June 2018 Update

Task/Read-a-configuration-file/C/read-a-configuration-file.c

@@ -0,0 +1,171 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <confini.h>
+
+#define rosetta_uint8_t unsigned char
+
+#define FALSE 0
+#define TRUE 1
+
+#define CONFIGS_TO_READ 5
+#define INI_ARRAY_DELIMITER ','
+
+/* Assume that the config file represent a struct containing all the parameters to load */
+struct configs {
+	char *fullname;
+	char *favouritefruit;
+	rosetta_uint8_t needspeeling;
+	rosetta_uint8_t seedsremoved;
+	char **otherfamily;
+	size_t otherfamily_len;
+	size_t _configs_left_;
+};
+
+static char ** make_array (size_t * arrlen, const char * src, const size_t buffsize, IniFormat ini_format) {
+
+	/* Allocate a new array of strings and populate it from the stringified source */
+	*arrlen = ini_array_get_length(src, INI_ARRAY_DELIMITER, ini_format);
+	char ** const dest = *arrlen ? (char **) malloc(*arrlen * sizeof(char *) + buffsize) : NULL;
+	if (!dest) { return NULL; }
+	memcpy(dest + *arrlen, src, buffsize);
+	char * iter = (char *) (dest + *arrlen);
+	for (size_t idx = 0; idx < *arrlen; idx++) {
+		dest[idx] = ini_array_release(&iter, INI_ARRAY_DELIMITER, ini_format);
+		ini_string_parse(dest[idx], ini_format);
+	}
+	return dest;
+
+}
+
+static int configs_member_handler (IniDispatch *this, void *v_confs) {
+
+	struct configs *confs = (struct configs *) v_confs;
+
+	if (this->type != INI_KEY) {
+
+		return 0;
+
+	}
+
+	if (ini_string_match_si("FULLNAME", this->data, this->format)) {
+
+		if (confs->fullname) { return 0; }
+		this->v_len = ini_string_parse(this->value, this->format); /* Remove all quotes, if any */
+		confs->fullname = strndup(this->value, this->v_len);
+		confs->_configs_left_--;
+
+	} else if (ini_string_match_si("FAVOURITEFRUIT", this->data, this->format)) {
+
+		if (confs->favouritefruit) { return 0; }
+		this->v_len = ini_string_parse(this->value, this->format); /* Remove all quotes, if any */
+		confs->favouritefruit = strndup(this->value, this->v_len);
+		confs->_configs_left_--;
+
+	} else if (ini_string_match_si("NEEDSPEELING", this->data, this->format)) {
+
+		if (~confs->needspeeling & 0x80) { return 0; }
+		confs->needspeeling = ini_get_bool(this->value, TRUE);
+		confs->_configs_left_--;
+
+	} else if (ini_string_match_si("SEEDSREMOVED", this->data, this->format)) {
+
+		if (~confs->seedsremoved & 0x80) { return 0; }
+		confs->seedsremoved = ini_get_bool(this->value, TRUE);
+		confs->_configs_left_--;
+
+	} else if (!confs->otherfamily && ini_string_match_si("OTHERFAMILY", this->data, this->format)) {
+
+		if (confs->otherfamily) { return 0; }
+		this->v_len = ini_array_collapse(this->value, INI_ARRAY_DELIMITER, this->format); /* Save memory (not strictly needed) */
+		confs->otherfamily = make_array(&confs->otherfamily_len, this->value, this->v_len + 1, this->format);
+		confs->_configs_left_--;
+
+	}
+
+	/* Optimization: stop reading the INI file when we have all we need */
+	return !confs->_configs_left_;
+
+}
+
+static int populate_configs (struct configs * confs) {
+
+	/* Define the format of the configuration file */
+	IniFormat config_format = {
+		.delimiter_symbol = INI_ANY_SPACE,
+		.case_sensitive = FALSE,
+		.semicolon_marker = INI_IGNORE,
+		.hash_marker = INI_IGNORE,
+		.multiline_nodes = INI_NO_MULTILINE,
+		.section_paths = INI_NO_SECTIONS,
+		.no_single_quotes = FALSE,
+		.no_double_quotes = FALSE,
+		.no_spaces_in_names = TRUE,
+		.implicit_is_not_empty = TRUE,
+		.do_not_collapse_values = FALSE,
+		.preserve_empty_quotes = FALSE,
+		.no_disabled_after_space = FALSE,
+		.disabled_can_be_implicit = FALSE
+	};
+
+	*confs = (struct configs) { NULL, NULL, 0x80, 0x80, NULL, 0, CONFIGS_TO_READ };
+
+	if (load_ini_path("rosetta.conf", config_format, NULL, configs_member_handler, confs) & CONFINI_ERROR) {
+
+		fprintf(stderr, "Sorry, something went wrong :-(\n");
+		return 1;
+
+	}
+
+	confs->needspeeling &= 0x7F;
+	confs->seedsremoved &= 0x7F;
+
+	return 0;
+
+}
+
+int main () {
+
+	struct configs confs;
+
+	ini_global_set_implicit_value("YES", 0);
+
+	if (populate_configs(&confs)) {
+
+		return 1;
+
+	}
+
+	/* Print the configurations parsed */
+
+	printf(
+
+		"Full name: %s\n"
+		"Favorite fruit: %s\n"
+		"Need spelling: %s\n"
+		"Seeds removed: %s\n",
+
+		confs.fullname,
+		confs.favouritefruit,
+		confs.needspeeling ? "True" : "False",
+		confs.seedsremoved ? "True" : "False"
+
+	);
+
+	for (size_t idx = 0; idx < confs.otherfamily_len; idx++) {
+
+		printf("Other family[%d]: %s\n", idx, confs.otherfamily[idx]);
+
+	}
+
+	/* Free the allocated memory */
+
+	#define FREE_NON_NULL(PTR) if (PTR) { free(PTR); }
+
+	FREE_NON_NULL(confs.fullname);
+	FREE_NON_NULL(confs.favouritefruit);
+	FREE_NON_NULL(confs.otherfamily);
+
+	return 0;
+
+}