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libs/libc/stdio/lib_libsscanf.c: Initialized the lastc pointer to avoid the checks for NULL. Removed a bug in the floating point parsing which allowed several signs after each other.

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This commit is contained in:
Johannes 2019-02-14 15:43:21 -06:00 committed by Gregory Nutt
parent 69056d4053
commit 479363ae3b
1 changed files with 17 additions and 25 deletions
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42
libs/libc/stdio/lib_libsscanf.c
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@ -276,6 +276,13 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
modifier = NO_MOD;
ngetstart = obj->nget; /* for %n calculations */
/* Make sure lastc is not NULL. */
if (lastc == NULL)
{
lastc = &c;
}
/* Loop until all characters in the fmt string have been processed. We may
* have to continue loop after reaching the end the input data in order to
* handle trailing %n format specifiers.
@ -470,11 +477,7 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
if (!fwidth)
{
if (lastc != NULL)
{
*lastc = c;
}
*lastc = c;
return assigncount;
}
@ -538,11 +541,7 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
if (fwidth != width)
{
if (lastc != NULL)
{
*lastc = c;
}
*lastc = c;
return assigncount;
}
@ -875,11 +874,7 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
if (tmp == endptr || get_errno() == ERANGE)
{
if (lastc != NULL)
{
*lastc = c;
}
*lastc = c;
return assigncount;
}
@ -1027,6 +1022,7 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
if (!dot)
{
dot = true;
sign = true;
}
else
{
@ -1049,6 +1045,10 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
{
stopconv = true;
}
else
{
sign = true;
}
if (!stopconv)
{
@ -1084,11 +1084,7 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
if (tmp == endptr || get_errno() == ERANGE)
{
if (lastc != NULL)
{
*lastc = c;
}
*lastc = c;
return assigncount;
}
@ -1235,10 +1231,6 @@ int lib_vsscanf(FAR struct lib_instream_s *obj, FAR int *lastc,
* matching failure or conversion.
*/
if (lastc != NULL)
{
*lastc = c;
}
*lastc = c;
return (count || !conv) ? assigncount : EOF;
}