Mercurial > hg > octave-kai > gnulib-hg
diff lib/regex_internal.h @ 6125:4af02335816a
* config/srclist.txt: Add glibc bug 1245.
* lib/regexec.c (set_regs): Don't alloca with an unbounded size.
alloca modernization/simplification for regex.
* lib/regex.c: Remove portability cruft for alloca. This no longer
needs to be at the start of the file, and can be moved into
regex_internal.h and simplified.
* lib/regex_internal.h: Include <alloca.h>.
(__libc_use_alloca) [!defined _LIBC]: New macro.
* lib/regexec.c (build_trtable): Remove "#ifdef _LIBC",
since the code now works outside glibc.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 26 Aug 2005 05:58:54 +0000 (2005-08-26) |
| parents | c3bf2ea44695 |
| children | 3690c96b6da9 |
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--- a/lib/regex_internal.h +++ b/lib/regex_internal.h @@ -431,6 +431,21 @@ #define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx)) #define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx)) +#include <alloca.h> + +#ifndef __LIBC +# if HAVE_ALLOCA +/* The OS usually guarantees only one guard page at the bottom of the stack, + and a page size can be as small as 4096 bytes. So we cannot safely + allocate anything larger than 4096 bytes. Also care for the possibility + of a few compiler-allocated temporary stack slots. */ +# define __libc_use_alloca(n) ((n) < 4032) +# else +/* alloca is implemented with malloc, so just use malloc. */ +# define __libc_use_alloca(n) 0 +# endif +#endif + #define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t))) #define re_calloc(t,n) ((t *) calloc (n, sizeof (t))) #define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))