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-
- /**
- ** MODIFIED: 06/12/90 by MBN
- **
- ** As originally written, byacc assumed that pathnames followed UNIX syntax,
- ** which is not appropriate for a truly portable tool. The symbols `os2' and
- ** `vms' have been added to handle file name parsing correctly for those
- ** platforms. Also added the character pathsep that contains the character
- ** used as a pathname separator. Default for both is UNIX-style names.
- **/
-
- /**
- ** MODIFIED: 05/12/90 by MBN
- **
- ** Changed default files names from y.tab.[hc] to y_tab.[hc]. Also changed the
- ** verbose file from y.output to y_out.txt. These file names are more portable
- ** to other operating systems such as VMS and OS/2. Note the the "y" prefix
- ** can be modified by the command line option -bprefix.
- **/
-
- #include <signal.h>
- #include "defs.h"
-
- char dflag;
- char lflag;
- char tflag;
- char vflag;
-
- char *prefix = "y";
- char *myname = "yacc";
- char *temp_form = "yacc.XXX";
-
- char pathsep = '/';
-
- int lineno;
- int outline;
-
-
- char *action_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 *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_out.txt */
-
- 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);
- }
-
-
- onintr()
- {
- 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 [-dltv] [-b 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 || ++i >= argc) usage();
- prefix = argv[i];
- continue;
-
- case 'd':
- dflag = 1;
- break;
-
- case 'l':
- lflag = 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 '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 = calloc((unsigned) 1, n);
- if (!p) no_space();
- return (p);
- }
-
-
- create_file_names()
- {
- int i, len;
- char *tmpdir;
-
- tmpdir = getenv("TMPDIR");
- #ifdef os2
- if (tmpdir == 0)
- {
- tmpdir = ".";
- pathsep = '\\';
- }
- #else
- #ifdef vms
- if (tmpdir == 0)
- {
- tmpdir = "";
- pathsep = '.';
- }
- #else
- if (tmpdir == 0)
- {
- tmpdir = "/tmp";
- pathsep = '/';
- }
- #endif
- #endif
-
- len = strlen(tmpdir);
- i = len + 13;
- if (len && tmpdir[len-1] != pathsep)
- ++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] != pathsep)
- {
- action_file_name[len] = pathsep;
- text_file_name[len] = pathsep;
- union_file_name[len] = pathsep;
- ++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(prefix);
- if (dflag)
- {
- /* the number 7 below is the size of ".tab.h"; sizeof is not used */
- /* because of a C compiler that thinks sizeof(".tab.h") == 6 */
- defines_file_name = MALLOC(len + 7);
- if (defines_file_name == 0) no_space();
- strcpy(defines_file_name, prefix);
- strcpy(defines_file_name + len, DEFINES_SUFFIX);
- }
-
- output_file_name = MALLOC(len + 7);
- if (output_file_name == 0) no_space();
- strcpy(output_file_name, prefix);
- strcpy(output_file_name + len, OUTPUT_SUFFIX);
-
- if (vflag)
- {
- verbose_file_name = MALLOC(len + 9);
- if (verbose_file_name == 0) no_space();
- strcpy(verbose_file_name, 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);
- }
-
-
- 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*/
- }
-