[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>
#ifndef NO_SYS_SELECT_H
#include <sys/select.h>
#endif
#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	70	#include <sys/ioctl.h>
2600973f	71	#ifndef NO_SYS_SELECT_H
80bbe72b	72	#include <sys/select.h>
2600973f	73	#endif
85023577 JH	74	#include <assert.h>
	75	#include <regex.h>
	76	#include <netinet/in.h>
	77	#include <netinet/tcp.h>
	78	#include <arpa/inet.h>
	79	#include <netdb.h>
	80	#include <pwd.h>
007e2ba6	81	#include <inttypes.h>
41b20017 RJ	82	#if defined(__CYGWIN__)
	83	#undef _XOPEN_SOURCE
	84	#include <grp.h>
	85	#define _XOPEN_SOURCE 600
	86	#else
fb952206	87	#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
85023577	88	#include <grp.h>
fb952206	89	#define _ALL_SOURCE 1
41b20017	90	#endif
85023577 JH	91
	92	#ifndef NO_ICONV
	93	#include <iconv.h>
	94	#endif
4050c0df	95
d0c2449f JH	96	/* On most systems <limits.h> would have given us this, but
	97	* not on some systems (e.g. GNU/Hurd).
	98	*/
	99	#ifndef PATH_MAX
	100	#define PATH_MAX 4096
	101	#endif
	102
c4001d92 SP	103	#ifndef PRIuMAX
	104	#define PRIuMAX "llu"
	105	#endif
	106
4050c0df JH	107	#ifdef __GNUC__
	108	#define NORETURN __attribute__((__noreturn__))
	109	#else
	110	#define NORETURN
	111	#ifndef __attribute__
	112	#define __attribute__(x)
	113	#endif
	114	#endif
	115
	116	/* General helper functions */
	117	extern void usage(const char *err) NORETURN;
	118	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
	119	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
46efd2d9	120	extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
4050c0df	121
39a3f5ea PB	122	extern void set_usage_routine(void (routine)(const char err) NORETURN);
	123	extern void set_die_routine(void (routine)(const char err, va_list params) NORETURN);
	124	extern void set_error_routine(void (routine)(const char err, va_list params));
fa39b6b5	125	extern void set_warn_routine(void (routine)(const char warn, va_list params));
39a3f5ea	126
698a68be JH	127	extern int prefixcmp(const char str, const char prefix);
698a68be JH	128
4050c0df JH	129	#ifdef NO_MMAP
	130
	131	#ifndef PROT_READ
	132	#define PROT_READ 1
	133	#define PROT_WRITE 2
	134	#define MAP_PRIVATE 1
	135	#define MAP_FAILED ((void*)-1)
	136	#endif
	137
d6779124 SP	138	#define mmap git_mmap
	139	#define munmap git_munmap
	140	extern void git_mmap(void start, size_t length, int prot, int flags, int fd, off_t offset);
	141	extern int git_munmap(void *start, size_t length);
4050c0df	142
5faaf246	143	/* This value must be multiple of (pagesize * 2) */
8c82534d SP	144	#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
8c82534d SP	145
4050c0df JH	146	#else /* NO_MMAP */
	147
	148	#include <sys/mman.h>
5faaf246 JH	149
5faaf246 JH	150	/* This value must be multiple of (pagesize * 2) */
22bac0ea SP	151	#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
	152	(sizeof(void*) >= 8 \
	153	? 1 * 1024 * 1024 * 1024 \
	154	: 32 * 1024 * 1024)
4050c0df JH	155
	156	#endif /* NO_MMAP */
	157
22bac0ea	158	#define DEFAULT_PACKED_GIT_LIMIT \
ecaebf4a	159	((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
8c82534d	160
6900679c SH	161	#ifdef NO_PREAD
	162	#define pread git_pread
	163	extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
	164	#endif
	165
4050c0df JH	166	#ifdef NO_SETENV
	167	#define setenv gitsetenv
	168	extern int gitsetenv(const char , const char , int);
	169	#endif
	170
ca5bb5d5 SP	171	#ifdef NO_MKDTEMP
	172	#define mkdtemp gitmkdtemp
	173	extern char gitmkdtemp(char );
	174	#endif
	175
731043fd JR	176	#ifdef NO_UNSETENV
	177	#define unsetenv gitunsetenv
	178	extern void gitunsetenv(const char *);
	179	#endif
	180
4050c0df JH	181	#ifdef NO_STRCASESTR
	182	#define strcasestr gitstrcasestr
	183	extern char gitstrcasestr(const char haystack, const char *needle);
	184	#endif
	185
817151e6 PE	186	#ifdef NO_STRLCPY
	187	#define strlcpy gitstrlcpy
	188	extern size_t gitstrlcpy(char , const char , size_t);
	189	#endif
	190
bc6b4f52 JR	191	#ifdef NO_STRTOUMAX
	192	#define strtoumax gitstrtoumax
	193	extern uintmax_t gitstrtoumax(const char , char *, int);
	194	#endif
	195
fa0c87c3 AR	196	#ifdef NO_HSTRERROR
	197	#define hstrerror githstrerror
	198	extern const char *githstrerror(int herror);
	199	#endif
	200
b21b9f1d RS	201	#ifdef NO_MEMMEM
	202	#define memmem gitmemmem
	203	void gitmemmem(const void haystack, size_t haystacklen,
	204	const void *needle, size_t needlelen);
	205	#endif
	206
726c8ef5 JS	207	#ifdef __GLIBC_PREREQ
	208	#if __GLIBC_PREREQ(2, 1)
	209	#define HAVE_STRCHRNUL
	210	#endif
	211	#endif
	212
	213	#ifndef HAVE_STRCHRNUL
659c69cf	214	#define strchrnul gitstrchrnul
9e79f00f AE	215	static inline char gitstrchrnul(const char s, int c)
	216	{
	217	while (s && s != c)
	218	s++;
	219	return (char *)s;
	220	}
659c69cf RS	221	#endif
659c69cf RS	222
d1efefa4	223	extern void release_pack_memory(size_t, int);
97bfeb34	224
9befac47 SP	225	static inline char* xstrdup(const char *str)
	226	{
	227	char *ret = strdup(str);
97bfeb34	228	if (!ret) {
d1efefa4	229	release_pack_memory(strlen(str) + 1, -1);
97bfeb34 SP	230	ret = strdup(str);
	231	if (!ret)
	232	die("Out of memory, strdup failed");
	233	}
9befac47 SP	234	return ret;
	235	}
	236
4050c0df JH	237	static inline void *xmalloc(size_t size)
	238	{
	239	void *ret = malloc(size);
4e7a2ecc JH	240	if (!ret && !size)
4e7a2ecc JH	241	ret = malloc(1);
97bfeb34	242	if (!ret) {
d1efefa4	243	release_pack_memory(size, -1);
97bfeb34 SP	244	ret = malloc(size);
	245	if (!ret && !size)
	246	ret = malloc(1);
	247	if (!ret)
	248	die("Out of memory, malloc failed");
	249	}
aa5481c1 JH	250	#ifdef XMALLOC_POISON
	251	memset(ret, 0xA5, size);
	252	#endif
4050c0df JH	253	return ret;
	254	}
	255
68d3025a	256	static inline void xmemdupz(const void data, size_t len)
5094102e	257	{
68d3025a PH	258	char *p = xmalloc(len + 1);
68d3025a PH	259	memcpy(p, data, len);
5094102e DB	260	p[len] = '\0';
	261	return p;
	262	}
	263
68d3025a PH	264	static inline char xstrndup(const char str, size_t len)
	265	{
	266	char *p = memchr(str, '\0', len);
	267	return xmemdupz(str, p ? p - str : len);
	268	}
	269
4050c0df JH	270	static inline void xrealloc(void ptr, size_t size)
	271	{
	272	void *ret = realloc(ptr, size);
4e7a2ecc JH	273	if (!ret && !size)
4e7a2ecc JH	274	ret = realloc(ptr, 1);
97bfeb34	275	if (!ret) {
d1efefa4	276	release_pack_memory(size, -1);
97bfeb34 SP	277	ret = realloc(ptr, size);
	278	if (!ret && !size)
	279	ret = realloc(ptr, 1);
	280	if (!ret)
	281	die("Out of memory, realloc failed");
	282	}
4050c0df JH	283	return ret;
	284	}
	285
	286	static inline void *xcalloc(size_t nmemb, size_t size)
	287	{
	288	void *ret = calloc(nmemb, size);
4e7a2ecc JH	289	if (!ret && (!nmemb \|\| !size))
4e7a2ecc JH	290	ret = calloc(1, 1);
97bfeb34	291	if (!ret) {
d1efefa4	292	release_pack_memory(nmemb * size, -1);
97bfeb34 SP	293	ret = calloc(nmemb, size);
	294	if (!ret && (!nmemb \|\| !size))
	295	ret = calloc(1, 1);
	296	if (!ret)
	297	die("Out of memory, calloc failed");
	298	}
4050c0df JH	299	return ret;
	300	}
	301
c4712e45 SP	302	static inline void xmmap(void start, size_t length,
	303	int prot, int flags, int fd, off_t offset)
	304	{
	305	void *ret = mmap(start, length, prot, flags, fd, offset);
	306	if (ret == MAP_FAILED) {
9130ac1e LT	307	if (!length)
9130ac1e LT	308	return NULL;
d1efefa4	309	release_pack_memory(length, fd);
c4712e45 SP	310	ret = mmap(start, length, prot, flags, fd, offset);
	311	if (ret == MAP_FAILED)
	312	die("Out of memory? mmap failed: %s", strerror(errno));
	313	}
	314	return ret;
	315	}
	316
1c15afb9 JH	317	static inline ssize_t xread(int fd, void *buf, size_t len)
	318	{
	319	ssize_t nr;
	320	while (1) {
	321	nr = read(fd, buf, len);
	322	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	323	continue;
	324	return nr;
	325	}
	326	}
	327
	328	static inline ssize_t xwrite(int fd, const void *buf, size_t len)
	329	{
	330	ssize_t nr;
	331	while (1) {
	332	nr = write(fd, buf, len);
	333	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	334	continue;
	335	return nr;
	336	}
	337	}
	338
f5788250 JM	339	static inline int xdup(int fd)
	340	{
	341	int ret = dup(fd);
	342	if (ret < 0)
	343	die("dup failed: %s", strerror(errno));
	344	return ret;
	345	}
	346
	347	static inline FILE xfdopen(int fd, const char mode)
	348	{
	349	FILE *stream = fdopen(fd, mode);
	350	if (stream == NULL)
	351	die("Out of memory? fdopen failed: %s", strerror(errno));
	352	return stream;
	353	}
	354
f21a47b2 LFC	355	static inline int xmkstemp(char *template)
	356	{
	357	int fd;
	358
	359	fd = mkstemp(template);
	360	if (fd < 0)
	361	die("Unable to create temporary file: %s", strerror(errno));
	362	return fd;
	363	}
	364
dc49cd76 SP	365	static inline size_t xsize_t(off_t len)
	366	{
	367	return (size_t)len;
	368	}
	369
5bb1cda5	370	static inline int has_extension(const char filename, const char ext)
83a2b841	371	{
5bb1cda5 RS	372	size_t len = strlen(filename);
5bb1cda5 RS	373	size_t extlen = strlen(ext);
83a2b841 RS	374	return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
	375	}
	376
4050c0df JH	377	/* Sane ctype - no locale, and works with signed chars */
	378	#undef isspace
	379	#undef isdigit
	380	#undef isalpha
	381	#undef isalnum
	382	#undef tolower
	383	#undef toupper
	384	extern unsigned char sane_ctype[256];
	385	#define GIT_SPACE 0x01
	386	#define GIT_DIGIT 0x02
	387	#define GIT_ALPHA 0x04
	388	#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
	389	#define isspace(x) sane_istest(x,GIT_SPACE)
	390	#define isdigit(x) sane_istest(x,GIT_DIGIT)
	391	#define isalpha(x) sane_istest(x,GIT_ALPHA)
	392	#define isalnum(x) sane_istest(x,GIT_ALPHA \| GIT_DIGIT)
	393	#define tolower(x) sane_case((unsigned char)(x), 0x20)
	394	#define toupper(x) sane_case((unsigned char)(x), 0)
	395
	396	static inline int sane_case(int x, int high)
	397	{
	398	if (sane_istest(x, GIT_ALPHA))
	399	x = (x & ~0x20) \| high;
	400	return x;
	401	}
	402
6aead43d JM	403	static inline int strtoul_ui(char const s, int base, unsigned int result)
	404	{
	405	unsigned long ul;
	406	char *p;
	407
	408	errno = 0;
	409	ul = strtoul(s, &p, base);
	410	if (errno \|\| *p \|\| p == s \|\| (unsigned int) ul != ul)
	411	return -1;
	412	*result = ul;
	413	return 0;
	414	}
	415
7791ecbc JH	416	static inline int strtol_i(char const s, int base, int result)
	417	{
	418	long ul;
	419	char *p;
	420
	421	errno = 0;
	422	ul = strtol(s, &p, base);
	423	if (errno \|\| *p \|\| p == s \|\| (int) ul != ul)
	424	return -1;
	425	*result = ul;
	426	return 0;
	427	}
	428
4050c0df	429	#endif