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/* msvcrt workarounds.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <stdio.h>
#include <stdckdint.h>
#include <stdlib.h>
#include <string.h>
/* Outputs N bytes starting at S to FP.
These N bytes are known to be followed by a NUL.
Finally frees the string at S.
Returns the number of written bytes. */
static size_t
workaround_fwrite0 (char *s, size_t n, FILE *fp)
{
const char *ptr = s;
/* Use fputs instead of fwrite, which is buggy in msvcrt. */
size_t written = 0;
while (n > 0)
{
size_t l = strlen (ptr); /* 0 <= l <= n */
if (l > 0)
{
if (fputs (ptr, fp) == EOF)
break;
written += l;
n -= l;
}
if (n == 0)
break;
if (fputc ('\0', fp) == EOF)
break;
written++;
n--;
ptr += l + 1;
}
free (s);
return written;
}
size_t
gl_consolesafe_fwrite (const void *ptr, size_t size, size_t nmemb, FILE *fp)
{
size_t nbytes;
if (ckd_mul (&nbytes, size, nmemb) || nbytes == 0)
/* Overflow, or nothing to do. */
return 0;
char *tmp = malloc (nbytes + 1);
if (tmp == NULL)
return 0;
memcpy (tmp, ptr, nbytes);
tmp[nbytes] = '\0';
size_t written = workaround_fwrite0 (tmp, nbytes, fp);
return written / size;
}
#if defined __MINGW32__ && __USE_MINGW_ANSI_STDIO
# include "fseterr.h"
# include <stdarg.h>
# if !HAVE_VASPRINTF
# include <errno.h>
/* The old mingw (before mingw-w64) does not have the vasprintf function.
Define a suitable replacement here, that supports the same format
specifiers as the mingw *printf functions. */
static int
vasprintf (char **resultp, const char *format, va_list args)
{
/* First try: Use a stack-allocated buffer. */
char buf[2048];
size_t bufsize = sizeof (buf);
int ret = __mingw_vsnprintf (buf, bufsize, format, args);
if (ret < 0)
return -1;
size_t nbytes = ret;
char *mem = (char *) malloc (nbytes + 1);
if (mem == NULL)
{
errno = ENOMEM;
return -1;
}
if (ret < bufsize)
{
/* The buffer was sufficiently large. */
memcpy (mem, buf, nbytes + 1);
}
else
{
/* Second try: Use the heap-allocated memory. */
ret = __mingw_vsnprintf (mem, nbytes + 1, format, args);
if (ret < 0)
{
int saved_errno = errno;
free (mem);
errno = saved_errno;
return -1;
}
if (ret != nbytes)
abort ();
}
*resultp = mem;
return nbytes;
}
# endif
/* Bypass the functions __mingw_[v][f]printf, that trigger a bug in msvcrt,
but without losing the support for modern format specifiers added by
__mingw_*printf. */
int
gl_consolesafe_fprintf (FILE *restrict fp, const char *restrict format, ...)
{
va_list args;
char *tmpstring;
va_start (args, format);
int result = vasprintf (&tmpstring, format, args);
va_end (args);
if (result >= 0)
{
if (workaround_fwrite0 (tmpstring, result, fp) < result)
result = -1;
}
else
fseterr (fp);
return result;
}
int
gl_consolesafe_printf (const char *restrict format, ...)
{
va_list args;
char *tmpstring;
va_start (args, format);
int result = vasprintf (&tmpstring, format, args);
va_end (args);
if (result >= 0)
{
if (workaround_fwrite0 (tmpstring, result, stdout) < result)
result = -1;
}
else
fseterr (stdout);
return result;
}
int
gl_consolesafe_vfprintf (FILE *restrict fp,
const char *restrict format, va_list args)
{
char *tmpstring;
int result = vasprintf (&tmpstring, format, args);
if (result >= 0)
{
if (workaround_fwrite0 (tmpstring, result, fp) < result)
result = -1;
}
else
fseterr (fp);
return result;
}
int
gl_consolesafe_vprintf (const char *restrict format, va_list args)
{
char *tmpstring;
int result = vasprintf (&tmpstring, format, args);
if (result >= 0)
{
if (workaround_fwrite0 (tmpstring, result, stdout) < result)
result = -1;
}
else
fseterr (stdout);
return result;
}
#endif
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