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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 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 "lib.h"
- #include "types.h"
-
- /* Define common sorts of messages. */
-
- /* This should be called only after a system call fails. */
- #define FATAL_PERROR(s) do { perror (s); exit (errno); } while (0)
-
-
- #define START_FATAL() do { fputs ("fatal: ", stderr)
- #define END_FATAL() fputs (".\n", stderr); exit (1); } while (0)
-
- #define FATAL(s) \
- START_FATAL (); fprintf (stderr, "%s", s); END_FATAL ()
- #define FATAL1(s, e1) \
- START_FATAL (); fprintf (stderr, s, e1); END_FATAL ()
- #define FATAL2(s, e1, e2) \
- START_FATAL (); fprintf (stderr, s, e1, e2); END_FATAL ()
- #define FATAL3(s, e1, e2, e3) \
- START_FATAL (); fprintf (stderr, s, e1, e2, e3); END_FATAL ()
- #define FATAL4(s, e1, e2, e3, e4) \
- START_FATAL (); fprintf (stderr, s, e1, e2, e3, e4); END_FATAL ()
-
-
- #define START_WARNING() do { fputs ("warning: ", stderr)
- #define END_WARNING() fputs (".\n", stderr); fflush (stderr); } while (0)
-
- #define WARNING(s) \
- START_WARNING (); fprintf (stderr, "%s", s); END_WARNING ()
- #define WARNING1(s, e1) \
- START_WARNING (); fprintf (stderr, s, e1); END_WARNING ()
- #define WARNING2(s, e1, e2) \
- START_WARNING (); fprintf (stderr, s, e1, e2); END_WARNING ()
- #define WARNING3(s, e1, e2, e3) \
- START_WARNING (); fprintf (stderr, s, e1, e2, e3); END_WARNING ()
- #define WARNING4(s, e1, e2, e3, e4) \
- START_WARNING (); fprintf (stderr, s, e1, e2, e3, e4); END_WARNING ()
-
- /* Define useful abbreviations. */
-
- /* This is the maximum number of numerals that result when a 64-bit
- integer is converted to a string, plus one for a trailing null byte,
- plus one for a sign. */
- #define MAX_INT_LENGTH 21
-
- /* 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) ((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)
-
- #define STREQ(s1, s2) (strcmp (s1, s2) == 0)
-
- /* 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);
-
- /* Like `atoi', but disallow negative numbers. */
- extern const unsigned atou (string);
-
- /* The converses of atoi, atou, and atof. These all return dynamically
- allocated strings. `dtoa' is so-named because `ftoa' is a library
- function on some systems (the IBM RT), and the loader complains that
- is defined twice, for reasons I don't understand. */
- extern string itoa (int);
- extern string utoa (unsigned);
- extern string dtoa (double);
-
- /* Like their stdio counterparts, but abort on error, after calling
- perror(3) with FILENAME as its argument. */
- extern FILE *xfopen (string filename, string mode);
- extern void xfclose (FILE *, string filename);
- extern void xfseek (FILE *, long, int, string filename);
- extern four_bytes xftell (FILE *, string filename);
-
- /* Copies the file FROM to the file TO, then unlinks FROM. */
- extern void xrename (string from, string to);
-
- /* Return NAME with any leading path stripped off. This returns a
- pointer into NAME. */
- extern string basename (string name);
-
-
-
- /* 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 */
-