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Diffstat (limited to 'libblkid/c.h')
| -rw-r--r-- | libblkid/c.h | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/libblkid/c.h b/libblkid/c.h new file mode 100644 index 000000000..037a09928 --- /dev/null +++ b/libblkid/c.h @@ -0,0 +1,280 @@ +/* + * Fundamental C definitions. + */ + +#ifndef UTIL_LINUX_C_H +#define UTIL_LINUX_C_H + +#include <limits.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <unistd.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include "blkid.h" +#ifdef HAVE_ERR_H +# include <err.h> +#endif + +#ifndef HAVE_USLEEP +# include <time.h> +#endif + +/* + * Compiler specific stuff + */ +#ifndef __GNUC_PREREQ +# if defined __GNUC__ && defined __GNUC_MINOR__ +# define __GNUC_PREREQ(maj, min) \ + ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) +# else +# define __GNUC_PREREQ(maj, min) 0 +# endif +#endif + +#ifdef __GNUC__ + +/* &a[0] degrades to a pointer: a different type from an array */ +# define __must_be_array(a) \ + UL_BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(__typeof__(a), __typeof__(&a[0]))) + +# define ignore_result(x) ({ \ + __typeof__(x) __dummy __attribute__((__unused__)) = (x); (void) __dummy; \ +}) + +#else /* !__GNUC__ */ +# define __must_be_array(a) 0 +# define __attribute__(_arg_) +# define ignore_result(x) ((void) (x)) +#endif /* !__GNUC__ */ + +/* + * Function attributes + */ +#ifndef __ul_alloc_size +# if __GNUC_PREREQ (4, 3) +# define __ul_alloc_size(s) __attribute__((alloc_size(s))) +# else +# define __ul_alloc_size(s) +# endif +#endif + +#ifndef __ul_calloc_size +# if __GNUC_PREREQ (4, 3) +# define __ul_calloc_size(n, s) __attribute__((alloc_size(n, s))) +# else +# define __ul_calloc_size(n, s) +# endif +#endif + +/* Force a compilation error if condition is true, but also produce a + * result (of value 0 and type size_t), so the expression can be used + * e.g. in a structure initializer (or where-ever else comma expressions + * aren't permitted). + */ +#define UL_BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); })) +#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); })) + +#ifndef ARRAY_SIZE +# define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) +#endif + +#ifndef PATH_MAX +# define PATH_MAX 4096 +#endif + +#ifndef TRUE +# define TRUE 1 +#endif + +#ifndef FALSE +# define FALSE 0 +#endif + +#ifndef min +# define min(x, y) ({ \ + __typeof__(x) _min1 = (x); \ + __typeof__(y) _min2 = (y); \ + (void) (&_min1 == &_min2); \ + _min1 < _min2 ? _min1 : _min2; }) +#endif + +#ifndef max +# define max(x, y) ({ \ + __typeof__(x) _max1 = (x); \ + __typeof__(y) _max2 = (y); \ + (void) (&_max1 == &_max2); \ + _max1 > _max2 ? _max1 : _max2; }) +#endif + +#ifndef offsetof +#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) +#endif + +#ifndef container_of +#define container_of(ptr, type, member) ({ \ + const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) );}) +#endif + +#ifndef HAVE_PROGRAM_INVOCATION_SHORT_NAME +# ifdef HAVE___PROGNAME +extern char *__progname; +# define program_invocation_short_name __progname +# else +# ifdef HAVE_GETEXECNAME +# define program_invocation_short_name \ + prog_inv_sh_nm_from_file(getexecname(), 0) +# else +# define program_invocation_short_name \ + prog_inv_sh_nm_from_file(__FILE__, 1) +# endif +static char prog_inv_sh_nm_buf[256]; +static inline char * +prog_inv_sh_nm_from_file(char *f, char stripext) +{ + char *t; + + if ((t = strrchr(f, '/')) != NULL) + t++; + else + t = f; + + strncpy(prog_inv_sh_nm_buf, t, sizeof(prog_inv_sh_nm_buf) - 1); + prog_inv_sh_nm_buf[sizeof(prog_inv_sh_nm_buf) - 1] = '\0'; + + if (stripext && (t = strrchr(prog_inv_sh_nm_buf, '.')) != NULL) + *t = '\0'; + + return prog_inv_sh_nm_buf; +} +# endif +#endif + + +#ifndef HAVE_ERR_H +static inline void +errmsg(char doexit, int excode, char adderr, const char *fmt, ...) +{ + fprintf(stderr, "%s: ", program_invocation_short_name); + if (fmt != NULL) { + va_list argp; + va_start(argp, fmt); + vfprintf(stderr, fmt, argp); + va_end(argp); + if (adderr) + fprintf(stderr, ": "); + } + if (adderr) + fprintf(stderr, "%m"); + fprintf(stderr, "\n"); + if (doexit) + exit(excode); +} + +#ifndef HAVE_ERR +# define err(E, FMT...) errmsg(1, E, 1, FMT) +#endif + +#ifndef HAVE_ERRX +# define errx(E, FMT...) errmsg(1, E, 0, FMT) +#endif + +#ifndef HAVE_WARN +# define warn(FMT...) errmsg(0, 0, 1, FMT) +#endif + +#ifndef HAVE_WARNX +# define warnx(FMT...) errmsg(0, 0, 0, FMT) +#endif +#endif /* !HAVE_ERR_H */ + + +static inline __attribute__((const)) int is_power_of_2(unsigned long num) +{ + return (num != 0 && ((num & (num - 1)) == 0)); +} + +#ifndef HAVE_LOFF_T +typedef int64_t loff_t; +#endif + +#if !defined(HAVE_DIRFD) && (!defined(HAVE_DECL_DIRFD) || HAVE_DECL_DIRFD == 0) && defined(HAVE_DIR_DD_FD) +#include <sys/types.h> +#include <dirent.h> +static inline int dirfd(DIR *d) +{ + return d->dd_fd; +} +#endif + +/* + * Fallback defines for old versions of glibc + */ +#include <fcntl.h> +#ifndef O_CLOEXEC +#define O_CLOEXEC 0 +#endif + +#ifndef AI_ADDRCONFIG +#define AI_ADDRCONFIG 0x0020 +#endif + +#ifndef IUTF8 +#define IUTF8 0040000 +#endif + +/* + * MAXHOSTNAMELEN replacement + */ +static inline size_t get_hostname_max(void) +{ + long len = sysconf(_SC_HOST_NAME_MAX); + + if (0 < len) + return len; + +#ifdef MAXHOSTNAMELEN + return MAXHOSTNAMELEN; +#elif HOST_NAME_MAX + return HOST_NAME_MAX; +#endif + return 64; +} + +/* + * Constant strings for usage() functions. For more info see + * Documentation/howto-usage-function.txt and sys-utils/arch.c + */ +#define USAGE_HEADER _("\nUsage:\n") +#define USAGE_OPTIONS _("\nOptions:\n") +#define USAGE_SEPARATOR _("\n") +#define USAGE_HELP _(" -h, --help display this help and exit\n") +#define USAGE_VERSION _(" -V, --version output version information and exit\n") +#define USAGE_MAN_TAIL(_man) _("\nFor more details see %s.\n"), _man + +#define UTIL_LINUX_VERSION _("%s from %s\n"), program_invocation_short_name, PACKAGE_STRING + +/* + * scanf modifiers for "strings allocation" + */ +#ifdef HAVE_SCANF_MS_MODIFIER +#define UL_SCNsA "%ms" +#elif defined(HAVE_SCANF_AS_MODIFIER) +#define UL_SCNsA "%as" +#endif + +/* + * seek stuff + */ +#ifndef SEEK_DATA +# define SEEK_DATA 3 +#endif +#ifndef SEEK_HOLE +# define SEEK_HOLE 4 +#endif + +#endif /* UTIL_LINUX_C_H */ |