src/tparam.c

   1 /* Merge parameters into a termcap entry string.
   2    Copyright (C) 1985, 87, 93, 95 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2, or (at your option)
   7 any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; see the file COPYING.  If not, write to
  16 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 Boston, MA 02111-1307, USA.  */
  18
  19 /* Emacs config.h may rename various library functions such as malloc.  */
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #ifndef emacs
  25 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
  26 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  27 #endif
  28
  29 #ifdef STDC_HEADERS
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #else
  33 char *malloc ();
  34 char *realloc ();
  35 #endif
  36
  37 #endif /* not emacs */
  38
  39 #ifndef NULL
  40 #define NULL (char *) 0
  41 #endif
  42 \f
  43 #ifndef emacs
  44 static void
  45 memory_out ()
  46 {
  47   write (2, "virtual memory exhausted\n", 25);
  48   exit (1);
  49 }
  50
  51 static char *
  52 xmalloc (size)
  53      unsigned size;
  54 {
  55   register char *tem = malloc (size);
  56
  57   if (!tem)
  58     memory_out ();
  59   return tem;
  60 }
  61
  62 static char *
  63 xrealloc (ptr, size)
  64      char *ptr;
  65      unsigned size;
  66 {
  67   register char *tem = realloc (ptr, size);
  68
  69   if (!tem)
  70     memory_out ();
  71   return tem;
  72 }
  73 #endif /* not emacs */
  74 \f
  75 /* Assuming STRING is the value of a termcap string entry
  76    containing `%' constructs to expand parameters,
  77    merge in parameter values and store result in block OUTSTRING points to.
  78    LEN is the length of OUTSTRING.  If more space is needed,
  79    a block is allocated with `malloc'.
  80
  81    The value returned is the address of the resulting string.
  82    This may be OUTSTRING or may be the address of a block got with `malloc'.
  83    In the latter case, the caller must free the block.
  84
  85    The fourth and following args to tparam serve as the parameter values.  */
  86
  87 static char *tparam1 ();
  88
  89 /* VARARGS 2 */
  90 char *
  91 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  92      char *string;
  93      char *outstring;
  94      int len;
  95      int arg0, arg1, arg2, arg3;
  96 {
  97   int arg[4];
  98
  99   arg[0] = arg0;
 100   arg[1] = arg1;
 101   arg[2] = arg2;
 102   arg[3] = arg3;
 103   return tparam1 (string, outstring, len, NULL, NULL, arg);
 104 }
 105
 106 char *BC;
 107 char *UP;
 108
 109 static char tgoto_buf[50];
 110
 111 char *
 112 tgoto (cm, hpos, vpos)
 113      char *cm;
 114      int hpos, vpos;
 115 {
 116   int args[2];
 117   if (!cm)
 118     return NULL;
 119   args[0] = vpos;
 120   args[1] = hpos;
 121   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 122 }
 123
 124 static char *
 125 tparam1 (string, outstring, len, up, left, argp)
 126      char *string;
 127      char *outstring;
 128      int len;
 129      char *up, *left;
 130      register int *argp;
 131 {
 132   register int c;
 133   register char *p = string;
 134   register char *op = outstring;
 135   char *outend;
 136   int outlen = 0;
 137
 138   register int tem;
 139   int *old_argp = argp;
 140   int doleft = 0;
 141   int doup = 0;
 142
 143   outend = outstring + len;
 144
 145   while (1)
 146     {
 147       /* If the buffer might be too short, make it bigger.  */
 148       if (op + 5 >= outend)
 149         {
 150           register char *new;
 151           if (outlen == 0)
 152             {
 153               outlen = len + 40;
 154               new = (char *) xmalloc (outlen);
 155               outend += 40;
 156               bcopy (outstring, new, op - outstring);
 157             }
 158           else
 159             {
 160               outend += outlen;
 161               outlen *= 2;
 162               new = (char *) xrealloc (outstring, outlen);
 163             }
 164           op += new - outstring;
 165           outend += new - outstring;
 166           outstring = new;
 167         }
 168       c = *p++;
 169       if (!c)
 170         break;
 171       if (c == '%')
 172         {
 173           c = *p++;
 174           tem = *argp;
 175           switch (c)
 176             {
 177             case 'd':           /* %d means output in decimal.  */
 178               if (tem < 10)
 179                 goto onedigit;
 180               if (tem < 100)
 181                 goto twodigit;
 182             case '3':           /* %3 means output in decimal, 3 digits.  */
 183               if (tem > 999)
 184                 {
 185                   *op++ = tem / 1000 + '0';
 186                   tem %= 1000;
 187                 }
 188               *op++ = tem / 100 + '0';
 189             case '2':           /* %2 means output in decimal, 2 digits.  */
 190             twodigit:
 191               tem %= 100;
 192               *op++ = tem / 10 + '0';
 193             onedigit:
 194               *op++ = tem % 10 + '0';
 195               argp++;
 196               break;
 197
 198             case 'C':
 199               /* For c-100: print quotient of value by 96, if nonzero,
 200                  then do like %+.  */
 201               if (tem >= 96)
 202                 {
 203                   *op++ = tem / 96;
 204                   tem %= 96;
 205                 }
 206             case '+':           /* %+x means add character code of char x.  */
 207               tem += *p++;
 208             case '.':           /* %. means output as character.  */
 209               if (left)
 210                 {
 211                   /* If want to forbid output of 0 and \n and \t,
 212                      and this is one of them, increment it.  */
 213                   while (tem == 0 || tem == '\n' || tem == '\t')
 214                     {
 215                       tem++;
 216                       if (argp == old_argp)
 217                         doup++, outend -= strlen (up);
 218                       else
 219                         doleft++, outend -= strlen (left);
 220                     }
 221                 }
 222               *op++ = tem ? tem : 0200;
 223             case 'f':           /* %f means discard next arg.  */
 224               argp++;
 225               break;
 226
 227             case 'b':           /* %b means back up one arg (and re-use it).  */
 228               argp--;
 229               break;
 230
 231             case 'r':           /* %r means interchange following two args.  */
 232               argp[0] = argp[1];
 233               argp[1] = tem;
 234               old_argp++;
 235               break;
 236
 237             case '>':           /* %>xy means if arg is > char code of x, */
 238               if (argp[0] > *p++) /* then add char code of y to the arg, */
 239                 argp[0] += *p;  /* and in any case don't output.  */
 240               p++;              /* Leave the arg to be output later.  */
 241               break;
 242
 243             case 'a':           /* %a means arithmetic.  */
 244               /* Next character says what operation.
 245                  Add or subtract either a constant or some other arg.  */
 246               /* First following character is + to add or - to subtract
 247                  or = to assign.  */
 248               /* Next following char is 'p' and an arg spec
 249                  (0100 plus position of that arg relative to this one)
 250                  or 'c' and a constant stored in a character.  */
 251               tem = p[2] & 0177;
 252               if (p[1] == 'p')
 253                 tem = argp[tem - 0100];
 254               if (p[0] == '-')
 255                 argp[0] -= tem;
 256               else if (p[0] == '+')
 257                 argp[0] += tem;
 258               else if (p[0] == '*')
 259                 argp[0] *= tem;
 260               else if (p[0] == '/')
 261                 argp[0] /= tem;
 262               else
 263                 argp[0] = tem;
 264
 265               p += 3;
 266               break;
 267
 268             case 'i':           /* %i means add one to arg, */
 269               argp[0] ++;       /* and leave it to be output later.  */
 270               argp[1] ++;       /* Increment the following arg, too!  */
 271               break;
 272
 273             case '%':           /* %% means output %; no arg.  */
 274               goto ordinary;
 275
 276             case 'n':           /* %n means xor each of next two args with 140.  */
 277               argp[0] ^= 0140;
 278               argp[1] ^= 0140;
 279               break;
 280
 281             case 'm':           /* %m means xor each of next two args with 177.  */
 282               argp[0] ^= 0177;
 283               argp[1] ^= 0177;
 284               break;
 285
 286             case 'B':           /* %B means express arg as BCD char code.  */
 287               argp[0] += 6 * (tem / 10);
 288               break;
 289
 290             case 'D':           /* %D means weird Delta Data transformation.  */
 291               argp[0] -= 2 * (tem % 16);
 292               break;
 293
 294             default:
 295               abort ();
 296             }
 297         }
 298       else
 299         /* Ordinary character in the argument string.  */
 300       ordinary:
 301         *op++ = c;
 302     }
 303   *op = 0;
 304   while (doup-- > 0)
 305     strcat (op, up);
 306   while (doleft-- > 0)
 307     strcat (op, left);
 308   return outstring;
 309 }
 310 \f
 311 #ifdef DEBUG
 312
 313 main (argc, argv)
 314      int argc;
 315      char **argv;
 316 {
 317   char buf[50];
 318   int args[3];
 319   args[0] = atoi (argv[2]);
 320   args[1] = atoi (argv[3]);
 321   args[2] = atoi (argv[4]);
 322   tparam1 (argv[1], buf, "LEFT", "UP", args);
 323   printf ("%s\n", buf);
 324   return 0;
 325 }
 326
 327 #endif /* DEBUG */