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 /* 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;
 148   int doleft = 0;
 149   int doup = 0;
 150
 151   outend = outstring + len;
 152
 153   while (1)
 154     {
 155       /* If the buffer might be too short, make it bigger.  */
 156       if (op + 5 >= outend)
 157         {
 158           register char *new;
 159           int offset = op - outstring;
 160
 161           if (outlen == 0)
 162             {
 163               outlen = len + 40;
 164               new = (char *) xmalloc (outlen);
 165               bcopy (outstring, new, offset);
 166             }
 167           else
 168             {
 169               outlen *= 2;
 170               new = (char *) xrealloc (outstring, outlen);
 171             }
 172
 173           op = new + offset;
 174           outend = new + outlen;
 175           outstring = new;
 176         }
 177       c = *p++;
 178       if (!c)
 179         break;
 180       if (c == '%')
 181         {
 182           c = *p++;
 183           tem = *argp;
 184           switch (c)
 185             {
 186             case 'd':           /* %d means output in decimal.  */
 187               if (tem < 10)
 188                 goto onedigit;
 189               if (tem < 100)
 190                 goto twodigit;
 191             case '3':           /* %3 means output in decimal, 3 digits.  */
 192               if (tem > 999)
 193                 {
 194                   *op++ = tem / 1000 + '0';
 195                   tem %= 1000;
 196                 }
 197               *op++ = tem / 100 + '0';
 198             case '2':           /* %2 means output in decimal, 2 digits.  */
 199             twodigit:
 200               tem %= 100;
 201               *op++ = tem / 10 + '0';
 202             onedigit:
 203               *op++ = tem % 10 + '0';
 204               argp++;
 205               break;
 206
 207             case 'C':
 208               /* For c-100: print quotient of value by 96, if nonzero,
 209                  then do like %+.  */
 210               if (tem >= 96)
 211                 {
 212                   *op++ = tem / 96;
 213                   tem %= 96;
 214                 }
 215             case '+':           /* %+x means add character code of char x.  */
 216               tem += *p++;
 217             case '.':           /* %. means output as character.  */
 218               if (left)
 219                 {
 220                   /* If want to forbid output of 0 and \n and \t,
 221                      and this is one of them, increment it.  */
 222                   while (tem == 0 || tem == '\n' || tem == '\t')
 223                     {
 224                       tem++;
 225                       if (argp == old_argp)
 226                         doup++, outend -= strlen (up);
 227                       else
 228                         doleft++, outend -= strlen (left);
 229                     }
 230                 }
 231               *op++ = tem ? tem : 0200;
 232             case 'f':           /* %f means discard next arg.  */
 233               argp++;
 234               break;
 235
 236             case 'b':           /* %b means back up one arg (and re-use it).  */
 237               argp--;
 238               break;
 239
 240             case 'r':           /* %r means interchange following two args.  */
 241               argp[0] = argp[1];
 242               argp[1] = tem;
 243               old_argp++;
 244               break;
 245
 246             case '>':           /* %>xy means if arg is > char code of x, */
 247               if (argp[0] > *p++) /* then add char code of y to the arg, */
 248                 argp[0] += *p;  /* and in any case don't output.  */
 249               p++;              /* Leave the arg to be output later.  */
 250               break;
 251
 252             case 'a':           /* %a means arithmetic.  */
 253               /* Next character says what operation.
 254                  Add or subtract either a constant or some other arg.  */
 255               /* First following character is + to add or - to subtract
 256                  or = to assign.  */
 257               /* Next following char is 'p' and an arg spec
 258                  (0100 plus position of that arg relative to this one)
 259                  or 'c' and a constant stored in a character.  */
 260               tem = p[2] & 0177;
 261               if (p[1] == 'p')
 262                 tem = argp[tem - 0100];
 263               if (p[0] == '-')
 264                 argp[0] -= tem;
 265               else if (p[0] == '+')
 266                 argp[0] += tem;
 267               else if (p[0] == '*')
 268                 argp[0] *= tem;
 269               else if (p[0] == '/')
 270                 argp[0] /= tem;
 271               else
 272                 argp[0] = tem;
 273
 274               p += 3;
 275               break;
 276
 277             case 'i':           /* %i means add one to arg, */
 278               argp[0] ++;       /* and leave it to be output later.  */
 279               argp[1] ++;       /* Increment the following arg, too!  */
 280               break;
 281
 282             case '%':           /* %% means output %; no arg.  */
 283               goto ordinary;
 284
 285             case 'n':           /* %n means xor each of next two args with 140.  */
 286               argp[0] ^= 0140;
 287               argp[1] ^= 0140;
 288               break;
 289
 290             case 'm':           /* %m means xor each of next two args with 177.  */
 291               argp[0] ^= 0177;
 292               argp[1] ^= 0177;
 293               break;
 294
 295             case 'B':           /* %B means express arg as BCD char code.  */
 296               argp[0] += 6 * (tem / 10);
 297               break;
 298
 299             case 'D':           /* %D means weird Delta Data transformation.  */
 300               argp[0] -= 2 * (tem % 16);
 301               break;
 302
 303             default:
 304               abort ();
 305             }
 306         }
 307       else
 308         /* Ordinary character in the argument string.  */
 309       ordinary:
 310         *op++ = c;
 311     }
 312   *op = 0;
 313   while (doup-- > 0)
 314     strcat (op, up);
 315   while (doleft-- > 0)
 316     strcat (op, left);
 317   return outstring;
 318 }
 319 \f
 320 #ifdef DEBUG
 321
 322 main (argc, argv)
 323      int argc;
 324      char **argv;
 325 {
 326   char buf[50];
 327   int args[3];
 328   args[0] = atoi (argv[2]);
 329   args[1] = atoi (argv[3]);
 330   args[2] = atoi (argv[4]);
 331   tparam1 (argv[1], buf, "LEFT", "UP", args);
 332   printf ("%s\n", buf);
 333   return 0;
 334 }
 335
 336 #endif /* DEBUG */