vcs-svn: add binary-safe read function

buffer_read_string works well for non line-oriented input except for
one problem: it does not tell the caller how many bytes were actually
written.  This means that unless one is very careful about checking
for errors (and eof) the calling program cannot tell the difference
between the string "foo" followed by an early end of file and the
string "foo\0bar\0baz".

So introduce a variant that reports the length, too, a thinner wrapper
around strbuf_fread.  Its result is written to a strbuf so the caller
does not need to keep track of the number of bytes read.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/test-line-buffer.c b/test-line-buffer.c
index ec19b13ee2..19bf2d4403 100644
--- a/test-line-buffer.c
+++ b/test-line-buffer.c
@@ -3,6 +3,7 @@
  */
 
 #include "git-compat-util.h"
+#include "strbuf.h"
 #include "vcs-svn/line_buffer.h"
 
 static uint32_t strtouint32(const char *s)
@@ -17,6 +18,15 @@ static uint32_t strtouint32(const char *s)
 static void handle_command(const char *command, const char *arg, struct line_buffer *buf)
 {
 	switch (*command) {
+	case 'b':
+		if (!prefixcmp(command, "binary ")) {
+			struct strbuf sb = STRBUF_INIT;
+			strbuf_addch(&sb, '>');
+			buffer_read_binary(buf, &sb, strtouint32(arg));
+			fwrite(sb.buf, 1, sb.len, stdout);
+			strbuf_release(&sb);
+			return;
+		}
 	case 'c':
 		if (!prefixcmp(command, "copy ")) {
 			buffer_copy_bytes(buf, strtouint32(arg));