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