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+/* global.h: extend the standard programming environment a little.  This
+   is included from config.h, which everyone includes.
+
+Copyright (C) 1992, 93 Free Software Foundation, Inc.
+
+This program 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.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifndef GLOBAL_H
+#define GLOBAL_H
+
+#include <kpathsea/lib.h>
+#include <kpathsea/types.h>
+#include "moretypes.h"
+
+
+/* Define useful abbreviations.  */
+
+/* Printer's points, as defined by TeX (and good typesetters everywhere).  */
+#define POINTS_PER_INCH  72.27
+
+/* Convert a number V in pixels to printer's points, and vice versa,
+   assuming a resolution of DPI pixels per inch.  */
+#define PIXELS_TO_POINTS(v, dpi) (POINTS_PER_INCH * (v) / (dpi))
+#define POINTS_TO_REAL_PIXELS(v, dpi) ((v) * (dpi) / POINTS_PER_INCH)
+#define POINTS_TO_PIXELS(v, dpi) ((int) (POINTS_TO_REAL_PIXELS (v, dpi) + .5))
+
+/* Some simple numeric operations.  It is possible to define these much
+   more cleanly in GNU C, but we haven't done that (yet).  */
+#define SQUARE(x) ((x) * (x))
+#define CUBE(x) ((x) * (x) * (x))
+#define	SAME_SIGN(u,v) ((u) >= 0 && (v) >= 0 || (u) < 0 && (v) < 0)
+#define ROUND(x) ((int) ((x) + .5 * SIGN (x)))
+#define SIGN(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
+
+#ifndef MAX
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+/* Too bad C doesn't define operators for these.  */
+#define MAX_EQUALS(var, expr) if ((expr) > (var)) (var) = (expr)
+#define MIN_EQUALS(var, expr) if ((expr) < (var)) (var) = (expr)
+
+/* Declarations for commonly-used routines we provide ourselves.  The
+   ones here are only needed by us, so we do not provide them in
+   unprototyped form.  Others are declared both ways in lib.h.  */
+
+/* Return the current date and time a la date(1).  */
+extern string now (void);
+
+/* Check if a string is a valid floating-point or decimal integer.
+   Returns false if passed NULL.  */
+extern boolean float_ok (string);
+extern boolean integer_ok (string);
+
+/* My converses of atoi, atou, and atof.  These all return dynamically
+   allocated strings.  */
+extern string itoa (int);
+extern string utoa (unsigned);
+extern string xdtoa (double);
+
+/* Copies the file FROM to the file TO, then unlinks FROM.  */
+extern void xrename (string from, string to);
+
+/* If P or *P is null, abort.  Otherwise, call free(3) on P,
+   and then set *P to NULL.  */
+extern void safe_free (address *p);
+
+
+/* Math functions.  */
+
+/* Says whether V1 and V2 are within REAL_EPSILON of each other.
+   Fixed-point arithmetic would be better, to guarantee machine
+   independence, but it's so much more painful to work with.  The value
+   here is smaller than can be represented in either a `fix_word' or a
+   `scaled_num', so more precision than this will be lost when we
+   output, anyway.  */
+#define REAL_EPSILON 0.00001
+extern const boolean epsilon_equal (real v1, real v2);
+
+/* Arc cosine, in degrees.  */
+extern const real acosd (real);
+
+/* Return the Euclidean distance between the two points.  */
+extern const real distance (real_coordinate_type, real_coordinate_type);
+extern const real int_distance (coordinate_type, coordinate_type);
+
+/* Slope between two points (delta y per unit x).  */
+extern const real slope (real_coordinate_type, real_coordinate_type);
+
+/* Make a real coordinate from an integer one, and vice versa.  */
+extern const real_coordinate_type int_to_real_coord (coordinate_type);
+extern const coordinate_type real_to_int_coord (real_coordinate_type);
+
+/* Test if two integer points are adjacent.  */
+extern const boolean points_adjacent_p (int row1, int col1, int r2, int c2);
+
+/* Find the largest and smallest elements of an array.  */
+extern void find_bounds (real values[], unsigned value_count,
+	                 /* returned: */ real *the_min, real *the_max);
+
+/* Make all the elements in the array between zero and one.  */
+extern real *map_to_unit (real * values, unsigned value_count);
+
+
+/* String functions.  */
+
+/* Return (a fresh copy of) SOURCE beginning at START and ending at
+   LIMIT.  (Or NULL if LIMIT < START.)  */
+extern string substring (string source, const unsigned start,
+                         const unsigned limit);
+
+/* Change all uppercase letters in S to lowercase.  */
+extern string lowercasify (string s);
+
+
+/* Character code parsing.  */
+
+/* If the string S parses as a character code, this sets *VALID to
+   `true' and returns the number.  If it doesn't, it sets *VALID to
+   `false' and the return value is garbage.
+   
+   We allow any of the following possibilies: a single character, as in
+   `a' or `0'; a decimal number, as in `21'; an octal number, as in `03'
+   or `0177'; a hexadecimal number, as in `0x3' or `0xff'.  */
+extern charcode_type parse_charcode (string s, boolean *valid);
+
+/* Like `parse_charcode', but gives a fatal error if the string isn't a
+   valid character code.  */
+extern charcode_type xparse_charcode (string s);
+
+/* The environment variable name with which to look up auxiliary files.  */
+#ifndef LIB_ENVVAR
+#define LIB_ENVVAR "FONTUTIL_LIB"
+#endif
+
+#endif /* not GLOBAL_H */