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