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general.h

/* general.h -- defines that everybody likes to use. */

/* Copyright (C) 1993-2002 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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 2, or (at your option) any later
   version.

   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#if !defined (_GENERAL_H_)
#define _GENERAL_H_

#include "stdc.h"

#include "bashtypes.h"

#if defined (HAVE_SYS_RESOURCE_H) && defined (RLIMTYPE)
#  if defined (HAVE_SYS_TIME_H)
#    include <sys/time.h>
#  endif
#  include <sys/resource.h>
#endif

#if defined (HAVE_STRING_H)
#  include <string.h>
#else
#  include <strings.h>
#endif /* !HAVE_STRING_H */

#if defined (HAVE_LIMITS_H)
#  include <limits.h>
#endif

#include "xmalloc.h"

/* NULL pointer type. */
#if !defined (NULL)
#  if defined (__STDC__)
#    define NULL ((void *) 0)
#  else
#    define NULL 0x0
#  endif /* !__STDC__ */
#endif /* !NULL */

/* Hardly used anymore */
#define pointer_to_int(x)     (int)((char *)x - (char *)0)

#if defined (alpha) && defined (__GNUC__) && !defined (strchr) && !defined (__STDC__)
extern char *strchr (), *strrchr ();
#endif

#if !defined (strcpy) && (defined (HAVE_DECL_STRCPY) && !HAVE_DECL_STRCPY)
extern char *strcpy __P((char *, const char *));
#endif

#if !defined (savestring)
#  define savestring(x) (char *)strcpy (xmalloc (1 + strlen (x)), (x))
#endif

#ifndef member
#  define member(c, s) ((c) ? ((char *)xstrchr ((s), (c)) != (char *)NULL) : 0)
#endif

#ifndef whitespace
#define whitespace(c) (((c) == ' ') || ((c) == '\t'))
#endif

#ifndef CHAR_MAX
#  ifdef __CHAR_UNSIGNED__
#    define CHAR_MAX    0xff
#  else
#    define CHAR_MAX    0x7f
#  endif
#endif

#ifndef CHAR_BIT
#  define CHAR_BIT 8
#endif

/* Nonzero if the integer type T is signed.  */
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))

/* Bound on length of the string representing an integer value of type T.
   Subtract one for the sign bit if T is signed;
   302 / 1000 is log10 (2) rounded up;
   add one for integer division truncation;
   add one more for a minus sign if t is signed.  */
#define INT_STRLEN_BOUND(t) \
  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED (t)) * 302 / 1000 \
   + 1 + TYPE_SIGNED (t))


/* Define exactly what a legal shell identifier consists of. */
#define legal_variable_starter(c) (ISALPHA(c) || (c == '_'))
#define legal_variable_char(c)      (ISALNUM(c) || c == '_')

/* Definitions used in subst.c and by the `read' builtin for field
   splitting. */
#define spctabnl(c)     ((c) == ' ' || (c) == '\t' || (c) == '\n')

/* All structs which contain a `next' field should have that field
   as the first field in the struct.  This means that functions
   can be written to handle the general case for linked lists. */
typedef struct g_list {
  struct g_list *next;
} GENERIC_LIST;

/* Here is a generic structure for associating character strings
   with integers.  It is used in the parser for shell tokenization. */
typedef struct {
  char *word;
  int token;
} STRING_INT_ALIST;

/* A macro to avoid making an uneccessary function call. */
#define REVERSE_LIST(list, type) \
  ((list && list->next) ? (type)list_reverse ((GENERIC_LIST *)list) \
                  : (type)(list))

#if __GNUC__ > 1
#  define FASTCOPY(s, d, n)  __builtin_memcpy (d, s, n)
#else /* !__GNUC__ */
#  if !defined (HAVE_BCOPY)
#    if !defined (HAVE_MEMMOVE)
#      define FASTCOPY(s, d, n)  memcpy (d, s, n)
#    else
#      define FASTCOPY(s, d, n)  memmove (d, s, n)
#    endif /* !HAVE_MEMMOVE */
#  else /* HAVE_BCOPY */
#    define FASTCOPY(s, d, n)  bcopy (s, d, n)
#  endif /* HAVE_BCOPY */
#endif /* !__GNUC__ */

/* String comparisons that possibly save a function call each. */
#define STREQ(a, b) ((a)[0] == (b)[0] && strcmp(a, b) == 0)
#define STREQN(a, b, n) ((n == 0) ? (1) \
                          : ((a)[0] == (b)[0] && strncmp(a, b, n) == 0))

/* More convenience definitions that possibly save system or libc calls. */
#define STRLEN(s) (((s) && (s)[0]) ? ((s)[1] ? ((s)[2] ? strlen(s) : 2) : 1) : 0)
#define FREE(s)  do { if (s) free (s); } while (0)
#define MEMBER(c, s) (((c) && c == (s)[0] && !(s)[1]) || (member(c, s)))

/* A fairly hairy macro to check whether an allocated string has more room,
   and to resize it using xrealloc if it does not.
   STR is the string (char *)
   CIND is the current index into the string (int)
   ROOM is the amount of additional room we need in the string (int)
   CSIZE is the currently-allocated size of STR (int)
   SINCR is how much to increment CSIZE before calling xrealloc (int) */

#define RESIZE_MALLOCED_BUFFER(str, cind, room, csize, sincr) \
  do { \
    if ((cind) + (room) >= csize) \
      { \
      while ((cind) + (room) >= csize) \
        csize += (sincr); \
      str = xrealloc (str, csize); \
      } \
  } while (0)

/* Function pointers can be declared as (Function *)foo. */
#if !defined (_FUNCTION_DEF)
#  define _FUNCTION_DEF
typedef int Function ();
typedef void VFunction ();
typedef char *CPFunction ();        /* no longer used */
typedef char **CPPFunction ();            /* no longer used */
#endif /* _FUNCTION_DEF */

#ifndef SH_FUNCTION_TYPEDEF
#  define SH_FUNCTION_TYPEDEF

/* Shell function typedefs with prototypes */
/* `Generic' function pointer typedefs */

typedef int sh_intfunc_t __P((int));
typedef int sh_ivoidfunc_t __P((void));
typedef int sh_icpfunc_t __P((char *));
typedef int sh_icppfunc_t __P((char **));
typedef int sh_iptrfunc_t __P((PTR_T));

typedef void sh_voidfunc_t __P((void));
typedef void sh_vintfunc_t __P((int));
typedef void sh_vcpfunc_t __P((char *));
typedef void sh_vcppfunc_t __P((char **));
typedef void sh_vptrfunc_t __P((PTR_T));

typedef int sh_wdesc_func_t __P((WORD_DESC *));
typedef int sh_wlist_func_t __P((WORD_LIST *));

typedef int sh_glist_func_t __P((GENERIC_LIST *));

typedef char *sh_string_func_t __P((char *));   /* like savestring, et al. */

typedef int sh_msg_func_t __P((const char *, ...));   /* printf(3)-like */
typedef void sh_vmsg_func_t __P((const char *, ...)); /* printf(3)-like */

/* Specific function pointer typedefs.  Most of these could be done
   with #defines. */
typedef void sh_sv_func_t __P((char *));  /* sh_vcpfunc_t */
typedef void sh_free_func_t __P((PTR_T)); /* sh_vptrfunc_t */
typedef void sh_resetsig_func_t __P((int));     /* sh_vintfunc_t */

typedef int sh_ignore_func_t __P((const char *));     /* sh_icpfunc_t */

typedef int sh_assign_func_t __P((const char *));     /* sh_icpfunc_t */

typedef int sh_builtin_func_t __P((WORD_LIST *)); /* sh_wlist_func_t */

#endif /* SH_FUNCTION_TYPEDEF */

#define NOW ((time_t) time ((time_t *) 0))

/* Some defines for calling file status functions. */
#define FS_EXISTS   0x1
#define FS_EXECABLE       0x2
#define FS_EXEC_PREFERRED 0x4
#define FS_EXEC_ONLY      0x8
#define FS_DIRECTORY      0x10
#define FS_NODIRS   0x20

/* Default maximum for move_to_high_fd */
#define HIGH_FD_MAX     256

/* The type of function passed as the fourth argument to qsort(3). */
#ifdef __STDC__
typedef int QSFUNC (const void *, const void *);
#else
typedef int QSFUNC ();
#endif 

/* Some useful definitions for Unix pathnames.  Argument convention:
   x == string, c == character */

#if !defined (__CYGWIN__)
#  define ABSPATH(x)    ((x)[0] == '/')
#  define RELPATH(x)    ((x)[0] != '/')
#else /* __CYGWIN__ */
#  define ABSPATH(x)    (((x)[0] && ISALPHA((unsigned char)(x)[0]) && (x)[1] == ':' && (x)[2] == '/') || (x)[0] == '/')
#  define RELPATH(x)    (!(x)[0] || ((x)[1] != ':' && (x)[0] != '/'))
#endif /* __CYGWIN__ */

#define ROOTEDPATH(x)   (ABSPATH(x))

#define DIRSEP    '/'
#define ISDIRSEP(c)     ((c) == '/')
#define PATHSEP(c)      (ISDIRSEP(c) || (c) == 0)

#if 0
/* Declarations for functions defined in xmalloc.c */
extern PTR_T xmalloc __P((size_t));
extern PTR_T xrealloc __P((void *, size_t));
extern void xfree __P((void *));
#endif

/* Declarations for functions defined in general.c */
extern void posix_initialize __P((int));

#if defined (RLIMTYPE)
extern RLIMTYPE string_to_rlimtype __P((char *));
extern void print_rlimtype __P((RLIMTYPE, int));
#endif

extern int all_digits __P((char *));
extern int legal_number __P((char *, intmax_t *));
extern int legal_identifier __P((char *));
extern int check_identifier __P((WORD_DESC *, int));
extern int assignment __P((const char *));

extern int sh_unset_nodelay_mode __P((int));
extern int sh_validfd __P((int));
extern void check_dev_tty __P((void));
extern int move_to_high_fd __P((int, int, int));
extern int check_binary_file __P((char *, int));

#ifdef _POSIXSTAT_H_
extern int same_file __P((char *, char *, struct stat *, struct stat *));
#endif

extern char *make_absolute __P((char *, char *));
extern int absolute_pathname __P((const char *));
extern int absolute_program __P((const char *));
extern char *base_pathname __P((char *));
extern char *full_pathname __P((char *));
extern char *polite_directory_format __P((char *));

extern char *extract_colon_unit __P((char *, int *));

extern void tilde_initialize __P((void));
extern char *bash_tilde_expand __P((const char *, int));

extern int group_member __P((gid_t));
extern char **get_group_list __P((int *));
extern int *get_group_array __P((int *));

#endif      /* _GENERAL_H_ */

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