1 files changed, 227 insertions, 0 deletions
diff --git a/contrib/bc/src/read.c b/contrib/bc/src/read.c
new file mode 100644
index 000000000000..e593b3c2dedd
--- /dev/null
+++ b/contrib/bc/src/read.c
@@ -0,0 +1,227 @@
+/*
+ * *****************************************************************************
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * *****************************************************************************
+ *
+ * Code to handle special I/O for bc.
+ *
+ */
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <signal.h>
+
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <read.h>
+#include <history.h>
+#include <program.h>
+#include <vm.h>
+
+static bool bc_read_binary(const char *buf, size_t size) {
+
+	size_t i;
+
+	for (i = 0; i < size; ++i) {
+		if (BC_ERR(BC_READ_BIN_CHAR(buf[i]))) return true;
+	}
+
+	return false;
+}
+
+bool bc_read_buf(BcVec *vec, char *buf, size_t *buf_len) {
+
+	char *nl;
+
+	if (!*buf_len) return false;
+
+	nl = strchr(buf, '\n');
+
+	if (nl != NULL) {
+
+		size_t nllen = (size_t) ((nl + 1) - buf);
+
+		nllen = *buf_len >= nllen ? nllen : *buf_len;
+
+		bc_vec_npush(vec, nllen, buf);
+		*buf_len -= nllen;
+		memmove(buf, nl + 1, *buf_len + 1);
+
+		return true;
+	}
+
+	bc_vec_npush(vec, *buf_len, buf);
+	*buf_len = 0;
+
+	return false;
+}
+
+BcStatus bc_read_chars(BcVec *vec, const char *prompt) {
+
+	bool done = false;
+
+	assert(vec != NULL && vec->size == sizeof(char));
+
+	BC_SIG_ASSERT_NOT_LOCKED;
+
+	bc_vec_popAll(vec);
+
+#if BC_ENABLE_PROMPT
+	if (BC_USE_PROMPT) {
+		bc_file_puts(&vm.fout, prompt);
+		bc_file_flush(&vm.fout);
+	}
+#endif // BC_ENABLE_PROMPT
+
+	if (bc_read_buf(vec, vm.buf, &vm.buf_len)) {
+		bc_vec_pushByte(vec, '\0');
+		return BC_STATUS_SUCCESS;
+	}
+
+	while (!done) {
+
+		ssize_t r;
+
+		BC_SIG_LOCK;
+
+		r = read(STDIN_FILENO, vm.buf + vm.buf_len,
+		         BC_VM_STDIN_BUF_SIZE - vm.buf_len);
+
+		if (BC_UNLIKELY(r < 0)) {
+
+			if (errno == EINTR) {
+
+				if (vm.status == (sig_atomic_t) BC_STATUS_QUIT) {
+					BC_SIG_UNLOCK;
+					return BC_STATUS_QUIT;
+				}
+
+				assert(vm.sig);
+
+				vm.status = (sig_atomic_t) BC_STATUS_SUCCESS;
+#if BC_ENABLE_PROMPT
+				if (BC_USE_PROMPT) bc_file_puts(&vm.fout, prompt);
+#endif // BC_ENABLE_PROMPT
+				bc_file_flush(&vm.fout);
+
+				BC_SIG_UNLOCK;
+
+				continue;
+			}
+
+			BC_SIG_UNLOCK;
+
+			bc_vm_fatalError(BC_ERR_FATAL_IO_ERR);
+		}
+
+		BC_SIG_UNLOCK;
+
+		if (r == 0) {
+			bc_vec_pushByte(vec, '\0');
+			return BC_STATUS_EOF;
+		}
+
+		vm.buf_len += (size_t) r;
+		vm.buf[vm.buf_len] = '\0';
+
+		done = bc_read_buf(vec, vm.buf, &vm.buf_len);
+	}
+
+	bc_vec_pushByte(vec, '\0');
+
+	return BC_STATUS_SUCCESS;
+}
+
+BcStatus bc_read_line(BcVec *vec, const char *prompt) {
+
+	BcStatus s;
+
+#if BC_ENABLE_HISTORY
+	if (BC_TTY && !vm.history.badTerm)
+		s = bc_history_line(&vm.history, vec, prompt);
+	else s = bc_read_chars(vec, prompt);
+#else // BC_ENABLE_HISTORY
+	s = bc_read_chars(vec, prompt);
+#endif // BC_ENABLE_HISTORY
+
+	if (BC_ERR(bc_read_binary(vec->v, vec->len - 1)))
+		bc_vm_verr(BC_ERR_FATAL_BIN_FILE, bc_program_stdin_name);
+
+	return s;
+}
+
+void bc_read_file(const char *path, char **buf) {
+
+	BcErr e = BC_ERR_FATAL_IO_ERR;
+	size_t size, r;
+	struct stat pstat;
+	int fd;
+
+	BC_SIG_ASSERT_LOCKED;
+
+	assert(path != NULL);
+
+	fd = open(path, O_RDONLY);
+	if (BC_ERR(fd < 0)) bc_vm_verr(BC_ERR_FATAL_FILE_ERR, path);
+	if (BC_ERR(fstat(fd, &pstat) == -1)) goto malloc_err;
+
+	if (BC_ERR(S_ISDIR(pstat.st_mode))) {
+		e = BC_ERR_FATAL_PATH_DIR;
+		goto malloc_err;
+	}
+
+	size = (size_t) pstat.st_size;
+	*buf = bc_vm_malloc(size + 1);
+
+	r = (size_t) read(fd, *buf, size);
+	if (BC_ERR(r != size)) goto read_err;
+
+	(*buf)[size] = '\0';
+
+	if (BC_ERR(bc_read_binary(*buf, size))) {
+		e = BC_ERR_FATAL_BIN_FILE;
+		goto read_err;
+	}
+
+	close(fd);
+
+	return;
+
+read_err:
+	free(*buf);
+malloc_err:
+	close(fd);
+	bc_vm_verr(e, path);
+}