From: Aschref Ben Thabet <aschref.ben-tha...@embedded-brains.de>
The warning may be because you're passing a char to the isspace() macro. The
implementation of isspace() may be via array indexing. (The argument to the
isspace()/isdegit() macro is defined to be an unsigned char the value of which
can fit in an unsignedchar).
at ctype.h in GNU libc, and while there's a complicated mess of macros and
functions, somewhere in the definition of isspace() there's an array being
indexed.
See if isspace((unsigned char) *str) gets rid of the warning.
The line array[c] is very likely a bug, because the type char can be signed or
unsigned—it's up to the compiler. If char is signed, then it's possible for c
to be negative, in which case accessing a negative array index leads to
Undefined Behavior.
---
cpukit/libdl/rtl-archive.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/cpukit/libdl/rtl-archive.c b/cpukit/libdl/rtl-archive.c
index eb7641b034..8f280157ff 100644
--- a/cpukit/libdl/rtl-archive.c
+++ b/cpukit/libdl/rtl-archive.c
@@ -516,13 +516,13 @@ rtems_rtl_archives_load_config (rtems_rtl_archives*
archives)
{
size_t ls = strlen (&s[r]);
size_t b = 0;
- while (b < ls && isspace (s[r + b]))
+ while (b < ls && isspace((unsigned char)(s[r + b])))
{
s[r + b] = '\0';
++b;
}
b = ls - 1;
- while (b > 0 && isspace (s[r + b]))
+ while (b > 0 && isspace((unsigned char)(s[r + b])))
{
s[r + b] = '\0';
--b;
--
2.26.2
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