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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Emacs config.h may rename various library functions such as malloc.  */
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #ifndef emacs
  24 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
  25 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  26 #endif
  27
  28 #ifdef STDC_HEADERS
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #else
  32 char *malloc ();
  33 char *realloc ();
  34 #endif
  35
  36 #endif /* not emacs */
  37
  38 #ifndef NULL
  39 #define NULL (char *) 0
  40 #endif
  41 \f
  42 #ifndef emacs
  43 static void
  44 memory_out ()
  45 {
  46   write (2, "virtual memory exhausted\n", 25);
  47   exit (1);
  48 }
  49
  50 static char *
  51 xmalloc (size)
  52      unsigned size;
  53 {
  54   register char *tem = malloc (size);
  55
  56   if (!tem)
  57     memory_out ();
  58   return tem;
  59 }
  60
  61 static char *
  62 xrealloc (ptr, size)
  63      char *ptr;
  64      unsigned size;
  65 {
  66   register char *tem = realloc (ptr, size);
  67
  68   if (!tem)
  69     memory_out ();
  70   return tem;
  71 }
  72 #endif /* not emacs */
  73 \f
  74 /* Assuming STRING is the value of a termcap string entry
  75    containing `%' constructs to expand parameters,
  76    merge in parameter values and store result in block OUTSTRING points to.
  77    LEN is the length of OUTSTRING.  If more space is needed,
  78    a block is allocated with `malloc'.
  79
  80    The value returned is the address of the resulting string.
  81    This may be OUTSTRING or may be the address of a block got with `malloc'.
  82    In the latter case, the caller must free the block.
  83
  84    The fourth and following args to tparam serve as the parameter values.  */
  85
  86 static char *tparam1 ();
  87
  88 /* VARARGS 2 */
  89 char *
  90 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  91      char *string;
  92      char *outstring;
  93      int len;
  94      int arg0, arg1, arg2, arg3;
  95 {
  96   int arg[4];
  97
  98   arg[0] = arg0;
  99   arg[1] = arg1;
 100   arg[2] = arg2;
 101   arg[3] = arg3;
 102   return tparam1 (string, outstring, len, NULL, NULL, arg);
 103 }
 104
 105 char *BC;
 106 char *UP;
 107
 108 static char tgoto_buf[50];
 109
 110 char *
 111 tgoto (cm, hpos, vpos)
 112      char *cm;
 113      int hpos, vpos;
 114 {
 115   int args[2];
 116   if (!cm)
 117     return NULL;
 118   args[0] = vpos;
 119   args[1] = hpos;
 120   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 121 }
 122
 123 static char *
 124 tparam1 (string, outstring, len, up, left, argp)
 125      char *string;
 126      char *outstring;
 127      int len;
 128      char *up, *left;
 129      register int *argp;
 130 {
 131   register int c;
 132   register char *p = string;
 133   register char *op = outstring;
 134   char *outend;
 135   int outlen = 0;
 136
 137   register int tem;
 138   int *old_argp = argp;
 139   int doleft = 0;
 140   int doup = 0;
 141
 142   outend = outstring + len;
 143
 144   while (1)
 145     {
 146       /* If the buffer might be too short, make it bigger.  */
 147       if (op + 5 >= outend)
 148         {
 149           register char *new;
 150           if (outlen == 0)
 151             {
 152               outlen = len + 40;
 153               new = (char *) xmalloc (outlen);
 154               outend += 40;
 155               bcopy (outstring, new, op - outstring);
 156             }
 157           else
 158             {
 159               outend += outlen;
 160               outlen *= 2;
 161               new = (char *) xrealloc (outstring, outlen);
 162             }
 163           op += new - outstring;
 164           outend += new - outstring;
 165           outstring = new;
 166         }
 167       c = *p++;
 168       if (!c)
 169         break;
 170       if (c == '%')
 171         {
 172           c = *p++;
 173           tem = *argp;
 174           switch (c)
 175             {
 176             case 'd':           /* %d means output in decimal.  */
 177               if (tem < 10)
 178                 goto onedigit;
 179               if (tem < 100)
 180                 goto twodigit;
 181             case '3':           /* %3 means output in decimal, 3 digits.  */
 182               if (tem > 999)
 183                 {
 184                   *op++ = tem / 1000 + '0';
 185                   tem %= 1000;
 186                 }
 187               *op++ = tem / 100 + '0';
 188             case '2':           /* %2 means output in decimal, 2 digits.  */
 189             twodigit:
 190               tem %= 100;
 191               *op++ = tem / 10 + '0';
 192             onedigit:
 193               *op++ = tem % 10 + '0';
 194               argp++;
 195               break;
 196
 197             case 'C':
 198               /* For c-100: print quotient of value by 96, if nonzero,
 199                  then do like %+.  */
 200               if (tem >= 96)
 201                 {
 202                   *op++ = tem / 96;
 203                   tem %= 96;
 204                 }
 205             case '+':           /* %+x means add character code of char x.  */
 206               tem += *p++;
 207             case '.':           /* %. means output as character.  */
 208               if (left)
 209                 {
 210                   /* If want to forbid output of 0 and \n and \t,
 211                      and this is one of them, increment it.  */
 212                   while (tem == 0 || tem == '\n' || tem == '\t')
 213                     {
 214                       tem++;
 215                       if (argp == old_argp)
 216                         doup++, outend -= strlen (up);
 217                       else
 218                         doleft++, outend -= strlen (left);
 219                     }
 220                 }
 221               *op++ = tem ? tem : 0200;
 222             case 'f':           /* %f means discard next arg.  */
 223               argp++;
 224               break;
 225
 226             case 'b':           /* %b means back up one arg (and re-use it).  */
 227               argp--;
 228               break;
 229
 230             case 'r':           /* %r means interchange following two args.  */
 231               argp[0] = argp[1];
 232               argp[1] = tem;
 233               old_argp++;
 234               break;
 235
 236             case '>':           /* %>xy means if arg is > char code of x, */
 237               if (argp[0] > *p++) /* then add char code of y to the arg, */
 238                 argp[0] += *p;  /* and in any case don't output.  */
 239               p++;              /* Leave the arg to be output later.  */
 240               break;
 241
 242             case 'a':           /* %a means arithmetic.  */
 243               /* Next character says what operation.
 244                  Add or subtract either a constant or some other arg.  */
 245               /* First following character is + to add or - to subtract
 246                  or = to assign.  */
 247               /* Next following char is 'p' and an arg spec
 248                  (0100 plus position of that arg relative to this one)
 249                  or 'c' and a constant stored in a character.  */
 250               tem = p[2] & 0177;
 251               if (p[1] == 'p')
 252                 tem = argp[tem - 0100];
 253               if (p[0] == '-')
 254                 argp[0] -= tem;
 255               else if (p[0] == '+')
 256                 argp[0] += tem;
 257               else if (p[0] == '*')
 258                 argp[0] *= tem;
 259               else if (p[0] == '/')
 260                 argp[0] /= tem;
 261               else
 262                 argp[0] = tem;
 263
 264               p += 3;
 265               break;
 266
 267             case 'i':           /* %i means add one to arg, */
 268               argp[0] ++;       /* and leave it to be output later.  */
 269               argp[1] ++;       /* Increment the following arg, too!  */
 270               break;
 271
 272             case '%':           /* %% means output %; no arg.  */
 273               goto ordinary;
 274
 275             case 'n':           /* %n means xor each of next two args with 140.  */
 276               argp[0] ^= 0140;
 277               argp[1] ^= 0140;
 278               break;
 279
 280             case 'm':           /* %m means xor each of next two args with 177.  */
 281               argp[0] ^= 0177;
 282               argp[1] ^= 0177;
 283               break;
 284
 285             case 'B':           /* %B means express arg as BCD char code.  */
 286               argp[0] += 6 * (tem / 10);
 287               break;
 288
 289             case 'D':           /* %D means weird Delta Data transformation.  */
 290               argp[0] -= 2 * (tem % 16);
 291               break;
 292             }
 293         }
 294       else
 295         /* Ordinary character in the argument string.  */
 296       ordinary:
 297         *op++ = c;
 298     }
 299   *op = 0;
 300   while (doup-- > 0)
 301     strcat (op, up);
 302   while (doleft-- > 0)
 303     strcat (op, left);
 304   return outstring;
 305 }
 306 \f
 307 #ifdef DEBUG
 308
 309 main (argc, argv)
 310      int argc;
 311      char **argv;
 312 {
 313   char buf[50];
 314   int args[3];
 315   args[0] = atoi (argv[2]);
 316   args[1] = atoi (argv[3]);
 317   args[2] = atoi (argv[4]);
 318   tparam1 (argv[1], buf, "LEFT", "UP", args);
 319   printf ("%s\n", buf);
 320   return 0;
 321 }
 322
 323 #endif /* DEBUG */