1#ifndef GIT_COMPAT_UTIL_H
2#define GIT_COMPAT_UTIL_H
3
4#define _FILE_OFFSET_BITS 64
5
6#ifndef FLEX_ARRAY
7#if defined(__GNUC__) && (__GNUC__ < 3)
8#define FLEX_ARRAY 0
9#else
10#define FLEX_ARRAY /* empty */
11#endif
12#endif
13
14#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
15
16#ifdef __GNUC__
17#define TYPEOF(x) (__typeof__(x))
18#else
19#define TYPEOF(x)
20#endif
21
22#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
23
24/* Approximation of the length of the decimal representation of this type. */
25#define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
26
27#if !defined(__APPLE__) && !defined(__FreeBSD__)
28#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
29#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
30#endif
31#define _ALL_SOURCE 1
32#define _GNU_SOURCE 1
33#define _BSD_SOURCE 1
34
35#include <unistd.h>
36#include <stdio.h>
37#include <sys/stat.h>
38#include <fcntl.h>
39#include <stddef.h>
40#include <stdlib.h>
41#include <stdarg.h>
42#include <string.h>
43#include <errno.h>
44#include <limits.h>
45#include <sys/param.h>
46#include <sys/types.h>
47#include <dirent.h>
48#include <sys/time.h>
49#include <time.h>
50#include <signal.h>
51#include <sys/wait.h>
52#include <fnmatch.h>
53#include <sys/poll.h>
54#include <sys/socket.h>
55#include <assert.h>
56#include <regex.h>
57#include <netinet/in.h>
58#include <netinet/tcp.h>
59#include <arpa/inet.h>
60#include <netdb.h>
61#include <pwd.h>
62#include <inttypes.h>
63#if defined(__CYGWIN__)
64#undef _XOPEN_SOURCE
65#include <grp.h>
66#define _XOPEN_SOURCE 600
67#else
68#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
69#include <grp.h>
70#define _ALL_SOURCE 1
71#endif
72
73#ifndef NO_ICONV
74#include <iconv.h>
75#endif
76
77/* On most systems <limits.h> would have given us this, but
78 * not on some systems (e.g. GNU/Hurd).
79 */
80#ifndef PATH_MAX
81#define PATH_MAX 4096
82#endif
83
84#ifndef PRIuMAX
85#define PRIuMAX "llu"
86#endif
87
88#ifdef __GNUC__
89#define NORETURN __attribute__((__noreturn__))
90#else
91#define NORETURN
92#ifndef __attribute__
93#define __attribute__(x)
94#endif
95#endif
96
97/* General helper functions */
98extern void usage(const char *err) NORETURN;
99extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
100extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
101extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
102
103extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
104extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
105extern void set_error_routine(void (*routine)(const char *err, va_list params));
106extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
107
108#ifdef NO_MMAP
109
110#ifndef PROT_READ
111#define PROT_READ 1
112#define PROT_WRITE 2
113#define MAP_PRIVATE 1
114#define MAP_FAILED ((void*)-1)
115#endif
116
117#define mmap git_mmap
118#define munmap git_munmap
119extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
120extern int git_munmap(void *start, size_t length);
121
122/* This value must be multiple of (pagesize * 2) */
123#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
124
125#else /* NO_MMAP */
126
127#include <sys/mman.h>
128
129/* This value must be multiple of (pagesize * 2) */
130#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
131 (sizeof(void*) >= 8 \
132 ? 1 * 1024 * 1024 * 1024 \
133 : 32 * 1024 * 1024)
134
135#endif /* NO_MMAP */
136
137#define DEFAULT_PACKED_GIT_LIMIT \
138 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
139
140#ifdef NO_PREAD
141#define pread git_pread
142extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
143#endif
144
145#ifdef NO_SETENV
146#define setenv gitsetenv
147extern int gitsetenv(const char *, const char *, int);
148#endif
149
150#ifdef NO_MKDTEMP
151#define mkdtemp gitmkdtemp
152extern char *gitmkdtemp(char *);
153#endif
154
155#ifdef NO_UNSETENV
156#define unsetenv gitunsetenv
157extern void gitunsetenv(const char *);
158#endif
159
160#ifdef NO_STRCASESTR
161#define strcasestr gitstrcasestr
162extern char *gitstrcasestr(const char *haystack, const char *needle);
163#endif
164
165#ifdef NO_STRLCPY
166#define strlcpy gitstrlcpy
167extern size_t gitstrlcpy(char *, const char *, size_t);
168#endif
169
170#ifdef NO_STRTOUMAX
171#define strtoumax gitstrtoumax
172extern uintmax_t gitstrtoumax(const char *, char **, int);
173#endif
174
175#ifdef NO_HSTRERROR
176#define hstrerror githstrerror
177extern const char *githstrerror(int herror);
178#endif
179
180#ifdef NO_MEMMEM
181#define memmem gitmemmem
182void *gitmemmem(const void *haystack, size_t haystacklen,
183 const void *needle, size_t needlelen);
184#endif
185
186#ifdef __GLIBC_PREREQ
187#if __GLIBC_PREREQ(2, 1)
188#define HAVE_STRCHRNUL
189#endif
190#endif
191
192#ifndef HAVE_STRCHRNUL
193#define strchrnul gitstrchrnul
194static inline char *gitstrchrnul(const char *s, int c)
195{
196 while (*s && *s != c)
197 s++;
198 return (char *)s;
199}
200#endif
201
202extern void release_pack_memory(size_t, int);
203
204static inline char* xstrdup(const char *str)
205{
206 char *ret = strdup(str);
207 if (!ret) {
208 release_pack_memory(strlen(str) + 1, -1);
209 ret = strdup(str);
210 if (!ret)
211 die("Out of memory, strdup failed");
212 }
213 return ret;
214}
215
216static inline void *xmalloc(size_t size)
217{
218 void *ret = malloc(size);
219 if (!ret && !size)
220 ret = malloc(1);
221 if (!ret) {
222 release_pack_memory(size, -1);
223 ret = malloc(size);
224 if (!ret && !size)
225 ret = malloc(1);
226 if (!ret)
227 die("Out of memory, malloc failed");
228 }
229#ifdef XMALLOC_POISON
230 memset(ret, 0xA5, size);
231#endif
232 return ret;
233}
234
235static inline void *xmemdupz(const void *data, size_t len)
236{
237 char *p = xmalloc(len + 1);
238 memcpy(p, data, len);
239 p[len] = '\0';
240 return p;
241}
242
243static inline char *xstrndup(const char *str, size_t len)
244{
245 char *p = memchr(str, '\0', len);
246 return xmemdupz(str, p ? p - str : len);
247}
248
249static inline void *xrealloc(void *ptr, size_t size)
250{
251 void *ret = realloc(ptr, size);
252 if (!ret && !size)
253 ret = realloc(ptr, 1);
254 if (!ret) {
255 release_pack_memory(size, -1);
256 ret = realloc(ptr, size);
257 if (!ret && !size)
258 ret = realloc(ptr, 1);
259 if (!ret)
260 die("Out of memory, realloc failed");
261 }
262 return ret;
263}
264
265static inline void *xcalloc(size_t nmemb, size_t size)
266{
267 void *ret = calloc(nmemb, size);
268 if (!ret && (!nmemb || !size))
269 ret = calloc(1, 1);
270 if (!ret) {
271 release_pack_memory(nmemb * size, -1);
272 ret = calloc(nmemb, size);
273 if (!ret && (!nmemb || !size))
274 ret = calloc(1, 1);
275 if (!ret)
276 die("Out of memory, calloc failed");
277 }
278 return ret;
279}
280
281static inline void *xmmap(void *start, size_t length,
282 int prot, int flags, int fd, off_t offset)
283{
284 void *ret = mmap(start, length, prot, flags, fd, offset);
285 if (ret == MAP_FAILED) {
286 if (!length)
287 return NULL;
288 release_pack_memory(length, fd);
289 ret = mmap(start, length, prot, flags, fd, offset);
290 if (ret == MAP_FAILED)
291 die("Out of memory? mmap failed: %s", strerror(errno));
292 }
293 return ret;
294}
295
296static inline ssize_t xread(int fd, void *buf, size_t len)
297{
298 ssize_t nr;
299 while (1) {
300 nr = read(fd, buf, len);
301 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
302 continue;
303 return nr;
304 }
305}
306
307static inline ssize_t xwrite(int fd, const void *buf, size_t len)
308{
309 ssize_t nr;
310 while (1) {
311 nr = write(fd, buf, len);
312 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
313 continue;
314 return nr;
315 }
316}
317
318static inline int xdup(int fd)
319{
320 int ret = dup(fd);
321 if (ret < 0)
322 die("dup failed: %s", strerror(errno));
323 return ret;
324}
325
326static inline FILE *xfdopen(int fd, const char *mode)
327{
328 FILE *stream = fdopen(fd, mode);
329 if (stream == NULL)
330 die("Out of memory? fdopen failed: %s", strerror(errno));
331 return stream;
332}
333
334static inline int xmkstemp(char *template)
335{
336 int fd;
337
338 fd = mkstemp(template);
339 if (fd < 0)
340 die("Unable to create temporary file: %s", strerror(errno));
341 return fd;
342}
343
344static inline size_t xsize_t(off_t len)
345{
346 return (size_t)len;
347}
348
349static inline int has_extension(const char *filename, const char *ext)
350{
351 size_t len = strlen(filename);
352 size_t extlen = strlen(ext);
353 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
354}
355
356/* Sane ctype - no locale, and works with signed chars */
357#undef isspace
358#undef isdigit
359#undef isalpha
360#undef isalnum
361#undef tolower
362#undef toupper
363extern unsigned char sane_ctype[256];
364#define GIT_SPACE 0x01
365#define GIT_DIGIT 0x02
366#define GIT_ALPHA 0x04
367#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
368#define isspace(x) sane_istest(x,GIT_SPACE)
369#define isdigit(x) sane_istest(x,GIT_DIGIT)
370#define isalpha(x) sane_istest(x,GIT_ALPHA)
371#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
372#define tolower(x) sane_case((unsigned char)(x), 0x20)
373#define toupper(x) sane_case((unsigned char)(x), 0)
374
375static inline int sane_case(int x, int high)
376{
377 if (sane_istest(x, GIT_ALPHA))
378 x = (x & ~0x20) | high;
379 return x;
380}
381
382static inline int prefixcmp(const char *str, const char *prefix)
383{
384 return strncmp(str, prefix, strlen(prefix));
385}
386
387static inline int strtoul_ui(char const *s, int base, unsigned int *result)
388{
389 unsigned long ul;
390 char *p;
391
392 errno = 0;
393 ul = strtoul(s, &p, base);
394 if (errno || *p || p == s || (unsigned int) ul != ul)
395 return -1;
396 *result = ul;
397 return 0;
398}
399
400static inline int strtol_i(char const *s, int base, int *result)
401{
402 long ul;
403 char *p;
404
405 errno = 0;
406 ul = strtol(s, &p, base);
407 if (errno || *p || p == s || (int) ul != ul)
408 return -1;
409 *result = ul;
410 return 0;
411}
412
413#endif