src/tparam.c

   1 /* Merge parameters into a termcap entry string.
   2    Copyright (C) 1985, 1987, 1993, 1995, 2000, 2002, 2003, 2004,
   3                  2005, 2006 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 "lisp.h"               /* for xmalloc */
  27 #else
  28
  29 #ifdef STDC_HEADERS
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #else
  33 char *malloc ();
  34 char *realloc ();
  35 #endif
  36
  37 /* Do this after the include, in case string.h prototypes bcopy.  */
  38 #if (defined(HAVE_STRING_H) || defined(STDC_HEADERS)) && !defined(bcopy)
  39 #define bcopy(s, d, n) memcpy ((d), (s), (n))
  40 #endif
  41
  42 #endif /* not emacs */
  43
  44 #ifndef NULL
  45 #define NULL (char *) 0
  46 #endif
  47 \f
  48 #ifndef emacs
  49 static void
  50 memory_out ()
  51 {
  52   write (2, "virtual memory exhausted\n", 25);
  53   exit (1);
  54 }
  55
  56 static char *
  57 xmalloc (size)
  58      unsigned size;
  59 {
  60   register char *tem = malloc (size);
  61
  62   if (!tem)
  63     memory_out ();
  64   return tem;
  65 }
  66
  67 static char *
  68 xrealloc (ptr, size)
  69      char *ptr;
  70      unsigned size;
  71 {
  72   register char *tem = realloc (ptr, size);
  73
  74   if (!tem)
  75     memory_out ();
  76   return tem;
  77 }
  78 #endif /* not emacs */
  79 \f
  80 /* Assuming STRING is the value of a termcap string entry
  81    containing `%' constructs to expand parameters,
  82    merge in parameter values and store result in block OUTSTRING points to.
  83    LEN is the length of OUTSTRING.  If more space is needed,
  84    a block is allocated with `malloc'.
  85
  86    The value returned is the address of the resulting string.
  87    This may be OUTSTRING or may be the address of a block got with `malloc'.
  88    In the latter case, the caller must free the block.
  89
  90    The fourth and following args to tparam serve as the parameter values.  */
  91
  92 static char *tparam1 ();
  93
  94 /* VARARGS 2 */
  95 char *
  96 tparam (string, outstring, len, arg0, arg1, arg2, arg3)
  97      char *string;
  98      char *outstring;
  99      int len;
 100      int arg0, arg1, arg2, arg3;
 101 {
 102   int arg[4];
 103
 104   arg[0] = arg0;
 105   arg[1] = arg1;
 106   arg[2] = arg2;
 107   arg[3] = arg3;
 108   return tparam1 (string, outstring, len, NULL, NULL, arg);
 109 }
 110
 111 /* These are already defined in the System framework in Mac OS X and
 112    cause prebinding to fail.  */
 113 #ifndef MAC_OSX
 114 char *BC;
 115 char *UP;
 116
 117 static char tgoto_buf[50];
 118
 119 char *
 120 tgoto (cm, hpos, vpos)
 121      char *cm;
 122      int hpos, vpos;
 123 {
 124   int args[2];
 125   if (!cm)
 126     return NULL;
 127   args[0] = vpos;
 128   args[1] = hpos;
 129   return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
 130 }
 131 #endif
 132
 133 static char *
 134 tparam1 (string, outstring, len, up, left, argp)
 135      char *string;
 136      char *outstring;
 137      int len;
 138      char *up, *left;
 139      register int *argp;
 140 {
 141   register int c;
 142   register char *p = string;
 143   register char *op = outstring;
 144   char *outend;
 145   int outlen = 0;
 146
 147   register int tem;
 148   int *old_argp = argp;                 /* can move */
 149   int *fixed_argp = argp;               /* never moves */
 150   int explicit_param_p = 0;             /* set by %p */
 151   int doleft = 0;
 152   int doup = 0;
 153
 154   outend = outstring + len;
 155
 156   while (1)
 157     {
 158       /* If the buffer might be too short, make it bigger.  */
 159       if (op + 5 >= outend)
 160         {
 161           register char *new;
 162           int offset = op - outstring;
 163
 164           if (outlen == 0)
 165             {
 166               outlen = len + 40;
 167               new = (char *) xmalloc (outlen);
 168               bcopy (outstring, new, offset);
 169             }
 170           else
 171             {
 172               outlen *= 2;
 173               new = (char *) xrealloc (outstring, outlen);
 174             }
 175
 176           op = new + offset;
 177           outend = new + outlen;
 178           outstring = new;
 179         }
 180       c = *p++;
 181       if (!c)
 182         break;
 183       if (c == '%')
 184         {
 185           c = *p++;
 186           if (explicit_param_p)
 187             explicit_param_p = 0;
 188           else
 189             tem = *argp;
 190           switch (c)
 191             {
 192             case 'd':           /* %d means output in decimal.  */
 193               if (tem < 10)
 194                 goto onedigit;
 195               if (tem < 100)
 196                 goto twodigit;
 197             case '3':           /* %3 means output in decimal, 3 digits.  */
 198               if (tem > 999)
 199                 {
 200                   *op++ = tem / 1000 + '0';
 201                   tem %= 1000;
 202                 }
 203               *op++ = tem / 100 + '0';
 204             case '2':           /* %2 means output in decimal, 2 digits.  */
 205             twodigit:
 206               tem %= 100;
 207               *op++ = tem / 10 + '0';
 208             onedigit:
 209               *op++ = tem % 10 + '0';
 210               argp++;
 211               break;
 212             case 'p':           /* %pN means use param N for next subst.  */
 213               tem = fixed_argp[(*p++) - '1'];
 214               explicit_param_p = 1;
 215               break;
 216             case 'C':
 217               /* For c-100: print quotient of value by 96, if nonzero,
 218                  then do like %+.  */
 219               if (tem >= 96)
 220                 {
 221                   *op++ = tem / 96;
 222                   tem %= 96;
 223                 }
 224             case '+':           /* %+x means add character code of char x.  */
 225               tem += *p++;
 226             case '.':           /* %. means output as character.  */
 227               if (left)
 228                 {
 229                   /* If want to forbid output of 0 and \n and \t,
 230                      and this is one of them, increment it.  */
 231                   while (tem == 0 || tem == '\n' || tem == '\t')
 232                     {
 233                       tem++;
 234                       if (argp == old_argp)
 235                         doup++, outend -= strlen (up);
 236                       else
 237                         doleft++, outend -= strlen (left);
 238                     }
 239                 }
 240               *op++ = tem ? tem : 0200;
 241             case 'f':           /* %f means discard next arg.  */
 242               argp++;
 243               break;
 244
 245             case 'b':           /* %b means back up one arg (and re-use it).  */
 246               argp--;
 247               break;
 248
 249             case 'r':           /* %r means interchange following two args.  */
 250               argp[0] = argp[1];
 251               argp[1] = tem;
 252               old_argp++;
 253               break;
 254
 255             case '>':           /* %>xy means if arg is > char code of x, */
 256               if (argp[0] > *p++) /* then add char code of y to the arg, */
 257                 argp[0] += *p;  /* and in any case don't output.  */
 258               p++;              /* Leave the arg to be output later.  */
 259               break;
 260
 261             case 'a':           /* %a means arithmetic.  */
 262               /* Next character says what operation.
 263                  Add or subtract either a constant or some other arg.  */
 264               /* First following character is + to add or - to subtract
 265                  or = to assign.  */
 266               /* Next following char is 'p' and an arg spec
 267                  (0100 plus position of that arg relative to this one)
 268                  or 'c' and a constant stored in a character.  */
 269               tem = p[2] & 0177;
 270               if (p[1] == 'p')
 271                 tem = argp[tem - 0100];
 272               if (p[0] == '-')
 273                 argp[0] -= tem;
 274               else if (p[0] == '+')
 275                 argp[0] += tem;
 276               else if (p[0] == '*')
 277                 argp[0] *= tem;
 278               else if (p[0] == '/')
 279                 argp[0] /= tem;
 280               else
 281                 argp[0] = tem;
 282
 283               p += 3;
 284               break;
 285
 286             case 'i':           /* %i means add one to arg, */
 287               argp[0] ++;       /* and leave it to be output later.  */
 288               argp[1] ++;       /* Increment the following arg, too!  */
 289               break;
 290
 291             case '%':           /* %% means output %; no arg.  */
 292               goto ordinary;
 293
 294             case 'n':           /* %n means xor each of next two args with 140.  */
 295               argp[0] ^= 0140;
 296               argp[1] ^= 0140;
 297               break;
 298
 299             case 'm':           /* %m means xor each of next two args with 177.  */
 300               argp[0] ^= 0177;
 301               argp[1] ^= 0177;
 302               break;
 303
 304             case 'B':           /* %B means express arg as BCD char code.  */
 305               argp[0] += 6 * (tem / 10);
 306               break;
 307
 308             case 'D':           /* %D means weird Delta Data transformation.  */
 309               argp[0] -= 2 * (tem % 16);
 310               break;
 311
 312             default:
 313               abort ();
 314             }
 315         }
 316       else
 317         /* Ordinary character in the argument string.  */
 318       ordinary:
 319         *op++ = c;
 320     }
 321   *op = 0;
 322   while (doup-- > 0)
 323     strcat (op, up);
 324   while (doleft-- > 0)
 325     strcat (op, left);
 326   return outstring;
 327 }
 328 \f
 329 #ifdef DEBUG
 330
 331 main (argc, argv)
 332      int argc;
 333      char **argv;
 334 {
 335   char buf[50];
 336   int args[3];
 337   args[0] = atoi (argv[2]);
 338   args[1] = atoi (argv[3]);
 339   args[2] = atoi (argv[4]);
 340   tparam1 (argv[1], buf, "LEFT", "UP", args);
 341   printf ("%s\n", buf);
 342   return 0;
 343 }
 344
 345 #endif /* DEBUG */
 346
 347 /* arch-tag: 83f7b5ac-a808-4f75-b87a-123de009b402
 348    (do not change this comment) */