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regex: simplify by using intprops.h

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[BZ#23744]
* posix/regex_internal.h [_LIBC]: Include intprops.h.
(TYPE_SIGNED, INT_ADD_WRAPV) [_LIBC]: Remove.
intprops.h defines them.
This commit is contained in:
Paul Eggert 2018-10-14 22:20:08 -05:00
parent f4efbdfb44
commit 620a5d4cb1
2 changed files with 7 additions and 17 deletions
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ChangeLog
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@ -1,5 +1,11 @@
2018-10-14 Paul Eggert <eggert@cs.ucla.edu>
regex: simplify by using intprops.h
[BZ#23744]
* posix/regex_internal.h [_LIBC]: Include intprops.h.
(TYPE_SIGNED, INT_ADD_WRAPV) [_LIBC]: Remove.
intprops.h defines them.
regex: __builtin_expect → __glibc_unlikely
[BZ#23744]
This refactoring was prompted by a problem when the regex code is

18
posix/regex_internal.h
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@ -33,23 +33,7 @@
#include <stdbool.h>
#include <stdint.h>
/* Properties of integers. Although Gnulib has intprops.h, glibc does
without for now. */
#ifndef _LIBC
# include "intprops.h"
#else
/* True if the real type T is signed. */
# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
/* True if adding the nonnegative Idx values A and B would overflow.
If false, set *R to A + B. A, B, and R may be evaluated more than
once, or zero times. Although this is not a full implementation of
Gnulib INT_ADD_WRAPV, it is good enough for glibc regex code.
FIXME: This implementation is a fragile stopgap, and this file would
be simpler and more robust if intprops.h were migrated into glibc. */
# define INT_ADD_WRAPV(a, b, r) \
(IDX_MAX - (a) < (b) ? true : (*(r) = (a) + (b), false))
#endif
#include <intprops.h>
#ifdef _LIBC
# include <libc-lock.h>