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miscbltin.c revision 1.7 
      1 /*-
      2  * Copyright (c) 1991, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Kenneth Almquist.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 static char sccsid[] = "@(#)miscbltin.c	8.2 (Berkeley) 4/16/94";
     39 #endif /* not lint */
     40 
     41 /*
     42  * Miscelaneous builtins.
     43  */
     44 
     45 #include "shell.h"
     46 #include "options.h"
     47 #include "var.h"
     48 #include "output.h"
     49 #include "memalloc.h"
     50 #include "error.h"
     51 #include "mystring.h"
     52 
     53 #undef eflag
     54 
     55 extern char **argptr;		/* argument list for builtin command */
     56 
     57 
     58 /*
     59  * The read builtin.  The -e option causes backslashes to escape the
     60  * following character.
     61  *
     62  * This uses unbuffered input, which may be avoidable in some cases.
     63  */
     64 
     65 readcmd(argc, argv)  char **argv; {
     66 	char **ap;
     67 	int backslash;
     68 	char c;
     69 	int eflag;
     70 	char *prompt;
     71 	char *ifs;
     72 	char *p;
     73 	int startword;
     74 	int status;
     75 	int i;
     76 
     77 	eflag = 0;
     78 	prompt = NULL;
     79 	while ((i = nextopt("ep:")) != '\0') {
     80 		if (i == 'p')
     81 			prompt = optarg;
     82 		else
     83 			eflag = 1;
     84 	}
     85 	if (prompt && isatty(0)) {
     86 		out2str(prompt);
     87 		flushall();
     88 	}
     89 	if (*(ap = argptr) == NULL)
     90 		error("arg count");
     91 	if ((ifs = bltinlookup("IFS", 1)) == NULL)
     92 		ifs = nullstr;
     93 	status = 0;
     94 	startword = 1;
     95 	backslash = 0;
     96 	STARTSTACKSTR(p);
     97 	for (;;) {
     98 		if (read(0, &c, 1) != 1) {
     99 			status = 1;
    100 			break;
    101 		}
    102 		if (c == '\0')
    103 			continue;
    104 		if (backslash) {
    105 			backslash = 0;
    106 			if (c != '\n')
    107 				STPUTC(c, p);
    108 			continue;
    109 		}
    110 		if (eflag && c == '\\') {
    111 			backslash++;
    112 			continue;
    113 		}
    114 		if (c == '\n')
    115 			break;
    116 		if (startword && *ifs == ' ' && strchr(ifs, c)) {
    117 			continue;
    118 		}
    119 		startword = 0;
    120 		if (backslash && c == '\\') {
    121 			if (read(0, &c, 1) != 1) {
    122 				status = 1;
    123 				break;
    124 			}
    125 			STPUTC(c, p);
    126 		} else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
    127 			STACKSTRNUL(p);
    128 			setvar(*ap, stackblock(), 0);
    129 			ap++;
    130 			startword = 1;
    131 			STARTSTACKSTR(p);
    132 		} else {
    133 			STPUTC(c, p);
    134 		}
    135 	}
    136 	STACKSTRNUL(p);
    137 	setvar(*ap, stackblock(), 0);
    138 	while (*++ap != NULL)
    139 		setvar(*ap, nullstr, 0);
    140 	return status;
    141 }
    142 
    143 
    144 
    145 umaskcmd(argc, argv)  char **argv; {
    146 	int mask;
    147 	char *p;
    148 	int i;
    149 
    150 	if ((p = argv[1]) == NULL) {
    151 		INTOFF;
    152 		mask = umask(0);
    153 		umask(mask);
    154 		INTON;
    155 		out1fmt("%.4o\n", mask);	/* %#o might be better */
    156 	} else {
    157 		mask = 0;
    158 		do {
    159 			if ((unsigned)(i = *p - '0') >= 8)
    160 				error("Illegal number: %s", argv[1]);
    161 			mask = (mask << 3) + i;
    162 		} while (*++p != '\0');
    163 		umask(mask);
    164 	}
    165 	return 0;
    166 }
    167