[bpt/emacs.git] / src / tparam.c

/* Merge parameters into a termcap entry string.
   Copyright (C) 1985, 1987, 1993, 1995, 2000, 2001, 2002, 2003, 2004,
                 2005, 2006, 2007, 2008  Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

/* Emacs config.h may rename various library functions such as malloc.  */
#include <config.h>
#include <setjmp.h>
#include "lisp.h"		/* for xmalloc */
#include "tparam.h"

#ifndef NULL
#define NULL (char *) 0
#endif
\f
/* Assuming STRING is the value of a termcap string entry
   containing `%' constructs to expand parameters,
   merge in parameter values and store result in block OUTSTRING points to.
   LEN is the length of OUTSTRING.  If more space is needed,
   a block is allocated with `malloc'.

   The value returned is the address of the resulting string.
   This may be OUTSTRING or may be the address of a block got with `malloc'.
   In the latter case, the caller must free the block.

   The fourth and following args to tparam serve as the parameter values.  */

static char *tparam1 (char const *string, char *outstring, int len,
		      char *up, char *left, int *argp);

char *
tparam (const char *string, char *outstring, int len,
	int arg0, int arg1, int arg2, int arg3)
{
  int arg[4];

  arg[0] = arg0;
  arg[1] = arg1;
  arg[2] = arg2;
  arg[3] = arg3;
  return tparam1 (string, outstring, len, NULL, NULL, arg);
}

char *BC;
char *UP;

static char tgoto_buf[50];

char *
tgoto (const char *cm, int hpos, int vpos)
{
  int args[2];
  if (!cm)
    return NULL;
  args[0] = vpos;
  args[1] = hpos;
  return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
}

static char *
tparam1 (const char *string, char *outstring, int len,
	 char *up, char *left, register int *argp)
{
  register int c;
  register const char *p = string;
  register char *op = outstring;
  char *outend;
  char *new = 0;
  ptrdiff_t outlen = 0;

  register int tem;
  int *old_argp = argp;                 /* can move */
  int *fixed_argp = argp;               /* never moves */
  int explicit_param_p = 0;             /* set by %p */
  ptrdiff_t doleft = 0;
  ptrdiff_t doup = 0;
  ptrdiff_t append_len = 0;

  outend = outstring + len;

  while (1)
    {
      /* If the buffer might be too short, make it bigger.  */
      while (outend - op - append_len <= 5)
	{
	  ptrdiff_t offset = op - outstring;

	  if (outlen == 0)
	    {
	      if (min (PTRDIFF_MAX, SIZE_MAX) - 40 < len)
		goto out_of_memory;
	      outlen = len + 40;
	      new = (char *) xmalloc (outlen);
	      memcpy (new, outstring, offset);
	    }
	  else
	    {
	      if (min (PTRDIFF_MAX, SIZE_MAX) / 2 < outlen)
		goto out_of_memory;
	      outlen *= 2;
	      new = (char *) xrealloc (outstring, outlen);
	    }

	  op = new + offset;
	  outend = new + outlen;
	  outstring = new;
	}
      c = *p++;
      if (!c)
	break;
      if (c == '%')
	{
	  c = *p++;
	  if (explicit_param_p)
	    explicit_param_p = 0;
	  else
	    tem = *argp;
	  switch (c)
	    {
	    case 'd':		/* %d means output in decimal.  */
	      if (tem < 10)
		goto onedigit;
	      if (tem < 100)
		goto twodigit;
	    case '3':		/* %3 means output in decimal, 3 digits.  */
	      if (tem > 999)
		{
		  *op++ = tem / 1000 + '0';
		  tem %= 1000;
		}
	      *op++ = tem / 100 + '0';
	    case '2':		/* %2 means output in decimal, 2 digits.  */
	    twodigit:
	      tem %= 100;
	      *op++ = tem / 10 + '0';
	    onedigit:
	      *op++ = tem % 10 + '0';
	      argp++;
	      break;
            case 'p':           /* %pN means use param N for next subst.  */
	      tem = fixed_argp[(*p++) - '1'];
	      explicit_param_p = 1;
	      break;
	    case 'C':
	      /* For c-100: print quotient of value by 96, if nonzero,
		 then do like %+.  */
	      if (tem >= 96)
		{
		  *op++ = tem / 96;
		  tem %= 96;
		}
	    case '+':		/* %+x means add character code of char x.  */
	      tem += *p++;
	    case '.':		/* %. means output as character.  */
	      if (left)
		{
		  /* If want to forbid output of 0 and \n and \t,
		     and this is one of them, increment it.  */
		  while (tem == 0 || tem == '\n' || tem == '\t')
		    {
		      ptrdiff_t append_len_incr;
		      tem++;
		      if (argp == old_argp)
			doup++, append_len_incr = strlen (up);
		      else
			doleft++, append_len_incr = strlen (left);
		      if (PTRDIFF_MAX - append_len < append_len_incr)
			{
			out_of_memory:
			  xfree (new);
			  memory_full (SIZE_MAX);
			}
		      append_len += append_len_incr;
		    }
		}
	      *op++ = tem ? tem : 0200;
	    case 'f':		/* %f means discard next arg.  */
	      argp++;
	      break;

	    case 'b':		/* %b means back up one arg (and re-use it).  */
	      argp--;
	      break;

	    case 'r':		/* %r means interchange following two args.  */
	      argp[0] = argp[1];
	      argp[1] = tem;
	      old_argp++;
	      break;

	    case '>':		/* %>xy means if arg is > char code of x, */
	      if (argp[0] > *p++) /* then add char code of y to the arg, */
		argp[0] += *p;	/* and in any case don't output.  */
	      p++;		/* Leave the arg to be output later.  */
	      break;

	    case 'a':		/* %a means arithmetic.  */
	      /* Next character says what operation.
		 Add or subtract either a constant or some other arg.  */
	      /* First following character is + to add or - to subtract
		 or = to assign.  */
	      /* Next following char is 'p' and an arg spec
		 (0100 plus position of that arg relative to this one)
		 or 'c' and a constant stored in a character.  */
	      tem = p[2] & 0177;
	      if (p[1] == 'p')
		tem = argp[tem - 0100];
	      if (p[0] == '-')
		argp[0] -= tem;
	      else if (p[0] == '+')
		argp[0] += tem;
	      else if (p[0] == '*')
		argp[0] *= tem;
	      else if (p[0] == '/')
		argp[0] /= tem;
	      else
		argp[0] = tem;

	      p += 3;
	      break;

	    case 'i':		/* %i means add one to arg, */
	      argp[0] ++;	/* and leave it to be output later.  */
	      argp[1] ++;	/* Increment the following arg, too!  */
	      break;

	    case '%':		/* %% means output %; no arg.  */
	      goto ordinary;

	    case 'n':		/* %n means xor each of next two args with 140.  */
	      argp[0] ^= 0140;
	      argp[1] ^= 0140;
	      break;

	    case 'm':		/* %m means xor each of next two args with 177.  */
	      argp[0] ^= 0177;
	      argp[1] ^= 0177;
	      break;

	    case 'B':		/* %B means express arg as BCD char code.  */
	      argp[0] += 6 * (tem / 10);
	      break;

	    case 'D':		/* %D means weird Delta Data transformation.  */
	      argp[0] -= 2 * (tem % 16);
	      break;

	    default:
	      abort ();
	    }
	}
      else
	/* Ordinary character in the argument string.  */
      ordinary:
	*op++ = c;
    }
  *op = 0;
  while (doup-- > 0)
    strcat (op, up);
  while (doleft-- > 0)
    strcat (op, left);
  return outstring;
}
\f
#ifdef DEBUG

int
main (int argc, char **argv)
{
  char buf[50];
  int args[3];
  args[0] = atoi (argv[2]);
  args[1] = atoi (argv[3]);
  args[2] = atoi (argv[4]);
  tparam1 (argv[1], buf, "LEFT", "UP", args);
  printf ("%s\n", buf);
  return 0;
}

#endif /* DEBUG */
Commit	Line	Data
e0dd62f6	1	/* Merge parameters into a termcap entry string.
429ab54e	2	Copyright (C) 1985, 1987, 1993, 1995, 2000, 2001, 2002, 2003, 2004,
0a64641e	3	2005, 2006, 2007, 2008 Free Software Foundation, Inc.
e0dd62f6 RM	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
4fc5845f LK	17	the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
4fc5845f LK	18	Boston, MA 02110-1301, USA. */
e0dd62f6 RM	19
e0dd62f6 RM	20	/* Emacs config.h may rename various library functions such as malloc. */
e0dd62f6	21	#include <config.h>
d7306fe6	22	#include <setjmp.h>
83c2ece5	23	#include "lisp.h" /* for xmalloc */
50938595	24	#include "tparam.h"
e0dd62f6 RM	25
	26	#ifndef NULL
	27	#define NULL (char *) 0
	28	#endif
	29	\f
e0dd62f6 RM	30	/* Assuming STRING is the value of a termcap string entry
	31	containing `%' constructs to expand parameters,
	32	merge in parameter values and store result in block OUTSTRING points to.
	33	LEN is the length of OUTSTRING. If more space is needed,
	34	a block is allocated with `malloc'.
	35
	36	The value returned is the address of the resulting string.
	37	This may be OUTSTRING or may be the address of a block got with `malloc'.
	38	In the latter case, the caller must free the block.
	39
	40	The fourth and following args to tparam serve as the parameter values. */
	41
50938595 PE	42	static char tparam1 (char const string, char *outstring, int len,
50938595 PE	43	char up, char left, int *argp);
e0dd62f6	44
e0dd62f6	45	char *
50938595 PE	46	tparam (const char string, char outstring, int len,
50938595 PE	47	int arg0, int arg1, int arg2, int arg3)
e0dd62f6	48	{
e0dd62f6	49	int arg[4];
9e3295f9	50
e0dd62f6 RM	51	arg[0] = arg0;
	52	arg[1] = arg1;
	53	arg[2] = arg2;
	54	arg[3] = arg3;
	55	return tparam1 (string, outstring, len, NULL, NULL, arg);
e0dd62f6 RM	56	}
	57
	58	char *BC;
	59	char *UP;
	60
	61	static char tgoto_buf[50];
	62
	63	char *
50938595	64	tgoto (const char *cm, int hpos, int vpos)
e0dd62f6 RM	65	{
	66	int args[2];
	67	if (!cm)
	68	return NULL;
	69	args[0] = vpos;
	70	args[1] = hpos;
	71	return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
	72	}
	73
	74	static char *
50938595 PE	75	tparam1 (const char string, char outstring, int len,
50938595 PE	76	char up, char left, register int *argp)
e0dd62f6 RM	77	{
e0dd62f6 RM	78	register int c;
50938595	79	register const char *p = string;
e0dd62f6 RM	80	register char *op = outstring;
e0dd62f6 RM	81	char *outend;
8fbadbe3 PE	82	char *new = 0;
8fbadbe3 PE	83	ptrdiff_t outlen = 0;
e0dd62f6 RM	84
e0dd62f6 RM	85	register int tem;
9ad4bf7a TTN	86	int old_argp = argp; / can move */
	87	int fixed_argp = argp; / never moves */
	88	int explicit_param_p = 0; /* set by %p */
8fbadbe3 PE	89	ptrdiff_t doleft = 0;
	90	ptrdiff_t doup = 0;
	91	ptrdiff_t append_len = 0;
e0dd62f6 RM	92
	93	outend = outstring + len;
	94
	95	while (1)
	96	{
	97	/* If the buffer might be too short, make it bigger. */
8fbadbe3	98	while (outend - op - append_len <= 5)
e0dd62f6	99	{
8fbadbe3	100	ptrdiff_t offset = op - outstring;
b5e55477	101
e0dd62f6 RM	102	if (outlen == 0)
e0dd62f6 RM	103	{
8fbadbe3 PE	104	if (min (PTRDIFF_MAX, SIZE_MAX) - 40 < len)
8fbadbe3 PE	105	goto out_of_memory;
e0dd62f6 RM	106	outlen = len + 40;
e0dd62f6 RM	107	new = (char *) xmalloc (outlen);
72af86bd	108	memcpy (new, outstring, offset);
e0dd62f6 RM	109	}
	110	else
	111	{
8fbadbe3 PE	112	if (min (PTRDIFF_MAX, SIZE_MAX) / 2 < outlen)
8fbadbe3 PE	113	goto out_of_memory;
e0dd62f6 RM	114	outlen *= 2;
	115	new = (char *) xrealloc (outstring, outlen);
	116	}
177c0ea7	117
b5e55477 GM	118	op = new + offset;
b5e55477 GM	119	outend = new + outlen;
e0dd62f6 RM	120	outstring = new;
	121	}
	122	c = *p++;
	123	if (!c)
	124	break;
	125	if (c == '%')
	126	{
	127	c = *p++;
9ad4bf7a TTN	128	if (explicit_param_p)
	129	explicit_param_p = 0;
	130	else
	131	tem = *argp;
e0dd62f6 RM	132	switch (c)
	133	{
	134	case 'd': /* %d means output in decimal. */
	135	if (tem < 10)
	136	goto onedigit;
	137	if (tem < 100)
	138	goto twodigit;
	139	case '3': /* %3 means output in decimal, 3 digits. */
	140	if (tem > 999)
	141	{
	142	*op++ = tem / 1000 + '0';
	143	tem %= 1000;
	144	}
	145	*op++ = tem / 100 + '0';
	146	case '2': /* %2 means output in decimal, 2 digits. */
	147	twodigit:
	148	tem %= 100;
	149	*op++ = tem / 10 + '0';
	150	onedigit:
	151	*op++ = tem % 10 + '0';
	152	argp++;
	153	break;
9ad4bf7a TTN	154	case 'p': /* %pN means use param N for next subst. */
	155	tem = fixed_argp[(*p++) - '1'];
	156	explicit_param_p = 1;
	157	break;
e0dd62f6 RM	158	case 'C':
	159	/* For c-100: print quotient of value by 96, if nonzero,
	160	then do like %+. */
	161	if (tem >= 96)
	162	{
	163	*op++ = tem / 96;
	164	tem %= 96;
	165	}
	166	case '+': /* %+x means add character code of char x. */
	167	tem += *p++;
	168	case '.': /* %. means output as character. */
	169	if (left)
	170	{
	171	/* If want to forbid output of 0 and \n and \t,
	172	and this is one of them, increment it. */
	173	while (tem == 0 \|\| tem == '\n' \|\| tem == '\t')
	174	{
8fbadbe3	175	ptrdiff_t append_len_incr;
e0dd62f6 RM	176	tem++;
e0dd62f6 RM	177	if (argp == old_argp)
8fbadbe3	178	doup++, append_len_incr = strlen (up);
e0dd62f6	179	else
8fbadbe3 PE	180	doleft++, append_len_incr = strlen (left);
	181	if (PTRDIFF_MAX - append_len < append_len_incr)
	182	{
	183	out_of_memory:
	184	xfree (new);
	185	memory_full (SIZE_MAX);
	186	}
	187	append_len += append_len_incr;
e0dd62f6 RM	188	}
	189	}
	190	*op++ = tem ? tem : 0200;
	191	case 'f': /* %f means discard next arg. */
	192	argp++;
	193	break;
	194
	195	case 'b': /* %b means back up one arg (and re-use it). */
	196	argp--;
	197	break;
	198
	199	case 'r': /* %r means interchange following two args. */
	200	argp[0] = argp[1];
	201	argp[1] = tem;
	202	old_argp++;
	203	break;
	204
	205	case '>': /* %>xy means if arg is > char code of x, */
	206	if (argp[0] > p++) / then add char code of y to the arg, */
	207	argp[0] += p; / and in any case don't output. */
	208	p++; /* Leave the arg to be output later. */
	209	break;
	210
	211	case 'a': /* %a means arithmetic. */
	212	/* Next character says what operation.
	213	Add or subtract either a constant or some other arg. */
	214	/* First following character is + to add or - to subtract
	215	or = to assign. */
	216	/* Next following char is 'p' and an arg spec
	217	(0100 plus position of that arg relative to this one)
	218	or 'c' and a constant stored in a character. */
	219	tem = p[2] & 0177;
	220	if (p[1] == 'p')
	221	tem = argp[tem - 0100];
	222	if (p[0] == '-')
	223	argp[0] -= tem;
	224	else if (p[0] == '+')
	225	argp[0] += tem;
	226	else if (p[0] == '*')
	227	argp[0] *= tem;
	228	else if (p[0] == '/')
	229	argp[0] /= tem;
	230	else
	231	argp[0] = tem;
	232
	233	p += 3;
	234	break;
	235
	236	case 'i': /* %i means add one to arg, */
	237	argp[0] ++; /* and leave it to be output later. */
	238	argp[1] ++; /* Increment the following arg, too! */
	239	break;
	240
	241	case '%': /* %% means output %; no arg. */
	242	goto ordinary;
	243
	244	case 'n': /* %n means xor each of next two args with 140. */
	245	argp[0] ^= 0140;
	246	argp[1] ^= 0140;
	247	break;
	248
	249	case 'm': /* %m means xor each of next two args with 177. */
	250	argp[0] ^= 0177;
	251	argp[1] ^= 0177;
252	break;
253
254	case 'B': /* %B means express arg as BCD char code. */
255	argp[0] += 6 * (tem / 10);
256	break;
257
258	case 'D': /* %D means weird Delta Data transformation. */
259	argp[0] -= 2 * (tem % 16);
260	break;
45e0dd95 GM	261
	262	default:
	263	abort ();
e0dd62f6 RM	264	}
	265	}
	266	else
	267	/* Ordinary character in the argument string. */
	268	ordinary:
	269	*op++ = c;
	270	}
	271	*op = 0;
	272	while (doup-- > 0)
	273	strcat (op, up);
	274	while (doleft-- > 0)
	275	strcat (op, left);
	276	return outstring;
	277	}
	278	\f
	279	#ifdef DEBUG
	280
1dae0f0a AS	281	int
1dae0f0a AS	282	main (int argc, char **argv)
e0dd62f6 RM	283	{
	284	char buf[50];
	285	int args[3];
	286	args[0] = atoi (argv[2]);
	287	args[1] = atoi (argv[3]);
	288	args[2] = atoi (argv[4]);
	289	tparam1 (argv[1], buf, "LEFT", "UP", args);
	290	printf ("%s\n", buf);
	291	return 0;
	292	}
	293
	294	#endif /* DEBUG */