coreutils

cp: Add POSIX cp

Diffstat

3 files changed, 138 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31d8742..c9c3c12 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,3 @@
-# CMakeLists.txt
-# CMakeLists file for OMKOV coreutils
-
 CMAKE_MINIMUM_REQUIRED(VERSION 3.12)
 PROJECT(coreutils LANGUAGES C)
 
@@ -19,6 +16,7 @@ ADD_EXECUTABLE(basename ${PROJECT_SOURCE_DIR}/src/basename.c)
 ADD_EXECUTABLE(cat      ${PROJECT_SOURCE_DIR}/src/cat.c)
 ADD_EXECUTABLE(chmod    ${PROJECT_SOURCE_DIR}/src/chmod.c)
 ADD_EXECUTABLE(cksum    ${PROJECT_SOURCE_DIR}/src/cksum.c)
+ADD_EXECUTABLE(cp       ${PROJECT_SOURCE_DIR}/src/cp.c)
 ADD_EXECUTABLE(dirname  ${PROJECT_SOURCE_DIR}/src/dirname.c)
 ADD_EXECUTABLE(echo     ${PROJECT_SOURCE_DIR}/src/echo.c)
 ADD_EXECUTABLE(env      ${PROJECT_SOURCE_DIR}/src/env.c)
diff --git a/README.md b/README.md
index 3d60fd1..055f54a 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ UNIX-like systems.
 | cat              | Concatenate and print files              | POSIX    |
 | chmod            | Change the file modes                    | POSIX    |
 | cksum            | Write file checksums and sizes           | POSIX    |
+| cp               | Copy files                               | POSIX    |
 | dirname          | Return the directory portion of a path   | POSIX    |
 | echo             | Write arguments to standard output       | POSIX    |
 | env              | Execute with an altered enviroment       | POSIX    |
diff --git a/src/cp.c b/src/cp.c
new file mode 100644
index 0000000..15d877b
--- /dev/null
+++ b/src/cp.c
@@ -0,0 +1,136 @@
+// cp.c, version 0.0.1
+// OMKOV coreutils implementation of POSIX cksum
+// Copyright (C) 2021, Jakob Wakeling
+// All rights reserved.
+
+/*
+OMKOV Permissive Licence, version 1.0
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal with
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimers.
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimers in the documentation and/or
+  other materials provided with the distribution.
+* Neither the names of the copyright holders, nor the names of its contributors
+  may be used to endorse or promote products derived from this Software without
+  specific prior written permission.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT
+HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
+*/
+
+#include "lib/error.h"
+#include "lib/optget.h"
+
+#include <sys/stat.h>
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define VERSION "0.0.1"
+
+static struct lop lops[] = {
+	{ "help",    ARG_NUL, 256 },
+	{ "version", ARG_NUL, 257 },
+	{ NULL, 0, 0 }
+};
+
+static bool fflag, Hflag, iflag, Lflag, Pflag, pflag, Rflag;
+
+static inline void cp(const char *src, const char *dst);
+static inline bool fsame(FILE *f1, FILE *f2);
+
+static void hlp(void);
+static void ver(void);
+
+int main(int ac, char *av[]) { A0 = av[0];
+	struct opt opt = OPTGET_INIT; opt.str = "fHiLPpR"; opt.lops = lops;
+	for (int o; (o = optget(&opt, av, 1)) != -1;) switch (o) {
+	case 'f': { fflag = true; break; }
+	case 'H': { Hflag = true; break; }
+	case 'i': { iflag = true; break; }
+	case 'L': { Lflag = true; break; }
+	case 'P': { Pflag = true; break; }
+	case 'p': { pflag = true; break; }
+	case 'R': { Rflag = true; break; }
+	case 256: { hlp(); return 0; }
+	case 257: { ver(); return 0; }
+	default: { return 1; }
+	}
+	
+	if (opt.ind == ac) { error(1, "missing source operand"); }
+	else if (opt.ind == ac - 1) { error(1, "missing destination operand"); }
+	else { cp(av[opt.ind], av[opt.ind + 1]); }
+	
+	return warned;
+}
+
+/* Copy a file to a specified destination */
+static inline void cp(const char *src, const char *dst) {
+	uint8_t b[BUFSIZ * 16]; FILE *fi = NULL, *fo = NULL; struct stat st;
+	
+	if (!(fi = fopen(src, "rb"))) { warn("%s: %s", src, serr()); goto end; }
+	if (!(fo = fopen(dst, "wb"))) { warn("%s: %s", dst, serr()); goto end; }
+	
+	if (fsame(fi, fo)) { warn("%s, %s: same file", src, dst); goto end; }
+	
+	for (register size_t c; (c = fread(b, 1, sizeof (b), fi));) {
+		if (fwrite(b, 1, c, fo) != c) { warn("%s: %s", dst, serr()); goto end; }
+	}
+	
+	// Copy permissions from src to destination
+	if (stat(src, &st)) { warn("%s: %s", src, serr()); goto end; }
+	if (chmod(dst, st.st_mode)) { warn("%s: %s", dst, serr()); goto end; }
+	
+end:;
+	if (fi && fclose(fi)) { warn("%s: %s", src, serr()); }
+	if (fo && fclose(fo)) { warn("%s: %s", dst, serr()); }
+	return;
+}
+
+/* Check if two FILEs point to the same file */
+static inline bool fsame(FILE *f1, FILE *f2) {
+	struct stat s1, s2; fstat(fileno(f1), &s1); fstat(fileno(f2), &s2);
+	return (s1.st_dev == s2.st_dev) && (s1.st_ino == s2.st_ino);
+}
+
+/* Print help information */
+static void hlp(void) {
+	puts("cp - Copy files");
+	puts("\nUsage:");
+	puts("  cp [-Pfip] source destination");
+	puts("  cp [-Pfip] source... destination");
+	puts("  cp -R [-H|-L|-P] [-fip] source... destination");
+	puts("\nOptions:");
+	puts("  -f         UNIMPLEMENTED");
+	puts("  -H         UNIMPLEMENTED");
+	puts("  -i         UNIMPLEMENTED");
+	puts("  -L         UNIMPLEMENTED");
+	puts("  -P         UNIMPLEMENTED");
+	puts("  -p         UNIMPLEMENTED");
+	puts("  -R         UNIMPLEMENTED");
+	puts("  --help     Display help information");
+	puts("  --version  Display version information");
+	return;
+}
+
+/* Print version information */
+static void ver(void) {
+	puts("OMKOV coreutils cp, version " VERSION);
+	puts("Copyright (C) 2021, Jakob Wakeling");
+	puts("All rights reserved.");
+	puts("OMKOV Permissive Licence (https://www.omkov.net/OLPE)");
+	return;
+}