miscbltin.c

Go to the documentation of this file.

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)miscbltin.c 5.2 (Berkeley) 3/13/91";
#endif /* not lint */

/*
 * Miscelaneous builtins.
 */

#include "shell.h"
#include "options.h"
#include "var.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "mystring.h"

#undef eflag

extern char **argptr;           /* argument list for builtin command */


/*
 * The read builtin.  The -e option causes backslashes to escape the
 * following character.
 *
 * This uses unbuffered input, which may be avoidable in some cases.
 */

readcmd(argc, argv)  char **argv; {
        char **ap;
        int backslash;
        char c;
        int eflag;
        char *prompt;
        char *ifs;
        char *p;
        int startword;
        int status;
        int i;

        eflag = 0;
        prompt = NULL;
        while ((i = nextopt("ep:")) != '\0') {
                if (i == 'p')
                        prompt = optarg;
                else
                        eflag = 1;
        }
        if (prompt && isatty(0)) {
                out2str(prompt);
                flushall();
        }
        if (*(ap = argptr) == NULL)
                error("arg count");
        if ((ifs = bltinlookup("IFS", 1)) == NULL)
                ifs = nullstr;
        status = 0;
        startword = 1;
        backslash = 0;
        STARTSTACKSTR(p);
        for (;;) {
                if (read(0, &c, 1) != 1) {
                        status = 1;
                        break;
                }
                if (c == '\0')
                        continue;
                if (backslash) {
                        backslash = 0;
                        if (c != '\n')
                                STPUTC(c, p);
                        continue;
                }
                if (eflag && c == '\\') {
                        backslash++;
                        continue;
                }
                if (c == '\n')
                        break;
                if (startword && *ifs == ' ' && strchr(ifs, c)) {
                        continue;
                }
                startword = 0;
                if (backslash && c == '\\') {
                        if (read(0, &c, 1) != 1) {
                                status = 1;
                                break;
                        }
                        STPUTC(c, p);
                } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
                        STACKSTRNUL(p);
                        setvar(*ap, stackblock(), 0);
                        ap++;
                        startword = 1;
                        STARTSTACKSTR(p);
                } else {
                        STPUTC(c, p);
                }
        }
        STACKSTRNUL(p);
        setvar(*ap, stackblock(), 0);
        while (*++ap != NULL)
                setvar(*ap, nullstr, 0);
        return status;
}



umaskcmd(argc, argv)  char **argv; {
        int mask;
        char *p;
        int i;

        if ((p = argv[1]) == NULL) {
                INTOFF;
                mask = umask(0);
                umask(mask);
                INTON;
                out1fmt("%.4o\n", mask);        /* %#o might be better */
        } else {
                mask = 0;
                do {
                        if ((unsigned)(i = *p - '0') >= 8)
                                error("Illegal number: %s", argv[1]);
                        mask = (mask << 3) + i;
                } while (*++p != '\0');
                umask(mask);
        }
        return 0;
}

---