[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"
\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)
	    {
	      outlen = len + 40;
	      new = xmalloc (outlen);
	      memcpy (new, outstring, offset);
	    }
	  else
	    {
	      new = xpalloc (outstring, &outlen, 1, -1, 1);
	    }

	  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 (INT_ADD_OVERFLOW (append_len, append_len_incr))
			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, 50, "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	25	\f
e0dd62f6 RM	26	/* Assuming STRING is the value of a termcap string entry
	27	containing `%' constructs to expand parameters,
	28	merge in parameter values and store result in block OUTSTRING points to.
	29	LEN is the length of OUTSTRING. If more space is needed,
	30	a block is allocated with `malloc'.
	31
	32	The value returned is the address of the resulting string.
	33	This may be OUTSTRING or may be the address of a block got with `malloc'.
	34	In the latter case, the caller must free the block.
	35
	36	The fourth and following args to tparam serve as the parameter values. */
	37
50938595 PE	38	static char tparam1 (char const string, char *outstring, int len,
50938595 PE	39	char up, char left, int *argp);
e0dd62f6	40
e0dd62f6	41	char *
50938595 PE	42	tparam (const char string, char outstring, int len,
50938595 PE	43	int arg0, int arg1, int arg2, int arg3)
e0dd62f6	44	{
e0dd62f6	45	int arg[4];
9e3295f9	46
e0dd62f6 RM	47	arg[0] = arg0;
	48	arg[1] = arg1;
	49	arg[2] = arg2;
	50	arg[3] = arg3;
	51	return tparam1 (string, outstring, len, NULL, NULL, arg);
e0dd62f6 RM	52	}
	53
	54	char *BC;
	55	char *UP;
	56
	57	static char tgoto_buf[50];
	58
	59	char *
50938595	60	tgoto (const char *cm, int hpos, int vpos)
e0dd62f6 RM	61	{
	62	int args[2];
	63	if (!cm)
	64	return NULL;
	65	args[0] = vpos;
	66	args[1] = hpos;
	67	return tparam1 (cm, tgoto_buf, 50, UP, BC, args);
	68	}
	69
	70	static char *
50938595 PE	71	tparam1 (const char string, char outstring, int len,
50938595 PE	72	char up, char left, register int *argp)
e0dd62f6 RM	73	{
e0dd62f6 RM	74	register int c;
50938595	75	register const char *p = string;
e0dd62f6 RM	76	register char *op = outstring;
e0dd62f6 RM	77	char *outend;
8fbadbe3 PE	78	char *new = 0;
8fbadbe3 PE	79	ptrdiff_t outlen = 0;
e0dd62f6 RM	80
e0dd62f6 RM	81	register int tem;
9ad4bf7a TTN	82	int old_argp = argp; / can move */
	83	int fixed_argp = argp; / never moves */
	84	int explicit_param_p = 0; /* set by %p */
8fbadbe3 PE	85	ptrdiff_t doleft = 0;
	86	ptrdiff_t doup = 0;
	87	ptrdiff_t append_len = 0;
e0dd62f6 RM	88
	89	outend = outstring + len;
	90
	91	while (1)
	92	{
	93	/* If the buffer might be too short, make it bigger. */
8fbadbe3	94	while (outend - op - append_len <= 5)
e0dd62f6	95	{
8fbadbe3	96	ptrdiff_t offset = op - outstring;
b5e55477	97
e0dd62f6 RM	98	if (outlen == 0)
	99	{
	100	outlen = len + 40;
23f86fce	101	new = xmalloc (outlen);
72af86bd	102	memcpy (new, outstring, offset);
e0dd62f6 RM	103	}
	104	else
	105	{
0065d054	106	new = xpalloc (outstring, &outlen, 1, -1, 1);
e0dd62f6	107	}
177c0ea7	108
b5e55477 GM	109	op = new + offset;
b5e55477 GM	110	outend = new + outlen;
e0dd62f6 RM	111	outstring = new;
	112	}
	113	c = *p++;
	114	if (!c)
	115	break;
	116	if (c == '%')
	117	{
	118	c = *p++;
9ad4bf7a TTN	119	if (explicit_param_p)
	120	explicit_param_p = 0;
	121	else
	122	tem = *argp;
e0dd62f6 RM	123	switch (c)
	124	{
	125	case 'd': /* %d means output in decimal. */
	126	if (tem < 10)
	127	goto onedigit;
	128	if (tem < 100)
	129	goto twodigit;
	130	case '3': /* %3 means output in decimal, 3 digits. */
	131	if (tem > 999)
	132	{
	133	*op++ = tem / 1000 + '0';
	134	tem %= 1000;
	135	}
	136	*op++ = tem / 100 + '0';
	137	case '2': /* %2 means output in decimal, 2 digits. */
	138	twodigit:
	139	tem %= 100;
	140	*op++ = tem / 10 + '0';
	141	onedigit:
	142	*op++ = tem % 10 + '0';
	143	argp++;
	144	break;
9ad4bf7a TTN	145	case 'p': /* %pN means use param N for next subst. */
	146	tem = fixed_argp[(*p++) - '1'];
	147	explicit_param_p = 1;
	148	break;
e0dd62f6 RM	149	case 'C':
	150	/* For c-100: print quotient of value by 96, if nonzero,
	151	then do like %+. */
	152	if (tem >= 96)
	153	{
	154	*op++ = tem / 96;
	155	tem %= 96;
	156	}
	157	case '+': /* %+x means add character code of char x. */
	158	tem += *p++;
	159	case '.': /* %. means output as character. */
	160	if (left)
	161	{
	162	/* If want to forbid output of 0 and \n and \t,
	163	and this is one of them, increment it. */
	164	while (tem == 0 \|\| tem == '\n' \|\| tem == '\t')
	165	{
8fbadbe3	166	ptrdiff_t append_len_incr;
e0dd62f6 RM	167	tem++;
e0dd62f6 RM	168	if (argp == old_argp)
8fbadbe3	169	doup++, append_len_incr = strlen (up);
e0dd62f6	170	else
8fbadbe3	171	doleft++, append_len_incr = strlen (left);
0065d054 PE	172	if (INT_ADD_OVERFLOW (append_len, append_len_incr))
0065d054 PE	173	memory_full (SIZE_MAX);
8fbadbe3	174	append_len += append_len_incr;
e0dd62f6 RM	175	}
	176	}
	177	*op++ = tem ? tem : 0200;
	178	case 'f': /* %f means discard next arg. */
	179	argp++;
	180	break;
	181
	182	case 'b': /* %b means back up one arg (and re-use it). */
	183	argp--;
	184	break;
	185
	186	case 'r': /* %r means interchange following two args. */
	187	argp[0] = argp[1];
	188	argp[1] = tem;
	189	old_argp++;
	190	break;
	191
	192	case '>': /* %>xy means if arg is > char code of x, */
	193	if (argp[0] > p++) / then add char code of y to the arg, */
	194	argp[0] += p; / and in any case don't output. */
	195	p++; /* Leave the arg to be output later. */
	196	break;
	197
	198	case 'a': /* %a means arithmetic. */
	199	/* Next character says what operation.
	200	Add or subtract either a constant or some other arg. */
	201	/* First following character is + to add or - to subtract
	202	or = to assign. */
	203	/* Next following char is 'p' and an arg spec
	204	(0100 plus position of that arg relative to this one)
	205	or 'c' and a constant stored in a character. */
	206	tem = p[2] & 0177;
	207	if (p[1] == 'p')
	208	tem = argp[tem - 0100];
	209	if (p[0] == '-')
	210	argp[0] -= tem;
	211	else if (p[0] == '+')
	212	argp[0] += tem;
	213	else if (p[0] == '*')
	214	argp[0] *= tem;
	215	else if (p[0] == '/')
	216	argp[0] /= tem;
	217	else
	218	argp[0] = tem;
	219
	220	p += 3;
	221	break;
	222
	223	case 'i': /* %i means add one to arg, */
	224	argp[0] ++; /* and leave it to be output later. */
	225	argp[1] ++; /* Increment the following arg, too! */
	226	break;
	227
	228	case '%': /* %% means output %; no arg. */
	229	goto ordinary;
	230
	231	case 'n': /* %n means xor each of next two args with 140. */
	232	argp[0] ^= 0140;
	233	argp[1] ^= 0140;
	234	break;
	235
	236	case 'm': /* %m means xor each of next two args with 177. */
	237	argp[0] ^= 0177;
	238	argp[1] ^= 0177;
239	break;
240
241	case 'B': /* %B means express arg as BCD char code. */
242	argp[0] += 6 * (tem / 10);
243	break;
244
245	case 'D': /* %D means weird Delta Data transformation. */
246	argp[0] -= 2 * (tem % 16);
247	break;
45e0dd95 GM	248
	249	default:
	250	abort ();
e0dd62f6 RM	251	}
	252	}
	253	else
	254	/* Ordinary character in the argument string. */
	255	ordinary:
	256	*op++ = c;
	257	}
	258	*op = 0;
	259	while (doup-- > 0)
	260	strcat (op, up);
	261	while (doleft-- > 0)
	262	strcat (op, left);
	263	return outstring;
	264	}
	265	\f
	266	#ifdef DEBUG
	267
1dae0f0a AS	268	int
1dae0f0a AS	269	main (int argc, char **argv)
e0dd62f6 RM	270	{
	271	char buf[50];
	272	int args[3];
	273	args[0] = atoi (argv[2]);
	274	args[1] = atoi (argv[3]);
	275	args[2] = atoi (argv[4]);
0065d054	276	tparam1 (argv[1], buf, 50, "LEFT", "UP", args);
e0dd62f6 RM	277	printf ("%s\n", buf);
	278	return 0;
	279	}
	280
	281	#endif /* DEBUG */