1/* Merge parameters into a termcap entry string.
2   Copyright (C) 1985, 1987, 1993, 1995, 2000, 2001, 2002, 2003, 2004,
3                 2005, 2006, 2007  Free Software Foundation, Inc.
4
5This program is free software; you can redistribute it and/or modify
6it under the terms of the GNU General Public License as published by
7the Free Software Foundation; either version 2, or (at your option)
8any later version.
9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; see the file COPYING.  If not, write to
17the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18Boston, 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
33char *malloc ();
34char *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
48#ifndef emacs
49static void
50memory_out ()
51{
52  write (2, "virtual memory exhausted\n", 25);
53  exit (1);
54}
55
56static char *
57xmalloc (size)
58     unsigned size;
59{
60  register char *tem = malloc (size);
61
62  if (!tem)
63    memory_out ();
64  return tem;
65}
66
67static char *
68xrealloc (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
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
92static char *tparam1 ();
93
94/* VARARGS 2 */
95char *
96tparam (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
114char *BC;
115char *UP;
116
117static char tgoto_buf[50];
118
119char *
120tgoto (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
133static char *
134tparam1 (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
329#ifdef DEBUG
330
331main (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) */
349