config: Give error message when not changing a multivar
[git/dscho.git] / git-compat-util.h
blob40498b33c9f09ef9cac1f7340a9a1ceb2ffcd50d
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
4 #define _FILE_OFFSET_BITS 64
6 #ifndef FLEX_ARRAY
7 /*
8 * See if our compiler is known to support flexible array members.
9 */
10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
11 # define FLEX_ARRAY /* empty */
12 #elif defined(__GNUC__)
13 # if (__GNUC__ >= 3)
14 # define FLEX_ARRAY /* empty */
15 # else
16 # define FLEX_ARRAY 0 /* older GNU extension */
17 # endif
18 #endif
21 * Otherwise, default to safer but a bit wasteful traditional style
23 #ifndef FLEX_ARRAY
24 # define FLEX_ARRAY 1
25 #endif
26 #endif
28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
29 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
31 #define maximum_signed_value_of_type(a) \
32 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
34 #define maximum_unsigned_value_of_type(a) \
35 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
38 * Signed integer overflow is undefined in C, so here's a helper macro
39 * to detect if the sum of two integers will overflow.
41 * Requires: a >= 0, typeof(a) equals typeof(b)
43 #define signed_add_overflows(a, b) \
44 ((b) > maximum_signed_value_of_type(a) - (a))
46 #define unsigned_add_overflows(a, b) \
47 ((b) > maximum_unsigned_value_of_type(a) - (a))
49 #ifdef __GNUC__
50 #define TYPEOF(x) (__typeof__(x))
51 #else
52 #define TYPEOF(x)
53 #endif
55 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
56 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
60 /* Approximation of the length of the decimal representation of this type. */
61 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
63 #if defined(__sun__)
65 * On Solaris, when _XOPEN_EXTENDED is set, its header file
66 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
67 * setting to say we are XPG5 or XPG6. Also on Solaris,
68 * XPG6 programs must be compiled with a c99 compiler, while
69 * non XPG6 programs must be compiled with a pre-c99 compiler.
71 # if __STDC_VERSION__ - 0 >= 199901L
72 # define _XOPEN_SOURCE 600
73 # else
74 # define _XOPEN_SOURCE 500
75 # endif
76 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
77 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__)
78 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
79 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
80 #endif
81 #define _ALL_SOURCE 1
82 #define _GNU_SOURCE 1
83 #define _BSD_SOURCE 1
84 #define _NETBSD_SOURCE 1
85 #define _SGI_SOURCE 1
87 #ifdef WIN32 /* Both MinGW and MSVC */
88 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
89 #include <winsock2.h>
90 #include <windows.h>
91 #endif
93 #include <unistd.h>
94 #include <stdio.h>
95 #include <sys/stat.h>
96 #include <fcntl.h>
97 #include <stddef.h>
98 #include <stdlib.h>
99 #include <stdarg.h>
100 #include <string.h>
101 #include <errno.h>
102 #include <limits.h>
103 #include <sys/param.h>
104 #include <sys/types.h>
105 #include <dirent.h>
106 #include <sys/time.h>
107 #include <time.h>
108 #include <signal.h>
109 #include <fnmatch.h>
110 #include <assert.h>
111 #include <regex.h>
112 #include <utime.h>
113 #include <syslog.h>
114 #ifndef NO_SYS_POLL_H
115 #include <sys/poll.h>
116 #else
117 #include <poll.h>
118 #endif
119 #ifndef __MINGW32__
120 #include <sys/wait.h>
121 #include <sys/resource.h>
122 #include <sys/socket.h>
123 #include <sys/ioctl.h>
124 #include <termios.h>
125 #ifndef NO_SYS_SELECT_H
126 #include <sys/select.h>
127 #endif
128 #include <netinet/in.h>
129 #include <netinet/tcp.h>
130 #include <arpa/inet.h>
131 #include <netdb.h>
132 #include <pwd.h>
133 #ifndef NO_INTTYPES_H
134 #include <inttypes.h>
135 #else
136 #include <stdint.h>
137 #endif
138 #if defined(__CYGWIN__)
139 #undef _XOPEN_SOURCE
140 #include <grp.h>
141 #define _XOPEN_SOURCE 600
142 #include "compat/cygwin.h"
143 #else
144 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
145 #include <grp.h>
146 #define _ALL_SOURCE 1
147 #endif
148 #else /* __MINGW32__ */
149 /* pull in Windows compatibility stuff */
150 #include "compat/mingw.h"
151 #endif /* __MINGW32__ */
152 #ifdef _MSC_VER
153 #include "compat/msvc.h"
154 #endif
156 #ifndef NO_LIBGEN_H
157 #include <libgen.h>
158 #else
159 #define basename gitbasename
160 extern char *gitbasename(char *);
161 #endif
163 #ifndef NO_ICONV
164 #include <iconv.h>
165 #endif
167 #ifndef NO_OPENSSL
168 #include <openssl/ssl.h>
169 #include <openssl/err.h>
170 #endif
172 /* On most systems <limits.h> would have given us this, but
173 * not on some systems (e.g. GNU/Hurd).
175 #ifndef PATH_MAX
176 #define PATH_MAX 4096
177 #endif
179 #ifndef PRIuMAX
180 #define PRIuMAX "llu"
181 #endif
183 #ifndef PRIu32
184 #define PRIu32 "u"
185 #endif
187 #ifndef PRIx32
188 #define PRIx32 "x"
189 #endif
191 #ifndef PRIo32
192 #define PRIo32 "o"
193 #endif
195 #ifndef PATH_SEP
196 #define PATH_SEP ':'
197 #endif
199 #ifdef HAVE_PATHS_H
200 #include <paths.h>
201 #endif
202 #ifndef _PATH_DEFPATH
203 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
204 #endif
206 #ifndef STRIP_EXTENSION
207 #define STRIP_EXTENSION ""
208 #endif
210 #ifndef has_dos_drive_prefix
211 #define has_dos_drive_prefix(path) 0
212 #endif
214 #ifndef is_dir_sep
215 #define is_dir_sep(c) ((c) == '/')
216 #endif
218 #if __HP_cc >= 61000
219 #define NORETURN __attribute__((noreturn))
220 #define NORETURN_PTR
221 #elif defined(__GNUC__)
222 #define NORETURN __attribute__((__noreturn__))
223 #define NORETURN_PTR __attribute__((__noreturn__))
224 #elif defined(_MSC_VER)
225 #define NORETURN __declspec(noreturn)
226 #define NORETURN_PTR
227 #else
228 #define NORETURN
229 #define NORETURN_PTR
230 #ifndef __attribute__
231 #define __attribute__(x)
232 #endif
233 #endif
235 #include "compat/bswap.h"
237 /* General helper functions */
238 extern void vreportf(const char *prefix, const char *err, va_list params);
239 extern NORETURN void usage(const char *err);
240 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
241 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
242 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
243 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
244 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
246 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
248 extern int prefixcmp(const char *str, const char *prefix);
249 extern int suffixcmp(const char *str, const char *suffix);
251 static inline const char *skip_prefix(const char *str, const char *prefix)
253 size_t len = strlen(prefix);
254 return strncmp(str, prefix, len) ? NULL : str + len;
257 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
259 #ifndef PROT_READ
260 #define PROT_READ 1
261 #define PROT_WRITE 2
262 #define MAP_PRIVATE 1
263 #endif
265 #define mmap git_mmap
266 #define munmap git_munmap
267 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
268 extern int git_munmap(void *start, size_t length);
270 #else /* NO_MMAP || USE_WIN32_MMAP */
272 #include <sys/mman.h>
274 #endif /* NO_MMAP || USE_WIN32_MMAP */
276 #ifdef NO_MMAP
278 /* This value must be multiple of (pagesize * 2) */
279 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
281 #else /* NO_MMAP */
283 /* This value must be multiple of (pagesize * 2) */
284 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
285 (sizeof(void*) >= 8 \
286 ? 1 * 1024 * 1024 * 1024 \
287 : 32 * 1024 * 1024)
289 #endif /* NO_MMAP */
291 #ifndef MAP_FAILED
292 #define MAP_FAILED ((void *)-1)
293 #endif
295 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
296 #define on_disk_bytes(st) ((st).st_size)
297 #else
298 #define on_disk_bytes(st) ((st).st_blocks * 512)
299 #endif
301 #define DEFAULT_PACKED_GIT_LIMIT \
302 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
304 #ifdef NO_PREAD
305 #define pread git_pread
306 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
307 #endif
309 * Forward decl that will remind us if its twin in cache.h changes.
310 * This function is used in compat/pread.c. But we can't include
311 * cache.h there.
313 extern ssize_t read_in_full(int fd, void *buf, size_t count);
315 #ifdef NO_SETENV
316 #define setenv gitsetenv
317 extern int gitsetenv(const char *, const char *, int);
318 #endif
320 #ifdef NO_MKDTEMP
321 #define mkdtemp gitmkdtemp
322 extern char *gitmkdtemp(char *);
323 #endif
325 #ifdef NO_MKSTEMPS
326 #define mkstemps gitmkstemps
327 extern int gitmkstemps(char *, int);
328 #endif
330 #ifdef NO_UNSETENV
331 #define unsetenv gitunsetenv
332 extern void gitunsetenv(const char *);
333 #endif
335 #ifdef NO_STRCASESTR
336 #define strcasestr gitstrcasestr
337 extern char *gitstrcasestr(const char *haystack, const char *needle);
338 #endif
340 #ifdef NO_STRLCPY
341 #define strlcpy gitstrlcpy
342 extern size_t gitstrlcpy(char *, const char *, size_t);
343 #endif
345 #ifdef NO_STRTOUMAX
346 #define strtoumax gitstrtoumax
347 extern uintmax_t gitstrtoumax(const char *, char **, int);
348 #endif
350 #ifdef NO_STRTOK_R
351 #define strtok_r gitstrtok_r
352 extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
353 #endif
355 #ifdef NO_HSTRERROR
356 #define hstrerror githstrerror
357 extern const char *githstrerror(int herror);
358 #endif
360 #ifdef NO_MEMMEM
361 #define memmem gitmemmem
362 void *gitmemmem(const void *haystack, size_t haystacklen,
363 const void *needle, size_t needlelen);
364 #endif
366 #ifdef FREAD_READS_DIRECTORIES
367 #ifdef fopen
368 #undef fopen
369 #endif
370 #define fopen(a,b) git_fopen(a,b)
371 extern FILE *git_fopen(const char*, const char*);
372 #endif
374 #ifdef SNPRINTF_RETURNS_BOGUS
375 #define snprintf git_snprintf
376 extern int git_snprintf(char *str, size_t maxsize,
377 const char *format, ...);
378 #define vsnprintf git_vsnprintf
379 extern int git_vsnprintf(char *str, size_t maxsize,
380 const char *format, va_list ap);
381 #endif
383 #ifdef __GLIBC_PREREQ
384 #if __GLIBC_PREREQ(2, 1)
385 #define HAVE_STRCHRNUL
386 #define HAVE_MEMPCPY
387 #endif
388 #endif
390 #ifndef HAVE_STRCHRNUL
391 #define strchrnul gitstrchrnul
392 static inline char *gitstrchrnul(const char *s, int c)
394 while (*s && *s != c)
395 s++;
396 return (char *)s;
398 #endif
400 #ifndef HAVE_MEMPCPY
401 #define mempcpy gitmempcpy
402 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
404 return (char *)memcpy(dest, src, n) + n;
406 #endif
408 #ifdef NO_INET_PTON
409 int inet_pton(int af, const char *src, void *dst);
410 #endif
412 #ifdef NO_INET_NTOP
413 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
414 #endif
416 extern void release_pack_memory(size_t, int);
418 typedef void (*try_to_free_t)(size_t);
419 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
421 extern char *xstrdup(const char *str);
422 extern void *xmalloc(size_t size);
423 extern void *xmallocz(size_t size);
424 extern void *xmemdupz(const void *data, size_t len);
425 extern char *xstrndup(const char *str, size_t len);
426 extern void *xrealloc(void *ptr, size_t size);
427 extern void *xcalloc(size_t nmemb, size_t size);
428 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
429 extern ssize_t xread(int fd, void *buf, size_t len);
430 extern ssize_t xwrite(int fd, const void *buf, size_t len);
431 extern int xdup(int fd);
432 extern FILE *xfdopen(int fd, const char *mode);
433 extern int xmkstemp(char *template);
434 extern int xmkstemp_mode(char *template, int mode);
435 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
436 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
438 static inline size_t xsize_t(off_t len)
440 if (len > (size_t) len)
441 die("Cannot handle files this big");
442 return (size_t)len;
445 static inline int has_extension(const char *filename, const char *ext)
447 size_t len = strlen(filename);
448 size_t extlen = strlen(ext);
449 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
452 /* Sane ctype - no locale, and works with signed chars */
453 #undef isascii
454 #undef isspace
455 #undef isdigit
456 #undef isalpha
457 #undef isalnum
458 #undef tolower
459 #undef toupper
460 extern unsigned char sane_ctype[256];
461 #define GIT_SPACE 0x01
462 #define GIT_DIGIT 0x02
463 #define GIT_ALPHA 0x04
464 #define GIT_GLOB_SPECIAL 0x08
465 #define GIT_REGEX_SPECIAL 0x10
466 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
467 #define isascii(x) (((x) & ~0x7f) == 0)
468 #define isspace(x) sane_istest(x,GIT_SPACE)
469 #define isdigit(x) sane_istest(x,GIT_DIGIT)
470 #define isalpha(x) sane_istest(x,GIT_ALPHA)
471 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
472 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
473 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
474 #define tolower(x) sane_case((unsigned char)(x), 0x20)
475 #define toupper(x) sane_case((unsigned char)(x), 0)
477 static inline int sane_case(int x, int high)
479 if (sane_istest(x, GIT_ALPHA))
480 x = (x & ~0x20) | high;
481 return x;
484 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
486 unsigned long ul;
487 char *p;
489 errno = 0;
490 ul = strtoul(s, &p, base);
491 if (errno || *p || p == s || (unsigned int) ul != ul)
492 return -1;
493 *result = ul;
494 return 0;
497 static inline int strtol_i(char const *s, int base, int *result)
499 long ul;
500 char *p;
502 errno = 0;
503 ul = strtol(s, &p, base);
504 if (errno || *p || p == s || (int) ul != ul)
505 return -1;
506 *result = ul;
507 return 0;
510 #ifdef INTERNAL_QSORT
511 void git_qsort(void *base, size_t nmemb, size_t size,
512 int(*compar)(const void *, const void *));
513 #define qsort git_qsort
514 #endif
516 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
517 # define FORCE_DIR_SET_GID S_ISGID
518 #else
519 # define FORCE_DIR_SET_GID 0
520 #endif
522 #ifdef NO_NSEC
523 #undef USE_NSEC
524 #define ST_CTIME_NSEC(st) 0
525 #define ST_MTIME_NSEC(st) 0
526 #else
527 #ifdef USE_ST_TIMESPEC
528 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
529 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
530 #else
531 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
532 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
533 #endif
534 #endif
536 #ifdef UNRELIABLE_FSTAT
537 #define fstat_is_reliable() 0
538 #else
539 #define fstat_is_reliable() 1
540 #endif
542 #ifndef va_copy
544 * Since an obvious implementation of va_list would be to make it a
545 * pointer into the stack frame, a simple assignment will work on
546 * many systems. But let's try to be more portable.
548 #ifdef __va_copy
549 #define va_copy(dst, src) __va_copy(dst, src)
550 #else
551 #define va_copy(dst, src) ((dst) = (src))
552 #endif
553 #endif
556 * Preserves errno, prints a message, but gives no warning for ENOENT.
557 * Always returns the return value of unlink(2).
559 int unlink_or_warn(const char *path);
561 * Likewise for rmdir(2).
563 int rmdir_or_warn(const char *path);
565 * Calls the correct function out of {unlink,rmdir}_or_warn based on
566 * the supplied file mode.
568 int remove_or_warn(unsigned int mode, const char *path);
570 #endif