out.c

   1 /* generating troff output */
   2 #include <ctype.h>
   3 #include <stdarg.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include "roff.h"
   8
   9 static int out_nl = 1;
  10
  11 /* output troff code; newlines may appear only at the end of s */
  12 static void out_out(char *s, va_list ap)
  13 {
  14         out_nl = strchr(s, '\n') != NULL;
  15         vfprintf(stdout, s, ap);
  16 }
  17
  18 /* output troff code; no preceding newline is necessary */
  19 static void outnn(char *s, ...)
  20 {
  21         va_list ap;
  22         va_start(ap, s);
  23         out_out(s, ap);
  24         va_end(ap);
  25 }
  26
  27 /* output troff cmd; should appear after a newline */
  28 void out(char *s, ...)
  29 {
  30         va_list ap;
  31         if (!out_nl)
  32                 outnn("\n");
  33         va_start(ap, s);
  34         out_out(s, ap);
  35         va_end(ap);
  36 }
  37
  38 static int o_s = 10;
  39 static int o_f = 1;
  40 static int o_m = 0;
  41
  42 static void out_ps(int n)
  43 {
  44         if (o_s != n) {
  45                 o_s = n;
  46                 out("s%d\n", o_s);
  47         }
  48 }
  49
  50 static void out_ft(int n)
  51 {
  52         if (n >= 0 && o_f != n) {
  53                 o_f = n;
  54                 out("f%d\n", o_f);
  55         }
  56 }
  57
  58 static void out_clr(int n)
  59 {
  60         if (n >= 0 && o_m != n) {
  61                 o_m = n;
  62                 out("m%s\n", clr_str(o_m));
  63         }
  64 }
  65
  66 static int tok_num(char **s, int scale)
  67 {
  68         char tok[ILNLEN];
  69         char *d = tok;
  70         while (isspace(**s))
  71                 (*s)++;
  72         while (**s && !isspace(**s))
  73                 *d++ = *(*s)++;
  74         *d = '\0';
  75         return eval(tok, scale);
  76 }
  77
  78 static void out_draw(char *s)
  79 {
  80         int c = *s++;
  81         out("D%c", c);
  82         switch (tolower(c)) {
  83         case 'l':
  84                 outnn(" %d", tok_num(&s, 'm'));
  85                 outnn(" %d", tok_num(&s, 'v'));
  86                 outnn(" .");                    /* dpost requires this */
  87                 break;
  88         case 'c':
  89                 outnn(" %d", tok_num(&s, 'm'));
  90                 break;
  91         case 'e':
  92                 outnn(" %d", tok_num(&s, 'm'));
  93                 outnn(" %d", tok_num(&s, 'v'));
  94                 break;
  95         case 'a':
  96                 outnn(" %d", tok_num(&s, 'm'));
  97                 outnn(" %d", tok_num(&s, 'v'));
  98                 outnn(" %d", tok_num(&s, 'm'));
  99                 outnn(" %d", tok_num(&s, 'v'));
 100                 break;
 101         case '~':
 102         case 'p':
 103                 outnn(" %d", tok_num(&s, 'm'));
 104                 outnn(" %d", tok_num(&s, 'v'));
 105                 while (*s) {
 106                         outnn(" %d", tok_num(&s, 'm'));
 107                         outnn(" %d", tok_num(&s, 'v'));
 108                 }
 109                 break;
 110         }
 111         outnn("\n");
 112 }
 113
 114 static void outg(char *c, int fn)
 115 {
 116         int ofn = o_f;
 117         out_ft(fn);
 118         if (utf8one(c))
 119                 outnn("c%s%s", c, c[1] ? "\n" : "");
 120         else
 121                 out("C%s\n", c[0] == c_ec && c[1] == '(' ? c + 2 : c);
 122         out_ft(ofn);
 123 }
 124
 125 static void outc(char *c)
 126 {
 127         struct glyph *g = dev_glyph(c, o_f);
 128         int cwid, bwid;
 129         if (!g)
 130                 return;
 131         cwid = charwid(o_f, o_s, g->wid);
 132         bwid = DEVWID(o_s, g->wid);
 133         if (font_mapped(g->font, c))
 134                 c = g->name;
 135         if (dev_getcs(o_f))
 136                 outnn("h%d", (cwid - bwid) / 2);
 137         outg(c, dev_fontpos(g->font));
 138         if (dev_getbd(o_f)) {
 139                 outnn("h%d", dev_getbd(o_f) - 1);
 140                 outg(c, dev_fontpos(g->font));
 141                 outnn("h%d", -dev_getbd(o_f) + 1);
 142         }
 143         if (dev_getcs(o_f))
 144                 outnn("h%d", -(cwid - bwid) / 2);
 145         outnn("h%d", cwid);
 146 }
 147
 148 void out_line(char *s)
 149 {
 150         char c[ILNLEN + GNLEN * 4];
 151         int t;
 152         while ((t = escread(&s, c)) >= 0) {
 153                 if (!t) {
 154                         if (c[0] == c_ni || (c[0] == '\\' && c[1] == '\\')) {
 155                                 c[0] = c[1];
 156                                 c[1] = '\0';
 157                         }
 158                         if (c[0] == '\t' || c[0] == '\x01' ||
 159                                         !strcmp(c_hc, c) || !strcmp(c_bp, c))
 160                                 continue;
 161                         outc(cmap_map(c));
 162                         continue;
 163                 }
 164                 switch (t) {
 165                 case 'D':
 166                         out_draw(c);
 167                         break;
 168                 case 'f':
 169                         out_ft(dev_pos(c));
 170                         break;
 171                 case 'h':
 172                         outnn("h%d", eval(c, 'm'));
 173                         break;
 174                 case 'm':
 175                         if (!n_cp)
 176                                 out_clr(clr_get(c));
 177                         break;
 178                 case 's':
 179                         out_ps(eval_re(c, o_s, '\0'));
 180                         break;
 181                 case 'v':
 182                         outnn("v%d", eval(c, 'v'));
 183                         break;
 184                 case 'X':
 185                         out("x X %s\n", c);
 186                         break;
 187                 }
 188         }
 189 }