grub2/include/grub/misc.h

/* misc.h - prototypes for misc functions */
/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2002,2003,2005,2006,2007,2008,2009,2010  Free Software Foundation, Inc.
 *
 *  GRUB is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  GRUB is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GRUB_MISC_HEADER
#define GRUB_MISC_HEADER	1

#include <stdarg.h>
#include <grub/types.h>
#include <grub/symbol.h>
#include <grub/err.h>
#include <grub/i18n.h>
#include <grub/compiler.h>

#define ALIGN_UP(addr, align) \
	(((addr) + (typeof (addr)) (align) - 1) & ~((typeof (addr)) (align) - 1))
#define ALIGN_UP_OVERHEAD(addr, align) ((-(addr)) & ((typeof (addr)) (align) - 1))
#define ALIGN_DOWN(addr, align) \
	((addr) & ~((typeof (addr)) (align) - 1))
#define ARRAY_SIZE(array) (sizeof (array) / sizeof (array[0]))
#define COMPILE_TIME_ASSERT(cond) switch (0) { case 1: case !(cond): ; }

#define grub_dprintf(condition, ...) grub_real_dprintf(GRUB_FILE, __LINE__, condition, __VA_ARGS__)

void *EXPORT_FUNC(grub_memmove) (void *dest, const void *src, grub_size_t n);
char *EXPORT_FUNC(grub_strcpy) (char *dest, const char *src);

static inline char *
grub_strncpy (char *dest, const char *src, int c)
{
  char *p = dest;

  while ((*p++ = *src++) != '\0' && --c)
    ;

  return dest;
}

static inline char *
grub_stpcpy (char *dest, const char *src)
{
  char *d = dest;
  const char *s = src;

  do
    *d++ = *s;
  while (*s++ != '\0');

  return d - 1;
}

/* XXX: If grub_memmove is too slow, we must implement grub_memcpy.  */
static inline void *
grub_memcpy (void *dest, const void *src, grub_size_t n)
{
  return grub_memmove (dest, src, n);
}

#if defined(__x86_64__) && !defined (GRUB_UTIL)
#if defined (__MINGW32__) || defined (__CYGWIN__) || defined (__MINGW64__)
#define GRUB_ASM_ATTR __attribute__ ((sysv_abi))
#else
#define GRUB_ASM_ATTR
#endif
#endif

int EXPORT_FUNC(grub_memcmp) (const void *s1, const void *s2, grub_size_t n);
int EXPORT_FUNC(grub_strcmp) (const char *s1, const char *s2);
int EXPORT_FUNC(grub_strncmp) (const char *s1, const char *s2, grub_size_t n);

char *EXPORT_FUNC(grub_strchr) (const char *s, int c);
char *EXPORT_FUNC(grub_strrchr) (const char *s, int c);
int EXPORT_FUNC(grub_strword) (const char *s, const char *w);

/* Copied from gnulib.
   Written by Bruno Haible <bruno@clisp.org>, 2005. */
static inline char *
grub_strstr (const char *haystack, const char *needle)
{
  /* Be careful not to look at the entire extent of haystack or needle
     until needed.  This is useful because of these two cases:
       - haystack may be very long, and a match of needle found early,
       - needle may be very long, and not even a short initial segment of
       needle may be found in haystack.  */
  if (*needle != '\0')
    {
      /* Speed up the following searches of needle by caching its first
	 character.  */
      char b = *needle++;

      for (;; haystack++)
	{
	  if (*haystack == '\0')
	    /* No match.  */
	    return 0;
	  if (*haystack == b)
	    /* The first character matches.  */
	    {
	      const char *rhaystack = haystack + 1;
	      const char *rneedle = needle;

	      for (;; rhaystack++, rneedle++)
		{
		  if (*rneedle == '\0')
		    /* Found a match.  */
		    return (char *) haystack;
		  if (*rhaystack == '\0')
		    /* No match.  */
		    return 0;
		  if (*rhaystack != *rneedle)
		    /* Nothing in this round.  */
		    break;
		}
	    }
	}
    }
  else
    return (char *) haystack;
}

int EXPORT_FUNC(grub_isspace) (int c);

static inline int
grub_isprint (int c)
{
  return (c >= ' ' && c <= '~');
}

static inline int
grub_iscntrl (int c)
{
  return (c >= 0x00 && c <= 0x1F) || c == 0x7F;
}

static inline int
grub_isalpha (int c)
{
  return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}

static inline int
grub_islower (int c)
{
  return (c >= 'a' && c <= 'z');
}

static inline int
grub_isupper (int c)
{
  return (c >= 'A' && c <= 'Z');
}

static inline int
grub_isgraph (int c)
{
  return (c >= '!' && c <= '~');
}

static inline int
grub_isdigit (int c)
{
  return (c >= '0' && c <= '9');
}

static inline int
grub_isxdigit (int c)
{
  return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}

static inline int
grub_isalnum (int c)
{
  return grub_isalpha (c) || grub_isdigit (c);
}

static inline int
grub_tolower (int c)
{
  if (c >= 'A' && c <= 'Z')
    return c - 'A' + 'a';

  return c;
}

static inline int
grub_toupper (int c)
{
  if (c >= 'a' && c <= 'z')
    return c - 'a' + 'A';

  return c;
}

static inline int
grub_strcasecmp (const char *s1, const char *s2)
{
  while (*s1 && *s2)
    {
      if (grub_tolower ((grub_uint8_t) *s1)
	  != grub_tolower ((grub_uint8_t) *s2))
	break;

      s1++;
      s2++;
    }

  return (int) grub_tolower ((grub_uint8_t) *s1)
    - (int) grub_tolower ((grub_uint8_t) *s2);
}

static inline int
grub_strncasecmp (const char *s1, const char *s2, grub_size_t n)
{
  if (n == 0)
    return 0;

  while (*s1 && *s2 && --n)
    {
      if (grub_tolower (*s1) != grub_tolower (*s2))
	break;

      s1++;
      s2++;
    }

  return (int) grub_tolower ((grub_uint8_t) *s1)
    - (int) grub_tolower ((grub_uint8_t) *s2);
}

/*
 * Note that these differ from the C standard's definitions of strtol,
 * strtoul(), and strtoull() by the addition of two const qualifiers on the end
 * pointer, which make the declaration match the *semantic* requirements of
 * their behavior.  This means that instead of:
 *
 *  char *s = "1234 abcd";
 *  char *end;
 *  unsigned long l;
 *
 *  l = grub_strtoul(s, &end, 10);
 *
 * We must one of:
 *
 *  const char *end;
 *  ... or ...
 *  l = grub_strtoul(s, (const char ** const)&end, 10);
 */
unsigned long EXPORT_FUNC(grub_strtoul) (const char * restrict str, const char ** const restrict end, int base);
unsigned long long EXPORT_FUNC(grub_strtoull) (const char * restrict str, const char ** const restrict end, int base);

static inline long
grub_strtol (const char * restrict str, const char ** const restrict end, int base)
{
  int negative = 0;
  unsigned long long magnitude;

  while (*str && grub_isspace (*str))
    str++;

  if (*str == '-')
    {
      negative = 1;
      str++;
    }

  magnitude = grub_strtoull (str, end, base);
  if (negative)
    {
      if (magnitude > (unsigned long) GRUB_LONG_MAX + 1)
        {
          grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
          return GRUB_LONG_MIN;
        }
      return -((long) magnitude);
    }
  else
    {
      if (magnitude > GRUB_LONG_MAX)
        {
          grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
          return GRUB_LONG_MAX;
        }
      return (long) magnitude;
    }
}

char *EXPORT_FUNC(grub_strdup) (const char *s) WARN_UNUSED_RESULT;
char *EXPORT_FUNC(grub_strndup) (const char *s, grub_size_t n) WARN_UNUSED_RESULT;
void *EXPORT_FUNC(grub_memset) (void *s, int c, grub_size_t n);
grub_size_t EXPORT_FUNC(grub_strlen) (const char *s) WARN_UNUSED_RESULT;
int EXPORT_FUNC(grub_printf) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));
int EXPORT_FUNC(grub_printf_) (const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 1, 2)));

/* Replace all `ch' characters of `input' with `with' and copy the
   result into `output'; return EOS address of `output'. */
static inline char *
grub_strchrsub (char *output, const char *input, char ch, const char *with)
{
  while (*input)
    {
      if (*input == ch)
	{
	  grub_strcpy (output, with);
	  output += grub_strlen (with);
	  input++;
	  continue;
	}
      *output++ = *input++;
    }
  *output = '\0';
  return output;
}

extern void (*EXPORT_VAR (grub_xputs)) (const char *str);

static inline int
grub_puts (const char *s)
{
  const char nl[2] = "\n";
  grub_xputs (s);
  grub_xputs (nl);

  return 1;	/* Cannot fail.  */
}

int EXPORT_FUNC(grub_puts_) (const char *s);
int EXPORT_FUNC(grub_debug_enabled) (const char *condition);
void EXPORT_FUNC(grub_real_dprintf) (const char *file,
                                     const int line,
                                     const char *condition,
                                     const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 4, 5)));
int EXPORT_FUNC(grub_vprintf) (const char *fmt, va_list args);
int EXPORT_FUNC(grub_snprintf) (char *str, grub_size_t n, const char *fmt, ...)
     __attribute__ ((format (GNU_PRINTF, 3, 4)));
int EXPORT_FUNC(grub_vsnprintf) (char *str, grub_size_t n, const char *fmt,
				 va_list args);
char *EXPORT_FUNC(grub_xasprintf) (const char *fmt, ...)
     __attribute__ ((format (GNU_PRINTF, 1, 2))) WARN_UNUSED_RESULT;
char *EXPORT_FUNC(grub_xvasprintf) (const char *fmt, va_list args) WARN_UNUSED_RESULT;
void EXPORT_FUNC(grub_exit) (void) __attribute__ ((noreturn));
grub_uint64_t EXPORT_FUNC(grub_divmod64) (grub_uint64_t n,
					  grub_uint64_t d,
					  grub_uint64_t *r);

/* Must match softdiv group in gentpl.py.  */
#if !defined(GRUB_MACHINE_EMU) && (defined(__arm__) || defined(__ia64__) || \
    (defined(__riscv) && (__riscv_xlen == 32)))
#define GRUB_DIVISION_IN_SOFTWARE 1
#else
#define GRUB_DIVISION_IN_SOFTWARE 0
#endif

/* Some division functions need to be in kernel if compiler generates calls
   to them. Otherwise we still need them for consistent tests but they go
   into a separate module.  */
#if GRUB_DIVISION_IN_SOFTWARE
#define EXPORT_FUNC_IF_SOFTDIV EXPORT_FUNC
#else
#define EXPORT_FUNC_IF_SOFTDIV(x) x
#endif

grub_int64_t
EXPORT_FUNC_IF_SOFTDIV(grub_divmod64s) (grub_int64_t n,
					grub_int64_t d,
					grub_int64_t *r);

grub_uint32_t
EXPORT_FUNC_IF_SOFTDIV (grub_divmod32) (grub_uint32_t n,
					grub_uint32_t d,
					grub_uint32_t *r);

grub_int32_t
EXPORT_FUNC_IF_SOFTDIV (grub_divmod32s) (grub_int32_t n,
					 grub_int32_t d,
					 grub_int32_t *r);

/* Inline functions.  */

static inline char *
grub_memchr (const void *p, int c, grub_size_t len)
{
  const char *s = (const char *) p;
  const char *e = s + len;

  for (; s < e; s++)
    if (*s == c)
      return (char *) s;

  return 0;
}


static inline unsigned int
grub_abs (int x)
{
  if (x < 0)
    return (unsigned int) (-x);
  else
    return (unsigned int) x;
}

/* Reboot the machine.  */
#if defined (GRUB_MACHINE_EMU) || defined (GRUB_MACHINE_QEMU_MIPS) || \
    defined (GRUB_MACHINE_EFI)
void EXPORT_FUNC(grub_reboot) (void) __attribute__ ((noreturn));
#else
void grub_reboot (void) __attribute__ ((noreturn));
#endif

#if defined (__clang__) && !defined (GRUB_UTIL)
void __attribute__ ((noreturn)) EXPORT_FUNC (abort) (void);
#endif

#ifdef GRUB_MACHINE_PCBIOS
/* Halt the system, using APM if possible. If NO_APM is true, don't
 * use APM even if it is available.  */
void grub_halt (int no_apm) __attribute__ ((noreturn));
#elif defined (__mips__) && !defined (GRUB_MACHINE_EMU)
void EXPORT_FUNC (grub_halt) (void) __attribute__ ((noreturn));
#else
void grub_halt (void) __attribute__ ((noreturn));
#endif

#ifdef GRUB_MACHINE_EMU
/* Flag to check if module loading is available.  */
extern const int EXPORT_VAR(grub_no_modules);
#else
#define grub_no_modules 0
#endif

static inline void
grub_error_save (struct grub_error_saved *save)
{
  grub_memcpy (save->errmsg, grub_errmsg, sizeof (save->errmsg));
  save->grub_errno = grub_errno;
  grub_errno = GRUB_ERR_NONE;
}

static inline void
grub_error_load (const struct grub_error_saved *save)
{
  grub_memcpy (grub_errmsg, save->errmsg, sizeof (grub_errmsg));
  grub_errno = save->grub_errno;
}

/*
 * grub_printf_fmt_checks() a fmt string for printf() against an expected
 * format. It is intended for cases where the fmt string could come from
 * an outside source and cannot be trusted.
 *
 * While expected fmt accepts a printf() format string it should be kept
 * as simple as possible. The printf() format strings with positional
 * parameters are NOT accepted, neither for fmt nor for fmt_expected.
 *
 * The fmt is accepted if it has equal or less arguments than fmt_expected
 * and if the type of all arguments match.
 *
 * Returns GRUB_ERR_NONE if fmt is acceptable.
 */
grub_err_t EXPORT_FUNC (grub_printf_fmt_check) (const char *fmt, const char *fmt_expected);

#if BOOT_TIME_STATS
struct grub_boot_time
{
  struct grub_boot_time *next;
  grub_uint64_t tp;
  const char *file;
  int line;
  char *msg;
};

extern struct grub_boot_time *EXPORT_VAR(grub_boot_time_head);

void EXPORT_FUNC(grub_real_boot_time) (const char *file,
				       const int line,
				       const char *fmt, ...) __attribute__ ((format (GNU_PRINTF, 3, 4)));
#define grub_boot_time(...) grub_real_boot_time(GRUB_FILE, __LINE__, __VA_ARGS__)
#else
#define grub_boot_time(...)
#endif

#define grub_max(a, b) (((a) > (b)) ? (a) : (b))
#define grub_min(a, b) (((a) < (b)) ? (a) : (b))

#define grub_log2ull(n) (GRUB_TYPE_BITS (grub_uint64_t) - __builtin_clzll (n) - 1)

#endif /* ! GRUB_MISC_HEADER */