1 file changed, 113 insertions, 0 deletions
diff --git a/source/config.c b/source/config.c
new file mode 100644
index 0000000..6a5d136
--- /dev/null
+++ b/source/config.c
@@ -0,0 +1,113 @@
+/*
+ * The reader for cgit's config files, which are the main cgitrc, any file it
+ * pulls in with an include line, the cgitrc that sits beside a scanned
+ * repository, and the cached repolist. A file is a sequence of name=value
+ * lines, and each pair is handed to a callback that decides what it means, so
+ * nothing here knows a single key by name. A value runs to the end of its line
+ * and keeps whatever spacing it has, there is no quoting. A line whose first
+ * non blank character is a hash or a semicolon is a comment, and blank lines
+ * are ignored.
+ */
+
+#include "cgit.h"
+#include "config.h"
+
+#define MAX_INCLUDE_NESTING 8
+
+/*
+ * Folds away a carriage return that sits right before a newline so a file
+ * saved with DOS line endings parses the same as one saved with Unix endings.
+ */
+static 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;
+}
+
+static void skip_line(FILE *f)
+{
+	int c;
+
+	while ((c = next_char(f)) && c != '\n' && c != EOF)
+		;
+}
+
+static int next_content_char(FILE *f)
+{
+	int c = next_char(f);
+
+	for (;;) {
+		if (c == EOF)
+			return EOF;
+		if (c == '#' || c == ';')
+			skip_line(f);
+		else if (!isspace(c))
+			return c;
+		c = next_char(f);
+	}
+}
+
+static int read_entry(FILE *f, struct strbuf *name, struct strbuf *value)
+{
+	int c;
+
+	strbuf_reset(value);
+
+	for (;;) {
+		c = next_content_char(f);
+		if (c == EOF)
+			return 0;
+
+		strbuf_reset(name);
+		while (c != '=' && c != '\n' && c != EOF) {
+			strbuf_addch(name, c);
+			c = next_char(f);
+		}
+		if (c == EOF)
+			return 0;
+		// Dropping just the line with no equals sign keeps one typo
+		// from hiding the rest of the file.
+		if (c != '=')
+			continue;
+
+		c = next_char(f);
+		while (c != '\n' && c != EOF) {
+			strbuf_addch(value, c);
+			c = next_char(f);
+		}
+
+		return 1;
+	}
+}
+
+int config_file_parse(const char *filename, config_file_value_fn fn)
+{
+	static int nesting;
+	struct strbuf name = STRBUF_INIT;
+	struct strbuf value = STRBUF_INIT;
+	FILE *f;
+
+	// An include line calls back into here, so a file that includes itself,
+	// directly or round a longer loop, would recurse until the stack gave
+	// out.
+	if (nesting > MAX_INCLUDE_NESTING)
+		return -1;
+	if (!(f = fopen(filename, "r")))
+		return -1;
+	nesting++;
+	while (read_entry(f, &name, &value))
+		fn(name.buf, value.buf);
+	nesting--;
+	fclose(f);
+	strbuf_release(&name);
+	strbuf_release(&value);
+	return 0;
+}