[mLib] / dputf.c

/* -*-c-*-
 *
 * $Id: dputf.c,v 1.4 2001/06/22 19:35:29 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.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: dputf.c,v $
 * Revision 1.4  2001/06/22 19:35:29  mdw
 * Find out whether @<float.h>@ exists (hack for uC-Linux).
 *
 * Revision 1.3  2001/01/20 12:06:01  mdw
 * Define flags with macros, to ensure unsignedness.
 *
 * Revision 1.2  2000/08/15 21:26:45  mdw
 * (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized.
 *
 * Revision 1.1  1999/10/04 21:44:47  mdw
 * Move `dstr_putf' and `dstr_vputf' into a separate source file.
 *
 */

/*----- 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	*
5d45633f	3	* $Id: dputf.c,v 1.4 2001/06/22 19:35:29 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
	30	/----- Revision history --------------------------------------------------
	31	*
	32	* $Log: dputf.c,v $
5d45633f	33	* Revision 1.4 2001/06/22 19:35:29 mdw
	34	* Find out whether @<float.h>@ exists (hack for uC-Linux).
	35	*
393cf1d9	36	* Revision 1.3 2001/01/20 12:06:01 mdw
	37	* Define flags with macros, to ensure unsignedness.
	38	*
e12e2b8d	39	* Revision 1.2 2000/08/15 21:26:45 mdw
	40	* (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized.
	41	*
002eaee3	42	* Revision 1.1 1999/10/04 21:44:47 mdw
	43	* Move `dstr_putf' and `dstr_vputf' into a separate source file.
	44	*
	45	*/
	46
	47	/----- Header files ------------------------------------------------------/
	48
	49	#include <ctype.h>
002eaee3	50	#include <math.h>
	51	#include <stdarg.h>
	52	#include <stdio.h>
	53	#include <stdlib.h>
	54	#include <string.h>
	55
5d45633f	56	#ifdef HAVE_FLOAT_H
	57	# include <float.h>
	58	#endif
	59
002eaee3	60	#include "dstr.h"
	61
	62	/----- Tunable constants -------------------------------------------------/
	63
	64	/*
	65	* For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured
	66	* before writing the formatted result.
	67	*/
	68
	69	#define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */
	70
	71	/----- Main code ---------------------------------------------------------/
	72
	73	/* --- @dstr_vputf@ --- *
	74	*
	75	* Arguments: @dstr *d@ = pointer to a dynamic string block
	76	* @const char *p@ = pointer to @printf@-style format string
	77	* @va_list ap@ = argument handle
	78	*
	79	* Returns: The number of characters written to the string.
	80	*
	81	* Use: As for @dstr_putf@, but may be used as a back-end to user-
	82	* supplied functions with @printf@-style interfaces.
	83	*/
	84
	85	int dstr_vputf(dstr d, const char p, va_list ap)
	86	{
	87	const char *q = p;
	88	size_t n = d->len;
	89	size_t sz;
	90	dstr dd = DSTR_INIT;
	91
	92	while (*p) {
	93	unsigned f;
	94	int wd, prec;
	95
393cf1d9	96	#define f_short 1u
	97	#define f_long 2u
	98	#define f_Long 4u
	99	#define f_wd 8u
	100	#define f_prec 16u
002eaee3	101
	102	/* --- Most stuff gets passed on through --- */
	103
	104	if (*p != '%') {
	105	p++;
	106	continue;
	107	}
	108
	109	/* --- Dump out what's between @q@ and @p@ --- */
	110
	111	DPUTM(d, q, p - q);
	112	p++;
	113
	114	/* --- Sort out the various silly flags and things --- */
	115
	116	DPUTC(&dd, '%');
	117	f = 0;
	118	sz = DSTR_PUTFSTEP;
	119
	120	for (;;) {
	121	switch (*p) {
	122
	123	/* --- Various simple flags --- */
	124
	125	case '+':
	126	case '-':
	127	case '#':
	128	case '0':
	129	goto putch;
	130	case 'h':
	131	f \|= f_short;
	132	goto putch;
	133	case 'l':
	134	f \|= f_long;
	135	goto putch;
	136	case 'L':
	137	f \|= f_Long;
	138	goto putch;
	139	case 0:
	140	goto finished;
	141
	142	/* --- Field widths and precision specifiers --- */
	143
	144	{
	145	int *ip;
	146
	147	case '.':
	148	DPUTC(&dd, '.');
	149	ip = &prec;
	150	f \|= f_prec;
	151	goto getnum;
	152	case '*':
	153	ip = &wd;
	154	f \|= f_wd;
	155	goto getnum;
	156	default:
	157	if (isdigit((unsigned char)*p)) {
	158	f \|= f_wd;
	159	ip = &wd;
	160	goto getnum;
	161	}
	162	DPUTC(d, *p);
	163	goto formatted;
	164	getnum:
165	*ip = 0;
166	if (p == '') {
167	*ip = va_arg(ap, int);
168	DENSURE(&dd, DSTR_PUTFSTEP);
169	dd.len += sprintf(dd.buf + dd.len, "%i", *ip);
170	} else {
171	ip = p - '0';
172	DPUTC(&dd, *p);
173	p++;
174	while (isdigit((unsigned char)*p)) {
175	DPUTC(&dd, *p);
176	ip = 10 ip + p++ - '0';
177	}
178	}
179	break;
180	}
181
182	/* --- Output formatting --- */
183
184	case 'd': case 'i': case 'x': case 'X': case 'o': case 'u':
185	DPUTC(&dd, *p);
186	DPUTZ(&dd);
187	if ((f & f_prec) && prec + 16 > sz)
188	sz = prec + 16;
189	if ((f & f_wd) && wd + 1> sz)
190	sz = wd + 1;
191	DENSURE(d, sz);
192	if (f & f_long)
193	d->len += sprintf(d->buf + d->len, dd.buf,
194	va_arg(ap, unsigned long));
195	else
196	d->len += sprintf(d->buf + d->len, dd.buf,
197	va_arg(ap, unsigned int));
198	goto formatted;
199
200	case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
5d45633f	201	#ifdef HAVE_FLOAT_H
002eaee3	202	DPUTC(&dd, *p);
	203	DPUTZ(&dd);
	204	if (*p == 'f') {
	205	size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16;
	206	if (mx > sz)
	207	sz = mx;
	208	}
393cf1d9	209	if (!(f & f_prec))
002eaee3	210	prec = 6;
393cf1d9	211	else
002eaee3	212	sz += prec + 16;
	213	if ((f & f_wd) && wd + 1 > sz)
	214	sz = wd + 1;
	215	DENSURE(d, sz);
	216	if (f & f_Long)
	217	d->len += sprintf(d->buf + d->len, dd.buf,
	218	va_arg(ap, long double));
	219	else
	220	d->len += sprintf(d->buf + d->len, dd.buf,
	221	va_arg(ap, double));
	222	goto formatted;
5d45633f	223	#else
	224	DPUTS(d, "<no float support>");
	225	#endif
002eaee3	226
	227	case 'c':
	228	DPUTC(&dd, *p);
	229	DPUTZ(&dd);
	230	if ((f & f_wd) && wd + 1> sz)
	231	sz = wd + 1;
	232	DENSURE(d, sz);
	233	d->len += sprintf(d->buf + d->len, dd.buf,
e12e2b8d	234	va_arg(ap, unsigned));
002eaee3	235	goto formatted;
	236
	237	case 's': {
	238	const char s = va_arg(ap, const char );
	239	sz = strlen(s);
	240	DPUTC(&dd, *p);
	241	DPUTZ(&dd);
	242	if (f & f_prec)
	243	sz = prec;
	244	if ((f & f_wd) && wd > sz)
	245	sz = wd;
	246	DENSURE(d, sz + 1);
	247	d->len += sprintf(d->buf + d->len, dd.buf, s);
	248	goto formatted;
	249	}
	250
	251	case 'p':
	252	DPUTC(&dd, *p);
	253	DPUTZ(&dd);
	254	if ((f & f_prec) && prec + 16 > sz)
	255	sz = prec + 16;
	256	if ((f & f_wd) && wd + 1> sz)
	257	sz = wd + 1;
	258	DENSURE(d, sz);
	259	d->len += sprintf(d->buf + d->len, dd.buf,
	260	va_arg(ap, const void *));
	261	goto formatted;
	262
	263	case 'n':
	264	if (f & f_long)
	265	va_arg(ap, long ) = (long)(d->len - n);
	266	else if (f & f_short)
	267	va_arg(ap, short ) = (short)(d->len - n);
	268	else
	269	va_arg(ap, int ) = (int)(d->len - n);
	270	goto formatted;
	271
	272	/* --- Other random stuff --- */
	273
	274	putch:
	275	DPUTC(&dd, *p);
	276	p++;
	277	break;
	278	}
	279	}
	280
	281	formatted:
	282	DRESET(&dd);
	283	q = ++p;
393cf1d9	284
	285	#undef f_short
	286	#undef f_long
	287	#undef f_Long
	288	#undef f_wd
	289	#undef f_prec
002eaee3	290	}
	291
	292	DPUTM(d, q, p - q);
	293	finished:
	294	DPUTZ(d);
	295	DDESTROY(&dd);
	296	return (d->len - n);
	297	}
	298
	299	/* --- @dstr_putf@ --- *
	300	*
	301	* Arguments: @dstr *d@ = pointer to a dynamic string block
	302	* @const char *p@ = pointer to @printf@-style format string
	303	* @...@ = argument handle
	304	*
	305	* Returns: The number of characters written to the string.
	306	*
	307	* Use: Writes a piece of text to a dynamic string, doing @printf@-
	308	* style substitutions as it goes. Intended to be robust if
	309	* faced with malicious arguments, but not if the format string
	310	* itself is malicious.
	311	*/
	312
	313	int dstr_putf(dstr d, const char p, ...)
	314	{
	315	int n;
	316	va_list ap;
	317	va_start(ap, p);
	318	n = dstr_vputf(d, p, ap);
	319	va_end(ap);
	320	return (n);
	321	}
	322
	323	/----- That's all, folks -------------------------------------------------/