out.c

   1 #include <ctype.h>
   2 #include <stdarg.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include "roff.h"
   7
   8 static int out_nl = 1;
   9
  10 /* output troff code; newlines may appear only at the end of s */
  11 static void out_out(char *s, va_list ap)
  12 {
  13         out_nl = strchr(s, '\n') != NULL;
  14         vfprintf(stdout, s, ap);
  15 }
  16
  17 /* output troff code; no preceding newline is necessary */
  18 static void outnn(char *s, ...)
  19 {
  20         va_list ap;
  21         va_start(ap, s);
  22         out_out(s, ap);
  23         va_end(ap);
  24 }
  25
  26 /* output troff cmd; should appear after a newline */
  27 void out(char *s, ...)
  28 {
  29         va_list ap;
  30         if (!out_nl)
  31                 outnn("\n");
  32         va_start(ap, s);
  33         out_out(s, ap);
  34         va_end(ap);
  35 }
  36
  37 static int o_s = 10;
  38 static int o_f = 1;
  39 static int o_m = 0;
  40
  41 static void out_ps(int n)
  42 {
  43         if (o_s != n) {
  44                 o_s = n;
  45                 out("s%d\n", o_s);
  46         }
  47 }
  48
  49 static void out_ft(int n)
  50 {
  51         if (n >= 0 && o_f != n) {
  52                 o_f = n;
  53                 out("f%d\n", o_f);
  54         }
  55 }
  56
  57 static void out_clr(int n)
  58 {
  59         if (n >= 0 && o_m != n) {
  60                 o_m = n;
  61                 out("m%s\n", clr_str(o_m));
  62         }
  63 }
  64
  65 static int tok_num(char **s, int scale)
  66 {
  67         char tok[ILNLEN];
  68         char *d = tok;
  69         while (isspace(**s))
  70                 (*s)++;
  71         while (**s && !isspace(**s))
  72                 *d++ = *(*s)++;
  73         *d = '\0';
  74         return eval(tok, scale);
  75 }
  76
  77 static void out_draw(char *s)
  78 {
  79         int c = *s++;
  80         out("D%c", c);
  81         switch (tolower(c)) {
  82         case 'l':
  83                 outnn(" %d", tok_num(&s, 'm'));
  84                 outnn(" %d", tok_num(&s, 'v'));
  85                 outnn(" .");                    /* dpost requires this */
  86                 break;
  87         case 'c':
  88                 outnn(" %d", tok_num(&s, 'm'));
  89                 break;
  90         case 'e':
  91                 outnn(" %d", tok_num(&s, 'm'));
  92                 outnn(" %d", tok_num(&s, 'v'));
  93                 break;
  94         case 'a':
  95                 outnn(" %d", tok_num(&s, 'm'));
  96                 outnn(" %d", tok_num(&s, 'v'));
  97                 outnn(" %d", tok_num(&s, 'm'));
  98                 outnn(" %d", tok_num(&s, 'v'));
  99                 break;
 100         case '~':
 101         case 'p':
 102                 outnn(" %d", tok_num(&s, 'm'));
 103                 outnn(" %d", tok_num(&s, 'v'));
 104                 while (*s) {
 105                         outnn(" %d", tok_num(&s, 'm'));
 106                         outnn(" %d", tok_num(&s, 'v'));
 107                 }
 108                 break;
 109         }
 110         outnn("\n");
 111 }
 112
 113 static void outg(char *c)
 114 {
 115         if (utf8len((unsigned char) c[0]) == strlen(c))
 116                 outnn("c%s%s", c, c[1] ? "\n" : "");
 117         else
 118                 out("C%s\n", c[0] == c_ec && c[1] == '(' ? c + 2 : c);
 119 }
 120
 121 static void outc(char *c)
 122 {
 123         struct glyph *g = dev_glyph(c, o_f);
 124         int cwid = charwid(o_f, o_s, g ? g->wid : SC_DW);
 125         int bwid = charwid_base(o_f, o_s, g ? g->wid : SC_DW);
 126         if (dev_getcs(o_f))
 127                 outnn("h%d", (cwid - bwid) / 2);
 128         outg(c);
 129         if (dev_getbd(o_f)) {
 130                 outnn("h%d", dev_getbd(o_f) - 1);
 131                 outg(c);
 132                 outnn("h%d", -dev_getbd(o_f) + 1);
 133         }
 134         if (dev_getcs(o_f))
 135                 outnn("h%d", -(cwid - bwid) / 2);
 136         outnn("h%d", cwid);
 137 }
 138
 139 void out_line(char *s)
 140 {
 141         char c[ILNLEN + GNLEN * 4];
 142         int t;
 143         while ((t = escread(&s, c)) >= 0) {
 144                 if (!t) {
 145                         if (c[0] == c_ni || (c[0] == '\\' && c[1] == '\\')) {
 146                                 c[0] = c[1];
 147                                 c[1] = '\0';
 148                         }
 149                         if (c[0] == '\t' || c[0] == '\x01' || !strcmp(c_hc, c))
 150                                 continue;
 151                         outc(tr_map(c));
 152                         continue;
 153                 }
 154                 switch (t) {
 155                 case 'D':
 156                         out_draw(c);
 157                         break;
 158                 case 'f':
 159                         out_ft(dev_pos(c));
 160                         break;
 161                 case 'h':
 162                         outnn("h%d", eval(c, 'm'));
 163                         break;
 164                 case 'm':
 165                         if (!n_cp)
 166                                 out_clr(clr_get(c));
 167                         break;
 168                 case 's':
 169                         out_ps(eval_re(c, o_s, '\0'));
 170                         break;
 171                 case 'v':
 172                         outnn("v%d", eval(c, 'v'));
 173                         break;
 174                 case 'X':
 175                         out("x X %s\n", c);
 176                         break;
 177                 }
 178         }
 179 }