From c40f400f6ab879e08d54de753aabc987fd6ba07a Mon Sep 17 00:00:00 2001
From: Jacob McDonnell <jacob@jacobmcdonnell.com>
Date: Tue, 5 Mar 2024 18:46:44 -0500
Subject: Added a simple shell, jsh

---
 src/cmd/cat/cat.c    | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/cmd/cat/makefile | 12 ++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100755 src/cmd/cat/cat.c
 create mode 100755 src/cmd/cat/makefile

(limited to 'src/cmd/cat')

diff --git a/src/cmd/cat/cat.c b/src/cmd/cat/cat.c
new file mode 100755
index 0000000..1c3e40a
--- /dev/null
+++ b/src/cmd/cat/cat.c
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdbool.h>
+
+void fileoutput(FILE *, const char *);
+bool isdir(const char *);
+
+/* concatinate files to a file stream */
+int main(int argc, char **argv)
+{
+	FILE *fp;
+	if (argc == 1) {
+		fileoutput(stdin, "stdin");
+	} else {
+		while (--argc > 0 && !ferror(stdout)) {
+			if (isdir(*++argv)) {
+				perror("cat");
+				continue;
+			}
+			if ((fp = fopen(*argv, "r")) == NULL) {
+				perror("cat");
+				continue;
+			}
+			fileoutput(fp, *argv);
+		}
+	}
+	if (ferror(stdout)) {
+		perror("cat");
+		return -1;
+	}
+	return 0;
+}
+
+/* fileoutput: output a file to stdout */
+void fileoutput(FILE *fp, const char *name)
+{
+	int c;
+	while ((c = getc(fp)) != EOF)
+		putc(c, stdout);
+	if (ferror(fp)) {
+		perror("cat");
+	}
+	fclose(fp);
+}
+
+/* isdir: return true if the file as the path is a directory */
+bool isdir(const char *path)
+{
+	struct stat sbuf;
+	stat(path, &sbuf);
+	return S_ISDIR(sbuf.st_mode);
+}
+
diff --git a/src/cmd/cat/makefile b/src/cmd/cat/makefile
new file mode 100755
index 0000000..bb8db9e
--- /dev/null
+++ b/src/cmd/cat/makefile
@@ -0,0 +1,12 @@
+CFLAGS=-Wall -Werror
+
+build: cat
+	@cp cat $(PROROOT)/build/bin/cat
+
+cat: cat.c
+	$(CC) $(CFLAGS) -o cat cat.c
+
+clean:
+	@rm -r cat
+
+.PHONY: build clean
-- 
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