X-Git-Url: http://git.itanic.dy.fi/?p=log-plotter;a=blobdiff_plain;f=config.c;fp=config.c;h=54f672e287d43ed74228fe62d1df251b755687b3;hp=0000000000000000000000000000000000000000;hb=84ab13170c021724847f80663c9136ec8badac57;hpb=d44a215cef8d81a7dbb0f52168f5cca2cfc31aed

diff --git a/config.c b/config.c
new file mode 100644
index 0000000..54f672e
--- /dev/null
+++ b/config.c
@@ -0,0 +1,135 @@
+#include <stdio.h>
+#include <glob.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "config.h"
+#include "trace.h"
+
+static int parse_config_line(char *line, char **variable, char **value)
+{
+#define SKIP_UNTIL(_str, _cond)		\
+	while (*_str && (_cond))	\
+		_str++;
+
+	SKIP_UNTIL(line, isspace(*line));
+
+	/* Skip comments */
+	if (*line == '#')
+		return -1;
+
+	/* The actual variable name begins here */
+	*variable = line;
+
+	/* Find where the variable name ends */
+	SKIP_UNTIL(line, !isspace(*line) && *line != '=');
+
+	if (*line == '=') {
+		*line = '\0';
+		line++;
+		goto value_start;
+	}
+
+	/* If we encounter line end already, the line can't be valid */
+	if (!*line)
+		return -1;
+
+	/* Terminate the variable name */
+	*line = '\0';
+	line++;
+	 
+	/* Find the equal sign */
+	SKIP_UNTIL(line, *line != '=');
+
+	if (*line != '=')
+		return -1;
+	line++;
+
+	SKIP_UNTIL(line, isspace(*line));
+
+value_start:
+	*value = line;
+
+	SKIP_UNTIL(line, *line != '\n' && *line != '#');
+	*line = 0;
+
+	return 0;
+}
+
+static int store_variable_value_to_plotter_config(const char *variable,
+						const char *value,
+						struct plotter_config *cfg)
+{
+#define TEST_STR_STORE_STR_RETURN(_cfg, _variable, _str, _value)	\
+	if (!strcmp(_variable, #_str) && !cfg->_str) {			\
+		cfg->_str = strdup(_value);				\
+		return 0;						\
+	}
+
+#define TEST_STR_STORE_INT_RETURN(_cfg, _variable, _str, _value)	\
+	if (!strcmp(_variable, #_str)) {				\
+		cfg->_str = atoi(_value);				\
+		return 0;						\
+	}
+
+	TEST_STR_STORE_STR_RETURN(cfg, variable, charger_name, value);
+	TEST_STR_STORE_STR_RETURN(cfg, variable, plotter_scripts_dir, value);
+	TEST_STR_STORE_STR_RETURN(cfg, variable, images_output_dir, value);
+	TEST_STR_STORE_STR_RETURN(cfg, variable, device_path, value);
+	TEST_STR_STORE_STR_RETURN(cfg, variable, log_path, value);
+	TEST_STR_STORE_INT_RETURN(cfg, variable, baudrate, value);
+
+	return -1;
+}
+
+static int read_config_file(FILE *file, struct plotter_config *cfg)
+{
+	char line[1024];
+	char *variable, *value;
+
+	while (fgets(line, sizeof(line), file)) {
+		if (parse_config_line(line, &variable, &value))
+			continue;
+
+		if (!store_variable_value_to_plotter_config(variable, value,
+								cfg))
+			continue;
+
+		pr_debug("Discarding unsupported config variable %s\n",
+			variable);
+	}
+
+	return 0;
+}
+
+int populate_config_data_from_file(const char *path,
+				struct plotter_config *cfg)
+{
+	glob_t globbuf;
+	FILE *file;
+	int ret;
+
+	ret = glob(path, GLOB_TILDE, NULL, &globbuf);
+	if (ret)
+		return -1;
+
+	if (globbuf.gl_pathc == 0) {
+		pr_debug("No config file foud from path %s\n", path);
+		return -1;
+	}
+
+	if (globbuf.gl_pathc > 1) {
+		pr_warn("Found multiple config files from path %s, using the first one\n",
+			path);
+	}
+
+	file = fopen(globbuf.gl_pathv[0], "r");
+	if (!file) {
+		pr_err("Failed to open config file %s: %m\n",
+			globbuf.gl_pathv[0]);
+		return -1;
+	}
+
+	return read_config_file(file, cfg);
+}