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 #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>
  26
  27 #ifdef __GNUC__
  28 #define NORETURN __attribute__((__noreturn__))
  29 #else
  30 #define NORETURN
  31 #ifndef __attribute__
  32 #define __attribute__(x)
  33 #endif
  34 #endif
  35
  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)));
  40
  41 #ifdef NO_MMAP
  42
  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
  49
  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);
  54
  55 #else /* NO_MMAP */
  56
  57 #include <sys/mman.h>
  58
  59 #endif /* NO_MMAP */
  60
  61 #ifdef NO_SETENV
  62 #define setenv gitsetenv
  63 extern int gitsetenv(const char *, const char *, int);
  64 #endif
  65
  66 #ifdef NO_STRCASESTR
  67 #define strcasestr gitstrcasestr
  68 extern char *gitstrcasestr(const char *haystack, const char *needle);
  69 #endif
  70
  71 static inline void *xmalloc(size_t size)
  72 {
  73         void *ret = malloc(size);
  74         if (!ret && !size)
  75                 ret = malloc(1);
  76         if (!ret)
  77                 die("Out of memory, malloc failed");
  78         return ret;
  79 }
  80
  81 static inline void *xrealloc(void *ptr, size_t size)
  82 {
  83         void *ret = realloc(ptr, size);
  84         if (!ret && !size)
  85                 ret = realloc(ptr, 1);
  86         if (!ret)
  87                 die("Out of memory, realloc failed");
  88         return ret;
  89 }
  90
  91 static inline void *xcalloc(size_t nmemb, size_t size)
  92 {
  93         void *ret = calloc(nmemb, size);
  94         if (!ret && (!nmemb || !size))
  95                 ret = calloc(1, 1);
  96         if (!ret)
  97                 die("Out of memory, calloc failed");
  98         return ret;
  99 }
 100
 101 static inline ssize_t xread(int fd, void *buf, size_t len)
 102 {
 103         ssize_t nr;
 104         while (1) {
 105                 nr = read(fd, buf, len);
 106                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 107                         continue;
 108                 return nr;
 109         }
 110 }
 111
 112 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 113 {
 114         ssize_t nr;
 115         while (1) {
 116                 nr = write(fd, buf, len);
 117                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 118                         continue;
 119                 return nr;
 120         }
 121 }
 122
 123 /* Sane ctype - no locale, and works with signed chars */
 124 #undef isspace
 125 #undef isdigit
 126 #undef isalpha
 127 #undef isalnum
 128 #undef tolower
 129 #undef toupper
 130 extern unsigned char sane_ctype[256];
 131 #define GIT_SPACE 0x01
 132 #define GIT_DIGIT 0x02
 133 #define GIT_ALPHA 0x04
 134 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 135 #define isspace(x) sane_istest(x,GIT_SPACE)
 136 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 137 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 138 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 139 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 140 #define toupper(x) sane_case((unsigned char)(x), 0)
 141
 142 static inline int sane_case(int x, int high)
 143 {
 144         if (sane_istest(x, GIT_ALPHA))
 145                 x = (x & ~0x20) | high;
 146         return x;
 147 }
 148
 149 #ifndef MAXPATHLEN
 150 #define MAXPATHLEN 256
 151 #endif
 152 #endif