Fix a "label defined but unreferenced" warning.
[git/git.git] / git-compat-util.h
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1#ifndef GIT_COMPAT_UTIL_H
2#define GIT_COMPAT_UTIL_H
3
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4#ifndef FLEX_ARRAY
5#if defined(__GNUC__) && (__GNUC__ < 3)
6#define FLEX_ARRAY 0
7#else
8#define FLEX_ARRAY /* empty */
9#endif
10#endif
11
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12#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
13
95ca1c6c 14#if !defined(__APPLE__) && !defined(__FreeBSD__)
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15#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
16#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
c902c9a6 17#endif
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18#define _ALL_SOURCE 1
19#define _GNU_SOURCE 1
20#define _BSD_SOURCE 1
85023577 21
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22#include <unistd.h>
23#include <stdio.h>
24#include <sys/stat.h>
25#include <fcntl.h>
26#include <stddef.h>
27#include <stdlib.h>
28#include <stdarg.h>
29#include <string.h>
30#include <errno.h>
31#include <limits.h>
32#include <sys/param.h>
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33#include <sys/types.h>
34#include <dirent.h>
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35#include <sys/time.h>
36#include <time.h>
37#include <signal.h>
38#include <sys/wait.h>
39#include <fnmatch.h>
40#include <sys/poll.h>
41#include <sys/socket.h>
42#include <assert.h>
43#include <regex.h>
44#include <netinet/in.h>
45#include <netinet/tcp.h>
46#include <arpa/inet.h>
47#include <netdb.h>
48#include <pwd.h>
007e2ba6 49#include <inttypes.h>
fb952206 50#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
85023577 51#include <grp.h>
fb952206 52#define _ALL_SOURCE 1
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53
54#ifndef NO_ICONV
55#include <iconv.h>
56#endif
4050c0df 57
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58/* On most systems <limits.h> would have given us this, but
59 * not on some systems (e.g. GNU/Hurd).
60 */
61#ifndef PATH_MAX
62#define PATH_MAX 4096
63#endif
64
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65#ifdef __GNUC__
66#define NORETURN __attribute__((__noreturn__))
67#else
68#define NORETURN
69#ifndef __attribute__
70#define __attribute__(x)
71#endif
72#endif
73
74/* General helper functions */
75extern void usage(const char *err) NORETURN;
76extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
77extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
fa39b6b5 78extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
4050c0df 79
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80extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
81extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
82extern void set_error_routine(void (*routine)(const char *err, va_list params));
fa39b6b5 83extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
39a3f5ea 84
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85#ifdef NO_MMAP
86
87#ifndef PROT_READ
88#define PROT_READ 1
89#define PROT_WRITE 2
90#define MAP_PRIVATE 1
91#define MAP_FAILED ((void*)-1)
92#endif
93
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94#define mmap git_mmap
95#define munmap git_munmap
96extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
97extern int git_munmap(void *start, size_t length);
4050c0df 98
5faaf246 99/* This value must be multiple of (pagesize * 2) */
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100#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
101
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102#else /* NO_MMAP */
103
104#include <sys/mman.h>
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105
106/* This value must be multiple of (pagesize * 2) */
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107#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
108 (sizeof(void*) >= 8 \
109 ? 1 * 1024 * 1024 * 1024 \
110 : 32 * 1024 * 1024)
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111
112#endif /* NO_MMAP */
113
22bac0ea 114#define DEFAULT_PACKED_GIT_LIMIT \
ecaebf4a 115 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
8c82534d 116
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117#ifdef NO_PREAD
118#define pread git_pread
119extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
120#endif
121
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122#ifdef NO_SETENV
123#define setenv gitsetenv
124extern int gitsetenv(const char *, const char *, int);
125#endif
126
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127#ifdef NO_UNSETENV
128#define unsetenv gitunsetenv
129extern void gitunsetenv(const char *);
130#endif
131
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132#ifdef NO_STRCASESTR
133#define strcasestr gitstrcasestr
134extern char *gitstrcasestr(const char *haystack, const char *needle);
135#endif
136
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137#ifdef NO_STRLCPY
138#define strlcpy gitstrlcpy
139extern size_t gitstrlcpy(char *, const char *, size_t);
140#endif
141
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142#ifdef NO_STRTOUMAX
143#define strtoumax gitstrtoumax
144extern uintmax_t gitstrtoumax(const char *, char **, int);
145#endif
146
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147extern void release_pack_memory(size_t);
148
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149static inline char* xstrdup(const char *str)
150{
151 char *ret = strdup(str);
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152 if (!ret) {
153 release_pack_memory(strlen(str) + 1);
154 ret = strdup(str);
155 if (!ret)
156 die("Out of memory, strdup failed");
157 }
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158 return ret;
159}
160
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161static inline void *xmalloc(size_t size)
162{
163 void *ret = malloc(size);
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164 if (!ret && !size)
165 ret = malloc(1);
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166 if (!ret) {
167 release_pack_memory(size);
168 ret = malloc(size);
169 if (!ret && !size)
170 ret = malloc(1);
171 if (!ret)
172 die("Out of memory, malloc failed");
173 }
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174#ifdef XMALLOC_POISON
175 memset(ret, 0xA5, size);
176#endif
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177 return ret;
178}
179
180static inline void *xrealloc(void *ptr, size_t size)
181{
182 void *ret = realloc(ptr, size);
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183 if (!ret && !size)
184 ret = realloc(ptr, 1);
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185 if (!ret) {
186 release_pack_memory(size);
187 ret = realloc(ptr, size);
188 if (!ret && !size)
189 ret = realloc(ptr, 1);
190 if (!ret)
191 die("Out of memory, realloc failed");
192 }
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193 return ret;
194}
195
196static inline void *xcalloc(size_t nmemb, size_t size)
197{
198 void *ret = calloc(nmemb, size);
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199 if (!ret && (!nmemb || !size))
200 ret = calloc(1, 1);
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201 if (!ret) {
202 release_pack_memory(nmemb * size);
203 ret = calloc(nmemb, size);
204 if (!ret && (!nmemb || !size))
205 ret = calloc(1, 1);
206 if (!ret)
207 die("Out of memory, calloc failed");
208 }
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209 return ret;
210}
211
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212static inline void *xmmap(void *start, size_t length,
213 int prot, int flags, int fd, off_t offset)
214{
215 void *ret = mmap(start, length, prot, flags, fd, offset);
216 if (ret == MAP_FAILED) {
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217 if (!length)
218 return NULL;
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219 release_pack_memory(length);
220 ret = mmap(start, length, prot, flags, fd, offset);
221 if (ret == MAP_FAILED)
222 die("Out of memory? mmap failed: %s", strerror(errno));
223 }
224 return ret;
225}
226
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227static inline ssize_t xread(int fd, void *buf, size_t len)
228{
229 ssize_t nr;
230 while (1) {
231 nr = read(fd, buf, len);
232 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
233 continue;
234 return nr;
235 }
236}
237
238static inline ssize_t xwrite(int fd, const void *buf, size_t len)
239{
240 ssize_t nr;
241 while (1) {
242 nr = write(fd, buf, len);
243 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
244 continue;
245 return nr;
246 }
247}
248
5bb1cda5 249static inline int has_extension(const char *filename, const char *ext)
83a2b841 250{
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251 size_t len = strlen(filename);
252 size_t extlen = strlen(ext);
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253 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
254}
255
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256/* Sane ctype - no locale, and works with signed chars */
257#undef isspace
258#undef isdigit
259#undef isalpha
260#undef isalnum
261#undef tolower
262#undef toupper
263extern unsigned char sane_ctype[256];
264#define GIT_SPACE 0x01
265#define GIT_DIGIT 0x02
266#define GIT_ALPHA 0x04
267#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
268#define isspace(x) sane_istest(x,GIT_SPACE)
269#define isdigit(x) sane_istest(x,GIT_DIGIT)
270#define isalpha(x) sane_istest(x,GIT_ALPHA)
271#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
272#define tolower(x) sane_case((unsigned char)(x), 0x20)
273#define toupper(x) sane_case((unsigned char)(x), 0)
274
275static inline int sane_case(int x, int high)
276{
277 if (sane_istest(x, GIT_ALPHA))
278 x = (x & ~0x20) | high;
279 return x;
280}
281
282#endif