/****************************************************************************
* parse_assignment
*
* Parse the string 'arg' (which supposedly represents an assignment) into a
* NAME and a VALUE. If 'arg' does not conform to the proper assignment
* syntax, exit with a usage message. Otherwise, on return, 'arg' is broken
* into substrings representing NAME and VALUE, and *name and *value are set
* to point to these two substrings.
****************************************************************************/
static void parse_assignment(char arg[], const char **name, const char **value)
{
static const size_t N_MATCHES = 4;
regmatch_t match[N_MATCHES];
regex_t assignment;
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, assignment_regex, &assignment);
/* Does 'arg' conform to proper assignment syntax? If not, exit with a
* usage message.
*/
if (regexec(&assignment, arg, N_MATCHES, match, 0))
usage(stderr);
/* Ok, we found a valid assignment. Break it into two strings
* representing NAME and VALUE.
*/
arg[match[1].rm_eo] = '\0';
arg[match[2].rm_eo] = '\0';
*name = &arg[match[1].rm_so];
*value = &arg[match[2].rm_so];
regfree(&assignment);
}
/****************************************************************************
* 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_expr(REG_EXTENDED | REG_NEWLINE, blank_or_comment_regex, &blank_or_comment);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, 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 coreboot 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->config = e->config;
item->value = try_prepare_cmos_write(e, value);
/* Append write operation to pending write list. */
item->next = NULL;
*p = item;
p = &item->next;
}
regfree(&blank_or_comment);
regfree(&assignment);
return list;
}
/****************************************************************************
* process_layout_file
*
* Read CMOS layout information from file 'f' and add it to our internal
* repository.
****************************************************************************/
static void process_layout_file(FILE * f)
{
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, blank_or_comment_regex, &blank_or_comment_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, start_entries_regex, &start_entries_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, entries_line_regex, &entries_line_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, start_enums_regex, &start_enums_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, enums_line_regex, &enums_line_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, start_checksums_regex, &start_checksums_expr);
compile_reg_expr(REG_EXTENDED | REG_NEWLINE, checksum_line_regex, &checksum_line_expr);
line_num = 1;
skip_past_start(f);
/* Skip past all entries. We will process these later when we
* make a second pass through the file.
*/
while (!process_entry(f, 1)) ;
/* Process all enums, adding them to our internal repository as
* we go. */
if (process_enum(f, 0)) {
fprintf(stderr, "%s: Error: CMOS layout file contains no "
"enumerations.\n", prog_name);
exit(1);
}
while (!process_enum(f, 0)) ;
/* Go back to start of file. */
line_num = 1;
fseek(f, 0, SEEK_SET);
skip_past_start(f);
/* Process all entries, adding them to the repository as we go.
* We must add the entries after the enums, even though they
* appear in the layout file before the enums. This is because
* the entries are sanity checked against the enums as they are
* added.
*/
if (process_entry(f, 0)) {
fprintf(stderr,
"%s: Error: CMOS layout file contains no entries.\n",
prog_name);
exit(1);
}
while (!process_entry(f, 0)) ;
/* Skip past all enums. They have already been processed. */
while (!process_enum(f, 1)) ;
/* Process CMOS checksum info. */
process_checksum_info(f);
/* See if there are any lines left to process. If so, verify
* that they are all either blank lines or comments.
*/
skip_remaining_lines(f);
regfree(&blank_or_comment_expr);
regfree(&start_entries_expr);
regfree(&entries_line_expr);
regfree(&start_enums_expr);
regfree(&enums_line_expr);
regfree(&start_checksums_expr);
regfree(&checksum_line_expr);
}