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135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* Helper functions to handle tunable strings.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _DL_TUNABLES_PARSE_H
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#define _DL_TUNABLES_PARSE_H 1
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#include <assert.h>
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#include <string.h>
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/* Compare the contents of STRVAL with STR of size LEN. The STR might not
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be null-terminated. */
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static __always_inline bool
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tunable_strcmp (const struct tunable_str_t *strval, const char *str,
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size_t len)
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{
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return strval->len == len && memcmp (strval->str, str, len) == 0;
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}
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#define tunable_strcmp_cte(__tunable, __str) \
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tunable_strcmp (&__tunable->strval, __str, sizeof (__str) - 1)
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/*
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Helper functions to iterate over a tunable string composed by multiple
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suboptions separated by commaxi; this is a common pattern for CPU. Each
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suboptions is return in the form of { address, size } (no null terminated).
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For instance:
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struct tunable_str_comma_t ts;
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tunable_str_comma_init (&ts, valp);
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struct tunable_str_t t;
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while (tunable_str_comma_next (&ts, &t))
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{
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_dl_printf ("[%s] %.*s (%d)\n",
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__func__,
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(int) tstr.len,
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tstr.str,
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(int) tstr.len);
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if (tunable_str_comma_strcmp (&t, opt, opt1_len))
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{
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[...]
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}
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else if (tunable_str_comma_strcmp_cte (&t, "opt2"))
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{
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[...]
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}
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}
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NB: These function are expected to be called from tunable callback
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functions along with tunable_val_t with string types.
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*/
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struct tunable_str_comma_state_t
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{
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const char *p;
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size_t plen;
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size_t maxplen;
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};
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struct tunable_str_comma_t
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{
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const char *str;
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size_t len;
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bool disable;
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};
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static inline void
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tunable_str_comma_init (struct tunable_str_comma_state_t *state,
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tunable_val_t *valp)
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{
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assert (valp->strval.str != NULL);
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state->p = valp->strval.str;
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state->plen = 0;
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state->maxplen = valp->strval.len;
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}
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static inline bool
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tunable_str_comma_next (struct tunable_str_comma_state_t *state,
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struct tunable_str_comma_t *str)
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{
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if (*state->p == '\0' || state->plen >= state->maxplen)
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return false;
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const char *c;
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for (c = state->p; *c != ','; c++, state->plen++)
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if (*c == '\0' || state->plen == state->maxplen)
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break;
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str->str = state->p;
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str->len = c - state->p;
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if (str->len > 0)
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{
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str->disable = *str->str == '-';
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if (str->disable)
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{
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str->str = str->str + 1;
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str->len = str->len - 1;
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}
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}
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state->p = c + 1;
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state->plen++;
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return true;
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}
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/* Compare the contents of T with STR of size LEN. The STR might not be
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null-terminated. */
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static __always_inline bool
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tunable_str_comma_strcmp (const struct tunable_str_comma_t *t, const char *str,
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size_t len)
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{
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return t->len == len && memcmp (t->str, str, len) == 0;
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}
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#define tunable_str_comma_strcmp_cte(__t, __str) \
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tunable_str_comma_strcmp (__t, __str, sizeof (__str) - 1)
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#endif
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