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 #include <unistd.h>
  15 #include <stdio.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <stddef.h>
  19 #include <stdlib.h>
  20 #include <stdarg.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <sys/param.h>
  25 #include <netinet/in.h>
  26 #include <sys/types.h>
  27 #include <dirent.h>
  28
  29 #ifdef __GNUC__
  30 #define NORETURN __attribute__((__noreturn__))
  31 #else
  32 #define NORETURN
  33 #ifndef __attribute__
  34 #define __attribute__(x)
  35 #endif
  36 #endif
  37
  38 /* General helper functions */
  39 extern void usage(const char *err) NORETURN;
  40 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  41 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  42
  43 #ifdef NO_MMAP
  44
  45 #ifndef PROT_READ
  46 #define PROT_READ 1
  47 #define PROT_WRITE 2
  48 #define MAP_PRIVATE 1
  49 #define MAP_FAILED ((void*)-1)
  50 #endif
  51
  52 #define mmap gitfakemmap
  53 #define munmap gitfakemunmap
  54 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  55 extern int gitfakemunmap(void *start, size_t length);
  56
  57 #else /* NO_MMAP */
  58
  59 #include <sys/mman.h>
  60
  61 #endif /* NO_MMAP */
  62
  63 #ifdef NO_SETENV
  64 #define setenv gitsetenv
  65 extern int gitsetenv(const char *, const char *, int);
  66 #endif
  67
  68 #ifdef NO_UNSETENV
  69 #define unsetenv gitunsetenv
  70 extern void gitunsetenv(const char *);
  71 #endif
  72
  73 #ifdef NO_STRCASESTR
  74 #define strcasestr gitstrcasestr
  75 extern char *gitstrcasestr(const char *haystack, const char *needle);
  76 #endif
  77
  78 static inline void *xmalloc(size_t size)
  79 {
  80         void *ret = malloc(size);
  81         if (!ret && !size)
  82                 ret = malloc(1);
  83         if (!ret)
  84                 die("Out of memory, malloc failed");
  85         return ret;
  86 }
  87
  88 static inline void *xrealloc(void *ptr, size_t size)
  89 {
  90         void *ret = realloc(ptr, size);
  91         if (!ret && !size)
  92                 ret = realloc(ptr, 1);
  93         if (!ret)
  94                 die("Out of memory, realloc failed");
  95         return ret;
  96 }
  97
  98 static inline void *xcalloc(size_t nmemb, size_t size)
  99 {
 100         void *ret = calloc(nmemb, size);
 101         if (!ret && (!nmemb || !size))
 102                 ret = calloc(1, 1);
 103         if (!ret)
 104                 die("Out of memory, calloc failed");
 105         return ret;
 106 }
 107
 108 static inline ssize_t xread(int fd, void *buf, size_t len)
 109 {
 110         ssize_t nr;
 111         while (1) {
 112                 nr = read(fd, buf, len);
 113                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 114                         continue;
 115                 return nr;
 116         }
 117 }
 118
 119 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 120 {
 121         ssize_t nr;
 122         while (1) {
 123                 nr = write(fd, buf, len);
 124                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 125                         continue;
 126                 return nr;
 127         }
 128 }
 129
 130 /* Sane ctype - no locale, and works with signed chars */
 131 #undef isspace
 132 #undef isdigit
 133 #undef isalpha
 134 #undef isalnum
 135 #undef tolower
 136 #undef toupper
 137 extern unsigned char sane_ctype[256];
 138 #define GIT_SPACE 0x01
 139 #define GIT_DIGIT 0x02
 140 #define GIT_ALPHA 0x04
 141 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 142 #define isspace(x) sane_istest(x,GIT_SPACE)
 143 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 144 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 145 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 146 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 147 #define toupper(x) sane_case((unsigned char)(x), 0)
 148
 149 static inline int sane_case(int x, int high)
 150 {
 151         if (sane_istest(x, GIT_ALPHA))
 152                 x = (x & ~0x20) | high;
 153         return x;
 154 }
 155
 156 #ifndef MAXPATHLEN
 157 #define MAXPATHLEN 256
 158 #endif
 159 #endif