1 files changed, 134 insertions, 0 deletions
diff --git a/src/libgit2/parse.c b/src/libgit2/parse.c
new file mode 100644
index 000000000..0a10758bf
--- /dev/null
+++ b/src/libgit2/parse.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#include "parse.h"
+
+int git_parse_ctx_init(git_parse_ctx *ctx, const char *content, size_t content_len)
+{
+	if (content && content_len) {
+		ctx->content = content;
+		ctx->content_len = content_len;
+	} else {
+		ctx->content = "";
+		ctx->content_len = 0;
+	}
+
+	ctx->remain = ctx->content;
+	ctx->remain_len = ctx->content_len;
+	ctx->line = ctx->remain;
+	ctx->line_len = git__linenlen(ctx->line, ctx->remain_len);
+	ctx->line_num = 1;
+
+	return 0;
+}
+
+void git_parse_ctx_clear(git_parse_ctx *ctx)
+{
+	memset(ctx, 0, sizeof(*ctx));
+	ctx->content = "";
+}
+
+void git_parse_advance_line(git_parse_ctx *ctx)
+{
+	ctx->line += ctx->line_len;
+	ctx->remain_len -= ctx->line_len;
+	ctx->line_len = git__linenlen(ctx->line, ctx->remain_len);
+	ctx->line_num++;
+}
+
+void git_parse_advance_chars(git_parse_ctx *ctx, size_t char_cnt)
+{
+	ctx->line += char_cnt;
+	ctx->remain_len -= char_cnt;
+	ctx->line_len -= char_cnt;
+}
+
+int git_parse_advance_expected(
+	git_parse_ctx *ctx,
+	const char *expected,
+	size_t expected_len)
+{
+	if (ctx->line_len < expected_len)
+		return -1;
+
+	if (memcmp(ctx->line, expected, expected_len) != 0)
+		return -1;
+
+	git_parse_advance_chars(ctx, expected_len);
+	return 0;
+}
+
+int git_parse_advance_ws(git_parse_ctx *ctx)
+{
+	int ret = -1;
+
+	while (ctx->line_len > 0 &&
+		ctx->line[0] != '\n' &&
+		git__isspace(ctx->line[0])) {
+		ctx->line++;
+		ctx->line_len--;
+		ctx->remain_len--;
+		ret = 0;
+	}
+
+	return ret;
+}
+
+int git_parse_advance_nl(git_parse_ctx *ctx)
+{
+	if (ctx->line_len != 1 || ctx->line[0] != '\n')
+		return -1;
+
+	git_parse_advance_line(ctx);
+	return 0;
+}
+
+int git_parse_advance_digit(int64_t *out, git_parse_ctx *ctx, int base)
+{
+	const char *end;
+	int ret;
+
+	if (ctx->line_len < 1 || !git__isdigit(ctx->line[0]))
+		return -1;
+
+	if ((ret = git__strntol64(out, ctx->line, ctx->line_len, &end, base)) < 0)
+		return -1;
+
+	git_parse_advance_chars(ctx, (end - ctx->line));
+	return 0;
+}
+
+int git_parse_advance_oid(git_oid *out, git_parse_ctx *ctx)
+{
+	if (ctx->line_len < GIT_OID_HEXSZ)
+		return -1;
+	if ((git_oid_fromstrn(out, ctx->line, GIT_OID_HEXSZ)) < 0)
+		return -1;
+	git_parse_advance_chars(ctx, GIT_OID_HEXSZ);
+	return 0;
+}
+
+int git_parse_peek(char *out, git_parse_ctx *ctx, int flags)
+{
+	size_t remain = ctx->line_len;
+	const char *ptr = ctx->line;
+
+	while (remain) {
+		char c = *ptr;
+
+		if ((flags & GIT_PARSE_PEEK_SKIP_WHITESPACE) &&
+		    git__isspace(c)) {
+			remain--;
+			ptr++;
+			continue;
+		}
+
+		*out = c;
+		return 0;
+	}
+
+	return -1;
+}