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