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strncpy would fail if n==0

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This commit is contained in:
Gregory Nutt 2014-03-28 15:17:43 -06:00
parent f12e37cae4
commit a0b330bd92
2 changed files with 24 additions and 22 deletions
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34
libc/stdio/lib_sscanf.c
View File

@ -72,23 +72,23 @@
* Private Function Prototypes
****************************************************************************/
/**************************************************************************
/****************************************************************************
* Global Function Prototypes
****************************************************************************/
int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap);
/**************************************************************************
/****************************************************************************
* Global Constant Data
**************************************************************************/
****************************************************************************/
/****************************************************************************
* Global Variables
****************************************************************************/
/**************************************************************************
/****************************************************************************
* Private Constant Data
**************************************************************************/
****************************************************************************/
static const char spaces[] = " \t\n\r\f\v";
@ -136,14 +136,14 @@ static int findwidth(FAR const char *buf, FAR const char *fmt)
}
}
/* No... the format has not delimiter and is back-to-back with the next
* formats (or no is following by a delimiter that does not exist in the
/* No... the format has no delimiter and is back-to-back with the next
* format (or is followed by a delimiter that does not exist in the
* input string). At this point we just bail and Use the input up until
* the first white space is encountered.
*
* NOTE: This means that values from the following format may be
* concatenated with the first. This is a bug. We have no generic way of
* determining the width of the data if there is no fieldwith, no space
* determining the width of the data if there is no fieldwidth, no space
* separating the input, and no usable delimiter character.
*/
@ -284,6 +284,8 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
if (*buf)
{
/* Skip over white space */
while (isspace(*buf))
{
buf++;
@ -303,11 +305,7 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
if (!noassign)
{
if (width > 0)
{
strncpy(tv, buf, width);
}
strncpy(tv, buf, width);
tv[width] = '\0';
}
@ -456,9 +454,9 @@ int vsscanf(FAR const char *buf, FAR const char *fmt, va_list ap)
buf += width;
if (!noassign)
{
char *endptr;
int errsave;
long tmplong;
FAR char *endptr;
int errsave;
long tmplong;
errsave = errno;
set_errno(0);

12
libc/string/lib_strncpy.c
View File

@ -1,7 +1,7 @@
/************************************************************
* libc/string/lib_strncpy.c
*
* Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2011, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -42,16 +42,20 @@
#include <string.h>
/************************************************************
* Global Functions
* Public Functions
************************************************************/
/************************************************************
* Name: strncpy
************************************************************/
#ifndef CONFIG_ARCH_STRNCPY
char *strncpy(char *dest, const char *src, size_t n)
char *strncpy(FAR char *dest, FAR const char *src, size_t n)
{
char *ret = dest; /* Value to be returned */
char *end = dest + n; /* End of dest buffer + 1 byte */
while ((*dest++ = *src++) != '\0' && dest != end);
while (dest != end && (*dest++ = *src++) != '\0');
return ret;
}
#endif