diff options
Diffstat (limited to 'shared/config-parser.c')
| -rw-r--r-- | shared/config-parser.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/shared/config-parser.c b/shared/config-parser.c new file mode 100644 index 00000000..8defbbb4 --- /dev/null +++ b/shared/config-parser.c @@ -0,0 +1,434 @@ +/* + * Copyright © 2011 Intel Corporation + * + * Permission to use, copy, modify, distribute, and sell this software and its + * documentation for any purpose is hereby granted without fee, provided that + * the above copyright notice appear in all copies and that both that copyright + * notice and this permission notice appear in supporting documentation, and + * that the name of the copyright holders not be used in advertising or + * publicity pertaining to distribution of the software without specific, + * written prior permission. The copyright holders make no representations + * about the suitability of this software for any purpose. It is provided "as + * is" without express or implied warranty. + * + * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO + * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, + * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER + * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +#include "config.h" + +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <assert.h> +#include <ctype.h> +#include <limits.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> + +#include <wayland-util.h> +#include "config-parser.h" + +#define container_of(ptr, type, member) ({ \ + const __typeof__( ((type *)0)->member ) *__mptr = (ptr); \ + (type *)( (char *)__mptr - offsetof(type,member) );}) + +struct weston_config_entry { + char *key; + char *value; + struct wl_list link; +}; + +struct weston_config_section { + char *name; + struct wl_list entry_list; + struct wl_list link; +}; + +struct weston_config { + struct wl_list section_list; + char path[PATH_MAX]; +}; + +static int +open_config_file(struct weston_config *c, const char *name) +{ + const char *config_dir = getenv("XDG_CONFIG_HOME"); + const char *home_dir = getenv("HOME"); + const char *config_dirs = getenv("XDG_CONFIG_DIRS"); + const char *p, *next; + int fd; + + if (name[0] == '/') { + snprintf(c->path, sizeof c->path, "%s", name); + return open(name, O_RDONLY | O_CLOEXEC); + } + + /* Precedence is given to config files in the home directory, + * and then to directories listed in XDG_CONFIG_DIRS and + * finally to the current working directory. */ + + /* $XDG_CONFIG_HOME */ + if (config_dir) { + snprintf(c->path, sizeof c->path, "%s/%s", config_dir, name); + fd = open(c->path, O_RDONLY | O_CLOEXEC); + if (fd >= 0) + return fd; + } + + /* $HOME/.config */ + if (home_dir) { + snprintf(c->path, sizeof c->path, + "%s/.config/%s", home_dir, name); + fd = open(c->path, O_RDONLY | O_CLOEXEC); + if (fd >= 0) + return fd; + } + + /* For each $XDG_CONFIG_DIRS: weston/<config_file> */ + if (!config_dirs) + config_dirs = "/etc/xdg"; /* See XDG base dir spec. */ + + for (p = config_dirs; *p != '\0'; p = next) { + next = strchrnul(p, ':'); + snprintf(c->path, sizeof c->path, + "%.*s/weston/%s", (int)(next - p), p, name); + fd = open(c->path, O_RDONLY | O_CLOEXEC); + if (fd >= 0) + return fd; + + if (*next == ':') + next++; + } + + /* Current working directory. */ + snprintf(c->path, sizeof c->path, "./%s", name); + + return open(c->path, O_RDONLY | O_CLOEXEC); +} + +static struct weston_config_entry * +config_section_get_entry(struct weston_config_section *section, + const char *key) +{ + struct weston_config_entry *e; + + if (section == NULL) + return NULL; + wl_list_for_each(e, §ion->entry_list, link) + if (strcmp(e->key, key) == 0) + return e; + + return NULL; +} + +WL_EXPORT +struct weston_config_section * +weston_config_get_section(struct weston_config *config, const char *section, + const char *key, const char *value) +{ + struct weston_config_section *s; + struct weston_config_entry *e; + + if (config == NULL) + return NULL; + wl_list_for_each(s, &config->section_list, link) { + if (strcmp(s->name, section) != 0) + continue; + if (key == NULL) + return s; + e = config_section_get_entry(s, key); + if (e && strcmp(e->value, value) == 0) + return s; + } + + return NULL; +} + +WL_EXPORT +int +weston_config_section_get_int(struct weston_config_section *section, + const char *key, + int32_t *value, int32_t default_value) +{ + struct weston_config_entry *entry; + char *end; + + entry = config_section_get_entry(section, key); + if (entry == NULL) { + *value = default_value; + errno = ENOENT; + return -1; + } + + *value = strtol(entry->value, &end, 0); + if (*end != '\0') { + *value = default_value; + errno = EINVAL; + return -1; + } + + return 0; +} + +WL_EXPORT +int +weston_config_section_get_uint(struct weston_config_section *section, + const char *key, + uint32_t *value, uint32_t default_value) +{ + struct weston_config_entry *entry; + char *end; + + entry = config_section_get_entry(section, key); + if (entry == NULL) { + *value = default_value; + errno = ENOENT; + return -1; + } + + *value = strtoul(entry->value, &end, 0); + if (*end != '\0') { + *value = default_value; + errno = EINVAL; + return -1; + } + + return 0; +} + +WL_EXPORT +int +weston_config_section_get_double(struct weston_config_section *section, + const char *key, + double *value, double default_value) +{ + struct weston_config_entry *entry; + char *end; + + entry = config_section_get_entry(section, key); + if (entry == NULL) { + *value = default_value; + errno = ENOENT; + return -1; + } + + *value = strtod(entry->value, &end); + if (*end != '\0') { + *value = default_value; + errno = EINVAL; + return -1; + } + + return 0; +} + +WL_EXPORT +int +weston_config_section_get_string(struct weston_config_section *section, + const char *key, + char **value, const char *default_value) +{ + struct weston_config_entry *entry; + + entry = config_section_get_entry(section, key); + if (entry == NULL) { + if (default_value) + *value = strdup(default_value); + else + *value = NULL; + errno = ENOENT; + return -1; + } + + *value = strdup(entry->value); + + return 0; +} + +WL_EXPORT +int +weston_config_section_get_bool(struct weston_config_section *section, + const char *key, + int *value, int default_value) +{ + struct weston_config_entry *entry; + + entry = config_section_get_entry(section, key); + if (entry == NULL) { + *value = default_value; + errno = ENOENT; + return -1; + } + + if (strcmp(entry->value, "false") == 0) + *value = 0; + else if (strcmp(entry->value, "true") == 0) + *value = 1; + else { + *value = default_value; + errno = EINVAL; + return -1; + } + + return 0; +} + +static struct weston_config_section * +config_add_section(struct weston_config *config, const char *name) +{ + struct weston_config_section *section; + + section = malloc(sizeof *section); + section->name = strdup(name); + wl_list_init(§ion->entry_list); + wl_list_insert(config->section_list.prev, §ion->link); + + return section; +} + +static struct weston_config_entry * +section_add_entry(struct weston_config_section *section, + const char *key, const char *value) +{ + struct weston_config_entry *entry; + + entry = malloc(sizeof *entry); + entry->key = strdup(key); + entry->value = strdup(value); + wl_list_insert(section->entry_list.prev, &entry->link); + + return entry; +} + +struct weston_config * +weston_config_parse(const char *name) +{ + FILE *fp; + char line[512], *p; + struct weston_config *config; + struct weston_config_section *section = NULL; + int i, fd; + + config = malloc(sizeof *config); + if (config == NULL) + return NULL; + + wl_list_init(&config->section_list); + + fd = open_config_file(config, name); + if (fd == -1) { + free(config); + return NULL; + } + + fp = fdopen(fd, "r"); + if (fp == NULL) { + free(config); + return NULL; + } + + while (fgets(line, sizeof line, fp)) { + switch (line[0]) { + case '#': + case '\n': + continue; + case '[': + p = strchr(&line[1], ']'); + if (!p || p[1] != '\n') { + fprintf(stderr, "malformed " + "section header: %s\n", line); + fclose(fp); + weston_config_destroy(config); + return NULL; + } + p[0] = '\0'; + section = config_add_section(config, &line[1]); + continue; + default: + p = strchr(line, '='); + if (!p || p == line || !section) { + fprintf(stderr, "malformed " + "config line: %s\n", line); + fclose(fp); + weston_config_destroy(config); + return NULL; + } + + p[0] = '\0'; + p++; + while (isspace(*p)) + p++; + i = strlen(p); + while (i > 0 && isspace(p[i - 1])) { + p[i - 1] = '\0'; + i--; + } + section_add_entry(section, line, p); + continue; + } + } + + fclose(fp); + + return config; +} + +const char * +weston_config_get_full_path(struct weston_config *config) +{ + return config == NULL ? NULL : config->path; +} + +int +weston_config_next_section(struct weston_config *config, + struct weston_config_section **section, + const char **name) +{ + if (config == NULL) + return 0; + + if (*section == NULL) + *section = container_of(config->section_list.next, + struct weston_config_section, link); + else + *section = container_of((*section)->link.next, + struct weston_config_section, link); + + if (&(*section)->link == &config->section_list) + return 0; + + *name = (*section)->name; + + return 1; +} + +void +weston_config_destroy(struct weston_config *config) +{ + struct weston_config_section *s, *next_s; + struct weston_config_entry *e, *next_e; + + if (config == NULL) + return; + + wl_list_for_each_safe(s, next_s, &config->section_list, link) { + wl_list_for_each_safe(e, next_e, &s->entry_list, link) { + free(e->key); + free(e->value); + free(e); + } + free(s->name); + free(s); + } + + free(config); +} |