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Diffstat (limited to 'bin/sh/options.c')
-rw-r--r-- | bin/sh/options.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/bin/sh/options.c b/bin/sh/options.c new file mode 100644 index 0000000..9363e62 --- /dev/null +++ b/bin/sh/options.c @@ -0,0 +1,433 @@ +/*- + * Copyright (c) 1991, 1993 + * 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[] = "@(#)options.c 8.1 (Berkeley) 5/31/93"; +#endif /* not lint */ + +#include "shell.h" +#define DEFINE_OPTIONS +#include "options.h" +#undef DEFINE_OPTIONS +#include "nodes.h" /* for other header files */ +#include "eval.h" +#include "jobs.h" +#include "input.h" +#include "output.h" +#include "trap.h" +#include "var.h" +#include "memalloc.h" +#include "error.h" +#include "mystring.h" + +char *arg0; /* value of $0 */ +struct shparam shellparam; /* current positional parameters */ +char **argptr; /* argument list for builtin commands */ +char *optarg; /* set by nextopt (like getopt) */ +char *optptr; /* used by nextopt */ + +char *minusc; /* argument to -c option */ + + +#ifdef __STDC__ +STATIC void options(int); +STATIC void setoption(int, int); +STATIC void minus_o(char *, int); +#else +STATIC void options(); +STATIC void setoption(); +STATIC void minus_o(); +#endif + + + +/* + * Process the shell command line arguments. + */ + +void +procargs(argc, argv) + char **argv; + { + int i; + + argptr = argv; + if (argc > 0) + argptr++; + for (i = 0; i < NOPTS; i++) + optlist[i].val = 2; + options(1); + if (*argptr == NULL && minusc == NULL) + sflag = 1; + if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) + iflag = 1; + if (mflag == 2) + mflag = iflag; + for (i = 0; i < NOPTS; i++) + if (optlist[i].val == 2) + optlist[i].val = 0; + arg0 = argv[0]; + if (sflag == 0 && minusc == NULL) { + commandname = arg0 = *argptr++; + setinputfile(commandname, 0); + } + shellparam.p = argptr; + /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ + while (*argptr) { + shellparam.nparam++; + argptr++; + } + optschanged(); +} + + +optschanged() { + setinteractive(iflag); + histedit(); + setjobctl(mflag); +} + +/* + * Process shell options. The global variable argptr contains a pointer + * to the argument list; we advance it past the options. + */ + +STATIC void +options(cmdline) { + register char *p; + int val; + int c; + + if (cmdline) + minusc = NULL; + while ((p = *argptr) != NULL) { + argptr++; + if ((c = *p++) == '-') { + val = 1; + if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') { + if (!cmdline) { + /* "-" means turn off -x and -v */ + if (p[0] == '\0') + xflag = vflag = 0; + /* "--" means reset params */ + else if (*argptr == NULL) + setparam(argptr); + } + break; /* "-" or "--" terminates options */ + } + } else if (c == '+') { + val = 0; + } else { + argptr--; + break; + } + while ((c = *p++) != '\0') { + if (c == 'c' && cmdline) { + char *q; +#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ + if (*p == '\0') +#endif + q = *argptr++; + if (q == NULL || minusc != NULL) + error("Bad -c option"); + minusc = q; +#ifdef NOHACK + break; +#endif + } else if (c == 'o') { + minus_o(*argptr, val); + if (*argptr) + argptr++; + } else { + setoption(c, val); + } + } + } +} + +STATIC void +minus_o(name, val) + char *name; + int val; +{ + int i; + + if (name == NULL) { + out1str("Current option settings\n"); + for (i = 0; i < NOPTS; i++) + out1fmt("%-16s%s\n", optlist[i].name, + optlist[i].val ? "on" : "off"); + } else { + for (i = 0; i < NOPTS; i++) + if (equal(name, optlist[i].name)) { + setoption(optlist[i].letter, val); + return; + } + error("Illegal option -o %s", name); + } +} + + +STATIC void +setoption(flag, val) + char flag; + int val; + { + int i; + + for (i = 0; i < NOPTS; i++) + if (optlist[i].letter == flag) { + optlist[i].val = val; + if (val) { + /* #%$ hack for ksh semantics */ + if (flag == 'V') + Eflag = 0; + else if (flag == 'E') + Vflag = 0; + } + return; + } + error("Illegal option -%c", flag); +} + + + +#ifdef mkinit +INCLUDE "options.h" + +SHELLPROC { + int i; + + for (i = 0; i < NOPTS; i++) + optlist[i].val = 0; + optschanged(); + +} +#endif + + +/* + * Set the shell parameters. + */ + +void +setparam(argv) + char **argv; + { + char **newparam; + char **ap; + int nparam; + + for (nparam = 0 ; argv[nparam] ; nparam++); + ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); + while (*argv) { + *ap++ = savestr(*argv++); + } + *ap = NULL; + freeparam(&shellparam); + shellparam.malloc = 1; + shellparam.nparam = nparam; + shellparam.p = newparam; + shellparam.optnext = NULL; +} + + +/* + * Free the list of positional parameters. + */ + +void +freeparam(param) + struct shparam *param; + { + char **ap; + + if (param->malloc) { + for (ap = param->p ; *ap ; ap++) + ckfree(*ap); + ckfree(param->p); + } +} + + + +/* + * The shift builtin command. + */ + +shiftcmd(argc, argv) char **argv; { + int n; + char **ap1, **ap2; + + n = 1; + if (argc > 1) + n = number(argv[1]); + if (n > shellparam.nparam) + error("can't shift that many"); + INTOFF; + shellparam.nparam -= n; + for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { + if (shellparam.malloc) + ckfree(*ap1); + } + ap2 = shellparam.p; + while ((*ap2++ = *ap1++) != NULL); + shellparam.optnext = NULL; + INTON; + return 0; +} + + + +/* + * The set command builtin. + */ + +setcmd(argc, argv) char **argv; { + if (argc == 1) + return showvarscmd(argc, argv); + INTOFF; + options(0); + optschanged(); + if (*argptr != NULL) { + setparam(argptr); + } + INTON; + return 0; +} + + +/* + * The getopts builtin. Shellparam.optnext points to the next argument + * to be processed. Shellparam.optptr points to the next character to + * be processed in the current argument. If shellparam.optnext is NULL, + * then it's the first time getopts has been called. + */ + +getoptscmd(argc, argv) char **argv; { + register char *p, *q; + char c; + char s[10]; + + if (argc != 3) + error("Usage: getopts optstring var"); + if (shellparam.optnext == NULL) { + shellparam.optnext = shellparam.p; + shellparam.optptr = NULL; + } + if ((p = shellparam.optptr) == NULL || *p == '\0') { + p = *shellparam.optnext; + if (p == NULL || *p != '-' || *++p == '\0') { +atend: + fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1); + setvar("OPTIND", s, 0); + shellparam.optnext = NULL; + return 1; + } + shellparam.optnext++; + if (p[0] == '-' && p[1] == '\0') /* check for "--" */ + goto atend; + } + c = *p++; + for (q = argv[1] ; *q != c ; ) { + if (*q == '\0') { + out1fmt("Illegal option -%c\n", c); + c = '?'; + goto out; + } + if (*++q == ':') + q++; + } + if (*++q == ':') { + if (*p == '\0' && (p = *shellparam.optnext) == NULL) { + out1fmt("No arg for -%c option\n", c); + c = '?'; + goto out; + } + shellparam.optnext++; + setvar("OPTARG", p, 0); + p = NULL; + } +out: + shellparam.optptr = p; + s[0] = c; + s[1] = '\0'; + setvar(argv[2], s, 0); + return 0; +} + +/* + * XXX - should get rid of. have all builtins use getopt(3). the + * library getopt must have the BSD extension static variable "optreset" + * otherwise it can't be used within the shell safely. + * + * Standard option processing (a la getopt) for builtin routines. The + * only argument that is passed to nextopt is the option string; the + * other arguments are unnecessary. It return the character, or '\0' on + * end of input. + */ + +int +nextopt(optstring) + char *optstring; + { + register char *p, *q; + char c; + + if ((p = optptr) == NULL || *p == '\0') { + p = *argptr; + if (p == NULL || *p != '-' || *++p == '\0') + return '\0'; + argptr++; + if (p[0] == '-' && p[1] == '\0') /* check for "--" */ + return '\0'; + } + c = *p++; + for (q = optstring ; *q != c ; ) { + if (*q == '\0') + error("Illegal option -%c", c); + if (*++q == ':') + q++; + } + if (*++q == ':') { + if (*p == '\0' && (p = *argptr++) == NULL) + error("No arg for -%c option", c); + optarg = p; + p = NULL; + } + optptr = p; + return c; +} |