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/* Helper functions to handle tunable strings.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _DL_TUNABLES_PARSE_H
#define _DL_TUNABLES_PARSE_H 1
#ifndef DEFAULT_MEMCMP
# define DEFAULT_MEMCMP memcmp
#endif
/* Compare the contents of STRVAL with STR of size LEN. The STR might not
be null-terminated. */
static inline bool
tunable_strcmp (const struct tunable_str_t *strval, const char *str,
size_t len)
{
return strval->len == len && DEFAULT_MEMCMP (strval->str, str, len) == 0;
}
#define tunable_strcmp_cte(__tunable, __str) \
({ \
__builtin_constant_p (__str) \
? tunable_strcmp (&__tunable->strval, __str, sizeof (__str) - 1) \
: tunable_strcmp (&__tunable->strval, __str, strlen (__str)); \
})
/* Helper function to iterate over string tunable composed by multiple
suboptions separated by comma. The tunable is represented as span (address
and size) from GLIBC_TUNABLES, so it might not be null terminated.
For instance, to print all the items:
struct tunable_str_comma_t st;
tunable_str_comma_init (&st, valp);
struct tunable_str_t tstr;
while (tunable_str_comma_next (&st, &tstr))
{
if (tstr.len == 0)
continue;
_dl_printf ("[%s] %.*s (%d)\n", __func__,
(int) tstr.len,
tstr.str,
(int) tstr.len);
} */
struct tunable_str_comma_t
{
const char *p;
size_t plen;
size_t maxplen;
};
static inline void
tunable_str_comma_init (struct tunable_str_comma_t *state, tunable_val_t *valp)
{
state->p = valp->strval.str;
state->plen = 0;
state->maxplen = valp->strval.len;
}
static inline bool
tunable_str_comma_next (struct tunable_str_comma_t *state,
struct tunable_str_t *str)
{
if (*state->p == '\0' || state->plen >= state->maxplen)
return false;
const char *c;
for (c = state->p; *c != ','; c++, state->plen++)
if (*c == '\0' || state->plen == state->maxplen)
break;
str->str = state->p;
str->len = c - state->p;
state->p = c + 1;
state->plen++;
return true;
}
#endif
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