[mLib] / dputf.c

/* -*-c-*-
 *
 * $Id: dputf.c,v 1.6 2004/04/08 01:36:11 mdw Exp $
 *
 * `printf'-style formatting for dynamic strings
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the mLib utilities library.
 *
 * mLib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * mLib 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 Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with mLib; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include <ctype.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_FLOAT_H
#  include <float.h>
#endif

#include "dstr.h"

/*----- Tunable constants -------------------------------------------------*/

/*
 * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured
 * before writing the formatted result.
 */

#define DSTR_PUTFSTEP 64		/* Buffer size for @putf@ */

/*----- Main code ---------------------------------------------------------*/

/* --- @dstr_vputf@ --- *
 *
 * Arguments:	@dstr *d@ = pointer to a dynamic string block
 *		@const char *p@ = pointer to @printf@-style format string
 *		@va_list *ap@ = argument handle
 *
 * Returns:	The number of characters written to the string.
 *
 * Use:		As for @dstr_putf@, but may be used as a back-end to user-
 *		supplied functions with @printf@-style interfaces.
 */

int dstr_vputf(dstr *d, const char *p, va_list *ap)
{
  const char *q = p;
  size_t n = d->len;
  size_t sz;
  dstr dd = DSTR_INIT;

  while (*p) {
    unsigned f;
    int wd, prec;

#define f_short 1u
#define f_long 2u
#define f_Long 4u
#define f_wd 8u
#define f_prec 16u

    /* --- Most stuff gets passed on through --- */

    if (*p != '%') {
      p++;
      continue;
    }

    /* --- Dump out what's between @q@ and @p@ --- */

    DPUTM(d, q, p - q);
    p++;

    /* --- Sort out the various silly flags and things --- */

    DPUTC(&dd, '%');
    f = 0;
    sz = DSTR_PUTFSTEP;

    for (;;) {
      switch (*p) {

	/* --- Various simple flags --- */

	case '+':
	case '-':
	case '#':
	case '0':
	  goto putch;
	case 'h':
	  f |= f_short;
	  goto putch;
	case 'l':
	  f |= f_long;
	  goto putch;
	case 'L':
	  f |= f_Long;
	  goto putch;
	case 0:
	  goto finished;

	/* --- Field widths and precision specifiers --- */

	{
	  int *ip;

	case '.':
	  DPUTC(&dd, '.');
	  ip = &prec;
	  f |= f_prec;
	  goto getnum;
	case '*':
	  ip = &wd;
	  f |= f_wd;
	  goto getnum;
	default:
	  if (isdigit((unsigned char)*p)) {
	    f |= f_wd;
	    ip = &wd;
	    goto getnum;
	  }
	  DPUTC(d, *p);
	  goto formatted;
        getnum:
	  *ip = 0;
	  if (*p == '*') {
	    *ip = va_arg(*ap, int);
	    DENSURE(&dd, DSTR_PUTFSTEP);
	    dd.len += sprintf(dd.buf + dd.len, "%i", *ip);
	  } else {
	    *ip = *p - '0';
	    DPUTC(&dd, *p);
	    p++;
	    while (isdigit((unsigned char)*p)) {
	      DPUTC(&dd, *p);
	      *ip = 10 * *ip + *p++ - '0';
	    }
	  }
	  break;
	}

	/* --- Output formatting --- */

	case 'd': case 'i': case 'x': case 'X': case 'o': case 'u':
	  DPUTC(&dd, *p);
	  DPUTZ(&dd);
	  if ((f & f_prec) && prec + 16 > sz)
	    sz = prec + 16;
	  if ((f & f_wd) && wd + 1> sz)
	    sz = wd + 1;
	  DENSURE(d, sz);
	  if (f & f_long)
	    d->len += sprintf(d->buf + d->len, dd.buf,
			      va_arg(*ap, unsigned long));
	  else
	    d->len += sprintf(d->buf + d->len, dd.buf,
			      va_arg(*ap, unsigned int));
	  goto formatted;

	case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
#ifdef HAVE_FLOAT_H
	  DPUTC(&dd, *p);
	  DPUTZ(&dd);
	  if (*p == 'f') {
	    size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16;
	    if (mx > sz)
	      sz = mx;
	  }
	  if (!(f & f_prec))
	    prec = 6;
	  else
	    sz += prec + 16;	    
	  if ((f & f_wd) && wd + 1 > sz)
	    sz = wd + 1;
	  DENSURE(d, sz);
	  if (f & f_Long)
	    d->len += sprintf(d->buf + d->len, dd.buf,
			      va_arg(*ap, long double));
	  else
	    d->len += sprintf(d->buf + d->len, dd.buf,
			      va_arg(*ap, double));
	  goto formatted;
#else
	  DPUTS(d, "<no float support>");
#endif

	case 'c':
	  DPUTC(&dd, *p);
	  DPUTZ(&dd);
	  if ((f & f_wd) && wd + 1> sz)
	    sz = wd + 1;
	  DENSURE(d, sz);
	  d->len += sprintf(d->buf + d->len, dd.buf,
			    va_arg(*ap, unsigned));
	  goto formatted;

	case 's': {
	  const char *s = va_arg(*ap, const char *);
	  sz = strlen(s);
	  DPUTC(&dd, *p);
	  DPUTZ(&dd);
	  if (f & f_prec)
	    sz = prec;
	  if ((f & f_wd) && wd > sz)
	    sz = wd;
	  DENSURE(d, sz + 1);
	  d->len += sprintf(d->buf + d->len, dd.buf, s);
	  goto formatted;
	}

	case 'p':
	  DPUTC(&dd, *p);
	  DPUTZ(&dd);
	  if ((f & f_prec) && prec + 16 > sz)
	    sz = prec + 16;
	  if ((f & f_wd) && wd + 1> sz)
	    sz = wd + 1;
	  DENSURE(d, sz);
	  d->len += sprintf(d->buf + d->len, dd.buf,
			    va_arg(*ap, const void *));
	  goto formatted;

	case 'n':
	  if (f & f_long)
	    *va_arg(*ap, long *) = (long)(d->len - n);
	  else if (f & f_short)
	    *va_arg(*ap, short *) = (short)(d->len - n);
	  else
	    *va_arg(*ap, int *) = (int)(d->len - n);
	  goto formatted;

	/* --- Other random stuff --- */

	putch:
	  DPUTC(&dd, *p);
	  p++;
	  break;
      }
    }

  formatted:
    DRESET(&dd);
    q = ++p;

#undef f_short
#undef f_long
#undef f_Long
#undef f_wd
#undef f_prec
  }

  DPUTM(d, q, p - q);
finished:
  DPUTZ(d);
  DDESTROY(&dd);
  return (d->len - n);
}

/* --- @dstr_putf@ --- *
 *
 * Arguments:	@dstr *d@ = pointer to a dynamic string block
 *		@const char *p@ = pointer to @printf@-style format string
 *		@...@ = argument handle
 *
 * Returns:	The number of characters written to the string.
 *
 * Use:		Writes a piece of text to a dynamic string, doing @printf@-
 *		style substitutions as it goes.  Intended to be robust if
 *		faced with malicious arguments, but not if the format string
 *		itself is malicious.
 */

int dstr_putf(dstr *d, const char *p, ...)
{
  int n;
  va_list ap;
  va_start(ap, p);
  n = dstr_vputf(d, p, &ap);
  va_end(ap);
  return (n);
}

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
002eaee3	1	/* --c--
002eaee3	2	*
8656dc50	3	* $Id: dputf.c,v 1.6 2004/04/08 01:36:11 mdw Exp $
002eaee3	4	*
	5	* `printf'-style formatting for dynamic strings
	6	*
	7	* (c) 1999 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of the mLib utilities library.
	13	*
	14	* mLib is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU Library General Public License as
	16	* published by the Free Software Foundation; either version 2 of the
	17	* License, or (at your option) any later version.
	18	*
	19	* mLib is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU Library General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU Library General Public
	25	* License along with mLib; if not, write to the Free
	26	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	27	* MA 02111-1307, USA.
	28	*/
	29
002eaee3	30	/----- Header files ------------------------------------------------------/
	31
	32	#include <ctype.h>
002eaee3	33	#include <math.h>
	34	#include <stdarg.h>
	35	#include <stdio.h>
	36	#include <stdlib.h>
	37	#include <string.h>
	38
5d45633f	39	#ifdef HAVE_FLOAT_H
	40	# include <float.h>
	41	#endif
	42
002eaee3	43	#include "dstr.h"
	44
	45	/----- Tunable constants -------------------------------------------------/
	46
	47	/*
	48	* For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured
	49	* before writing the formatted result.
	50	*/
	51
	52	#define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */
	53
	54	/----- Main code ---------------------------------------------------------/
	55
	56	/* --- @dstr_vputf@ --- *
	57	*
	58	* Arguments: @dstr *d@ = pointer to a dynamic string block
	59	* @const char *p@ = pointer to @printf@-style format string
5a18a126	60	* @va_list *ap@ = argument handle
002eaee3	61	*
	62	* Returns: The number of characters written to the string.
	63	*
	64	* Use: As for @dstr_putf@, but may be used as a back-end to user-
	65	* supplied functions with @printf@-style interfaces.
	66	*/
	67
5a18a126	68	int dstr_vputf(dstr d, const char p, va_list *ap)
002eaee3	69	{
	70	const char *q = p;
	71	size_t n = d->len;
	72	size_t sz;
	73	dstr dd = DSTR_INIT;
	74
	75	while (*p) {
	76	unsigned f;
	77	int wd, prec;
	78
393cf1d9	79	#define f_short 1u
	80	#define f_long 2u
	81	#define f_Long 4u
	82	#define f_wd 8u
	83	#define f_prec 16u
002eaee3	84
	85	/* --- Most stuff gets passed on through --- */
	86
	87	if (*p != '%') {
	88	p++;
	89	continue;
	90	}
	91
	92	/* --- Dump out what's between @q@ and @p@ --- */
	93
	94	DPUTM(d, q, p - q);
	95	p++;
	96
	97	/* --- Sort out the various silly flags and things --- */
	98
	99	DPUTC(&dd, '%');
	100	f = 0;
	101	sz = DSTR_PUTFSTEP;
	102
	103	for (;;) {
	104	switch (*p) {
	105
	106	/* --- Various simple flags --- */
	107
	108	case '+':
	109	case '-':
	110	case '#':
	111	case '0':
	112	goto putch;
	113	case 'h':
	114	f \|= f_short;
	115	goto putch;
	116	case 'l':
	117	f \|= f_long;
	118	goto putch;
	119	case 'L':
	120	f \|= f_Long;
	121	goto putch;
	122	case 0:
	123	goto finished;
	124
	125	/* --- Field widths and precision specifiers --- */
	126
	127	{
	128	int *ip;
	129
	130	case '.':
	131	DPUTC(&dd, '.');
	132	ip = &prec;
	133	f \|= f_prec;
	134	goto getnum;
	135	case '*':
	136	ip = &wd;
	137	f \|= f_wd;
	138	goto getnum;
	139	default:
	140	if (isdigit((unsigned char)*p)) {
	141	f \|= f_wd;
	142	ip = &wd;
	143	goto getnum;
	144	}
	145	DPUTC(d, *p);
	146	goto formatted;
	147	getnum:
148	*ip = 0;
149	if (p == '') {
5a18a126	150	ip = va_arg(ap, int);
002eaee3	151	DENSURE(&dd, DSTR_PUTFSTEP);
	152	dd.len += sprintf(dd.buf + dd.len, "%i", *ip);
	153	} else {
	154	ip = p - '0';
	155	DPUTC(&dd, *p);
	156	p++;
	157	while (isdigit((unsigned char)*p)) {
	158	DPUTC(&dd, *p);
	159	ip = 10 ip + p++ - '0';
	160	}
	161	}
	162	break;
	163	}
	164
	165	/* --- Output formatting --- */
	166
	167	case 'd': case 'i': case 'x': case 'X': case 'o': case 'u':
	168	DPUTC(&dd, *p);
	169	DPUTZ(&dd);
	170	if ((f & f_prec) && prec + 16 > sz)
	171	sz = prec + 16;
	172	if ((f & f_wd) && wd + 1> sz)
	173	sz = wd + 1;
	174	DENSURE(d, sz);
	175	if (f & f_long)
	176	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	177	va_arg(*ap, unsigned long));
002eaee3	178	else
002eaee3	179	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	180	va_arg(*ap, unsigned int));
002eaee3	181	goto formatted;
	182
	183	case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
5d45633f	184	#ifdef HAVE_FLOAT_H
002eaee3	185	DPUTC(&dd, *p);
	186	DPUTZ(&dd);
	187	if (*p == 'f') {
	188	size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16;
	189	if (mx > sz)
	190	sz = mx;
	191	}
393cf1d9	192	if (!(f & f_prec))
002eaee3	193	prec = 6;
393cf1d9	194	else
002eaee3	195	sz += prec + 16;
	196	if ((f & f_wd) && wd + 1 > sz)
	197	sz = wd + 1;
	198	DENSURE(d, sz);
	199	if (f & f_Long)
	200	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	201	va_arg(*ap, long double));
002eaee3	202	else
002eaee3	203	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	204	va_arg(*ap, double));
002eaee3	205	goto formatted;
5d45633f	206	#else
	207	DPUTS(d, "<no float support>");
	208	#endif
002eaee3	209
	210	case 'c':
	211	DPUTC(&dd, *p);
	212	DPUTZ(&dd);
	213	if ((f & f_wd) && wd + 1> sz)
	214	sz = wd + 1;
	215	DENSURE(d, sz);
	216	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	217	va_arg(*ap, unsigned));
002eaee3	218	goto formatted;
	219
	220	case 's': {
5a18a126	221	const char s = va_arg(ap, const char *);
002eaee3	222	sz = strlen(s);
	223	DPUTC(&dd, *p);
	224	DPUTZ(&dd);
	225	if (f & f_prec)
	226	sz = prec;
	227	if ((f & f_wd) && wd > sz)
	228	sz = wd;
	229	DENSURE(d, sz + 1);
	230	d->len += sprintf(d->buf + d->len, dd.buf, s);
	231	goto formatted;
	232	}
	233
	234	case 'p':
	235	DPUTC(&dd, *p);
	236	DPUTZ(&dd);
	237	if ((f & f_prec) && prec + 16 > sz)
	238	sz = prec + 16;
	239	if ((f & f_wd) && wd + 1> sz)
	240	sz = wd + 1;
	241	DENSURE(d, sz);
	242	d->len += sprintf(d->buf + d->len, dd.buf,
5a18a126	243	va_arg(ap, const void ));
002eaee3	244	goto formatted;
	245
	246	case 'n':
	247	if (f & f_long)
5a18a126	248	va_arg(ap, long *) = (long)(d->len - n);
002eaee3	249	else if (f & f_short)
5a18a126	250	va_arg(ap, short *) = (short)(d->len - n);
002eaee3	251	else
5a18a126	252	va_arg(ap, int *) = (int)(d->len - n);
002eaee3	253	goto formatted;
	254
	255	/* --- Other random stuff --- */
	256
	257	putch:
	258	DPUTC(&dd, *p);
	259	p++;
	260	break;
	261	}
	262	}
	263
	264	formatted:
	265	DRESET(&dd);
	266	q = ++p;
393cf1d9	267
	268	#undef f_short
	269	#undef f_long
	270	#undef f_Long
	271	#undef f_wd
	272	#undef f_prec
002eaee3	273	}
	274
	275	DPUTM(d, q, p - q);
	276	finished:
	277	DPUTZ(d);
	278	DDESTROY(&dd);
	279	return (d->len - n);
	280	}
	281
	282	/* --- @dstr_putf@ --- *
	283	*
	284	* Arguments: @dstr *d@ = pointer to a dynamic string block
	285	* @const char *p@ = pointer to @printf@-style format string
	286	* @...@ = argument handle
	287	*
	288	* Returns: The number of characters written to the string.
	289	*
	290	* Use: Writes a piece of text to a dynamic string, doing @printf@-
	291	* style substitutions as it goes. Intended to be robust if
	292	* faced with malicious arguments, but not if the format string
	293	* itself is malicious.
	294	*/
	295
	296	int dstr_putf(dstr d, const char p, ...)
	297	{
	298	int n;
	299	va_list ap;
	300	va_start(ap, p);
5a18a126	301	n = dstr_vputf(d, p, &ap);
002eaee3	302	va_end(ap);
	303	return (n);
	304	}
	305
	306	/----- That's all, folks -------------------------------------------------/