1 /*
2 * Copyright (c) 2026 Faraz Vahedi <kfv@kfv.io>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7 #include <ctype.h>
8 #include <stdlib.h>
9
10 #include "strfrom.h"
11
12 int
strfromd(char * __restrict s,size_t n,const char * __restrict fmt,double fp)13 strfromd(char * __restrict s, size_t n, const char * __restrict fmt, double fp)
14 {
15 char conv, lc, *digits, *dend;
16 int prec, decpt, signflag, ret, mode, ndig_req;
17
18 conv = __sf_parse_fmt(fmt, &prec);
19 if (conv == '\0')
20 return (__sf_edoofus(s, n));
21 lc = tolower((unsigned char)conv);
22
23 if (lc == 'a') {
24 digits = __hdtoa(fp, __sf_xdigits(conv),
25 prec >= 0 ? prec + 1 : -1, &decpt, &signflag, &dend);
26 ret = __sf_render_hex(s, n, conv, prec, digits, dend, decpt,
27 signflag);
28 freedtoa(digits);
29 return (ret);
30 }
31
32 if (prec < 0)
33 prec = 6;
34
35 __sf_decimal_mode(lc, prec, &mode, &ndig_req);
36
37 digits = dtoa(fp, mode, ndig_req, &decpt, &signflag, &dend);
38
39 ret = __sf_render_decimal(s, n, conv, lc, prec, digits, dend, decpt,
40 signflag, decpt == 9999);
41
42 freedtoa(digits);
43
44 return (ret);
45 }
46