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+/*****************************************************************************\
+ * input_file.c
+ * $Id: input_file.c,v 1.3 2006/01/24 00:25:40 dsp_llnl Exp $
+ *****************************************************************************
+ * Copyright (C) 2002-2005 The Regents of the University of California.
+ * Produced at the Lawrence Livermore National Laboratory.
+ * Written by David S. Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
+ * UCRL-CODE-2003-012
+ * All rights reserved.
+ *
+ * This file is part of lxbios, a utility for reading/writing LinuxBIOS
+ * parameters and displaying information from the LinuxBIOS table.
+ * For details, see <http://www.llnl.gov/linux/lxbios/>.
+ *
+ * Please also read the file DISCLAIMER which is included in this software
+ * distribution.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License (as published by the
+ * Free Software Foundation) version 2, dated June 1991.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+ * conditions of the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+\*****************************************************************************/
+
+#include "common.h"
+#include "input_file.h"
+#include "layout.h"
+#include "cmos_ops.h"
+#include "cmos_lowlevel.h"
+#include "reg_expr.h"
+
+static int get_input_file_line (FILE *f, char line[], int line_buf_size);
+static unsigned long long try_prepare_cmos_write (const cmos_entry_t *e,
+ const char value_str[]);
+
+/* matches either a blank line or a comment line */
+static const char blank_or_comment_regex[] =
+ /* a blank line */
+ "(^[[:space:]]+$)"
+
+ "|" /* or ... */
+
+ /* a line consisting of: optional whitespace followed by */
+ "(^[[:space:]]*"
+ /* a '#' character and optionally, additional characters */
+ "#.*$)";
+
+/* matches an assignment line */
+const char assignment_regex[] =
+ /* optional whitespace */
+ "^[[:space:]]*"
+ /* followed by a LinuxBIOS parameter name */
+ "([^[:space:]]+)"
+ /* followed by optional whitespace */
+ "[[:space:]]*"
+ /* followed by an '=' character */
+ "="
+ /* followed by optional whitespace */
+ "[[:space:]]*"
+ /* followed by a value that may contain embedded whitespace */
+ "([^[:space:]]+([[:space:]]+[^[:space:]]+)*)+"
+ /* followed by optional whitespace */
+ "[[:space:]]*$";
+
+static int line_num;
+
+/****************************************************************************
+ * process_input_file
+ *
+ * Read the contents of file 'f' and return a pointer to a list of pending
+ * write operations. Perform sanity checking on all write operations and
+ * exit with an error message if there is a problem.
+ ****************************************************************************/
+cmos_write_t * process_input_file (FILE *f)
+ {
+ static const int LINE_BUF_SIZE = 256;
+ static const size_t N_MATCHES = 4;
+ char line[LINE_BUF_SIZE];
+ const char *name, *value;
+ cmos_write_t *list, *item, **p;
+ regex_t blank_or_comment, assignment;
+ regmatch_t match[N_MATCHES];
+ const cmos_entry_t *e;
+
+ list = NULL;
+ p = &list;
+
+ compile_reg_exprs(REG_EXTENDED | REG_NEWLINE, 2, blank_or_comment_regex,
+ &blank_or_comment, assignment_regex, &assignment);
+
+ /* each iteration processes one line from input file */
+ for (line_num = 1;
+ get_input_file_line(f, line, LINE_BUF_SIZE) == OK;
+ line_num++)
+ { /* skip comments and blank lines */
+ if (!regexec(&blank_or_comment, line, 0, NULL, 0))
+ continue;
+
+ /* Is this a valid assignment line? If not, then it's a syntax
+ * error.
+ */
+ if (regexec(&assignment, line, N_MATCHES, match, 0))
+ { fprintf(stderr, "%s: Syntax error on line %d of input file.\n",
+ prog_name, line_num);
+ exit(1);
+ }
+
+ /* OK, we found an assignment. Break the line into substrings
+ * representing the lefthand and righthand sides of the assignment.
+ */
+ line[match[1].rm_eo] = '\0';
+ line[match[2].rm_eo] = '\0';
+ name = &line[match[1].rm_so];
+ value = &line[match[2].rm_so];
+
+ /* now look up the LinuxBIOS parameter name */
+ if (is_checksum_name(name) || (e = find_cmos_entry(name)) == NULL)
+ { fprintf(stderr, "%s: Error on line %d of input file: CMOS parameter "
+ "%s not found.\n", prog_name, line_num, name);
+ exit(1);
+ }
+
+ /* At this point, we figure out what numeric value needs to be written
+ * to which location. At the same time, we perform sanity checking on
+ * the write operation.
+ */
+
+ if ((item = (cmos_write_t *) malloc(sizeof(*item))) == NULL)
+ out_of_memory();
+
+ item->bit = e->bit;
+ item->length = e->length;
+ item->value = try_prepare_cmos_write(e, value);
+
+ /* Append write operation to pending write list. */
+ item->next = NULL;
+ *p = item;
+ p = &item->next;
+ }
+
+ free_reg_exprs(2, &blank_or_comment, &assignment);
+ return list;
+ }
+
+/****************************************************************************
+ * do_cmos_writes
+ *
+ * 'list' is a linked list of pending CMOS write operations that have passed
+ * all sanity checks. Perform all write operations, destroying the list as
+ * we go.
+ ****************************************************************************/
+void do_cmos_writes (cmos_write_t *list)
+ { cmos_write_t *item;
+
+ set_iopl(3);
+
+ while (list != NULL)
+ { item = list;
+ list = item->next;
+ cmos_write(item->bit, item->length, item->value);
+ free(item);
+ }
+
+ cmos_checksum_write(cmos_checksum_compute());
+ set_iopl(0);
+ }
+
+/****************************************************************************
+ * get_input_file_line
+ *
+ * Get a line of input from file 'f'. Store result in 'line' which is an
+ * array of 'line_buf_size' bytes. Return OK on success or an error code on
+ * error.
+ ****************************************************************************/
+static int get_input_file_line (FILE *f, char line[], int line_buf_size)
+ { switch (get_line_from_file(f, line, line_buf_size))
+ { case OK:
+ return OK;
+
+ case LINE_EOF:
+ return LINE_EOF;
+
+ case LINE_TOO_LONG:
+ fprintf(stderr, "%s: Error on line %d of input file: Maximum line "
+ "length exceeded. Max is %d characters.\n", prog_name,
+ line_num, line_buf_size - 2);
+ break;
+
+ default:
+ BUG();
+ }
+
+ exit(1);
+ return 1; /* keep compiler happy */
+ }
+
+/****************************************************************************
+ * try_prepare_cmos_write
+ *
+ * Attempt to convert 'value_str' to an integer representation for storage in
+ * CMOS memory. On success, return the converted value. On error, exit with
+ * an error message.
+ ****************************************************************************/
+static unsigned long long try_prepare_cmos_write (const cmos_entry_t *e,
+ const char value_str[])
+ { unsigned long long value;
+
+ switch (prepare_cmos_write(e, value_str, &value))
+ { case OK:
+ return value;
+
+ case CMOS_OP_BAD_ENUM_VALUE:
+ fprintf(stderr, "%s: Error on line %d of input file: Bad value for "
+ "parameter %s.", prog_name, line_num, e->name);
+ break;
+
+ case CMOS_OP_NEGATIVE_INT:
+ fprintf(stderr, "%s: Error on line %d of input file: This program "
+ "does not support assignment of negative numbers to "
+ "LinuxBIOS parameters.", prog_name, line_num);
+ break;
+
+ case CMOS_OP_INVALID_INT:
+ fprintf(stderr, "%s: Error on line %d of input file: %s is not a "
+ "valid integer.", prog_name, line_num, value_str);
+ break;
+
+ case CMOS_OP_RESERVED:
+ fprintf(stderr, "%s: Error on line %d of input file: Can not modify "
+ "reserved LinuxBIOS parameter %s.", prog_name, line_num,
+ e->name);
+ break;
+
+ case CMOS_OP_VALUE_TOO_WIDE:
+ fprintf(stderr, "%s: Error on line %d of input file: Can not write "
+ "value %s to CMOS parameter %s that is only %d bits wide.",
+ prog_name, line_num, value_str, e->name, e->length);
+ break;
+
+ case CMOS_OP_NO_MATCHING_ENUM:
+ fprintf(stderr, "%s: LinuxBIOS parameter %s has no matching enums.",
+ prog_name, e->name);
+ break;
+
+ case CMOS_AREA_OUT_OF_RANGE:
+ fprintf(stderr, "%s: The CMOS area specified by the layout info for "
+ "LinuxBIOS parameter %s is out of range.", prog_name,
+ e->name);
+ break;
+
+ case CMOS_AREA_OVERLAPS_RTC:
+ fprintf(stderr, "%s: The CMOS area specified by the layout info for "
+ "LinuxBIOS parameter %s overlaps the realtime clock area.",
+ prog_name, e->name);
+ break;
+
+ case CMOS_AREA_TOO_WIDE:
+ fprintf(stderr, "%s: The CMOS area specified by the layout info for "
+ "LinuxBIOS parameter %s is too wide.",
+ prog_name, e->name);
+ break;
+
+ default:
+ fprintf(stderr,
+ "%s: Unknown error encountered while attempting to modify "
+ "LinuxBIOS parameter %s.", prog_name, e->name);
+ break;
+ }
+
+ fprintf(stderr, " No CMOS writes performed.\n");
+ exit(1);
+ return 0; /* keep compiler happy */
+ }