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 <stdlib.h>
37 #include <string.h>
38 #include "stdio_private.h"
39
strfroml(char * restrict str,size_t n,const char * restrict format,long double fp)40 int strfroml(char *restrict str, size_t n,
41 const char *restrict format, long double fp)
42 {
43 char nformat[32];
44 const char *f;
45 bool found_percent;
46 bool inserted_L;
47 char *nf;
48
49 /* if there's not space for a replacement format, just bail */
50 if (strlen(format) > sizeof(nformat) - 2)
51 return __d_snprintf(str, n, format, (double) fp);
52 nf = nformat;
53 f = format;
54 found_percent = false;
55 inserted_L = false;
56 while (*f) {
57 char c = *f++;
58 switch (c) {
59 case '%':
60 found_percent = true;
61 break;
62 case 'e': case 'E':
63 case 'f': case 'F':
64 case 'g': case 'G':
65 case 'a': case 'A':
66 if (found_percent && !inserted_L) {
67 *nf++ = 'L';
68 inserted_L = true;
69 }
70 found_percent = false;
71 break;
72 default:
73 break;
74 }
75 *nf++ = c;
76 }
77 *nf = '\0';
78 return __d_snprintf(str, n, nformat, fp);
79 }
80
