Use #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
[git/git.git] / git-compat-util.h
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
3
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
12 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
13
14 #include <unistd.h>
15 #include <stdio.h>
16 #include <sys/stat.h>
17 #include <fcntl.h>
18 #include <stddef.h>
19 #include <stdlib.h>
20 #include <stdarg.h>
21 #include <string.h>
22 #include <errno.h>
23 #include <limits.h>
24 #include <sys/param.h>
25 #include <netinet/in.h>
26 #include <sys/types.h>
27 #include <dirent.h>
28
29 #ifdef __GNUC__
30 #define NORETURN __attribute__((__noreturn__))
31 #else
32 #define NORETURN
33 #ifndef __attribute__
34 #define __attribute__(x)
35 #endif
36 #endif
37
38 /* General helper functions */
39 extern void usage(const char *err) NORETURN;
40 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
41 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
42
43 #ifdef NO_MMAP
44
45 #ifndef PROT_READ
46 #define PROT_READ 1
47 #define PROT_WRITE 2
48 #define MAP_PRIVATE 1
49 #define MAP_FAILED ((void*)-1)
50 #endif
51
52 #define mmap gitfakemmap
53 #define munmap gitfakemunmap
54 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
55 extern int gitfakemunmap(void *start, size_t length);
56
57 #else /* NO_MMAP */
58
59 #include <sys/mman.h>
60
61 #endif /* NO_MMAP */
62
63 #ifdef NO_SETENV
64 #define setenv gitsetenv
65 extern int gitsetenv(const char *, const char *, int);
66 #endif
67
68 #ifdef NO_UNSETENV
69 #define unsetenv gitunsetenv
70 extern void gitunsetenv(const char *);
71 #endif
72
73 #ifdef NO_STRCASESTR
74 #define strcasestr gitstrcasestr
75 extern char *gitstrcasestr(const char *haystack, const char *needle);
76 #endif
77
78 static inline void *xmalloc(size_t size)
79 {
80 void *ret = malloc(size);
81 if (!ret && !size)
82 ret = malloc(1);
83 if (!ret)
84 die("Out of memory, malloc failed");
85 return ret;
86 }
87
88 static inline void *xrealloc(void *ptr, size_t size)
89 {
90 void *ret = realloc(ptr, size);
91 if (!ret && !size)
92 ret = realloc(ptr, 1);
93 if (!ret)
94 die("Out of memory, realloc failed");
95 return ret;
96 }
97
98 static inline void *xcalloc(size_t nmemb, size_t size)
99 {
100 void *ret = calloc(nmemb, size);
101 if (!ret && (!nmemb || !size))
102 ret = calloc(1, 1);
103 if (!ret)
104 die("Out of memory, calloc failed");
105 return ret;
106 }
107
108 static inline ssize_t xread(int fd, void *buf, size_t len)
109 {
110 ssize_t nr;
111 while (1) {
112 nr = read(fd, buf, len);
113 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
114 continue;
115 return nr;
116 }
117 }
118
119 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
120 {
121 ssize_t nr;
122 while (1) {
123 nr = write(fd, buf, len);
124 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
125 continue;
126 return nr;
127 }
128 }
129
130 /* Sane ctype - no locale, and works with signed chars */
131 #undef isspace
132 #undef isdigit
133 #undef isalpha
134 #undef isalnum
135 #undef tolower
136 #undef toupper
137 extern unsigned char sane_ctype[256];
138 #define GIT_SPACE 0x01
139 #define GIT_DIGIT 0x02
140 #define GIT_ALPHA 0x04
141 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
142 #define isspace(x) sane_istest(x,GIT_SPACE)
143 #define isdigit(x) sane_istest(x,GIT_DIGIT)
144 #define isalpha(x) sane_istest(x,GIT_ALPHA)
145 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
146 #define tolower(x) sane_case((unsigned char)(x), 0x20)
147 #define toupper(x) sane_case((unsigned char)(x), 0)
148
149 static inline int sane_case(int x, int high)
150 {
151 if (sane_istest(x, GIT_ALPHA))
152 x = (x & ~0x20) | high;
153 return x;
154 }
155
156 #ifndef MAXPATHLEN
157 #define MAXPATHLEN 256
158 #endif
159 #endif