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hush/util-linux/getopt.c
Manuel Novoa III cad5364599 Major coreutils update.
2003-03-19 09:13:01 +00:00

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/*
* getopt.c - Enhanced implementation of BSD getopt(1)
* Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Version 1.0-b4: Tue Sep 23 1997. First public release.
* Version 1.0: Wed Nov 19 1997.
* Bumped up the version number to 1.0
* Fixed minor typo (CSH instead of TCSH)
* Version 1.0.1: Tue Jun 3 1998
* Fixed sizeof instead of strlen bug
* Bumped up the version number to 1.0.1
* Version 1.0.2: Thu Jun 11 1998 (not present)
* Fixed gcc-2.8.1 warnings
* Fixed --version/-V option (not present)
* Version 1.0.5: Tue Jun 22 1999
* Make -u option work (not present)
* Version 1.0.6: Tue Jun 27 2000
* No important changes
* Version 1.1.0: Tue Jun 30 2000
* Added NLS support (partly written by Arkadiusz Mi<B6>kiewicz
* <misiek@misiek.eu.org>)
* Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
* Removed --version/-V and --help/-h in
* Removed prase_error(), using bb_error_msg() from Busybox instead
* Replaced our_malloc with xmalloc and our_realloc with xrealloc
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <getopt.h>
#include "busybox.h"
/* NON_OPT is the code that is returned when a non-option is found in '+'
mode */
static const int NON_OPT = 1;
/* LONG_OPT is the code that is returned when a long option is found. */
static const int LONG_OPT = 2;
/* The shells recognized. */
typedef enum {BASH,TCSH} shell_t;
/* Some global variables that tells us how to parse. */
static shell_t shell=BASH; /* The shell we generate output for. */
static int quiet_errors=0; /* 0 is not quiet. */
static int quiet_output=0; /* 0 is not quiet. */
static int quote=1; /* 1 is do quote. */
static int alternative=0; /* 0 is getopt_long, 1 is getopt_long_only */
/* Function prototypes */
static const char *normalize(const char *arg);
static int generate_output(char * argv[],int argc,const char *optstr,
const struct option *longopts);
static void add_long_options(char *options);
static void add_longopt(const char *name,int has_arg);
static void set_shell(const char *new_shell);
/*
* This function 'normalizes' a single argument: it puts single quotes around
* it and escapes other special characters. If quote is false, it just
* returns its argument.
* Bash only needs special treatment for single quotes; tcsh also recognizes
* exclamation marks within single quotes, and nukes whitespace.
* This function returns a pointer to a buffer that is overwritten by
* each call.
*/
const char *normalize(const char *arg)
{
static char *BUFFER=NULL;
const char *argptr=arg;
char *bufptr;
free(BUFFER);
if (!quote) { /* Just copy arg */
BUFFER=bb_xstrdup(arg);
return BUFFER;
}
/* Each character in arg may take upto four characters in the result:
For a quote we need a closing quote, a backslash, a quote and an
opening quote! We need also the global opening and closing quote,
and one extra character for '\0'. */
BUFFER=xmalloc(strlen(arg)*4+3);
bufptr=BUFFER;
*bufptr++='\'';
while (*argptr) {
if (*argptr == '\'') {
/* Quote: replace it with: '\'' */
*bufptr++='\'';
*bufptr++='\\';
*bufptr++='\'';
*bufptr++='\'';
} else if (shell==TCSH && *argptr=='!') {
/* Exclamation mark: replace it with: \! */
*bufptr++='\'';
*bufptr++='\\';
*bufptr++='!';
*bufptr++='\'';
} else if (shell==TCSH && *argptr=='\n') {
/* Newline: replace it with: \n */
*bufptr++='\\';
*bufptr++='n';
} else if (shell==TCSH && isspace(*argptr)) {
/* Non-newline whitespace: replace it with \<ws> */
*bufptr++='\'';
*bufptr++='\\';
*bufptr++=*argptr;
*bufptr++='\'';
} else
/* Just copy */
*bufptr++=*argptr;
argptr++;
}
*bufptr++='\'';
*bufptr++='\0';
return BUFFER;
}
/*
* Generate the output. argv[0] is the program name (used for reporting errors).
* argv[1..] contains the options to be parsed. argc must be the number of
* elements in argv (ie. 1 if there are no options, only the program name),
* optstr must contain the short options, and longopts the long options.
* Other settings are found in global variables.
*/
int generate_output(char * argv[],int argc,const char *optstr,
const struct option *longopts)
{
int exit_code = 0; /* We assume everything will be OK */
int opt;
int longindex;
const char *charptr;
if (quiet_errors) /* No error reporting from getopt(3) */
opterr=0;
optind=0; /* Reset getopt(3) */
while ((opt = (alternative?
getopt_long_only(argc,argv,optstr,longopts,&longindex):
getopt_long(argc,argv,optstr,longopts,&longindex)))
!= EOF)
if (opt == '?' || opt == ':' )
exit_code = 1;
else if (!quiet_output) {
if (opt == LONG_OPT) {
printf(" --%s",longopts[longindex].name);
if (longopts[longindex].has_arg)
printf(" %s",
normalize(optarg?optarg:""));
} else if (opt == NON_OPT)
printf(" %s",normalize(optarg));
else {
printf(" -%c",opt);
charptr = strchr(optstr,opt);
if (charptr != NULL && *++charptr == ':')
printf(" %s",
normalize(optarg?optarg:""));
}
}
if (! quiet_output) {
printf(" --");
while (optind < argc)
printf(" %s",normalize(argv[optind++]));
printf("\n");
}
return exit_code;
}
static struct option *long_options=NULL;
static int long_options_length=0; /* Length of array */
static int long_options_nr=0; /* Nr of used elements in array */
static const int LONG_OPTIONS_INCR = 10;
#define init_longopt() add_longopt(NULL,0)
/* Register a long option. The contents of name is copied. */
void add_longopt(const char *name,int has_arg)
{
if (!name) { /* init */
free(long_options);
long_options=NULL;
long_options_length=0;
long_options_nr=0;
}
if (long_options_nr == long_options_length) {
long_options_length += LONG_OPTIONS_INCR;
long_options=xrealloc(long_options,
sizeof(struct option) *
long_options_length);
}
long_options[long_options_nr].name=NULL;
long_options[long_options_nr].has_arg=0;
long_options[long_options_nr].flag=NULL;
long_options[long_options_nr].val=0;
if (long_options_nr) { /* Not for init! */
long_options[long_options_nr-1].has_arg=has_arg;
long_options[long_options_nr-1].flag=NULL;
long_options[long_options_nr-1].val=LONG_OPT;
long_options[long_options_nr-1].name=bb_xstrdup(name);
}
long_options_nr++;
}
/*
* Register several long options. options is a string of long options,
* separated by commas or whitespace.
* This nukes options!
*/
void add_long_options(char *options)
{
int arg_opt, tlen;
char *tokptr=strtok(options,", \t\n");
while (tokptr) {
arg_opt=no_argument;
tlen=strlen(tokptr);
if (tlen > 0) {
if (tokptr[tlen-1] == ':') {
if (tlen > 1 && tokptr[tlen-2] == ':') {
tokptr[tlen-2]='\0';
tlen -= 2;
arg_opt=optional_argument;
} else {
tokptr[tlen-1]='\0';
tlen -= 1;
arg_opt=required_argument;
}
if (tlen == 0)
bb_error_msg("empty long option after -l or --long argument");
}
add_longopt(tokptr,arg_opt);
}
tokptr=strtok(NULL,", \t\n");
}
}
void set_shell(const char *new_shell)
{
if (!strcmp(new_shell,"bash"))
shell=BASH;
else if (!strcmp(new_shell,"tcsh"))
shell=TCSH;
else if (!strcmp(new_shell,"sh"))
shell=BASH;
else if (!strcmp(new_shell,"csh"))
shell=TCSH;
else
bb_error_msg("unknown shell after -s or --shell argument");
}
/* Exit codes:
* 0) No errors, succesful operation.
* 1) getopt(3) returned an error.
* 2) A problem with parameter parsing for getopt(1).
* 3) Internal error, out of memory
* 4) Returned for -T
*/
static struct option longopts[]=
{
{"options",required_argument,NULL,'o'},
{"longoptions",required_argument,NULL,'l'},
{"quiet",no_argument,NULL,'q'},
{"quiet-output",no_argument,NULL,'Q'},
{"shell",required_argument,NULL,'s'},
{"test",no_argument,NULL,'T'},
{"unquoted",no_argument,NULL,'u'},
{"alternative",no_argument,NULL,'a'},
{"name",required_argument,NULL,'n'},
{NULL,0,NULL,0}
};
/* Stop scanning as soon as a non-option argument is found! */
static const char *shortopts="+ao:l:n:qQs:Tu";
int getopt_main(int argc, char *argv[])
{
char *optstr=NULL;
char *name=NULL;
int opt;
int compatible=0;
init_longopt();
if (getenv("GETOPT_COMPATIBLE"))
compatible=1;
if (argc == 1) {
if (compatible) {
/* For some reason, the original getopt gave no error
when there were no arguments. */
printf(" --\n");
return 0;
} else
bb_error_msg_and_die("missing optstring argument");
}
if (argv[1][0] != '-' || compatible) {
quote=0;
optstr=xmalloc(strlen(argv[1])+1);
strcpy(optstr,argv[1]+strspn(argv[1],"-+"));
argv[1]=argv[0];
return (generate_output(argv+1,argc-1,optstr,long_options));
}
while ((opt=getopt_long(argc,argv,shortopts,longopts,NULL)) != EOF)
switch (opt) {
case 'a':
alternative=1;
break;
case 'o':
free(optstr);
optstr=bb_xstrdup(optarg);
break;
case 'l':
add_long_options(optarg);
break;
case 'n':
free(name);
name=bb_xstrdup(optarg);
break;
case 'q':
quiet_errors=1;
break;
case 'Q':
quiet_output=1;
break;
case 's':
set_shell(optarg);
break;
case 'T':
return 4;
case 'u':
quote=0;
break;
default:
bb_show_usage();
}
if (!optstr) {
if (optind >= argc)
bb_error_msg_and_die("missing optstring argument");
else {
optstr=bb_xstrdup(argv[optind]);
optind++;
}
}
if (name)
argv[optind-1]=name;
else
argv[optind-1]=argv[0];
return (generate_output(argv+optind-1,argc-optind+1,optstr,long_options));
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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