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lib: errno: avoid error format-overflow

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In cmd/regulator.c an error occurs with GCC 9.2.1 if CONFIG_ERRNO_STR is
not defined:

cmd/regulator.c: In function ‘failure’:
cmd/regulator.c:20:2: error: ‘%s’ directive argument is null
[-Werror=format-overflow=]
   20 |  printf("Error: %d (%s)\n", ret, errno_str(ret));
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘constraint’,
    inlined from ‘constraint’ at cmd/regulator.c:111:12:
cmd/regulator.c:115:3: error: ‘%s’ directive argument is null
[-Werror=format-overflow=]
  115 |   printf(" %s (err: %d)\n", errno_str(val), val);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

errno_str() should return a valid string instead of NULL if
CONFIG_ERRNO_STR is not defined.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-10-06 13:58:57 +02:00 committed by Tom Rini
parent eb5b63f369
commit f279e1d916
1 changed files with 10 additions and 1 deletions
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11
include/errno.h
View file

@ -12,12 +12,21 @@ extern int errno;
#define __set_errno(val) do { errno = val; } while (0)
/**
* errno_str() - get description for error number
*
* @errno: error number (negative in case of error)
* Return: string describing the error. If CONFIG_ERRNO_STR is not
* defined an empty string is returned.
*/
#ifdef CONFIG_ERRNO_STR
const char *errno_str(int errno);
#else
static const char error_message[] = "";
static inline const char *errno_str(int errno)
{
return 0;
return error_message;
}
#endif
#endif /* _ERRNO_H */