Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7/*
   8 * See if our compiler is known to support flexible array members.
   9 */
  10#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
  11# define FLEX_ARRAY /* empty */
  12#elif defined(__GNUC__)
  13# if (__GNUC__ >= 3)
  14#  define FLEX_ARRAY /* empty */
  15# else
  16#  define FLEX_ARRAY 0 /* older GNU extension */
  17# endif
  18#endif
  19
  20/*
  21 * Otherwise, default to safer but a bit wasteful traditional style
  22 */
  23#ifndef FLEX_ARRAY
  24# define FLEX_ARRAY 1
  25#endif
  26#endif
  27
  28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29
  30#ifdef __GNUC__
  31#define TYPEOF(x) (__typeof__(x))
  32#else
  33#define TYPEOF(x)
  34#endif
  35
  36#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
  37#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  38
  39/* Approximation of the length of the decimal representation of this type. */
  40#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  41
  42#if !defined(__APPLE__) && !defined(__FreeBSD__)
  43#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  44#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  45#endif
  46#define _ALL_SOURCE 1
  47#define _GNU_SOURCE 1
  48#define _BSD_SOURCE 1
  49
  50#include <unistd.h>
  51#include <stdio.h>
  52#include <sys/stat.h>
  53#include <fcntl.h>
  54#include <stddef.h>
  55#include <stdlib.h>
  56#include <stdarg.h>
  57#include <string.h>
  58#include <errno.h>
  59#include <limits.h>
  60#include <sys/param.h>
  61#include <sys/types.h>
  62#include <dirent.h>
  63#include <sys/time.h>
  64#include <time.h>
  65#include <signal.h>
  66#include <sys/wait.h>
  67#include <fnmatch.h>
  68#include <sys/poll.h>
  69#include <sys/socket.h>
  70#include <assert.h>
  71#include <regex.h>
  72#include <netinet/in.h>
  73#include <netinet/tcp.h>
  74#include <arpa/inet.h>
  75#include <netdb.h>
  76#include <pwd.h>
  77#include <inttypes.h>
  78#if defined(__CYGWIN__)
  79#undef _XOPEN_SOURCE
  80#include <grp.h>
  81#define _XOPEN_SOURCE 600
  82#else
  83#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  84#include <grp.h>
  85#define _ALL_SOURCE 1
  86#endif
  87
  88#ifndef NO_ICONV
  89#include <iconv.h>
  90#endif
  91
  92/* On most systems <limits.h> would have given us this, but
  93 * not on some systems (e.g. GNU/Hurd).
  94 */
  95#ifndef PATH_MAX
  96#define PATH_MAX 4096
  97#endif
  98
  99#ifndef PRIuMAX
 100#define PRIuMAX "llu"
 101#endif
 102
 103#ifdef __GNUC__
 104#define NORETURN __attribute__((__noreturn__))
 105#else
 106#define NORETURN
 107#ifndef __attribute__
 108#define __attribute__(x)
 109#endif
 110#endif
 111
 112/* General helper functions */
 113extern void usage(const char *err) NORETURN;
 114extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 115extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 116extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 117
 118extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 119extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 120extern void set_error_routine(void (*routine)(const char *err, va_list params));
 121extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 122
 123#ifdef NO_MMAP
 124
 125#ifndef PROT_READ
 126#define PROT_READ 1
 127#define PROT_WRITE 2
 128#define MAP_PRIVATE 1
 129#define MAP_FAILED ((void*)-1)
 130#endif
 131
 132#define mmap git_mmap
 133#define munmap git_munmap
 134extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 135extern int git_munmap(void *start, size_t length);
 136
 137/* This value must be multiple of (pagesize * 2) */
 138#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 139
 140#else /* NO_MMAP */
 141
 142#include <sys/mman.h>
 143
 144/* This value must be multiple of (pagesize * 2) */
 145#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 146        (sizeof(void*) >= 8 \
 147                ?  1 * 1024 * 1024 * 1024 \
 148                : 32 * 1024 * 1024)
 149
 150#endif /* NO_MMAP */
 151
 152#define DEFAULT_PACKED_GIT_LIMIT \
 153        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 154
 155#ifdef NO_PREAD
 156#define pread git_pread
 157extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 158#endif
 159
 160#ifdef NO_SETENV
 161#define setenv gitsetenv
 162extern int gitsetenv(const char *, const char *, int);
 163#endif
 164
 165#ifdef NO_MKDTEMP
 166#define mkdtemp gitmkdtemp
 167extern char *gitmkdtemp(char *);
 168#endif
 169
 170#ifdef NO_UNSETENV
 171#define unsetenv gitunsetenv
 172extern void gitunsetenv(const char *);
 173#endif
 174
 175#ifdef NO_STRCASESTR
 176#define strcasestr gitstrcasestr
 177extern char *gitstrcasestr(const char *haystack, const char *needle);
 178#endif
 179
 180#ifdef NO_STRLCPY
 181#define strlcpy gitstrlcpy
 182extern size_t gitstrlcpy(char *, const char *, size_t);
 183#endif
 184
 185#ifdef NO_STRTOUMAX
 186#define strtoumax gitstrtoumax
 187extern uintmax_t gitstrtoumax(const char *, char **, int);
 188#endif
 189
 190#ifdef NO_HSTRERROR
 191#define hstrerror githstrerror
 192extern const char *githstrerror(int herror);
 193#endif
 194
 195#ifdef NO_MEMMEM
 196#define memmem gitmemmem
 197void *gitmemmem(const void *haystack, size_t haystacklen,
 198                const void *needle, size_t needlelen);
 199#endif
 200
 201#ifdef __GLIBC_PREREQ
 202#if __GLIBC_PREREQ(2, 1)
 203#define HAVE_STRCHRNUL
 204#endif
 205#endif
 206
 207#ifndef HAVE_STRCHRNUL
 208#define strchrnul gitstrchrnul
 209static inline char *gitstrchrnul(const char *s, int c)
 210{
 211        while (*s && *s != c)
 212                s++;
 213        return (char *)s;
 214}
 215#endif
 216
 217extern void release_pack_memory(size_t, int);
 218
 219static inline char* xstrdup(const char *str)
 220{
 221        char *ret = strdup(str);
 222        if (!ret) {
 223                release_pack_memory(strlen(str) + 1, -1);
 224                ret = strdup(str);
 225                if (!ret)
 226                        die("Out of memory, strdup failed");
 227        }
 228        return ret;
 229}
 230
 231static inline void *xmalloc(size_t size)
 232{
 233        void *ret = malloc(size);
 234        if (!ret && !size)
 235                ret = malloc(1);
 236        if (!ret) {
 237                release_pack_memory(size, -1);
 238                ret = malloc(size);
 239                if (!ret && !size)
 240                        ret = malloc(1);
 241                if (!ret)
 242                        die("Out of memory, malloc failed");
 243        }
 244#ifdef XMALLOC_POISON
 245        memset(ret, 0xA5, size);
 246#endif
 247        return ret;
 248}
 249
 250static inline void *xmemdupz(const void *data, size_t len)
 251{
 252        char *p = xmalloc(len + 1);
 253        memcpy(p, data, len);
 254        p[len] = '\0';
 255        return p;
 256}
 257
 258static inline char *xstrndup(const char *str, size_t len)
 259{
 260        char *p = memchr(str, '\0', len);
 261        return xmemdupz(str, p ? p - str : len);
 262}
 263
 264static inline void *xrealloc(void *ptr, size_t size)
 265{
 266        void *ret = realloc(ptr, size);
 267        if (!ret && !size)
 268                ret = realloc(ptr, 1);
 269        if (!ret) {
 270                release_pack_memory(size, -1);
 271                ret = realloc(ptr, size);
 272                if (!ret && !size)
 273                        ret = realloc(ptr, 1);
 274                if (!ret)
 275                        die("Out of memory, realloc failed");
 276        }
 277        return ret;
 278}
 279
 280static inline void *xcalloc(size_t nmemb, size_t size)
 281{
 282        void *ret = calloc(nmemb, size);
 283        if (!ret && (!nmemb || !size))
 284                ret = calloc(1, 1);
 285        if (!ret) {
 286                release_pack_memory(nmemb * size, -1);
 287                ret = calloc(nmemb, size);
 288                if (!ret && (!nmemb || !size))
 289                        ret = calloc(1, 1);
 290                if (!ret)
 291                        die("Out of memory, calloc failed");
 292        }
 293        return ret;
 294}
 295
 296static inline void *xmmap(void *start, size_t length,
 297        int prot, int flags, int fd, off_t offset)
 298{
 299        void *ret = mmap(start, length, prot, flags, fd, offset);
 300        if (ret == MAP_FAILED) {
 301                if (!length)
 302                        return NULL;
 303                release_pack_memory(length, fd);
 304                ret = mmap(start, length, prot, flags, fd, offset);
 305                if (ret == MAP_FAILED)
 306                        die("Out of memory? mmap failed: %s", strerror(errno));
 307        }
 308        return ret;
 309}
 310
 311static inline ssize_t xread(int fd, void *buf, size_t len)
 312{
 313        ssize_t nr;
 314        while (1) {
 315                nr = read(fd, buf, len);
 316                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 317                        continue;
 318                return nr;
 319        }
 320}
 321
 322static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 323{
 324        ssize_t nr;
 325        while (1) {
 326                nr = write(fd, buf, len);
 327                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 328                        continue;
 329                return nr;
 330        }
 331}
 332
 333static inline int xdup(int fd)
 334{
 335        int ret = dup(fd);
 336        if (ret < 0)
 337                die("dup failed: %s", strerror(errno));
 338        return ret;
 339}
 340
 341static inline FILE *xfdopen(int fd, const char *mode)
 342{
 343        FILE *stream = fdopen(fd, mode);
 344        if (stream == NULL)
 345                die("Out of memory? fdopen failed: %s", strerror(errno));
 346        return stream;
 347}
 348
 349static inline int xmkstemp(char *template)
 350{
 351        int fd;
 352
 353        fd = mkstemp(template);
 354        if (fd < 0)
 355                die("Unable to create temporary file: %s", strerror(errno));
 356        return fd;
 357}
 358
 359static inline size_t xsize_t(off_t len)
 360{
 361        return (size_t)len;
 362}
 363
 364static inline int has_extension(const char *filename, const char *ext)
 365{
 366        size_t len = strlen(filename);
 367        size_t extlen = strlen(ext);
 368        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 369}
 370
 371/* Sane ctype - no locale, and works with signed chars */
 372#undef isspace
 373#undef isdigit
 374#undef isalpha
 375#undef isalnum
 376#undef tolower
 377#undef toupper
 378extern unsigned char sane_ctype[256];
 379#define GIT_SPACE 0x01
 380#define GIT_DIGIT 0x02
 381#define GIT_ALPHA 0x04
 382#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 383#define isspace(x) sane_istest(x,GIT_SPACE)
 384#define isdigit(x) sane_istest(x,GIT_DIGIT)
 385#define isalpha(x) sane_istest(x,GIT_ALPHA)
 386#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 387#define tolower(x) sane_case((unsigned char)(x), 0x20)
 388#define toupper(x) sane_case((unsigned char)(x), 0)
 389
 390static inline int sane_case(int x, int high)
 391{
 392        if (sane_istest(x, GIT_ALPHA))
 393                x = (x & ~0x20) | high;
 394        return x;
 395}
 396
 397static inline int prefixcmp(const char *str, const char *prefix)
 398{
 399        return strncmp(str, prefix, strlen(prefix));
 400}
 401
 402static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 403{
 404        unsigned long ul;
 405        char *p;
 406
 407        errno = 0;
 408        ul = strtoul(s, &p, base);
 409        if (errno || *p || p == s || (unsigned int) ul != ul)
 410                return -1;
 411        *result = ul;
 412        return 0;
 413}
 414
 415static inline int strtol_i(char const *s, int base, int *result)
 416{
 417        long ul;
 418        char *p;
 419
 420        errno = 0;
 421        ul = strtol(s, &p, base);
 422        if (errno || *p || p == s || (int) ul != ul)
 423                return -1;
 424        *result = ul;
 425        return 0;
 426}
 427
 428#endif