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main.c
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main.c
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/*
* main.c -- Code generator and main program for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2021,
* 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* FIX THIS BEFORE EVERY RELEASE: */
#define UPDATE_YEAR 2021
#include "awk.h"
#include "getopt.h"
#ifdef HAVE_MCHECK_H
#include <mcheck.h>
#endif
#ifdef HAVE_LIBSIGSEGV
#include <sigsegv.h>
#else
typedef void *stackoverflow_context_t;
/* the argument to this macro is purposely not used */
#define sigsegv_install_handler(catchsegv) signal(SIGSEGV, catchsig)
/* define as 0 rather than empty so that (void) cast on it works */
#define stackoverflow_install_handler(catchstackoverflow, extra_stack, STACK_SIZE) 0
#endif
#define DEFAULT_PROFILE "awkprof.out" /* where to put profile */
#define DEFAULT_VARFILE "awkvars.out" /* where to put vars */
#define DEFAULT_PREC 53
#define DEFAULT_ROUNDMODE "N" /* round to nearest */
static const char *varfile = DEFAULT_VARFILE;
const char *command_file = NULL; /* debugger commands */
static void usage(int exitval, FILE *fp) ATTRIBUTE_NORETURN;
static void copyleft(void) ATTRIBUTE_NORETURN;
static void cmdline_fs(char *str);
static void init_args(int argc0, int argc, const char *argv0, char **argv);
static void init_vars(void);
static NODE *load_environ(void);
static NODE *load_procinfo(void);
static void catchsig(int sig);
#ifdef HAVE_LIBSIGSEGV
static int catchsegv(void *fault_address, int serious);
static void catchstackoverflow(int emergency, stackoverflow_context_t scp);
#endif
static void nostalgia(void) ATTRIBUTE_NORETURN;
static void version(void) ATTRIBUTE_NORETURN;
static void init_fds(void);
static void init_groupset(void);
static void save_argv(int, char **);
static const char *platform_name();
/* These nodes store all the special variables AWK uses */
NODE *ARGC_node, *ARGIND_node, *ARGV_node, *BINMODE_node, *CONVFMT_node;
static NODE *ENVIRON_node;
NODE *ERRNO_node, *FIELDWIDTHS_node, *FILENAME_node;
NODE *FNR_node, *FPAT_node, *FS_node, *IGNORECASE_node, *LINT_node;
NODE *NF_node, *NR_node, *OFMT_node, *OFS_node, *ORS_node, *PROCINFO_node;
NODE *RLENGTH_node, *RSTART_node, *RS_node, *RT_node, *SUBSEP_node;
NODE *PREC_node, *ROUNDMODE_node;
NODE *TEXTDOMAIN_node;
long NF;
long NR;
long FNR;
int BINMODE;
bool IGNORECASE;
char *OFS;
char *ORS;
char *OFMT;
char *TEXTDOMAIN;
/*
* 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 -> force_string: gets NULL CONVFMT
* Fun, fun, fun, fun.
*/
const char *CONVFMT = "%.6g";
NODE *Nnull_string; /* The global null string */
#if defined(HAVE_LOCALE_H)
struct lconv loc; /* current locale */
static void init_locale(struct lconv *l);
#endif /* defined(HAVE_LOCALE_H) */
/* The name the program was invoked under, for error messages */
const char *myname;
/* A block of AWK code to be run */
INSTRUCTION *code_block = NULL;
char **d_argv; /* saved argv for debugger restarting */
/*
* List of rules and functions with first and last instruction (source_line)
* information; used for profiling and debugging.
*/
INSTRUCTION *rule_list;
int exit_val = EXIT_SUCCESS; /* exit value */
#if defined(YYDEBUG) || defined(GAWKDEBUG)
extern int yydebug;
#endif
SRCFILE *srcfiles; /* source files */
/*
* structure to remember variable pre-assignments
*/
struct pre_assign {
enum assign_type { PRE_ASSIGN = 1, PRE_ASSIGN_FS } type;
char *val;
};
static struct pre_assign *preassigns = NULL; /* requested via -v or -F */
static long numassigns = -1; /* how many of them */
static bool disallow_var_assigns = false; /* true for --exec */
static void add_preassign(enum assign_type type, char *val);
static void parse_args(int argc, char **argv);
static void set_locale_stuff(void);
static bool stopped_early = false;
enum do_flag_values do_flags = DO_FLAG_NONE;
bool do_itrace = false; /* provide simple instruction trace */
bool do_optimize = true; /* apply default optimizations */
static int do_nostalgia = false; /* provide a blast from the past */
static int do_binary = false; /* hands off my data! */
static int do_version = false; /* print version info */
static const char *locale = ""; /* default value to setlocale */
static const char *locale_dir = LOCALEDIR; /* default locale dir */
int use_lc_numeric = false; /* obey locale for decimal point */
int gawk_mb_cur_max; /* MB_CUR_MAX value, see comment in main() */
FILE *output_fp; /* default gawk output, can be redirected in the debugger */
bool output_is_tty = false; /* control flushing of output */
/* default format for strftime(), available via PROCINFO */
const char def_strftime_format[] = "%a %b %e %H:%M:%S %Z %Y";
extern const char *version_string;
#if defined (HAVE_GETGROUPS) && defined(NGROUPS_MAX) && NGROUPS_MAX > 0
GETGROUPS_T *groupset; /* current group set */
int ngroups; /* size of said set */
#endif
void (*lintfunc)(const char *mesg, ...) = r_warning;
/* Sorted by long option name! */
static const struct option optab[] = {
{ "assign", required_argument, NULL, 'v' },
{ "bignum", no_argument, NULL, 'M' },
{ "characters-as-bytes", no_argument, & do_binary, 'b' },
{ "copyright", no_argument, NULL, 'C' },
{ "debug", optional_argument, NULL, 'D' },
{ "dump-variables", optional_argument, NULL, 'd' },
{ "exec", required_argument, NULL, 'E' },
{ "field-separator", required_argument, NULL, 'F' },
{ "file", required_argument, NULL, 'f' },
{ "gen-pot", no_argument, NULL, 'g' },
{ "help", no_argument, NULL, 'h' },
{ "include", required_argument, NULL, 'i' },
{ "lint", optional_argument, NULL, 'L' },
{ "lint-old", no_argument, NULL, 't' },
{ "load", required_argument, NULL, 'l' },
#if defined(LOCALEDEBUG)
{ "locale", required_argument, NULL, 'Z' },
#endif
{ "non-decimal-data", no_argument, NULL, 'n' },
{ "no-optimize", no_argument, NULL, 's' },
{ "nostalgia", no_argument, & do_nostalgia, 1 },
{ "optimize", no_argument, NULL, 'O' },
#if defined(YYDEBUG) || defined(GAWKDEBUG)
{ "parsedebug", no_argument, NULL, 'Y' },
#endif
{ "posix", no_argument, NULL, 'P' },
{ "pretty-print", optional_argument, NULL, 'o' },
{ "profile", optional_argument, NULL, 'p' },
{ "re-interval", no_argument, NULL, 'r' },
{ "sandbox", no_argument, NULL, 'S' },
{ "source", required_argument, NULL, 'e' },
{ "trace", no_argument, NULL, 'I' },
{ "traditional", no_argument, NULL, 'c' },
{ "use-lc-numeric", no_argument, & use_lc_numeric, 1 },
{ "version", no_argument, & do_version, 'V' },
{ NULL, 0, NULL, '\0' }
};
/* main --- process args, parse program, run it, clean up */
int
main(int argc, char **argv)
{
int i;
char *extra_stack;
bool have_srcfile = false;
SRCFILE *s;
char *cp;
#if defined(LOCALEDEBUG)
const char *initial_locale;
#endif
/* do these checks early */
if (getenv("TIDYMEM") != NULL)
do_flags |= DO_TIDY_MEM;
#ifdef HAVE_MCHECK_H
#ifdef HAVE_MTRACE
if (do_tidy_mem)
mtrace();
#endif /* HAVE_MTRACE */
#endif /* HAVE_MCHECK_H */
myname = gawk_name(argv[0]);
os_arg_fixup(&argc, &argv); /* emulate redirection, expand wildcards */
if (argc < 2)
usage(EXIT_FAILURE, stderr);
if ((cp = getenv("GAWK_LOCALE_DIR")) != NULL)
locale_dir = cp;
#if defined(F_GETFL) && defined(O_APPEND)
// 1/2018: This is needed on modern BSD systems so that the
// inplace tests pass. I think it's a bug in those kernels
// but let's just work around it anyway.
int flags = fcntl(fileno(stderr), F_GETFL, NULL);
if (flags >= 0 && (flags & O_APPEND) == 0) {
flags |= O_APPEND;
(void) fcntl(fileno(stderr), F_SETFL, flags);
}
#endif
#if defined(LOCALEDEBUG)
initial_locale = locale;
#endif
set_locale_stuff();
(void) signal(SIGFPE, catchsig);
#ifdef SIGBUS
(void) signal(SIGBUS, catchsig);
#endif
/*
* Ignore SIGPIPE so that writes to pipes that fail don't
* kill the process but instead return -1 and set errno.
* That lets us print a fatal message instead of dieing suddenly.
*
* Note that this requires ignoring EPIPE when writing and
* flushing stdout/stderr in other parts of the program. E.g.,
*
* gawk 'BEGIN { print "hi" }' | exit
*
* should not give us "broken pipe" messages --- mainly because
* it did not do so in the past and people would complain.
*/
ignore_sigpipe();
(void) sigsegv_install_handler(catchsegv);
#define STACK_SIZE (16*1024)
emalloc(extra_stack, char *, STACK_SIZE, "main");
(void) stackoverflow_install_handler(catchstackoverflow, extra_stack, STACK_SIZE);
#undef STACK_SIZE
/* initialize the null string */
Nnull_string = make_string("", 0);
/* Robustness: check that file descriptors 0, 1, 2 are open */
init_fds();
/* init array handling. */
array_init();
/* init the symbol tables */
init_symbol_table();
output_fp = stdout;
/* initialize global (main) execution context */
push_context(new_context());
parse_args(argc, argv);
#if defined(LOCALEDEBUG)
if (locale != initial_locale)
set_locale_stuff();
#endif
/*
* In glibc, MB_CUR_MAX is actually a function. This value is
* tested *a lot* in many speed-critical places in gawk. Caching
* this value once makes a speed difference.
*/
gawk_mb_cur_max = MB_CUR_MAX;
/* init the cache for checking bytes if they're characters */
init_btowc_cache();
/* set up the single byte case table */
if (gawk_mb_cur_max == 1)
load_casetable();
if (do_nostalgia)
nostalgia();
/* check for POSIXLY_CORRECT environment variable */
if (! do_posix && getenv("POSIXLY_CORRECT") != NULL) {
do_flags |= DO_POSIX;
if (do_lint)
lintwarn(
_("environment variable `POSIXLY_CORRECT' set: turning on `--posix'"));
}
// Checks for conflicting command-line arguments.
if (do_posix) {
use_lc_numeric = true;
if (do_traditional) /* both on command line */
warning(_("`--posix' overrides `--traditional'"));
else
do_flags |= DO_TRADITIONAL;
/*
* POSIX compliance also implies
* no GNU extensions either.
*/
}
if (do_traditional && do_non_decimal_data) {
do_flags &= ~DO_NON_DEC_DATA;
warning(_("`--posix'/`--traditional' overrides `--non-decimal-data'"));
}
if (do_binary) {
if (do_posix)
warning(_("`--posix' overrides `--characters-as-bytes'"));
else {
gawk_mb_cur_max = 1; /* hands off my data! */
#if defined(LC_ALL)
setlocale(LC_ALL, "C");
#endif
}
}
if (do_lint && os_is_setuid())
lintwarn(_("running %s setuid root may be a security problem"), myname);
if (do_debug) /* Need to register the debugger pre-exec hook before any other */
init_debug();
#ifdef HAVE_MPFR
/* Set up MPFR defaults, and register pre-exec hook to process arithmetic opcodes */
if (do_mpfr)
init_mpfr(DEFAULT_PREC, DEFAULT_ROUNDMODE);
#endif
/* load group set */
init_groupset();
#ifdef HAVE_MPFR
if (do_mpfr) {
mpz_init(Nnull_string->mpg_i);
Nnull_string->flags = (MALLOC|STRCUR|STRING|MPZN|NUMCUR|NUMBER);
} else
#endif
{
Nnull_string->numbr = 0.0;
Nnull_string->flags = (MALLOC|STRCUR|STRING|NUMCUR|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 */
init_vars();
/* Set up the field variables */
init_fields();
/* Now process the pre-assignments */
int dash_v_errs = 0; // bad stuff for -v
for (i = 0; i <= numassigns; i++) {
if (preassigns[i].type == PRE_ASSIGN)
dash_v_errs += (arg_assign(preassigns[i].val, true) == false);
else /* PRE_ASSIGN_FS */
cmdline_fs(preassigns[i].val);
efree(preassigns[i].val);
}
if (preassigns != NULL)
efree(preassigns);
if ((BINMODE & BINMODE_INPUT) != 0)
if (os_setbinmode(fileno(stdin), O_BINARY) == -1)
fatal(_("cannot set binary mode on stdin: %s"), strerror(errno));
if ((BINMODE & BINMODE_OUTPUT) != 0) {
if (os_setbinmode(fileno(stdout), O_BINARY) == -1)
fatal(_("cannot set binary mode on stdout: %s"), strerror(errno));
if (os_setbinmode(fileno(stderr), O_BINARY) == -1)
fatal(_("cannot set binary mode on stderr: %s"), strerror(errno));
}
#ifdef GAWKDEBUG
setbuf(stdout, (char *) NULL); /* make debugging easier */
#endif
if (os_isatty(fileno(stdout)))
output_is_tty = true;
/* initialize API before loading extension libraries */
init_ext_api();
/* load extension libs */
for (s = srcfiles->next; s != srcfiles; s = s->next) {
if (s->stype == SRC_EXTLIB)
load_ext(s->fullpath);
else if (s->stype != SRC_INC)
have_srcfile = true;
}
/* do version check after extensions are loaded to get extension info */
if (do_version)
version();
/* No -f or --source options, use next arg */
if (! have_srcfile) {
if (optind > argc - 1 || stopped_early) /* no args left or no program */
usage(EXIT_FAILURE, stderr);
(void) add_srcfile(SRC_CMDLINE, argv[optind], srcfiles, NULL, NULL);
optind++;
}
/* Select the interpreter routine */
init_interpret();
init_args(optind, argc,
do_posix ? argv[0] : myname,
argv);
#if defined(LC_NUMERIC)
/*
* FRAGILE! CAREFUL!
* Pre-initing the variables with arg_assign() can change the
* locale. Force it to C before parsing the program.
*/
setlocale(LC_NUMERIC, "C");
#endif
/* Read in the program */
if (parse_program(& code_block, false) != 0 || dash_v_errs > 0)
exit(EXIT_FAILURE);
if (do_intl)
exit(EXIT_SUCCESS);
set_current_namespace(awk_namespace);
install_builtins();
if (do_lint)
shadow_funcs();
if (do_lint && code_block->nexti->opcode == Op_atexit)
lintwarn(_("no program text at all!"));
load_symbols();
if (do_profile)
init_profiling_signals();
#if defined(LC_NUMERIC)
/*
* See comment above about using locale's decimal point.
*
* 10/2005:
* Bitter experience teaches us that most people the world over
* use period as the decimal point, not whatever their locale
* uses. Thus, only use the locale's decimal point if being
* posixly anal-retentive.
*
* 7/2007:
* Be a little bit kinder. Allow the --use-lc-numeric option
* to also use the local decimal point. This avoids the draconian
* strictness of POSIX mode if someone just wants to parse their
* data using the local decimal point.
*/
if (use_lc_numeric)
setlocale(LC_NUMERIC, locale);
#endif
init_io();
output_fp = stdout;
if (do_debug)
debug_prog(code_block);
else if (do_pretty_print && ! do_profile)
; /* run pretty printer only. */
else
interpret(code_block);
if (do_pretty_print) {
set_current_namespace(awk_namespace);
dump_prog(code_block);
dump_funcs();
}
if (do_dump_vars)
dump_vars(varfile);
#ifdef HAVE_MPFR
if (do_mpfr)
cleanup_mpfr();
#endif
if (do_tidy_mem)
release_all_vars();
/* keep valgrind happier */
if (extra_stack)
efree(extra_stack);
final_exit(exit_val);
return exit_val; /* to suppress warnings */
}
/* add_preassign --- add one element to preassigns */
static void
add_preassign(enum assign_type type, char *val)
{
static long alloc_assigns; /* for how many are allocated */
#define INIT_SRC 4
++numassigns;
if (preassigns == NULL) {
emalloc(preassigns, struct pre_assign *,
INIT_SRC * sizeof(struct pre_assign), "add_preassign");
alloc_assigns = INIT_SRC;
} else if (numassigns >= alloc_assigns) {
alloc_assigns *= 2;
erealloc(preassigns, struct pre_assign *,
alloc_assigns * sizeof(struct pre_assign), "add_preassigns");
}
preassigns[numassigns].type = type;
preassigns[numassigns].val = estrdup(val, strlen(val));
#undef INIT_SRC
}
/* 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: (standard)\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(_("Short options:\t\tGNU long options: (extensions)\n"), fp);
fputs(_("\t-b\t\t\t--characters-as-bytes\n"), fp);
fputs(_("\t-c\t\t\t--traditional\n"), fp);
fputs(_("\t-C\t\t\t--copyright\n"), fp);
fputs(_("\t-d[file]\t\t--dump-variables[=file]\n"), fp);
fputs(_("\t-D[file]\t\t--debug[=file]\n"), fp);
fputs(_("\t-e 'program-text'\t--source='program-text'\n"), fp);
fputs(_("\t-E file\t\t\t--exec=file\n"), fp);
fputs(_("\t-g\t\t\t--gen-pot\n"), fp);
fputs(_("\t-h\t\t\t--help\n"), fp);
fputs(_("\t-i includefile\t\t--include=includefile\n"), fp);
fputs(_("\t-I\t\t\t--trace\n"), fp);
fputs(_("\t-l library\t\t--load=library\n"), fp);
/*
* TRANSLATORS: the "fatal", "invalid" and "no-ext" here are literal
* values, they should not be translated. Thanks.
*/
fputs(_("\t-L[fatal|invalid|no-ext]\t--lint[=fatal|invalid|no-ext]\n"), fp);
fputs(_("\t-M\t\t\t--bignum\n"), fp);
fputs(_("\t-N\t\t\t--use-lc-numeric\n"), fp);
fputs(_("\t-n\t\t\t--non-decimal-data\n"), fp);
fputs(_("\t-o[file]\t\t--pretty-print[=file]\n"), fp);
fputs(_("\t-O\t\t\t--optimize\n"), fp);
fputs(_("\t-p[file]\t\t--profile[=file]\n"), fp);
fputs(_("\t-P\t\t\t--posix\n"), fp);
fputs(_("\t-r\t\t\t--re-interval\n"), fp);
fputs(_("\t-s\t\t\t--no-optimize\n"), fp);
fputs(_("\t-S\t\t\t--sandbox\n"), fp);
fputs(_("\t-t\t\t\t--lint-old\n"), fp);
fputs(_("\t-V\t\t\t--version\n"), fp);
#ifdef NOSTALGIA
fputs(_("\t-W nostalgia\t\t--nostalgia\n"), fp);
#endif
#ifdef GAWKDEBUG
fputs(_("\t-Y\t\t\t--parsedebug\n"), fp);
#endif
#ifdef GAWKDEBUG
fputs(_("\t-Z locale-name\t\t--locale=locale-name\n"), fp);
#endif
/* This is one string to make things easier on translators. */
/* TRANSLATORS: --help output (end)
no-wrap */
fputs(_("\nTo report bugs, see node `Bugs' in `gawk.info'\n\
which is section `Reporting Problems and Bugs' in the\n\
printed version. This same information may be found at\n\
https://www.gnu.org/software/gawk/manual/html_node/Bugs.html.\n\
PLEASE do NOT try to report bugs by posting in comp.lang.awk,\n\
or by using a web forum such as Stack Overflow.\n\n"), fp);
/* ditto */
fputs(_("gawk is a pattern scanning and processing language.\n\
By default it reads standard input and writes standard output.\n\n"), fp);
/* ditto */
fprintf(fp, _("Examples:\n\t%s '{ sum += $1 }; END { print sum }' file\n\
\t%s -F: '{ print $1 }' /etc/passwd\n"), myname, myname);
fflush(fp);
if (ferror(fp)) {
os_maybe_set_errno();
/* don't warn about stdout/stderr if EPIPE, but do error exit */
if (errno == EPIPE)
die_via_sigpipe();
if (fp == stdout)
warning(_("error writing standard output: %s"), strerror(errno));
else if (fp == stderr)
warning(_("error writing standard error: %s"), strerror(errno));
// some other problem than SIGPIPE
exit(EXIT_FAILURE);
}
exit(exitval);
}
/* copyleft --- print out the short GNU copyright information */
static void
copyleft()
{
static const char blurb_part1[] =
N_("Copyright (C) 1989, 1991-%d 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 3 of the License, or\n\
(at your option) any later version.\n\
\n");
static const 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 const char blurb_part3[] =
N_("You should have received a copy of the GNU General Public License\n\
along with this program. If not, see http://www.gnu.org/licenses/.\n");
/* multiple blurbs are needed for some brain dead compilers. */
printf(_(blurb_part1), UPDATE_YEAR); /* Last update year */
fputs(_(blurb_part2), stdout);
fputs(_(blurb_part3), stdout);
fflush(stdout);
if (ferror(stdout)) {
os_maybe_set_errno();
/* don't warn about stdout if EPIPE, but do error exit */
if (errno != EPIPE)
warning(_("error writing standard output: %s"), strerror(errno));
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
/* cmdline_fs --- set FS from the command line */
static void
cmdline_fs(char *str)
{
NODE **tmp;
tmp = &FS_node->var_value;
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 propagate 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, const char *argv0, char **argv)
{
int i, j;
NODE *sub, *val;
NODE *shadow_node = NULL;
ARGV_node = install_symbol(estrdup("ARGV", 4), Node_var_array);
sub = make_number(0.0);
val = make_string(argv0, strlen(argv0));
val->flags |= USER_INPUT;
assoc_set(ARGV_node, sub, val);
if (do_sandbox) {
shadow_node = make_array();
sub = make_string(argv0, strlen(argv0));
val = make_number(0.0);
assoc_set(shadow_node, sub, val);
}
for (i = argc0, j = 1; i < argc; i++, j++) {
sub = make_number((AWKNUM) j);
val = make_string(argv[i], strlen(argv[i]));
val->flags |= USER_INPUT;
assoc_set(ARGV_node, sub, val);
if (do_sandbox) {
sub = make_string(argv[i], strlen(argv[i]));
val = make_number(0.0);
assoc_set(shadow_node, sub, val);
}
}
ARGC_node = install_symbol(estrdup("ARGC", 4), Node_var);
ARGC_node->var_value = make_number((AWKNUM) j);
if (do_sandbox)
init_argv_array(ARGV_node, shadow_node);
}
/*
* 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;
const char *strval;
AWKNUM numval;
Func_ptr update;
Func_ptr assign;
bool do_assign;
int flags;
#define NO_INSTALL 0x01
#define NON_STANDARD 0x02
#define NOT_OFF_LIMITS 0x04 /* may be accessed by extension function */
};
static const struct varinit varinit[] = {
{NULL, "ARGC", NULL, 0, NULL, NULL, false, NO_INSTALL },
{&ARGIND_node, "ARGIND", NULL, 0, NULL, NULL, false, NON_STANDARD },
{NULL, "ARGV", NULL, 0, NULL, NULL, false, NO_INSTALL },
{&BINMODE_node, "BINMODE", NULL, 0, NULL, set_BINMODE, false, NON_STANDARD },
{&CONVFMT_node, "CONVFMT", "%.6g", 0, NULL, set_CONVFMT,true, 0 },
{NULL, "ENVIRON", NULL, 0, NULL, NULL, false, NO_INSTALL },
{&ERRNO_node, "ERRNO", "", 0, NULL, NULL, false, NON_STANDARD },
{&FIELDWIDTHS_node, "FIELDWIDTHS", "", 0, NULL, set_FIELDWIDTHS, false, NON_STANDARD },
{&FILENAME_node, "FILENAME", "", 0, NULL, NULL, false, 0 },
{&FNR_node, "FNR", NULL, 0, update_FNR, set_FNR, true, 0 },
{&FS_node, "FS", " ", 0, NULL, set_FS, false, 0 },
{&FPAT_node, "FPAT", "[^[:space:]]+", 0, NULL, set_FPAT, false, NON_STANDARD },
{&IGNORECASE_node, "IGNORECASE", NULL, 0, NULL, set_IGNORECASE, false, NON_STANDARD },
{&LINT_node, "LINT", NULL, 0, NULL, set_LINT, false, NON_STANDARD },
{&PREC_node, "PREC", NULL, DEFAULT_PREC, NULL, set_PREC, false, NON_STANDARD},
{&NF_node, "NF", NULL, -1, update_NF, set_NF, false, 0 },
{&NR_node, "NR", NULL, 0, update_NR, set_NR, true, 0 },
{&OFMT_node, "OFMT", "%.6g", 0, NULL, set_OFMT, true, 0 },
{&OFS_node, "OFS", " ", 0, NULL, set_OFS, true, 0 },
{&ORS_node, "ORS", "\n", 0, NULL, set_ORS, true, 0 },
{NULL, "PROCINFO", NULL, 0, NULL, NULL, false, NO_INSTALL | NON_STANDARD | NOT_OFF_LIMITS },
{&RLENGTH_node, "RLENGTH", NULL, 0, NULL, NULL, false, 0 },
{&ROUNDMODE_node, "ROUNDMODE", DEFAULT_ROUNDMODE, 0, NULL, set_ROUNDMODE, false, NON_STANDARD },
{&RS_node, "RS", "\n", 0, NULL, set_RS, true, 0 },
{&RSTART_node, "RSTART", NULL, 0, NULL, NULL, false, 0 },
{&RT_node, "RT", "", 0, NULL, NULL, false, NON_STANDARD },
{&SUBSEP_node, "SUBSEP", "\034", 0, NULL, set_SUBSEP, true, 0 },
{&TEXTDOMAIN_node, "TEXTDOMAIN", "messages", 0, NULL, set_TEXTDOMAIN, true, NON_STANDARD },
{0, NULL, NULL, 0, NULL, NULL, false, 0 },
};
/* init_vars --- actually initialize everything in the symbol table */
static void
init_vars()
{
const struct varinit *vp;
NODE *n;
for (vp = varinit; vp->name != NULL; vp++) {
if ((vp->flags & NO_INSTALL) != 0)
continue;
n = *(vp->spec) = install_symbol(estrdup(vp->name, strlen(vp->name)), Node_var);
if (vp->strval != NULL)
n->var_value = make_string(vp->strval, strlen(vp->strval));
else
n->var_value = make_number(vp->numval);
n->var_assign = (Func_ptr) vp->assign;
n->var_update = (Func_ptr) vp->update;
if (vp->do_assign)
(*(vp->assign))();
}
/* Load PROCINFO and ENVIRON */
if (! do_traditional)
load_procinfo();
load_environ();
}
/* path_environ --- put path variable into environment if not already there */
static void
path_environ(const char *pname, const char *dflt)
{
const char *val;
NODE **aptr;
NODE *tmp;
tmp = make_string(pname, strlen(pname));
/*
* On VMS, environ[] only holds a subset of what getenv() can
* find, so look AWKPATH up before resorting to default path.
*/
val = getenv(pname);
if (val == NULL || *val == '\0')
val = dflt;
aptr = assoc_lookup(ENVIRON_node, tmp);
/*
* If original value was the empty string, set it to
* the default value.
*/
if ((*aptr)->stlen == 0) {
unref(*aptr);
*aptr = make_string(val, strlen(val));
}
unref(tmp);
}
/* load_environ --- populate the ENVIRON array */
static NODE *
load_environ()
{
#if ! (defined(VMS) && defined(__DECC))
extern char **environ;
#endif
char *var, *val;
int i;
NODE *sub, *newval;
static bool been_here = false;
if (been_here)
return ENVIRON_node;
been_here = true;
ENVIRON_node = install_symbol(estrdup("ENVIRON", 7), Node_var_array);
for (i = 0; environ[i] != NULL; i++) {
static char nullstr[] = "";
var = environ[i];
val = strchr(var, '=');
if (val != NULL)
*val++ = '\0';
else
val = nullstr;
sub = make_string(var, strlen(var));
newval = make_string(val, strlen(val));
newval->flags |= USER_INPUT;
assoc_set(ENVIRON_node, sub, newval);
/* restore '=' so that system() gets a valid environment */
if (val != nullstr)
*--val = '=';
}
/*
* Put AWKPATH and AWKLIBPATH into ENVIRON if not already there.
* This allows querying it from within awk programs.
*
* October 2014:
* If their values are "", override with the default values;
* since 2.10 AWKPATH used default value if environment's
* value was "".
*/
path_environ("AWKPATH", defpath);
path_environ("AWKLIBPATH", deflibpath);
/* set up array functions */
init_env_array(ENVIRON_node);
return ENVIRON_node;
}
/* load_procinfo_argv --- populate PROCINFO["argv"] */
static void
load_procinfo_argv()
{
NODE *sub;
NODE *val;
NODE *argv_array;
int i;
// build the sub-array first
getnode(argv_array);
memset(argv_array, '\0', sizeof(NODE)); /* valgrind wants this */
null_array(argv_array);
argv_array->parent_array = PROCINFO_node;
argv_array->vname = estrdup("argv", 4);
for (i = 0; d_argv[i] != NULL; i++) {
sub = make_number(i);
val = make_string(d_argv[i], strlen(d_argv[i]));
assoc_set(argv_array, sub, val);
}
// hook it into PROCINFO
sub = make_string("argv", 4);
assoc_set(PROCINFO_node, sub, argv_array);
}
/* load_procinfo --- populate the PROCINFO array */
static NODE *
load_procinfo()
{
#if defined (HAVE_GETGROUPS) && defined(NGROUPS_MAX) && NGROUPS_MAX > 0
int i;
#endif
#if (defined (HAVE_GETGROUPS) && defined(NGROUPS_MAX) && NGROUPS_MAX > 0) || defined(HAVE_MPFR)
char name[100];
#endif
AWKNUM value;
static bool been_here = false;
if (been_here)
return PROCINFO_node;
been_here = true;