QA·C Help - 2845

	2845	Constant: Maximum number of characters to be written is larger than the target buffer size.

Arrays

Certain standard library functions specify a maximum number (M) of characters to be written to a char array (A).

function	A parameter number	M parameter number
asctime_s	1	2
ctime_s	1	2
snprintf	1	2
snprintf_s	1	2
strcpy_s	1	2
strncat	1	3
strncat_s	1	2
strncat_s	1	4
strncat_s	3	4
strncpy	1	3
strncpy_s	1	4

This message is issued whenever a constant expression is used for M and the size of object A is smaller than M. This may result in an access outside the bounds of A.

For example:


/*PRQA S 1-9999 ++*/
/*PRQA S 2845 --*/

#include <string.h>

extern char a[10];
extern char b[11];

void foo (void)
{
  strncpy (a, b, sizeof (b));   /* 2845 */
}

MISRA C:2012 Rules applicable to message 2845:

Dir-4.1 (Required)

Run-time failures shall be minimized

See also:

2846 Definite: Maximum number of characters to be written is larger than the target buffer size.
2847 Apparent: Maximum number of characters to be written is larger than the target buffer size.
2848 Suspicious: Maximum number of characters to be written is larger than the target buffer size.

QA·C Source Code Analyser 8.1
MISRA C:2012 Compliance Module 1.0
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