tparam.c

   1 /* Merge parameters into a termcap entry string.
   2    Copyright (C) 1985, 1987, 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Emacs config.h may rename various library functions such as malloc.  */
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #else /* not HAVE_CONFIG_H */
  22
  23 #if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
  24 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  25 #endif
  26
  27 #ifdef STDC_HEADERS
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #else
  31 char *malloc ();
  32 char *realloc ();
  33 #endif
  34
  35 #endif /* not HAVE_CONFIG_H */
  36
  37 #ifndef NULL
  38 #define NULL (char *) 0
  39 #endif
  40 \f
  41 #ifndef emacs
  42 static void
  43 memory_out ()
  44 {
  45   write (2, "virtual memory exhausted\n", 25);
  46   exit (1);
  47 }
  48
  49 static char *
  50 xmalloc (size)
  51      unsigned size;
  52 {
  53   register char *tem = malloc (size);
  54
  55   if (!tem)
  56     memory_out ();
  57   return tem;
  58 }
  59
  60 static char *
  61 xrealloc (ptr, size)
  62      char *ptr;
  63      unsigned size;
  64 {
  65   register char *tem = realloc (ptr, size);
  66
  67   if (!tem)
  68     memory_out ();
  69   return tem;
  70 }
  71 #endif /* not emacs */
  72 \f
  73 /* Assuming STRING is the value of a termcap string entry
  74    containing `%' constructs to expand parameters,
  75    merge in parameter values and store result in block OUTSTRING points to.
  76    LEN is the length of OUTSTRING.  If more space is needed,
  77    a block is allocated with `malloc'.
  78
  79    The value returned is the address of the resulting string.
  80    This may be OUTSTRING or may be the address of a block got with `malloc'.
  81    In the latter case, the caller must free the block.
  82
  83    The fourth and following args to tparam serve as the parameter values.  */
  84
  85 static char *tparam1 ();
  86
  87 /* VARARGS 2 */
  88 char *
  89 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  90      char *string;
  91      char *outstring;
  92      int len;
  93      int arg0, arg1, arg2, arg3;
  94 {
  95 #ifdef NO_ARG_ARRAY
  96   int arg[4];
  97   arg[0] = arg0;
  98   arg[1] = arg1;
  99   arg[2] = arg2;
 100   arg[3] = arg3;
 101   return tparam1 (string, outstring, len, NULL, NULL, arg);
 102 #else
 103   return tparam1 (string, outstring, len, NULL, NULL, &arg0);
 104 #endif
 105 }
 106
 107 char *BC;
 108 char *UP;
 109
 110 static char tgoto_buf[50];
 111
 112 char *
 113 tgoto (cm, hpos, vpos)
 114      char *cm;
 115      int hpos, vpos;
 116 {
 117   int args[2];
 118   if (!cm)
 119     return NULL;
 120   args[0] = vpos;
 121   args[1] = hpos;
 122   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 123 }
 124
 125 static char *
 126 tparam1 (string, outstring, len, up, left, argp)
 127      char *string;
 128      char *outstring;
 129      int len;
 130      char *up, *left;
 131      register int *argp;
 132 {
 133   register int c;
 134   register char *p = string;
 135   register char *op = outstring;
 136   char *outend;
 137   int outlen = 0;
 138
 139   register int tem;
 140   int *old_argp = argp;
 141   int doleft = 0;
 142   int doup = 0;
 143
 144   outend = outstring + len;
 145
 146   while (1)
 147     {
 148       /* If the buffer might be too short, make it bigger.  */
 149       if (op + 5 >= outend)
 150         {
 151           register char *new;
 152           if (outlen == 0)
 153             {
 154               outlen = len + 40;
 155               new = (char *) xmalloc (outlen);
 156               outend += 40;
 157               bcopy (outstring, new, op - outstring);
 158             }
 159           else
 160             {
 161               outend += outlen;
 162               outlen *= 2;
 163               new = (char *) xrealloc (outstring, outlen);
 164             }
 165           op += new - outstring;
 166           outend += new - outstring;
 167           outstring = new;
 168         }
 169       c = *p++;
 170       if (!c)
 171         break;
 172       if (c == '%')
 173         {
 174           c = *p++;
 175           tem = *argp;
 176           switch (c)
 177             {
 178             case 'd':           /* %d means output in decimal.  */
 179               if (tem < 10)
 180                 goto onedigit;
 181               if (tem < 100)
 182                 goto twodigit;
 183             case '3':           /* %3 means output in decimal, 3 digits.  */
 184               if (tem > 999)
 185                 {
 186                   *op++ = tem / 1000 + '0';
 187                   tem %= 1000;
 188                 }
 189               *op++ = tem / 100 + '0';
 190             case '2':           /* %2 means output in decimal, 2 digits.  */
 191             twodigit:
 192               tem %= 100;
 193               *op++ = tem / 10 + '0';
 194             onedigit:
 195               *op++ = tem % 10 + '0';
 196               argp++;
 197               break;
 198
 199             case 'C':
 200               /* For c-100: print quotient of value by 96, if nonzero,
 201                  then do like %+.  */
 202               if (tem >= 96)
 203                 {
 204                   *op++ = tem / 96;
 205                   tem %= 96;
 206                 }
 207             case '+':           /* %+x means add character code of char x.  */
 208               tem += *p++;
 209             case '.':           /* %. means output as character.  */
 210               if (left)
 211                 {
 212                   /* If want to forbid output of 0 and \n and \t,
 213                      and this is one of them, increment it.  */
 214                   while (tem == 0 || tem == '\n' || tem == '\t')
 215                     {
 216                       tem++;
 217                       if (argp == old_argp)
 218                         doup++, outend -= strlen (up);
 219                       else
 220                         doleft++, outend -= strlen (left);
 221                     }
 222                 }
 223               *op++ = tem ? tem : 0200;
 224             case 'f':           /* %f means discard next arg.  */
 225               argp++;
 226               break;
 227
 228             case 'b':           /* %b means back up one arg (and re-use it).  */
 229               argp--;
 230               break;
 231
 232             case 'r':           /* %r means interchange following two args.  */
 233               argp[0] = argp[1];
 234               argp[1] = tem;
 235               old_argp++;
 236               break;
 237
 238             case '>':           /* %>xy means if arg is > char code of x, */
 239               if (argp[0] > *p++) /* then add char code of y to the arg, */
 240                 argp[0] += *p;  /* and in any case don't output.  */
 241               p++;              /* Leave the arg to be output later.  */
 242               break;
 243
 244             case 'a':           /* %a means arithmetic.  */
 245               /* Next character says what operation.
 246                  Add or subtract either a constant or some other arg.  */
 247               /* First following character is + to add or - to subtract
 248                  or = to assign.  */
 249               /* Next following char is 'p' and an arg spec
 250                  (0100 plus position of that arg relative to this one)
 251                  or 'c' and a constant stored in a character.  */
 252               tem = p[2] & 0177;
 253               if (p[1] == 'p')
 254                 tem = argp[tem - 0100];
 255               if (p[0] == '-')
 256                 argp[0] -= tem;
 257               else 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
 264                 argp[0] = tem;
 265
 266               p += 3;
 267               break;
 268
 269             case 'i':           /* %i means add one to arg, */
 270               argp[0] ++;       /* and leave it to be output later.  */
 271               argp[1] ++;       /* Increment the following arg, too!  */
 272               break;
 273
 274             case '%':           /* %% means output %; no arg.  */
 275               goto ordinary;
 276
 277             case 'n':           /* %n means xor each of next two args with 140.  */
 278               argp[0] ^= 0140;
 279               argp[1] ^= 0140;
 280               break;
 281
 282             case 'm':           /* %m means xor each of next two args with 177.  */
 283               argp[0] ^= 0177;
 284               argp[1] ^= 0177;
 285               break;
 286
 287             case 'B':           /* %B means express arg as BCD char code.  */
 288               argp[0] += 6 * (tem / 10);
 289               break;
 290
 291             case 'D':           /* %D means weird Delta Data transformation.  */
 292               argp[0] -= 2 * (tem % 16);
 293               break;
 294             }
 295         }
 296       else
 297         /* Ordinary character in the argument string.  */
 298       ordinary:
 299         *op++ = c;
 300     }
 301   *op = 0;
 302   while (doup-- > 0)
 303     strcat (op, up);
 304   while (doleft-- > 0)
 305     strcat (op, left);
 306   return outstring;
 307 }
 308 \f
 309 #ifdef DEBUG
 310
 311 main (argc, argv)
 312      int argc;
 313      char **argv;
 314 {
 315   char buf[50];
 316   int args[3];
 317   args[0] = atoi (argv[2]);
 318   args[1] = atoi (argv[3]);
 319   args[2] = atoi (argv[4]);
 320   tparam1 (argv[1], buf, "LEFT", "UP", args);
 321   printf ("%s\n", buf);
 322   return 0;
 323 }
 324
 325 #endif /* DEBUG */