Minix2.0/src/commands/byacc/main.c
#include <sys/types.h>
#include <signal.h>
#include "defs.h"
char dflag;
char lflag;
char rflag;
char tflag;
char vflag;
char *symbol_prefix;
char *file_prefix = "y";
char *myname = "yacc";
char *temp_form = "yacc.XXXXXXX";
int lineno;
int outline;
char *action_file_name;
char *code_file_name;
char *defines_file_name;
char *input_file_name = "";
char *output_file_name;
char *text_file_name;
char *union_file_name;
char *verbose_file_name;
FILE *action_file; /* a temp file, used to save actions associated */
/* with rules until the parser is written */
FILE *code_file; /* y.code.c (used when the -r option is specified) */
FILE *defines_file; /* y.tab.h */
FILE *input_file; /* the input file */
FILE *output_file; /* y.tab.c */
FILE *text_file; /* a temp file, used to save text until all */
/* symbols have been defined */
FILE *union_file; /* a temp file, used to save the union */
/* definition until all symbol have been */
/* defined */
FILE *verbose_file; /* y.output */
int nitems;
int nrules;
int nsyms;
int ntokens;
int nvars;
int start_symbol;
char **symbol_name;
short *symbol_value;
short *symbol_prec;
char *symbol_assoc;
short *ritem;
short *rlhs;
short *rrhs;
short *rprec;
char *rassoc;
short **derives;
char *nullable;
extern char *mktemp();
extern char *getenv();
done(k)
int k;
{
if (action_file) { fclose(action_file); unlink(action_file_name); }
if (text_file) { fclose(text_file); unlink(text_file_name); }
if (union_file) { fclose(union_file); unlink(union_file_name); }
exit(k);
}
void
onintr(signo)
int signo;
{
done(1);
}
set_signals()
{
#ifdef SIGINT
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
#endif
#ifdef SIGTERM
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, onintr);
#endif
#ifdef SIGHUP
if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
signal(SIGHUP, onintr);
#endif
}
usage()
{
fprintf(stderr, "usage: %s [-dlrtv] [-b file_prefix] [-p symbol_prefix] filename\n", myname);
exit(1);
}
getargs(argc, argv)
int argc;
char *argv[];
{
register int i;
register char *s;
if (argc > 0) myname = argv[0];
for (i = 1; i < argc; ++i)
{
s = argv[i];
if (*s != '-') break;
switch (*++s)
{
case '\0':
input_file = stdin;
if (i + 1 < argc) usage();
return;
case '-':
++i;
goto no_more_options;
case 'b':
if (*++s)
file_prefix = s;
else if (++i < argc)
file_prefix = argv[i];
else
usage();
continue;
case 'd':
dflag = 1;
break;
case 'l':
lflag = 1;
break;
case 'p':
if (*++s)
symbol_prefix = s;
else if (++i < argc)
symbol_prefix = argv[i];
else
usage();
continue;
case 'r':
rflag = 1;
break;
case 't':
tflag = 1;
break;
case 'v':
vflag = 1;
break;
default:
usage();
}
for (;;)
{
switch (*++s)
{
case '\0':
goto end_of_option;
case 'd':
dflag = 1;
break;
case 'l':
lflag = 1;
break;
case 'r':
rflag = 1;
break;
case 't':
tflag = 1;
break;
case 'v':
vflag = 1;
break;
default:
usage();
}
}
end_of_option:;
}
no_more_options:;
if (i + 1 != argc) usage();
input_file_name = argv[i];
}
char *
allocate(n)
unsigned n;
{
register char *p;
p = NULL;
if (n)
{
p = CALLOC(1, n);
if (!p) no_space();
}
return (p);
}
create_file_names()
{
int i, len;
char *tmpdir;
tmpdir = getenv("TMPDIR");
if (tmpdir == 0) tmpdir = "/tmp";
len = strlen(tmpdir);
i = len + 13;
if (len && tmpdir[len-1] != '/')
++i;
action_file_name = MALLOC(i);
if (action_file_name == 0) no_space();
text_file_name = MALLOC(i);
if (text_file_name == 0) no_space();
union_file_name = MALLOC(i);
if (union_file_name == 0) no_space();
strcpy(action_file_name, tmpdir);
strcpy(text_file_name, tmpdir);
strcpy(union_file_name, tmpdir);
if (len && tmpdir[len - 1] != '/')
{
action_file_name[len] = '/';
text_file_name[len] = '/';
union_file_name[len] = '/';
++len;
}
strcpy(action_file_name + len, temp_form);
strcpy(text_file_name + len, temp_form);
strcpy(union_file_name + len, temp_form);
action_file_name[len + 5] = 'a';
text_file_name[len + 5] = 't';
union_file_name[len + 5] = 'u';
mktemp(action_file_name);
mktemp(text_file_name);
mktemp(union_file_name);
len = strlen(file_prefix);
output_file_name = MALLOC(len + 7);
if (output_file_name == 0)
no_space();
strcpy(output_file_name, file_prefix);
strcpy(output_file_name + len, OUTPUT_SUFFIX);
if (rflag)
{
code_file_name = MALLOC(len + 8);
if (code_file_name == 0)
no_space();
strcpy(code_file_name, file_prefix);
strcpy(code_file_name + len, CODE_SUFFIX);
}
else
code_file_name = output_file_name;
if (dflag)
{
defines_file_name = MALLOC(len + 7);
if (defines_file_name == 0)
no_space();
strcpy(defines_file_name, file_prefix);
strcpy(defines_file_name + len, DEFINES_SUFFIX);
}
if (vflag)
{
verbose_file_name = MALLOC(len + 8);
if (verbose_file_name == 0)
no_space();
strcpy(verbose_file_name, file_prefix);
strcpy(verbose_file_name + len, VERBOSE_SUFFIX);
}
}
open_files()
{
create_file_names();
if (input_file == 0)
{
input_file = fopen(input_file_name, "r");
if (input_file == 0)
open_error(input_file_name);
}
action_file = fopen(action_file_name, "w");
if (action_file == 0)
open_error(action_file_name);
text_file = fopen(text_file_name, "w");
if (text_file == 0)
open_error(text_file_name);
if (vflag)
{
verbose_file = fopen(verbose_file_name, "w");
if (verbose_file == 0)
open_error(verbose_file_name);
}
if (dflag)
{
defines_file = fopen(defines_file_name, "w");
if (defines_file == 0)
open_error(defines_file_name);
union_file = fopen(union_file_name, "w");
if (union_file == 0)
open_error(union_file_name);
}
output_file = fopen(output_file_name, "w");
if (output_file == 0)
open_error(output_file_name);
if (rflag)
{
code_file = fopen(code_file_name, "w");
if (code_file == 0)
open_error(code_file_name);
}
else
code_file = output_file;
}
int
main(argc, argv)
int argc;
char *argv[];
{
set_signals();
getargs(argc, argv);
open_files();
reader();
lr0();
lalr();
make_parser();
verbose();
output();
done(0);
/*NOTREACHED*/
}