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freebsd-dev/contrib/awk/io.c
James Raynard 728510ce91 Virgin import of GNU awk 3.0.3
1997-10-14 18:17:11 +00:00

1942 lines
45 KiB
C
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/*
* io.c --- routines for dealing with input and output and records
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-1997 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
*/
#include "awk.h"
#undef HAVE_MMAP /* for now, probably forever */
#ifdef HAVE_SYS_PARAM_H
#undef RE_DUP_MAX /* avoid spurious conflict w/regex.h */
#include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif /* HAVE_SYS_WAIT_H */
#ifdef HAVE_MMAP
#include <sys/mman.h>
#ifndef MAP_FAILED
#define MAP_FAILED ((caddr_t) -1)
#endif /* ! defined (MAP_FAILED) */
#endif /* HAVE_MMAP */
#ifndef O_RDONLY
#include <fcntl.h>
#endif
#ifndef O_ACCMODE
#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
#endif
#include <assert.h>
#if ! defined(S_ISREG) && defined(S_IFREG)
#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
#endif
#if ! defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
#ifndef ENFILE
#define ENFILE EMFILE
#endif
#ifdef atarist
#include <stddef.h>
#endif
#if defined(MSDOS) || defined(OS2) || defined(WIN32)
#define PIPES_SIMULATED
#endif
static IOBUF *nextfile P((int skipping));
static int inrec P((IOBUF *iop));
static int iop_close P((IOBUF *iop));
struct redirect *redirect P((NODE *tree, int *errflg));
static void close_one P((void));
static int close_redir P((struct redirect *rp, int exitwarn));
#ifndef PIPES_SIMULATED
static int wait_any P((int interesting));
#endif
static IOBUF *gawk_popen P((char *cmd, struct redirect *rp));
static IOBUF *iop_open P((const char *file, const char *how, IOBUF *buf));
static IOBUF *iop_alloc P((int fd, const char *name, IOBUF *buf));
static int gawk_pclose P((struct redirect *rp));
static int do_pathopen P((const char *file));
static int get_a_record P((char **out, IOBUF *iop, int rs, Regexp *RSre, int *errcode));
#ifdef HAVE_MMAP
static int mmap_get_record P((char **out, IOBUF *iop, int rs, Regexp *RSre, int *errcode));
#endif /* HAVE_MMAP */
static int str2mode P((const char *mode));
static void spec_setup P((IOBUF *iop, int len, int allocate));
static int specfdopen P((IOBUF *iop, const char *name, const char *mode));
static int pidopen P((IOBUF *iop, const char *name, const char *mode));
static int useropen P((IOBUF *iop, const char *name, const char *mode));
#if defined (MSDOS) && !defined (__GO32__)
#include "popen.h"
#define popen(c, m) os_popen(c, m)
#define pclose(f) os_pclose(f)
#else
#if defined (OS2) /* OS/2, but not family mode */
#if defined (_MSC_VER)
#define popen(c, m) _popen(c, m)
#define pclose(f) _pclose(f)
#endif
#else
extern FILE *popen();
#endif
#endif
static struct redirect *red_head = NULL;
static NODE *RS;
static Regexp *RS_regexp;
int RS_is_null;
extern int output_is_tty;
extern NODE *ARGC_node;
extern NODE *ARGV_node;
extern NODE *ARGIND_node;
extern NODE *ERRNO_node;
extern NODE **fields_arr;
static jmp_buf filebuf; /* for do_nextfile() */
/* do_nextfile --- implement gawk "nextfile" extension */
void
do_nextfile()
{
(void) nextfile(TRUE);
longjmp(filebuf, 1);
}
/* nextfile --- move to the next input data file */
static IOBUF *
nextfile(skipping)
int skipping;
{
static long i = 1;
static int files = 0;
NODE *arg;
static IOBUF *curfile = NULL;
static IOBUF mybuf;
const char *fname;
if (skipping) {
if (curfile != NULL)
iop_close(curfile);
curfile = NULL;
return NULL;
}
if (curfile != NULL) {
if (curfile->cnt == EOF) {
(void) iop_close(curfile);
curfile = NULL;
} else
return curfile;
}
for (; i < (long) (ARGC_node->lnode->numbr); i++) {
arg = *assoc_lookup(ARGV_node, tmp_number((AWKNUM) i));
if (arg->stlen == 0)
continue;
arg->stptr[arg->stlen] = '\0';
if (! do_traditional) {
unref(ARGIND_node->var_value);
ARGIND_node->var_value = make_number((AWKNUM) i);
}
if (! arg_assign(arg->stptr)) {
files++;
fname = arg->stptr;
curfile = iop_open(fname, "r", &mybuf);
if (curfile == NULL)
goto give_up;
curfile->flag |= IOP_NOFREE_OBJ;
/* This is a kludge. */
unref(FILENAME_node->var_value);
FILENAME_node->var_value = dupnode(arg);
FNR = 0;
i++;
break;
}
}
if (files == 0) {
files++;
/* no args. -- use stdin */
/* FNR is init'ed to 0 */
FILENAME_node->var_value = make_string("-", 1);
fname = "-";
curfile = iop_open(fname, "r", &mybuf);
if (curfile == NULL)
goto give_up;
curfile->flag |= IOP_NOFREE_OBJ;
}
return curfile;
give_up:
fatal("cannot open file `%s' for reading (%s)",
fname, strerror(errno));
/* NOTREACHED */
return 0;
}
/* set_FNR --- update internal FNR from awk variable */
void
set_FNR()
{
FNR = (long) FNR_node->var_value->numbr;
}
/* set_NR --- update internal NR from awk variable */
void
set_NR()
{
NR = (long) NR_node->var_value->numbr;
}
/* inrec --- This reads in a record from the input file */
static int
inrec(iop)
IOBUF *iop;
{
char *begin;
register int cnt;
int retval = 0;
if ((cnt = iop->cnt) != EOF)
cnt = (*(iop->getrec))
(&begin, iop, RS->stptr[0], RS_regexp, NULL);
if (cnt == EOF) {
cnt = 0;
retval = 1;
} else {
NR += 1;
FNR += 1;
set_record(begin, cnt, TRUE);
}
return retval;
}
/* iop_close --- close an open IOP */
static int
iop_close(iop)
IOBUF *iop;
{
int ret;
if (iop == NULL)
return 0;
errno = 0;
#ifdef _CRAY
/* Work around bug in UNICOS popen */
if (iop->fd < 3)
ret = 0;
else
#endif
/* save these for re-use; don't free the storage */
if ((iop->flag & IOP_IS_INTERNAL) != 0) {
iop->off = iop->buf;
iop->end = iop->buf + strlen(iop->buf);
iop->cnt = 0;
iop->secsiz = 0;
return 0;
}
/* Don't close standard files or else crufty code elsewhere will lose */
if (iop->fd == fileno(stdin)
|| iop->fd == fileno(stdout)
|| iop->fd == fileno(stderr)
|| (iop->flag & IOP_MMAPPED) != 0)
ret = 0;
else
ret = close(iop->fd);
if (ret == -1)
warning("close of fd %d (`%s') failed (%s)", iop->fd,
iop->name, strerror(errno));
if ((iop->flag & IOP_NO_FREE) == 0) {
/*
* Be careful -- $0 may still reference the buffer even though
* an explicit close is being done; in the future, maybe we
* can do this a bit better.
*/
if (iop->buf) {
if ((fields_arr[0]->stptr >= iop->buf)
&& (fields_arr[0]->stptr < (iop->buf + iop->secsiz + iop->size))) {
NODE *t;
t = make_string(fields_arr[0]->stptr,
fields_arr[0]->stlen);
unref(fields_arr[0]);
fields_arr[0] = t;
reset_record();
}
if ((iop->flag & IOP_MMAPPED) == 0)
free(iop->buf);
#ifdef HAVE_MMAP
else
(void) munmap(iop->buf, iop->size);
#endif
}
if ((iop->flag & IOP_NOFREE_OBJ) == 0)
free((char *) iop);
}
return ret == -1 ? 1 : 0;
}
/* do_input --- the main input processing loop */
void
do_input()
{
IOBUF *iop;
extern int exiting;
(void) setjmp(filebuf); /* for `nextfile' */
while ((iop = nextfile(FALSE)) != NULL) {
if (inrec(iop) == 0)
while (interpret(expression_value) && inrec(iop) == 0)
continue;
#ifdef C_ALLOCA
/* recover any space from C based alloca */
(void) alloca(0);
#endif
if (exiting)
break;
}
}
/* redirect --- Redirection for printf and print commands */
struct redirect *
redirect(tree, errflg)
NODE *tree;
int *errflg;
{
register NODE *tmp;
register struct redirect *rp;
register char *str;
int tflag = 0;
int outflag = 0;
const char *direction = "to";
const char *mode;
int fd;
const char *what = NULL;
switch (tree->type) {
case Node_redirect_append:
tflag = RED_APPEND;
/* FALL THROUGH */
case Node_redirect_output:
outflag = (RED_FILE|RED_WRITE);
tflag |= outflag;
if (tree->type == Node_redirect_output)
what = ">";
else
what = ">>";
break;
case Node_redirect_pipe:
tflag = (RED_PIPE|RED_WRITE);
what = "|";
break;
case Node_redirect_pipein:
tflag = (RED_PIPE|RED_READ);
what = "|";
break;
case Node_redirect_input:
tflag = (RED_FILE|RED_READ);
what = "<";
break;
default:
fatal("invalid tree type %d in redirect()", tree->type);
break;
}
tmp = tree_eval(tree->subnode);
if (do_lint && (tmp->flags & STR) == 0)
warning("expression in `%s' redirection only has numeric value",
what);
tmp = force_string(tmp);
str = tmp->stptr;
if (str == NULL || *str == '\0')
fatal("expression for `%s' redirection has null string value",
what);
if (do_lint
&& (STREQN(str, "0", tmp->stlen) || STREQN(str, "1", tmp->stlen)))
warning("filename `%s' for `%s' redirection may be result of logical expression", str, what);
for (rp = red_head; rp != NULL; rp = rp->next)
if (strlen(rp->value) == tmp->stlen
&& STREQN(rp->value, str, tmp->stlen)
&& ((rp->flag & ~(RED_NOBUF|RED_EOF)) == tflag
|| (outflag != 0
&& (rp->flag & (RED_FILE|RED_WRITE)) == outflag)))
break;
if (rp == NULL) {
emalloc(rp, struct redirect *, sizeof(struct redirect),
"redirect");
emalloc(str, char *, tmp->stlen+1, "redirect");
memcpy(str, tmp->stptr, tmp->stlen);
str[tmp->stlen] = '\0';
rp->value = str;
rp->flag = tflag;
rp->fp = NULL;
rp->iop = NULL;
rp->pid = 0; /* unlikely that we're worried about init */
rp->status = 0;
/* maintain list in most-recently-used first order */
if (red_head != NULL)
red_head->prev = rp;
rp->prev = NULL;
rp->next = red_head;
red_head = rp;
} else
str = rp->value; /* get \0 terminated string */
while (rp->fp == NULL && rp->iop == NULL) {
if (rp->flag & RED_EOF)
/*
* encountered EOF on file or pipe -- must be cleared
* by explicit close() before reading more
*/
return rp;
mode = NULL;
errno = 0;
switch (tree->type) {
case Node_redirect_output:
mode = "w";
if ((rp->flag & RED_USED) != 0)
mode = "a";
break;
case Node_redirect_append:
mode = "a";
break;
case Node_redirect_pipe:
/* synchronize output before new pipe */
(void) flush_io();
if ((rp->fp = popen(str, "w")) == NULL)
fatal("can't open pipe (\"%s\") for output (%s)",
str, strerror(errno));
rp->flag |= RED_NOBUF;
break;
case Node_redirect_pipein:
direction = "from";
if (gawk_popen(str, rp) == NULL)
fatal("can't open pipe (\"%s\") for input (%s)",
str, strerror(errno));
break;
case Node_redirect_input:
direction = "from";
rp->iop = iop_open(str, "r", NULL);
break;
default:
cant_happen();
}
if (mode != NULL) {
errno = 0;
fd = devopen(str, mode);
if (fd > INVALID_HANDLE) {
if (fd == fileno(stdin))
rp->fp = stdin;
else if (fd == fileno(stdout))
rp->fp = stdout;
else if (fd == fileno(stderr))
rp->fp = stderr;
else {
rp->fp = fdopen(fd, (char *) mode);
/* don't leak file descriptors */
if (rp->fp == NULL)
close(fd);
}
if (rp->fp != NULL && isatty(fd))
rp->flag |= RED_NOBUF;
}
}
if (rp->fp == NULL && rp->iop == NULL) {
/* too many files open -- close one and try again */
if (errno == EMFILE || errno == ENFILE)
close_one();
#ifdef HAVE_MMAP
/* this works for solaris 2.5, not sunos */
else if (errno == 0) /* HACK! */
close_one();
#endif
else {
/*
* Some other reason for failure.
*
* On redirection of input from a file,
* just return an error, so e.g. getline
* can return -1. For output to file,
* complain. The shell will complain on
* a bad command to a pipe.
*/
if (errflg != NULL)
*errflg = errno;
if (tree->type == Node_redirect_output
|| tree->type == Node_redirect_append)
fatal("can't redirect %s `%s' (%s)",
direction, str, strerror(errno));
else {
free_temp(tmp);
return NULL;
}
}
}
}
free_temp(tmp);
return rp;
}
/* getredirect --- find the struct redirect for this file or pipe */
struct redirect *
getredirect(str, len)
char *str;
int len;
{
struct redirect *rp;
for (rp = red_head; rp != NULL; rp = rp->next)
if (strlen(rp->value) == len && STREQN(rp->value, str, len))
return rp;
return NULL;
}
/* close_one --- temporarily close an open file to re-use the fd */
static void
close_one()
{
register struct redirect *rp;
register struct redirect *rplast = NULL;
/* go to end of list first, to pick up least recently used entry */
for (rp = red_head; rp != NULL; rp = rp->next)
rplast = rp;
/* now work back up through the list */
for (rp = rplast; rp != NULL; rp = rp->prev)
if (rp->fp != NULL && (rp->flag & RED_FILE) != 0) {
rp->flag |= RED_USED;
errno = 0;
if (/* do_lint && */ fclose(rp->fp) != 0)
warning("close of \"%s\" failed (%s).",
rp->value, strerror(errno));
rp->fp = NULL;
break;
}
if (rp == NULL)
/* surely this is the only reason ??? */
fatal("too many pipes or input files open");
}
/* do_close --- completely close an open file or pipe */
NODE *
do_close(tree)
NODE *tree;
{
NODE *tmp;
register struct redirect *rp;
tmp = force_string(tree_eval(tree->subnode));
/* icky special case: close(FILENAME) called. */
if (tree->subnode == FILENAME_node
|| (tmp->stlen == FILENAME_node->var_value->stlen
&& STREQN(tmp->stptr, FILENAME_node->var_value->stptr, tmp->stlen))) {
(void) nextfile(TRUE);
free_temp(tmp);
return tmp_number((AWKNUM) 0.0);
}
for (rp = red_head; rp != NULL; rp = rp->next) {
if (strlen(rp->value) == tmp->stlen
&& STREQN(rp->value, tmp->stptr, tmp->stlen))
break;
}
if (rp == NULL) { /* no match */
if (do_lint)
warning("close: `%.*s' is not an open file or pipe",
tmp->stlen, tmp->stptr);
free_temp(tmp);
return tmp_number((AWKNUM) 0.0);
}
free_temp(tmp);
fflush(stdout); /* synchronize regular output */
tmp = tmp_number((AWKNUM) close_redir(rp, FALSE));
rp = NULL;
return tmp;
}
/* close_redir --- close an open file or pipe */
static int
close_redir(rp, exitwarn)
register struct redirect *rp;
int exitwarn;
{
int status = 0;
char *what;
if (rp == NULL)
return 0;
if (rp->fp == stdout || rp->fp == stderr)
return 0;
errno = 0;
if ((rp->flag & (RED_PIPE|RED_WRITE)) == (RED_PIPE|RED_WRITE))
status = pclose(rp->fp);
else if (rp->fp != NULL)
status = fclose(rp->fp);
else if (rp->iop != NULL) {
if ((rp->flag & RED_PIPE) != 0)
status = gawk_pclose(rp);
else {
status = iop_close(rp->iop);
rp->iop = NULL;
}
}
what = ((rp->flag & RED_PIPE) != 0) ? "pipe" : "file";
if (exitwarn)
warning("no explicit close of %s `%s' provided",
what, rp->value);
/* SVR4 awk checks and warns about status of close */
if (status != 0) {
char *s = strerror(errno);
/*
* Too many people have complained about this.
* As of 2.15.6, it is now under lint control.
*/
if (do_lint)
warning("failure status (%d) on %s close of \"%s\" (%s)",
status, what, rp->value, s);
if (! do_traditional) {
/* set ERRNO too so that program can get at it */
unref(ERRNO_node->var_value);
ERRNO_node->var_value = make_string(s, strlen(s));
}
}
if (rp->next != NULL)
rp->next->prev = rp->prev;
if (rp->prev != NULL)
rp->prev->next = rp->next;
else
red_head = rp->next;
free(rp->value);
free((char *) rp);
return status;
}
/* flush_io --- flush all open output files */
int
flush_io()
{
register struct redirect *rp;
int status = 0;
errno = 0;
if (fflush(stdout)) {
warning("error writing standard output (%s)", strerror(errno));
status++;
}
if (fflush(stderr)) {
warning("error writing standard error (%s)", strerror(errno));
status++;
}
for (rp = red_head; rp != NULL; rp = rp->next)
/* flush both files and pipes, what the heck */
if ((rp->flag & RED_WRITE) && rp->fp != NULL) {
if (fflush(rp->fp)) {
warning("%s flush of \"%s\" failed (%s).",
(rp->flag & RED_PIPE) ? "pipe" :
"file", rp->value, strerror(errno));
status++;
}
}
return status;
}
/* close_io --- close all open files, called when exiting */
int
close_io()
{
register struct redirect *rp;
register struct redirect *next;
int status = 0;
errno = 0;
for (rp = red_head; rp != NULL; rp = next) {
next = rp->next;
/*
* close_redir() will print a message if needed
* if do_lint, warn about lack of explicit close
*/
if (close_redir(rp, do_lint))
status++;
rp = NULL;
}
/*
* Some of the non-Unix os's have problems doing an fclose
* on stdout and stderr. Since we don't really need to close
* them, we just flush them, and do that across the board.
*/
if (fflush(stdout)) {
warning("error writing standard output (%s)", strerror(errno));
status++;
}
if (fflush(stderr)) {
warning("error writing standard error (%s)", strerror(errno));
status++;
}
return status;
}
/* str2mode --- convert a string mode to an integer mode */
static int
str2mode(mode)
const char *mode;
{
int ret;
switch(mode[0]) {
case 'r':
ret = O_RDONLY;
break;
case 'w':
ret = O_WRONLY|O_CREAT|O_TRUNC;
break;
case 'a':
ret = O_WRONLY|O_APPEND|O_CREAT;
break;
default:
ret = 0; /* lint */
cant_happen();
}
return ret;
}
/* devopen --- handle /dev/std{in,out,err}, /dev/fd/N, regular files */
/*
* This separate version is still needed for output, since file and pipe
* output is done with stdio. iop_open() handles input with IOBUFs of
* more "special" files. Those files are not handled here since it makes
* no sense to use them for output.
*/
int
devopen(name, mode)
const char *name, *mode;
{
int openfd;
const char *cp;
char *ptr;
int flag = 0;
struct stat buf;
extern double strtod();
flag = str2mode(mode);
if (STREQ(name, "-"))
openfd = fileno(stdin);
else
openfd = INVALID_HANDLE;
if (do_traditional)
goto strictopen;
if ((openfd = os_devopen(name, flag)) >= 0)
return openfd;
if (STREQN(name, "/dev/", 5) && stat((char *) name, &buf) == -1) {
cp = name + 5;
if (STREQ(cp, "stdin") && (flag & O_ACCMODE) == O_RDONLY)
openfd = fileno(stdin);
else if (STREQ(cp, "stdout") && (flag & O_ACCMODE) == O_WRONLY)
openfd = fileno(stdout);
else if (STREQ(cp, "stderr") && (flag & O_ACCMODE) == O_WRONLY)
openfd = fileno(stderr);
else if (STREQN(cp, "fd/", 3)) {
cp += 3;
openfd = (int) strtod(cp, &ptr);
if (openfd <= INVALID_HANDLE || ptr == cp)
openfd = INVALID_HANDLE;
}
}
strictopen:
if (openfd == INVALID_HANDLE)
openfd = open(name, flag, 0666);
if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0)
if (S_ISDIR(buf.st_mode))
fatal("file `%s' is a directory", name);
return openfd;
}
/* spec_setup --- setup an IOBUF for a special internal file */
static void
spec_setup(iop, len, allocate)
IOBUF *iop;
int len;
int allocate;
{
char *cp;
if (allocate) {
emalloc(cp, char *, len+2, "spec_setup");
iop->buf = cp;
} else {
len = strlen(iop->buf);
iop->buf[len++] = '\n'; /* get_a_record clobbered it */
iop->buf[len] = '\0'; /* just in case */
}
iop->off = iop->buf;
iop->cnt = 0;
iop->secsiz = 0;
iop->size = len;
iop->end = iop->buf + len;
iop->fd = -1;
iop->flag = IOP_IS_INTERNAL;
iop->getrec = get_a_record;
}
/* specfdopen --- open an fd special file */
static int
specfdopen(iop, name, mode)
IOBUF *iop;
const char *name, *mode;
{
int fd;
IOBUF *tp;
fd = devopen(name, mode);
if (fd == INVALID_HANDLE)
return INVALID_HANDLE;
tp = iop_alloc(fd, name, NULL);
if (tp == NULL) {
/* don't leak fd's */
close(fd);
return INVALID_HANDLE;
}
*iop = *tp;
iop->flag |= IOP_NO_FREE;
free(tp);
return 0;
}
#ifdef GETPGRP_VOID
#define getpgrp_arg() /* nothing */
#else
#define getpgrp_arg() getpid()
#endif
/* pidopen --- "open" /dev/pid, /dev/ppid, and /dev/pgrpid */
static int
pidopen(iop, name, mode)
IOBUF *iop;
const char *name, *mode;
{
char tbuf[BUFSIZ];
int i;
if (name[6] == 'g')
sprintf(tbuf, "%d\n", getpgrp(getpgrp_arg()));
else if (name[6] == 'i')
sprintf(tbuf, "%d\n", getpid());
else
sprintf(tbuf, "%d\n", getppid());
i = strlen(tbuf);
spec_setup(iop, i, TRUE);
strcpy(iop->buf, tbuf);
return 0;
}
/* useropen --- "open" /dev/user */
/*
* /dev/user creates a record as follows:
* $1 = getuid()
* $2 = geteuid()
* $3 = getgid()
* $4 = getegid()
* If multiple groups are supported, then $5 through $NF are the
* supplementary group set.
*/
static int
useropen(iop, name, mode)
IOBUF *iop;
const char *name, *mode;
{
char tbuf[BUFSIZ], *cp;
int i;
#if defined(NGROUPS_MAX) && NGROUPS_MAX > 0
GETGROUPS_T groupset[NGROUPS_MAX];
int ngroups;
#endif
sprintf(tbuf, "%d %d %d %d", getuid(), geteuid(), getgid(), getegid());
cp = tbuf + strlen(tbuf);
#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++) {
*cp++ = ' ';
sprintf(cp, "%d", (int) groupset[i]);
cp += strlen(cp);
}
#endif
*cp++ = '\n';
*cp++ = '\0';
i = strlen(tbuf);
spec_setup(iop, i, TRUE);
strcpy(iop->buf, tbuf);
return 0;
}
/* iop_open --- handle special and regular files for input */
static IOBUF *
iop_open(name, mode, iop)
const char *name, *mode;
IOBUF *iop;
{
int openfd = INVALID_HANDLE;
int flag = 0;
struct stat buf;
static struct internal {
const char *name;
int compare;
int (*fp) P((IOBUF *, const char *, const char *));
IOBUF iob;
} table[] = {
{ "/dev/fd/", 8, specfdopen },
{ "/dev/stdin", 10, specfdopen },
{ "/dev/stdout", 11, specfdopen },
{ "/dev/stderr", 11, specfdopen },
{ "/dev/pid", 8, pidopen },
{ "/dev/ppid", 9, pidopen },
{ "/dev/pgrpid", 11, pidopen },
{ "/dev/user", 9, useropen },
};
int devcount = sizeof(table) / sizeof(table[0]);
flag = str2mode(mode);
/*
* FIXME: remove the stat call, and always process these files
* internally.
*/
if (STREQ(name, "-"))
openfd = fileno(stdin);
else if (do_traditional)
goto strictopen;
else if (STREQN(name, "/dev/", 5) && stat((char *) name, &buf) == -1) {
int i;
for (i = 0; i < devcount; i++) {
if (STREQN(name, table[i].name, table[i].compare)) {
iop = & table[i].iob;
if (iop->buf != NULL) {
spec_setup(iop, 0, FALSE);
return iop;
} else if ((*table[i].fp)(iop, name, mode) == 0)
return iop;
else {
warning("could not open %s, mode `%s'",
name, mode);
return NULL;
}
}
}
}
strictopen:
if (openfd == INVALID_HANDLE)
openfd = open(name, flag, 0666);
if (openfd != INVALID_HANDLE && fstat(openfd, &buf) > 0)
if ((buf.st_mode & S_IFMT) == S_IFDIR)
fatal("file `%s' is a directory", name);
return iop_alloc(openfd, name, iop);
}
#ifndef PIPES_SIMULATED /* real pipes */
/* wait_any --- wait for a child process, close associated pipe */
static int
wait_any(interesting)
int interesting; /* pid of interest, if any */
{
RETSIGTYPE (*hstat)(), (*istat)(), (*qstat)();
int pid;
int status = 0;
struct redirect *redp;
extern int errno;
hstat = signal(SIGHUP, SIG_IGN);
istat = signal(SIGINT, SIG_IGN);
qstat = signal(SIGQUIT, SIG_IGN);
for (;;) {
#ifdef HAVE_SYS_WAIT_H /* Posix compatible sys/wait.h */
pid = wait(&status);
#else
pid = wait((union wait *)&status);
#endif /* NeXT */
if (interesting && pid == interesting) {
break;
} else if (pid != -1) {
for (redp = red_head; redp != NULL; redp = redp->next)
if (pid == redp->pid) {
redp->pid = -1;
redp->status = status;
break;
}
}
if (pid == -1 && errno == ECHILD)
break;
}
signal(SIGHUP, hstat);
signal(SIGINT, istat);
signal(SIGQUIT, qstat);
return(status);
}
/* gawk_popen --- open an IOBUF on a child process */
static IOBUF *
gawk_popen(cmd, rp)
char *cmd;
struct redirect *rp;
{
int p[2];
register int pid;
/*
* used to wait for any children to synchronize input and output,
* but this could cause gawk to hang when it is started in a pipeline
* and thus has a child process feeding it input (shell dependant)
*/
/*(void) wait_any(0);*/ /* wait for outstanding processes */
if (pipe(p) < 0)
fatal("cannot open pipe \"%s\" (%s)", cmd, strerror(errno));
if ((pid = fork()) == 0) {
if (close(1) == -1)
fatal("close of stdout in child failed (%s)",
strerror(errno));
if (dup(p[1]) != 1)
fatal("dup of pipe failed (%s)", strerror(errno));
if (close(p[0]) == -1 || close(p[1]) == -1)
fatal("close of pipe failed (%s)", strerror(errno));
execl("/bin/sh", "sh", "-c", cmd, NULL);
_exit(127);
}
if (pid == -1)
fatal("cannot fork for \"%s\" (%s)", cmd, strerror(errno));
rp->pid = pid;
if (close(p[1]) == -1)
fatal("close of pipe failed (%s)", strerror(errno));
rp->iop = iop_alloc(p[0], cmd, NULL);
if (rp->iop == NULL)
(void) close(p[0]);
return (rp->iop);
}
/* gawk_pclose --- close an open child pipe */
static int
gawk_pclose(rp)
struct redirect *rp;
{
(void) iop_close(rp->iop);
rp->iop = NULL;
/* process previously found, return stored status */
if (rp->pid == -1)
return (rp->status >> 8) & 0xFF;
rp->status = wait_any(rp->pid);
rp->pid = -1;
return (rp->status >> 8) & 0xFF;
}
#else /* PIPES_SIMULATED */
/*
* use temporary file rather than pipe
* except if popen() provides real pipes too
*/
#if defined(VMS) || defined(OS2) || defined (MSDOS)
/* gawk_popen --- open an IOBUF on a child process */
static IOBUF *
gawk_popen(cmd, rp)
char *cmd;
struct redirect *rp;
{
FILE *current;
if ((current = popen(cmd, "r")) == NULL)
return NULL;
rp->iop = iop_alloc(fileno(current), cmd, NULL);
if (rp->iop == NULL) {
(void) fclose(current);
current = NULL;
}
rp->ifp = current;
return (rp->iop);
}
/* gawk_pclose --- close an open child pipe */
static int
gawk_pclose(rp)
struct redirect *rp;
{
int rval, aval, fd = rp->iop->fd;
rp->iop->fd = dup(fd); /* kludge to allow close() + pclose() */
rval = iop_close(rp->iop);
rp->iop = NULL;
aval = pclose(rp->ifp);
rp->ifp = NULL;
return (rval < 0 ? rval : aval);
}
#else /* not (VMS || OS2 || MSDOS) */
static struct pipeinfo {
char *command;
char *name;
} pipes[_NFILE];
/* gawk_popen --- open an IOBUF on a child process */
static IOBUF *
gawk_popen(cmd, rp)
char *cmd;
struct redirect *rp;
{
extern char *strdup P((const char *));
int current;
char *name;
static char cmdbuf[256];
/* get a name to use */
if ((name = tempnam(".", "pip")) == NULL)
return NULL;
sprintf(cmdbuf, "%s > %s", cmd, name);
system(cmdbuf);
if ((current = open(name, O_RDONLY)) == INVALID_HANDLE)
return NULL;
pipes[current].name = name;
pipes[current].command = strdup(cmd);
rp->iop = iop_alloc(current, name, NULL);
if (rp->iop == NULL)
(void) close(current);
return (rp->iop);
}
/* gawk_pclose --- close an open child pipe */
static int
gawk_pclose(rp)
struct redirect *rp;
{
int cur = rp->iop->fd;
int rval;
rval = iop_close(rp->iop);
rp->iop = NULL;
/* check for an open file */
if (pipes[cur].name == NULL)
return -1;
unlink(pipes[cur].name);
free(pipes[cur].name);
pipes[cur].name = NULL;
free(pipes[cur].command);
return rval;
}
#endif /* not (VMS || OS2 || MSDOS) */
#endif /* PIPES_SIMULATED */
/* do_getline --- read in a line, into var and with redirection, as needed */
NODE *
do_getline(tree)
NODE *tree;
{
struct redirect *rp = NULL;
IOBUF *iop;
int cnt = EOF;
char *s = NULL;
int errcode;
while (cnt == EOF) {
if (tree->rnode == NULL) { /* no redirection */
iop = nextfile(FALSE);
if (iop == NULL) /* end of input */
return tmp_number((AWKNUM) 0.0);
} else {
int redir_error = 0;
rp = redirect(tree->rnode, &redir_error);
if (rp == NULL && redir_error) { /* failed redirect */
if (! do_traditional) {
s = strerror(redir_error);
unref(ERRNO_node->var_value);
ERRNO_node->var_value =
make_string(s, strlen(s));
}
return tmp_number((AWKNUM) -1.0);
}
iop = rp->iop;
if (iop == NULL) /* end of input */
return tmp_number((AWKNUM) 0.0);
}
errcode = 0;
cnt = (*(iop->getrec))(&s, iop, RS->stptr[0], RS_regexp, &errcode);
if (errcode != 0) {
if (! do_traditional) {
s = strerror(errcode);
unref(ERRNO_node->var_value);
ERRNO_node->var_value = make_string(s, strlen(s));
}
return tmp_number((AWKNUM) -1.0);
}
if (cnt == EOF) {
if (rp != NULL) {
/*
* Don't do iop_close() here if we are
* reading from a pipe; otherwise
* gawk_pclose will not be called.
*/
if ((rp->flag & RED_PIPE) == 0) {
(void) iop_close(iop);
rp->iop = NULL;
}
rp->flag |= RED_EOF; /* sticky EOF */
return tmp_number((AWKNUM) 0.0);
} else
continue; /* try another file */
}
if (rp == NULL) {
NR++;
FNR++;
}
if (tree->lnode == NULL) /* no optional var. */
set_record(s, cnt, TRUE);
else { /* assignment to variable */
Func_ptr after_assign = NULL;
NODE **lhs;
lhs = get_lhs(tree->lnode, &after_assign);
unref(*lhs);
*lhs = make_string(s, cnt);
(*lhs)->flags |= MAYBE_NUM;
/* we may have to regenerate $0 here! */
if (after_assign != NULL)
(*after_assign)();
}
}
return tmp_number((AWKNUM) 1.0);
}
/* pathopen --- pathopen with default file extension handling */
int
pathopen(file)
const char *file;
{
int fd = do_pathopen(file);
#ifdef DEFAULT_FILETYPE
if (! do_traditional && fd <= INVALID_HANDLE) {
char *file_awk;
int save = errno;
#ifdef VMS
int vms_save = vaxc$errno;
#endif
/* append ".awk" and try again */
emalloc(file_awk, char *, strlen(file) +
sizeof(DEFAULT_FILETYPE) + 1, "pathopen");
sprintf(file_awk, "%s%s", file, DEFAULT_FILETYPE);
fd = do_pathopen(file_awk);
free(file_awk);
if (fd <= INVALID_HANDLE) {
errno = save;
#ifdef VMS
vaxc$errno = vms_save;
#endif
}
}
#endif /*DEFAULT_FILETYPE*/
return fd;
}
/* do_pathopen --- search $AWKPATH for source file */
static int
do_pathopen(file)
const char *file;
{
static const char *savepath = NULL;
static int first = TRUE;
const char *awkpath;
char *cp, trypath[BUFSIZ];
int fd;
if (STREQ(file, "-"))
return (0);
if (do_traditional)
return (devopen(file, "r"));
if (first) {
first = FALSE;
if ((awkpath = getenv("AWKPATH")) != NULL && *awkpath)
savepath = awkpath; /* used for restarting */
else
savepath = defpath;
}
awkpath = savepath;
/* some kind of path name, no search */
if (ispath(file))
return (devopen(file, "r"));
do {
trypath[0] = '\0';
/* this should take into account limits on size of trypath */
for (cp = trypath; *awkpath && *awkpath != envsep; )
*cp++ = *awkpath++;
if (cp != trypath) { /* nun-null element in path */
/* add directory punctuation only if needed */
if (! isdirpunct(*(cp-1)))
*cp++ = '/';
/* append filename */
strcpy(cp, file);
} else
strcpy(trypath, file);
if ((fd = devopen(trypath, "r")) > INVALID_HANDLE)
return (fd);
/* no luck, keep going */
if(*awkpath == envsep && awkpath[1] != '\0')
awkpath++; /* skip colon */
} while (*awkpath != '\0');
/*
* You might have one of the awk paths defined, WITHOUT the current
* working directory in it. Therefore try to open the file in the
* current directory.
*/
return (devopen(file, "r"));
}
#ifdef TEST
int bufsize = 8192;
void
fatal(s)
char *s;
{
printf("%s\n", s);
exit(1);
}
#endif
/* iop_alloc --- allocate an IOBUF structure for an open fd */
static IOBUF *
iop_alloc(fd, name, iop)
int fd;
const char *name;
IOBUF *iop;
{
struct stat sbuf;
if (fd == INVALID_HANDLE)
return NULL;
if (iop == NULL)
emalloc(iop, IOBUF *, sizeof(IOBUF), "iop_alloc");
iop->flag = 0;
if (isatty(fd))
iop->flag |= IOP_IS_TTY;
iop->size = optimal_bufsize(fd, & sbuf);
if (do_lint && S_ISREG(sbuf.st_mode) && sbuf.st_size == 0)
warning("data file `%s' is empty", name);
iop->secsiz = -2;
errno = 0;
iop->fd = fd;
iop->off = iop->buf = NULL;
iop->cnt = 0;
iop->name = name;
iop->getrec = get_a_record;
#ifdef HAVE_MMAP
if (S_ISREG(sbuf.st_mode) && sbuf.st_size > 0) {
register char *cp;
iop->buf = iop->off = mmap((caddr_t) 0, sbuf.st_size,
PROT_READ|PROT_WRITE, MAP_PRIVATE,
fd, 0L);
/* cast is for buggy compilers (e.g. DEC OSF/1) */
if (iop->buf == (caddr_t)MAP_FAILED) {
iop->buf = iop->off = NULL;
goto out;
}
iop->flag |= IOP_MMAPPED;
iop->size = sbuf.st_size;
iop->secsiz = 0;
iop->end = iop->buf + iop->size;
iop->cnt = sbuf.st_size;
iop->getrec = mmap_get_record;
(void) close(fd);
iop->fd = INVALID_HANDLE;
#if defined(HAVE_MADVISE) && defined(MADV_SEQUENTIAL)
madvise(iop->buf, iop->size, MADV_SEQUENTIAL);
#endif
/*
* The following is a really gross hack.
* We want to ensure that we have a copy of the input
* data that won't go away, on the off chance that someone
* will truncate the data file we've just mmap'ed.
* So, we go through and touch each page, forcing the
* system to give us a private copy. A page size of 512
* guarantees this will work, even on the least common
* denominator system (like, oh say, a VAX).
*/
for (cp = iop->buf; cp < iop->end; cp += 512)
*cp = *cp;
}
out:
#endif /* HAVE_MMAP */
return iop;
}
/* These macros used by both record reading routines */
#define set_RT_to_null() \
(void)(! do_traditional && (unref(RT_node->var_value), \
RT_node->var_value = Nnull_string))
#define set_RT(str, len) \
(void)(! do_traditional && (unref(RT_node->var_value), \
RT_node->var_value = make_string(str, len)))
/*
* get_a_record:
* Get the next record. Uses a "split buffer" where the latter part is
* the normal read buffer and the head part is an "overflow" area that is used
* when a record spans the end of the normal buffer, in which case the first
* part of the record is copied into the overflow area just before the
* normal buffer. Thus, the eventual full record can be returned as a
* contiguous area of memory with a minimum of copying. The overflow area
* is expanded as needed, so that records are unlimited in length.
* We also mark both the end of the buffer and the end of the read() with
* a sentinel character (the current record separator) so that the inside
* loop can run as a single test.
*
* Note that since we know or can compute the end of the read and the end
* of the buffer, the sentinel character does not get in the way of regexp
* based searching, since we simply search up to that character, but not
* including it.
*/
static int
get_a_record(out, iop, grRS, RSre, errcode)
char **out; /* pointer to pointer to data */
IOBUF *iop; /* input IOP */
register int grRS; /* first char in RS->stptr */
Regexp *RSre; /* regexp for RS */
int *errcode; /* pointer to error variable */
{
register char *bp = iop->off;
char *bufend;
char *start = iop->off; /* beginning of record */
int rs;
static Regexp *RS_null_re = NULL;
Regexp *rsre = NULL;
int continuing = FALSE, continued = FALSE; /* used for re matching */
int onecase;
/* first time through */
if (RS_null_re == NULL) {
RS_null_re = make_regexp("\n\n+", 3, TRUE, TRUE);
if (RS_null_re == NULL)
fatal("internal error: file `%s', line %d\n",
__FILE__, __LINE__);
}
if (iop->cnt == EOF) { /* previous read hit EOF */
*out = NULL;
set_RT_to_null();
return EOF;
}
if (grRS == FALSE) /* special case: RS == "" */
rs = '\n';
else
rs = (char) grRS;
onecase = (IGNORECASE && isalpha(rs));
if (onecase)
rs = casetable[rs];
/* set up sentinel */
if (iop->buf) {
bufend = iop->buf + iop->size + iop->secsiz;
*bufend = rs; /* add sentinel to buffer */
} else
bufend = NULL;
for (;;) { /* break on end of record, read error or EOF */
/* buffer mgmt, chunk #1 */
/*
* Following code is entered on the first call of this routine
* for a new iop, or when we scan to the end of the buffer.
* In the latter case, we copy the current partial record to
* the space preceding the normal read buffer. If necessary,
* we expand this space. This is done so that we can return
* the record as a contiguous area of memory.
*/
if ((iop->flag & IOP_IS_INTERNAL) == 0 && bp >= bufend) {
char *oldbuf = NULL;
char *oldsplit = iop->buf + iop->secsiz;
long len; /* record length so far */
len = bp - start;
if (len > iop->secsiz) {
/* expand secondary buffer */
if (iop->secsiz == -2)
iop->secsiz = 256;
while (len > iop->secsiz)
iop->secsiz *= 2;
oldbuf = iop->buf;
emalloc(iop->buf, char *,
iop->size+iop->secsiz+2, "get_a_record");
bufend = iop->buf + iop->size + iop->secsiz;
*bufend = rs;
}
if (len > 0) {
char *newsplit = iop->buf + iop->secsiz;
if (start < oldsplit) {
memcpy(newsplit - len, start,
oldsplit - start);
memcpy(newsplit - (bp - oldsplit),
oldsplit, bp - oldsplit);
} else
memcpy(newsplit - len, start, len);
}
bp = iop->end = iop->off = iop->buf + iop->secsiz;
start = bp - len;
if (oldbuf != NULL) {
free(oldbuf);
oldbuf = NULL;
}
}
/* buffer mgmt, chunk #2 */
/*
* Following code is entered whenever we have no more data to
* scan. In most cases this will read into the beginning of
* the main buffer, but in some cases (terminal, pipe etc.)
* we may be doing smallish reads into more advanced positions.
*/
if (bp >= iop->end) {
if ((iop->flag & IOP_IS_INTERNAL) != 0) {
iop->cnt = EOF;
break;
}
iop->cnt = read(iop->fd, iop->end, bufend - iop->end);
if (iop->cnt == -1) {
if (! do_traditional && errcode != NULL) {
*errcode = errno;
iop->cnt = EOF;
break;
} else
fatal("error reading input file `%s': %s",
iop->name, strerror(errno));
} else if (iop->cnt == 0) {
/*
* hit EOF before matching RS, so end
* the record and set RT to ""
*/
iop->cnt = EOF;
/* see comments below about this test */
if (! continuing) {
set_RT_to_null();
break;
}
}
if (iop->cnt != EOF) {
iop->end += iop->cnt;
*iop->end = rs; /* reset the sentinel */
}
}
/* buffers are now setup and filled with data */
/* search for RS, #1, regexp based, or RS = "" */
/*
* Attempt to simplify the code a bit. The case where
* RS = "" can also be described by a regexp, RS = "\n\n+".
* The buffer managment and searching code can thus now
* use a common case (the one for regexps) both when RS is
* a regexp, and when RS = "". This particularly benefits
* us for keeping track of how many newlines were matched
* in order to set RT.
*/
if (! do_traditional && RSre != NULL) /* regexp */
rsre = RSre;
else if (grRS == FALSE) /* RS = "" */
rsre = RS_null_re;
else
rsre = NULL;
/*
* Look for regexp match of RS. Non-match conditions are:
* 1. No match at all
* 2. Match of a null string
* 3. Match ends at exact end of buffer
* Number 3 is subtle; we have to add more to the buffer
* in case the match would have extended further into the
* file, since regexp match by definition always matches the
* longest possible match.
*
* It is even more subtle than you might think. Suppose
* the re matches at exactly the end of file. We don't know
* that until we try to add more to the buffer. Thus, we
* set a flag to indicate, that if eof really does happen,
* don't break early.
*/
continuing = FALSE;
if (rsre != NULL) {
again:
/* cases 1 and 2 are simple, just keep going */
if (research(rsre, start, 0, iop->end - start, TRUE) == -1
|| RESTART(rsre, start) == REEND(rsre, start)) {
bp = iop->end;
continue;
}
/* case 3, regex match at exact end */
if (start + REEND(rsre, start) >= iop->end) {
if (iop->cnt != EOF) {
bp = iop->end;
continuing = continued = TRUE;
continue;
}
}
/* got a match! */
/*
* Leading newlines at the beginning of the file
* should be ignored. Whew!
*/
if (grRS == FALSE && RESTART(rsre, start) == 0) {
start += REEND(rsre, start);
goto again;
}
bp = start + RESTART(rsre, start);
set_RT(bp, REEND(rsre, start) - RESTART(rsre, start));
*bp = '\0';
iop->off = start + REEND(rsre, start);
break;
}
/* search for RS, #2, RS = <single char> */
if (onecase) {
while (casetable[(int) *bp++] != rs)
continue;
} else {
while (*bp++ != rs)
continue;
}
set_RT(bp - 1, 1);
if (bp <= iop->end)
break;
else
bp--;
if ((iop->flag & IOP_IS_INTERNAL) != 0)
iop->cnt = bp - start;
}
if (iop->cnt == EOF
&& (((iop->flag & IOP_IS_INTERNAL) != 0)
|| (start == bp && ! continued))) {
*out = NULL;
set_RT_to_null();
return EOF;
}
if (do_traditional || rsre == NULL) {
char *bstart;
bstart = iop->off = bp;
bp--;
if (onecase ? casetable[(int) *bp] != rs : *bp != rs) {
bp++;
bstart = bp;
}
*bp = '\0';
} else if (grRS == FALSE && iop->cnt == EOF) {
/*
* special case, delete trailing newlines,
* should never be more than one.
*/
while (bp[-1] == '\n')
bp--;
*bp = '\0';
}
*out = start;
return bp - start;
}
#ifdef TEST
int
main(argc, argv)
int argc;
char *argv[];
{
IOBUF *iop;
char *out;
int cnt;
char rs[2];
rs[0] = '\0';
if (argc > 1)
bufsize = atoi(argv[1]);
if (argc > 2)
rs[0] = *argv[2];
iop = iop_alloc(0, "stdin", NULL);
while ((cnt = get_a_record(&out, iop, rs[0], NULL, NULL)) > 0) {
fwrite(out, 1, cnt, stdout);
fwrite(rs, 1, 1, stdout);
}
return 0;
}
#endif
#ifdef HAVE_MMAP
/* mmap_get_record --- pull a record out of a memory-mapped file */
static int
mmap_get_record(out, iop, grRS, RSre, errcode)
char **out; /* pointer to pointer to data */
IOBUF *iop; /* input IOP */
register int grRS; /* first char in RS->stptr */
Regexp *RSre; /* regexp for RS */
int *errcode; /* pointer to error variable */
{
register char *bp = iop->off;
char *start = iop->off; /* beginning of record */
int rs;
static Regexp *RS_null_re = NULL;
Regexp *rsre = NULL;
int onecase;
register char *end = iop->end;
int cnt;
/* first time through */
if (RS_null_re == NULL) {
RS_null_re = make_regexp("\n\n+", 3, TRUE, TRUE);
if (RS_null_re == NULL)
fatal("internal error: file `%s', line %d\n",
__FILE__, __LINE__);
}
if (iop->off >= iop->end) { /* previous record was last */
*out = NULL;
set_RT_to_null();
iop->cnt = EOF; /* tested by higher level code */
return EOF;
}
if (grRS == FALSE) /* special case: RS == "" */
rs = '\n';
else
rs = (char) grRS;
onecase = (IGNORECASE && isalpha(rs));
if (onecase)
rs = casetable[rs];
/* if RS = "", skip leading newlines at the front of the file */
if (grRS == FALSE && iop->off == iop->buf) {
for (bp = iop->off; *bp == '\n'; bp++)
continue;
if (bp != iop->off)
iop->off = start = bp;
}
/*
* Regexp based searching. Either RS = "" or RS = <regex>
* See comments in get_a_record.
*/
if (! do_traditional && RSre != NULL) /* regexp */
rsre = RSre;
else if (grRS == FALSE) /* RS = "" */
rsre = RS_null_re;
else
rsre = NULL;
/*
* Look for regexp match of RS. Non-match conditions are:
* 1. No match at all
* 2. Match of a null string
* 3. Match ends at exact end of buffer
*
* #1 means that the record ends the file
* and there is no text that actually matched RS.
*
* #2: is probably like #1.
*
* #3 is simple; since we have the whole file mapped, it's
* the last record in the file.
*/
if (rsre != NULL) {
if (research(rsre, start, 0, iop->end - start, TRUE) == -1
|| RESTART(rsre, start) == REEND(rsre, start)) {
/* no matching text, we have the record */
*out = start;
iop->off = iop->end; /* all done with the record */
set_RT_to_null();
/* special case, don't allow trailing newlines */
if (grRS == FALSE && *(iop->end - 1) == '\n')
return iop->end - start - 1;
else
return iop->end - start;
}
/* have a match */
*out = start;
bp = start + RESTART(rsre, start);
set_RT(bp, REEND(rsre, start) - RESTART(rsre, start));
*bp = '\0';
iop->off = start + REEND(rsre, start);
return bp - start;
}
/*
* RS = "?", i.e., one character based searching.
*
* Alas, we can't just plug the sentinel character in at
* the end of the mmapp'ed file ( *(iop->end) = rs; ). This
* works if we're lucky enough to have a file that does not
* take up all of its last disk block. But if we end up with
* file whose size is an even multiple of the disk block size,
* assigning past the end of it delivers a SIGBUS. So, we have to
* add the extra test in the while loop at the front that looks
* for going past the end of the mapped object. Sigh.
*/
/* search for RS, #2, RS = <single char> */
if (onecase) {
while (bp < end && casetable[*bp++] != rs)
continue;
} else {
while (bp < end && *bp++ != rs)
continue;
}
cnt = (bp - start) - 1;
if (bp >= iop->end) {
/* at end, may have actually seen rs, or may not */
if (*(bp-1) == rs)
set_RT(bp - 1, 1); /* real RS seen */
else {
cnt++;
set_RT_to_null();
}
} else
set_RT(bp - 1, 1);
iop->off = bp;
*out = start;
return cnt;
}
#endif /* HAVE_MMAP */
/* set_RS --- update things as appropriate when RS is set */
void
set_RS()
{
static NODE *save_rs = NULL;
if (save_rs && cmp_nodes(RS_node->var_value, save_rs) == 0)
return;
unref(save_rs);
save_rs = dupnode(RS_node->var_value);
RS_is_null = FALSE;
RS = force_string(RS_node->var_value);
if (RS_regexp != NULL) {
refree(RS_regexp);
RS_regexp = NULL;
}
if (RS->stlen == 0)
RS_is_null = TRUE;
else if (RS->stlen > 1)
RS_regexp = make_regexp(RS->stptr, RS->stlen, IGNORECASE, TRUE);
set_FS_if_not_FIELDWIDTHS();
}
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