src/preproc/grn/hdb.cpp

   1  /* Last non-groff version: hdb.c  1.8 (Berkeley) 84/10/20
   2  *
   3  * Copyright -C- 1982 Barry S. Roitblat
   4  *
   5  * This file contains database routines for the hard copy programs of the
   6  * gremlin picture editor.
   7  */
   8
   9 #include <stdlib.h>
  10 #include "gprint.h"
  11 #include <string.h>
  12 #include <ctype.h>
  13
  14 #include "errarg.h"
  15 #include "error.h"
  16
  17 #define MAXSTRING 128
  18 #define MAXSTRING_S "127"
  19
  20 /* imports from main.cpp */
  21
  22 extern int linenum;             /* current line number in input file */
  23 extern char gremlinfile[];      /* name of file currently reading */
  24 extern int SUNFILE;             /* TRUE if SUN gremlin file */
  25 extern int compatibility_flag;  /* TRUE if in compatibility mode */
  26 extern void savebounds(double x, double y);
  27
  28 /* imports from hpoint.cpp */
  29
  30 extern POINT *PTInit();
  31 extern POINT *PTMakePoint(double x, double y, POINT ** pplist);
  32
  33
  34 int DBGetType(register char *s);
  35
  36
  37 /*
  38  * This routine returns a pointer to an initialized database element which
  39  * would be the only element in an empty list.
  40  */
  41 ELT *
  42 DBInit()
  43 {
  44   return ((ELT *) NULL);
  45 }                               /* end DBInit */
  46
  47
  48 /*
  49  * This routine creates a new element with the specified attributes and
  50  * links it into database.
  51  */
  52 ELT *
  53 DBCreateElt(int type,
  54             POINT * pointlist,
  55             int brush,
  56             int size,
  57             char *text,
  58             ELT **db)
  59 {
  60   register ELT *temp;
  61
  62   temp = (ELT *) malloc(sizeof(ELT));
  63   temp->nextelt = *db;
  64   temp->type = type;
  65   temp->ptlist = pointlist;
  66   temp->brushf = brush;
  67   temp->size = size;
  68   temp->textpt = text;
  69   *db = temp;
  70   return (temp);
  71 }                               /* end CreateElt */
  72
  73
  74 /*
  75  * This routine reads the specified file into a database and returns a
  76  * pointer to that database.
  77  */
  78 ELT *
  79 DBRead(register FILE *file)
  80 {
  81   register int i;
  82   register int done;            /* flag for input exhausted */
  83   register double nx;           /* x holder so x is not set before orienting */
  84   int type;                     /* element type */
  85   ELT *elist;                   /* pointer to the file's elements */
  86   POINT *plist;                 /* pointer for reading in points */
  87   char string[MAXSTRING], *txt;
  88   double x, y;                  /* x and y are read in point coords */
  89   int len, brush, size;
  90   int lastpoint;
  91
  92   SUNFILE = FALSE;
  93   elist = DBInit();
  94   (void) fscanf(file, "%" MAXSTRING_S "s%*[^\n]\n", string);
  95   if (strcmp(string, "gremlinfile")) {
  96     if (strcmp(string, "sungremlinfile")) {
  97       error("`%1' is not a gremlin file", gremlinfile);
  98       return (elist);
  99     }
 100     SUNFILE = TRUE;
 101   }
 102
 103   (void) fscanf(file, "%d%lf%lf\n", &size, &x, &y);
 104   /* ignore orientation and file positioning point */
 105
 106   done = FALSE;
 107   while (!done) {
 108     /* if (fscanf(file,"%" MAXSTRING_S "s\n", string) == EOF) */
 109     /* I changed the scanf format because the element */
 110     /* can have two words (e.g. CURVE SPLINE)         */
 111     if (fscanf(file, "\n%" MAXSTRING_S "[^\n]%*[^\n]\n", string) == EOF) {
 112       error("`%1', error in file format", gremlinfile);
 113       return (elist);
 114     }
 115
 116     type = DBGetType(string);   /* interpret element type */
 117     if (type < 0) {             /* no more data */
 118       done = TRUE;
 119     } else {
 120 #ifdef UW_FASTSCAN
 121       (void) xscanf(file, &x, &y);              /* always one point */
 122 #else
 123       (void) fscanf(file, "%lf%lf\n", &x, &y);  /* always one point */
 124 #endif  /* UW_FASTSCAN */
 125       plist = PTInit();         /* NULL point list */
 126
 127       /*
 128        * Files created on the SUN have point lists terminated by a line
 129        * containing only an asterik ('*').  Files created on the AED have
 130        * point lists terminated by the coordinate pair (-1.00 -1.00).
 131        */
 132       if (TEXT(type)) {         /* read only first point for TEXT elements */
 133         nx = xorn(x, y);
 134         y = yorn(x, y);
 135         (void) PTMakePoint(nx, y, &plist);
 136         savebounds(nx, y);
 137
 138 #ifdef UW_FASTSCAN
 139         while (xscanf(file, &x, &y));
 140 #else
 141         lastpoint = FALSE;
 142         do {
 143           fgets(string, MAXSTRING, file);
 144           if (string[0] == '*') {       /* SUN gremlin file */
 145             lastpoint = TRUE;
 146           } else {
 147             (void) sscanf(string, "%lf%lf", &x, &y);
 148             if ((x == -1.00 && y == -1.00) && (!SUNFILE))
 149               lastpoint = TRUE;
 150             else {
 151               if (compatibility_flag)
 152                 savebounds(xorn(x, y), yorn(x, y));
 153             }
 154           }
 155         } while (!lastpoint);
 156 #endif  /* UW_FASTSCAN */
 157       } else {                  /* not TEXT element */
 158 #ifdef UW_FASTSCAN
 159         do {
 160           nx = xorn(x, y);
 161           y = yorn(x, y);
 162           (void) PTMakePoint(nx, y, &plist);
 163           savebounds(nx, y);
 164         } while (xscanf(file, &x, &y));
 165 #else
 166         lastpoint = FALSE;
 167         while (!lastpoint) {
 168           nx = xorn(x, y);
 169           y = yorn(x, y);
 170           (void) PTMakePoint(nx, y, &plist);
 171           savebounds(nx, y);
 172
 173           fgets(string, MAXSTRING, file);
 174           if (string[0] == '*') {       /* SUN gremlin file */
 175             lastpoint = TRUE;
 176           } else {
 177             (void) sscanf(string, "%lf%lf", &x, &y);
 178             if ((x == -1.00 && y == -1.00) && (!SUNFILE))
 179               lastpoint = TRUE;
 180           }
 181         }
 182 #endif  /* UW_FASTSCAN */
 183       }
 184       (void) fscanf(file, "%d%d\n", &brush, &size);
 185       (void) fscanf(file, "%d", &len);  /* text length */
 186       (void) getc(file);                /* eat blank */
 187       txt = (char *) malloc((unsigned) len + 1);
 188       for (i = 0; i < len; ++i) {       /* read text */
 189         int c = getc(file);
 190         if (c == EOF)
 191           break;
 192         txt[i] = c;
 193       }
 194       txt[len] = '\0';
 195       (void) DBCreateElt(type, plist, brush, size, txt, &elist);
 196     }                           /* end else */
 197   } /* end while not done */ ;
 198   return (elist);
 199 }                               /* end DBRead */
 200
 201
 202 /*
 203  * Interpret element type in string s.
 204  * Old file format consisted of integer element types.
 205  * New file format has literal names for element types.
 206  */
 207 int
 208 DBGetType(register char *s)
 209 {
 210   if (isdigit(s[0]) || (s[0] == '-'))   /* old element format or EOF */
 211     return (atoi(s));
 212
 213   switch (s[0]) {
 214   case 'P':
 215     return (POLYGON);
 216   case 'V':
 217     return (VECTOR);
 218   case 'A':
 219     return (ARC);
 220   case 'C':
 221     if (s[1] == 'U') {
 222       if (s[5] == '\n')
 223         return (CURVE);
 224       switch (s[7]) {
 225       case 'S':
 226         return(BSPLINE);
 227       case 'E':
 228         fprintf(stderr,
 229                 "Warning: Bezier Curves will be printed as B-Splines\n");
 230         return(BSPLINE);
 231       default:
 232         return(CURVE);
 233       }
 234     }
 235     switch (s[4]) {
 236     case 'L':
 237       return (CENTLEFT);
 238     case 'C':
 239       return (CENTCENT);
 240     case 'R':
 241       return (CENTRIGHT);
 242     default:
 243       fatal("unknown element type");
 244     }
 245   case 'B':
 246     switch (s[3]) {
 247     case 'L':
 248       return (BOTLEFT);
 249     case 'C':
 250       return (BOTCENT);
 251     case 'R':
 252       return (BOTRIGHT);
 253     default:
 254       fatal("unknown element type");
 255     }
 256   case 'T':
 257     switch (s[3]) {
 258     case 'L':
 259       return (TOPLEFT);
 260     case 'C':
 261       return (TOPCENT);
 262     case 'R':
 263       return (TOPRIGHT);
 264     default:
 265       fatal("unknown element type");
 266     }
 267   default:
 268     fatal("unknown element type");
 269   }
 270
 271   return 0;                             /* never reached */
 272 }
 273
 274 #ifdef UW_FASTSCAN
 275 /*
 276  * Optimization hack added by solomon@crys.wisc.edu, 12/2/86.
 277  * A huge fraction of the time was spent reading floating point numbers from
 278  * the input file, but the numbers always have the format 'ddd.dd'.  Thus
 279  * the following special-purpose version of fscanf.
 280  *
 281  * xscanf(f,xp,yp) does roughly what fscanf(f,"%f%f",xp,yp) does except:
 282  *   -the next piece of input must be of the form
 283  *      <space>* <digit>*'.'<digit>* <space>* <digit>*'.'<digit>*
 284  *   -xscanf eats the character following the second number
 285  *   -xscanf returns 0 for "end-of-data" indication, 1 otherwise, where
 286  *    end-of-data is signalled by a '*' [in which case the rest of the
 287  *    line is gobbled], or by '-1.00 -1.00' [but only if !SUNFILE].
 288  */
 289 int
 290 xscanf(FILE *f,
 291        double *xp,
 292        double *yp)
 293 {
 294   register int c, i, j, m, frac;
 295   int iscale = 1, jscale = 1;   /* x = i/scale, y=j/jscale */
 296
 297   while ((c = getc(f)) == ' ');
 298   if (c == '*') {
 299     while ((c = getc(f)) != '\n');
 300     return 0;
 301   }
 302   i = m = frac = 0;
 303   while (isdigit(c) || c == '.' || c == '-') {
 304     if (c == '-') {
 305       m++;
 306       c = getc(f);
 307       continue;
 308     }
 309     if (c == '.')
 310       frac = 1;
 311     else {
 312       if (frac)
 313         iscale *= 10;
 314       i = 10 * i + c - '0';
 315     }
 316     c = getc(f);
 317   }
 318   if (m)
 319     i = -i;
 320   *xp = (double) i / (double) iscale;
 321
 322   while ((c = getc(f)) == ' ');
 323   j = m = frac = 0;
 324   while (isdigit(c) || c == '.' || c == '-') {
 325     if (c == '-') {
 326       m++;
 327       c = getc(f);
 328       continue;
 329     }
 330     if (c == '.')
 331       frac = 1;
 332     else {
 333       if (frac)
 334         jscale *= 10;
 335       j = 10 * j + c - '0';
 336     }
 337     c = getc(f);
 338   }
 339   if (m)
 340     j = -j;
 341   *yp = (double) j / (double) jscale;
 342   return (SUNFILE || i != -iscale || j != -jscale);
 343 }
 344 #endif  /* UW_FASTSCAN */
 345
 346 /* EOF */