[lasem] render: emit error messages to stderr

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 82c79bb4a343b49cff905b895293e7baf5631b65
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Tue Jun 28 20:55:13 2016 +0200

    render: emit error messages to stderr

 src/lasemrender.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)
---
diff --git a/src/lasemrender.c b/src/lasemrender.c
index e876773..de2ca2f 100644
--- a/src/lasemrender.c
+++ b/src/lasemrender.c
@@ -27,7 +27,6 @@
 #include <lsmmathml.h>
 #include <glib.h>
 #include <glib/gi18n.h>
-#include <glib/gprintf.h>
 #include <gio/gio.h>
 #include <cairo-pdf.h>
 #include <cairo-svg.h>
@@ -104,21 +103,21 @@ int main(int argc, char **argv)
        if (!g_option_context_parse (context, &argc, &argv, &error))
        {
                g_option_context_free (context);
-               printf ("%s %s\n", _("Option parsing failed:"), error->message);
+               fprintf (stderr, "%s %s\n", _("Option parsing failed:"), error->message);
                return EXIT_FAILURE;
        }
 
        g_option_context_free (context);
 
        if (option_zoom < 0.0) {
-               printf ("%s\n", _("Invalid zoom value"));
+               fprintf (stderr, "%s\n", _("Invalid zoom value"));
                return EXIT_FAILURE;
        }
 
        lsm_debug_enable (option_debug_domains);
 
        if (option_input_filenames == NULL || g_strv_length (option_input_filenames) > 1) {
-               printf ("%s\n", _("Missing input filename"));
+               fprintf (stderr, "%s\n", _("Missing input filename"));
                return EXIT_FAILURE;
        }
 
@@ -129,7 +128,7 @@ int main(int argc, char **argv)
                        if (g_ascii_strcasecmp (option_output_file_format, file_formats[format]) == 0)
                                break;
                if (FORMAT_UNKNOWN == format) {
-                       printf ("%s %s\n", _("Unknown format:"), option_output_file_format);
+                       fprintf (stderr, "%s %s\n", _("Unknown format:"), option_output_file_format);
                        return EXIT_FAILURE;
                }
        } else
@@ -169,7 +168,7 @@ int main(int argc, char **argv)
        }
 
        if (format == FORMAT_UNKNOWN) {
-               printf ("%s\n", _("Don't know which format to use, please either give a format (-f) or an 
output filename (-o)"));
+               fprintf (stderr, "%s\n", _("Don't know which format to use, please either give a format (-f) 
or an output filename (-o)"));
                return EXIT_FAILURE;
        }
 
@@ -259,8 +258,8 @@ int main(int argc, char **argv)
 
                lsm_debug_render ("width = %g pt, height = %g pt",  width_pt, height_pt);
        } else {
-               printf (_("Can't load '%s'"), input_filename);
-               printf ("\n");
+               fprintf (stderr, _("Can't load '%s'"), input_filename);
+               fprintf (stderr, "\n");
 
                return EXIT_FAILURE;
        }