1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2021 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include "stdio_private.h"
37
strfroml(char * restrict str,size_t n,const char * restrict format,long double fp)38 int strfroml(char *restrict str, size_t n,
39 const char *restrict format, long double fp)
40 {
41 char nformat[32];
42 const char *f;
43 bool found_percent;
44 bool inserted_L;
45 char *nf;
46
47 /* if there's not space for a replacement format, just bail */
48 if (strlen(format) > sizeof(nformat) - 2)
49 return __d_snprintf(str, n, format, (double) fp);
50 nf = nformat;
51 f = format;
52 found_percent = false;
53 inserted_L = false;
54 while (*f) {
55 char c = *f++;
56 switch (c) {
57 case '%':
58 found_percent = true;
59 break;
60 case 'e': case 'E':
61 case 'f': case 'F':
62 case 'g': case 'G':
63 case 'a': case 'A':
64 if (found_percent && !inserted_L) {
65 *nf++ = 'L';
66 inserted_L = true;
67 }
68 found_percent = false;
69 break;
70 default:
71 break;
72 }
73 *nf++ = c;
74 }
75 *nf = '\0';
76 return __d_snprintf(str, n, nformat, fp);
77 }
78
