From 2b92b8685727d708793756158493beb30719c875 Mon Sep 17 00:00:00 2001 From: Jon Lund Steffensen Date: Fri, 15 Oct 2010 12:43:48 +0200 Subject: Add configuration file support. --- src/config-ini.c | 235 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 235 insertions(+) create mode 100644 src/config-ini.c (limited to 'src/config-ini.c') diff --git a/src/config-ini.c b/src/config-ini.c new file mode 100644 index 0000000..01ba99c --- /dev/null +++ b/src/config-ini.c @@ -0,0 +1,235 @@ +/* config-ini.c -- INI config file parser + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see . + + Copyright (c) 2010 Jon Lund Steffensen +*/ + + +#include +#include +#include +#include + +#include "config-ini.h" + +#ifdef ENABLE_NLS +# include +# define _(s) gettext(s) +#else +# define _(s) s +#endif + +#define MAX_CONFIG_PATH 4096 +#define MAX_LINE_LENGTH 512 + + +static FILE * +open_config_file(const char *filepath) +{ + if (filepath == NULL) { + char cp[MAX_CONFIG_PATH]; + char *env; + + if ((env = getenv("XDG_CONFIG_HOME")) != NULL && + env[0] != '\0') { + snprintf(cp, sizeof(cp), "%s/redshift.conf", env); + filepath = cp; + } else if ((env = getenv("HOME")) != NULL && env[0] != '\0') { + snprintf(cp, sizeof(cp), + "%s/.config/redshift.conf", env); + filepath = cp; + } + + if (filepath != NULL) { + FILE *f = fopen(filepath, "r"); + if (f != NULL) return f; + else if (f == NULL && errno != ENOENT) return NULL; + } + + /* TODO look in getenv("XDG_CONFIG_DIRS") */ + } else { + FILE *f = fopen(filepath, "r"); + if (f == NULL) { + perror("fopen"); + return NULL; + } + } + + return NULL; +} + +int +config_ini_init(config_ini_state_t *state, const char *filepath) +{ + config_ini_section_t *section = NULL; + state->sections = NULL; + + FILE *f = open_config_file(filepath); + if (f == NULL) { + /* Only a serious error if a file was explicitly requested. */ + if (filepath != NULL) return -1; + return 0; + } + + char line[MAX_LINE_LENGTH]; + char *s; + + while (1) { + /* Handle the file input linewise. */ + char *r = fgets(line, sizeof(line), f); + if (r == NULL) break; + + /* Strip leading blanks and trailing newline. */ + s = line + strspn(line, " \t"); + s[strcspn(s, "\r\n")] = '\0'; + + /* Skip comments and empty lines. */ + if (s[0] == ';' || s[0] == '\0') continue; + + if (s[0] == '[') { + /* Read name of section. */ + const char *name = s+1; + char *end = strchr(s, ']'); + if (end == NULL || end[1] != '\0' || end == name) { + fputs(_("Malformed section header in config" + " file.\n"), stderr); + fclose(f); + config_ini_free(state); + return -1; + } + + *end = '\0'; + + /* Create section. */ + section = malloc(sizeof(config_ini_section_t)); + if (section == NULL) { + fclose(f); + config_ini_free(state); + return -1; + } + + /* Insert into section list. */ + section->name = NULL; + section->settings = NULL; + section->next = state->sections; + state->sections = section; + + /* Copy section name. */ + section->name = malloc(end - name + 1); + if (section->name == NULL) { + fclose(f); + config_ini_free(state); + return -1; + } + + memcpy(section->name, name, end - name + 1); + } else { + /* Split assignment at equals character. */ + char *end = strchr(s, '='); + if (end == NULL || end == s) { + fputs(_("Malformed assignment in config" + " file.\n"), stderr); + fclose(f); + config_ini_free(state); + return -1; + } + + *end = '\0'; + char *value = end + 1; + + if (section == NULL) { + fputs(_("Assignment outside section in config" + " file.\n"), stderr); + fclose(f); + config_ini_free(state); + return -1; + } + + /* Create section. */ + config_ini_setting_t *setting = + malloc(sizeof(config_ini_setting_t)); + if (setting == NULL) { + fclose(f); + config_ini_free(state); + return -1; + } + + /* Insert into section list. */ + setting->name = NULL; + setting->value = NULL; + setting->next = section->settings; + section->settings = setting; + + /* Copy name of setting. */ + setting->name = malloc(end - s + 1); + if (setting->name == NULL) { + fclose(f); + config_ini_free(state); + return -1; + } + + memcpy(setting->name, s, end - s + 1); + + /* Copy setting value. */ + size_t value_len = strlen(value) + 1; + setting->value = malloc(value_len); + if (setting->value == NULL) { + fclose(f); + config_ini_free(state); + return -1; + } + + memcpy(setting->value, value, value_len); + } + } + + fclose(f); + + return 0; +} + +void +config_ini_free(config_ini_state_t *state) +{ + config_ini_section_t *section = state->sections; + + while (section != NULL) { + config_ini_setting_t *setting = section->settings; + + while (setting != NULL) { + free(setting->name); + free(setting->value); + setting = setting->next; + } + + free(section->name); + section = section->next; + } +} + +config_ini_section_t * +config_ini_get_section(config_ini_state_t *state, const char *name) +{ + config_ini_section_t *section = state->sections; + while (section != NULL) { + if (strcasecmp(section->name, name) == 0) { + return section; + } + section = section->next; + } + + return NULL; +} -- cgit v1.2.3-70-g09d2