code.delx.au - gnu-emacs/blob - src/tparam.c

   1 /* Merge parameters into a termcap entry string.
   2    Copyright (C) 1985, 87, 93, 95, 2000 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 #ifdef emacs
  25 #include "lisp.h"               /* for xmalloc */
  26 #else
  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 /* Do this after the include, in case string.h prototypes bcopy.  */
  37 #if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
  38 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  39 #endif
  40
  41 #endif /* not emacs */
  42
  43 #ifndef NULL
  44 #define NULL (char *) 0
  45 #endif
  46 \f
  47 #ifndef emacs
  48 static void
  49 memory_out ()
  50 {
  51   write (2, "virtual memory exhausted\n", 25);
  52   exit (1);
  53 }
  54
  55 static char *
  56 xmalloc (size)
  57      unsigned size;
  58 {
  59   register char *tem = malloc (size);
  60
  61   if (!tem)
  62     memory_out ();
  63   return tem;
  64 }
  65
  66 static char *
  67 xrealloc (ptr, size)
  68      char *ptr;
  69      unsigned size;
  70 {
  71   register char *tem = realloc (ptr, size);
  72
  73   if (!tem)
  74     memory_out ();
  75   return tem;
  76 }
  77 #endif /* not emacs */
  78 \f
  79 /* Assuming STRING is the value of a termcap string entry
  80    containing `%' constructs to expand parameters,
  81    merge in parameter values and store result in block OUTSTRING points to.
  82    LEN is the length of OUTSTRING.  If more space is needed,
  83    a block is allocated with `malloc'.
  84
  85    The value returned is the address of the resulting string.
  86    This may be OUTSTRING or may be the address of a block got with `malloc'.
  87    In the latter case, the caller must free the block.
  88
  89    The fourth and following args to tparam serve as the parameter values.  */
  90
  91 static char *tparam1 ();
  92
  93 /* VARARGS 2 */
  94 char *
  95 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  96      char *string;
  97      char *outstring;
  98      int len;
  99      int arg0, arg1, arg2, arg3;
 100 {
 101   int arg[4];
 102
 103   arg[0] = arg0;
 104   arg[1] = arg1;
 105   arg[2] = arg2;
 106   arg[3] = arg3;
 107   return tparam1 (string, outstring, len, NULL, NULL, arg);
 108 }
 109
 110 char *BC;
 111 char *UP;
 112
 113 static char tgoto_buf[50];
 114
 115 char *
 116 tgoto (cm, hpos, vpos)
 117      char *cm;
 118      int hpos, vpos;
 119 {
 120   int args[2];
 121   if (!cm)
 122     return NULL;
 123   args[0] = vpos;
 124   args[1] = hpos;
 125   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 126 }
 127
 128 static char *
 129 tparam1 (string, outstring, len, up, left, argp)
 130      char *string;
 131      char *outstring;
 132      int len;
 133      char *up, *left;
 134      register int *argp;
 135 {
 136   register int c;
 137   register char *p = string;
 138   register char *op = outstring;
 139   char *outend;
 140   int outlen = 0;
 141
 142   register int tem;
 143   int *old_argp = argp;
 144   int doleft = 0;
 145   int doup = 0;
 146
 147   outend = outstring + len;
 148
 149   while (1)
 150     {
 151       /* If the buffer might be too short, make it bigger.  */
 152       if (op + 5 >= outend)
 153         {
 154           register char *new;
 155           int offset = op - outstring;
 156
 157           if (outlen == 0)
 158             {
 159               outlen = len + 40;
 160               new = (char *) xmalloc (outlen);
 161               bcopy (outstring, new, offset);
 162             }
 163           else
 164             {
 165               outlen *= 2;
 166               new = (char *) xrealloc (outstring, outlen);
 167             }
 168
 169           op = new + offset;
 170           outend = new + outlen;
 171           outstring = new;
 172         }
 173       c = *p++;
 174       if (!c)
 175         break;
 176       if (c == '%')
 177         {
 178           c = *p++;
 179           tem = *argp;
 180           switch (c)
 181             {
 182             case 'd':           /* %d means output in decimal.  */
 183               if (tem < 10)
 184                 goto onedigit;
 185               if (tem < 100)
 186                 goto twodigit;
 187             case '3':           /* %3 means output in decimal, 3 digits.  */
 188               if (tem > 999)
 189                 {
 190                   *op++ = tem / 1000 + '0';
 191                   tem %= 1000;
 192                 }
 193               *op++ = tem / 100 + '0';
 194             case '2':           /* %2 means output in decimal, 2 digits.  */
 195             twodigit:
 196               tem %= 100;
 197               *op++ = tem / 10 + '0';
 198             onedigit:
 199               *op++ = tem % 10 + '0';
 200               argp++;
 201               break;
 202
 203             case 'C':
 204               /* For c-100: print quotient of value by 96, if nonzero,
 205                  then do like %+.  */
 206               if (tem >= 96)
 207                 {
 208                   *op++ = tem / 96;
 209                   tem %= 96;
 210                 }
 211             case '+':           /* %+x means add character code of char x.  */
 212               tem += *p++;
 213             case '.':           /* %. means output as character.  */
 214               if (left)
 215                 {
 216                   /* If want to forbid output of 0 and \n and \t,
 217                      and this is one of them, increment it.  */
 218                   while (tem == 0 || tem == '\n' || tem == '\t')
 219                     {
 220                       tem++;
 221                       if (argp == old_argp)
 222                         doup++, outend -= strlen (up);
 223                       else
 224                         doleft++, outend -= strlen (left);
 225                     }
 226                 }
 227               *op++ = tem ? tem : 0200;
 228             case 'f':           /* %f means discard next arg.  */
 229               argp++;
 230               break;
 231
 232             case 'b':           /* %b means back up one arg (and re-use it).  */
 233               argp--;
 234               break;
 235
 236             case 'r':           /* %r means interchange following two args.  */
 237               argp[0] = argp[1];
 238               argp[1] = tem;
 239               old_argp++;
 240               break;
 241
 242             case '>':           /* %>xy means if arg is > char code of x, */
 243               if (argp[0] > *p++) /* then add char code of y to the arg, */
 244                 argp[0] += *p;  /* and in any case don't output.  */
 245               p++;              /* Leave the arg to be output later.  */
 246               break;
 247
 248             case 'a':           /* %a means arithmetic.  */
 249               /* Next character says what operation.
 250                  Add or subtract either a constant or some other arg.  */
 251               /* First following character is + to add or - to subtract
 252                  or = to assign.  */
 253               /* Next following char is 'p' and an arg spec
 254                  (0100 plus position of that arg relative to this one)
 255                  or 'c' and a constant stored in a character.  */
 256               tem = p[2] & 0177;
 257               if (p[1] == 'p')
 258                 tem = argp[tem - 0100];
 259               if (p[0] == '-')
 260                 argp[0] -= tem;
 261               else if (p[0] == '+')
 262                 argp[0] += tem;
 263               else if (p[0] == '*')
 264                 argp[0] *= tem;
 265               else if (p[0] == '/')
 266                 argp[0] /= tem;
 267               else
 268                 argp[0] = tem;
 269
 270               p += 3;
 271               break;
 272
 273             case 'i':           /* %i means add one to arg, */
 274               argp[0] ++;       /* and leave it to be output later.  */
 275               argp[1] ++;       /* Increment the following arg, too!  */
 276               break;
 277
 278             case '%':           /* %% means output %; no arg.  */
 279               goto ordinary;
 280
 281             case 'n':           /* %n means xor each of next two args with 140.  */
 282               argp[0] ^= 0140;
 283               argp[1] ^= 0140;
 284               break;
 285
 286             case 'm':           /* %m means xor each of next two args with 177.  */
 287               argp[0] ^= 0177;
 288               argp[1] ^= 0177;
 289               break;
 290
 291             case 'B':           /* %B means express arg as BCD char code.  */
 292               argp[0] += 6 * (tem / 10);
 293               break;
 294
 295             case 'D':           /* %D means weird Delta Data transformation.  */
 296               argp[0] -= 2 * (tem % 16);
 297               break;
 298
 299             default:
 300               abort ();
 301             }
 302         }
 303       else
 304         /* Ordinary character in the argument string.  */
 305       ordinary:
 306         *op++ = c;
 307     }
 308   *op = 0;
 309   while (doup-- > 0)
 310     strcat (op, up);
 311   while (doleft-- > 0)
 312     strcat (op, left);
 313   return outstring;
 314 }
 315 \f
 316 #ifdef DEBUG
 317
 318 main (argc, argv)
 319      int argc;
 320      char **argv;
 321 {
 322   char buf[50];
 323   int args[3];
 324   args[0] = atoi (argv[2]);
 325   args[1] = atoi (argv[3]);
 326   args[2] = atoi (argv[4]);
 327   tparam1 (argv[1], buf, "LEFT", "UP", args);
 328   printf ("%s\n", buf);
 329   return 0;
 330 }
 331
 332 #endif /* DEBUG */