[ccan] [PATCH 6/9] configurator: Print test source without cat

[Kevin Locke]

Windows does not provide cat.  Instead, copy the test source to stdout
using the file stream to which it was written.

Signed-off-by: Kevin Locke <kevin at kevinlocke.name>
---
 tools/configurator/configurator.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/tools/configurator/configurator.c b/tools/configurator/configurator.c
index 0307635..0386930 100644
--- a/tools/configurator/configurator.c
+++ b/tools/configurator/configurator.c
@@ -422,6 +422,22 @@ static void errx(int status, const char *fmt, ...)
 	va_end(ap);
 }
 
+static size_t fcopy(FILE *fsrc, FILE *fdst)
+{
+	char buffer[BUFSIZ];
+	size_t rsize, wsize;
+	size_t copied = 0;
+
+	while ((rsize = fread(buffer, 1, BUFSIZ, fsrc)) > 0) {
+		wsize = fwrite(buffer, 1, rsize, fdst);
+		copied += wsize;
+		if (wsize != rsize)
+			break;
+	}
+
+	return copied;
+}
+
 static char *grab_stream(FILE *file)
 {
 	size_t max, ret, size = 0;
@@ -545,7 +561,7 @@ static bool run_test(const char *cmd, struct test *test)
 		}
 	}
 
-	outf = fopen(INPUT_FILE, "w");
+	outf = fopen(INPUT_FILE, verbose > 1 ? "w+" : "w");
 	if (!outf)
 		err(1, "creating %s", INPUT_FILE);
 
@@ -576,11 +592,13 @@ static bool run_test(const char *cmd, struct test *test)
 		abort();
 
 	}
-	fclose(outf);
 
-	if (verbose > 1)
-		if (system("cat " INPUT_FILE) == -1)
-			;
+	if (verbose > 1) {
+		fseek(outf, 0, SEEK_SET);
+		fcopy(outf, stdout);
+	}
+
+	fclose(outf);
 
 	newcmd = strdup(cmd);
 
-- 
2.9.3