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 (char *string, char *outstring, int len, char *up, char *left, register int *argp);
  94
  95 /* VARARGS 2 */
  96 char *
  97 tparam (char *string, char *outstring, int len, int arg0, int arg1, int arg2, int 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 (char *cm, int hpos, int vpos)
 115 {
 116   int args[2];
 117   if (!cm)
 118     return NULL;
 119   args[0] = vpos;
 120   args[1] = hpos;
 121   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 122 }
 123
 124 static char *
 125 tparam1 (char *string, char *outstring, int len, char *up, char *left, register int *argp)
 126 {
 127   register int c;
 128   register char *p = string;
 129   register char *op = outstring;
 130   char *outend;
 131   int outlen = 0;
 132
 133   register int tem;
 134   int *old_argp = argp;                 /* can move */
 135   int *fixed_argp = argp;               /* never moves */
 136   int explicit_param_p = 0;             /* set by %p */
 137   int doleft = 0;
 138   int doup = 0;
 139
 140   outend = outstring + len;
 141
 142   while (1)
 143     {
 144       /* If the buffer might be too short, make it bigger.  */
 145       if (op + 5 >= outend)
 146         {
 147           register char *new;
 148           int offset = op - outstring;
 149
 150           if (outlen == 0)
 151             {
 152               outlen = len + 40;
 153               new = (char *) xmalloc (outlen);
 154               bcopy (outstring, new, offset);
 155             }
 156           else
 157             {
 158               outlen *= 2;
 159               new = (char *) xrealloc (outstring, outlen);
 160             }
 161
 162           op = new + offset;
 163           outend = new + outlen;
 164           outstring = new;
 165         }
 166       c = *p++;
 167       if (!c)
 168         break;
 169       if (c == '%')
 170         {
 171           c = *p++;
 172           if (explicit_param_p)
 173             explicit_param_p = 0;
 174           else
 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             case 'p':           /* %pN means use param N for next subst.  */
 199               tem = fixed_argp[(*p++) - '1'];
 200               explicit_param_p = 1;
 201               break;
 202             case 'C':
 203               /* For c-100: print quotient of value by 96, if nonzero,
 204                  then do like %+.  */
 205               if (tem >= 96)
 206                 {
 207                   *op++ = tem / 96;
 208                   tem %= 96;
 209                 }
 210             case '+':           /* %+x means add character code of char x.  */
 211               tem += *p++;
 212             case '.':           /* %. means output as character.  */
 213               if (left)
 214                 {
 215                   /* If want to forbid output of 0 and \n and \t,
 216                      and this is one of them, increment it.  */
 217                   while (tem == 0 || tem == '\n' || tem == '\t')
 218                     {
 219                       tem++;
 220                       if (argp == old_argp)
 221                         doup++, outend -= strlen (up);
 222                       else
 223                         doleft++, outend -= strlen (left);
 224                     }
 225                 }
 226               *op++ = tem ? tem : 0200;
 227             case 'f':           /* %f means discard next arg.  */
 228               argp++;
 229               break;
 230
 231             case 'b':           /* %b means back up one arg (and re-use it).  */
 232               argp--;
 233               break;
 234
 235             case 'r':           /* %r means interchange following two args.  */
 236               argp[0] = argp[1];
 237               argp[1] = tem;
 238               old_argp++;
 239               break;
 240
 241             case '>':           /* %>xy means if arg is > char code of x, */
 242               if (argp[0] > *p++) /* then add char code of y to the arg, */
 243                 argp[0] += *p;  /* and in any case don't output.  */
 244               p++;              /* Leave the arg to be output later.  */
 245               break;
 246
 247             case 'a':           /* %a means arithmetic.  */
 248               /* Next character says what operation.
 249                  Add or subtract either a constant or some other arg.  */
 250               /* First following character is + to add or - to subtract
 251                  or = to assign.  */
 252               /* Next following char is 'p' and an arg spec
 253                  (0100 plus position of that arg relative to this one)
 254                  or 'c' and a constant stored in a character.  */
 255               tem = p[2] & 0177;
 256               if (p[1] == 'p')
 257                 tem = argp[tem - 0100];
 258               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 if (p[0] == '/')
 265                 argp[0] /= tem;
 266               else
 267                 argp[0] = tem;
 268
 269               p += 3;
 270               break;
 271
 272             case 'i':           /* %i means add one to arg, */
 273               argp[0] ++;       /* and leave it to be output later.  */
 274               argp[1] ++;       /* Increment the following arg, too!  */
 275               break;
 276
 277             case '%':           /* %% means output %; no arg.  */
 278               goto ordinary;
 279
 280             case 'n':           /* %n means xor each of next two args with 140.  */
 281               argp[0] ^= 0140;
 282               argp[1] ^= 0140;
 283               break;
 284
 285             case 'm':           /* %m means xor each of next two args with 177.  */
 286               argp[0] ^= 0177;
 287               argp[1] ^= 0177;
 288               break;
 289
 290             case 'B':           /* %B means express arg as BCD char code.  */
 291               argp[0] += 6 * (tem / 10);
 292               break;
 293
 294             case 'D':           /* %D means weird Delta Data transformation.  */
 295               argp[0] -= 2 * (tem % 16);
 296               break;
 297
 298             default:
 299               abort ();
 300             }
 301         }
 302       else
 303         /* Ordinary character in the argument string.  */
 304       ordinary:
 305         *op++ = c;
 306     }
 307   *op = 0;
 308   while (doup-- > 0)
 309     strcat (op, up);
 310   while (doleft-- > 0)
 311     strcat (op, left);
 312   return outstring;
 313 }
 314 \f
 315 #ifdef DEBUG
 316
 317 main (argc, argv)
 318      int argc;
 319      char **argv;
 320 {
 321   char buf[50];
 322   int args[3];
 323   args[0] = atoi (argv[2]);
 324   args[1] = atoi (argv[3]);
 325   args[2] = atoi (argv[4]);
 326   tparam1 (argv[1], buf, "LEFT", "UP", args);
 327   printf ("%s\n", buf);
 328   return 0;
 329 }
 330
 331 #endif /* DEBUG */
 332
 333 /* arch-tag: 83f7b5ac-a808-4f75-b87a-123de009b402
 334    (do not change this comment) */