[PATCH 09/16] vcs-svn: Allow input errors to be detected early

[Jonathan Nieder <jrnieder@gmail.com>]

Add a buffer_ferror() function to read the error flag from the input
stream, so callers can do:

	some_error_prone_operation(f, ...);
	if (buffer_ferror(f))
		return error("input error: %s", strerror(errno));

instead of waiting until it is time to close the file.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 vcs-svn/line_buffer.c |    5 +++++
 vcs-svn/line_buffer.h |    1 +
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/vcs-svn/line_buffer.c b/vcs-svn/line_buffer.c
index 19caa21..43da509 100644
--- a/vcs-svn/line_buffer.c
+++ b/vcs-svn/line_buffer.c
@@ -27,6 +27,11 @@ int buffer_deinit(struct line_buffer *buf)
 	return err;
 }
 
+int buffer_ferror(struct line_buffer *buf)
+{
+	return ferror(buf->infile);
+}
+
 int buffer_at_eof(struct line_buffer *buf)
 {
 	int ch;
diff --git a/vcs-svn/line_buffer.h b/vcs-svn/line_buffer.h
index 0269aed..4899289 100644
--- a/vcs-svn/line_buffer.h
+++ b/vcs-svn/line_buffer.h
@@ -14,6 +14,7 @@ struct line_buffer {
 
 int buffer_init(struct line_buffer *buf, const char *filename);
 int buffer_deinit(struct line_buffer *buf);
+int buffer_ferror(struct line_buffer *buf);
 int buffer_at_eof(struct line_buffer *buf);
 char *buffer_read_line(struct line_buffer *buf);
 char *buffer_read_string(struct line_buffer *buf, uint32_t len);
-- 
1.7.2.3