man: move more examples to stand-alone files and use 2-space indentation consistenty

Moving them out makes it easier to run them through a compiler, use automatic
indentation, and opens the possibility to provide a download link in the
future. I verified that all examples compile cleanly.

(2-space indentation is used because the examples are already significantly
indented in the man page, and we need to keep them narrow so that they display
well on standard terminals.)

6 files changed, 58 insertions, 57 deletions

diff --git a/man/id128-app-specific.c b/man/id128-app-specific.c
new file mode 100644
index 0000000000..b81e50ff32
--- /dev/null
+++ b/man/id128-app-specific.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <systemd/sd-id128.h>
+
+#define OUR_APPLICATION_ID SD_ID128_MAKE(c2,73,27,73,23,db,45,4e,a6,3b,b9,6e,79,b5,3e,97)
+
+int main(int argc, char *argv[]) {
+  sd_id128_t id;
+  sd_id128_get_machine_app_specific(OUR_APPLICATION_ID, &id);
+  printf("Our application ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(id));
+  return 0;
+}
diff --git a/man/journal-iterate-unique.c b/man/journal-iterate-unique.c
new file mode 100644
index 0000000000..fcf92e7b3f
--- /dev/null
+++ b/man/journal-iterate-unique.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <string.h>
+#include <systemd/sd-journal.h>
+
+int main(int argc, char *argv[]) {
+  sd_journal *j;
+  const void *d;
+  size_t l;
+  int r;
+
+  r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
+  if (r < 0) {
+    fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
+    return 1;
+  }
+  r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
+  if (r < 0) {
+    fprintf(stderr, "Failed to query journal: %s\n", strerror(-r));
+    return 1;
+  }
+  SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
+    printf("%.*s\n", (int) l, (const char*) d);
+  sd_journal_close(j);
+  return 0;
+}
diff --git a/man/sd_bus_new.xml b/man/sd_bus_new.xml
index 5180ae7815..59117676fd 100644
--- a/man/sd_bus_new.xml
+++ b/man/sd_bus_new.xml
@@ -96,13 +96,13 @@
     block is left:</para>
 
     <programlisting>{
-        __attribute__((cleanup(sd_bus_unrefp)) sd_bus *bus = NULL;
-        int r;
-        …
-        r = sd_bus_default(&amp;bus);
-        if (r &lt; 0)
-                fprintf(stderr, "Failed to allocate bus: %s\n", strerror(-r));
-        …
+  __attribute__((cleanup(sd_bus_unrefp)) sd_bus *bus = NULL;
+  int r;
+  …
+  r = sd_bus_default(&amp;bus);
+  if (r &lt; 0)
+    fprintf(stderr, "Failed to allocate bus: %s\n", strerror(-r));
+  …
 }</programlisting>
 
     <para><function>sd_bus_ref()</function> and <function>sd_bus_unref()</function>
diff --git a/man/sd_id128_get_machine.xml b/man/sd_id128_get_machine.xml
index 954fd2e6a7..9587aa7d66 100644
--- a/man/sd_id128_get_machine.xml
+++ b/man/sd_id128_get_machine.xml
@@ -120,17 +120,7 @@
 
       <para>Here's a simple example for an application specific machine ID:</para>
 
-      <programlisting>#include &lt;systemd/sd-id128.h&gt;
-#include &lt;stdio.h&gt;
-
-#define OUR_APPLICATION_ID SD_ID128_MAKE(c2,73,27,73,23,db,45,4e,a6,3b,b9,6e,79,b5,3e,97)
-
-int main(int argc, char *argv[]) {
-        sd_id128_t id;
-        sd_id128_get_machine_app_specific(OUR_APPLICATION_ID, &amp;id);
-        printf("Our application ID: " SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(id));
-        return 0;
-}</programlisting>
+      <programlisting><xi:include href="id128-app-specific.c" parse="text" /></programlisting>
     </example>
   </refsect1>
 
diff --git a/man/sd_journal_query_unique.xml b/man/sd_journal_query_unique.xml
index 0bbc479f22..c62f333eab 100644
--- a/man/sd_journal_query_unique.xml
+++ b/man/sd_journal_query_unique.xml
@@ -140,32 +140,7 @@
     following example lists all unit names referenced in the
     journal:</para>
 
-    <programlisting>#include &lt;stdio.h&gt;
-#include &lt;string.h&gt;
-#include &lt;systemd/sd-journal.h&gt;
-
-int main(int argc, char *argv[]) {
-        sd_journal *j;
-        const void *d;
-        size_t l;
-        int r;
-
-        r = sd_journal_open(&amp;j, SD_JOURNAL_LOCAL_ONLY);
-        if (r &lt; 0) {
-                fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
-                return 1;
-        }
-        r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
-        if (r &lt; 0) {
-                fprintf(stderr, "Failed to query journal: %s\n", strerror(-r));
-                return 1;
-        }
-        SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
-                printf("%.*s\n", (int) l, (const char*) d);
-        sd_journal_close(j);
-        return 0;
-}</programlisting>
-
+    <programlisting><xi:include href="journal-iterate-unique.c" parse="text" /></programlisting>
   </refsect1>
 
   <refsect1>
diff --git a/man/sd_login_monitor_new.xml b/man/sd_login_monitor_new.xml
index 23f685bb31..d914e51d0d 100644
--- a/man/sd_login_monitor_new.xml
+++ b/man/sd_login_monitor_new.xml
@@ -115,13 +115,13 @@
     code block is left:</para>
 
     <programlisting>{
-        __attribute__((cleanup(sd_login_monitor_unrefp)) sd_login_monitor *m = NULL;
-        int r;
-        …
-        r = sd_login_monitor_default(&amp;m);
-        if (r &lt; 0)
-                fprintf(stderr, "Failed to allocate login monitor object: %s\n", strerror(-r));
-        …
+  __attribute__((cleanup(sd_login_monitor_unrefp)) sd_login_monitor *m = NULL;
+  int r;
+  …
+  r = sd_login_monitor_default(&amp;m);
+  if (r &lt; 0)
+    fprintf(stderr, "Failed to allocate login monitor object: %s\n", strerror(-r));
+  …
 }</programlisting>
 
     <para><function>sd_login_monitor_flush()</function> may be used to
@@ -176,13 +176,13 @@
 int msec;
 sd_login_monitor_get_timeout(m, &amp;t);
 if (t == (uint64_t) -1)
-         msec = -1;
+  msec = -1;
 else {
-         struct timespec ts;
-         uint64_t n;
-         clock_gettime(CLOCK_MONOTONIC, &amp;ts);
-         n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
-         msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
+  struct timespec ts;
+  uint64_t n;
+  clock_gettime(CLOCK_MONOTONIC, &amp;ts);
+  n = (uint64_t) ts.tv_sec * 1000000 + ts.tv_nsec / 1000;
+  msec = t > n ? (int) ((t - n + 999) / 1000) : 0;
 }</programlisting>
 
     <para>The code above does not do any error checking for brevity's