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+typedef int (*FUNC_PTR)(...);
+#else
+typedef int (*FUNC_PTR)();
+#endif
+
+#ifndef __PROTO
+#  define __PROTO(proto) proto
+#endif
+
+#if 1
+/* this order means we can use  x-(just*strlen(text)*t->h_char)/2 if
+ * term cannot justify
+ */
+typedef enum JUSTIFY {
+    LEFT,
+    CENTRE,
+    RIGHT
+} JUSTIFY;
+
+/*
+ *    color modes
+ */
+typedef enum { 
+    SMPAL_COLOR_MODE_NONE = '0',
+    SMPAL_COLOR_MODE_GRAY = 'g',      /* grayscale only */
+    SMPAL_COLOR_MODE_RGB = 'r',       /* one of several fixed transforms */ 
+    SMPAL_COLOR_MODE_FUNCTIONS = 'f', /* user definded transforms */
+    SMPAL_COLOR_MODE_GRADIENT = 'd'   /* interpolated table: 
+				       * explicitly defined or read from file */
+} palette_color_mode;
+
+/* Contains a colour in RGB scheme.
+   Values of  r, g and b  are all in range [0;1] */
+typedef struct {
+    double r, g, b;
+} rgb_color;
+
+/* to build up gradients:  whether it is really red, green and blue or maybe
+ * hue saturation and value in col depends on cmodel */
+typedef struct {
+  double pos;
+  rgb_color col;
+} gradient_struct;
+
+typedef struct value t_value;
+
+# define MAX_NUM_VAR	5
+
+/* user-defined function table entry */
+typedef struct udft_entry {
+    struct udft_entry *next_udf; /* pointer to next udf in linked list */
+    char *udf_name;		/* name of this function entry */
+    struct at_type *at;		/* pointer to action table to execute */
+    char *definition;		/* definition of function as typed */
+    t_value dummy_values[MAX_NUM_VAR]; /* current value of dummy variables */
+} udft_entry;
+
+typedef struct {
+  /** Constants: **/
+
+  /* (Fixed) number of formulae implemented for gray index to RGB
+   * mapping in color.c.  Usage: somewhere in `set' command to check
+   * that each of the below-given formula R,G,B are lower than this
+   * value. */
+  int colorFormulae;
+
+  /** Values that can be changed by `set' and shown by `show' commands: **/
+
+  /* can be SMPAL_COLOR_MODE_GRAY or SMPAL_COLOR_MODE_RGB */
+  palette_color_mode colorMode;
+  /* mapping formulae for SMPAL_COLOR_MODE_RGB */
+  int formulaR, formulaG, formulaB;
+  char positive;		/* positive or negative figure */
+
+  /* Now the variables that contain the discrete approximation of the
+   * desired palette of smooth colours as created by make_palette in
+   * pm3d.c.  This is then passed into terminal's make_palette, who
+   * transforms this [0;1] into whatever it supports.  */
+
+  /* Only this number of colour positions will be used even though
+   * there are some more available in the discrete palette of the
+   * terminal.  Useful for multiplot.  Max. number of colours is taken
+   * if this value equals 0.  Unused by: PostScript */
+  int use_maxcolors;
+  /* Number of colours used for the discrete palette. Equals to the
+   * result from term->make_palette(NULL), or restricted by
+   * use_maxcolor.  Used by: pm, gif. Unused by: PostScript */
+  int colors;
+  /* Table of RGB triplets resulted from applying the formulae. Used
+   * in the 2nd call to term->make_palette for a terminal with
+   * discrete colours. Unused by PostScript which has calculates them
+   * analytically. */
+  rgb_color *color;
+
+  /** Variables used by some terminals **/
+  
+  /* Option unique for output to PostScript file.  By default,
+   * ps_allcF=0 and only the 3 selected rgb color formulae are written
+   * into the header preceding pm3d map in the file.  If ps_allcF is
+   * non-zero, then print there all color formulae, so that it is easy
+   * to play with choosing manually any color scheme in the PS file
+   * (see the definition of "/g"). Like that you can get the
+   * Rosenbrock multiplot figure on my gnuplot.html#pm3d demo page.
+   * Note: this option is used by all terminals of the postscript
+   * family, i.e. postscript, pslatex, epslatex, so it will not be
+   * comfortable to move it to the particular .trm files. */
+  char ps_allcF;
+
+  /* These variables are used to define interpolated color palettes:
+   * gradient is an array if (gray,color) pairs.  This array is 
+   * gradient_num entries big.  
+   * Interpolated tables are used if colorMode==SMPAL_COLOR_MODE_GRADIENT */
+  int gradient_num;
+  gradient_struct *gradient;
+
+  /* the used color model: RGB, HSV, XYZ, etc. */
+  int cmodel;  
+  
+  /* Three mapping function for gray->RGB/HSV/XYZ/etc. mapping
+   * used if colorMode == SMPAL_COLOR_MODE_FUNCTIONS */
+  struct udft_entry Afunc;  /* R for RGB, H for HSV, C for CMY, ... */
+  struct udft_entry Bfunc;  /* G for RGB, S for HSV, M for CMY, ... */
+  struct udft_entry Cfunc;  /* B for RGB, V for HSV, Y for CMY, ... */
+
+  /* gamma for gray scale palettes only */
+  double gamma;
+} t_sm_palette;
+
+/* a point (with integer coordinates) for use in polygon drawing */
+typedef struct {
+    unsigned int x, y;
+#ifdef EXTENDED_COLOR_SPECS
+    double z;
+    colorspec_t spec;
+#endif
+} gpiPoint;
+
+typedef struct TERMENTRY {
+    const char *name;
+#ifdef WIN16
+    const char GPFAR description[80];  /* to make text go in FAR segment */
+#else
+    const char *description;
+#endif
+    unsigned int xmax,ymax,v_char,h_char,v_tic,h_tic;
+
+    void (*options) __PROTO((void));
+    void (*init) __PROTO((void));
+    void (*reset) __PROTO((void));
+    void (*text) __PROTO((void));
+    int (*scale) __PROTO((double, double));
+    void (*graphics) __PROTO((void));
+    void (*move) __PROTO((unsigned int, unsigned int));
+    void (*vector) __PROTO((unsigned int, unsigned int));
+    void (*linetype) __PROTO((int));
+    void (*put_text) __PROTO((unsigned int, unsigned int, const char*));
+    /* the following are optional. set term ensures they are not NULL */
+    int (*text_angle) __PROTO((int));
+    int (*justify_text) __PROTO((enum JUSTIFY));
+    void (*point) __PROTO((unsigned int, unsigned int,int));