migrate to gitlab

1 files changed, 95 insertions, 0 deletions

diff --git a/head.c b/head.c
new file mode 100644
index 0000000..59e53f6
--- /dev/null
+++ b/head.c
@@ -0,0 +1,95 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static int head(const char *path, int nlines)
+{
+	FILE *f = stdin;
+	if (path && strcmp(path, "-")) {
+		f = fopen(path, "rb");
+	}
+
+	if (f == NULL) {
+		fprintf(stderr, "FIXME: Couldn't open %s: %s\n", path ? path : "stdin", strerror(errno));
+		return 1;
+	}
+
+	while (!feof(f) && nlines > 0) {
+		char *line = NULL;
+		size_t n = 0;
+
+		getline(&line, &n, f);
+		fputs(line, stdout);
+		nlines--;
+	}
+
+	if (f != stdin) {
+		fclose(f);
+	}
+
+	return 0;
+}
+
+int main(int argc, char **argv)
+{
+	int lines = 10;
+	int showname = 0;
+	char *end;
+
+	int c;
+	while ((c = getopt(argc, argv, ":n:")) != -1) {
+		switch (c) {
+		case 'n':
+			lines = strtol(optarg, &end, 10);
+			if (end != NULL && strlen(end) > 0) {
+				fprintf(stderr, "head: Invalid number %s\n", optarg);
+				return 1;
+			}
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (optind < argc - 1) {
+		showname = 1;
+	}
+
+	int r = 0;
+	do {
+		if (showname) {
+			if (showname == 1) {
+				showname++;
+			} else {
+				putchar('\n');
+			}
+			printf("==> %s <==\n", argv[optind]);
+		}
+		r |= head(argv[optind++], lines);
+	} while (optind < argc);
+
+	return r;
+}