1 /*
2 * Copyright (c) 2012 - 2014 Tony Finch <dot@dotat.at>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include "unifdef.h"
27
28 /*
29 * The Windows implementation of rename() fails if the new filename
30 * already exists. Atomic replacement is not really needed, so just
31 * remove anything that might be in the way before renaming.
32 */
33 int
replace(const char * oldname,const char * newname)34 replace(const char *oldname, const char *newname)
35 {
36 if (remove(newname) < 0 && errno != ENOENT)
37 warn("can't remove \"%s\"", newname);
38 return (rename(oldname, newname));
39 }
40
41 FILE *
mktempmode(char * tmp,int mode)42 mktempmode(char *tmp, int mode)
43 {
44 mode = mode;
45 return (fopen(_mktemp(tmp), "wb"));
46 }
47
48 FILE *
fbinmode(FILE * fp)49 fbinmode(FILE *fp)
50 {
51 _setmode(_fileno(fp), _O_BINARY);
52 return (fp);
53 }
54
55 /*
56 * This is more long-winded than seems necessary because MinGW
57 * doesn't have a proper implementation of _vsnprintf_s().
58 *
59 * This link has some useful info about snprintf() on Windows:
60 * http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010
61 */
c99_snprintf(char * buf,size_t buflen,const char * format,...)62 int c99_snprintf(char *buf, size_t buflen, const char *format, ...)
63 {
64 va_list ap;
65 int outlen, cpylen, tmplen;
66 char *tmp;
67
68 va_start(ap, format);
69 outlen = _vscprintf(format, ap);
70 va_end(ap);
71 if (buflen == 0 || outlen < 0)
72 return outlen;
73 if (buflen > outlen)
74 cpylen = outlen;
75 else
76 cpylen = buflen - 1;
77 /* Paranoia about off-by-one errors in _snprintf() */
78 tmplen = outlen + 2;
79
80 tmp = (char *)malloc(tmplen);
81 if (tmp == NULL)
82 err(2, "malloc");
83 va_start(ap, format);
84 _vsnprintf(tmp, tmplen, format, ap);
85 va_end(ap);
86 memcpy(buf, tmp, cpylen);
87 buf[cpylen] = '\0';
88 free(tmp);
89
90 return outlen;
91 }
92