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sscanf(): Was returning the wrong number of conversions in many cases; Also, needs to return EOF if there were no conversions

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This commit is contained in:
Gregory Nutt 2014-03-30 14:24:38 -06:00
parent 85b0a1a544
commit 6bb8cc02df
2 changed files with 19 additions and 11 deletions
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3
ChangeLog
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@ -7084,4 +7084,7 @@
own file (2014-3-30).
* arch/arm/src/sama5/sam_boot.c: Fix some backward conditional
compilation (2014-3-30).
* libc/stdio/lib_sccanf.c: Fix a counting error in the return
value from sscanf(). Noted by kfrolov. Also, sscanf() should
return EOF if no values were converted (2014-3-30).

27
libc/stdio/lib_sscanf.c
View File

@ -271,7 +271,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
* update the 'ap' variable.
*/
tv = NULL; /* To avoid warnings about beign uninitialized */
tv = NULL; /* To avoid warnings about begin uninitialized */
if (!noassign)
{
tv = va_arg(ap, char*);
@ -307,6 +307,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
{
strncpy(tv, buf, width);
tv[width] = '\0';
count++;
}
/* Update the buffer pointer past the string in the input */
@ -339,7 +340,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
if (*buf)
{
/* Was a fieldwidth specified? */
/* Was a field width specified? */
if (!width)
{
@ -354,6 +355,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
{
strncpy(tv, buf, width);
tv[width] = '\0';
count++;
}
/* Update the buffer pointer past the character(s) in the
@ -396,7 +398,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
}
}
/* But we only perform the data conversion is we still have
/* But we only perform the data conversion if we still have
* bytes remaining in the input data stream.
*/
@ -489,6 +491,8 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
tmplong, pint);
*pint = (int)tmplong;
}
count++;
}
}
}
@ -601,6 +605,8 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
lvdbg("vsscanf: Return %f to %p\n", dvalue, pf);
*pf = (float)dvalue;
}
count++;
}
}
#endif
@ -616,6 +622,8 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
{
size_t nchars = (size_t)(buf - bufstart);
/* Note %n does not count as a conversion */
if (lflag)
{
FAR long *plong = va_arg(ap, long*);
@ -629,13 +637,6 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
}
}
/* Note %n does not count as a conversion */
if (!noassign && *fmt != 'n')
{
count++;
}
width = 0;
noassign = false;
lflag = false;
@ -674,5 +675,9 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
}
}
return count;
/* sscanf is required to return EOF if the input ends before the first
* matching failure or conversion.
*/
return count ? count : EOF;
}