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 <sys/ioctl.h>
  71#include <sys/select.h>
  72#include <assert.h>
  73#include <regex.h>
  74#include <netinet/in.h>
  75#include <netinet/tcp.h>
  76#include <arpa/inet.h>
  77#include <netdb.h>
  78#include <pwd.h>
  79#include <inttypes.h>
  80#if defined(__CYGWIN__)
  81#undef _XOPEN_SOURCE
  82#include <grp.h>
  83#define _XOPEN_SOURCE 600
  84#else
  85#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  86#include <grp.h>
  87#define _ALL_SOURCE 1
  88#endif
  89
  90#ifndef NO_ICONV
  91#include <iconv.h>
  92#endif
  93
  94/* On most systems <limits.h> would have given us this, but
  95 * not on some systems (e.g. GNU/Hurd).
  96 */
  97#ifndef PATH_MAX
  98#define PATH_MAX 4096
  99#endif
 100
 101#ifndef PRIuMAX
 102#define PRIuMAX "llu"
 103#endif
 104
 105#ifdef __GNUC__
 106#define NORETURN __attribute__((__noreturn__))
 107#else
 108#define NORETURN
 109#ifndef __attribute__
 110#define __attribute__(x)
 111#endif
 112#endif
 113
 114/* General helper functions */
 115extern void usage(const char *err) NORETURN;
 116extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 117extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 118extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 119
 120extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 121extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 122extern void set_error_routine(void (*routine)(const char *err, va_list params));
 123extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 124
 125#ifdef NO_MMAP
 126
 127#ifndef PROT_READ
 128#define PROT_READ 1
 129#define PROT_WRITE 2
 130#define MAP_PRIVATE 1
 131#define MAP_FAILED ((void*)-1)
 132#endif
 133
 134#define mmap git_mmap
 135#define munmap git_munmap
 136extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 137extern int git_munmap(void *start, size_t length);
 138
 139/* This value must be multiple of (pagesize * 2) */
 140#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 141
 142#else /* NO_MMAP */
 143
 144#include <sys/mman.h>
 145
 146/* This value must be multiple of (pagesize * 2) */
 147#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 148        (sizeof(void*) >= 8 \
 149                ?  1 * 1024 * 1024 * 1024 \
 150                : 32 * 1024 * 1024)
 151
 152#endif /* NO_MMAP */
 153
 154#define DEFAULT_PACKED_GIT_LIMIT \
 155        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 156
 157#ifdef NO_PREAD
 158#define pread git_pread
 159extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 160#endif
 161
 162#ifdef NO_SETENV
 163#define setenv gitsetenv
 164extern int gitsetenv(const char *, const char *, int);
 165#endif
 166
 167#ifdef NO_MKDTEMP
 168#define mkdtemp gitmkdtemp
 169extern char *gitmkdtemp(char *);
 170#endif
 171
 172#ifdef NO_UNSETENV
 173#define unsetenv gitunsetenv
 174extern void gitunsetenv(const char *);
 175#endif
 176
 177#ifdef NO_STRCASESTR
 178#define strcasestr gitstrcasestr
 179extern char *gitstrcasestr(const char *haystack, const char *needle);
 180#endif
 181
 182#ifdef NO_STRLCPY
 183#define strlcpy gitstrlcpy
 184extern size_t gitstrlcpy(char *, const char *, size_t);
 185#endif
 186
 187#ifdef NO_STRTOUMAX
 188#define strtoumax gitstrtoumax
 189extern uintmax_t gitstrtoumax(const char *, char **, int);
 190#endif
 191
 192#ifdef NO_HSTRERROR
 193#define hstrerror githstrerror
 194extern const char *githstrerror(int herror);
 195#endif
 196
 197#ifdef NO_MEMMEM
 198#define memmem gitmemmem
 199void *gitmemmem(const void *haystack, size_t haystacklen,
 200                const void *needle, size_t needlelen);
 201#endif
 202
 203#ifdef __GLIBC_PREREQ
 204#if __GLIBC_PREREQ(2, 1)
 205#define HAVE_STRCHRNUL
 206#endif
 207#endif
 208
 209#ifndef HAVE_STRCHRNUL
 210#define strchrnul gitstrchrnul
 211static inline char *gitstrchrnul(const char *s, int c)
 212{
 213        while (*s && *s != c)
 214                s++;
 215        return (char *)s;
 216}
 217#endif
 218
 219extern void release_pack_memory(size_t, int);
 220
 221static inline char* xstrdup(const char *str)
 222{
 223        char *ret = strdup(str);
 224        if (!ret) {
 225                release_pack_memory(strlen(str) + 1, -1);
 226                ret = strdup(str);
 227                if (!ret)
 228                        die("Out of memory, strdup failed");
 229        }
 230        return ret;
 231}
 232
 233static inline void *xmalloc(size_t size)
 234{
 235        void *ret = malloc(size);
 236        if (!ret && !size)
 237                ret = malloc(1);
 238        if (!ret) {
 239                release_pack_memory(size, -1);
 240                ret = malloc(size);
 241                if (!ret && !size)
 242                        ret = malloc(1);
 243                if (!ret)
 244                        die("Out of memory, malloc failed");
 245        }
 246#ifdef XMALLOC_POISON
 247        memset(ret, 0xA5, size);
 248#endif
 249        return ret;
 250}
 251
 252static inline void *xmemdupz(const void *data, size_t len)
 253{
 254        char *p = xmalloc(len + 1);
 255        memcpy(p, data, len);
 256        p[len] = '\0';
 257        return p;
 258}
 259
 260static inline char *xstrndup(const char *str, size_t len)
 261{
 262        char *p = memchr(str, '\0', len);
 263        return xmemdupz(str, p ? p - str : len);
 264}
 265
 266static inline void *xrealloc(void *ptr, size_t size)
 267{
 268        void *ret = realloc(ptr, size);
 269        if (!ret && !size)
 270                ret = realloc(ptr, 1);
 271        if (!ret) {
 272                release_pack_memory(size, -1);
 273                ret = realloc(ptr, size);
 274                if (!ret && !size)
 275                        ret = realloc(ptr, 1);
 276                if (!ret)
 277                        die("Out of memory, realloc failed");
 278        }
 279        return ret;
 280}
 281
 282static inline void *xcalloc(size_t nmemb, size_t size)
 283{
 284        void *ret = calloc(nmemb, size);
 285        if (!ret && (!nmemb || !size))
 286                ret = calloc(1, 1);
 287        if (!ret) {
 288                release_pack_memory(nmemb * size, -1);
 289                ret = calloc(nmemb, size);
 290                if (!ret && (!nmemb || !size))
 291                        ret = calloc(1, 1);
 292                if (!ret)
 293                        die("Out of memory, calloc failed");
 294        }
 295        return ret;
 296}
 297
 298static inline void *xmmap(void *start, size_t length,
 299        int prot, int flags, int fd, off_t offset)
 300{
 301        void *ret = mmap(start, length, prot, flags, fd, offset);
 302        if (ret == MAP_FAILED) {
 303                if (!length)
 304                        return NULL;
 305                release_pack_memory(length, fd);
 306                ret = mmap(start, length, prot, flags, fd, offset);
 307                if (ret == MAP_FAILED)
 308                        die("Out of memory? mmap failed: %s", strerror(errno));
 309        }
 310        return ret;
 311}
 312
 313static inline ssize_t xread(int fd, void *buf, size_t len)
 314{
 315        ssize_t nr;
 316        while (1) {
 317                nr = read(fd, buf, len);
 318                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 319                        continue;
 320                return nr;
 321        }
 322}
 323
 324static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 325{
 326        ssize_t nr;
 327        while (1) {
 328                nr = write(fd, buf, len);
 329                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 330                        continue;
 331                return nr;
 332        }
 333}
 334
 335static inline int xdup(int fd)
 336{
 337        int ret = dup(fd);
 338        if (ret < 0)
 339                die("dup failed: %s", strerror(errno));
 340        return ret;
 341}
 342
 343static inline FILE *xfdopen(int fd, const char *mode)
 344{
 345        FILE *stream = fdopen(fd, mode);
 346        if (stream == NULL)
 347                die("Out of memory? fdopen failed: %s", strerror(errno));
 348        return stream;
 349}
 350
 351static inline int xmkstemp(char *template)
 352{
 353        int fd;
 354
 355        fd = mkstemp(template);
 356        if (fd < 0)
 357                die("Unable to create temporary file: %s", strerror(errno));
 358        return fd;
 359}
 360
 361static inline size_t xsize_t(off_t len)
 362{
 363        return (size_t)len;
 364}
 365
 366static inline int has_extension(const char *filename, const char *ext)
 367{
 368        size_t len = strlen(filename);
 369        size_t extlen = strlen(ext);
 370        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 371}
 372
 373/* Sane ctype - no locale, and works with signed chars */
 374#undef isspace
 375#undef isdigit
 376#undef isalpha
 377#undef isalnum
 378#undef tolower
 379#undef toupper
 380extern unsigned char sane_ctype[256];
 381#define GIT_SPACE 0x01
 382#define GIT_DIGIT 0x02
 383#define GIT_ALPHA 0x04
 384#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 385#define isspace(x) sane_istest(x,GIT_SPACE)
 386#define isdigit(x) sane_istest(x,GIT_DIGIT)
 387#define isalpha(x) sane_istest(x,GIT_ALPHA)
 388#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 389#define tolower(x) sane_case((unsigned char)(x), 0x20)
 390#define toupper(x) sane_case((unsigned char)(x), 0)
 391
 392static inline int sane_case(int x, int high)
 393{
 394        if (sane_istest(x, GIT_ALPHA))
 395                x = (x & ~0x20) | high;
 396        return x;
 397}
 398
 399static inline int prefixcmp(const char *str, const char *prefix)
 400{
 401        return strncmp(str, prefix, strlen(prefix));
 402}
 403
 404static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 405{
 406        unsigned long ul;
 407        char *p;
 408
 409        errno = 0;
 410        ul = strtoul(s, &p, base);
 411        if (errno || *p || p == s || (unsigned int) ul != ul)
 412                return -1;
 413        *result = ul;
 414        return 0;
 415}
 416
 417static inline int strtol_i(char const *s, int base, int *result)
 418{
 419        long ul;
 420        char *p;
 421
 422        errno = 0;
 423        ul = strtol(s, &p, base);
 424        if (errno || *p || p == s || (int) ul != ul)
 425                return -1;
 426        *result = ul;
 427        return 0;
 428}
 429
 430#endif