1 files changed, 147 insertions, 0 deletions
diff --git a/src/config-ini.c b/src/config-ini.c
new file mode 100644
index 0000000..7cfa1ff
--- /dev/null
+++ b/src/config-ini.c
@@ -0,0 +1,147 @@
+#include "config-ini.h"
+#include "types.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void free_field(ini_field_t *field) {
+	free(field->key);
+	free(field->value);
+	free(field);
+}
+
+static void free_section(ini_section_t *section) {
+	ini_field_t *field, *tmp;
+
+	list_for_each_entry_safe(field, tmp, &section->fields, node)
+		free_field(field);
+
+	free(section->name);
+	free(section);
+}
+
+void free_ini_file(ini_file_t *file) {
+	ini_section_t *section, *tmp;
+
+	list_for_each_entry_safe(section, tmp, &file->sections, node)
+		free_section(section);
+
+	free(file);
+}
+
+static bool add_field(ini_section_t *section, const char *key, const char *value) {
+	ini_field_t *field = calloc(1, sizeof(*field));
+	if (!field)
+		return false;
+
+	field->key = strdup(key);
+	field->value = strdup(value);
+
+	if (!field->key || !field->value) {
+		free_field(field);
+		return false;
+	}
+
+	list_add_tail(&field->node, &section->fields);
+
+	return true;
+}
+
+static ini_section_t * add_section(ini_file_t *file, const char *name) {
+	ini_section_t *section = calloc(1, sizeof(*section));
+	if (!section)
+		return NULL;
+	
+	section->name = strdup(name);
+	if (!section->name) {
+		free(section);
+		return false;
+	}
+
+	INIT_LIST_HEAD(&section->fields);
+	list_add_tail(&section->node, &file->sections);
+
+	return section;
+}
+
+ini_file_t * read_ini_file(const char *filename) {
+	FILE *f = fopen(filename, "r");
+	if (!f)
+		return NULL;
+	
+	ini_file_t *file = calloc(1, sizeof(*file));
+	if (!file)
+		goto error;
+
+	INIT_LIST_HEAD(&file->sections);
+
+	ini_section_t *section = NULL;
+	int err = 0;
+
+	char *line = NULL;
+	size_t n = 0;
+
+	while (getline(&line, &n, f) >= 0) {
+		char *input = line;
+
+		while (isspace(input[0]))
+			input++;
+		
+		if (input[0] == '#' || input[0] == '\0')
+			continue;
+
+		size_t len = strlen(input);
+
+		while (isspace(input[len-1]))
+			len--;
+
+		if (input[0] == '[') {
+			if (input[len-1] != ']') {
+				err = EINVAL;
+				goto error;
+			}
+
+			input[len-1] = '\0';
+
+			section = add_section(file, input+1);
+			if (!section)
+				goto error;
+		} else {
+			if (!section) {
+				err = EINVAL;
+				goto error;
+			}
+
+			input[len] = '\0';
+
+			char *delim = strchr(input, '=');
+			if (!delim) {
+				err = EINVAL;
+				goto error;
+			}
+			
+			*delim = '\0';
+
+			if (!add_field(section, input, delim+1))
+				goto error;
+		}
+	}
+
+	if (ferror(f))
+		err = EIO;
+
+error:
+	free(line);
+	fclose(f);
+
+	if (err) {
+		free_ini_file(file);
+		errno = err;
+		return NULL;
+	}
+
+	return file;
+}