diff-tree -c: show a merge commit a bit more sensibly.
[git/jrn.git] / git-compat-util.h
blobf982b8e48469a5f09698808d1e55ded04d5923b8
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
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
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>
27 #ifdef __GNUC__
28 #define NORETURN __attribute__((__noreturn__))
29 #else
30 #define NORETURN
31 #ifndef __attribute__
32 #define __attribute__(x)
33 #endif
34 #endif
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)));
41 #ifdef NO_MMAP
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
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);
55 #else /* NO_MMAP */
57 #include <sys/mman.h>
59 #endif /* NO_MMAP */
61 #ifdef NO_SETENV
62 #define setenv gitsetenv
63 extern int gitsetenv(const char *, const char *, int);
64 #endif
66 #ifdef NO_UNSETENV
67 #define unsetenv gitunsetenv
68 extern void gitunsetenv(const char *);
69 #endif
71 #ifdef NO_STRCASESTR
72 #define strcasestr gitstrcasestr
73 extern char *gitstrcasestr(const char *haystack, const char *needle);
74 #endif
76 static inline void *xmalloc(size_t size)
78 void *ret = malloc(size);
79 if (!ret && !size)
80 ret = malloc(1);
81 if (!ret)
82 die("Out of memory, malloc failed");
83 return ret;
86 static inline void *xrealloc(void *ptr, size_t size)
88 void *ret = realloc(ptr, size);
89 if (!ret && !size)
90 ret = realloc(ptr, 1);
91 if (!ret)
92 die("Out of memory, realloc failed");
93 return ret;
96 static inline void *xcalloc(size_t nmemb, size_t size)
98 void *ret = calloc(nmemb, size);
99 if (!ret && (!nmemb || !size))
100 ret = calloc(1, 1);
101 if (!ret)
102 die("Out of memory, calloc failed");
103 return ret;
106 static inline ssize_t xread(int fd, void *buf, size_t len)
108 ssize_t nr;
109 while (1) {
110 nr = read(fd, buf, len);
111 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
112 continue;
113 return nr;
117 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
119 ssize_t nr;
120 while (1) {
121 nr = write(fd, buf, len);
122 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
123 continue;
124 return nr;
128 /* Sane ctype - no locale, and works with signed chars */
129 #undef isspace
130 #undef isdigit
131 #undef isalpha
132 #undef isalnum
133 #undef tolower
134 #undef toupper
135 extern unsigned char sane_ctype[256];
136 #define GIT_SPACE 0x01
137 #define GIT_DIGIT 0x02
138 #define GIT_ALPHA 0x04
139 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
140 #define isspace(x) sane_istest(x,GIT_SPACE)
141 #define isdigit(x) sane_istest(x,GIT_DIGIT)
142 #define isalpha(x) sane_istest(x,GIT_ALPHA)
143 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
144 #define tolower(x) sane_case((unsigned char)(x), 0x20)
145 #define toupper(x) sane_case((unsigned char)(x), 0)
147 static inline int sane_case(int x, int high)
149 if (sane_istest(x, GIT_ALPHA))
150 x = (x & ~0x20) | high;
151 return x;
154 #ifndef MAXPATHLEN
155 #define MAXPATHLEN 256
156 #endif
157 #endif