busybox/util-linux/getopt.c

348 lines
9.1 KiB
C

/* vi: set sw=4 ts=4: */
/*
* getopt.c - Enhanced implementation of BSD getopt(1)
* Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/*
* 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 parse_error(), using bb_error_msg() from Busybox instead
* Replaced our_malloc with xmalloc and our_realloc with xrealloc
*
*/
#include <getopt.h>
#include "libbb.h"
/* NON_OPT is the code that is returned when a non-option is found in '+'
mode */
enum {
NON_OPT = 1,
#if ENABLE_GETOPT_LONG
/* LONG_OPT is the code that is returned when a long option is found. */
LONG_OPT = 2
#endif
};
/* For finding activated option flags. Must match getopt32 call! */
enum {
OPT_o = 0x1, // -o
OPT_n = 0x2, // -n
OPT_q = 0x4, // -q
OPT_Q = 0x8, // -Q
OPT_s = 0x10, // -s
OPT_T = 0x20, // -T
OPT_u = 0x40, // -u
#if ENABLE_GETOPT_LONG
OPT_a = 0x80, // -a
OPT_l = 0x100, // -l
#endif
SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
};
/* 0 is getopt_long, 1 is getopt_long_only */
#define alternative (option_mask32 & OPT_a)
#define quiet_errors (option_mask32 & OPT_q)
#define quiet_output (option_mask32 & OPT_Q)
#define quote (!(option_mask32 & OPT_u))
#define shell_TCSH (option_mask32 & SHELL_IS_TCSH)
/*
* 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.
*/
static const char *normalize(const char *arg)
{
char *bufptr;
#if ENABLE_FEATURE_CLEAN_UP
static char *BUFFER = NULL;
free(BUFFER);
#else
char *BUFFER;
#endif
if (!quote) { /* Just copy arg */
BUFFER = xstrdup(arg);
return BUFFER;
}
/* Each character in arg may take up to 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 (*arg) {
if (*arg == '\'') {
/* Quote: replace it with: '\'' */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= '\'';
*bufptr ++= '\'';
} else if (shell_TCSH && *arg == '!') {
/* Exclamation mark: replace it with: \! */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= '!';
*bufptr ++= '\'';
} else if (shell_TCSH && *arg == '\n') {
/* Newline: replace it with: \n */
*bufptr ++= '\\';
*bufptr ++= 'n';
} else if (shell_TCSH && isspace(*arg)) {
/* Non-newline whitespace: replace it with \<ws> */
*bufptr ++= '\'';
*bufptr ++= '\\';
*bufptr ++= *arg;
*bufptr ++= '\'';
} else
/* Just copy */
*bufptr ++= *arg;
arg++;
}
*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.
*/
#if !ENABLE_GETOPT_LONG
#define generate_output(argv,argc,optstr,longopts) generate_output(argv,argc,optstr)
#endif
static int generate_output(char **argv, int argc, const char *optstr, const struct option *longopts)
{
int exit_code = 0; /* We assume everything will be OK */
unsigned opt;
#if ENABLE_GETOPT_LONG
int longindex;
#endif
const char *charptr;
if (quiet_errors) /* No error reporting from getopt(3) */
opterr = 0;
optind = 0; /* Reset getopt(3) */
while (1) {
opt =
#if ENABLE_GETOPT_LONG
alternative ?
getopt_long_only(argc, argv, optstr, longopts, &longindex) :
getopt_long(argc, argv, optstr, longopts, &longindex);
#else
getopt(argc, argv, optstr);
#endif
if (opt == EOF)
break;
if (opt == '?' || opt == ':' )
exit_code = 1;
else if (!quiet_output) {
#if ENABLE_GETOPT_LONG
if (opt == LONG_OPT) {
printf(" --%s", longopts[longindex].name);
if (longopts[longindex].has_arg)
printf(" %s",
normalize(optarg ? optarg : ""));
} else
#endif
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++]));
bb_putchar('\n');
}
return exit_code;
}
#if ENABLE_GETOPT_LONG
/*
* Register several long options. options is a string of long options,
* separated by commas or whitespace.
* This nukes options!
*/
static struct option *add_long_options(struct option *long_options, char *options)
{
int long_nr = 0;
int arg_opt, tlen;
char *tokptr = strtok(options, ", \t\n");
if (long_options)
while (long_options[long_nr].name)
long_nr++;
while (tokptr) {
arg_opt = no_argument;
tlen = strlen(tokptr);
if (tlen) {
tlen--;
if (tokptr[tlen] == ':') {
arg_opt = required_argument;
if (tlen && tokptr[tlen-1] == ':') {
tlen--;
arg_opt = optional_argument;
}
tokptr[tlen] = '\0';
if (tlen == 0)
bb_error_msg_and_die("empty long option specified");
}
long_options = xrealloc(long_options,
sizeof(long_options[0]) * (long_nr+2));
long_options[long_nr].has_arg = arg_opt;
long_options[long_nr].flag = NULL;
long_options[long_nr].val = LONG_OPT;
long_options[long_nr].name = xstrdup(tokptr);
long_nr++;
memset(&long_options[long_nr], 0, sizeof(long_options[0]));
}
tokptr = strtok(NULL, ", \t\n");
}
return long_options;
}
#endif
static void set_shell(const char *new_shell)
{
if (!strcmp(new_shell,"bash") || !strcmp(new_shell,"sh"))
return;
if (!strcmp(new_shell,"tcsh") || !strcmp(new_shell,"csh"))
option_mask32 |= SHELL_IS_TCSH;
else
bb_error_msg("unknown shell '%s', assuming bash", new_shell);
}
/* Exit codes:
* 0) No errors, successful 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
*/
#if ENABLE_GETOPT_LONG
static const char getopt_longopts[] ALIGN1 =
"options\0" Required_argument "o"
"longoptions\0" Required_argument "l"
"quiet\0" No_argument "q"
"quiet-output\0" No_argument "Q"
"shell\0" Required_argument "s"
"test\0" No_argument "T"
"unquoted\0" No_argument "u"
"alternative\0" No_argument "a"
"name\0" Required_argument "n"
;
#endif
int getopt_main(int argc, char *argv[]);
int getopt_main(int argc, char *argv[])
{
char *optstr = NULL;
char *name = NULL;
unsigned opt;
const char *compatible;
char *s_arg;
#if ENABLE_GETOPT_LONG
struct option *long_options = NULL;
llist_t *l_arg = NULL;
#endif
compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */
if (argc == 1) {
if (compatible) {
/* For some reason, the original getopt gave no error
when there were no arguments. */
printf(" --\n");
return 0;
}
bb_error_msg_and_die("missing optstring argument");
}
if (argv[1][0] != '-' || compatible) {
char *s;
option_mask32 |= OPT_u; /* quoting off */
s = xstrdup(argv[1] + strspn(argv[1], "-+"));
argv[1] = argv[0];
return generate_output(argv+1, argc-1, s, long_options);
}
#if !ENABLE_GETOPT_LONG
opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
#else
applet_long_options = getopt_longopts;
opt_complementary = "l::";
opt = getopt32(argv, "+o:n:qQs:Tual:",
&optstr, &name, &s_arg, &l_arg);
/* Effectuate the read options for the applet itself */
while (l_arg) {
long_options = add_long_options(long_options, l_arg->data);
l_arg = l_arg->link;
}
#endif
if (opt & OPT_s) {
set_shell(s_arg);
}
if (opt & OPT_T) {
return 4;
}
/* All options controlling the applet have now been parsed */
if (!optstr) {
if (optind >= argc)
bb_error_msg_and_die("missing optstring argument");
optstr = argv[optind++];
}
argv[optind-1] = name ? name : argv[0];
return generate_output(argv+optind-1, argc-optind+1, optstr, long_options);
}