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freebsd-skq/contrib/awk/main.c
sheldonh ead30e8323 Merge the vendor release of gawk-3.0.6 onto HEAD. 
This addresses one known problem in the PR database.

PR:		13921
Reported by:	Jin Guojun <j_guojun@lbl.gov>
2000-08-15 10:20:01 +00:00

748 lines
20 KiB
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/*
* main.c -- Expression tree constructors and main program for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2000 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming 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 2 of the License, 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* $FreeBSD$
*/
#include "awk.h"
#include "getopt.h"
#include "patchlevel.h"
static void usage P((int exitval, FILE *fp));
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));
RETSIGTYPE catchsig P((int sig, int code));
static void nostalgia P((void));
static void version P((void));
/* These nodes store all the special variables AWK uses */
NODE *ARGC_node, *ARGIND_node, *ARGV_node, *CONVFMT_node, *ENVIRON_node;
NODE *ERRNO_node, *FIELDWIDTHS_node, *FILENAME_node, *FNR_node, *FS_node;
NODE *IGNORECASE_node, *NF_node, *NR_node, *OFMT_node, *OFS_node;
NODE *ORS_node, *RLENGTH_node, *RSTART_node, *RS_node, *RT_node, *SUBSEP_node;
long NF;
long NR;
long FNR;
int IGNORECASE;
char *OFS;
char *ORS;
char *OFMT;
/*
* CONVFMT is a convenience pointer for the current number to string format.
* We must supply an initial value to avoid recursion problems of
* set_CONVFMT -> fmt_index -> r_force_string: gets NULL CONVFMT
* Fun, fun, fun, fun.
*/
char *CONVFMT = "%.6g";
int errcount = 0; /* error counter, used by yyerror() */
NODE *Nnull_string; /* The global null 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 = NULL;
/* A block of AWK code to be run after the last input file */
NODE *end_block = NULL;
int exiting = FALSE; /* Was an "exit" statement executed? */
int exit_val = 0; /* optional exit value */
#if defined(YYDEBUG) || defined(DEBUG)
extern int yydebug;
#endif
struct src *srcfiles = NULL; /* source file name(s) */
long numfiles = -1; /* how many source files */
int do_traditional = FALSE; /* no gnu extensions, add traditional weirdnesses */
int do_posix = FALSE; /* turn off gnu and unix extensions */
int do_lint = FALSE; /* provide warnings about questionable stuff */
int do_lint_old = FALSE; /* warn about stuff not in V7 awk */
int do_nostalgia = FALSE; /* provide a blast from the past */
int do_intervals = FALSE; /* allow {...,...} in regexps */
int in_begin_rule = FALSE; /* we're in a BEGIN rule */
int in_end_rule = FALSE; /* we're in a END rule */
int output_is_tty = FALSE; /* control flushing of output */
extern char *version_string; /* current version, for printing */
/* The parse tree is stored here. */
NODE *expression_value;
static struct option optab[] = {
{ "compat", no_argument, & do_traditional, 1 },
{ "traditional", no_argument, & do_traditional, 1 },
{ "lint", no_argument, & do_lint, 1 },
{ "lint-old", no_argument, & do_lint_old, 1 },
{ "posix", no_argument, & do_posix, 1 },
{ "nostalgia", no_argument, & do_nostalgia, 1 },
{ "copyleft", no_argument, NULL, 'C' },
{ "copyright", no_argument, NULL, 'C' },
{ "field-separator", required_argument, NULL, 'F' },
{ "file", required_argument, NULL, 'f' },
{ "re-interval", no_argument, & do_intervals, 1 },
{ "source", required_argument, NULL, 's' },
{ "assign", required_argument, NULL, 'v' },
{ "version", no_argument, NULL, 'V' },
{ "usage", no_argument, NULL, 'u' },
{ "help", no_argument, NULL, 'u' },
#ifdef DEBUG
{ "parsedebug", no_argument, NULL, 'D' },
#endif
{ NULL, 0, NULL, '\0' }
};
/* main --- process args, parse program, run it, clean up */
int
main(argc, argv)
int argc;
char **argv;
{
int c;
char *scan;
/* the + on the front tells GNU getopt not to rearrange argv */
const char *optlist = "+F:f:v:W;m:";
int stopped_early = FALSE;
int old_optind;
extern int optind;
extern int opterr;
extern char *optarg;
setlocale(LC_CTYPE, "");
setlocale(LC_COLLATE, "");
(void) signal(SIGFPE, (RETSIGTYPE (*) P((int))) catchsig);
(void) signal(SIGSEGV, (RETSIGTYPE (*) P((int))) catchsig);
#ifdef SIGBUS
(void) signal(SIGBUS, (RETSIGTYPE (*) P((int))) catchsig);
#endif
myname = gawk_name(argv[0]);
argv[0] = (char *) myname;
os_arg_fixup(&argc, &argv); /* emulate redirection, expand wildcards */
/* remove sccs gunk */
if (strncmp(version_string, "@(#)", 4) == 0)
version_string += 4;
if (argc < 2)
usage(1, stderr);
/* 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|NUMBER);
/*
* Tell the regex routines how they should work.
* Do this before initializing variables, since
* they could want to do a regexp compile.
*/
resetup();
/* Set up the special variables */
/*
* Note that this must be done BEFORE arg parsing else -F
* breaks horribly.
*/
init_vars();
/* Set up the field variables */
/*
* Do this before arg parsing so that `-v NF=blah' won't
* break anything.
*/
init_fields();
/* worst case */
emalloc(srcfiles, struct src *, argc * sizeof(struct src), "main");
memset(srcfiles, '\0', argc * sizeof(struct src));
/* we do error messages ourselves on invalid options */
opterr = FALSE;
/* option processing. ready, set, go! */
for (optopt = 0, old_optind = 1;
(c = getopt_long(argc, argv, optlist, optab, NULL)) != EOF;
optopt = 0, old_optind = optind) {
if (do_posix)
opterr = TRUE;
switch (c) {
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.
*
* The following is to allow for whitespace at the end
* of a #! /bin/gawk line in an executable file
*/
scan = optarg;
while (ISSPACE(*scan))
scan++;
++numfiles;
srcfiles[numfiles].stype = SOURCEFILE;
if (*scan == '\0')
srcfiles[numfiles].val = argv[optind++];
else
srcfiles[numfiles].val = optarg;
break;
case 'v':
pre_assign(optarg);
break;
case 'm':
/*
* Research awk extension.
* -mf nnn set # fields, gawk ignores
* -mr nnn set record length, ditto
*/
if (do_lint)
warning("-m[fr] option irrelevant in gawk");
if (optarg[0] != 'r' && optarg[0] != 'f')
warning("-m option usage: `-m[fr] nnn'");
if (optarg[1] == '\0')
optind++;
break;
case 'W': /* gawk specific options - now in getopt_long */
fprintf(stderr, "%s: option `-W %s' unrecognized, ignored\n",
argv[0], optarg);
break;
/* These can only come from long form options */
case 'C':
copyleft();
break;
case 's':
if (optarg[0] == '\0')
warning("empty argument to --source ignored");
else {
srcfiles[++numfiles].stype = CMDLINE;
srcfiles[numfiles].val = optarg;
}
break;
case 'u':
usage(0, stdout); /* per coding stds */
break;
case 'V':
version();
break;
#ifdef DEBUG
case 'D':
yydebug = 2;
break;
#endif
case 0:
/*
* getopt_long found an option that sets a variable
* instead of returning a letter. Do nothing, just
* cycle around for the next one.
*/
break;
case '?':
default:
/*
* New behavior. If not posix, an unrecognized
* option stops argument processing so that it can
* go into ARGV for the awk program to see. This
* makes use of ``#! /bin/gawk -f'' easier.
*
* However, it's never simple. If optopt is set,
* an option that requires an argument didn't get the
* argument. We care because if opterr is 0, then
* getopt_long won't print the error message for us.
*/
if (! do_posix
&& (optopt == '\0' || strchr(optlist, optopt) == NULL)) {
/*
* can't just do optind--. In case of an
* option with >= 2 letters, getopt_long
* won't have incremented optind.
*/
optind = old_optind;
stopped_early = TRUE;
goto out;
} else if (optopt != '\0')
/* Use 1003.2 required message format */
fprintf(stderr,
"%s: option requires an argument -- %c\n",
myname, optopt);
/* else
let getopt print error message for us */
break;
}
}
out:
if (do_nostalgia)
nostalgia();
/* check for POSIXLY_CORRECT environment variable */
if (! do_posix && getenv("POSIXLY_CORRECT") != NULL) {
do_posix = TRUE;
if (do_lint)
warning(
"environment variable `POSIXLY_CORRECT' set: turning on --posix");
}
if (do_posix) {
if (do_traditional) /* both on command line */
warning("--posix overrides --traditional");
else
do_traditional = TRUE;
/*
* POSIX compliance also implies
* no GNU extensions either.
*/
}
/*
* Tell the regex routines how they should work.
* Do this again, after argument processing, since do_posix
* and do_traditional are now paid attention to by resetup().
*/
if (do_traditional || do_posix || do_intervals) {
resetup();
/* now handle RS and FS. have to be careful with FS */
set_RS();
if (using_fieldwidths()) {
set_FS();
set_FIELDWIDTHS();
} else
set_FS();
}
#ifdef DEBUG
setbuf(stdout, (char *) NULL); /* make debugging easier */
#endif
if (isatty(fileno(stdout)))
output_is_tty = TRUE;
/* No -f or --source options, use next arg */
if (numfiles == -1) {
if (optind > argc - 1 || stopped_early) /* no args left or no program */
usage(1, stderr);
srcfiles[++numfiles].stype = CMDLINE;
srcfiles[numfiles].val = argv[optind];
optind++;
}
init_args(optind, argc, (char *) myname, argv);
(void) tokexpand();
/* Read in the program */
if (yyparse() != 0 || errcount != 0)
exit(1);
/* recover any space from C based alloca */
#ifdef C_ALLOCA
(void) alloca(0);
#endif
if (do_lint && begin_block == NULL && expression_value == NULL
&& end_block == NULL)
warning("no program");
if (begin_block != NULL) {
in_begin_rule = TRUE;
(void) interpret(begin_block);
}
in_begin_rule = FALSE;
if (! exiting && (expression_value != NULL || end_block != NULL))
do_input();
if (end_block != NULL) {
in_end_rule = TRUE;
(void) interpret(end_block);
}
in_end_rule = FALSE;
if (close_io() != 0 && exit_val == 0)
exit_val = 1;
exit(exit_val); /* more portable */
return exit_val; /* to suppress warnings */
}
/* usage --- print usage information and exit */
static void
usage(exitval, fp)
int exitval;
FILE *fp;
{
char *opt1 = " -f progfile [--]";
char *regops = " [POSIX or GNU style options]";
fprintf(fp, "Usage: %s%s%s file ...\n\t%s%s [--] %cprogram%c file ...\n",
myname, regops, opt1, myname, regops, quote, quote);
/* GNU long options info. Gack. */
fputs("POSIX options:\t\tGNU long options:\n", fp);
fputs("\t-f progfile\t\t--file=progfile\n", fp);
fputs("\t-F fs\t\t\t--field-separator=fs\n", fp);
fputs("\t-v var=val\t\t--assign=var=val\n", fp);
fputs("\t-m[fr] val\n", fp);
fputs("\t-W compat\t\t--compat\n", fp);
fputs("\t-W copyleft\t\t--copyleft\n", fp);
fputs("\t-W copyright\t\t--copyright\n", fp);
fputs("\t-W help\t\t\t--help\n", fp);
fputs("\t-W lint\t\t\t--lint\n", fp);
fputs("\t-W lint-old\t\t--lint-old\n", fp);
#ifdef NOSTALGIA
fputs("\t-W nostalgia\t\t--nostalgia\n", fp);
#endif
#ifdef DEBUG
fputs("\t-W parsedebug\t\t--parsedebug\n", fp);
#endif
fputs("\t-W posix\t\t--posix\n", fp);
fputs("\t-W re-interval\t\t--re-interval\n", fp);
fputs("\t-W source=program-text\t--source=program-text\n", fp);
fputs("\t-W traditional\t\t--traditional\n", fp);
fputs("\t-W usage\t\t--usage\n", fp);
fputs("\t-W version\t\t--version\n", fp);
fputs("\nTo report bugs, see node `Bugs' in `gawk.info', which\n", fp);
fputs("is section `Reporting Problems and Bugs' in the\n", fp);
fputs("printed version.\n", fp);
exit(exitval);
}
/* copyleft --- print out the short GNU copyright information */
static void
copyleft()
{
static char blurb_part1[] =
"Copyright (C) 1989, 1991-2000 Free Software Foundation.\n\
\n\
This program is free software; you can redistribute it and/or modify\n\
it under the terms of the GNU General Public License as published by\n\
the Free Software Foundation; either version 2 of the License, or\n\
(at your option) any later version.\n\
\n";
static char blurb_part2[] =
"This program is distributed in the hope that it will be useful,\n\
but WITHOUT ANY WARRANTY; without even the implied warranty of\n\
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n\
GNU General Public License for more details.\n\
\n";
static char blurb_part3[] =
"You should have received a copy of the GNU General Public License\n\
along with this program; if not, write to the Free Software\n\
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.\n";
/* multiple blurbs are needed for some brain dead compilers. */
fputs(blurb_part1, stdout);
fputs(blurb_part2, stdout);
fputs(blurb_part3, stdout);
fflush(stdout);
exit(0);
}
/* cmdline_fs --- set FS from the command line */
static void
cmdline_fs(str)
char *str;
{
register NODE **tmp;
tmp = get_lhs(FS_node, (Func_ptr *) 0);
unref(*tmp);
/*
* Only if in full compatibility mode check for the stupid special
* case so -F\t works as documented in awk book even though the shell
* hands us -Ft. Bleah!
*
* Thankfully, Posix didn't propogate this "feature".
*/
if (str[0] == 't' && str[1] == '\0') {
if (do_lint)
warning("-Ft does not set FS to tab in POSIX awk");
if (do_traditional && ! do_posix)
str[0] = '\t';
}
*tmp = make_str_node(str, strlen(str), SCAN); /* do process escapes */
set_FS();
}
/* init_args --- set up ARGV from stuff on the command line */
static void
init_args(argc0, argc, argv0, argv)
int argc0, argc;
char *argv0;
char **argv;
{
int i, j;
NODE **aptr;
ARGV_node = install("ARGV", node(Nnull_string, Node_var_array, (NODE *) NULL));
aptr = assoc_lookup(ARGV_node, tmp_number(0.0));
*aptr = make_string(argv0, strlen(argv0));
(*aptr)->flags |= MAYBE_NUM;
for (i = argc0, j = 1; i < argc; i++) {
aptr = assoc_lookup(ARGV_node, tmp_number((AWKNUM) j));
*aptr = make_string(argv[i], strlen(argv[i]));
(*aptr)->flags |= MAYBE_NUM;
j++;
}
ARGC_node = install("ARGC",
node(make_number((AWKNUM) j), Node_var, (NODE *) NULL));
}
/*
* Set all the special variables to their initial values.
* Note that some of the variables that have set_FOO routines should
* *N*O*T* have those routines called upon initialization, and thus
* they have NULL entries in that field. This is notably true of FS
* and IGNORECASE.
*/
struct varinit {
NODE **spec;
const char *name;
NODETYPE type;
const char *strval;
AWKNUM numval;
Func_ptr assign;
};
static struct varinit varinit[] = {
{&CONVFMT_node, "CONVFMT", Node_CONVFMT, "%.6g", 0, set_CONVFMT },
{&NF_node, "NF", Node_NF, NULL, -1, set_NF },
{&FIELDWIDTHS_node, "FIELDWIDTHS", Node_FIELDWIDTHS, "", 0, NULL },
{&NR_node, "NR", Node_NR, NULL, 0, set_NR },
{&FNR_node, "FNR", Node_FNR, NULL, 0, set_FNR },
{&FS_node, "FS", Node_FS, " ", 0, NULL },
{&RS_node, "RS", Node_RS, "\n", 0, set_RS },
{&IGNORECASE_node, "IGNORECASE", Node_IGNORECASE, NULL, 0, NULL },
{&FILENAME_node, "FILENAME", Node_var, "", 0, NULL },
{&OFS_node, "OFS", Node_OFS, " ", 0, set_OFS },
{&ORS_node, "ORS", Node_ORS, "\n", 0, set_ORS },
{&OFMT_node, "OFMT", Node_OFMT, "%.6g", 0, set_OFMT },
{&RLENGTH_node, "RLENGTH", Node_var, NULL, 0, NULL },
{&RSTART_node, "RSTART", Node_var, NULL, 0, NULL },
{&SUBSEP_node, "SUBSEP", Node_var, "\034", 0, NULL },
{&ARGIND_node, "ARGIND", Node_var, NULL, 0, NULL },
{&ERRNO_node, "ERRNO", Node_var, NULL, 0, NULL },
{&RT_node, "RT", Node_var, "", 0, NULL },
{0, NULL, Node_illegal, NULL, 0, NULL },
};
/* init_vars --- actually initialize everything in the symbol table */
static void
init_vars()
{
register struct varinit *vp;
for (vp = varinit; vp->name; vp++) {
*(vp->spec) = install((char *) vp->name,
node(vp->strval == NULL ? make_number(vp->numval)
: make_string((char *) vp->strval,
strlen(vp->strval)),
vp->type, (NODE *) NULL));
(*(vp->spec))->flags |= SCALAR;
if (vp->assign)
(*(vp->assign))();
}
}
/* load_environ --- populate the ENVIRON array */
void
load_environ()
{
#if ! (defined(MSDOS) && !defined(DJGPP)) && ! defined(OS2) && ! (defined(VMS) && defined(__DECC))
extern char **environ;
#endif
register char *var, *val, *cp;
NODE **aptr;
register int i;
ENVIRON_node = install("ENVIRON",
node(Nnull_string, Node_var, (NODE *) NULL));
for (i = 0; environ[i] != NULL; i++) {
static char nullstr[] = "";
var = environ[i];
val = strchr(var, '=');
if (val != NULL)
*val++ = '\0';
else
val = nullstr;
aptr = assoc_lookup(ENVIRON_node, tmp_string(var, strlen(var)));
*aptr = make_string(val, strlen(val));
(*aptr)->flags |= (MAYBE_NUM|SCALAR);
/* restore '=' so that system() gets a valid environment */
if (val != nullstr)
*--val = '=';
}
/*
* Put AWKPATH into ENVIRON if it's not there.
* This allows querying it from outside gawk.
*/
if ((cp = getenv("AWKPATH")) == NULL) {
aptr = assoc_lookup(ENVIRON_node, tmp_string("AWKPATH", 7));
*aptr = make_string(defpath, strlen(defpath));
(*aptr)->flags |= SCALAR;
}
}
/* arg_assign --- process a command-line assignment */
char *
arg_assign(arg)
char *arg;
{
char *cp, *cp2;
int badvar;
Func_ptr after_assign = NULL;
NODE *var;
NODE *it;
NODE **lhs;
cp = strchr(arg, '=');
if (cp != NULL) {
*cp++ = '\0';
/* first check that the variable name has valid syntax */
badvar = FALSE;
if (! isalpha(arg[0]) && arg[0] != '_')
badvar = TRUE;
else
for (cp2 = arg+1; *cp2; cp2++)
if (! isalnum(*cp2) && *cp2 != '_') {
badvar = TRUE;
break;
}
if (badvar) {
if (do_lint)
warning("illegal name `%s' in variable assignment", arg);
*--cp = '='; /* restore original text of ARGV */
return NULL;
}
/*
* Recent versions of nawk expand escapes inside assignments.
* This makes sense, so we do it too.
*/
it = make_str_node(cp, strlen(cp), SCAN);
it->flags |= (MAYBE_NUM|SCALAR);
var = variable(arg, FALSE, Node_var);
lhs = get_lhs(var, &after_assign);
unref(*lhs);
*lhs = it;
if (after_assign != NULL)
(*after_assign)();
*--cp = '='; /* restore original text of ARGV */
}
return cp;
}
/* pre_assign --- handle -v, print a message and die if a problem */
static void
pre_assign(v)
char *v;
{
if (arg_assign(v) == NULL) {
fprintf(stderr,
"%s: `%s' argument to `-v' not in `var=value' form\n",
myname, v);
usage(1, stderr);
}
}
/* catchsig --- catch signals */
RETSIGTYPE
catchsig(sig, code)
int sig, code;
{
#ifdef lint
code = 0; sig = code; code = sig;
#endif
if (sig == SIGFPE) {
fatal("floating point exception");
} else if (sig == SIGSEGV
#ifdef SIGBUS
|| sig == SIGBUS
#endif
) {
set_loc(__FILE__, __LINE__);
msg("fatal error: internal error");
/* fatal won't abort() if not compiled for debugging */
abort();
} else
cant_happen();
/* NOTREACHED */
}
/* nostalgia --- print the famous error message and die */
static void
nostalgia()
{
fprintf(stderr, "awk: bailing out near line 1\n");
abort();
}
/* version --- print version message */
static void
version()
{
printf("%s.%d\n", version_string, PATCHLEVEL);
/*
* Per GNU coding standards, print copyright info,
* then exit successfully, do nothing else.
*/
copyleft();
exit(0);
}
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