src/tparam.c

   1 /* Merge parameters into a termcap entry string.
   2    Copyright (C) 1985, 1987, 1993, 1995, 2000, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008  Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18 Boston, MA 02110-1301, USA.  */
  19
  20 /* Emacs config.h may rename various library functions such as malloc.  */
  21 #ifdef HAVE_CONFIG_H
  22 #include <config.h>
  23 #endif
  24
  25 #ifdef emacs
  26 #include <setjmp.h>
  27 #include "lisp.h"               /* for xmalloc */
  28 #else
  29
  30 #ifdef STDC_HEADERS
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #else
  34 char *malloc ();
  35 char *realloc ();
  36 #endif
  37
  38 /* Do this after the include, in case string.h prototypes bcopy.  */
  39 #if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
  40 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  41 #endif
  42
  43 #endif /* not emacs */
  44
  45 #ifndef NULL
  46 #define NULL (char *) 0
  47 #endif
  48 \f
  49 #ifndef emacs
  50 static void
  51 memory_out ()
  52 {
  53   write (2, "virtual memory exhausted\n", 25);
  54   exit (1);
  55 }
  56
  57 static char *
  58 xmalloc (size)
  59      unsigned size;
  60 {
  61   register char *tem = malloc (size);
  62
  63   if (!tem)
  64     memory_out ();
  65   return tem;
  66 }
  67
  68 static char *
  69 xrealloc (ptr, size)
  70      char *ptr;
  71      unsigned size;
  72 {
  73   register char *tem = realloc (ptr, size);
  74
  75   if (!tem)
  76     memory_out ();
  77   return tem;
  78 }
  79 #endif /* not emacs */
  80 \f
  81 /* Assuming STRING is the value of a termcap string entry
  82    containing `%' constructs to expand parameters,
  83    merge in parameter values and store result in block OUTSTRING points to.
  84    LEN is the length of OUTSTRING.  If more space is needed,
  85    a block is allocated with `malloc'.
  86
  87    The value returned is the address of the resulting string.
  88    This may be OUTSTRING or may be the address of a block got with `malloc'.
  89    In the latter case, the caller must free the block.
  90
  91    The fourth and following args to tparam serve as the parameter values.  */
  92
  93 static char *tparam1 ();
  94
  95 /* VARARGS 2 */
  96 char *
  97 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  98      char *string;
  99      char *outstring;
 100      int len;
 101      int arg0, arg1, arg2, arg3;
 102 {
 103   int arg[4];
 104
 105   arg[0] = arg0;
 106   arg[1] = arg1;
 107   arg[2] = arg2;
 108   arg[3] = arg3;
 109   return tparam1 (string, outstring, len, NULL, NULL, arg);
 110 }
 111
 112 char *BC;
 113 char *UP;
 114
 115 static char tgoto_buf[50];
 116
 117 char *
 118 tgoto (cm, hpos, vpos)
 119      char *cm;
 120      int hpos, vpos;
 121 {
 122   int args[2];
 123   if (!cm)
 124     return NULL;
 125   args[0] = vpos;
 126   args[1] = hpos;
 127   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 128 }
 129
 130 static char *
 131 tparam1 (string, outstring, len, up, left, argp)
 132      char *string;
 133      char *outstring;
 134      int len;
 135      char *up, *left;
 136      register int *argp;
 137 {
 138   register int c;
 139   register char *p = string;
 140   register char *op = outstring;
 141   char *outend;
 142   int outlen = 0;
 143
 144   register int tem;
 145   int *old_argp = argp;                 /* can move */
 146   int *fixed_argp = argp;               /* never moves */
 147   int explicit_param_p = 0;             /* set by %p */
 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           if (explicit_param_p)
 184             explicit_param_p = 0;
 185           else
 186             tem = *argp;
 187           switch (c)
 188             {
 189             case 'd':           /* %d means output in decimal.  */
 190               if (tem < 10)
 191                 goto onedigit;
 192               if (tem < 100)
 193                 goto twodigit;
 194             case '3':           /* %3 means output in decimal, 3 digits.  */
 195               if (tem > 999)
 196                 {
 197                   *op++ = tem / 1000 + '0';
 198                   tem %= 1000;
 199                 }
 200               *op++ = tem / 100 + '0';
 201             case '2':           /* %2 means output in decimal, 2 digits.  */
 202             twodigit:
 203               tem %= 100;
 204               *op++ = tem / 10 + '0';
 205             onedigit:
 206               *op++ = tem % 10 + '0';
 207               argp++;
 208               break;
 209             case 'p':           /* %pN means use param N for next subst.  */
 210               tem = fixed_argp[(*p++) - '1'];
 211               explicit_param_p = 1;
 212               break;
 213             case 'C':
 214               /* For c-100: print quotient of value by 96, if nonzero,
 215                  then do like %+.  */
 216               if (tem >= 96)
 217                 {
 218                   *op++ = tem / 96;
 219                   tem %= 96;
 220                 }
 221             case '+':           /* %+x means add character code of char x.  */
 222               tem += *p++;
 223             case '.':           /* %. means output as character.  */
 224               if (left)
 225                 {
 226                   /* If want to forbid output of 0 and \n and \t,
 227                      and this is one of them, increment it.  */
 228                   while (tem == 0 || tem == '\n' || tem == '\t')
 229                     {
 230                       tem++;
 231                       if (argp == old_argp)
 232                         doup++, outend -= strlen (up);
 233                       else
 234                         doleft++, outend -= strlen (left);
 235                     }
 236                 }
 237               *op++ = tem ? tem : 0200;
 238             case 'f':           /* %f means discard next arg.  */
 239               argp++;
 240               break;
 241
 242             case 'b':           /* %b means back up one arg (and re-use it).  */
 243               argp--;
 244               break;
 245
 246             case 'r':           /* %r means interchange following two args.  */
 247               argp[0] = argp[1];
 248               argp[1] = tem;
 249               old_argp++;
 250               break;
 251
 252             case '>':           /* %>xy means if arg is > char code of x, */
 253               if (argp[0] > *p++) /* then add char code of y to the arg, */
 254                 argp[0] += *p;  /* and in any case don't output.  */
 255               p++;              /* Leave the arg to be output later.  */
 256               break;
 257
 258             case 'a':           /* %a means arithmetic.  */
 259               /* Next character says what operation.
 260                  Add or subtract either a constant or some other arg.  */
 261               /* First following character is + to add or - to subtract
 262                  or = to assign.  */
 263               /* Next following char is 'p' and an arg spec
 264                  (0100 plus position of that arg relative to this one)
 265                  or 'c' and a constant stored in a character.  */
 266               tem = p[2] & 0177;
 267               if (p[1] == 'p')
 268                 tem = argp[tem - 0100];
 269               if (p[0] == '-')
 270                 argp[0] -= tem;
 271               else 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
 278                 argp[0] = tem;
 279
 280               p += 3;
 281               break;
 282
 283             case 'i':           /* %i means add one to arg, */
 284               argp[0] ++;       /* and leave it to be output later.  */
 285               argp[1] ++;       /* Increment the following arg, too!  */
 286               break;
 287
 288             case '%':           /* %% means output %; no arg.  */
 289               goto ordinary;
 290
 291             case 'n':           /* %n means xor each of next two args with 140.  */
 292               argp[0] ^= 0140;
 293               argp[1] ^= 0140;
 294               break;
 295
 296             case 'm':           /* %m means xor each of next two args with 177.  */
 297               argp[0] ^= 0177;
 298               argp[1] ^= 0177;
 299               break;
 300
 301             case 'B':           /* %B means express arg as BCD char code.  */
 302               argp[0] += 6 * (tem / 10);
 303               break;
 304
 305             case 'D':           /* %D means weird Delta Data transformation.  */
 306               argp[0] -= 2 * (tem % 16);
 307               break;
 308
 309             default:
 310               abort ();
 311             }
 312         }
 313       else
 314         /* Ordinary character in the argument string.  */
 315       ordinary:
 316         *op++ = c;
 317     }
 318   *op = 0;
 319   while (doup-- > 0)
 320     strcat (op, up);
 321   while (doleft-- > 0)
 322     strcat (op, left);
 323   return outstring;
 324 }
 325 \f
 326 #ifdef DEBUG
 327
 328 main (argc, argv)
 329      int argc;
 330      char **argv;
 331 {
 332   char buf[50];
 333   int args[3];
 334   args[0] = atoi (argv[2]);
 335   args[1] = atoi (argv[3]);
 336   args[2] = atoi (argv[4]);
 337   tparam1 (argv[1], buf, "LEFT", "UP", args);
 338   printf ("%s\n", buf);
 339   return 0;
 340 }
 341
 342 #endif /* DEBUG */
 343
 344 /* arch-tag: 83f7b5ac-a808-4f75-b87a-123de009b402
 345    (do not change this comment) */