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Add config to enable floating point support 

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@2542 7fd9a85b-ad96-42d3-883c-3090e2eb8679
This commit is contained in:
patacongo 2010-03-14 17:54:16 +00:00
parent 43cc55b080
commit cddeff97cc
4 changed files with 14 additions and 5 deletions
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4
nuttx/Documentation/NuttxPortingGuide.html
View File

@ -2397,6 +2397,10 @@ extern void up_ledoff(int led);
<code>CONFIG_NOPRINTF_FIELDWIDTH</code>: sprintf-related logic is a
little smaller if we do not support fieldwidthes
</li>
<li>
<code>CONFIG_LIBC_FLOATINGPOINT</code>: By default, floating point
support in printf, sscanf, etc. is disabled.
</li>
</ul>
<h2>Allow for architecture optimized implementations</h2>

2
nuttx/configs/README.txt
View File

@ -282,6 +282,8 @@ defconfig -- This is a configuration file similar to the Linux
CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
little smaller if we do not support fieldwidthes
CONFIG_LIBC_FLOATINGPOINT - By default, floating point
support in printf, sscanf, etc. is disabled.
Allow for architecture optimized implementations

2
nuttx/lib/lib_libvsprintf.c
View File

@ -1465,12 +1465,14 @@ int lib_vsprintf(FAR struct lib_outstream_s *obj, const char *src, va_list ap)
/* Handle floating point conversions */
#ifdef CONFIG_LIBC_FLOATINGPOINT
else if (strchr("eEfgG", *src))
{
#ifdef CONFIG_CPP_HAVE_WARNING
# warning "No floating point support"
#endif
}
#endif
}
return obj->nput;

11
nuttx/lib/lib_sscanf.c
View File

@ -260,10 +260,9 @@ int vsscanf(char *buf, const char *s, va_list ap)
else if (*s == 'f')
{
#if 1
# ifdef CONFIG_CPP_HAVE_WARNING
# warning "No floating point conversions"
# endif
#ifndef CONFIG_LIBC_FLOATINGPOINT
/* No floating point conversions */
void *pv = va_arg(ap, void*);
lvdbg("vsscanf: Return 0.0 to %p\n", pv);
@ -331,7 +330,9 @@ int vsscanf(char *buf, const char *s, va_list ap)
}
if (!noassign)
count++;
{
count++;
}
width = noassign = lflag = 0;
s++;
}