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freebsd-skq/contrib/awk/main.c
obrien 5931acbb5f We use the stock version of this file now, but since someone foolishly 
took about 15 files off the vendor branch for what turned out to be
good reason a Gawk update takes an order of magnitude more effort than
it should...
2001-11-02 21:57:00 +00:00

1007 lines
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/*
* main.c -- Expression tree constructors and main program for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2001 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"
#ifdef TANDEM
#include "ptchlvl.h" /* blech */
#else
#include "patchlev.h"
#endif
#ifndef O_BINARY
#include <fcntl.h>
#endif
#ifdef HAVE_MCHECK_H
#include <mcheck.h>
#endif
#define DEFAULT_PROFILE "awkprof.out" /* where to put profile */
#define DEFAULT_VARFILE "awkvars.out" /* where to put vars */
static char *varfile = DEFAULT_VARFILE;
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));
static void init_fds P((void));
/* These nodes store all the special variables AWK uses */
NODE *ARGC_node, *ARGIND_node, *ARGV_node, *BINMODE_node, *CONVFMT_node;
NODE *ENVIRON_node, *ERRNO_node, *FIELDWIDTHS_node, *FILENAME_node, *FNR_node;
NODE *FS_node, *IGNORECASE_node, *NF_node, *NR_node, *OFMT_node, *OFS_node;
NODE *ORS_node, *PROCINFO_node, *RLENGTH_node, *RSTART_node, *RS_node;
NODE *RT_node, *SUBSEP_node, *LINT_node, *TEXTDOMAIN_node;
long NF;
long NR;
long FNR;
int BINMODE;
int IGNORECASE;
char *OFS;
char *ORS;
char *OFMT;
char *TEXTDOMAIN;
int MRL; /* See -mr option for use of this variable */
/*
* 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(GAWKDEBUG)
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_intl = FALSE; /* dump locale-izable strings to stdout */
int do_non_decimal_data = FALSE; /* allow octal/hex C style DATA. Use with caution! */
int do_nostalgia = FALSE; /* provide a blast from the past */
int do_intervals = FALSE; /* allow {...,...} in regexps */
int do_profiling = FALSE; /* profile and pretty print the program */
int do_dump_vars = FALSE; /* dump all global variables at end */
int do_tidy_mem = FALSE; /* release vars when done */
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;
#if _MSC_VER == 510
void (*lintfunc) P((va_list va_alist, ...)) = warning;
#else
void (*lintfunc) P((char *mesg, ...)) = warning;
#endif
static struct option optab[] = {
{ "compat", no_argument, & do_traditional, 1 },
{ "traditional", no_argument, & do_traditional, 1 },
{ "lint", optional_argument, NULL, 'l' },
{ "lint-old", no_argument, & do_lint_old, 1 },
{ "posix", no_argument, & do_posix, 1 },
{ "nostalgia", no_argument, & do_nostalgia, 1 },
{ "gen-po", no_argument, & do_intl, 1 },
{ "non-decimal-data", no_argument, & do_non_decimal_data, 1 },
{ "profile", optional_argument, NULL, 'p' },
{ "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' },
{ "dump-variables", optional_argument, NULL, 'd' },
{ "assign", required_argument, NULL, 'v' },
{ "version", no_argument, NULL, 'V' },
{ "usage", no_argument, NULL, 'u' },
{ "help", no_argument, NULL, 'u' },
#ifdef GAWKDEBUG
{ "parsedebug", no_argument, NULL, 'D' },
#endif
{ NULL, 0, NULL, '\0' }
};
/* main --- process args, parse program, run it, clean up */
int
main(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;
/* do these checks early */
if (getenv("TIDYMEM") != NULL)
do_tidy_mem = TRUE;
#ifdef HAVE_MCHECK_H
if (do_tidy_mem)
mtrace();
#endif /* HAVE_MCHECK_H */
setlocale(LC_CTYPE, "");
setlocale(LC_COLLATE, "");
/* setlocale (LC_ALL, ""); */
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
(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();
/* Robustness: check that 0, 1, 2, exist */
init_fds();
/* 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)
lintwarn(_("`-m[fr]' option irrelevant in gawk"));
if (optarg[0] != 'r' && optarg[0] != 'f')
warning(_("-m option usage: `-m[fr] nnn'"));
/*
* Set fixed length records for Tandem,
* ignored on other platforms (see io.c:get_a_record).
*/
if (optarg[0] == 'r') {
if (ISDIGIT(optarg[1]))
MRL = atoi(optarg+1);
else {
MRL = atoi(argv[optind]);
optind++;
}
} else 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 'd':
do_dump_vars = TRUE;
if (optarg != NULL && optarg[0] != '\0')
varfile = optarg;
break;
case 'l':
do_lint = TRUE;
if (optarg != NULL && strcmp(optarg, "fatal") == 0)
lintfunc = r_fatal;
break;
case 'p':
do_profiling = TRUE;
if (optarg != NULL)
set_prof_file(optarg);
else
set_prof_file(DEFAULT_PROFILE);
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 GAWKDEBUG
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)
lintwarn(
_("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.
*/
}
if (do_traditional && do_non_decimal_data) {
do_non_decimal_data = FALSE;
warning(_("`--posix'/`--traditional' overrides `--non-decimal-data'"));
}
if (do_lint && os_is_setuid())
warning(_("runing %s setuid root may be a security problem"), myname);
/*
* 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();
}
/*
* Initialize profiling info, do after parsing args,
* in case this is pgawk. Don't bother if the command
* line already set profling up.
*/
if (! do_profiling)
init_profiling(& do_profiling, DEFAULT_PROFILE);
if ((BINMODE & 1) != 0)
if (os_setbinmode(fileno(stdin), O_BINARY) == -1)
fatal(_("can't set mode on stdin (%s)"), strerror(errno));
if ((BINMODE & 2) != 0) {
if (os_setbinmode(fileno(stdout), O_BINARY) == -1)
fatal(_("can't set mode on stdout (%s)"), strerror(errno));
if (os_setbinmode(fileno(stderr), O_BINARY) == -1)
fatal(_("can't set mode on stderr (%s)"), strerror(errno));
}
#ifdef GAWKDEBUG
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);
if (do_intl)
exit(0);
if (do_lint && begin_block == NULL && expression_value == NULL
&& end_block == NULL)
lintwarn(_("no program text at all!"));
if (do_lint)
shadow_funcs();
init_profiling_signals();
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;
if (do_profiling) {
dump_prog(begin_block, expression_value, end_block);
dump_funcs();
}
if (do_dump_vars)
dump_vars(varfile);
if (do_tidy_mem)
release_all_vars();
exit(exit_val); /* more portable */
return exit_val; /* to suppress warnings */
}
/* usage --- print usage information and exit */
static void
usage(int exitval, FILE *fp)
{
/* Not factoring out common stuff makes it easier to translate. */
fprintf(fp, _("Usage: %s [POSIX or GNU style options] -f progfile [--] file ...\n"),
myname);
fprintf(fp, _("Usage: %s [POSIX or GNU style options] [--] %cprogram%c file ...\n"),
myname, quote, quote);
/* GNU long options info. This is too many options. */
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 dump-variables[=file]\t--dump-variables[=file]\n"), fp);
fputs(_("\t-W gen-po\t\t--gen-po\n"), fp);
fputs(_("\t-W help\t\t\t--help\n"), fp);
fputs(_("\t-W lint[=fatal]\t\t--lint[=fatal]\n"), fp);
fputs(_("\t-W lint-old\t\t--lint-old\n"), fp);
fputs(_("\t-W non-decimal-data\t--non-decimal-data\n"), fp);
#ifdef NOSTALGIA
fputs(_("\t-W nostalgia\t\t--nostalgia\n"), fp);
#endif
#ifdef GAWKDEBUG
fputs(_("\t-W parsedebug\t\t--parsedebug\n"), fp);
#endif
fputs(_("\t-W profile[=file]\t--profile[=file]\n"), fp);
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 is\n"), fp);
fputs(_("section `Reporting Problems and Bugs' in the printed version.\n"), fp);
exit(exitval);
}
/* copyleft --- print out the short GNU copyright information */
static void
copyleft()
{
static char blurb_part1[] =
N_("Copyright (C) 1989, 1991-2001 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[] =
N_("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[] =
N_("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(char *str)
{
register NODE **tmp;
tmp = get_lhs(FS_node, (Func_ptr *) 0, FALSE);
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)
lintwarn(_("-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(int argc0, int 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), FALSE);
*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), FALSE);
*aptr = make_string(argv[i], strlen(argv[i]));
(*aptr)->flags |= MAYBE_NUM;
(*aptr)->flags &= ~UNINITIALIZED;
j++;
}
ARGC_node = install("ARGC",
node(make_number((AWKNUM) j), Node_var, (NODE *) NULL));
ARGC_node->flags &= ~UNINITIALIZED;
}
/*
* 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 },
{&BINMODE_node, "BINMODE", Node_BINMODE, NULL, 0, NULL },
{&LINT_node, "LINT", Node_LINT, NULL, 0, NULL },
{&TEXTDOMAIN_node, "TEXTDOMAIN", Node_TEXTDOMAIN, "messages", 0, set_TEXTDOMAIN },
{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;
(*(vp->spec))->flags &= ~UNINITIALIZED;
if (vp->assign)
(*(vp->assign))();
}
}
/* load_environ --- populate the ENVIRON array */
void
load_environ()
{
#if ! defined(TANDEM)
#if ! (defined(MSDOS) && !defined(DJGPP)) && ! defined(OS2) && ! (defined(VMS) && defined(__DECC))
extern char **environ;
#endif
register char *var, *val;
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)),
FALSE);
*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 within awk programs.
*/
if (getenv("AWKPATH") == NULL) {
aptr = assoc_lookup(ENVIRON_node, tmp_string("AWKPATH", 7), FALSE);
*aptr = make_string(defpath, strlen(defpath));
(*aptr)->flags |= SCALAR;
}
#endif /* TANDEM */
}
/* load_procinfo --- populate the PROCINFO array */
void
load_procinfo()
{
int i;
NODE **aptr;
char name[100];
AWKNUM value;
#if defined(NGROUPS_MAX) && NGROUPS_MAX > 0
GETGROUPS_T groupset[NGROUPS_MAX];
int ngroups;
#endif
PROCINFO_node = install("PROCINFO",
node(Nnull_string, Node_var, (NODE *) NULL));
#ifdef GETPGRP_VOID
#define getpgrp_arg() /* nothing */
#else
#define getpgrp_arg() getpid()
#endif
value = getpgrp(getpgrp_arg());
aptr = assoc_lookup(PROCINFO_node, tmp_string("pgrpid", 6), FALSE);
*aptr = make_number(value);
/*
* could put a lot of this into a table, but then there's
* portability problems declaring all the functions. so just
* do it the slow and stupid way. sigh.
*/
value = getpid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("pid", 3), FALSE);
*aptr = make_number(value);
value = getppid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("ppid", 4), FALSE);
*aptr = make_number(value);
value = getuid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("uid", 3), FALSE);
*aptr = make_number(value);
value = geteuid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("euid", 4), FALSE);
*aptr = make_number(value);
value = getgid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("gid", 3), FALSE);
*aptr = make_number(value);
value = getegid();
aptr = assoc_lookup(PROCINFO_node, tmp_string("egid", 4), FALSE);
*aptr = make_number(value);
aptr = assoc_lookup(PROCINFO_node, tmp_string("FS", 2), FALSE);
*aptr = make_string("FS", 2);
#if defined(NGROUPS_MAX) && NGROUPS_MAX > 0
ngroups = getgroups(NGROUPS_MAX, groupset);
if (ngroups == -1)
fatal(_("could not find groups: %s"), strerror(errno));
for (i = 0; i < ngroups; i++) {
sprintf(name, "group%d", i + 1);
value = groupset[i];
aptr = assoc_lookup(PROCINFO_node, tmp_string(name, strlen(name)), FALSE);
*aptr = make_number(value);
}
#endif
}
/* arg_assign --- process a command-line assignment */
char *
arg_assign(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)
lintwarn(_("invalid syntax in name `%s' for 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, FALSE);
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(char *v)
{
char *cp;
/*
* There is a problem when doing profiling. For -v x=y,
* the variable x gets installed into the symbol table pointing
* at the value in argv. This is what gets dumped. The string
* ends up containing the full x=y, leading to stuff in the profile
* of the form:
*
* if (x=y) ...
*
* Needless to say, this is gross, ugly and wrong. To fix, we
* malloc a private copy of the storage that we can tweak to
* our heart's content.
*
* This can't depend upon do_profiling; that variable isn't set up yet.
* Sigh.
*/
emalloc(cp, char *, strlen(v) + 1, "pre_assign");
strcpy(cp, v);
if (arg_assign(cp) == NULL) {
fprintf(stderr,
"%s: `%s' argument to `-v' not in `var=value' form\n",
myname, v);
usage(1, stderr);
}
cp = strchr(cp, '=');
assert(cp);
*cp = '\0';
}
/* catchsig --- catch signals */
RETSIGTYPE
catchsig(int sig, int 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()
{
/*
* N.B.: This string is not gettextized, on purpose.
* So there.
*/
fprintf(stderr, "awk: bailing out near line 1\n");
fflush(stderr);
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);
}
/* init_fds --- check for 0, 1, 2, open on /dev/null if possible */
static void
init_fds()
{
struct stat sbuf;
int fd;
int newfd;
/* maybe no stderr, don't bother with error mesg */
for (fd = 0; fd <= 2; fd++) {
if (fstat(fd, &sbuf) < 0) {
#if MAKE_A_HEROIC_EFFORT
if (do_lint)
lintwarn(_("no pre-opened fd %d"), fd);
#endif
newfd = devopen("/dev/null", "r+");
#ifdef MAKE_A_HEROIC_EFFORT
if (do_lint && newfd < 0)
lintwarn(_("could not pre-open /dev/null for fd %d"), fd);
#endif
}
}
}
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