[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__)
#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 <sys/wait.h>
#include <fnmatch.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <assert.h>
#include <regex.h>
#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

#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

#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 __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;
}

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;
}

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;
	}
}

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;
}

#endif
Commit	Line	Data
4050c0df JH	1	#ifndef GIT_COMPAT_UTIL_H
	2	#define GIT_COMPAT_UTIL_H
	3
b97e9116 MW	4	#define _FILE_OFFSET_BITS 64
b97e9116 MW	5
8f1d2e6f	6	#ifndef FLEX_ARRAY
8e973991 JH	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
8f1d2e6f JH	25	#endif
	26	#endif
	27
b4f2a6ac JH	28	#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
b4f2a6ac JH	29
8723f216 NP	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))))
db7244bd	37	#define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
8723f216	38
cf606e3d AW	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
95ca1c6c	42	#if !defined(__APPLE__) && !defined(__FreeBSD__)
85023577 JH	43	#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
85023577 JH	44	#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
c902c9a6	45	#endif
fb952206 JR	46	#define _ALL_SOURCE 1
	47	#define _GNU_SOURCE 1
	48	#define _BSD_SOURCE 1
85023577	49
4050c0df JH	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>
4050c0df JH	61	#include <sys/types.h>
4050c0df JH	62	#include <dirent.h>
85023577 JH	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>
80bbe72b JS	70	#include <sys/ioctl.h>
80bbe72b JS	71	#include <sys/select.h>
85023577 JH	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>
007e2ba6	79	#include <inttypes.h>
41b20017 RJ	80	#if defined(__CYGWIN__)
	81	#undef _XOPEN_SOURCE
	82	#include <grp.h>
	83	#define _XOPEN_SOURCE 600
	84	#else
fb952206	85	#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
85023577	86	#include <grp.h>
fb952206	87	#define _ALL_SOURCE 1
41b20017	88	#endif
85023577 JH	89
	90	#ifndef NO_ICONV
	91	#include <iconv.h>
	92	#endif
4050c0df	93
d0c2449f JH	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
c4001d92 SP	101	#ifndef PRIuMAX
	102	#define PRIuMAX "llu"
	103	#endif
	104
4050c0df JH	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 */
	115	extern void usage(const char *err) NORETURN;
	116	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
	117	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
46efd2d9	118	extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
4050c0df	119
39a3f5ea PB	120	extern void set_usage_routine(void (routine)(const char err) NORETURN);
	121	extern void set_die_routine(void (routine)(const char err, va_list params) NORETURN);
	122	extern void set_error_routine(void (routine)(const char err, va_list params));
fa39b6b5	123	extern void set_warn_routine(void (routine)(const char warn, va_list params));
39a3f5ea	124
698a68be JH	125	extern int prefixcmp(const char str, const char prefix);
698a68be JH	126
4050c0df JH	127	#ifdef NO_MMAP
	128
	129	#ifndef PROT_READ
	130	#define PROT_READ 1
	131	#define PROT_WRITE 2
	132	#define MAP_PRIVATE 1
	133	#define MAP_FAILED ((void*)-1)
	134	#endif
	135
d6779124 SP	136	#define mmap git_mmap
	137	#define munmap git_munmap
	138	extern void git_mmap(void start, size_t length, int prot, int flags, int fd, off_t offset);
	139	extern int git_munmap(void *start, size_t length);
4050c0df	140
5faaf246	141	/* This value must be multiple of (pagesize * 2) */
8c82534d SP	142	#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
8c82534d SP	143
4050c0df JH	144	#else /* NO_MMAP */
	145
	146	#include <sys/mman.h>
5faaf246 JH	147
5faaf246 JH	148	/* This value must be multiple of (pagesize * 2) */
22bac0ea SP	149	#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
	150	(sizeof(void*) >= 8 \
	151	? 1 * 1024 * 1024 * 1024 \
	152	: 32 * 1024 * 1024)
4050c0df JH	153
	154	#endif /* NO_MMAP */
	155
22bac0ea	156	#define DEFAULT_PACKED_GIT_LIMIT \
ecaebf4a	157	((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
8c82534d	158
6900679c SH	159	#ifdef NO_PREAD
	160	#define pread git_pread
	161	extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
	162	#endif
	163
4050c0df JH	164	#ifdef NO_SETENV
	165	#define setenv gitsetenv
	166	extern int gitsetenv(const char , const char , int);
	167	#endif
	168
ca5bb5d5 SP	169	#ifdef NO_MKDTEMP
	170	#define mkdtemp gitmkdtemp
	171	extern char gitmkdtemp(char );
	172	#endif
	173
731043fd JR	174	#ifdef NO_UNSETENV
	175	#define unsetenv gitunsetenv
	176	extern void gitunsetenv(const char *);
	177	#endif
	178
4050c0df JH	179	#ifdef NO_STRCASESTR
	180	#define strcasestr gitstrcasestr
	181	extern char gitstrcasestr(const char haystack, const char *needle);
	182	#endif
	183
817151e6 PE	184	#ifdef NO_STRLCPY
	185	#define strlcpy gitstrlcpy
	186	extern size_t gitstrlcpy(char , const char , size_t);
	187	#endif
	188
bc6b4f52 JR	189	#ifdef NO_STRTOUMAX
	190	#define strtoumax gitstrtoumax
	191	extern uintmax_t gitstrtoumax(const char , char *, int);
	192	#endif
	193
fa0c87c3 AR	194	#ifdef NO_HSTRERROR
	195	#define hstrerror githstrerror
	196	extern const char *githstrerror(int herror);
	197	#endif
	198
b21b9f1d RS	199	#ifdef NO_MEMMEM
	200	#define memmem gitmemmem
	201	void gitmemmem(const void haystack, size_t haystacklen,
	202	const void *needle, size_t needlelen);
	203	#endif
	204
726c8ef5 JS	205	#ifdef __GLIBC_PREREQ
	206	#if __GLIBC_PREREQ(2, 1)
	207	#define HAVE_STRCHRNUL
	208	#endif
	209	#endif
	210
	211	#ifndef HAVE_STRCHRNUL
659c69cf	212	#define strchrnul gitstrchrnul
9e79f00f AE	213	static inline char gitstrchrnul(const char s, int c)
	214	{
	215	while (s && s != c)
	216	s++;
	217	return (char *)s;
	218	}
659c69cf RS	219	#endif
659c69cf RS	220
d1efefa4	221	extern void release_pack_memory(size_t, int);
97bfeb34	222
9befac47 SP	223	static inline char* xstrdup(const char *str)
	224	{
	225	char *ret = strdup(str);
97bfeb34	226	if (!ret) {
d1efefa4	227	release_pack_memory(strlen(str) + 1, -1);
97bfeb34 SP	228	ret = strdup(str);
	229	if (!ret)
	230	die("Out of memory, strdup failed");
	231	}
9befac47 SP	232	return ret;
	233	}
	234
4050c0df JH	235	static inline void *xmalloc(size_t size)
	236	{
	237	void *ret = malloc(size);
4e7a2ecc JH	238	if (!ret && !size)
4e7a2ecc JH	239	ret = malloc(1);
97bfeb34	240	if (!ret) {
d1efefa4	241	release_pack_memory(size, -1);
97bfeb34 SP	242	ret = malloc(size);
	243	if (!ret && !size)
	244	ret = malloc(1);
	245	if (!ret)
	246	die("Out of memory, malloc failed");
	247	}
aa5481c1 JH	248	#ifdef XMALLOC_POISON
	249	memset(ret, 0xA5, size);
	250	#endif
4050c0df JH	251	return ret;
	252	}
	253
68d3025a	254	static inline void xmemdupz(const void data, size_t len)
5094102e	255	{
68d3025a PH	256	char *p = xmalloc(len + 1);
68d3025a PH	257	memcpy(p, data, len);
5094102e DB	258	p[len] = '\0';
	259	return p;
	260	}
	261
68d3025a PH	262	static inline char xstrndup(const char str, size_t len)
	263	{
	264	char *p = memchr(str, '\0', len);
	265	return xmemdupz(str, p ? p - str : len);
	266	}
	267
4050c0df JH	268	static inline void xrealloc(void ptr, size_t size)
	269	{
	270	void *ret = realloc(ptr, size);
4e7a2ecc JH	271	if (!ret && !size)
4e7a2ecc JH	272	ret = realloc(ptr, 1);
97bfeb34	273	if (!ret) {
d1efefa4	274	release_pack_memory(size, -1);
97bfeb34 SP	275	ret = realloc(ptr, size);
	276	if (!ret && !size)
	277	ret = realloc(ptr, 1);
	278	if (!ret)
	279	die("Out of memory, realloc failed");
	280	}
4050c0df JH	281	return ret;
	282	}
	283
	284	static inline void *xcalloc(size_t nmemb, size_t size)
	285	{
	286	void *ret = calloc(nmemb, size);
4e7a2ecc JH	287	if (!ret && (!nmemb \|\| !size))
4e7a2ecc JH	288	ret = calloc(1, 1);
97bfeb34	289	if (!ret) {
d1efefa4	290	release_pack_memory(nmemb * size, -1);
97bfeb34 SP	291	ret = calloc(nmemb, size);
	292	if (!ret && (!nmemb \|\| !size))
	293	ret = calloc(1, 1);
	294	if (!ret)
	295	die("Out of memory, calloc failed");
	296	}
4050c0df JH	297	return ret;
	298	}
	299
c4712e45 SP	300	static inline void xmmap(void start, size_t length,
	301	int prot, int flags, int fd, off_t offset)
	302	{
	303	void *ret = mmap(start, length, prot, flags, fd, offset);
	304	if (ret == MAP_FAILED) {
9130ac1e LT	305	if (!length)
9130ac1e LT	306	return NULL;
d1efefa4	307	release_pack_memory(length, fd);
c4712e45 SP	308	ret = mmap(start, length, prot, flags, fd, offset);
	309	if (ret == MAP_FAILED)
	310	die("Out of memory? mmap failed: %s", strerror(errno));
	311	}
	312	return ret;
	313	}
	314
1c15afb9 JH	315	static inline ssize_t xread(int fd, void *buf, size_t len)
	316	{
	317	ssize_t nr;
	318	while (1) {
	319	nr = read(fd, buf, len);
	320	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	321	continue;
	322	return nr;
	323	}
	324	}
	325
	326	static inline ssize_t xwrite(int fd, const void *buf, size_t len)
	327	{
	328	ssize_t nr;
	329	while (1) {
	330	nr = write(fd, buf, len);
	331	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	332	continue;
	333	return nr;
	334	}
	335	}
	336
f5788250 JM	337	static inline int xdup(int fd)
	338	{
	339	int ret = dup(fd);
	340	if (ret < 0)
	341	die("dup failed: %s", strerror(errno));
	342	return ret;
	343	}
	344
	345	static inline FILE xfdopen(int fd, const char mode)
	346	{
	347	FILE *stream = fdopen(fd, mode);
	348	if (stream == NULL)
	349	die("Out of memory? fdopen failed: %s", strerror(errno));
	350	return stream;
	351	}
	352
f21a47b2 LFC	353	static inline int xmkstemp(char *template)
	354	{
	355	int fd;
	356
	357	fd = mkstemp(template);
	358	if (fd < 0)
	359	die("Unable to create temporary file: %s", strerror(errno));
	360	return fd;
	361	}
	362
dc49cd76 SP	363	static inline size_t xsize_t(off_t len)
	364	{
	365	return (size_t)len;
	366	}
	367
5bb1cda5	368	static inline int has_extension(const char filename, const char ext)
83a2b841	369	{
5bb1cda5 RS	370	size_t len = strlen(filename);
5bb1cda5 RS	371	size_t extlen = strlen(ext);
83a2b841 RS	372	return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
	373	}
	374
4050c0df JH	375	/* Sane ctype - no locale, and works with signed chars */
	376	#undef isspace
	377	#undef isdigit
	378	#undef isalpha
	379	#undef isalnum
	380	#undef tolower
	381	#undef toupper
	382	extern unsigned char sane_ctype[256];
	383	#define GIT_SPACE 0x01
	384	#define GIT_DIGIT 0x02
	385	#define GIT_ALPHA 0x04
	386	#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
	387	#define isspace(x) sane_istest(x,GIT_SPACE)
	388	#define isdigit(x) sane_istest(x,GIT_DIGIT)
	389	#define isalpha(x) sane_istest(x,GIT_ALPHA)
	390	#define isalnum(x) sane_istest(x,GIT_ALPHA \| GIT_DIGIT)
	391	#define tolower(x) sane_case((unsigned char)(x), 0x20)
	392	#define toupper(x) sane_case((unsigned char)(x), 0)
	393
	394	static inline int sane_case(int x, int high)
	395	{
	396	if (sane_istest(x, GIT_ALPHA))
	397	x = (x & ~0x20) \| high;
	398	return x;
	399	}
	400
6aead43d JM	401	static inline int strtoul_ui(char const s, int base, unsigned int result)
	402	{
	403	unsigned long ul;
	404	char *p;
	405
	406	errno = 0;
	407	ul = strtoul(s, &p, base);
	408	if (errno \|\| *p \|\| p == s \|\| (unsigned int) ul != ul)
	409	return -1;
	410	*result = ul;
	411	return 0;
	412	}
	413
7791ecbc JH	414	static inline int strtol_i(char const s, int base, int result)
	415	{
	416	long ul;
	417	char *p;
	418
	419	errno = 0;
	420	ul = strtol(s, &p, base);
	421	if (errno \|\| *p \|\| p == s \|\| (int) ul != ul)
	422	return -1;
	423	*result = ul;
	424	return 0;
	425	}
	426
4050c0df	427	#endif