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