move config parser to a convenience library

Create a new directory for convenience librariers that can be shared
between compositor components and clients.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

3 files changed, 229 insertions, 0 deletions

diff --git a/shared/Makefile.am b/shared/Makefile.am
new file mode 100644
index 0000000..a964a04
--- /dev/null
+++ b/shared/Makefile.am
@@ -0,0 +1,3 @@
+noinst_LTLIBRARIES = libconfigparser.la
+libconfigparser_la_SOURCES = configparser.c \
+	configparser.h
diff --git a/shared/configparser.c b/shared/configparser.c
new file mode 100644
index 0000000..c48fe4c
--- /dev/null
+++ b/shared/configparser.c
@@ -0,0 +1,172 @@
+/*
+ * 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 <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "configparser.h"
+
+static int
+handle_key(const struct config_key *key, const char *value)
+{
+	char *end, *s;
+	int i, len;
+	
+	switch (key->type) {
+	case CONFIG_KEY_INTEGER:
+		i = strtol(value, &end, 0);
+		if (*end != '\n') {
+			fprintf(stderr, "invalid integer: %s\n", value);
+			return -1;
+		}
+		*(int *)key->data = i;
+		return 0;
+
+	case CONFIG_KEY_STRING:
+		len = strlen(value);
+		s = malloc(len);
+		if (s == NULL)
+			return -1;
+		memcpy(s, value, len - 1);
+		s[len - 1] = '\0';
+		*(char **)key->data = s;
+		return 0;
+
+	case CONFIG_KEY_BOOL:
+		if (strcmp(value, "false\n") == 0)
+			*(int *)key->data = 0;
+		else if (strcmp(value, "true\n") == 0)
+			*(int *)key->data = 1;
+		else {
+			fprintf(stderr, "invalid bool: %s\n", value);
+			return -1;
+		}
+		return 0;
+
+	default:
+		assert(0);
+		break;
+	}
+}
+
+int
+parse_config_file(const char *path,
+		  const struct config_section *sections, int num_sections,
+		  void *data)
+{
+	FILE *fp;
+	char line[512], *p;
+	const struct config_section *current = NULL;
+	int i;
+
+	fp = fopen(path, "r");
+	if (fp == NULL) {
+		fprintf(stderr, "couldn't open %s\n", path);
+		return -1;
+	}
+
+	while (fgets(line, sizeof line, fp)) {
+		if (line[0] == '#' || line[0] == '\n') {
+			continue;
+		} if (line[0] == '[') {
+			p = strchr(&line[1], ']');
+			if (!p || p[1] != '\n') {
+				fprintf(stderr, "malformed "
+					"section header: %s\n", line);
+				fclose(fp);
+				return -1;
+			}
+			if (current && current->done)
+				current->done(data);
+			p[0] = '\0';
+			for (i = 0; i < num_sections; i++) {
+				if (strcmp(sections[i].name, &line[1]) == 0) {
+					current = &sections[i];
+					break;
+				}
+			}
+			if (i == num_sections)
+				current = NULL;
+		} else if (p = strchr(line, '='), p != NULL) {
+			if (current == NULL)
+				continue;
+			p[0] = '\0';
+			for (i = 0; i < current->num_keys; i++) {
+				if (strcmp(current->keys[i].name, line) == 0) {
+					if (handle_key(&current->keys[i], &p[1]) < 0) {
+						fclose(fp);
+						return -1;
+					}
+					break;
+				}
+			}
+		} else {
+			fprintf(stderr, "malformed config line: %s\n", line);
+			fclose(fp);
+			return -1;
+		}
+	}
+
+	if (current && current->done)
+		current->done(data);
+
+	fclose(fp);
+
+	return 0;
+}
+
+char *
+config_file_path(const char *name)
+{
+	const char dotconf[] = "/.config/";
+	const char *config_dir;
+	const char *home_dir;
+	char *path;
+	size_t size;
+
+	config_dir = getenv("XDG_CONFIG_HOME");
+	if (!config_dir) {
+		home_dir = getenv("HOME");
+		if (!home_dir) {
+			fprintf(stderr, "HOME is not set, using cwd.\n");
+			return strdup(name);
+		}
+
+		size = strlen(home_dir) + sizeof dotconf + strlen(name);
+		path = malloc(size);
+		if (!path)
+			return NULL;
+
+		snprintf(path, size, "%s%s%s", home_dir, dotconf, name);
+		return path;
+	}
+
+	size = strlen(config_dir) + 1 + strlen(name) + 1;
+	path = malloc(size);
+	if (!path)
+		return NULL;
+
+	snprintf(path, size, "%s/%s", config_dir, name);
+	return path;
+}
diff --git a/shared/configparser.h b/shared/configparser.h
new file mode 100644
index 0000000..93b335c
--- /dev/null
+++ b/shared/configparser.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright © 2008 Kristian Høgsberg
+ *
+ * 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.
+ */
+
+#ifndef CONFIGPARSER_H
+#define CONFIGPARSER_H
+
+enum {
+	CONFIG_KEY_INTEGER,
+	CONFIG_KEY_STRING,
+	CONFIG_KEY_BOOL
+};
+
+struct config_key {
+	const char *name;
+	int type;
+	void *data;
+};
+
+struct config_section {
+	const char *name;
+	const struct config_key *keys;
+	int num_keys;
+	void (*done)(void *data);
+};
+
+int
+parse_config_file(const char *path,
+		  const struct config_section *sections, int num_sections,
+		  void *data);
+
+char *
+config_file_path(const char *name);
+
+#endif /* CONFIGPARSER_H */
+