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/*
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* This 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 of the License, or (at your option) any later version.
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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Support for the verb/device/modifier core logic and API,
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* command line tool and file parser was kindly sponsored by
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* Texas Instruments Inc.
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* Support for multiple active modifiers and devices,
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* transition sequences, multiple client access and user defined use
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* cases was kindly sponsored by Wolfson Microelectronics PLC.
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*
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* Copyright (C) 2019 Red Hat Inc.
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* Authors: Jaroslav Kysela <perex@perex.cz>
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*/
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#include "ucm_local.h"
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#include <ctype.h>
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#include <regex.h>
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static int get_string(snd_config_t *compound, const char *key, const char **str)
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{
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snd_config_t *node;
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int err;
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err = snd_config_search(compound, key, &node);
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if (err < 0)
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return err;
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return snd_config_get_string(node, str);
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}
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static char *extract_substring(const char *data, regmatch_t *match)
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{
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char *s;
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size_t len;
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len = match->rm_eo - match->rm_so;
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s = malloc(len + 1);
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if (s == NULL)
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return NULL;
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memcpy(s, data + match->rm_so, len);
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s[len] = '\0';
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return s;
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}
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static int set_variables(snd_use_case_mgr_t *uc_mgr, const char *data,
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unsigned int match_size, regmatch_t *match,
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const char *name)
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{
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size_t name2_len = strlen(name) + 16;
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char *name2 = alloca(name2_len);
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char *s;
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unsigned int i;
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int err;
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if (match[0].rm_so < 0 || match[0].rm_eo < 0)
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return 0;
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s = extract_substring(data, &match[0]);
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if (s == NULL)
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return -ENOMEM;
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err = uc_mgr_set_variable(uc_mgr, name, s);
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free(s);
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if (err < 0)
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return err;
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for (i = 1; i < match_size; i++) {
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if (match[0].rm_so < 0 || match[0].rm_eo < 0)
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return 0;
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s = extract_substring(data, &match[i]);
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if (s == NULL)
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return -ENOMEM;
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snprintf(name2, name2_len, "%s%u", name, i);
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err = uc_mgr_set_variable(uc_mgr, name2, s);
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free(s);
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if (err < 0)
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return err;
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}
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return 0;
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}
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int uc_mgr_define_regex(snd_use_case_mgr_t *uc_mgr, const char *name,
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snd_config_t *eval)
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{
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const char *string, *regex_string, *flags_string;
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char *s;
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regex_t re;
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int options = 0;
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regmatch_t match[20];
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int err;
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if (uc_mgr->conf_format < 3) {
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uc_error("define regex is supported in v3+ syntax");
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return -EINVAL;
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}
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if (snd_config_get_type(eval) != SND_CONFIG_TYPE_COMPOUND) {
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uc_error("compound type expected for DefineRegex");
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return -EINVAL;
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}
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err = get_string(eval, "String", &string);
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if (err < 0) {
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uc_error("DefineRegex error (String)");
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return -EINVAL;
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}
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err = get_string(eval, "Regex", ®ex_string);
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if (err < 0) {
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uc_error("DefineRegex error (Regex string)");
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return -EINVAL;
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}
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err = get_string(eval, "Flags", &flags_string);
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if (err == -ENOENT) {
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options = REG_EXTENDED;
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} else if (err < 0) {
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uc_error("DefineRegex error (Flags string)");
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return -EINVAL;
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} else {
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while (*flags_string) {
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switch (tolower(*flags_string)) {
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case 'e':
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options |= REG_EXTENDED;
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break;
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case 'i':
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options |= REG_ICASE;
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break;
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case 's':
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options |= REG_NOSUB;
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break;
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case 'n':
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options |= REG_NEWLINE;
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break;
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default:
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uc_error("DefineRegex error (unknown flag '%c')", *flags_string);
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return -EINVAL;
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}
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flags_string++;
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}
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}
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err = uc_mgr_get_substituted_value(uc_mgr, &s, regex_string);
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if (err < 0)
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return err;
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err = regcomp(&re, s, options);
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free(s);
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if (err) {
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uc_error("Regex '%s' compilation failed (code %d)", err);
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return -EINVAL;
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}
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err = uc_mgr_get_substituted_value(uc_mgr, &s, string);
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if (err < 0) {
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regfree(&re);
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return err;
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}
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err = regexec(&re, s, ARRAY_SIZE(match), match, 0);
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if (err < 0)
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err = -errno;
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else
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err = set_variables(uc_mgr, s, ARRAY_SIZE(match), match, name);
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free(s);
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regfree(&re);
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return err;
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}
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