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