From e8627d18b48f68d825976f839fd5b1b35173bf40 Mon Sep 17 00:00:00 2001
From: Cameron Katri <me@cameronkatri.com>
Date: Mon, 26 Apr 2021 22:02:19 -0400
Subject: Sane errors, Linux support(?), stdin support

---
 dirconvert.c    | 37 +++++++++++++++++++++++++------------
 opendircolors.c | 35 ++++++++++++++++++++++++++---------
 2 files changed, 51 insertions(+), 21 deletions(-)

diff --git a/dirconvert.c b/dirconvert.c
index 5169a05..0b93884 100644
--- a/dirconvert.c
+++ b/dirconvert.c
@@ -32,27 +32,37 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
+#include <libgen.h>
 
 #include "common.h"
 
-void usage(void);
+void usage(const char *);
 char *tols_colors(char *);
 
 int
 main(int argc, char **argv)
 {
 	if (argc != 2)
-		usage();
+		usage(argv[0]);
 
-	if (strchr(argv[1], '=')) {
-		printf("%s\n", tolscolors(argv[1]));
-		return (0);
-	} else {
-		printf("%s\n", tols_colors(argv[1]));
-		return (0);
-	}
+	char *input = NULL;
+	if (strcmp(argv[1], "-") == 0) {
+		char *buf = NULL;
+		size_t linecap = 0;
+		ssize_t linelen;
+		getline(&buf, &linecap, stdin);
+		if (buf[sizeof(buf) - 1] == '\n')
+			buf[sizeof(buf) - 1] = '\0';
+		input = strdup(buf);
+		free(buf);
+	} else
+		input = argv[1];
+
+	if (strchr(input, '='))
+		fprintf(stdout, "%s\n", tolscolors(input));
+	else
+		fprintf(stdout, "%s\n", tols_colors(input));
 
-	/* NOTREACHED */
 	return (0);
 }
 
@@ -83,8 +93,11 @@ tols_colors(char *lscolors)
 }
 
 void
-usage(void)
+usage(const char *progname)
 {
-	(void)fprintf(stderr, "usage: %s LSCOLORS|LS_COLORS\n", getprogname());
+	char *path;
+	path = strdup(progname);
+
+	(void)fprintf(stderr, "usage: %s LSCOLORS|LS_COLORS\n", basename(path));
 	exit(EX_USAGE);
 }
diff --git a/opendircolors.c b/opendircolors.c
index 726ad3f..6f91f0d 100644
--- a/opendircolors.c
+++ b/opendircolors.c
@@ -31,10 +31,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sysexits.h>
+#include <errno.h>
+#include <libgen.h>
+#include <err.h>
 
 #include "common.h"
 
-void usage(void);
+void usage(const char*);
 
 #define MAXKEYLEN 21
 
@@ -62,6 +65,7 @@ int
 main(int argc, char **argv)
 {
 	int ch;
+	FILE *fd;
 	char *prefix = "LS_COLORS='";
 	char *suffix = "';\nexport LS_COLORS";
 	char *lsprefix = "LSCOLORS='";
@@ -85,14 +89,22 @@ main(int argc, char **argv)
 		case 'h':
 		case '?':
 		default:
-			usage();
+			usage(argv[0]);
 		}
 	}
 	argc -= optind;
 	argv += optind;
 
-	char *path = *argv != NULL ? *argv++ : "-";
-	FILE *fd = fopen(path, "r");
+	if (argc != 1)
+		usage(argv[1]);
+
+	char *path = *argv;
+	if (strcmp(path, "-") == 0)
+		fd = stdin;
+	else if ((fd = fopen(path, "r")) == NULL) {
+		warnx("%s: %s\n", path, strerror(errno));
+		return(errno);
+	}
 
 	char *line = NULL;
 	size_t linecap = 0;
@@ -119,18 +131,23 @@ main(int argc, char **argv)
 			}
 		}
 	}
+	fclose(fd);
+
+	fprintf(stdout, "%s%s%s\n", prefix, out, suffix);
+	fprintf(stdout, "%s%s%s\n", lsprefix, tolscolors(out), lssuffix);
+
 	free(line);
-	printf("%s%s%s\n", prefix, out, suffix);
-	printf("%s%s%s\n", lsprefix, tolscolors(out), lssuffix);
 	free(out);
 
-	/* NOTREACHED */
 	return (0);
 }
 
 void
-usage(void)
+usage(const char *progname)
 {
-	(void)fprintf(stderr, "usage: %s [-bch] [FILE]\n", getprogname());
+	char *path;
+	path = strdup(progname);
+
+	(void)fprintf(stderr, "usage: %s [-bch] [FILE]\n", basename(path));
 	exit(EX_USAGE);
 }
-- 
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