| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)options.c 5.2 (Berkeley) 3/13/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | #include "shell.h"
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| 42 | #define DEFINE_OPTIONS
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| 43 | #include "options.h"
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| 44 | #undef DEFINE_OPTIONS
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| 45 | #include "nodes.h" /* for other header files */
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| 46 | #include "eval.h"
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| 47 | #include "jobs.h"
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| 48 | #include "input.h"
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| 49 | #include "output.h"
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| 50 | #include "trap.h"
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| 51 | #include "var.h"
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| 52 | #include "memalloc.h"
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| 53 | #include "error.h"
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| 54 | #include "mystring.h"
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| 55 |
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| 56 | char *arg0; /* value of $0 */
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| 57 | struct shparam shellparam; /* current positional parameters */
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| 58 | char **argptr; /* argument list for builtin commands */
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| 59 | char *optarg; /* set by nextopt (like getopt) */
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| 60 | char *optptr; /* used by nextopt */
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| 61 | int editable; /* isatty(0) && isatty(1) */
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| 62 |
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| 63 | char *minusc; /* argument to -c option */
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| 64 |
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| 65 |
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| 66 | #ifdef __STDC__
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| 67 | STATIC void options(int);
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| 68 | STATIC void setoption(int, int);
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| 69 | #else
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| 70 | STATIC void options();
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| 71 | STATIC void setoption();
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| 72 | #endif
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| 73 |
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| 74 |
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| 75 |
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| 76 | /*
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| 77 | * Process the shell command line arguments.
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| 78 | */
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| 79 |
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| 80 | void
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| 81 | procargs(argc, argv)
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| 82 | char **argv;
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| 83 | {
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| 84 | char *p;
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| 85 |
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| 86 | argptr = argv;
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| 87 | if (argc > 0)
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| 88 | argptr++;
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| 89 | for (p = optval ; p < optval + sizeof optval - 1 ; p++)
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| 90 | *p = 2;
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| 91 | options(1);
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| 92 | if (*argptr == NULL && minusc == NULL)
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| 93 | sflag = 1;
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| 94 | editable = (isatty(0) && isatty(1));
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| 95 | if (iflag == 2 && sflag == 1 && editable)
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| 96 | iflag = 1;
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| 97 | if (jflag == 2)
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| 98 | jflag = iflag;
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| 99 | for (p = optval ; p < optval + sizeof optval - 1 ; p++)
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| 100 | if (*p == 2)
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| 101 | *p = 0;
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| 102 | arg0 = argv[0];
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| 103 | if (sflag == 0) {
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| 104 | arg0 = *argptr++;
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| 105 | if (minusc == NULL) {
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| 106 | commandname = arg0;
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| 107 | setinputfile(commandname, 0);
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| 108 | }
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| 109 | }
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| 110 | shellparam.p = argptr;
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| 111 | /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
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| 112 | while (*argptr) {
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| 113 | shellparam.nparam++;
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| 114 | argptr++;
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| 115 | }
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| 116 | setinteractive(iflag);
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| 117 | setjobctl(jflag);
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| 118 | }
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| 119 |
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| 120 |
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| 121 |
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| 122 | /*
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| 123 | * Process shell options. The global variable argptr contains a pointer
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| 124 | * to the argument list; we advance it past the options.
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| 125 | */
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| 126 |
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| 127 | STATIC void
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| 128 | options(cmdline) {
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| 129 | register char *p;
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| 130 | int val;
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| 131 | int c;
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| 132 |
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| 133 | if (cmdline)
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| 134 | minusc = NULL;
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| 135 | while ((p = *argptr) != NULL) {
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| 136 | argptr++;
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| 137 | if ((c = *p++) == '-') {
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| 138 | val = 1;
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| 139 | if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
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| 140 | if (!cmdline) {
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| 141 | /* "-" means turn off -x and -v */
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| 142 | if (p[0] == '\0')
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| 143 | xflag = vflag = 0;
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| 144 | /* "--" means reset params */
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| 145 | else if (*argptr == NULL)
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| 146 | setparam(argptr);
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| 147 | }
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| 148 | break; /* "-" or "--" terminates options */
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| 149 | }
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| 150 | } else if (c == '+') {
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| 151 | val = 0;
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| 152 | } else {
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| 153 | argptr--;
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| 154 | break;
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| 155 | }
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| 156 | while ((c = *p++) != '\0') {
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| 157 | if (c == 'c' && cmdline) {
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| 158 | char *q;
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| 159 | #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
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| 160 | if (*p == '\0')
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| 161 | #endif
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| 162 | q = *argptr++;
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| 163 | if (q == NULL || minusc != NULL)
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| 164 | error("Bad -c option");
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| 165 | minusc = q;
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| 166 | #ifdef NOHACK
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| 167 | break;
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| 168 | #endif
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| 169 | } else {
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| 170 | setoption(c, val);
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| 171 | }
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| 172 | }
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| 173 | if (! cmdline)
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| 174 | break;
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| 175 | }
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| 176 | }
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| 177 |
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| 178 |
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| 179 | STATIC void
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| 180 | setoption(flag, val)
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| 181 | char flag;
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| 182 | int val;
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| 183 | {
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| 184 | register char *p;
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| 185 |
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| 186 | if ((p = strchr(optchar, flag)) == NULL)
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| 187 | error("Illegal option -%c", flag);
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| 188 | optval[p - optchar] = val;
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| 189 | }
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| 190 |
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| 191 |
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| 192 |
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| 193 | #ifdef mkinit
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| 194 | INCLUDE "options.h"
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| 195 |
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| 196 | SHELLPROC {
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| 197 | char *p;
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| 198 |
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| 199 | for (p = optval ; p < optval + sizeof optval ; p++)
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| 200 | *p = 0;
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| 201 | }
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| 202 | #endif
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| 203 |
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| 204 |
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| 205 | /*
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| 206 | * Set the shell parameters.
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| 207 | */
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| 208 |
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| 209 | void
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| 210 | setparam(argv)
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| 211 | char **argv;
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| 212 | {
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| 213 | char **newparam;
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| 214 | char **ap;
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| 215 | int nparam;
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| 216 |
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| 217 | for (nparam = 0 ; argv[nparam] ; nparam++);
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| 218 | ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
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| 219 | while (*argv) {
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| 220 | *ap++ = savestr(*argv++);
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| 221 | }
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| 222 | *ap = NULL;
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| 223 | freeparam(&shellparam);
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| 224 | shellparam.malloc = 1;
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| 225 | shellparam.nparam = nparam;
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| 226 | shellparam.p = newparam;
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| 227 | shellparam.optnext = NULL;
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| 228 | }
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| 229 |
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| 230 |
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| 231 | /*
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| 232 | * Free the list of positional parameters.
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| 233 | */
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| 234 |
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| 235 | void
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| 236 | freeparam(param)
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| 237 | struct shparam *param;
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| 238 | {
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| 239 | char **ap;
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| 240 |
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| 241 | if (param->malloc) {
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| 242 | for (ap = param->p ; *ap ; ap++)
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| 243 | ckfree(*ap);
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| 244 | ckfree(param->p);
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| 245 | }
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| 246 | }
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| 247 |
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| 248 |
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| 249 |
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| 250 | /*
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| 251 | * The shift builtin command.
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| 252 | */
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| 253 |
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| 254 | shiftcmd(argc, argv) char **argv; {
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| 255 | int n;
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| 256 | char **ap1, **ap2;
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| 257 |
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| 258 | n = 1;
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| 259 | if (argc > 1)
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| 260 | n = number(argv[1]);
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| 261 | if (n > shellparam.nparam)
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| 262 | n = shellparam.nparam;
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| 263 | INTOFF;
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| 264 | shellparam.nparam -= n;
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| 265 | for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
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| 266 | if (shellparam.malloc)
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| 267 | ckfree(*ap1);
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| 268 | }
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| 269 | ap2 = shellparam.p;
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| 270 | while ((*ap2++ = *ap1++) != NULL);
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| 271 | shellparam.optnext = NULL;
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| 272 | INTON;
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| 273 | return 0;
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| 274 | }
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| 275 |
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| 276 |
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| 277 |
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| 278 | /*
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| 279 | * The set command builtin.
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| 280 | */
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| 281 |
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| 282 | setcmd(argc, argv) char **argv; {
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| 283 | if (argc == 1)
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| 284 | return showvarscmd(argc, argv);
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| 285 | INTOFF;
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| 286 | options(0);
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| 287 | setinteractive(iflag);
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| 288 | setjobctl(jflag);
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| 289 | if (*argptr != NULL) {
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| 290 | setparam(argptr);
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| 291 | }
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| 292 | INTON;
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| 293 | return 0;
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| 294 | }
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| 295 |
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| 296 |
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| 297 | /*
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| 298 | * The getopts builtin. Shellparam.optnext points to the next argument
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| 299 | * to be processed. Shellparam.optptr points to the next character to
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| 300 | * be processed in the current argument. If shellparam.optnext is NULL,
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| 301 | * then it's the first time getopts has been called.
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| 302 | */
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| 303 |
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| 304 | getoptscmd(argc, argv) char **argv; {
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| 305 | register char *p, *q;
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| 306 | char c;
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| 307 | char s[10];
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| 308 |
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| 309 | if (argc != 3)
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| 310 | error("Usage: getopts optstring var");
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| 311 | if (shellparam.optnext == NULL) {
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| 312 | shellparam.optnext = shellparam.p;
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| 313 | shellparam.optptr = NULL;
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| 314 | }
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| 315 | if ((p = shellparam.optptr) == NULL || *p == '\0') {
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| 316 | p = *shellparam.optnext;
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| 317 | if (p == NULL || *p != '-' || *++p == '\0') {
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| 318 | atend:
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| 319 | fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
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| 320 | setvar("OPTIND", s, 0);
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| 321 | shellparam.optnext = NULL;
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| 322 | return 1;
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| 323 | }
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| 324 | shellparam.optnext++;
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| 325 | if (p[0] == '-' && p[1] == '\0') /* check for "--" */
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| 326 | goto atend;
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| 327 | }
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| 328 | c = *p++;
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| 329 | for (q = argv[1] ; *q != c ; ) {
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| 330 | if (*q == '\0') {
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| 331 | out1fmt("Illegal option -%c\n", c);
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| 332 | c = '?';
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| 333 | goto out;
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| 334 | }
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| 335 | if (*++q == ':')
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| 336 | q++;
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| 337 | }
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| 338 | if (*++q == ':') {
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| 339 | if (*p == '\0') {
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| 340 | if ((p = *shellparam.optnext) == NULL) {
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| 341 | out1fmt("No arg for -%c option\n", c);
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| 342 | c = '?';
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| 343 | goto out;
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| 344 | }
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| 345 | shellparam.optnext++;
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| 346 | }
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| 347 | setvar("OPTARG", p, 0);
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| 348 | p = "";
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| 349 | }
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| 350 | out:
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| 351 | shellparam.optptr = p;
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| 352 | s[0] = c;
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| 353 | s[1] = '\0';
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| 354 | setvar(argv[2], s, 0);
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| 355 | fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
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| 356 | setvar("OPTIND", s, 0);
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| 357 | return 0;
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| 358 | }
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| 359 |
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| 360 | /*
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| 361 | * Standard option processing (a la getopt) for builtin routines. The
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| 362 | * only argument that is passed to nextopt is the option string; the
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| 363 | * other arguments are unnecessary. It return the character, or '\0' on
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| 364 | * end of input.
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| 365 | */
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| 366 |
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| 367 | int
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| 368 | nextopt(optstring)
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| 369 | char *optstring;
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| 370 | {
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| 371 | register char *p, *q;
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| 372 | char c;
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| 373 |
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| 374 | if ((p = optptr) == NULL || *p == '\0') {
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| 375 | p = *argptr;
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| 376 | if (p == NULL || *p != '-' || *++p == '\0')
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| 377 | return '\0';
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| 378 | argptr++;
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| 379 | if (p[0] == '-' && p[1] == '\0') /* check for "--" */
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| 380 | return '\0';
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| 381 | }
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| 382 | c = *p++;
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| 383 | for (q = optstring ; *q != c ; ) {
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| 384 | if (*q == '\0')
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| 385 | error("Illegal option -%c", c);
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| 386 | if (*++q == ':')
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| 387 | q++;
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| 388 | }
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| 389 | if (*++q == ':') {
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| 390 | if (*p == '\0' && (p = *argptr++) == NULL)
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| 391 | error("No arg for -%c option", c);
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| 392 | optarg = p;
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| 393 | p = NULL;
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| 394 | }
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| 395 | optptr = p;
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| 396 | return c;
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| 397 | }
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