out.c

   1 /*      $Id: out.c,v 1.3 2009/10/07 12:35:24 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], *p;
  50         int              i;
  51         enum roffscale   unit;
  52
  53         for (p = buf, i = 0; i < BUFSIZ && isdigit((u_char)*src); i++)
  54                 *p++ = *src++;
  55
  56         if (BUFSIZ == i || (*src && *(src + 1)))
  57                 return(0);
  58
  59         *p = '\0';
  60
  61         switch (*src) {
  62         case ('c'):
  63                 unit = SCALE_CM;
  64                 break;
  65         case ('i'):
  66                 unit = SCALE_IN;
  67                 break;
  68         case ('P'):
  69                 unit = SCALE_PC;
  70                 break;
  71         case ('p'):
  72                 unit = SCALE_PT;
  73                 break;
  74         case ('f'):
  75                 unit = SCALE_FS;
  76                 break;
  77         case ('v'):
  78                 unit = SCALE_VS;
  79                 break;
  80         case ('m'):
  81                 unit = SCALE_EM;
  82                 break;
  83         case ('\0'):
  84                 /* FALLTHROUGH */
  85         case ('u'):
  86                 unit = SCALE_BU;
  87                 break;
  88         case ('M'):
  89                 unit = SCALE_MM;
  90                 break;
  91         case ('n'):
  92                 unit = SCALE_EN;
  93                 break;
  94         default:
  95                 return(0);
  96         }
  97
  98         if ((dst->scale = atoi(buf)) < 0)
  99                 dst->scale = 0;
 100         dst->unit = unit;
 101         return(1);
 102 }