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NetBSD/gnu/usr.bin/gawk/main.c
jtc 48377e5b3f Upgrade to Gawk 2.15.5
1994-05-20 08:03:48 +00:00

815 lines
20 KiB
C
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/*
* main.c -- Expression tree constructors and main program for gawk.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991, 1992, 1993 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 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 GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "getopt.h"
#include "awk.h"
#include "patchlevel.h"
static void usage P((int exitval));
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));
static void version P((void));
char *gawk_name P((char *filespec));
#ifdef MSDOS
extern int isatty P((int));
#endif
extern void resetup 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 *ERRNO_node;
NODE *FNR_node, *RLENGTH_node, *RSTART_node, *SUBSEP_node;
NODE *ENVIRON_node, *IGNORECASE_node;
NODE *ARGC_node, *ARGV_node, *ARGIND_node;
NODE *FIELDWIDTHS_node;
long NF;
long NR;
long FNR;
int IGNORECASE;
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
struct src *srcfiles = NULL; /* source file name(s) */
int numfiles = -1; /* how many source files */
int do_unix = 0; /* turn off gnu extensions */
int do_posix = 0; /* turn off gnu and unix extensions */
int do_lint = 0; /* provide warnings about questionable stuff */
int do_nostalgia = 0; /* provide a blast from the past */
int in_begin_rule = 0; /* we're in a BEGIN rule */
int in_end_rule = 0; /* we're in a END rule */
int output_is_tty = 0; /* control flushing of output */
extern char *version_string; /* current version, for printing */
NODE *expression_value;
static struct option optab[] = {
{ "compat", no_argument, & do_unix, 1 },
{ "lint", no_argument, & do_lint, 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' },
{ "assign", required_argument, NULL, 'v' },
{ "version", no_argument, NULL, 'V' },
{ "usage", no_argument, NULL, 'u' },
{ "help", no_argument, NULL, 'u' },
{ "source", required_argument, NULL, 's' },
#ifdef DEBUG
{ "parsedebug", no_argument, NULL, 'D' },
#endif
{ 0, 0, 0, 0 }
};
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 = 0;
int old_optind;
extern int optind;
extern int opterr;
extern char *optarg;
#ifdef __EMX__
_response(&argc, &argv);
_wildcard(&argc, &argv);
setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
#endif
(void) signal(SIGFPE, (SIGTYPE (*) P((int))) catchsig);
(void) signal(SIGSEGV, (SIGTYPE (*) P((int))) catchsig);
#ifdef SIGBUS
(void) signal(SIGBUS, (SIGTYPE (*) P((int))) catchsig);
#endif
myname = gawk_name(argv[0]);
argv[0] = (char *)myname;
#ifdef VMS
vms_arg_fixup(&argc, &argv); /* emulate redirection, expand wildcards */
#endif
/* remove sccs gunk */
if (strncmp(version_string, "@(#)", 4) == 0)
version_string += 4;
if (argc < 2)
usage(1);
/* 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);
/* Set up the special variables */
/*
* Note that this must be done BEFORE arg parsing else -F
* breaks horribly
*/
init_vars();
/* worst case */
emalloc(srcfiles, struct src *, argc * sizeof(struct src), "main");
memset(srcfiles, '\0', argc * sizeof(struct src));
/* Tell the regex routines how they should work. . . */
resetup();
/* we do error messages ourselves on invalid options */
opterr = 0;
/* 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 = 1;
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");
if ((optarg[0] != 'r' && optarg[0] != 'f')
|| optarg[1] != '=')
warning("-m option usage: -m[fn]=nnn");
break;
case 'W': /* gawk specific options */
gawk_option(optarg);
break;
/* These can only come from long form options */
case 'V':
version();
break;
case 'C':
copyleft();
break;
case 'u':
usage(0);
break;
case 's':
if (optarg[0] == '\0')
warning("empty argument to --source ignored");
else {
srcfiles[++numfiles].stype = CMDLINE;
srcfiles[numfiles].val = optarg;
}
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 = 1;
goto out;
} else if (optopt)
/* 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 = 1;
if (do_lint)
warning(
"environment variable `POSIXLY_CORRECT' set: turning on --posix");
}
/* POSIX compliance also implies no Unix extensions either */
if (do_posix)
do_unix = 1;
#ifdef DEBUG
setbuf(stdout, (char *) NULL); /* make debugging easier */
#endif
if (isatty(fileno(stdout)))
output_is_tty = 1;
/* 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);
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() || errcount)
exit(1);
/* Set up the field variables */
init_fields();
if (do_lint && begin_block == NULL && expression_value == NULL
&& end_block == NULL)
warning("no program");
if (begin_block) {
in_begin_rule = 1;
(void) interpret(begin_block);
}
in_begin_rule = 0;
if (!exiting && (expression_value || end_block))
do_input();
if (end_block) {
in_end_rule = 1;
(void) interpret(end_block);
}
in_end_rule = 0;
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)
int exitval;
{
const char *opt1 = " -f progfile [--]";
#if defined(MSDOS) || defined(OS2) || defined(VMS)
const char *opt2 = " [--] \"program\"";
#else
const char *opt2 = " [--] 'program'";
#endif
const char *regops = " [POSIX or GNU style options]";
fprintf(stderr, "Usage:\t%s%s%s file ...\n\t%s%s%s file ...\n",
myname, regops, opt1, myname, regops, opt2);
/* GNU long options info. Gack. */
fputs("POSIX options:\t\tGNU long options:\n", stderr);
fputs("\t-f progfile\t\t--file=progfile\n", stderr);
fputs("\t-F fs\t\t\t--field-separator=fs\n", stderr);
fputs("\t-v var=val\t\t--assign=var=val\n", stderr);
fputs("\t-m[fr]=val\n", stderr);
fputs("\t-W compat\t\t--compat\n", stderr);
fputs("\t-W copyleft\t\t--copyleft\n", stderr);
fputs("\t-W copyright\t\t--copyright\n", stderr);
fputs("\t-W help\t\t\t--help\n", stderr);
fputs("\t-W lint\t\t\t--lint\n", stderr);
#ifdef NOSTALGIA
fputs("\t-W nostalgia\t\t--nostalgia\n", stderr);
#endif
#ifdef DEBUG
fputs("\t-W parsedebug\t\t--parsedebug\n", stderr);
#endif
fputs("\t-W posix\t\t--posix\n", stderr);
fputs("\t-W source=program-text\t--source=program-text\n", stderr);
fputs("\t-W usage\t\t--usage\n", stderr);
fputs("\t-W version\t\t--version\n", stderr);
exit(exitval);
}
static void
copyleft ()
{
static char blurb_part1[] =
"Copyright (C) 1989, 1991, 1992, 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., 675 Mass Ave, Cambridge, MA 02139, USA.\n";
fputs(blurb_part1, stderr);
fputs(blurb_part2, stderr);
fputs(blurb_part3, stderr);
fflush(stderr);
}
static void
cmdline_fs(str)
char *str;
{
register NODE **tmp;
/* int len = strlen(str); *//* don't do that - we want to
avoid mismatched types */
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 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_unix && ! do_posix)
str[0] = '\t';
}
*tmp = make_str_node(str, strlen(str), SCAN); /* do process escapes */
set_FS();
}
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, (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.
*/
struct varinit {
NODE **spec;
const char *name;
NODETYPE type;
const char *strval;
AWKNUM numval;
Func_ptr assign;
};
static struct varinit varinit[] = {
{&NF_node, "NF", Node_NF, 0, -1, set_NF },
{&FIELDWIDTHS_node, "FIELDWIDTHS", Node_FIELDWIDTHS, "", 0, 0 },
{&NR_node, "NR", Node_NR, 0, 0, set_NR },
{&FNR_node, "FNR", Node_FNR, 0, 0, set_FNR },
{&FS_node, "FS", Node_FS, " ", 0, 0 },
{&RS_node, "RS", Node_RS, "\n", 0, set_RS },
{&IGNORECASE_node, "IGNORECASE", Node_IGNORECASE, 0, 0, set_IGNORECASE },
{&FILENAME_node, "FILENAME", Node_var, "", 0, 0 },
{&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 },
{&CONVFMT_node, "CONVFMT", Node_CONVFMT, "%.6g", 0, set_CONVFMT },
{&RLENGTH_node, "RLENGTH", Node_var, 0, 0, 0 },
{&RSTART_node, "RSTART", Node_var, 0, 0, 0 },
{&SUBSEP_node, "SUBSEP", Node_var, "\034", 0, 0 },
{&ARGIND_node, "ARGIND", Node_var, 0, 0, 0 },
{&ERRNO_node, "ERRNO", Node_var, 0, 0, 0 },
{0, 0, Node_illegal, 0, 0, 0 },
};
static void
init_vars()
{
register struct varinit *vp;
for (vp = varinit; vp->name; vp++) {
*(vp->spec) = install((char *) vp->name,
node(vp->strval == 0 ? make_number(vp->numval)
: make_string((char *) vp->strval,
strlen(vp->strval)),
vp->type, (NODE *) NULL));
if (vp->assign)
(*(vp->assign))();
}
}
void
load_environ()
{
#if !defined(MSDOS) && !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]; i++) {
static char nullstr[] = "";
var = environ[i];
val = strchr(var, '=');
if (val)
*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;
/* restore '=' so that system() gets a valid environment */
if (val != nullstr)
*--val = '=';
}
}
/* 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 = 0;
if (! isalpha(arg[0]) && arg[0] != '_')
badvar = 1;
else
for (cp2 = arg+1; *cp2; cp2++)
if (! isalnum(*cp2) && *cp2 != '_') {
badvar = 1;
break;
}
if (badvar)
fatal("illegal name `%s' in variable assignment", arg);
/*
* 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;
var = variable(arg, 0);
lhs = get_lhs(var, &after_assign);
unref(*lhs);
*lhs = it;
if (after_assign)
(*after_assign)();
*--cp = '='; /* restore original text of ARGV */
}
return cp;
}
static void
pre_assign(v)
char *v;
{
if (!arg_assign(v)) {
fprintf (stderr,
"%s: '%s' argument to -v not in 'var=value' form\n",
myname, v);
usage(1);
}
}
SIGTYPE
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
) {
msg("fatal error: internal error");
/* fatal won't abort() if not compiled for debugging */
abort();
} else
cant_happen();
/* NOTREACHED */
}
/* gawk_option --- do gawk specific things */
static void
gawk_option(optstr)
char *optstr;
{
char *cp;
for (cp = optstr; *cp; cp++) {
switch (*cp) {
case ' ':
case '\t':
case ',':
break;
case 'v':
case 'V':
/* print version */
if (strncasecmp(cp, "version", 7) != 0)
goto unknown;
else
cp += 6;
version();
break;
case 'c':
case 'C':
if (strncasecmp(cp, "copyright", 9) == 0) {
cp += 8;
copyleft();
} else if (strncasecmp(cp, "copyleft", 8) == 0) {
cp += 7;
copyleft();
} else if (strncasecmp(cp, "compat", 6) == 0) {
cp += 5;
do_unix = 1;
} else
goto unknown;
break;
case 'n':
case 'N':
/*
* Undocumented feature,
* inspired by nostalgia, and a T-shirt
*/
if (strncasecmp(cp, "nostalgia", 9) != 0)
goto unknown;
nostalgia();
break;
case 'p':
case 'P':
#ifdef DEBUG
if (strncasecmp(cp, "parsedebug", 10) == 0) {
cp += 9;
yydebug = 2;
break;
}
#endif
if (strncasecmp(cp, "posix", 5) != 0)
goto unknown;
cp += 4;
do_posix = do_unix = 1;
break;
case 'l':
case 'L':
if (strncasecmp(cp, "lint", 4) != 0)
goto unknown;
cp += 3;
do_lint = 1;
break;
case 'H':
case 'h':
if (strncasecmp(cp, "help", 4) != 0)
goto unknown;
cp += 3;
usage(0);
break;
case 'U':
case 'u':
if (strncasecmp(cp, "usage", 5) != 0)
goto unknown;
cp += 4;
usage(0);
break;
case 's':
case 'S':
if (strncasecmp(cp, "source=", 7) != 0)
goto unknown;
cp += 7;
if (cp[0] == '\0')
warning("empty argument to -Wsource ignored");
else {
srcfiles[++numfiles].stype = CMDLINE;
srcfiles[numfiles].val = cp;
return;
}
break;
default:
unknown:
fprintf(stderr, "'%c' -- unknown option, ignored\n",
*cp);
break;
}
}
}
/* 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()
{
fprintf(stderr, "%s, patchlevel %d\n", version_string, PATCHLEVEL);
/* per GNU coding standards, exit successfully, do nothing else */
exit(0);
}
/* this mess will improve in 2.16 */
char *
gawk_name(filespec)
char *filespec;
{
char *p;
#ifdef VMS /* "device:[root.][directory.subdir]GAWK.EXE;n" -> "GAWK" */
char *q;
p = strrchr(filespec, ']'); /* directory punctuation */
q = strrchr(filespec, '>'); /* alternate <international> punct */
if (p == NULL || q > p) p = q;
p = strdup(p == NULL ? filespec : (p + 1));
if ((q = strrchr(p, '.')) != NULL) *q = '\0'; /* strip .typ;vers */
return p;
#endif /*VMS*/
#if defined(MSDOS) || defined(OS2) || defined(atarist)
char *q;
for (p = filespec; (p = strchr(p, '\\')); *p = '/')
;
p = filespec;
if ((q = strrchr(p, '/')))
p = q + 1;
if ((q = strchr(p, '.')))
*q = '\0';
strlwr(p);
return (p == NULL ? filespec : p);
#endif /* MSDOS || atarist */
/* "path/name" -> "name" */
p = strrchr(filespec, '/');
return (p == NULL ? filespec : p + 1);
}
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