ckplot

commit aea924ad6024503604067e50ae0b64a870bb9c96
parent c6adc9093fb429480d8a752308eac1b626f45957
Author: aabacchus <ben@bvnf.space>
Date:   Sun,  3 Oct 2021 00:26:29 +0100

kplot: allow reading from stdin

Diffstat:
M
kplot.c
 | 
21
++++++++++-----------

1 file changed, 10 insertions(+), 11 deletions(-)
diff --git a/kplot.c b/kplot.c
@@ -9,7 +9,7 @@
 
 void
 usage(char *argv0) {
-    fprintf(stderr, "usage: %s [-H] file.csv\n", argv0);
+    fprintf(stderr, "usage: %s [-H] [file.csv]\n", argv0);
     fprintf(stderr, "    -H    treat first line as header\n");
 }
 
@@ -28,17 +28,16 @@ main(int argc, char **argv) {
         }
     }
 
+    FILE *f;
     if (argc - optind == 0) {
-        usage(*argv);
-        return 1;
-    }
-
-    argv += optind;
-
-    FILE *f = fopen(*argv, "r");
-    if (f == NULL) {
-        perror(*argv);
-        return 1;
+        f = stdin;
+    } else {
+        argv += optind;
+        f = fopen(*argv, "r");
+        if (f == NULL) {
+            perror(*argv);
+            return 1;
+        }
     }
 
     struct csv *c = csv_create();