out.c

   1 /*      $Id: out.c,v 1.4 2009/10/09 06:54:11 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <sys/types.h>
  18
  19 #include <ctype.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 #include "out.h"
  24
  25
  26 /*
  27  * Convert a `scaling unit' to a consistent form, or fail.  Scaling
  28  * units are documented in groff.7, which stipulates the following:
  29  *
  30  *  (1) A scaling unit is a signed/unsigned integer/float with or
  31  *      without a unit.
  32  *
  33  *  (2) The following units exist:
  34  *      c       Centimeter
  35  *      i       Inch
  36  *      P       Pica = 1/6 inch
  37  *      p       Point = 1/72 inch
  38  *      m       Em = the font size in points (width of letter m)
  39  *      M       100th of an Em
  40  *      n       En = Em/2
  41  *      u       Basic unit for actual output device
  42  *      v       Vertical line space in basic units scaled point =
  43  *              1/sizescale of a point (defined in font DESC file)
  44  *      f       Scale by 65536.
  45  */
  46 int
  47 a2roffsu(const char *src, struct roffsu *dst)
  48 {
  49         char             buf[BUFSIZ], hasd;
  50         int              i;
  51         enum roffscale   unit;
  52
  53         i = hasd = 0;
  54
  55         switch (*src) {
  56         case ('+'):
  57                 src++;
  58                 break;
  59         case ('-'):
  60                 buf[i++] = *src++;
  61                 break;
  62         default:
  63                 break;
  64         }
  65
  66         while (i < BUFSIZ) {
  67                 if ( ! isdigit((u_char)*src)) {
  68                         if ('.' != *src)
  69                                 break;
  70                         else if (hasd)
  71                                 break;
  72                         else
  73                                 hasd = 1;
  74                 }
  75                 buf[i++] = *src++;
  76         }
  77
  78         if (BUFSIZ == i || (*src && *(src + 1)))
  79                 return(0);
  80
  81         buf[i] = '\0';
  82
  83         switch (*src) {
  84         case ('c'):
  85                 unit = SCALE_CM;
  86                 break;
  87         case ('i'):
  88                 unit = SCALE_IN;
  89                 break;
  90         case ('P'):
  91                 unit = SCALE_PC;
  92                 break;
  93         case ('p'):
  94                 unit = SCALE_PT;
  95                 break;
  96         case ('f'):
  97                 unit = SCALE_FS;
  98                 break;
  99         case ('v'):
 100                 unit = SCALE_VS;
 101                 break;
 102         case ('m'):
 103                 unit = SCALE_EM;
 104                 break;
 105         case ('\0'):
 106                 /* FALLTHROUGH */
 107         case ('u'):
 108                 unit = SCALE_BU;
 109                 break;
 110         case ('M'):
 111                 unit = SCALE_MM;
 112                 break;
 113         case ('n'):
 114                 unit = SCALE_EN;
 115                 break;
 116         default:
 117                 return(0);
 118         }
 119
 120         if ((dst->scale = atof(buf)) < 0)
 121                 dst->scale = 0;
 122         dst->unit = unit;
 123         dst->pt = hasd;
 124
 125         return(1);
 126 }