git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <sys/stat.h>
   7 #include <fcntl.h>
   8 #include <stddef.h>
   9 #include <stdlib.h>
  10 #include <stdarg.h>
  11 #include <string.h>
  12 #include <errno.h>
  13 #include <limits.h>
  14 #include <sys/param.h>
  15 #include <netinet/in.h>
  16 #include <sys/types.h>
  17 #include <dirent.h>
  18
  19 #ifdef __GNUC__
  20 #define NORETURN __attribute__((__noreturn__))
  21 #else
  22 #define NORETURN
  23 #ifndef __attribute__
  24 #define __attribute__(x)
  25 #endif
  26 #endif
  27
  28 /* General helper functions */
  29 extern void usage(const char *err) NORETURN;
  30 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
  31 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
  32
  33 #ifdef NO_MMAP
  34
  35 #ifndef PROT_READ
  36 #define PROT_READ 1
  37 #define PROT_WRITE 2
  38 #define MAP_PRIVATE 1
  39 #define MAP_FAILED ((void*)-1)
  40 #endif
  41
  42 #define mmap gitfakemmap
  43 #define munmap gitfakemunmap
  44 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  45 extern int gitfakemunmap(void *start, size_t length);
  46
  47 #else /* NO_MMAP */
  48
  49 #include <sys/mman.h>
  50
  51 #endif /* NO_MMAP */
  52
  53 #ifdef NO_SETENV
  54 #define setenv gitsetenv
  55 extern int gitsetenv(const char *, const char *, int);
  56 #endif
  57
  58 #ifdef NO_STRCASESTR
  59 #define strcasestr gitstrcasestr
  60 extern char *gitstrcasestr(const char *haystack, const char *needle);
  61 #endif
  62
  63 static inline void *xmalloc(size_t size)
  64 {
  65         void *ret = malloc(size);
  66         if (!ret && !size)
  67                 ret = malloc(1);
  68         if (!ret)
  69                 die("Out of memory, malloc failed");
  70         return ret;
  71 }
  72
  73 static inline void *xrealloc(void *ptr, size_t size)
  74 {
  75         void *ret = realloc(ptr, size);
  76         if (!ret && !size)
  77                 ret = realloc(ptr, 1);
  78         if (!ret)
  79                 die("Out of memory, realloc failed");
  80         return ret;
  81 }
  82
  83 static inline void *xcalloc(size_t nmemb, size_t size)
  84 {
  85         void *ret = calloc(nmemb, size);
  86         if (!ret && (!nmemb || !size))
  87                 ret = calloc(1, 1);
  88         if (!ret)
  89                 die("Out of memory, calloc failed");
  90         return ret;
  91 }
  92
  93 static inline ssize_t xread(int fd, void *buf, size_t len)
  94 {
  95         ssize_t nr;
  96         while (1) {
  97                 nr = read(fd, buf, len);
  98                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
  99                         continue;
 100                 return nr;
 101         }
 102 }
 103
 104 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 105 {
 106         ssize_t nr;
 107         while (1) {
 108                 nr = write(fd, buf, len);
 109                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 110                         continue;
 111                 return nr;
 112         }
 113 }
 114
 115 /* Sane ctype - no locale, and works with signed chars */
 116 #undef isspace
 117 #undef isdigit
 118 #undef isalpha
 119 #undef isalnum
 120 #undef tolower
 121 #undef toupper
 122 extern unsigned char sane_ctype[256];
 123 #define GIT_SPACE 0x01
 124 #define GIT_DIGIT 0x02
 125 #define GIT_ALPHA 0x04
 126 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 127 #define isspace(x) sane_istest(x,GIT_SPACE)
 128 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 129 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 130 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 131 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 132 #define toupper(x) sane_case((unsigned char)(x), 0)
 133
 134 static inline int sane_case(int x, int high)
 135 {
 136         if (sane_istest(x, GIT_ALPHA))
 137                 x = (x & ~0x20) | high;
 138         return x;
 139 }
 140
 141 #ifndef MAXPATHLEN
 142 #define MAXPATHLEN 256
 143 #endif
 144 #endif