From e68a0b4707885be3c016f3b4f9443740e5dcc25b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sat, 10 Jul 2021 16:21:59 +0200
Subject: Add name

---
 name.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 name.c

diff --git a/name.c b/name.c
new file mode 100644
index 0000000..a53d7e0
--- /dev/null
+++ b/name.c
@@ -0,0 +1,67 @@
+#include <err.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/select.h>
+
+#define MAXFILES 100	/* Maximum number of files. */
+#define MAXFILE 255	/* Maximum file name length. */
+#define MAXLINE MAXFILE+1
+
+void waitstdin(void);
+
+int
+main(int argc, char *argv[])
+{
+	char file[30];
+	char from[MAXLINE], *froms[MAXFILES], to[MAXLINE], *tos[MAXFILES];
+	FILE *fp;
+	int i, j;
+
+	/* Allocate memory. */
+	for (i = 0; i < MAXFILES; i++)
+		if (!(froms[i]=malloc(MAXFILE)) || !(tos[i]=malloc(MAXFILE)))
+			err(1, "malloc");
+
+	sprintf(file, "/var/tmp/re.%d", getppid());
+
+	if (waitstdin(), access(file, F_OK)) {
+		fprintf(stderr, "%s: %s does not exist\n", argv[0], file);
+		return 1;
+	}
+
+	if (!(fp = fopen(file, "r")))
+		err(1, "fopen");
+
+	for (i = 0; fgets(from, MAXLINE, fp); i++) {
+		from[strcspn(from, "\n")] = 0;
+		strcpy(froms[i], from);
+		printf("from %s\n", from);
+	}
+
+	for (j = 0; fgets(to, MAXLINE, stdin); j++) {
+		to[strcspn(to, "\n")] = 0;
+		strcpy(tos[j], to);
+		printf("to %s\n", to);
+	}
+
+	if (i != j) {
+		fprintf(stderr, "%s: too %s lines\n",
+			argv[0], j > i ? "many" : "few");
+		return 1;
+	}
+
+	fclose(fp);
+}
+
+void
+waitstdin()
+{
+	fd_set readfds;
+
+	FD_ZERO(&readfds);
+	FD_SET(0, &readfds);
+	if (select(1, &readfds, NULL, NULL, NULL) == -1)
+		err(1, "select");
+}
-- 
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