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 #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           if (outlen == 0)
 154             {
 155               outlen = len + 40;
 156               new = (char *) xmalloc (outlen);
 157               outend += 40;
 158               bcopy (outstring, new, op - outstring);
 159             }
 160           else
 161             {
 162               outend += outlen;
 163               outlen *= 2;
 164               new = (char *) xrealloc (outstring, outlen);
 165             }
 166           op += new - outstring;
 167           outend += new - outstring;
 168           outstring = new;
 169         }
 170       c = *p++;
 171       if (!c)
 172         break;
 173       if (c == '%')
 174         {
 175           c = *p++;
 176           tem = *argp;
 177           switch (c)
 178             {
 179             case 'd':           /* %d means output in decimal.  */
 180               if (tem < 10)
 181                 goto onedigit;
 182               if (tem < 100)
 183                 goto twodigit;
 184             case '3':           /* %3 means output in decimal, 3 digits.  */
 185               if (tem > 999)
 186                 {
 187                   *op++ = tem / 1000 + '0';
 188                   tem %= 1000;
 189                 }
 190               *op++ = tem / 100 + '0';
 191             case '2':           /* %2 means output in decimal, 2 digits.  */
 192             twodigit:
 193               tem %= 100;
 194               *op++ = tem / 10 + '0';
 195             onedigit:
 196               *op++ = tem % 10 + '0';
 197               argp++;
 198               break;
 199
 200             case 'C':
 201               /* For c-100: print quotient of value by 96, if nonzero,
 202                  then do like %+.  */
 203               if (tem >= 96)
 204                 {
 205                   *op++ = tem / 96;
 206                   tem %= 96;
 207                 }
 208             case '+':           /* %+x means add character code of char x.  */
 209               tem += *p++;
 210             case '.':           /* %. means output as character.  */
 211               if (left)
 212                 {
 213                   /* If want to forbid output of 0 and \n and \t,
 214                      and this is one of them, increment it.  */
 215                   while (tem == 0 || tem == '\n' || tem == '\t')
 216                     {
 217                       tem++;
 218                       if (argp == old_argp)
 219                         doup++, outend -= strlen (up);
 220                       else
 221                         doleft++, outend -= strlen (left);
 222                     }
 223                 }
 224               *op++ = tem ? tem : 0200;
 225             case 'f':           /* %f means discard next arg.  */
 226               argp++;
 227               break;
 228
 229             case 'b':           /* %b means back up one arg (and re-use it).  */
 230               argp--;
 231               break;
 232
 233             case 'r':           /* %r means interchange following two args.  */
 234               argp[0] = argp[1];
 235               argp[1] = tem;
 236               old_argp++;
 237               break;
 238
 239             case '>':           /* %>xy means if arg is > char code of x, */
 240               if (argp[0] > *p++) /* then add char code of y to the arg, */
 241                 argp[0] += *p;  /* and in any case don't output.  */
 242               p++;              /* Leave the arg to be output later.  */
 243               break;
 244
 245             case 'a':           /* %a means arithmetic.  */
 246               /* Next character says what operation.
 247                  Add or subtract either a constant or some other arg.  */
 248               /* First following character is + to add or - to subtract
 249                  or = to assign.  */
 250               /* Next following char is 'p' and an arg spec
 251                  (0100 plus position of that arg relative to this one)
 252                  or 'c' and a constant stored in a character.  */
 253               tem = p[2] & 0177;
 254               if (p[1] == 'p')
 255                 tem = argp[tem - 0100];
 256               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 if (p[0] == '/')
 263                 argp[0] /= tem;
 264               else
 265                 argp[0] = tem;
 266
 267               p += 3;
 268               break;
 269
 270             case 'i':           /* %i means add one to arg, */
 271               argp[0] ++;       /* and leave it to be output later.  */
 272               argp[1] ++;       /* Increment the following arg, too!  */
 273               break;
 274
 275             case '%':           /* %% means output %; no arg.  */
 276               goto ordinary;
 277
 278             case 'n':           /* %n means xor each of next two args with 140.  */
 279               argp[0] ^= 0140;
 280               argp[1] ^= 0140;
 281               break;
 282
 283             case 'm':           /* %m means xor each of next two args with 177.  */
 284               argp[0] ^= 0177;
 285               argp[1] ^= 0177;
 286               break;
 287
 288             case 'B':           /* %B means express arg as BCD char code.  */
 289               argp[0] += 6 * (tem / 10);
 290               break;
 291
 292             case 'D':           /* %D means weird Delta Data transformation.  */
 293               argp[0] -= 2 * (tem % 16);
 294               break;
 295
 296             default:
 297               abort ();
 298             }
 299         }
 300       else
 301         /* Ordinary character in the argument string.  */
 302       ordinary:
 303         *op++ = c;
 304     }
 305   *op = 0;
 306   while (doup-- > 0)
 307     strcat (op, up);
 308   while (doleft-- > 0)
 309     strcat (op, left);
 310   return outstring;
 311 }
 312 \f
 313 #ifdef DEBUG
 314
 315 main (argc, argv)
 316      int argc;
 317      char **argv;
 318 {
 319   char buf[50];
 320   int args[3];
 321   args[0] = atoi (argv[2]);
 322   args[1] = atoi (argv[3]);
 323   args[2] = atoi (argv[4]);
 324   tparam1 (argv[1], buf, "LEFT", "UP", args);
 325   printf ("%s\n", buf);
 326   return 0;
 327 }
 328
 329 #endif /* DEBUG */