Customizable error handlers
[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
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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 */
39extern void usage(const char *err) NORETURN;
40extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
41extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
42
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43extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
44extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
45extern void set_error_routine(void (*routine)(const char *err, va_list params));
46
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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
58extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
59extern 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
69extern int gitsetenv(const char *, const char *, int);
70#endif
71
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72#ifdef NO_UNSETENV
73#define unsetenv gitunsetenv
74extern void gitunsetenv(const char *);
75#endif
76
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77#ifdef NO_STRCASESTR
78#define strcasestr gitstrcasestr
79extern char *gitstrcasestr(const char *haystack, const char *needle);
80#endif
81
82static inline void *xmalloc(size_t size)
83{
84 void *ret = malloc(size);
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85 if (!ret && !size)
86 ret = malloc(1);
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87 if (!ret)
88 die("Out of memory, malloc failed");
89 return ret;
90}
91
92static inline void *xrealloc(void *ptr, size_t size)
93{
94 void *ret = realloc(ptr, size);
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95 if (!ret && !size)
96 ret = realloc(ptr, 1);
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97 if (!ret)
98 die("Out of memory, realloc failed");
99 return ret;
100}
101
102static inline void *xcalloc(size_t nmemb, size_t size)
103{
104 void *ret = calloc(nmemb, size);
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105 if (!ret && (!nmemb || !size))
106 ret = calloc(1, 1);
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107 if (!ret)
108 die("Out of memory, calloc failed");
109 return ret;
110}
111
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112static inline ssize_t xread(int fd, void *buf, size_t len)
113{
114 ssize_t nr;
115 while (1) {
116 nr = read(fd, buf, len);
117 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
118 continue;
119 return nr;
120 }
121}
122
123static inline ssize_t xwrite(int fd, const void *buf, size_t len)
124{
125 ssize_t nr;
126 while (1) {
127 nr = write(fd, buf, len);
128 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
129 continue;
130 return nr;
131 }
132}
133
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134/* Sane ctype - no locale, and works with signed chars */
135#undef isspace
136#undef isdigit
137#undef isalpha
138#undef isalnum
139#undef tolower
140#undef toupper
141extern unsigned char sane_ctype[256];
142#define GIT_SPACE 0x01
143#define GIT_DIGIT 0x02
144#define GIT_ALPHA 0x04
145#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
146#define isspace(x) sane_istest(x,GIT_SPACE)
147#define isdigit(x) sane_istest(x,GIT_DIGIT)
148#define isalpha(x) sane_istest(x,GIT_ALPHA)
149#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
150#define tolower(x) sane_case((unsigned char)(x), 0x20)
151#define toupper(x) sane_case((unsigned char)(x), 0)
152
153static inline int sane_case(int x, int high)
154{
155 if (sane_istest(x, GIT_ALPHA))
156 x = (x & ~0x20) | high;
157 return x;
158}
159
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160#ifndef MAXPATHLEN
161#define MAXPATHLEN 256
162#endif
4050c0df 163#endif