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, int sz)
 115 {
 116         int ofn = o_f;
 117         int osz = o_s;
 118         out_ft(fn);
 119         out_ps(sz);
 120         if (utf8one(c))
 121                 outnn("c%s%s", c, c[1] ? "\n" : "");
 122         else
 123                 out("C%s\n", c[0] == c_ec && c[1] == '(' ? c + 2 : c);
 124         out_ft(ofn);
 125         out_ps(osz);
 126 }
 127
 128 static void outc(char *c)
 129 {
 130         struct glyph *g = dev_glyph(c, o_f);
 131         struct font *fn = dev_font(o_f);
 132         int cwid, bwid;
 133         if (!g)
 134                 return;
 135         cwid = font_gwid(g->font, dev_font(o_f), o_s, g->wid);
 136         bwid = font_wid(g->font, o_s, g->wid);
 137         if (font_mapped(g->font, c))
 138                 c = g->name;
 139         if (font_getcs(fn))
 140                 outnn("h%d", (cwid - bwid) / 2);
 141         outg(c, dev_fontpos(g->font), font_zoom(g->font, o_s));
 142         if (font_getbd(fn)) {
 143                 outnn("h%d", font_getbd(fn) - 1);
 144                 outg(c, dev_fontpos(g->font), font_zoom(g->font, o_s));
 145                 outnn("h%d", -font_getbd(fn) + 1);
 146         }
 147         if (font_getcs(fn))
 148                 outnn("h%d", -(cwid - bwid) / 2);
 149         outnn("h%d", cwid);
 150 }
 151
 152 void out_line(char *s)
 153 {
 154         char c[ILNLEN + GNLEN * 4];
 155         int t;
 156         while ((t = escread(&s, c)) >= 0) {
 157                 if (!t) {
 158                         if (c[0] == c_ni || (c[0] == '\\' && c[1] == '\\')) {
 159                                 c[0] = c[1];
 160                                 c[1] = '\0';
 161                         }
 162                         if (c[0] == '\t' || c[0] == '\x01' || c_hymark(c))
 163                                 continue;
 164                         outc(cmap_map(c));
 165                         continue;
 166                 }
 167                 switch (t) {
 168                 case 'D':
 169                         out_draw(c);
 170                         break;
 171                 case 'f':
 172                         out_ft(dev_pos(c));
 173                         break;
 174                 case 'h':
 175                         outnn("h%d", eval(c, 'm'));
 176                         break;
 177                 case 'm':
 178                         if (!n_cp)
 179                                 out_clr(clr_get(c));
 180                         break;
 181                 case 's':
 182                         out_ps(eval(c, 0));
 183                         break;
 184                 case 'v':
 185                         outnn("v%d", eval(c, 'v'));
 186                         break;
 187                 case 'X':
 188                         out("x X %s\n", c);
 189                         break;
 190                 }
 191         }
 192 }