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

#ifndef GIT_COMPAT_UTIL_H
#define GIT_COMPAT_UTIL_H

#ifndef FLEX_ARRAY
#if defined(__GNUC__) && (__GNUC__ < 3)
#define FLEX_ARRAY 0
#else
#define FLEX_ARRAY /* empty */
#endif
#endif

#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 <netinet/in.h>
#include <sys/types.h>
#include <dirent.h>

#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)));

#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 gitfakemmap
#define munmap gitfakemunmap
extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
extern int gitfakemunmap(void *start, size_t length);

#else /* NO_MMAP */

#include <sys/mman.h>

#endif /* NO_MMAP */

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

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

static inline void *xmalloc(size_t size)
{
	void *ret = malloc(size);
	if (!ret && !size)
		ret = malloc(1);
	if (!ret)
		die("Out of memory, malloc failed");
	return ret;
}

static inline void *xrealloc(void *ptr, size_t size)
{
	void *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)
		die("Out of memory, calloc failed");
	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;
	}
}

/* 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;
}

#ifndef MAXPATHLEN
#define MAXPATHLEN 256
#endif
#endif
Commit	Line	Data
4050c0df JH	1	#ifndef GIT_COMPAT_UTIL_H
	2	#define GIT_COMPAT_UTIL_H
	3
8f1d2e6f JH	4	#ifndef FLEX_ARRAY
	5	#if defined(__GNUC__) && (__GNUC__ < 3)
	6	#define FLEX_ARRAY 0
	7	#else
	8	#define FLEX_ARRAY /* empty */
	9	#endif
	10	#endif
	11
4050c0df JH	12	#include <unistd.h>
	13	#include <stdio.h>
	14	#include <sys/stat.h>
	15	#include <fcntl.h>
	16	#include <stddef.h>
	17	#include <stdlib.h>
	18	#include <stdarg.h>
	19	#include <string.h>
	20	#include <errno.h>
	21	#include <limits.h>
	22	#include <sys/param.h>
	23	#include <netinet/in.h>
	24	#include <sys/types.h>
	25	#include <dirent.h>
	26
	27	#ifdef __GNUC__
	28	#define NORETURN __attribute__((__noreturn__))
	29	#else
	30	#define NORETURN
	31	#ifndef __attribute__
	32	#define __attribute__(x)
	33	#endif
	34	#endif
	35
	36	/* General helper functions */
	37	extern void usage(const char *err) NORETURN;
	38	extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
	39	extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
	40
	41	#ifdef NO_MMAP
	42
	43	#ifndef PROT_READ
	44	#define PROT_READ 1
	45	#define PROT_WRITE 2
	46	#define MAP_PRIVATE 1
	47	#define MAP_FAILED ((void*)-1)
	48	#endif
	49
	50	#define mmap gitfakemmap
	51	#define munmap gitfakemunmap
	52	extern void gitfakemmap(void start, size_t length, int prot , int flags, int fd, off_t offset);
	53	extern int gitfakemunmap(void *start, size_t length);
	54
	55	#else /* NO_MMAP */
	56
	57	#include <sys/mman.h>
	58
	59	#endif /* NO_MMAP */
	60
	61	#ifdef NO_SETENV
	62	#define setenv gitsetenv
	63	extern int gitsetenv(const char , const char , int);
	64	#endif
	65
	66	#ifdef NO_STRCASESTR
	67	#define strcasestr gitstrcasestr
	68	extern char gitstrcasestr(const char haystack, const char *needle);
	69	#endif
	70
	71	static inline void *xmalloc(size_t size)
	72	{
	73	void *ret = malloc(size);
4e7a2ecc JH	74	if (!ret && !size)
4e7a2ecc JH	75	ret = malloc(1);
4050c0df JH	76	if (!ret)
	77	die("Out of memory, malloc failed");
	78	return ret;
	79	}
	80
	81	static inline void xrealloc(void ptr, size_t size)
	82	{
	83	void *ret = realloc(ptr, size);
4e7a2ecc JH	84	if (!ret && !size)
4e7a2ecc JH	85	ret = realloc(ptr, 1);
4050c0df JH	86	if (!ret)
	87	die("Out of memory, realloc failed");
	88	return ret;
	89	}
	90
	91	static inline void *xcalloc(size_t nmemb, size_t size)
	92	{
	93	void *ret = calloc(nmemb, size);
4e7a2ecc JH	94	if (!ret && (!nmemb \|\| !size))
4e7a2ecc JH	95	ret = calloc(1, 1);
4050c0df JH	96	if (!ret)
	97	die("Out of memory, calloc failed");
	98	return ret;
	99	}
	100
1c15afb9 JH	101	static inline ssize_t xread(int fd, void *buf, size_t len)
	102	{
	103	ssize_t nr;
	104	while (1) {
	105	nr = read(fd, buf, len);
	106	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	107	continue;
	108	return nr;
	109	}
	110	}
	111
	112	static inline ssize_t xwrite(int fd, const void *buf, size_t len)
	113	{
	114	ssize_t nr;
	115	while (1) {
	116	nr = write(fd, buf, len);
	117	if ((nr < 0) && (errno == EAGAIN \|\| errno == EINTR))
	118	continue;
	119	return nr;
	120	}
	121	}
	122
4050c0df JH	123	/* Sane ctype - no locale, and works with signed chars */
	124	#undef isspace
	125	#undef isdigit
	126	#undef isalpha
	127	#undef isalnum
	128	#undef tolower
	129	#undef toupper
	130	extern unsigned char sane_ctype[256];
	131	#define GIT_SPACE 0x01
	132	#define GIT_DIGIT 0x02
	133	#define GIT_ALPHA 0x04
	134	#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
	135	#define isspace(x) sane_istest(x,GIT_SPACE)
	136	#define isdigit(x) sane_istest(x,GIT_DIGIT)
	137	#define isalpha(x) sane_istest(x,GIT_ALPHA)
	138	#define isalnum(x) sane_istest(x,GIT_ALPHA \| GIT_DIGIT)
	139	#define tolower(x) sane_case((unsigned char)(x), 0x20)
	140	#define toupper(x) sane_case((unsigned char)(x), 0)
	141
	142	static inline int sane_case(int x, int high)
	143	{
	144	if (sane_istest(x, GIT_ALPHA))
	145	x = (x & ~0x20) \| high;
	146	return x;
	147	}
	148
252fef71 MA	149	#ifndef MAXPATHLEN
	150	#define MAXPATHLEN 256
	151	#endif
4050c0df	152	#endif