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cutils: Provide strchrnul

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strchrnul is a GNU extension and thus unavailable on a number of targets.
In the review for a commit removing strchrnul from 9p, I was asked to
create a qemu_strchrnul helper to factor out this functionality.
Do so, and use it in a number of other places in the code base that inlined
the replacement pattern in a place where strchrnul could be used.

Signed-off-by: Keno Fischer <keno@juliacomputing.com>
Acked-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
Keno Fischer 2018-06-29 12:32:10 +02:00 • committed by Greg Kurz
parent 609ef9f451
commit 5c99fa375d
8 changed files with 51 additions and 20 deletions
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18
configure vendored
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@ -4793,6 +4793,21 @@ if compile_prog "" "" ; then
sem_timedwait=yes
fi
##########################################
# check if we have strchrnul
strchrnul=no
cat > $TMPC << EOF
#include <string.h>
int main(void);
// Use a haystack that the compiler shouldn't be able to constant fold
char *haystack = (char*)&main;
int main(void) { return strchrnul(haystack, 'x') != &haystack[6]; }
EOF
if compile_prog "" "" ; then
strchrnul=yes
fi
##########################################
# check if trace backend exists
@ -6276,6 +6291,9 @@ fi
if test "$sem_timedwait" = "yes" ; then
echo "CONFIG_SEM_TIMEDWAIT=y" >> $config_host_mak
fi
if test "$strchrnul" = "yes" ; then
echo "HAVE_STRCHRNUL=y" >> $config_host_mak
fi
if test "$byteswap_h" = "yes" ; then
echo "CONFIG_BYTESWAP_H=y" >> $config_host_mak
fi