rfc822: Add an example program

Add a simple full-blown example program for the rfc822 module.
'headernames' simply dumps the header field name for every header field in
each message file given on the command line to stdout.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/ccan/rfc822/examples/.gitignore b/ccan/rfc822/examples/.gitignore
new file mode 100644 (file)
index 0000000..18c657d
--- /dev/null
+++ b/ccan/rfc822/examples/.gitignore
@@ -0,0 +1 @@
+headernames

diff --git a/ccan/rfc822/examples/Makefile b/ccan/rfc822/examples/Makefile
new file mode 100644 (file)
index 0000000..bb20fc0
--- /dev/null
+++ b/ccan/rfc822/examples/Makefile
@@ -0,0 +1,10 @@
+CFLAGS= -I../../.. ../../rfc822.o \
+       ../../talloc/talloc.o ../../grab_file/grab_file.o \
+       ../../list/list.o ../../noerr/noerr.o
+
+EXAMPLES = headernames
+
+all: $(EXAMPLES)
+
+clean:
+       rm -f $(EXAMPLES)

diff --git a/ccan/rfc822/examples/headernames.c b/ccan/rfc822/examples/headernames.c
new file mode 100644 (file)
index 0000000..161ceab
--- /dev/null
+++ b/ccan/rfc822/examples/headernames.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <ccan/talloc/talloc.h>
+#include <ccan/grab_file/grab_file.h>
+#include <ccan/rfc822/rfc822.h>
+
+static void process_file(const char *name)
+{
+       void *ctx = talloc_new(NULL);
+       size_t size;
+       void *buf;
+       struct rfc822_msg *msg;
+       struct rfc822_header *hdr;
+
+       buf = grab_file(ctx, name, &size);
+
+       msg = rfc822_start(ctx, buf, size);
+
+       rfc822_for_each_header(msg, hdr) {
+               struct bytestring hname = rfc822_header_raw_name(msg, hdr);
+
+               printf("%.*s\n", hname.len, hname.ptr);
+       }
+
+       talloc_free(ctx);
+}
+
+int main(int argc, char *argv[])
+{
+       int i;
+
+       for (i = 0; i < (argc - 1); i++)
+               process_file(argv[i + 1]);
+
+       exit(0);
+}