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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 <stdbool.h>
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#include <sys/stat.h>
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#include <limits.h>
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static char *rval_conf_name(snd_use_case_mgr_t *uc_mgr)
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{
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if (uc_mgr->conf_file_name[0])
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return strdup(uc_mgr->conf_file_name);
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return NULL;
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}
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static char *rval_card_id(snd_use_case_mgr_t *uc_mgr)
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{
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struct ctl_list *ctl_list;
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ctl_list = uc_mgr_get_one_ctl(uc_mgr);
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if (ctl_list == NULL)
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return NULL;
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return strdup(snd_ctl_card_info_get_id(ctl_list->ctl_info));
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}
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static char *rval_card_driver(snd_use_case_mgr_t *uc_mgr)
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{
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struct ctl_list *ctl_list;
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ctl_list = uc_mgr_get_one_ctl(uc_mgr);
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if (ctl_list == NULL)
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return NULL;
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return strdup(snd_ctl_card_info_get_driver(ctl_list->ctl_info));
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}
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static char *rval_card_name(snd_use_case_mgr_t *uc_mgr)
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{
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struct ctl_list *ctl_list;
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ctl_list = uc_mgr_get_one_ctl(uc_mgr);
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if (ctl_list == NULL)
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return NULL;
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return strdup(snd_ctl_card_info_get_name(ctl_list->ctl_info));
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}
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static char *rval_card_longname(snd_use_case_mgr_t *uc_mgr)
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{
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struct ctl_list *ctl_list;
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ctl_list = uc_mgr_get_one_ctl(uc_mgr);
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if (ctl_list == NULL)
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return NULL;
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return strdup(snd_ctl_card_info_get_longname(ctl_list->ctl_info));
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}
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static char *rval_card_components(snd_use_case_mgr_t *uc_mgr)
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{
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struct ctl_list *ctl_list;
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ctl_list = uc_mgr_get_one_ctl(uc_mgr);
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if (ctl_list == NULL)
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return NULL;
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return strdup(snd_ctl_card_info_get_components(ctl_list->ctl_info));
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}
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static char *rval_env(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *id)
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{
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char *e;
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e = getenv(id);
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if (e)
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return strdup(e);
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return NULL;
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}
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static char *rval_sysfs(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED, const char *id)
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{
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char path[PATH_MAX], link[PATH_MAX + 1];
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struct stat sb;
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ssize_t len;
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char *e;
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int fd;
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e = getenv("SYSFS_PATH");
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if (e == NULL)
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e = "/sys";
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if (id[0] == '/')
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id++;
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snprintf(path, sizeof(path), "%s/%s", e, id);
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if (lstat(path, &sb) != 0)
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return NULL;
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if (S_ISLNK(sb.st_mode)) {
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len = readlink(path, link, sizeof(link) - 1);
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if (len <= 0) {
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uc_error("sysfs: cannot read link '%s' (%d)", path, errno);
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return NULL;
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}
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link[len] = '\0';
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e = strrchr(link, '/');
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if (e)
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return strdup(e + 1);
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return NULL;
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}
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if (S_ISDIR(sb.st_mode))
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return NULL;
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if ((sb.st_mode & S_IRUSR) == 0)
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return NULL;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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uc_error("sysfs open failed for '%s' (%d)", path, errno);
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return NULL;
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}
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len = read(fd, path, sizeof(path)-1);
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close(fd);
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if (len < 0) {
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uc_error("sysfs unable to read value '%s' (%d)", path, errno);
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return NULL;
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}
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while (len > 0 && path[len-1] == '\n')
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len--;
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path[len] = '\0';
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return strdup(path);
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}
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#define MATCH_VARIABLE(name, id, fcn, empty_ok) \
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if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
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rval = fcn(uc_mgr); \
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idsize = sizeof(id) - 1; \
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allow_empty = (empty_ok); \
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goto __rval; \
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}
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#define MATCH_VARIABLE2(name, id, fcn) \
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if (strncmp((name), (id), sizeof(id) - 1) == 0) { \
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idsize = sizeof(id) - 1; \
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tmp = strchr(value + idsize, '}'); \
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if (tmp) { \
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rvalsize = tmp - (value + idsize); \
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if (rvalsize > sizeof(v2)) { \
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err = -ENOMEM; \
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goto __error; \
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} \
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strncpy(v2, value + idsize, rvalsize); \
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v2[rvalsize] = '\0'; \
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idsize += rvalsize + 1; \
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rval = fcn(uc_mgr, v2); \
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goto __rval; \
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} \
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}
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int uc_mgr_get_substituted_value(snd_use_case_mgr_t *uc_mgr,
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char **_rvalue,
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const char *value)
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{
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size_t size, nsize, idsize, rvalsize, dpos = 0;
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const char *tmp;
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char *r, *nr, *rval, v2[32];
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int err;
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if (value == NULL)
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return -ENOENT;
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size = strlen(value) + 1;
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r = malloc(size);
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if (r == NULL)
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return -ENOMEM;
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while (*value) {
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if (*value == '$' && *(value+1) == '{') {
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bool allow_empty = false;
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MATCH_VARIABLE(value, "${ConfName}", rval_conf_name, false);
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MATCH_VARIABLE(value, "${CardId}", rval_card_id, false);
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MATCH_VARIABLE(value, "${CardDriver}", rval_card_driver, false);
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MATCH_VARIABLE(value, "${CardName}", rval_card_name, false);
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MATCH_VARIABLE(value, "${CardLongName}", rval_card_longname, false);
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MATCH_VARIABLE(value, "${CardComponents}", rval_card_components, true);
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MATCH_VARIABLE2(value, "${env:", rval_env);
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MATCH_VARIABLE2(value, "${sys:", rval_sysfs);
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err = -EINVAL;
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tmp = strchr(value, '}');
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Packit |
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if (tmp) {
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Packit |
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strncpy(r, value, tmp + 1 - value);
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r[tmp + 1 - value] = '\0';
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Packit |
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uc_error("variable '%s' is not known!", r);
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} else {
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Packit |
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uc_error("variable reference '%s' is not complete", value);
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}
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goto __error;
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__rval:
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|
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if (rval == NULL || (!allow_empty && rval[0] == '\0')) {
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free(rval);
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strncpy(r, value, idsize);
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r[idsize] = '\0';
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uc_error("variable '%s' is not defined in this context!", r);
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Packit |
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err = -EINVAL;
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Packit |
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goto __error;
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}
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value += idsize;
|
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rvalsize = strlen(rval);
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nsize = size + rvalsize - idsize;
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if (nsize > size) {
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Packit |
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nr = realloc(r, nsize);
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if (nr == NULL) {
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Packit |
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free(rval);
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err = -ENOMEM;
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goto __error;
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|
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}
|
|
Packit |
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size = nsize;
|
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Packit |
4a16fb |
r = nr;
|
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}
|
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strcpy(r + dpos, rval);
|
|
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dpos += rvalsize;
|
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free(rval);
|
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} else {
|
|
Packit |
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r[dpos++] = *value;
|
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value++;
|
|
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}
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|
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}
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r[dpos] = '\0';
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4a16fb |
|
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*_rvalue = r;
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return 0;
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4a16fb |
|
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__error:
|
|
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free(r);
|
|
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return err;
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|
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}
|