #define xmemcmp memcmp
341 #define xmemcpy memcpy
346 xmin_size_t(size_t a, size_t b)
347 __attribute__((always_inline));
349 xmin_size_t(size_t a, size_t b)