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./busybox getopt -n one -n two woot ./busybox getopt -o one -o two woot This entire applet is still an enormous pile of garbage, which I can't clean up because I really have no idea what it's for. (Both "man getopt" and trying it out on the command line a bit fail to enlighten me. Reading the code, the fact half of it seems to be special cases for bash vs tcsh does not fill me with confidence.)
389 lines
13 KiB
C
389 lines
13 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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 Mi<B6>kiewicz
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <getopt.h>
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#include "busybox.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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static const int NON_OPT = 1;
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/* LONG_OPT is the code that is returned when a long option is found. */
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static const int LONG_OPT = 2;
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/* The shells recognized. */
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typedef enum {BASH,TCSH} shell_t;
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/* Some global variables that tells us how to parse. */
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static shell_t shell=BASH; /* The shell we generate output for. */
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static int quiet_errors=0; /* 0 is not quiet. */
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static int quiet_output=0; /* 0 is not quiet. */
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static int quote=1; /* 1 is do quote. */
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static int alternative=0; /* 0 is getopt_long, 1 is getopt_long_only */
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/* Function prototypes */
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static const char *normalize(const char *arg);
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static int generate_output(char * argv[],int argc,const char *optstr,
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const struct option *longopts);
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static void add_long_options(char *options);
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static void add_longopt(const char *name,int has_arg);
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static void set_shell(const char *new_shell);
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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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const char *normalize(const char *arg)
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{
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static char *BUFFER=NULL;
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const char *argptr=arg;
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char *bufptr;
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free(BUFFER);
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if (!quote) { /* Just copy arg */
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BUFFER=bb_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 (*argptr) {
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if (*argptr == '\'') {
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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 && *argptr=='!') {
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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 && *argptr=='\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(*argptr)) {
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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++=*argptr;
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*bufptr++='\'';
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} else
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/* Just copy */
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*bufptr++=*argptr;
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argptr++;
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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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int generate_output(char * argv[],int argc,const char *optstr,
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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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int longindex;
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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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optind=0; /* Reset getopt(3) */
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while ((opt = (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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!= EOF)
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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 (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 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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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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printf("\n");
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}
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return exit_code;
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}
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static struct option *long_options=NULL;
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static int long_options_length=0; /* Length of array */
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static int long_options_nr=0; /* Nr of used elements in array */
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static const int LONG_OPTIONS_INCR = 10;
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#define init_longopt() add_longopt(NULL,0)
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/* Register a long option. The contents of name is copied. */
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void add_longopt(const char *name,int has_arg)
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{
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if (!name) { /* init */
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free(long_options);
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long_options=NULL;
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long_options_length=0;
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long_options_nr=0;
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}
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if (long_options_nr == long_options_length) {
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long_options_length += LONG_OPTIONS_INCR;
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long_options=xrealloc(long_options,
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sizeof(struct option) *
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long_options_length);
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}
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long_options[long_options_nr].name=NULL;
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long_options[long_options_nr].has_arg=0;
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long_options[long_options_nr].flag=NULL;
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long_options[long_options_nr].val=0;
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if (long_options_nr) { /* Not for init! */
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long_options[long_options_nr-1].has_arg=has_arg;
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long_options[long_options_nr-1].flag=NULL;
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long_options[long_options_nr-1].val=LONG_OPT;
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long_options[long_options_nr-1].name=bb_xstrdup(name);
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}
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long_options_nr++;
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}
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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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void add_long_options(char *options)
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{
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int arg_opt, tlen;
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char *tokptr=strtok(options,", \t\n");
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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 > 0) {
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if (tokptr[tlen-1] == ':') {
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if (tlen > 1 && tokptr[tlen-2] == ':') {
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tokptr[tlen-2]='\0';
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tlen -= 2;
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arg_opt=optional_argument;
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} else {
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tokptr[tlen-1]='\0';
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tlen -= 1;
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arg_opt=required_argument;
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}
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if (tlen == 0)
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bb_error_msg("empty long option after -l or --long argument");
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}
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add_longopt(tokptr,arg_opt);
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}
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tokptr=strtok(NULL,", \t\n");
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}
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}
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void set_shell(const char *new_shell)
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{
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if (!strcmp(new_shell,"bash"))
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shell=BASH;
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else if (!strcmp(new_shell,"tcsh"))
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shell=TCSH;
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else if (!strcmp(new_shell,"sh"))
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shell=BASH;
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else if (!strcmp(new_shell,"csh"))
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shell=TCSH;
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else
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bb_error_msg("unknown shell after -s or --shell argument");
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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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static struct option longopts[]=
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{
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{"options",required_argument,NULL,'o'},
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{"longoptions",required_argument,NULL,'l'},
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{"quiet",no_argument,NULL,'q'},
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{"quiet-output",no_argument,NULL,'Q'},
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{"shell",required_argument,NULL,'s'},
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{"test",no_argument,NULL,'T'},
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{"unquoted",no_argument,NULL,'u'},
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{"alternative",no_argument,NULL,'a'},
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{"name",required_argument,NULL,'n'},
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{NULL,0,NULL,0}
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};
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/* Stop scanning as soon as a non-option argument is found! */
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static const char *shortopts="+ao:l:n:qQs:Tu";
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int getopt_main(int argc, char *argv[])
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{
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const char *optstr = NULL;
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char *name = NULL;
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int opt;
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int compatible=0;
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init_longopt();
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if (getenv("GETOPT_COMPATIBLE"))
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compatible=1;
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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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} else
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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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quote=0;
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s=xmalloc(strlen(argv[1])+1);
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strcpy(s,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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while ((opt=getopt_long(argc,argv,shortopts,longopts,NULL)) != EOF)
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switch (opt) {
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case 'a':
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alternative=1;
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break;
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case 'o':
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optstr = optarg;
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break;
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case 'l':
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add_long_options(optarg);
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break;
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case 'n':
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name = optarg;
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break;
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case 'q':
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quiet_errors=1;
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break;
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case 'Q':
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quiet_output=1;
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break;
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case 's':
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set_shell(optarg);
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break;
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case 'T':
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return 4;
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case 'u':
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quote=0;
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break;
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default:
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bb_show_usage();
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}
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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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else optstr=argv[optind++];
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}
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if (name)
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argv[optind-1]=name;
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else
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argv[optind-1]=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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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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