Move function for configfile parsing into configfile.[ch]

This is a generic function which wanted its own little object file.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/configfile.c b/configfile.c
new file mode 100644
index 0000000..4908058
--- /dev/null
+++ b/configfile.c
@@ -0,0 +1,87 @@
+/* configfile.c: parsing of config files
+ *
+ * Copyright (C) 2008 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include "configfile.h"
+
+int next_char(FILE *f)
+{
+	int c = fgetc(f);
+	if (c=='\r') {
+		c = fgetc(f);
+		if (c!='\n') {
+			ungetc(c, f);
+			c = '\r';
+		}
+	}
+	return c;
+}
+
+void skip_line(FILE *f)
+{
+	int c;
+
+	while((c=next_char(f)) && c!='\n' && c!=EOF)
+		;
+}
+
+int read_config_line(FILE *f, char *line, const char **value, int bufsize)
+{
+	int i = 0, isname = 0;
+
+	*value = NULL;
+	while(i<bufsize-1) {
+		int c = next_char(f);
+		if (!isname && (c=='#' || c==';')) {
+			skip_line(f);
+			continue;
+		}
+		if (!isname && isspace(c))
+			continue;
+
+		if (c=='=' && !*value) {
+			line[i] = 0;
+			*value = &line[i+1];
+		} else if (c=='\n' && !isname) {
+			i = 0;
+			continue;
+		} else if (c=='\n' || c==EOF) {
+			line[i] = 0;
+			break;
+		} else {
+			line[i]=c;
+		}
+		isname = 1;
+		i++;
+	}
+	line[i+1] = 0;
+	return i;
+}
+
+int parse_configfile(const char *filename, configfile_value_fn fn)
+{
+	static int nesting;
+	int len;
+	char line[256];
+	const char *value;
+	FILE *f;
+
+	/* cancel deeply nested include-commands */
+	if (nesting > 8)
+		return -1;
+	if (!(f = fopen(filename, "r")))
+		return -1;
+	nesting++;
+	while((len = read_config_line(f, line, &value, sizeof(line))) > 0)
+		fn(line, value);
+	nesting--;
+	fclose(f);
+	return 0;
+}
+