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 #if !defined(__APPLE__) && !defined(__FreeBSD)
  15 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  16 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  17 #endif
  18 #define _GNU_SOURCE
  19 #define _BSD_SOURCE
  20
  21 #include <unistd.h>
  22 #include <stdio.h>
  23 #include <sys/stat.h>
  24 #include <fcntl.h>
  25 #include <stddef.h>
  26 #include <stdlib.h>
  27 #include <stdarg.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <limits.h>
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33 #include <dirent.h>
  34 #include <sys/time.h>
  35 #include <time.h>
  36 #include <signal.h>
  37 #include <sys/wait.h>
  38 #include <fnmatch.h>
  39 #include <sys/poll.h>
  40 #include <sys/socket.h>
  41 #include <assert.h>
  42 #include <regex.h>
  43 #include <netinet/in.h>
  44 #include <netinet/tcp.h>
  45 #include <arpa/inet.h>
  46 #include <netdb.h>
  47 #include <pwd.h>
  48 #include <grp.h>
  49
  50 #ifndef NO_ICONV
  51 #include <iconv.h>
  52 #endif
  53
  54 /* On most systems <limits.h> would have given us this, but
  55  * not on some systems (e.g. GNU/Hurd).
  56  */
  57 #ifndef PATH_MAX
  58 #define PATH_MAX 4096
  59 #endif
  60
  61 #ifdef __GNUC__
  62 #define NORETURN __attribute__((__noreturn__))
  63 #else
  64 #define NORETURN
  65 #ifndef __attribute__
  66 #define __attribute__(x)
  67 #endif
  68 #endif
  69
  70 /* General helper functions */
  71 extern void usage(const char *err) NORETURN;
  72 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  73 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  74 extern void warn(const char *err, ...) __attribute__((format (printf, 1, 2)));
  75
  76 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  77 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  78 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  79 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
  80
  81 #ifdef NO_MMAP
  82
  83 #ifndef PROT_READ
  84 #define PROT_READ 1
  85 #define PROT_WRITE 2
  86 #define MAP_PRIVATE 1
  87 #define MAP_FAILED ((void*)-1)
  88 #endif
  89
  90 #define mmap gitfakemmap
  91 #define munmap gitfakemunmap
  92 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  93 extern int gitfakemunmap(void *start, size_t length);
  94
  95 #else /* NO_MMAP */
  96
  97 #include <sys/mman.h>
  98
  99 #endif /* NO_MMAP */
 100
 101 #ifdef NO_SETENV
 102 #define setenv gitsetenv
 103 extern int gitsetenv(const char *, const char *, int);
 104 #endif
 105
 106 #ifdef NO_UNSETENV
 107 #define unsetenv gitunsetenv
 108 extern void gitunsetenv(const char *);
 109 #endif
 110
 111 #ifdef NO_STRCASESTR
 112 #define strcasestr gitstrcasestr
 113 extern char *gitstrcasestr(const char *haystack, const char *needle);
 114 #endif
 115
 116 #ifdef NO_STRLCPY
 117 #define strlcpy gitstrlcpy
 118 extern size_t gitstrlcpy(char *, const char *, size_t);
 119 #endif
 120
 121 static inline char* xstrdup(const char *str)
 122 {
 123         char *ret = strdup(str);
 124         if (!ret)
 125                 die("Out of memory, strdup failed");
 126         return ret;
 127 }
 128
 129 static inline void *xmalloc(size_t size)
 130 {
 131         void *ret = malloc(size);
 132         if (!ret && !size)
 133                 ret = malloc(1);
 134         if (!ret)
 135                 die("Out of memory, malloc failed");
 136 #ifdef XMALLOC_POISON
 137         memset(ret, 0xA5, size);
 138 #endif
 139         return ret;
 140 }
 141
 142 static inline void *xrealloc(void *ptr, size_t size)
 143 {
 144         void *ret = realloc(ptr, size);
 145         if (!ret && !size)
 146                 ret = realloc(ptr, 1);
 147         if (!ret)
 148                 die("Out of memory, realloc failed");
 149         return ret;
 150 }
 151
 152 static inline void *xcalloc(size_t nmemb, size_t size)
 153 {
 154         void *ret = calloc(nmemb, size);
 155         if (!ret && (!nmemb || !size))
 156                 ret = calloc(1, 1);
 157         if (!ret)
 158                 die("Out of memory, calloc failed");
 159         return ret;
 160 }
 161
 162 static inline ssize_t xread(int fd, void *buf, size_t len)
 163 {
 164         ssize_t nr;
 165         while (1) {
 166                 nr = read(fd, buf, len);
 167                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 168                         continue;
 169                 return nr;
 170         }
 171 }
 172
 173 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 174 {
 175         ssize_t nr;
 176         while (1) {
 177                 nr = write(fd, buf, len);
 178                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 179                         continue;
 180                 return nr;
 181         }
 182 }
 183
 184 static inline int has_extension(const char *filename, const char *ext)
 185 {
 186         size_t len = strlen(filename);
 187         size_t extlen = strlen(ext);
 188         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 189 }
 190
 191 /* Sane ctype - no locale, and works with signed chars */
 192 #undef isspace
 193 #undef isdigit
 194 #undef isalpha
 195 #undef isalnum
 196 #undef tolower
 197 #undef toupper
 198 extern unsigned char sane_ctype[256];
 199 #define GIT_SPACE 0x01
 200 #define GIT_DIGIT 0x02
 201 #define GIT_ALPHA 0x04
 202 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 203 #define isspace(x) sane_istest(x,GIT_SPACE)
 204 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 205 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 206 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 207 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 208 #define toupper(x) sane_case((unsigned char)(x), 0)
 209
 210 static inline int sane_case(int x, int high)
 211 {
 212         if (sane_istest(x, GIT_ALPHA))
 213                 x = (x & ~0x20) | high;
 214         return x;
 215 }
 216
 217 #endif