Rename gitfakemmap to git_mmap.
[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);
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94
95#else /* NO_MMAP */
96
97#include <sys/mman.h>
98
99#endif /* NO_MMAP */
100
101#ifdef NO_SETENV
102#define setenv gitsetenv
103extern int gitsetenv(const char *, const char *, int);
104#endif
105
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106#ifdef NO_UNSETENV
107#define unsetenv gitunsetenv
108extern void gitunsetenv(const char *);
109#endif
110
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111#ifdef NO_STRCASESTR
112#define strcasestr gitstrcasestr
113extern char *gitstrcasestr(const char *haystack, const char *needle);
114#endif
115
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116#ifdef NO_STRLCPY
117#define strlcpy gitstrlcpy
118extern size_t gitstrlcpy(char *, const char *, size_t);
119#endif
120
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121static inline char* xstrdup(const char *str)
122{
123 char *ret = strdup(str);
124 if (!ret)
125 die("Out of memory, strdup failed");
126 return ret;
127}
128
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129static inline void *xmalloc(size_t size)
130{
131 void *ret = malloc(size);
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132 if (!ret && !size)
133 ret = malloc(1);
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134 if (!ret)
135 die("Out of memory, malloc failed");
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136#ifdef XMALLOC_POISON
137 memset(ret, 0xA5, size);
138#endif
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139 return ret;
140}
141
142static inline void *xrealloc(void *ptr, size_t size)
143{
144 void *ret = realloc(ptr, size);
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145 if (!ret && !size)
146 ret = realloc(ptr, 1);
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147 if (!ret)
148 die("Out of memory, realloc failed");
149 return ret;
150}
151
152static inline void *xcalloc(size_t nmemb, size_t size)
153{
154 void *ret = calloc(nmemb, size);
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155 if (!ret && (!nmemb || !size))
156 ret = calloc(1, 1);
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157 if (!ret)
158 die("Out of memory, calloc failed");
159 return ret;
160}
161
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162static inline ssize_t xread(int fd, void *buf, size_t len)
163{
164 ssize_t nr;
165 while (1) {
166 nr = read(fd, buf, len);
167 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
168 continue;
169 return nr;
170 }
171}
172
173static inline ssize_t xwrite(int fd, const void *buf, size_t len)
174{
175 ssize_t nr;
176 while (1) {
177 nr = write(fd, buf, len);
178 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
179 continue;
180 return nr;
181 }
182}
183
5bb1cda5 184static inline int has_extension(const char *filename, const char *ext)
83a2b841 185{
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186 size_t len = strlen(filename);
187 size_t extlen = strlen(ext);
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188 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
189}
190
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191/* Sane ctype - no locale, and works with signed chars */
192#undef isspace
193#undef isdigit
194#undef isalpha
195#undef isalnum
196#undef tolower
197#undef toupper
198extern unsigned char sane_ctype[256];
199#define GIT_SPACE 0x01
200#define GIT_DIGIT 0x02
201#define GIT_ALPHA 0x04
202#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
203#define isspace(x) sane_istest(x,GIT_SPACE)
204#define isdigit(x) sane_istest(x,GIT_DIGIT)
205#define isalpha(x) sane_istest(x,GIT_ALPHA)
206#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
207#define tolower(x) sane_case((unsigned char)(x), 0x20)
208#define toupper(x) sane_case((unsigned char)(x), 0)
209
210static inline int sane_case(int x, int high)
211{
212 if (sane_istest(x, GIT_ALPHA))
213 x = (x & ~0x20) | high;
214 return x;
215}
216
217#endif