[mLib] / dputf.c

/* -*-c-*-
 *
 * $Id: dputf.c,v 1.2 2000/08/15 21:26:45 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 1.2  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 <float.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#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;

    enum {
      f_short = 1,
      f_long = 2,
      f_Long = 4,
      f_wd = 8,
      f_prec = 16
    };

    /* --- 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':
	  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) == 0)
	    prec = 6;
	  if ((f & f_prec))
	    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;

	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;
  }

  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	*
e12e2b8d	3	* $Id: dputf.c,v 1.2 2000/08/15 21:26:45 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 $
e12e2b8d	33	* Revision 1.2 2000/08/15 21:26:45 mdw
	34	* (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized.
	35	*
002eaee3	36	* Revision 1.1 1999/10/04 21:44:47 mdw
	37	* Move `dstr_putf' and `dstr_vputf' into a separate source file.
	38	*
	39	*/
	40
	41	/----- Header files ------------------------------------------------------/
	42
	43	#include <ctype.h>
	44	#include <float.h>
	45	#include <math.h>
	46	#include <stdarg.h>
	47	#include <stdio.h>
	48	#include <stdlib.h>
	49	#include <string.h>
	50
	51	#include "dstr.h"
	52
	53	/----- Tunable constants -------------------------------------------------/
	54
	55	/*
	56	* For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured
	57	* before writing the formatted result.
	58	*/
	59
	60	#define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */
	61
	62	/----- Main code ---------------------------------------------------------/
	63
	64	/* --- @dstr_vputf@ --- *
	65	*
	66	* Arguments: @dstr *d@ = pointer to a dynamic string block
	67	* @const char *p@ = pointer to @printf@-style format string
	68	* @va_list ap@ = argument handle
	69	*
	70	* Returns: The number of characters written to the string.
	71	*
	72	* Use: As for @dstr_putf@, but may be used as a back-end to user-
	73	* supplied functions with @printf@-style interfaces.
	74	*/
	75
	76	int dstr_vputf(dstr d, const char p, va_list ap)
	77	{
	78	const char *q = p;
	79	size_t n = d->len;
	80	size_t sz;
	81	dstr dd = DSTR_INIT;
	82
	83	while (*p) {
	84	unsigned f;
	85	int wd, prec;
	86
	87	enum {
	88	f_short = 1,
	89	f_long = 2,
	90	f_Long = 4,
	91	f_wd = 8,
	92	f_prec = 16
	93	};
	94
	95	/* --- Most stuff gets passed on through --- */
	96
	97	if (*p != '%') {
	98	p++;
	99	continue;
100	}
101
102	/* --- Dump out what's between @q@ and @p@ --- */
103
104	DPUTM(d, q, p - q);
105	p++;
106
107	/* --- Sort out the various silly flags and things --- */
108
109	DPUTC(&dd, '%');
110	f = 0;
111	sz = DSTR_PUTFSTEP;
112
113	for (;;) {
114	switch (*p) {
115
116	/* --- Various simple flags --- */
117
118	case '+':
119	case '-':
120	case '#':
121	case '0':
122	goto putch;
123	case 'h':
124	f \|= f_short;
125	goto putch;
126	case 'l':
127	f \|= f_long;
128	goto putch;
129	case 'L':
130	f \|= f_Long;
131	goto putch;
132	case 0:
133	goto finished;
134
135	/* --- Field widths and precision specifiers --- */
136
137	{
138	int *ip;
139
140	case '.':
141	DPUTC(&dd, '.');
142	ip = &prec;
143	f \|= f_prec;
144	goto getnum;
145	case '*':
146	ip = &wd;
147	f \|= f_wd;
148	goto getnum;
149	default:
150	if (isdigit((unsigned char)*p)) {
151	f \|= f_wd;
152	ip = &wd;
153	goto getnum;
154	}
155	DPUTC(d, *p);
156	goto formatted;
157	getnum:
158	*ip = 0;
159	if (p == '') {
160	*ip = va_arg(ap, int);
161	DENSURE(&dd, DSTR_PUTFSTEP);
162	dd.len += sprintf(dd.buf + dd.len, "%i", *ip);
163	} else {
164	ip = p - '0';
165	DPUTC(&dd, *p);
166	p++;
167	while (isdigit((unsigned char)*p)) {
168	DPUTC(&dd, *p);
169	ip = 10 ip + p++ - '0';
170	}
171	}
172	break;
173	}
174
175	/* --- Output formatting --- */
176
177	case 'd': case 'i': case 'x': case 'X': case 'o': case 'u':
178	DPUTC(&dd, *p);
179	DPUTZ(&dd);
180	if ((f & f_prec) && prec + 16 > sz)
181	sz = prec + 16;
182	if ((f & f_wd) && wd + 1> sz)
183	sz = wd + 1;
184	DENSURE(d, sz);
185	if (f & f_long)
186	d->len += sprintf(d->buf + d->len, dd.buf,
187	va_arg(ap, unsigned long));
188	else
189	d->len += sprintf(d->buf + d->len, dd.buf,
190	va_arg(ap, unsigned int));
191	goto formatted;
192
193	case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
194	DPUTC(&dd, *p);
195	DPUTZ(&dd);
196	if (*p == 'f') {
197	size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16;
198	if (mx > sz)
199	sz = mx;
200	}
201	if ((f & f_prec) == 0)
202	prec = 6;
203	if ((f & f_prec))
204	sz += prec + 16;
205	if ((f & f_wd) && wd + 1 > sz)
206	sz = wd + 1;
207	DENSURE(d, sz);
208	if (f & f_Long)
209	d->len += sprintf(d->buf + d->len, dd.buf,
210	va_arg(ap, long double));
211	else
212	d->len += sprintf(d->buf + d->len, dd.buf,
213	va_arg(ap, double));
214	goto formatted;
215
216	case 'c':
217	DPUTC(&dd, *p);
218	DPUTZ(&dd);
219	if ((f & f_wd) && wd + 1> sz)
220	sz = wd + 1;
221	DENSURE(d, sz);
222	d->len += sprintf(d->buf + d->len, dd.buf,
e12e2b8d	223	va_arg(ap, unsigned));
002eaee3	224	goto formatted;
	225
	226	case 's': {
	227	const char s = va_arg(ap, const char );
	228	sz = strlen(s);
	229	DPUTC(&dd, *p);
	230	DPUTZ(&dd);
	231	if (f & f_prec)
	232	sz = prec;
	233	if ((f & f_wd) && wd > sz)
	234	sz = wd;
	235	DENSURE(d, sz + 1);
	236	d->len += sprintf(d->buf + d->len, dd.buf, s);
	237	goto formatted;
	238	}
	239
	240	case 'p':
	241	DPUTC(&dd, *p);
	242	DPUTZ(&dd);
	243	if ((f & f_prec) && prec + 16 > sz)
	244	sz = prec + 16;
	245	if ((f & f_wd) && wd + 1> sz)
	246	sz = wd + 1;
	247	DENSURE(d, sz);
	248	d->len += sprintf(d->buf + d->len, dd.buf,
	249	va_arg(ap, const void *));
	250	goto formatted;
	251
	252	case 'n':
	253	if (f & f_long)
	254	va_arg(ap, long ) = (long)(d->len - n);
	255	else if (f & f_short)
	256	va_arg(ap, short ) = (short)(d->len - n);
	257	else
	258	va_arg(ap, int ) = (int)(d->len - n);
	259	goto formatted;
	260
	261	/* --- Other random stuff --- */
	262
	263	putch:
	264	DPUTC(&dd, *p);
	265	p++;
	266	break;
	267	}
	268	}
	269
	270	formatted:
	271	DRESET(&dd);
	272	q = ++p;
	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);
301	n = dstr_vputf(d, p, ap);
302	va_end(ap);
303	return (n);
304	}
305
306	/----- That's all, folks -------------------------------------------------/