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 #ifndef __APPLE_CC__
  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
  75 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  76 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  77 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  78
  79 #ifdef NO_MMAP
  80
  81 #ifndef PROT_READ
  82 #define PROT_READ 1
  83 #define PROT_WRITE 2
  84 #define MAP_PRIVATE 1
  85 #define MAP_FAILED ((void*)-1)
  86 #endif
  87
  88 #define mmap gitfakemmap
  89 #define munmap gitfakemunmap
  90 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  91 extern int gitfakemunmap(void *start, size_t length);
  92
  93 #else /* NO_MMAP */
  94
  95 #include <sys/mman.h>
  96
  97 #endif /* NO_MMAP */
  98
  99 #ifdef NO_SETENV
 100 #define setenv gitsetenv
 101 extern int gitsetenv(const char *, const char *, int);
 102 #endif
 103
 104 #ifdef NO_UNSETENV
 105 #define unsetenv gitunsetenv
 106 extern void gitunsetenv(const char *);
 107 #endif
 108
 109 #ifdef NO_STRCASESTR
 110 #define strcasestr gitstrcasestr
 111 extern char *gitstrcasestr(const char *haystack, const char *needle);
 112 #endif
 113
 114 #ifdef NO_STRLCPY
 115 #define strlcpy gitstrlcpy
 116 extern size_t gitstrlcpy(char *, const char *, size_t);
 117 #endif
 118
 119 static inline char* xstrdup(const char *str)
 120 {
 121         char *ret = strdup(str);
 122         if (!ret)
 123                 die("Out of memory, strdup failed");
 124         return ret;
 125 }
 126
 127 static inline void *xmalloc(size_t size)
 128 {
 129         void *ret = malloc(size);
 130         if (!ret && !size)
 131                 ret = malloc(1);
 132         if (!ret)
 133                 die("Out of memory, malloc failed");
 134 #ifdef XMALLOC_POISON
 135         memset(ret, 0xA5, size);
 136 #endif
 137         return ret;
 138 }
 139
 140 static inline void *xrealloc(void *ptr, size_t size)
 141 {
 142         void *ret = realloc(ptr, size);
 143         if (!ret && !size)
 144                 ret = realloc(ptr, 1);
 145         if (!ret)
 146                 die("Out of memory, realloc failed");
 147         return ret;
 148 }
 149
 150 static inline void *xcalloc(size_t nmemb, size_t size)
 151 {
 152         void *ret = calloc(nmemb, size);
 153         if (!ret && (!nmemb || !size))
 154                 ret = calloc(1, 1);
 155         if (!ret)
 156                 die("Out of memory, calloc failed");
 157         return ret;
 158 }
 159
 160 static inline ssize_t xread(int fd, void *buf, size_t len)
 161 {
 162         ssize_t nr;
 163         while (1) {
 164                 nr = read(fd, buf, len);
 165                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 166                         continue;
 167                 return nr;
 168         }
 169 }
 170
 171 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 172 {
 173         ssize_t nr;
 174         while (1) {
 175                 nr = write(fd, buf, len);
 176                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 177                         continue;
 178                 return nr;
 179         }
 180 }
 181
 182 static inline int has_extension(const char *filename, const char *ext)
 183 {
 184         size_t len = strlen(filename);
 185         size_t extlen = strlen(ext);
 186         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 187 }
 188
 189 /* Sane ctype - no locale, and works with signed chars */
 190 #undef isspace
 191 #undef isdigit
 192 #undef isalpha
 193 #undef isalnum
 194 #undef tolower
 195 #undef toupper
 196 extern unsigned char sane_ctype[256];
 197 #define GIT_SPACE 0x01
 198 #define GIT_DIGIT 0x02
 199 #define GIT_ALPHA 0x04
 200 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 201 #define isspace(x) sane_istest(x,GIT_SPACE)
 202 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 203 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 204 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 205 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 206 #define toupper(x) sane_case((unsigned char)(x), 0)
 207
 208 static inline int sane_case(int x, int high)
 209 {
 210         if (sane_istest(x, GIT_ALPHA))
 211                 x = (x & ~0x20) | high;
 212         return x;
 213 }
 214
 215 #endif