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