3 * $Id: dputf.c,v 1.4 2001/06/22 19:35:29 mdw Exp $
5 * `printf'-style formatting for dynamic strings
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
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.
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.
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,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.4 2001/06/22 19:35:29 mdw
34 * Find out whether @<float.h>@ exists (hack for uC-Linux).
36 * Revision 1.3 2001/01/20 12:06:01 mdw
37 * Define flags with macros, to ensure unsignedness.
39 * Revision 1.2 2000/08/15 21:26:45 mdw
40 * (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized.
42 * Revision 1.1 1999/10/04 21:44:47 mdw
43 * Move `dstr_putf' and `dstr_vputf' into a separate source file.
47 /*----- Header files ------------------------------------------------------*/
62 /*----- Tunable constants -------------------------------------------------*/
65 * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured
66 * before writing the formatted result.
69 #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */
71 /*----- Main code ---------------------------------------------------------*/
73 /* --- @dstr_vputf@ --- *
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
79 * Returns: The number of characters written to the string.
81 * Use: As for @dstr_putf@, but may be used as a back-end to user-
82 * supplied functions with @printf@-style interfaces.
85 int dstr_vputf(dstr *d, const char *p, va_list ap)
102 /* --- Most stuff gets passed on through --- */
109 /* --- Dump out what's between @q@ and @p@ --- */
114 /* --- Sort out the various silly flags and things --- */
123 /* --- Various simple flags --- */
142 /* --- Field widths and precision specifiers --- */
157 if (isdigit((unsigned char)*p)) {
167 *ip = va_arg(ap, int);
168 DENSURE(&dd, DSTR_PUTFSTEP);
169 dd.len += sprintf(dd.buf + dd.len, "%i", *ip);
174 while (isdigit((unsigned char)*p)) {
176 *ip = 10 * *ip + *p++ - '0';
182 /* --- Output formatting --- */
184 case 'd': case 'i': case 'x': case 'X': case 'o': case 'u':
187 if ((f & f_prec) && prec + 16 > sz)
189 if ((f & f_wd) && wd + 1> sz)
193 d->len += sprintf(d->buf + d->len, dd.buf,
194 va_arg(ap, unsigned long));
196 d->len += sprintf(d->buf + d->len, dd.buf,
197 va_arg(ap, unsigned int));
200 case 'e': case 'E': case 'f': case 'F': case 'g': case 'G':
205 size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16;
213 if ((f & f_wd) && wd + 1 > sz)
217 d->len += sprintf(d->buf + d->len, dd.buf,
218 va_arg(ap, long double));
220 d->len += sprintf(d->buf + d->len, dd.buf,
224 DPUTS(d, "<no float support>");
230 if ((f & f_wd) && wd + 1> sz)
233 d->len += sprintf(d->buf + d->len, dd.buf,
234 va_arg(ap, unsigned));
238 const char *s = va_arg(ap, const char *);
244 if ((f & f_wd) && wd > sz)
247 d->len += sprintf(d->buf + d->len, dd.buf, s);
254 if ((f & f_prec) && prec + 16 > sz)
256 if ((f & f_wd) && wd + 1> sz)
259 d->len += sprintf(d->buf + d->len, dd.buf,
260 va_arg(ap, const void *));
265 *va_arg(ap, long *) = (long)(d->len - n);
266 else if (f & f_short)
267 *va_arg(ap, short *) = (short)(d->len - n);
269 *va_arg(ap, int *) = (int)(d->len - n);
272 /* --- Other random stuff --- */
299 /* --- @dstr_putf@ --- *
301 * Arguments: @dstr *d@ = pointer to a dynamic string block
302 * @const char *p@ = pointer to @printf@-style format string
303 * @...@ = argument handle
305 * Returns: The number of characters written to the string.
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.
313 int dstr_putf(dstr *d, const char *p, ...)
318 n = dstr_vputf(d, p, ap);
323 /*----- That's all, folks -------------------------------------------------*/