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., 51 Franklin Street, Fifth Floor,
  17 Boston, MA 02110-1301, 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 /* These are already defined in the System framework in Mac OS X and
 111    cause prebinding to fail.  */
 112 #ifndef MAC_OSX
 113 char *BC;
 114 char *UP;
 115
 116 static char tgoto_buf[50];
 117
 118 char *
 119 tgoto (cm, hpos, vpos)
 120      char *cm;
 121      int hpos, vpos;
 122 {
 123   int args[2];
 124   if (!cm)
 125     return NULL;
 126   args[0] = vpos;
 127   args[1] = hpos;
 128   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 129 }
 130 #endif
 131
 132 static char *
 133 tparam1 (string, outstring, len, up, left, argp)
 134      char *string;
 135      char *outstring;
 136      int len;
 137      char *up, *left;
 138      register int *argp;
 139 {
 140   register int c;
 141   register char *p = string;
 142   register char *op = outstring;
 143   char *outend;
 144   int outlen = 0;
 145
 146   register int tem;
 147   int *old_argp = argp;                 /* can move */
 148   int *fixed_argp = argp;               /* never moves */
 149   int explicit_param_p = 0;             /* set by %p */
 150   int doleft = 0;
 151   int doup = 0;
 152
 153   outend = outstring + len;
 154
 155   while (1)
 156     {
 157       /* If the buffer might be too short, make it bigger.  */
 158       if (op + 5 >= outend)
 159         {
 160           register char *new;
 161           int offset = op - outstring;
 162
 163           if (outlen == 0)
 164             {
 165               outlen = len + 40;
 166               new = (char *) xmalloc (outlen);
 167               bcopy (outstring, new, offset);
 168             }
 169           else
 170             {
 171               outlen *= 2;
 172               new = (char *) xrealloc (outstring, outlen);
 173             }
 174
 175           op = new + offset;
 176           outend = new + outlen;
 177           outstring = new;
 178         }
 179       c = *p++;
 180       if (!c)
 181         break;
 182       if (c == '%')
 183         {
 184           c = *p++;
 185           if (explicit_param_p)
 186             explicit_param_p = 0;
 187           else
 188             tem = *argp;
 189           switch (c)
 190             {
 191             case 'd':           /* %d means output in decimal.  */
 192               if (tem < 10)
 193                 goto onedigit;
 194               if (tem < 100)
 195                 goto twodigit;
 196             case '3':           /* %3 means output in decimal, 3 digits.  */
 197               if (tem > 999)
 198                 {
 199                   *op++ = tem / 1000 + '0';
 200                   tem %= 1000;
 201                 }
 202               *op++ = tem / 100 + '0';
 203             case '2':           /* %2 means output in decimal, 2 digits.  */
 204             twodigit:
 205               tem %= 100;
 206               *op++ = tem / 10 + '0';
 207             onedigit:
 208               *op++ = tem % 10 + '0';
 209               argp++;
 210               break;
 211             case 'p':           /* %pN means use param N for next subst.  */
 212               tem = fixed_argp[(*p++) - '1'];
 213               explicit_param_p = 1;
 214               break;
 215             case 'C':
 216               /* For c-100: print quotient of value by 96, if nonzero,
 217                  then do like %+.  */
 218               if (tem >= 96)
 219                 {
 220                   *op++ = tem / 96;
 221                   tem %= 96;
 222                 }
 223             case '+':           /* %+x means add character code of char x.  */
 224               tem += *p++;
 225             case '.':           /* %. means output as character.  */
 226               if (left)
 227                 {
 228                   /* If want to forbid output of 0 and \n and \t,
 229                      and this is one of them, increment it.  */
 230                   while (tem == 0 || tem == '\n' || tem == '\t')
 231                     {
 232                       tem++;
 233                       if (argp == old_argp)
 234                         doup++, outend -= strlen (up);
 235                       else
 236                         doleft++, outend -= strlen (left);
 237                     }
 238                 }
 239               *op++ = tem ? tem : 0200;
 240             case 'f':           /* %f means discard next arg.  */
 241               argp++;
 242               break;
 243
 244             case 'b':           /* %b means back up one arg (and re-use it).  */
 245               argp--;
 246               break;
 247
 248             case 'r':           /* %r means interchange following two args.  */
 249               argp[0] = argp[1];
 250               argp[1] = tem;
 251               old_argp++;
 252               break;
 253
 254             case '>':           /* %>xy means if arg is > char code of x, */
 255               if (argp[0] > *p++) /* then add char code of y to the arg, */
 256                 argp[0] += *p;  /* and in any case don't output.  */
 257               p++;              /* Leave the arg to be output later.  */
 258               break;
 259
 260             case 'a':           /* %a means arithmetic.  */
 261               /* Next character says what operation.
 262                  Add or subtract either a constant or some other arg.  */
 263               /* First following character is + to add or - to subtract
 264                  or = to assign.  */
 265               /* Next following char is 'p' and an arg spec
 266                  (0100 plus position of that arg relative to this one)
 267                  or 'c' and a constant stored in a character.  */
 268               tem = p[2] & 0177;
 269               if (p[1] == 'p')
 270                 tem = argp[tem - 0100];
 271               if (p[0] == '-')
 272                 argp[0] -= tem;
 273               else if (p[0] == '+')
 274                 argp[0] += tem;
 275               else if (p[0] == '*')
 276                 argp[0] *= tem;
 277               else if (p[0] == '/')
 278                 argp[0] /= tem;
 279               else
 280                 argp[0] = tem;
 281
 282               p += 3;
 283               break;
 284
 285             case 'i':           /* %i means add one to arg, */
 286               argp[0] ++;       /* and leave it to be output later.  */
 287               argp[1] ++;       /* Increment the following arg, too!  */
 288               break;
 289
 290             case '%':           /* %% means output %; no arg.  */
 291               goto ordinary;
 292
 293             case 'n':           /* %n means xor each of next two args with 140.  */
 294               argp[0] ^= 0140;
 295               argp[1] ^= 0140;
 296               break;
 297
 298             case 'm':           /* %m means xor each of next two args with 177.  */
 299               argp[0] ^= 0177;
 300               argp[1] ^= 0177;
 301               break;
 302
 303             case 'B':           /* %B means express arg as BCD char code.  */
 304               argp[0] += 6 * (tem / 10);
 305               break;
 306
 307             case 'D':           /* %D means weird Delta Data transformation.  */
 308               argp[0] -= 2 * (tem % 16);
 309               break;
 310
 311             default:
 312               abort ();
 313             }
 314         }
 315       else
 316         /* Ordinary character in the argument string.  */
 317       ordinary:
 318         *op++ = c;
 319     }
 320   *op = 0;
 321   while (doup-- > 0)
 322     strcat (op, up);
 323   while (doleft-- > 0)
 324     strcat (op, left);
 325   return outstring;
 326 }
 327 \f
 328 #ifdef DEBUG
 329
 330 main (argc, argv)
 331      int argc;
 332      char **argv;
 333 {
 334   char buf[50];
 335   int args[3];
 336   args[0] = atoi (argv[2]);
 337   args[1] = atoi (argv[3]);
 338   args[2] = atoi (argv[4]);
 339   tparam1 (argv[1], buf, "LEFT", "UP", args);
 340   printf ("%s\n", buf);
 341   return 0;
 342 }
 343
 344 #endif /* DEBUG */
 345
 346 /* arch-tag: 83f7b5ac-a808-4f75-b87a-123de009b402
 347    (do not change this comment) */