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 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
  28 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  29 #endif
  30
  31 #ifdef STDC_HEADERS
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #else
  35 char *malloc ();
  36 char *realloc ();
  37 #endif
  38
  39 #endif /* not emacs */
  40
  41 #ifndef NULL
  42 #define NULL (char *) 0
  43 #endif
  44 \f
  45 #ifndef emacs
  46 static void
  47 memory_out ()
  48 {
  49   write (2, "virtual memory exhausted\n", 25);
  50   exit (1);
  51 }
  52
  53 static char *
  54 xmalloc (size)
  55      unsigned size;
  56 {
  57   register char *tem = malloc (size);
  58
  59   if (!tem)
  60     memory_out ();
  61   return tem;
  62 }
  63
  64 static char *
  65 xrealloc (ptr, size)
  66      char *ptr;
  67      unsigned size;
  68 {
  69   register char *tem = realloc (ptr, size);
  70
  71   if (!tem)
  72     memory_out ();
  73   return tem;
  74 }
  75 #endif /* not emacs */
  76 \f
  77 /* Assuming STRING is the value of a termcap string entry
  78    containing `%' constructs to expand parameters,
  79    merge in parameter values and store result in block OUTSTRING points to.
  80    LEN is the length of OUTSTRING.  If more space is needed,
  81    a block is allocated with `malloc'.
  82
  83    The value returned is the address of the resulting string.
  84    This may be OUTSTRING or may be the address of a block got with `malloc'.
  85    In the latter case, the caller must free the block.
  86
  87    The fourth and following args to tparam serve as the parameter values.  */
  88
  89 static char *tparam1 ();
  90
  91 /* VARARGS 2 */
  92 char *
  93 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  94      char *string;
  95      char *outstring;
  96      int len;
  97      int arg0, arg1, arg2, arg3;
  98 {
  99   int arg[4];
 100
 101   arg[0] = arg0;
 102   arg[1] = arg1;
 103   arg[2] = arg2;
 104   arg[3] = arg3;
 105   return tparam1 (string, outstring, len, NULL, NULL, arg);
 106 }
 107
 108 char *BC;
 109 char *UP;
 110
 111 static char tgoto_buf[50];
 112
 113 char *
 114 tgoto (cm, hpos, vpos)
 115      char *cm;
 116      int hpos, vpos;
 117 {
 118   int args[2];
 119   if (!cm)
 120     return NULL;
 121   args[0] = vpos;
 122   args[1] = hpos;
 123   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 124 }
 125
 126 static char *
 127 tparam1 (string, outstring, len, up, left, argp)
 128      char *string;
 129      char *outstring;
 130      int len;
 131      char *up, *left;
 132      register int *argp;
 133 {
 134   register int c;
 135   register char *p = string;
 136   register char *op = outstring;
 137   char *outend;
 138   int outlen = 0;
 139
 140   register int tem;
 141   int *old_argp = argp;
 142   int doleft = 0;
 143   int doup = 0;
 144
 145   outend = outstring + len;
 146
 147   while (1)
 148     {
 149       /* If the buffer might be too short, make it bigger.  */
 150       if (op + 5 >= outend)
 151         {
 152           register char *new;
 153           int offset = op - outstring;
 154
 155           if (outlen == 0)
 156             {
 157               outlen = len + 40;
 158               new = (char *) xmalloc (outlen);
 159               bcopy (outstring, new, offset);
 160             }
 161           else
 162             {
 163               outlen *= 2;
 164               new = (char *) xrealloc (outstring, outlen);
 165             }
 166
 167           op = new + offset;
 168           outend = new + outlen;
 169           outstring = new;
 170         }
 171       c = *p++;
 172       if (!c)
 173         break;
 174       if (c == '%')
 175         {
 176           c = *p++;
 177           tem = *argp;
 178           switch (c)
 179             {
 180             case 'd':           /* %d means output in decimal.  */
 181               if (tem < 10)
 182                 goto onedigit;
 183               if (tem < 100)
 184                 goto twodigit;
 185             case '3':           /* %3 means output in decimal, 3 digits.  */
 186               if (tem > 999)
 187                 {
 188                   *op++ = tem / 1000 + '0';
 189                   tem %= 1000;
 190                 }
 191               *op++ = tem / 100 + '0';
 192             case '2':           /* %2 means output in decimal, 2 digits.  */
 193             twodigit:
 194               tem %= 100;
 195               *op++ = tem / 10 + '0';
 196             onedigit:
 197               *op++ = tem % 10 + '0';
 198               argp++;
 199               break;
 200
 201             case 'C':
 202               /* For c-100: print quotient of value by 96, if nonzero,
 203                  then do like %+.  */
 204               if (tem >= 96)
 205                 {
 206                   *op++ = tem / 96;
 207                   tem %= 96;
 208                 }
 209             case '+':           /* %+x means add character code of char x.  */
 210               tem += *p++;
 211             case '.':           /* %. means output as character.  */
 212               if (left)
 213                 {
 214                   /* If want to forbid output of 0 and \n and \t,
 215                      and this is one of them, increment it.  */
 216                   while (tem == 0 || tem == '\n' || tem == '\t')
 217                     {
 218                       tem++;
 219                       if (argp == old_argp)
 220                         doup++, outend -= strlen (up);
 221                       else
 222                         doleft++, outend -= strlen (left);
 223                     }
 224                 }
 225               *op++ = tem ? tem : 0200;
 226             case 'f':           /* %f means discard next arg.  */
 227               argp++;
 228               break;
 229
 230             case 'b':           /* %b means back up one arg (and re-use it).  */
 231               argp--;
 232               break;
 233
 234             case 'r':           /* %r means interchange following two args.  */
 235               argp[0] = argp[1];
 236               argp[1] = tem;
 237               old_argp++;
 238               break;
 239
 240             case '>':           /* %>xy means if arg is > char code of x, */
 241               if (argp[0] > *p++) /* then add char code of y to the arg, */
 242                 argp[0] += *p;  /* and in any case don't output.  */
 243               p++;              /* Leave the arg to be output later.  */
 244               break;
 245
 246             case 'a':           /* %a means arithmetic.  */
 247               /* Next character says what operation.
 248                  Add or subtract either a constant or some other arg.  */
 249               /* First following character is + to add or - to subtract
 250                  or = to assign.  */
 251               /* Next following char is 'p' and an arg spec
 252                  (0100 plus position of that arg relative to this one)
 253                  or 'c' and a constant stored in a character.  */
 254               tem = p[2] & 0177;
 255               if (p[1] == 'p')
 256                 tem = argp[tem - 0100];
 257               if (p[0] == '-')
 258                 argp[0] -= tem;
 259               else 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
 266                 argp[0] = tem;
 267
 268               p += 3;
 269               break;
 270
 271             case 'i':           /* %i means add one to arg, */
 272               argp[0] ++;       /* and leave it to be output later.  */
 273               argp[1] ++;       /* Increment the following arg, too!  */
 274               break;
 275
 276             case '%':           /* %% means output %; no arg.  */
 277               goto ordinary;
 278
 279             case 'n':           /* %n means xor each of next two args with 140.  */
 280               argp[0] ^= 0140;
 281               argp[1] ^= 0140;
 282               break;
 283
 284             case 'm':           /* %m means xor each of next two args with 177.  */
 285               argp[0] ^= 0177;
 286               argp[1] ^= 0177;
 287               break;
 288
 289             case 'B':           /* %B means express arg as BCD char code.  */
 290               argp[0] += 6 * (tem / 10);
 291               break;
 292
 293             case 'D':           /* %D means weird Delta Data transformation.  */
 294               argp[0] -= 2 * (tem % 16);
 295               break;
 296
 297             default:
 298               abort ();
 299             }
 300         }
 301       else
 302         /* Ordinary character in the argument string.  */
 303       ordinary:
 304         *op++ = c;
 305     }
 306   *op = 0;
 307   while (doup-- > 0)
 308     strcat (op, up);
 309   while (doleft-- > 0)
 310     strcat (op, left);
 311   return outstring;
 312 }
 313 \f
 314 #ifdef DEBUG
 315
 316 main (argc, argv)
 317      int argc;
 318      char **argv;
 319 {
 320   char buf[50];
 321   int args[3];
 322   args[0] = atoi (argv[2]);
 323   args[1] = atoi (argv[3]);
 324   args[2] = atoi (argv[4]);
 325   tparam1 (argv[1], buf, "LEFT", "UP", args);
 326   printf ("%s\n", buf);
 327   return 0;
 328 }
 329
 330 #endif /* DEBUG */