vcs-svn: allow character-oriented input

buffer_read_char can be used in place of buffer_read_string(1) to
avoid consuming valuable static buffer space.  The delta applier will
use this to read variable-length integers one byte at a time.

Underneath, it is fgetc, wrapped so the line_buffer library can
maintain its role as gatekeeper of input.

Later it might be worth checking if fgetc_unlocked is faster ---
most line_buffer functions are not thread-safe anyway.
Helpd-by: NDavid Barr <david.barr@cordelta.com>
Signed-off-by: NJonathan Nieder <jrnieder@gmail.com>

vcs-svn/line_buffer.c

@@ -27,6 +27,11 @@ int buffer_deinit(struct line_buffer *buf)
 	return err;
 }
 
+int buffer_read_char(struct line_buffer *buf)
+{
+	return fgetc(buf->infile);
+}
+
 /* Read a line without trailing newline. */
 char *buffer_read_line(struct line_buffer *buf)
 {

vcs-svn/line_buffer.h

@@ -16,6 +16,7 @@ int buffer_init(struct line_buffer *buf, const char *filename);
 int buffer_deinit(struct line_buffer *buf);
 char *buffer_read_line(struct line_buffer *buf);
 char *buffer_read_string(struct line_buffer *buf, uint32_t len);
+int buffer_read_char(struct line_buffer *buf);
 void buffer_read_binary(struct line_buffer *buf, struct strbuf *sb, uint32_t len);
 void buffer_copy_bytes(struct line_buffer *buf, uint32_t len);
 void buffer_skip_bytes(struct line_buffer *buf, uint32_t len);