From ab400c0be5577cab2a66d242183887ebbd61717f Mon Sep 17 00:00:00 2001
From: Nicholas <nbnoll@eml.cc>
Date: Wed, 17 Nov 2021 08:22:03 -0800
Subject: checkin

---
 src/cmd/core/basename.c | 36 ++++++++++++++++++++++++++++++++++
 src/cmd/core/cat.c      | 52 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/cmd/core/date.c     | 37 +++++++++++++++++++++++++++++++++++
 src/cmd/core/rules.mk   | 19 ++++++++++++++++++
 4 files changed, 144 insertions(+)
 create mode 100644 src/cmd/core/basename.c
 create mode 100644 src/cmd/core/cat.c
 create mode 100644 src/cmd/core/date.c
 create mode 100644 src/cmd/core/rules.mk

(limited to 'src/cmd/core')

diff --git a/src/cmd/core/basename.c b/src/cmd/core/basename.c
new file mode 100644
index 0000000..ba9d4c9
--- /dev/null
+++ b/src/cmd/core/basename.c
@@ -0,0 +1,36 @@
+#include <u.h>
+#include <base.h>
+#include <libfmt.h>
+
+static void
+usage(void)
+{
+    fmt·fprint(2,"usage: %s [-d] path [suffix]\n", argv0);
+    exits("usage");
+}
+
+int
+main(int argc, char *argv[])
+{
+    int  d;
+    long n;
+    char *p, *s;
+
+    ARGBEGIN{
+    case 'd': d = 1; break;
+    default:
+        usage();
+    }ARGEND;
+
+    if(argc < 1 || argc > 2)
+        usage();
+
+    p = d ? os·dirname(argv[0]) : os·basename(argv[0]);
+    if(argc>1){
+        n = strlen(p)-strlen(argv[1]);
+        if(n >= 0 && strcmp(p+n, argv[1])==0)
+            p[n] = 0;
+    }
+    puts(p);
+    exits(nil);
+}
diff --git a/src/cmd/core/cat.c b/src/cmd/core/cat.c
new file mode 100644
index 0000000..4f0929c
--- /dev/null
+++ b/src/cmd/core/cat.c
@@ -0,0 +1,52 @@
+#include <u.h>
+#include <base.h>
+#include <libfmt.h>
+
+static void
+usage(void)
+{
+    fmt·panic("usage: %s [-u] [file ...]\n", argv0);
+    exits("usage");
+}
+
+static void
+cat(int fd, char *s)
+{
+    long n;
+    char buf[8192];
+
+    while((n=read(fd, buf, sizeof(buf)))>0){
+        if(write(1, buf, n) != n)
+            fmt·panic("write error copying %s: %r", s);
+    }
+
+    if(n<0)
+        fmt·panic("error reading %s: %r", s);
+}
+
+int
+main(int argc, char *argv[])
+{
+    int fd;
+
+    ARGBEGIN{
+    case 'u': /* ignore */ break;
+    default:
+        usage();
+    }ARGEND;
+
+    if(!argc){
+        cat(0, "<stdin>");
+        exits(0);
+    }
+
+    while(argc-- > 0){
+        if((fd = open(*argv, O_RDONLY))<0)
+            fmt·panic("can't open %s: %r", *argv);
+
+        cat(fd, *argv);
+        close(fd);
+
+        argv++;
+    }
+}
diff --git a/src/cmd/core/date.c b/src/cmd/core/date.c
new file mode 100644
index 0000000..225333f
--- /dev/null
+++ b/src/cmd/core/date.c
@@ -0,0 +1,37 @@
+#include <u.h>
+#include <base.h>
+#include <libfmt.h>
+
+static void
+usage(void)
+{
+    fmt·fprint(2, "usage: date [-un] [seconds]\n");
+    exits("usage");
+}
+
+int
+main(int argc, char *argv[])
+{
+    int n, u;
+    ulong now;
+
+    ARGBEGIN{
+    case 'n': n = 1; break;
+    case 'u': u = 1; break;
+    default: usage();
+    }ARGEND;
+
+    if(argc == 1)
+        now = strtoul(*argv, 0, 0);
+    else
+        now = time(0);
+
+    if(n)
+        fmt·print("%ld\n", now);
+    else if(u)
+        fmt·print("%s", asctime(gmtime(now)));
+    else
+        fmt·print("%s", ctime(now));
+
+    exits(nil);
+}
diff --git a/src/cmd/core/rules.mk b/src/cmd/core/rules.mk
new file mode 100644
index 0000000..9c4eb76
--- /dev/null
+++ b/src/cmd/core/rules.mk
@@ -0,0 +1,19 @@
+include share/push.mk
+
+BINS_$(d):=\
+	$(d)/basename\
+	$(d)/cat
+
+include share/paths.mk
+libbase:=\
+	$(OBJ_DIR)/libfmt/libfmt.a\
+	$(OBJ_DIR)/libutf/libutf.a\
+	$(OBJ_DIR)/base/base.a
+
+$(o)/basename: $(d)/basename.c $(libbase)
+	$(COMPLINK)
+
+$(o)/cat: $(d)/cat.c $(libbase)
+	$(COMPLINK)
+
+include share/pop.mk
-- 
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