b2e18954c03ff502053cb74d142faab7d2a8dacb
[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 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
44 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
45 extern void set_error_routine(void (*routine)(const char *err, va_list params));
46
47 #ifdef NO_MMAP
48
49 #ifndef PROT_READ
50 #define PROT_READ 1
51 #define PROT_WRITE 2
52 #define MAP_PRIVATE 1
53 #define MAP_FAILED ((void*)-1)
54 #endif
55
56 #define mmap gitfakemmap
57 #define munmap gitfakemunmap
58 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
59 extern int gitfakemunmap(void *start, size_t length);
60
61 #else /* NO_MMAP */
62
63 #include <sys/mman.h>
64
65 #endif /* NO_MMAP */
66
67 #ifdef NO_SETENV
68 #define setenv gitsetenv
69 extern int gitsetenv(const char *, const char *, int);
70 #endif
71
72 #ifdef NO_UNSETENV
73 #define unsetenv gitunsetenv
74 extern void gitunsetenv(const char *);
75 #endif
76
77 #ifdef NO_STRCASESTR
78 #define strcasestr gitstrcasestr
79 extern char *gitstrcasestr(const char *haystack, const char *needle);
80 #endif
81
82 #ifdef NO_STRLCPY
83 #define strlcpy gitstrlcpy
84 extern size_t gitstrlcpy(char *, const char *, size_t);
85 #endif
86
87 static inline void *xmalloc(size_t size)
88 {
89 void *ret = malloc(size);
90 if (!ret && !size)
91 ret = malloc(1);
92 if (!ret)
93 die("Out of memory, malloc failed");
94 #ifdef XMALLOC_POISON
95 memset(ret, 0xA5, size);
96 #endif
97 return ret;
98 }
99
100 static inline void *xrealloc(void *ptr, size_t size)
101 {
102 void *ret = realloc(ptr, size);
103 if (!ret && !size)
104 ret = realloc(ptr, 1);
105 if (!ret)
106 die("Out of memory, realloc failed");
107 return ret;
108 }
109
110 static inline void *xcalloc(size_t nmemb, size_t size)
111 {
112 void *ret = calloc(nmemb, size);
113 if (!ret && (!nmemb || !size))
114 ret = calloc(1, 1);
115 if (!ret)
116 die("Out of memory, calloc failed");
117 return ret;
118 }
119
120 static inline ssize_t xread(int fd, void *buf, size_t len)
121 {
122 ssize_t nr;
123 while (1) {
124 nr = read(fd, buf, len);
125 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
126 continue;
127 return nr;
128 }
129 }
130
131 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
132 {
133 ssize_t nr;
134 while (1) {
135 nr = write(fd, buf, len);
136 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
137 continue;
138 return nr;
139 }
140 }
141
142 static inline int has_extension(const char *filename, const char *ext)
143 {
144 size_t len = strlen(filename);
145 size_t extlen = strlen(ext);
146 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
147 }
148
149 /* Sane ctype - no locale, and works with signed chars */
150 #undef isspace
151 #undef isdigit
152 #undef isalpha
153 #undef isalnum
154 #undef tolower
155 #undef toupper
156 extern unsigned char sane_ctype[256];
157 #define GIT_SPACE 0x01
158 #define GIT_DIGIT 0x02
159 #define GIT_ALPHA 0x04
160 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
161 #define isspace(x) sane_istest(x,GIT_SPACE)
162 #define isdigit(x) sane_istest(x,GIT_DIGIT)
163 #define isalpha(x) sane_istest(x,GIT_ALPHA)
164 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
165 #define tolower(x) sane_case((unsigned char)(x), 0x20)
166 #define toupper(x) sane_case((unsigned char)(x), 0)
167
168 static inline int sane_case(int x, int high)
169 {
170 if (sane_istest(x, GIT_ALPHA))
171 x = (x & ~0x20) | high;
172 return x;
173 }
174
175 #ifndef MAXPATHLEN
176 #define MAXPATHLEN 256
177 #endif
178 #endif