[thirdparty/git.git] / git-compat-util.h

#ifndef GIT_COMPAT_UTIL_H
#define GIT_COMPAT_UTIL_H

#define _FILE_OFFSET_BITS 64

#ifndef FLEX_ARRAY
/*
 * See if our compiler is known to support flexible array members.
 */
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define FLEX_ARRAY /* empty */
#elif defined(__GNUC__)
# if (__GNUC__ >= 3)
#  define FLEX_ARRAY /* empty */
# else
#  define FLEX_ARRAY 0 /* older GNU extension */
# endif
#endif

/*
 * Otherwise, default to safer but a bit wasteful traditional style
 */
#ifndef FLEX_ARRAY
# define FLEX_ARRAY 1
#endif
#endif

#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))

#ifdef __GNUC__
#define TYPEOF(x) (__typeof__(x))
#else
#define TYPEOF(x)
#endif

#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */

/* Approximation of the length of the decimal representation of this type. */
#define decimal_length(x)	((int)(sizeof(x) * 2.56 + 0.5) + 1)

#if !defined(__APPLE__) && !defined(__FreeBSD__)  && !defined(__USLC__) && !defined(_M_UNIX)
#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
#endif
#define _ALL_SOURCE 1
#define _GNU_SOURCE 1
#define _BSD_SOURCE 1

#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>
#include <fnmatch.h>
#include <assert.h>
#include <regex.h>
#include <utime.h>
#ifndef __MINGW32__
#include <sys/wait.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#ifndef NO_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pwd.h>
#include <inttypes.h>
#if defined(__CYGWIN__)
#undef _XOPEN_SOURCE
#include <grp.h>
#define _XOPEN_SOURCE 600
#else
#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
#include <grp.h>
#define _ALL_SOURCE 1
#endif
#else 	/* __MINGW32__ */
/* pull in Windows compatibility stuff */
#include "compat/mingw.h"
#endif	/* __MINGW32__ */

#ifndef NO_ICONV
#include <iconv.h>
#endif

/* On most systems <limits.h> would have given us this, but
 * not on some systems (e.g. GNU/Hurd).
 */
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif

#ifndef PRIuMAX
#define PRIuMAX "llu"
#endif

#ifndef PATH_SEP
#define PATH_SEP ':'
#endif

#ifndef has_dos_drive_prefix
#define has_dos_drive_prefix(path) 0
#endif

#ifndef is_dir_sep
#define is_dir_sep(c) ((c) == '/')
#endif

#ifdef __GNUC__
#define NORETURN __attribute__((__noreturn__))
#else
#define NORETURN
#ifndef __attribute__
#define __attribute__(x)
#endif
#endif

/* General helper functions */
extern void usage(const char *err) NORETURN;
extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));

extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
extern void set_error_routine(void (*routine)(const char *err, va_list params));
extern void set_warn_routine(void (*routine)(const char *warn, va_list params));

extern int prefixcmp(const char *str, const char *prefix);

#ifdef NO_MMAP

#ifndef PROT_READ
#define PROT_READ 1
#define PROT_WRITE 2
#define MAP_PRIVATE 1
#define MAP_FAILED ((void*)-1)
#endif

#define mmap git_mmap
#define munmap git_munmap
extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
extern int git_munmap(void *start, size_t length);

/* This value must be multiple of (pagesize * 2) */
#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)

#else /* NO_MMAP */

#include <sys/mman.h>

/* This value must be multiple of (pagesize * 2) */
#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
	(sizeof(void*) >= 8 \
		?  1 * 1024 * 1024 * 1024 \
		: 32 * 1024 * 1024)

#endif /* NO_MMAP */

#define DEFAULT_PACKED_GIT_LIMIT \
	((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))

#ifdef NO_PREAD
#define pread git_pread
extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
#endif

#ifdef NO_SETENV
#define setenv gitsetenv
extern int gitsetenv(const char *, const char *, int);
#endif

#ifdef NO_MKDTEMP
#define mkdtemp gitmkdtemp
extern char *gitmkdtemp(char *);
#endif

#ifdef NO_UNSETENV
#define unsetenv gitunsetenv
extern void gitunsetenv(const char *);
#endif

#ifdef NO_STRCASESTR
#define strcasestr gitstrcasestr
extern char *gitstrcasestr(const char *haystack, const char *needle);
#endif

#ifdef NO_STRLCPY
#define strlcpy gitstrlcpy
extern size_t gitstrlcpy(char *, const char *, size_t);
#endif

#ifdef NO_STRTOUMAX
#define strtoumax gitstrtoumax
extern uintmax_t gitstrtoumax(const char *, char **, int);
#endif

#ifdef NO_HSTRERROR
#define hstrerror githstrerror
extern const char *githstrerror(int herror);
#endif

#ifdef NO_MEMMEM
#define memmem gitmemmem
void *gitmemmem(const void *haystack, size_t haystacklen,
                const void *needle, size_t needlelen);
#endif

#ifdef FREAD_READS_DIRECTORIES
#ifdef fopen
#undef fopen
#endif
#define fopen(a,b) git_fopen(a,b)
extern FILE *git_fopen(const char*, const char*);
#endif

#ifdef SNPRINTF_RETURNS_BOGUS
#define snprintf git_snprintf
extern int git_snprintf(char *str, size_t maxsize,
			const char *format, ...);
#define vsnprintf git_vsnprintf
extern int git_vsnprintf(char *str, size_t maxsize,
			 const char *format, va_list ap);
#endif

#ifdef __GLIBC_PREREQ
#if __GLIBC_PREREQ(2, 1)
#define HAVE_STRCHRNUL
#endif
#endif

#ifndef HAVE_STRCHRNUL
#define strchrnul gitstrchrnul
static inline char *gitstrchrnul(const char *s, int c)
{
	while (*s && *s != c)
		s++;
	return (char *)s;
}
#endif

extern void release_pack_memory(size_t, int);

static inline char* xstrdup(const char *str)
{
	char *ret = strdup(str);
	if (!ret) {
		release_pack_memory(strlen(str) + 1, -1);
		ret = strdup(str);
		if (!ret)
			die("Out of memory, strdup failed");
	}
	return ret;
}

static inline void *xmalloc(size_t size)
{
	void *ret = malloc(size);
	if (!ret && !size)
		ret = malloc(1);
	if (!ret) {
		release_pack_memory(size, -1);
		ret = malloc(size);
		if (!ret && !size)
			ret = malloc(1);
		if (!ret)
			die("Out of memory, malloc failed");
	}
#ifdef XMALLOC_POISON
	memset(ret, 0xA5, size);
#endif
	return ret;
}

/*
 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 * "data" to the allocated memory, zero terminates the allocated memory,
 * and returns a pointer to the allocated memory. If the allocation fails,
 * the program dies.
 */
static inline void *xmemdupz(const void *data, size_t len)
{
	char *p = xmalloc(len + 1);
	memcpy(p, data, len);
	p[len] = '\0';
	return p;
}

static inline char *xstrndup(const char *str, size_t len)
{
	char *p = memchr(str, '\0', len);
	return xmemdupz(str, p ? p - str : len);
}

static inline void *xrealloc(void *ptr, size_t size)
{
	void *ret = realloc(ptr, size);
	if (!ret && !size)
		ret = realloc(ptr, 1);
	if (!ret) {
		release_pack_memory(size, -1);
		ret = realloc(ptr, size);
		if (!ret && !size)
			ret = realloc(ptr, 1);
		if (!ret)
			die("Out of memory, realloc failed");
	}
	return ret;
}

static inline void *xcalloc(size_t nmemb, size_t size)
{
	void *ret = calloc(nmemb, size);
	if (!ret && (!nmemb || !size))
		ret = calloc(1, 1);
	if (!ret) {
		release_pack_memory(nmemb * size, -1);
		ret = calloc(nmemb, size);
		if (!ret && (!nmemb || !size))
			ret = calloc(1, 1);
		if (!ret)
			die("Out of memory, calloc failed");
	}
	return ret;
}

static inline void *xmmap(void *start, size_t length,
	int prot, int flags, int fd, off_t offset)
{
	void *ret = mmap(start, length, prot, flags, fd, offset);
	if (ret == MAP_FAILED) {
		if (!length)
			return NULL;
		release_pack_memory(length, fd);
		ret = mmap(start, length, prot, flags, fd, offset);
		if (ret == MAP_FAILED)
			die("Out of memory? mmap failed: %s", strerror(errno));
	}
	return ret;
}

/*
 * xread() is the same a read(), but it automatically restarts read()
 * operations with a recoverable error (EAGAIN and EINTR). xread()
 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 */
static inline ssize_t xread(int fd, void *buf, size_t len)
{
	ssize_t nr;
	while (1) {
		nr = read(fd, buf, len);
		if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
			continue;
		return nr;
	}
}

/*
 * xwrite() is the same a write(), but it automatically restarts write()
 * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 * GUARANTEE that "len" bytes is written even if the operation is successful.
 */
static inline ssize_t xwrite(int fd, const void *buf, size_t len)
{
	ssize_t nr;
	while (1) {
		nr = write(fd, buf, len);
		if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
			continue;
		return nr;
	}
}

static inline int xdup(int fd)
{
	int ret = dup(fd);
	if (ret < 0)
		die("dup failed: %s", strerror(errno));
	return ret;
}

static inline FILE *xfdopen(int fd, const char *mode)
{
	FILE *stream = fdopen(fd, mode);
	if (stream == NULL)
		die("Out of memory? fdopen failed: %s", strerror(errno));
	return stream;
}

static inline int xmkstemp(char *template)
{
	int fd;

	fd = mkstemp(template);
	if (fd < 0)
		die("Unable to create temporary file: %s", strerror(errno));
	return fd;
}

static inline size_t xsize_t(off_t len)
{
	return (size_t)len;
}

static inline int has_extension(const char *filename, const char *ext)
{
	size_t len = strlen(filename);
	size_t extlen = strlen(ext);
	return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
}

/* Sane ctype - no locale, and works with signed chars */
#undef isspace
#undef isdigit
#undef isalpha
#undef isalnum
#undef tolower
#undef toupper
extern unsigned char sane_ctype[256];
#define GIT_SPACE 0x01
#define GIT_DIGIT 0x02
#define GIT_ALPHA 0x04
#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
#define isspace(x) sane_istest(x,GIT_SPACE)
#define isdigit(x) sane_istest(x,GIT_DIGIT)
#define isalpha(x) sane_istest(x,GIT_ALPHA)
#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
#define tolower(x) sane_case((unsigned char)(x), 0x20)
#define toupper(x) sane_case((unsigned char)(x), 0)

static inline int sane_case(int x, int high)
{
	if (sane_istest(x, GIT_ALPHA))
		x = (x & ~0x20) | high;
	return x;
}

static inline int strtoul_ui(char const *s, int base, unsigned int *result)
{
	unsigned long ul;
	char *p;

	errno = 0;
	ul = strtoul(s, &p, base);
	if (errno || *p || p == s || (unsigned int) ul != ul)
		return -1;
	*result = ul;
	return 0;
}

static inline int strtol_i(char const *s, int base, int *result)
{
	long ul;
	char *p;

	errno = 0;
	ul = strtol(s, &p, base);
	if (errno || *p || p == s || (int) ul != ul)
		return -1;
	*result = ul;
	return 0;
}

#ifdef INTERNAL_QSORT
void git_qsort(void *base, size_t nmemb, size_t size,
	       int(*compar)(const void *, const void *));
#define qsort git_qsort
#endif

#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
# define FORCE_DIR_SET_GID S_ISGID
#else
# define FORCE_DIR_SET_GID 0
#endif

#endif
Commit	Line	Data
	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__) && !defined(__USLC__) && !defined(_M_UNIX)
	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 <fnmatch.h>
	67	#include <assert.h>
	68	#include <regex.h>
	69	#include <utime.h>
	70	#ifndef __MINGW32__
	71	#include <sys/wait.h>
	72	#include <sys/poll.h>
	73	#include <sys/socket.h>
	74	#include <sys/ioctl.h>
	75	#ifndef NO_SYS_SELECT_H
	76	#include <sys/select.h>
	77	#endif
	78	#include <netinet/in.h>
	79	#include <netinet/tcp.h>
	80	#include <arpa/inet.h>
	81	#include <netdb.h>
	82	#include <pwd.h>
	83	#include <inttypes.h>
	84	#if defined(__CYGWIN__)
	85	#undef _XOPEN_SOURCE
	86	#include <grp.h>
	87	#define _XOPEN_SOURCE 600
	88	#else
	89	#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
	90	#include <grp.h>
	91	#define _ALL_SOURCE 1
	92	#endif
	93	#else /* __MINGW32__ */
	94	/* pull in Windows compatibility stuff */
	95	#include "compat/mingw.h"
	96	#endif /* __MINGW32__ */
	97
	98	#ifndef NO_ICONV
	99	#include <iconv.h>
	100	#endif
	101
	102	/* On most systems <limits.h> would have given us this, but
	103	* not on some systems (e.g. GNU/Hurd).
	104	*/
	105	#ifndef PATH_MAX
	106	#define PATH_MAX 4096
	107	#endif
	108
	109	#ifndef PRIuMAX
	110	#define PRIuMAX "llu"
	111	#endif
	112
	113	#ifndef PATH_SEP
	114	#define PATH_SEP ':'
	115	#endif
	116
	117	#ifndef has_dos_drive_prefix
	118	#define has_dos_drive_prefix(path) 0
	119	#endif
	120
	121	#ifndef is_dir_sep
	122	#define is_dir_sep(c) ((c) == '/')
	123	#endif
	124
	125	#ifdef __GNUC__
	126	#define NORETURN __attribute__((__noreturn__))
	127	#else
	128	#define NORETURN
	129	#ifndef __attribute__
	130	#define __attribute__(x)
	131	#endif
	132	#endif
	133
	134	/* General helper functions */
	135	extern void usage(const char *err) NORETURN;
	136	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
	137	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
	138	extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
	139
	140	extern void set_usage_routine(void (routine)(const char err) NORETURN);
	141	extern void set_die_routine(void (routine)(const char err, va_list params) NORETURN);
	142	extern void set_error_routine(void (routine)(const char err, va_list params));
	143	extern void set_warn_routine(void (routine)(const char warn, va_list params));
	144
	145	extern int prefixcmp(const char str, const char prefix);
	146
	147	#ifdef NO_MMAP
	148
	149	#ifndef PROT_READ
	150	#define PROT_READ 1
	151	#define PROT_WRITE 2
	152	#define MAP_PRIVATE 1
	153	#define MAP_FAILED ((void*)-1)
	154	#endif
	155
	156	#define mmap git_mmap
	157	#define munmap git_munmap
	158	extern void git_mmap(void start, size_t length, int prot, int flags, int fd, off_t offset);
	159	extern int git_munmap(void *start, size_t length);
	160
	161	/* This value must be multiple of (pagesize * 2) */
	162	#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
	163
	164	#else /* NO_MMAP */
	165
	166	#include <sys/mman.h>
	167
	168	/* This value must be multiple of (pagesize * 2) */
	169	#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
	170	(sizeof(void*) >= 8 \
	171	? 1 * 1024 * 1024 * 1024 \
	172	: 32 * 1024 * 1024)
	173
	174	#endif /* NO_MMAP */
	175
	176	#define DEFAULT_PACKED_GIT_LIMIT \
	177	((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
	178
	179	#ifdef NO_PREAD
	180	#define pread git_pread
	181	extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
	182	#endif
	183
	184	#ifdef NO_SETENV
	185	#define setenv gitsetenv
	186	extern int gitsetenv(const char , const char , int);
	187	#endif
	188
	189	#ifdef NO_MKDTEMP
	190	#define mkdtemp gitmkdtemp
	191	extern char gitmkdtemp(char );
	192	#endif
	193
	194	#ifdef NO_UNSETENV
	195	#define unsetenv gitunsetenv
	196	extern void gitunsetenv(const char *);
	197	#endif
	198
	199	#ifdef NO_STRCASESTR
	200	#define strcasestr gitstrcasestr
	201	extern char gitstrcasestr(const char haystack, const char *needle);
	202	#endif
	203
	204	#ifdef NO_STRLCPY
	205	#define strlcpy gitstrlcpy
	206	extern size_t gitstrlcpy(char , const char , size_t);
	207	#endif
	208
	209	#ifdef NO_STRTOUMAX
	210	#define strtoumax gitstrtoumax
	211	extern uintmax_t gitstrtoumax(const char , char *, int);
	212	#endif
	213
	214	#ifdef NO_HSTRERROR
	215	#define hstrerror githstrerror
	216	extern const char *githstrerror(int herror);
	217	#endif
	218
	219	#ifdef NO_MEMMEM
	220	#define memmem gitmemmem
	221	void gitmemmem(const void haystack, size_t haystacklen,
	222	const void *needle, size_t needlelen);
	223	#endif
	224
	225	#ifdef FREAD_READS_DIRECTORIES
	226	#ifdef fopen
	227	#undef fopen
	228	#endif
	229	#define fopen(a,b) git_fopen(a,b)
	230	extern FILE git_fopen(const char, const char*);
	231	#endif
	232
	233	#ifdef SNPRINTF_RETURNS_BOGUS
	234	#define snprintf git_snprintf
	235	extern int git_snprintf(char *str, size_t maxsize,
	236	const char *format, ...);
	237	#define vsnprintf git_vsnprintf
	238	extern int git_vsnprintf(char *str, size_t maxsize,
	239	const char *format, va_list ap);
	240	#endif
	241
	242	#ifdef __GLIBC_PREREQ
	243	#if __GLIBC_PREREQ(2, 1)
	244	#define HAVE_STRCHRNUL
	245	#endif
	246	#endif
	247
	248	#ifndef HAVE_STRCHRNUL
	249	#define strchrnul gitstrchrnul
	250	static inline char gitstrchrnul(const char s, int c)
	251	{
	252	while (s && s != c)
	253	s++;
	254	return (char *)s;
	255	}
	256	#endif
	257
	258	extern void release_pack_memory(size_t, int);
	259
	260	static inline char* xstrdup(const char *str)
	261	{
	262	char *ret = strdup(str);
	263	if (!ret) {
	264	release_pack_memory(strlen(str) + 1, -1);
	265	ret = strdup(str);
	266	if (!ret)
	267	die("Out of memory, strdup failed");
	268	}
	269	return ret;
	270	}
	271
	272	static inline void *xmalloc(size_t size)
	273	{
	274	void *ret = malloc(size);
	275	if (!ret && !size)
	276	ret = malloc(1);
	277	if (!ret) {
	278	release_pack_memory(size, -1);
	279	ret = malloc(size);
	280	if (!ret && !size)
	281	ret = malloc(1);
	282	if (!ret)
	283	die("Out of memory, malloc failed");
	284	}
	285	#ifdef XMALLOC_POISON
	286	memset(ret, 0xA5, size);
	287	#endif
	288	return ret;
	289	}
	290
	291	/*
	292	* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
	293	* "data" to the allocated memory, zero terminates the allocated memory,
	294	* and returns a pointer to the allocated memory. If the allocation fails,
	295	* the program dies.
	296	*/
	297	static inline void xmemdupz(const void data, size_t len)
	298	{
	299	char *p = xmalloc(len + 1);
	300	memcpy(p, data, len);
	301	p[len] = '\0';
	302	return p;
	303	}
	304
	305	static inline char xstrndup(const char str, size_t len)
	306	{
	307	char *p = memchr(str, '\0', len);
	308	return xmemdupz(str, p ? p - str : len);
	309	}
	310
	311	static inline void xrealloc(void ptr, size_t size)
	312	{
	313	void *ret = realloc(ptr, size);
	314	if (!ret && !size)
	315	ret = realloc(ptr, 1);
	316	if (!ret) {
	317	release_pack_memory(size, -1);
	318	ret = realloc(ptr, size);
	319	if (!ret && !size)
	320	ret = realloc(ptr, 1);
	321	if (!ret)
	322	die("Out of memory, realloc failed");
	323	}
	324	return ret;
	325	}
	326
	327	static inline void *xcalloc(size_t nmemb, size_t size)
	328	{
	329	void *ret = calloc(nmemb, size);
	330	if (!ret && (!nmemb \|\| !size))
	331	ret = calloc(1, 1);
	332	if (!ret) {
	333	release_pack_memory(nmemb * size, -1);
	334	ret = calloc(nmemb, size);
	335	if (!ret && (!nmemb \|\| !size))
	336	ret = calloc(1, 1);
	337	if (!ret)
	338	die("Out of memory, calloc failed");
	339	}
	340	return ret;
	341	}
	342
	343	static inline void xmmap(void start, size_t length,
	344	int prot, int flags, int fd, off_t offset)
	345	{
	346	void *ret = mmap(start, length, prot, flags, fd, offset);
	347	if (ret == MAP_FAILED) {
	348	if (!length)
	349	return NULL;
	350	release_pack_memory(length, fd);
	351	ret = mmap(start, length, prot, flags, fd, offset);
	352	if (ret == MAP_FAILED)
	353	die("Out of memory? mmap failed: %s", strerror(errno));
	354	}
	355	return ret;
	356	}
	357
	358	/*
	359	* xread() is the same a read(), but it automatically restarts read()
	360	* operations with a recoverable error (EAGAIN and EINTR). xread()
	361	* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
	362	*/
	363	static inline ssize_t xread(int fd, void *buf, size_t len)
	364	{
	365	ssize_t nr;
	366	while (1) {
	367	nr = read(fd, buf, len);
	368	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	369	continue;
	370	return nr;
	371	}
	372	}
	373
	374	/*
	375	* xwrite() is the same a write(), but it automatically restarts write()
	376	* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
	377	* GUARANTEE that "len" bytes is written even if the operation is successful.
	378	*/
	379	static inline ssize_t xwrite(int fd, const void *buf, size_t len)
	380	{
	381	ssize_t nr;
	382	while (1) {
	383	nr = write(fd, buf, len);
	384	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	385	continue;
	386	return nr;
	387	}
	388	}
	389
	390	static inline int xdup(int fd)
	391	{
	392	int ret = dup(fd);
	393	if (ret < 0)
	394	die("dup failed: %s", strerror(errno));
	395	return ret;
	396	}
	397
	398	static inline FILE xfdopen(int fd, const char mode)
	399	{
	400	FILE *stream = fdopen(fd, mode);
	401	if (stream == NULL)
	402	die("Out of memory? fdopen failed: %s", strerror(errno));
	403	return stream;
	404	}
	405
	406	static inline int xmkstemp(char *template)
	407	{
	408	int fd;
	409
	410	fd = mkstemp(template);
	411	if (fd < 0)
	412	die("Unable to create temporary file: %s", strerror(errno));
	413	return fd;
	414	}
	415
	416	static inline size_t xsize_t(off_t len)
	417	{
	418	return (size_t)len;
	419	}
	420
	421	static inline int has_extension(const char filename, const char ext)
	422	{
	423	size_t len = strlen(filename);
	424	size_t extlen = strlen(ext);
	425	return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
	426	}
	427
	428	/* Sane ctype - no locale, and works with signed chars */
	429	#undef isspace
	430	#undef isdigit
	431	#undef isalpha
	432	#undef isalnum
	433	#undef tolower
	434	#undef toupper
	435	extern unsigned char sane_ctype[256];
	436	#define GIT_SPACE 0x01
	437	#define GIT_DIGIT 0x02
	438	#define GIT_ALPHA 0x04
	439	#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
	440	#define isspace(x) sane_istest(x,GIT_SPACE)
	441	#define isdigit(x) sane_istest(x,GIT_DIGIT)
	442	#define isalpha(x) sane_istest(x,GIT_ALPHA)
	443	#define isalnum(x) sane_istest(x,GIT_ALPHA \| GIT_DIGIT)
	444	#define tolower(x) sane_case((unsigned char)(x), 0x20)
	445	#define toupper(x) sane_case((unsigned char)(x), 0)
	446
	447	static inline int sane_case(int x, int high)
	448	{
	449	if (sane_istest(x, GIT_ALPHA))
	450	x = (x & ~0x20) \| high;
	451	return x;
	452	}
	453
	454	static inline int strtoul_ui(char const s, int base, unsigned int result)
	455	{
	456	unsigned long ul;
	457	char *p;
	458
	459	errno = 0;
	460	ul = strtoul(s, &p, base);
	461	if (errno \|\| *p \|\| p == s \|\| (unsigned int) ul != ul)
	462	return -1;
	463	*result = ul;
	464	return 0;
	465	}
	466
	467	static inline int strtol_i(char const s, int base, int result)
	468	{
	469	long ul;
	470	char *p;
	471
	472	errno = 0;
	473	ul = strtol(s, &p, base);
	474	if (errno \|\| *p \|\| p == s \|\| (int) ul != ul)
	475	return -1;
	476	*result = ul;
	477	return 0;
	478	}
	479
	480	#ifdef INTERNAL_QSORT
	481	void git_qsort(void *base, size_t nmemb, size_t size,
	482	int(compar)(const void , const void *));
	483	#define qsort git_qsort
	484	#endif
	485
	486	#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
	487	# define FORCE_DIR_SET_GID S_ISGID
	488	#else
	489	# define FORCE_DIR_SET_GID 0
	490	#endif
	491
	492	#endif