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Atari Mega Archive 1
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gawk213s.zoo
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gawk-src-2.13
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main.c
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1991-07-21
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/*
* main.c -- Expression tree constructors and main program for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming Language.
*
* GAWK 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; either version 1, or (at your option)
* any later version.
*
* GAWK 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "awk.h"
#include "patchlevel.h"
static void usage P((void));
static void copyleft P((void));
static void cmdline_fs P((char *str));
static void init_args P((int argc0, int argc, char *argv0, char **argv));
static void init_vars P((void));
static void pre_assign P((char *v));
SIGTYPE catchsig P((int sig, int code));
static void gawk_option P((char *optstr));
static void nostalgia P((void));
/* These nodes store all the special variables AWK uses */
NODE *FS_node, *NF_node, *RS_node, *NR_node;
NODE *FILENAME_node, *OFS_node, *ORS_node, *OFMT_node;
NODE *CONVFMT_node;
NODE *FNR_node, *RLENGTH_node, *RSTART_node, *SUBSEP_node;
NODE *ENVIRON_node, *IGNORECASE_node;
NODE *ARGC_node, *ARGV_node;
NODE *FIELDWIDTHS_node;
int NF;
int NR;
int FNR;
int IGNORECASE;
char *FS;
char *RS;
char *OFS;
char *ORS;
char *OFMT;
char *CONVFMT;
/*
* The parse tree and field nodes are stored here. Parse_end is a dummy item
* used to free up unneeded fields without freeing the program being run
*/
int errcount = 0; /* error counter, used by yyerror() */
/* The global null string */
NODE *Nnull_string;
/* The name the program was invoked under, for error messages */
const char *myname;
/* A block of AWK code to be run before running the program */
NODE *begin_block = 0;
/* A block of AWK code to be run after the last input file */
NODE *end_block = 0;
int exiting = 0; /* Was an "exit" statement executed? */
int exit_val = 0; /* optional exit value */
#if defined(YYDEBUG) || defined(DEBUG)
extern int yydebug;
#endif
char **srcfiles = NULL; /* source file name(s) */
int numfiles = -1; /* how many source files */
char *cmdline_src = NULL; /* if prog is on command line */
int strict = 0; /* turn off gnu extensions */
int do_posix = 0; /* turn off gnu extensions and \x */
int do_lint = 0; /* provide warnings about questionable stuff */
int output_is_tty = 0; /* control flushing of output */
extern char *version_string; /* current version, for printing */
NODE *expression_value;
/*
* for strict to work, legal options must be first
*
* Unfortunately, -a and -e are orthogonal to -c.
*
* Note that after 2.13, c,a,e,C,D, and V go away.
*/
#ifdef DEBUG
char awk_opts[] = "F:f:v:W:caeCVD";
#else
char awk_opts[] = "F:f:v:W:caeCV";
#endif
int
main(argc, argv)
int argc;
char **argv;
{
int c;
extern int optind;
extern char *optarg;
int i;
int do_nostalgia;
int regex_mode = RE_SYNTAX_AWK;
(void) signal(SIGFPE, (SIGTYPE (*) P((int))) catchsig);
(void) signal(SIGSEGV, (SIGTYPE (*) P((int))) catchsig);
#ifdef VMS
(void) signal(SIGBUS, (SIGTYPE (*) P((int))) catchsig);
#endif
#ifndef VMS
myname = basename(argv[0]);
#else /* VMS */
myname = strdup(basename(argv[0]));
argv[0] = (char *) myname; /* strip path [prior to getopt()] */
vms_arg_fixup(&argc, &argv); /* emulate redirection, expand wildcards */
#endif
if (argc < 2)
usage();
/* remove sccs gunk */
if (strncmp(version_string, "@(#)", 4) == 0)
version_string += 4;
/* initialize the null string */
Nnull_string = make_string("", 0);
Nnull_string->numbr = 0.0;
Nnull_string->type = Node_val;
Nnull_string->flags = (PERM|STR|STRING|NUM|NUMERIC|NUMBER);
/* Set up the special variables */
/*
* Note that this must be done BEFORE arg parsing else -F
* breaks horribly
*/
init_vars();
/* worst case */
emalloc(srcfiles, char **, argc * sizeof(char *), "main");
srcfiles[0] = NULL;
/* undocumented feature, inspired by nostalgia, and a T-shirt */
do_nostalgia = 0;
for (i = 1; i < argc && argv[i][0] == '-'; i++) {
if (argv[i][1] == '-') /* -- */
break;
else if (argv[i][1] == 'c') { /* compat not in next release */
do_nostalgia = 0;
break;
} else if (STREQ(&argv[i][1], "nostalgia"))
do_nostalgia = 1;
/* keep looping, in case -c after -nostalgia */
}
if (do_nostalgia) {
fprintf(stderr, "%s, %s\n",
"warning: option -nostalgia will go away in the next release",
"use -W nostalgia");
nostalgia();
/* NOTREACHED */
}
while ((c = getopt (argc, argv, awk_opts)) != EOF) {
switch (c) {
#ifdef DEBUG
case 'D':
fprintf(stderr,
"warning: option -D will go away in the next release, use -W parsedebug\n");
gawk_option("parsedebug");
break;
#endif
case 'c':
fprintf(stderr,
"warning: option -c will go away in the next release, use -W compat\n");
gawk_option("compat");
break;
case 'F':
cmdline_fs(optarg);
break;
case 'f':
/*
* a la MKS awk, allow multiple -f options.
* this makes function libraries real easy.
* most of the magic is in the scanner.
*/
srcfiles[++numfiles] = optarg;
break;
case 'v':
pre_assign(optarg);
break;
case 'V':
warning(
"option -V will go away in the next release, use -W version");
gawk_option("version");
break;
case 'C':
warning(
"option -C will go away in the next release, use -W copyright");
gawk_option("copyright");
break;
case 'a': /* use old fashioned awk regexps */
warning("option -a will go away in the next release");
/*regex_mode = RE_SYNTAX_AWK;*/
break;
case 'e': /* use Posix style regexps */
warning("option -e will go away in the next release");
/*regex_mode = RE_SYNTAX_POSIX_AWK;*/
break;
case 'W': /* gawk specific options */
gawk_option(optarg);
break;
case '?':
default:
/* getopt will print a message for us */
/* S5R4 awk ignores bad options and keeps going */
break;
}
}
/* Tell the regex routines how they should work. . . */
(void) re_set_syntax(regex_mode);
regsyntax(regex_mode, 0);
#ifdef DEBUG
setbuf(stdout, (char *) NULL); /* make debugging easier */
#endif
if (isatty(fileno(stdout)))
output_is_tty = 1;
/* No -f option, use next arg */
/* write to temp file and save sourcefile name */
if (numfiles == -1) {
if (optind > argc - 1) /* no args left */
usage();
cmdline_src = argv[optind];
optind++;
}
srcfiles[++numfiles] = NULL;
init_args(optind, argc, (char *) myname, argv);
(void) tokexpand();
/* Read in the program */
if (yyparse() || errcount)
exit(1);
/* Set up the field variables */
init_fields();
if (begin_block)
(void) interpret(begin_block);
if (!exiting && (expression_value || end_block))
do_input();
if (end_block)
(void) interpret(end_block);
if (close_io() != 0 && exit_val == 0)
exit_val = 1;
exit(exit_val); /* more portable */
return exit_val; /* to suppress warnings */
}
static void
usage()
{
char *opt1 = " -f progfile [--]";
char *opt2 = " [--] 'program'";
char *regops = " [-F fs] [-v var=val] [-W gawk-opts]";
fprintf(stderr, "usage: %s%s%s file ...\n %s%s%s file ...\n",
myname, regops, opt1, myname, regops, opt2);
exit(11);
}
Regexp *
mk_re_parse(s, ignorecase)
char *s;
int ignorecase;
{
char *src;
register char *dest;
register int c;
int in_brack = 0;
for (dest = src = s; *src != '\0';) {
if (*src == '\\') {
c = *++src;
switch (c) {
case '/':
case 'a':
case 'b':
case 'f':
case 'n':
case 'r':
case 't':
case 'v':
case 'x':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
c = parse_escape(&src);
if (c < 0)
cant_happen();
*dest++ = (char)c;