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 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
  44 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
  45 extern void set_error_routine(void (*routine)(const char *err, va_list params));
  46
  47 #ifdef NO_MMAP
  48
  49 #ifndef PROT_READ
  50 #define PROT_READ 1
  51 #define PROT_WRITE 2
  52 #define MAP_PRIVATE 1
  53 #define MAP_FAILED ((void*)-1)
  54 #endif
  55
  56 #define mmap gitfakemmap
  57 #define munmap gitfakemunmap
  58 extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
  59 extern int gitfakemunmap(void *start, size_t length);
  60
  61 #else /* NO_MMAP */
  62
  63 #include <sys/mman.h>
  64
  65 #endif /* NO_MMAP */
  66
  67 #ifdef NO_SETENV
  68 #define setenv gitsetenv
  69 extern int gitsetenv(const char *, const char *, int);
  70 #endif
  71
  72 #ifdef NO_UNSETENV
  73 #define unsetenv gitunsetenv
  74 extern void gitunsetenv(const char *);
  75 #endif
  76
  77 #ifdef NO_STRCASESTR
  78 #define strcasestr gitstrcasestr
  79 extern char *gitstrcasestr(const char *haystack, const char *needle);
  80 #endif
  81
  82 #ifdef NO_STRLCPY
  83 #define strlcpy gitstrlcpy
  84 extern size_t gitstrlcpy(char *, const char *, size_t);
  85 #endif
  86
  87 static inline void *xmalloc(size_t size)
  88 {
  89         void *ret = malloc(size);
  90         if (!ret && !size)
  91                 ret = malloc(1);
  92         if (!ret)
  93                 die("Out of memory, malloc failed");
  94 #ifdef XMALLOC_POISON
  95         memset(ret, 0xA5, size);
  96 #endif
  97         return ret;
  98 }
  99
 100 static inline void *xrealloc(void *ptr, size_t size)
 101 {
 102         void *ret = realloc(ptr, size);
 103         if (!ret && !size)
 104                 ret = realloc(ptr, 1);
 105         if (!ret)
 106                 die("Out of memory, realloc failed");
 107         return ret;
 108 }
 109
 110 static inline void *xcalloc(size_t nmemb, size_t size)
 111 {
 112         void *ret = calloc(nmemb, size);
 113         if (!ret && (!nmemb || !size))
 114                 ret = calloc(1, 1);
 115         if (!ret)
 116                 die("Out of memory, calloc failed");
 117         return ret;
 118 }
 119
 120 static inline ssize_t xread(int fd, void *buf, size_t len)
 121 {
 122         ssize_t nr;
 123         while (1) {
 124                 nr = read(fd, buf, len);
 125                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 126                         continue;
 127                 return nr;
 128         }
 129 }
 130
 131 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 132 {
 133         ssize_t nr;
 134         while (1) {
 135                 nr = write(fd, buf, len);
 136                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 137                         continue;
 138                 return nr;
 139         }
 140 }
 141
 142 static inline int has_extension(const char *filename, int len, const char *ext)
 143 {
 144         int extlen = strlen(ext);
 145         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 146 }
 147
 148 /* Sane ctype - no locale, and works with signed chars */
 149 #undef isspace
 150 #undef isdigit
 151 #undef isalpha
 152 #undef isalnum
 153 #undef tolower
 154 #undef toupper
 155 extern unsigned char sane_ctype[256];
 156 #define GIT_SPACE 0x01
 157 #define GIT_DIGIT 0x02
 158 #define GIT_ALPHA 0x04
 159 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 160 #define isspace(x) sane_istest(x,GIT_SPACE)
 161 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 162 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 163 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 164 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 165 #define toupper(x) sane_case((unsigned char)(x), 0)
 166
 167 static inline int sane_case(int x, int high)
 168 {
 169         if (sane_istest(x, GIT_ALPHA))
 170                 x = (x & ~0x20) | high;
 171         return x;
 172 }
 173
 174 #ifndef MAXPATHLEN
 175 #define MAXPATHLEN 256
 176 #endif
 177 #endif