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Signed-off-by: Colin Watson <cjwatson@ubuntu.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
355 lines
9.3 KiB
C
355 lines
9.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* getopt.c - Enhanced implementation of BSD getopt(1)
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* Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/*
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* Version 1.0-b4: Tue Sep 23 1997. First public release.
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* Version 1.0: Wed Nov 19 1997.
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* Bumped up the version number to 1.0
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* Fixed minor typo (CSH instead of TCSH)
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* Version 1.0.1: Tue Jun 3 1998
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* Fixed sizeof instead of strlen bug
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* Bumped up the version number to 1.0.1
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* Version 1.0.2: Thu Jun 11 1998 (not present)
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* Fixed gcc-2.8.1 warnings
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* Fixed --version/-V option (not present)
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* Version 1.0.5: Tue Jun 22 1999
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* Make -u option work (not present)
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* Version 1.0.6: Tue Jun 27 2000
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* No important changes
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* Version 1.1.0: Tue Jun 30 2000
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* Added NLS support (partly written by Arkadiusz Mickiewicz
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* <misiek@misiek.eu.org>)
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* Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
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* Removed --version/-V and --help/-h in
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* Removed parse_error(), using bb_error_msg() from Busybox instead
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* Replaced our_malloc with xmalloc and our_realloc with xrealloc
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*
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*/
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#include <getopt.h>
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#include "libbb.h"
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/* NON_OPT is the code that is returned when a non-option is found in '+'
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mode */
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enum {
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NON_OPT = 1,
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#if ENABLE_FEATURE_GETOPT_LONG
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/* LONG_OPT is the code that is returned when a long option is found. */
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LONG_OPT = 2
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#endif
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};
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/* For finding activated option flags. Must match getopt32 call! */
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enum {
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OPT_o = 0x1, // -o
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OPT_n = 0x2, // -n
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OPT_q = 0x4, // -q
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OPT_Q = 0x8, // -Q
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OPT_s = 0x10, // -s
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OPT_T = 0x20, // -T
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OPT_u = 0x40, // -u
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#if ENABLE_FEATURE_GETOPT_LONG
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OPT_a = 0x80, // -a
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OPT_l = 0x100, // -l
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#endif
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SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
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};
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/* 0 is getopt_long, 1 is getopt_long_only */
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#define alternative (option_mask32 & OPT_a)
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#define quiet_errors (option_mask32 & OPT_q)
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#define quiet_output (option_mask32 & OPT_Q)
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#define quote (!(option_mask32 & OPT_u))
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#define shell_TCSH (option_mask32 & SHELL_IS_TCSH)
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/*
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* This function 'normalizes' a single argument: it puts single quotes around
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* it and escapes other special characters. If quote is false, it just
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* returns its argument.
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* Bash only needs special treatment for single quotes; tcsh also recognizes
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* exclamation marks within single quotes, and nukes whitespace.
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* This function returns a pointer to a buffer that is overwritten by
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* each call.
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*/
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static const char *normalize(const char *arg)
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{
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char *bufptr;
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#if ENABLE_FEATURE_CLEAN_UP
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static char *BUFFER = NULL;
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free(BUFFER);
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#else
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char *BUFFER;
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#endif
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if (!quote) { /* Just copy arg */
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BUFFER = xstrdup(arg);
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return BUFFER;
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}
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/* Each character in arg may take up to four characters in the result:
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For a quote we need a closing quote, a backslash, a quote and an
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opening quote! We need also the global opening and closing quote,
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and one extra character for '\0'. */
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BUFFER = xmalloc(strlen(arg)*4 + 3);
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bufptr = BUFFER;
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*bufptr ++= '\'';
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while (*arg) {
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if (*arg == '\'') {
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/* Quote: replace it with: '\'' */
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*bufptr ++= '\'';
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*bufptr ++= '\\';
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*bufptr ++= '\'';
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*bufptr ++= '\'';
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} else if (shell_TCSH && *arg == '!') {
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/* Exclamation mark: replace it with: \! */
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*bufptr ++= '\'';
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*bufptr ++= '\\';
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*bufptr ++= '!';
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*bufptr ++= '\'';
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} else if (shell_TCSH && *arg == '\n') {
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/* Newline: replace it with: \n */
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*bufptr ++= '\\';
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*bufptr ++= 'n';
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} else if (shell_TCSH && isspace(*arg)) {
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/* Non-newline whitespace: replace it with \<ws> */
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*bufptr ++= '\'';
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*bufptr ++= '\\';
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*bufptr ++= *arg;
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*bufptr ++= '\'';
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} else
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/* Just copy */
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*bufptr ++= *arg;
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arg++;
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}
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*bufptr ++= '\'';
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*bufptr ++= '\0';
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return BUFFER;
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}
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/*
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* Generate the output. argv[0] is the program name (used for reporting errors).
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* argv[1..] contains the options to be parsed. argc must be the number of
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* elements in argv (ie. 1 if there are no options, only the program name),
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* optstr must contain the short options, and longopts the long options.
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* Other settings are found in global variables.
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*/
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#if !ENABLE_FEATURE_GETOPT_LONG
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#define generate_output(argv,argc,optstr,longopts) \
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generate_output(argv,argc,optstr)
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#endif
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static int generate_output(char **argv, int argc, const char *optstr, const struct option *longopts)
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{
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int exit_code = 0; /* We assume everything will be OK */
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int opt;
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#if ENABLE_FEATURE_GETOPT_LONG
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int longindex;
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#endif
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const char *charptr;
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if (quiet_errors) /* No error reporting from getopt(3) */
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opterr = 0;
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/* We used it already in main() in getopt32(),
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* we *must* reset getopt(3): */
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#ifdef __GLIBC__
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optind = 0;
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#else /* BSD style */
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optind = 1;
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/* optreset = 1; */
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#endif
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while (1) {
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opt =
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#if ENABLE_FEATURE_GETOPT_LONG
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alternative ?
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getopt_long_only(argc, argv, optstr, longopts, &longindex) :
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getopt_long(argc, argv, optstr, longopts, &longindex);
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#else
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getopt(argc, argv, optstr);
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#endif
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if (opt == -1)
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break;
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if (opt == '?' || opt == ':' )
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exit_code = 1;
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else if (!quiet_output) {
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#if ENABLE_FEATURE_GETOPT_LONG
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if (opt == LONG_OPT) {
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printf(" --%s", longopts[longindex].name);
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if (longopts[longindex].has_arg)
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printf(" %s",
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normalize(optarg ? optarg : ""));
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} else
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#endif
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if (opt == NON_OPT)
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printf(" %s", normalize(optarg));
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else {
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printf(" -%c", opt);
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charptr = strchr(optstr, opt);
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if (charptr != NULL && *++charptr == ':')
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printf(" %s",
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normalize(optarg ? optarg : ""));
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}
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}
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}
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if (!quiet_output) {
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printf(" --");
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while (optind < argc)
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printf(" %s", normalize(argv[optind++]));
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bb_putchar('\n');
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}
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return exit_code;
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}
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#if ENABLE_FEATURE_GETOPT_LONG
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/*
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* Register several long options. options is a string of long options,
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* separated by commas or whitespace.
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* This nukes options!
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*/
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static struct option *add_long_options(struct option *long_options, char *options)
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{
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int long_nr = 0;
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int arg_opt, tlen;
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char *tokptr = strtok(options, ", \t\n");
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if (long_options)
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while (long_options[long_nr].name)
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long_nr++;
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while (tokptr) {
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arg_opt = no_argument;
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tlen = strlen(tokptr);
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if (tlen) {
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tlen--;
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if (tokptr[tlen] == ':') {
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arg_opt = required_argument;
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if (tlen && tokptr[tlen-1] == ':') {
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tlen--;
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arg_opt = optional_argument;
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}
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tokptr[tlen] = '\0';
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if (tlen == 0)
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bb_error_msg_and_die("empty long option specified");
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}
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long_options = xrealloc_vector(long_options, 4, long_nr);
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long_options[long_nr].has_arg = arg_opt;
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/*long_options[long_nr].flag = NULL; - xrealloc_vector did it */
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long_options[long_nr].val = LONG_OPT;
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long_options[long_nr].name = xstrdup(tokptr);
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long_nr++;
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/*memset(&long_options[long_nr], 0, sizeof(long_options[0])); - xrealloc_vector did it */
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}
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tokptr = strtok(NULL, ", \t\n");
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}
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return long_options;
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}
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#endif
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static void set_shell(const char *new_shell)
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{
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if (!strcmp(new_shell, "bash") || !strcmp(new_shell, "sh"))
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return;
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if (!strcmp(new_shell, "tcsh") || !strcmp(new_shell, "csh"))
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option_mask32 |= SHELL_IS_TCSH;
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else
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bb_error_msg("unknown shell '%s', assuming bash", new_shell);
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}
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/* Exit codes:
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* 0) No errors, successful operation.
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* 1) getopt(3) returned an error.
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* 2) A problem with parameter parsing for getopt(1).
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* 3) Internal error, out of memory
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* 4) Returned for -T
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*/
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#if ENABLE_FEATURE_GETOPT_LONG
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static const char getopt_longopts[] ALIGN1 =
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"options\0" Required_argument "o"
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"longoptions\0" Required_argument "l"
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"quiet\0" No_argument "q"
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"quiet-output\0" No_argument "Q"
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"shell\0" Required_argument "s"
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"test\0" No_argument "T"
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"unquoted\0" No_argument "u"
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"alternative\0" No_argument "a"
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"name\0" Required_argument "n"
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;
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#endif
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int getopt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int getopt_main(int argc, char **argv)
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{
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char *optstr = NULL;
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char *name = NULL;
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unsigned opt;
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const char *compatible;
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char *s_arg;
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#if ENABLE_FEATURE_GETOPT_LONG
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struct option *long_options = NULL;
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llist_t *l_arg = NULL;
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#endif
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compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */
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if (argc == 1) {
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if (compatible) {
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/* For some reason, the original getopt gave no error
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when there were no arguments. */
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printf(" --\n");
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return 0;
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}
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bb_error_msg_and_die("missing optstring argument");
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}
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if (argv[1][0] != '-' || compatible) {
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char *s;
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option_mask32 |= OPT_u; /* quoting off */
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s = xstrdup(argv[1] + strspn(argv[1], "-+"));
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argv[1] = argv[0];
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return generate_output(argv+1, argc-1, s, long_options);
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}
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#if !ENABLE_FEATURE_GETOPT_LONG
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opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
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#else
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applet_long_options = getopt_longopts;
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opt_complementary = "l::";
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opt = getopt32(argv, "+o:n:qQs:Tual:",
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&optstr, &name, &s_arg, &l_arg);
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/* Effectuate the read options for the applet itself */
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while (l_arg) {
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long_options = add_long_options(long_options, llist_pop(&l_arg));
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}
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#endif
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if (opt & OPT_s) {
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set_shell(s_arg);
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}
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if (opt & OPT_T) {
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return 4;
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}
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/* All options controlling the applet have now been parsed */
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if (!optstr) {
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if (optind >= argc)
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bb_error_msg_and_die("missing optstring argument");
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optstr = argv[optind++];
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}
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argv[optind-1] = name ? name : argv[0];
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return generate_output(argv+optind-1, argc-optind+1, optstr, long_options);
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}
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