preprocessor: implement -o in pptest

diff --git a/preprocessor.c b/preprocessor.c
index 3449063..4e1dc25 100644 (file)
--- a/preprocessor.c
+++ b/preprocessor.c
@@ -1833,6 +1833,7 @@ int pptest_main(int argc, char **argv)
 
        /* simplistic commandline parser */
        const char *filename = NULL;
+       const char *output = NULL;
        for (int i = 1; i < argc; ++i) {
                const char *opt = argv[i];
                if (streq(opt, "-I")) {
@@ -1840,6 +1841,9 @@ int pptest_main(int argc, char **argv)
                        continue;
                } else if (streq(opt, "-E")) {
                        /* ignore */
+               } else if (streq(opt, "-o")) {
+                       output = argv[++i];
+                       continue;
                } else if (opt[0] == '-') {
                        fprintf(stderr, "Unknown option '%s'\n", opt);
                } else {
@@ -1853,7 +1857,15 @@ int pptest_main(int argc, char **argv)
                return 1;
        }
 
-       out = stdout;
+       if (output == NULL) {
+               out = stdout;
+       } else {
+               out = fopen(output, "w");
+               if (out == NULL) {
+                       fprintf(stderr, "Couldn't open output '%s'\n", output);
+                       return 1;
+               }
+       }
 
        /* just here for gcc compatibility */
        fprintf(out, "# 1 \"%s\"\n", filename);
@@ -1922,6 +1934,8 @@ end_of_main_loop:
        fputc('\n', out);
        check_unclosed_conditionals();
        close_input();
+       if (out != stdout)
+               fclose(out);
 
        obstack_free(&input_obstack, NULL);
        obstack_free(&pp_obstack, NULL);