OpenSolaris_b135/cmd/fmli/oh/evstr.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 1993 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <signal.h>
#include "wish.h"
#include "token.h"
#include "fm_mn_par.h"
#include "var_arrays.h"
#include "terror.h"
#include "eval.h"
#include "moremacros.h"
#include "interrupt.h"
char *pline();
char **parselist();
/* Global variables used in "eval" (see sys/eval.c) */
extern int EV_retcode;
extern int EV_backquotes;
extern int Lasttok;
/*
* EVAL_STRING sets up calls to the evaluator (eval) given the
* expected descriptor type
*/
extern void intr_handler();
char *
eval_string(defstring, flags)
char *defstring;
int *flags;
{
char *retval;
int savecode;
int savequotes;
int savetok;
int tmpflags;
/*
* Save globals used in "eval" (in case eval_string is
* called while "eval" function is still active ... this
* save/restore should ultimately be done in eval.c)
*/
savecode = EV_retcode;
savequotes = EV_backquotes;
savetok = Lasttok;
/* If interrupts are suppose to be enabled,
* set up the interrupt handler.
*/
if (Cur_intr.interrupt)
sigset(SIGINT, intr_handler);
switch(*flags & RETS) {
case RET_BOOL:
retval = pline(defstring, flags);
if (retval && (strCcmp(retval, "false") == 0)) {
free(retval);
retval = NULL;
}
break;
case RET_INT:
case RET_STR:
if (!(retval = pline(defstring, flags)))
retval = strsave(nil);
break;
case RET_ARGS:
case RET_LIST:
retval = (char *) parselist(defstring, flags, '\0', '\0');
break;
}
sigignore(SIGINT); /* ignore interrupts */
if (Cur_intr.skip_eval == TRUE) /* if (eval was interrupted) */
{
Cur_intr.skip_eval = FALSE;
Cur_intr.interrupt = FALSE;
tmpflags = RET_ARGS;
retval = eval_string(Cur_intr.oninterrupt, &tmpflags);
}
/*
* Restore globals used in "eval"
*/
EV_retcode = savecode;
EV_backquotes = savequotes;
Lasttok = savetok;
return(retval);
}
/*
** Calls eval() repeatedly to generate one string.
*/
char *
pline(line, pflags)
char *line;
int *pflags;
{
char *ret;
IOSTRUCT *in, *out;
int firstime;
if (!line)
return(NULL);
/* could be useful in future */
/* if (strcspn(line, "'\"`$\\") == strlen(line)) */
/* return(strsave(line)); */
ret = nil;
firstime = TRUE;
in = io_open(EV_USE_STRING, line);
out = io_open(EV_USE_STRING, NULL);
if (strcspn(line, "`$") == strlen(line))
io_size(out, strlen(line) + 1);
while (eval(in, out, EV_TOKEN))
{
/* for booleans, return code has precidence over the string generated: */
if (EV_retcode && ((*pflags & RETS) == RET_BOOL)) /* abs k16 */
{
ret = NULL;
break;
}
if (firstime)
{
char *str;
str = io_string(out);
if (strncmp(str, "vary", 4) == 0)
{
/* if (*pflags & EVAL_ONCE)
** *pflags = (*pflags & (RETS | FREEIT)) | EVAL_SOMETIMES;
** abs k15 */
*pflags = (*pflags & (RETS | FREEIT)) | EVAL_ALWAYS;
io_seek(out, 0);
}
else if (strncmp(str, "const", 5) == 0)
{
/** if (*pflags & EVAL_SOMETIMES) abs k15 */
*pflags = (*pflags & (RETS | FREEIT)) | EVAL_ONCE;
io_seek(out, 0);
}
else
firstime = FALSE;
free(str);
}
if (!firstime)
putac(' ', out);
}
/* remove trailing space */
if (!firstime)
unputac(out);
if (ret)
ret = io_string(out);
io_close(out);
io_close(in);
return(ret);
}
/*
** Repeatedly calls "eval" to get a list of tokens.
*/
char **
parselist(list, pflags, beg, end)
char *list;
register int *pflags;
char beg;
char end;
{
IOSTRUCT *in, *out;
register char **hold;
char *str;
int squig_flag;
hold = (char **) array_create(sizeof(char *), 5);
if (!(list && *list))
return(hold);
/* flag to tell eval whether `{' and `}' have special meaning */
squig_flag = *pflags & EV_SQUIG;
in = io_open(EV_USE_STRING, list);
out = io_open(EV_USE_STRING, NULL);
if (eval(in, out, EV_TOKEN | squig_flag)) {
str = io_ret_string(out);
if (str && *str == '\0') {
io_seek(out, 0);
if (eval(in, out, EV_TOKEN | squig_flag))
str = io_ret_string(out);
}
if (strncmp(str, "vary", 4) == 0) {
/* if (*pflags & EVAL_ONCE)
** *pflags = (*pflags & (RETS | FREEIT)) | EVAL_SOMETIMES;
abs k15 */
*pflags = (*pflags & (RETS | FREEIT)) | EVAL_ALWAYS;
io_seek(out, 0);
if (eval(in, out, EV_TOKEN | squig_flag))
str = io_ret_string(out);
}
else if (strncmp(str, "const", 5) == 0) {
/** if (*pflags & EVAL_SOMETIMES) abs k15 */
*pflags = (*pflags & (RETS | FREEIT)) | EVAL_ONCE;
io_seek(out, 0);
if (eval(in, out, EV_TOKEN | squig_flag))
str = io_ret_string(out);
}
if (beg && (str[0] != beg)) {
FILE *fp;
char buf[BUFSIZ];
if ((fp = fopen(str, "r")) == NULL) {
warn(NOPEN, nil);
io_close(in);
io_close(out);
return(NULL);
}
while (fgets(buf, BUFSIZ, fp)) {
char *p;
buf[strlen(buf) -1] = '\0';
p = strsave(buf);
hold = (char **) array_append(hold, &p);
}
io_close(in);
io_close(out);
return(hold);
}
if (!beg) {
char *p, *q;
str = strsave(str);
if (EV_backquotes && (p = strtok(str, " \t\n"))) {
for (; p; p = strtok(NULL, " \t\n")) {
q = strsave(p);
hold = (char **) array_append(hold, &q);
}
free(str);
}
else
hold = (char **) array_append(hold, &str);
}
io_seek(out, 0);
while (eval(in, out, EV_TOKEN | squig_flag)) {
if (EV_retcode != 0) {
array_trunc(hold);
break;
}
str = io_string(out);
io_seek(out, 0);
if (!end || (*str != end))
hold = (char **) array_append(hold, &str);
else if (str)
free(str);
}
}
io_close(out);
io_close(in);
return(hold);
}