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| -rw-r--r-- | lib/getopt.c | 811 |
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diff --git a/lib/getopt.c b/lib/getopt.c new file mode 100644 index 0000000..128dc7f --- /dev/null +++ b/lib/getopt.c @@ -0,0 +1,811 @@ +/* Getopt for GNU. + Copyright (C) 1987-2022 Free Software Foundation, Inc. + This file is part of the GNU C Library and is also part of gnulib. + Patches to this file should be submitted to both projects. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _LIBC +# include <config.h> +#endif + +#include "getopt.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#ifdef _LIBC +/* When used as part of glibc, error printing must be done differently + for standards compliance. getopt is not a cancellation point, so + it must not call functions that are, and it is specified by an + older standard than stdio locking, so it must not refer to + functions in the "user namespace" related to stdio locking. + Finally, it must use glibc's internal message translation so that + the messages are looked up in the proper text domain. */ +# include <libintl.h> +# define fprintf __fxprintf_nocancel +# define flockfile(fp) _IO_flockfile (fp) +# define funlockfile(fp) _IO_funlockfile (fp) +#else +# include "gettext.h" +# define _(msgid) gettext (msgid) +/* When used standalone, flockfile and funlockfile might not be + available. */ +# if (!defined _POSIX_THREAD_SAFE_FUNCTIONS \ + || (defined _WIN32 && ! defined __CYGWIN__)) +# define flockfile(fp) /* nop */ +# define funlockfile(fp) /* nop */ +# endif +/* When used standalone, do not attempt to use alloca. */ +# define __libc_use_alloca(size) 0 +# undef alloca +# define alloca(size) (abort (), (void *)0) +#endif + +/* This implementation of 'getopt' has three modes for handling + options interspersed with non-option arguments. It can stop + scanning for options at the first non-option argument encountered, + as POSIX specifies. It can continue scanning for options after the + first non-option argument, but permute 'argv' as it goes so that, + after 'getopt' is done, all the options precede all the non-option + arguments and 'optind' points to the first non-option argument. + Or, it can report non-option arguments as if they were arguments to + the option character '\x01'. + + The default behavior of 'getopt_long' is to permute the argument list. + When this implementation is used standalone, the default behavior of + 'getopt' is to stop at the first non-option argument, but when it is + used as part of GNU libc it also permutes the argument list. In both + cases, setting the environment variable POSIXLY_CORRECT to any value + disables permutation. + + If the first character of the OPTSTRING argument to 'getopt' or + 'getopt_long' is '+', both functions will stop at the first + non-option argument. If it is '-', both functions will report + non-option arguments as arguments to the option character '\x01'. */ + +#include "getopt_int.h" + +/* For communication from 'getopt' to the caller. + When 'getopt' finds an option that takes an argument, + the argument value is returned here. + Also, when 'ordering' is RETURN_IN_ORDER, + each non-option ARGV-element is returned here. */ + +char *optarg; + +/* Index in ARGV of the next element to be scanned. + This is used for communication to and from the caller + and for communication between successive calls to 'getopt'. + + On entry to 'getopt', zero means this is the first call; initialize. + + When 'getopt' returns -1, this is the index of the first of the + non-option elements that the caller should itself scan. + + Otherwise, 'optind' communicates from one call to the next + how much of ARGV has been scanned so far. */ + +/* 1003.2 says this must be 1 before any call. */ +int optind = 1; + +/* Callers store zero here to inhibit the error message + for unrecognized options. */ + +int opterr = 1; + +/* Set to an option character which was unrecognized. + This must be initialized on some systems to avoid linking in the + system's own getopt implementation. */ + +int optopt = '?'; + +/* Keep a global copy of all internal members of getopt_data. */ + +static struct _getopt_data getopt_data; + +/* Exchange two adjacent subsequences of ARGV. + One subsequence is elements [first_nonopt,last_nonopt) + which contains all the non-options that have been skipped so far. + The other is elements [last_nonopt,optind), which contains all + the options processed since those non-options were skipped. + + 'first_nonopt' and 'last_nonopt' are relocated so that they describe + the new indices of the non-options in ARGV after they are moved. */ + +static void +exchange (char **argv, struct _getopt_data *d) +{ + int bottom = d->__first_nonopt; + int middle = d->__last_nonopt; + int top = d->optind; + char *tem; + + /* Exchange the shorter segment with the far end of the longer segment. + That puts the shorter segment into the right place. + It leaves the longer segment in the right place overall, + but it consists of two parts that need to be swapped next. */ + + while (top > middle && middle > bottom) + { + if (top - middle > middle - bottom) + { + /* Bottom segment is the short one. */ + int len = middle - bottom; + int i; + + /* Swap it with the top part of the top segment. */ + for (i = 0; i < len; i++) + { + tem = argv[bottom + i]; + argv[bottom + i] = argv[top - (middle - bottom) + i]; + argv[top - (middle - bottom) + i] = tem; + } + /* Exclude the moved bottom segment from further swapping. */ + top -= len; + } + else + { + /* Top segment is the short one. */ + int len = top - middle; + int i; + + /* Swap it with the bottom part of the bottom segment. */ + for (i = 0; i < len; i++) + { + tem = argv[bottom + i]; + argv[bottom + i] = argv[middle + i]; + argv[middle + i] = tem; + } + /* Exclude the moved top segment from further swapping. */ + bottom += len; + } + } + + /* Update records for the slots the non-options now occupy. */ + + d->__first_nonopt += (d->optind - d->__last_nonopt); + d->__last_nonopt = d->optind; +} + +/* Process the argument starting with d->__nextchar as a long option. + d->optind should *not* have been advanced over this argument. + + If the value returned is -1, it was not actually a long option, the + state is unchanged, and the argument should be processed as a set + of short options (this can only happen when long_only is true). + Otherwise, the option (and its argument, if any) have been consumed + and the return value is the value to return from _getopt_internal_r. */ +static int +process_long_option (int argc, char **argv, const char *optstring, + const struct option *longopts, int *longind, + int long_only, struct _getopt_data *d, + int print_errors, const char *prefix) +{ + char *nameend; + size_t namelen; + const struct option *p; + const struct option *pfound = NULL; + int n_options; + int option_index; + + for (nameend = d->__nextchar; *nameend && *nameend != '='; nameend++) + /* Do nothing. */ ; + namelen = nameend - d->__nextchar; + + /* First look for an exact match, counting the options as a side + effect. */ + for (p = longopts, n_options = 0; p->name; p++, n_options++) + if (!strncmp (p->name, d->__nextchar, namelen) + && namelen == strlen (p->name)) + { + /* Exact match found. */ + pfound = p; + option_index = n_options; + break; + } + + if (pfound == NULL) + { + /* Didn't find an exact match, so look for abbreviations. */ + unsigned char *ambig_set = NULL; + int ambig_malloced = 0; + int ambig_fallback = 0; + int indfound = -1; + + for (p = longopts, option_index = 0; p->name; p++, option_index++) + if (!strncmp (p->name, d->__nextchar, namelen)) + { + if (pfound == NULL) + { + /* First nonexact match found. */ + pfound = p; + indfound = option_index; + } + else if (long_only + || pfound->has_arg != p->has_arg + || pfound->flag != p->flag + || pfound->val != p->val) + { + /* Second or later nonexact match found. */ + if (!ambig_fallback) + { + if (!print_errors) + /* Don't waste effort tracking the ambig set if + we're not going to print it anyway. */ + ambig_fallback = 1; + else if (!ambig_set) + { + if (__libc_use_alloca (n_options)) + ambig_set = alloca (n_options); + else if ((ambig_set = malloc (n_options)) == NULL) + /* Fall back to simpler error message. */ + ambig_fallback = 1; + else + ambig_malloced = 1; + + if (ambig_set) + { + memset (ambig_set, 0, n_options); + ambig_set[indfound] = 1; + } + } + if (ambig_set) + ambig_set[option_index] = 1; + } + } + } + + if (ambig_set || ambig_fallback) + { + if (print_errors) + { + if (ambig_fallback) + fprintf (stderr, _("%s: option '%s%s' is ambiguous\n"), + argv[0], prefix, d->__nextchar); + else + { + flockfile (stderr); + fprintf (stderr, + _("%s: option '%s%s' is ambiguous; possibilities:"), + argv[0], prefix, d->__nextchar); + + for (option_index = 0; option_index < n_options; option_index++) + if (ambig_set[option_index]) + fprintf (stderr, " '%s%s'", + prefix, longopts[option_index].name); + + /* This must use 'fprintf' even though it's only + printing a single character, so that it goes through + __fxprintf_nocancel when compiled as part of glibc. */ + fprintf (stderr, "\n"); + funlockfile (stderr); + } + } + if (ambig_malloced) + free (ambig_set); + d->__nextchar += strlen (d->__nextchar); + d->optind++; + d->optopt = 0; + return '?'; + } + + option_index = indfound; + } + + if (pfound == NULL) + { + /* Can't find it as a long option. If this is not getopt_long_only, + or the option starts with '--' or is not a valid short option, + then it's an error. */ + if (!long_only || argv[d->optind][1] == '-' + || strchr (optstring, *d->__nextchar) == NULL) + { + if (print_errors) + fprintf (stderr, _("%s: unrecognized option '%s%s'\n"), + argv[0], prefix, d->__nextchar); + + d->__nextchar = NULL; + d->optind++; + d->optopt = 0; + return '?'; + } + + /* Otherwise interpret it as a short option. */ + return -1; + } + + /* We have found a matching long option. Consume it. */ + d->optind++; + d->__nextchar = NULL; + if (*nameend) + { + /* Don't test has_arg with >, because some C compilers don't + allow it to be used on enums. */ + if (pfound->has_arg) + d->optarg = nameend + 1; + else + { + if (print_errors) + fprintf (stderr, + _("%s: option '%s%s' doesn't allow an argument\n"), + argv[0], prefix, pfound->name); + + d->optopt = pfound->val; + return '?'; + } + } + else if (pfound->has_arg == 1) + { + if (d->optind < argc) + d->optarg = argv[d->optind++]; + else + { + if (print_errors) + fprintf (stderr, + _("%s: option '%s%s' requires an argument\n"), + argv[0], prefix, pfound->name); + + d->optopt = pfound->val; + return optstring[0] == ':' ? ':' : '?'; + } + } + + if (longind != NULL) + *longind = option_index; + if (pfound->flag) + { + *(pfound->flag) = pfound->val; + return 0; + } + return pfound->val; +} + +/* Initialize internal data upon the first call to getopt. */ + +static const char * +_getopt_initialize (_GL_UNUSED int argc, + _GL_UNUSED char **argv, const char *optstring, + struct _getopt_data *d, int posixly_correct) +{ + /* Start processing options with ARGV-element 1 (since ARGV-element 0 + is the program name); the sequence of previously skipped + non-option ARGV-elements is empty. */ + if (d->optind == 0) + d->optind = 1; + + d->__first_nonopt = d->__last_nonopt = d->optind; + d->__nextchar = NULL; + + /* Determine how to handle the ordering of options and nonoptions. */ + if (optstring[0] == '-') + { + d->__ordering = RETURN_IN_ORDER; + ++optstring; + } + else if (optstring[0] == '+') + { + d->__ordering = REQUIRE_ORDER; + ++optstring; + } + else if (posixly_correct || !!getenv ("POSIXLY_CORRECT")) + d->__ordering = REQUIRE_ORDER; + else + d->__ordering = PERMUTE; + + d->__initialized = 1; + return optstring; +} + +/* Scan elements of ARGV (whose length is ARGC) for option characters + given in OPTSTRING. + + If an element of ARGV starts with '-', and is not exactly "-" or "--", + then it is an option element. The characters of this element + (aside from the initial '-') are option characters. If 'getopt' + is called repeatedly, it returns successively each of the option characters + from each of the option elements. + + If 'getopt' finds another option character, it returns that character, + updating 'optind' and 'nextchar' so that the next call to 'getopt' can + resume the scan with the following option character or ARGV-element. + + If there are no more option characters, 'getopt' returns -1. + Then 'optind' is the index in ARGV of the first ARGV-element + that is not an option. (The ARGV-elements have been permuted + so that those that are not options now come last.) + + OPTSTRING is a string containing the legitimate option characters. + If an option character is seen that is not listed in OPTSTRING, + return '?' after printing an error message. If you set 'opterr' to + zero, the error message is suppressed but we still return '?'. + + If a char in OPTSTRING is followed by a colon, that means it wants an arg, + so the following text in the same ARGV-element, or the text of the following + ARGV-element, is returned in 'optarg'. Two colons mean an option that + wants an optional arg; if there is text in the current ARGV-element, + it is returned in 'optarg', otherwise 'optarg' is set to zero. + + If OPTSTRING starts with '-' or '+', it requests different methods of + handling the non-option ARGV-elements. + See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above. + + Long-named options begin with '--' instead of '-'. + Their names may be abbreviated as long as the abbreviation is unique + or is an exact match for some defined option. If they have an + argument, it follows the option name in the same ARGV-element, separated + from the option name by a '=', or else the in next ARGV-element. + When 'getopt' finds a long-named option, it returns 0 if that option's + 'flag' field is nonzero, the value of the option's 'val' field + if the 'flag' field is zero. + + The elements of ARGV aren't really const, because we permute them. + But we pretend they're const in the prototype to be compatible + with other systems. + + LONGOPTS is a vector of 'struct option' terminated by an + element containing a name which is zero. + + LONGIND returns the index in LONGOPT of the long-named option found. + It is only valid when a long-named option has been found by the most + recent call. + + If LONG_ONLY is nonzero, '-' as well as '--' can introduce + long-named options. */ + +int +_getopt_internal_r (int argc, char **argv, const char *optstring, + const struct option *longopts, int *longind, + int long_only, struct _getopt_data *d, int posixly_correct) +{ + int print_errors = d->opterr; + + if (argc < 1) + return -1; + + d->optarg = NULL; + + if (d->optind == 0 || !d->__initialized) + optstring = _getopt_initialize (argc, argv, optstring, d, posixly_correct); + else if (optstring[0] == '-' || optstring[0] == '+') + optstring++; + + if (optstring[0] == ':') + print_errors = 0; + + /* Test whether ARGV[optind] points to a non-option argument. */ +#define NONOPTION_P (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0') + + if (d->__nextchar == NULL || *d->__nextchar == '\0') + { + /* Advance to the next ARGV-element. */ + + /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been + moved back by the user (who may also have changed the arguments). */ + if (d->__last_nonopt > d->optind) + d->__last_nonopt = d->optind; + if (d->__first_nonopt > d->optind) + d->__first_nonopt = d->optind; + + if (d->__ordering == PERMUTE) + { + /* If we have just processed some options following some non-options, + exchange them so that the options come first. */ + + if (d->__first_nonopt != d->__last_nonopt + && d->__last_nonopt != d->optind) + exchange (argv, d); + else if (d->__last_nonopt != d->optind) + d->__first_nonopt = d->optind; + + /* Skip any additional non-options + and extend the range of non-options previously skipped. */ + + while (d->optind < argc && NONOPTION_P) + d->optind++; + d->__last_nonopt = d->optind; + } + + /* The special ARGV-element '--' means premature end of options. + Skip it like a null option, + then exchange with previous non-options as if it were an option, + then skip everything else like a non-option. */ + + if (d->optind != argc && !strcmp (argv[d->optind], "--")) + { + d->optind++; + + if (d->__first_nonopt != d->__last_nonopt + && d->__last_nonopt != d->optind) + exchange (argv, d); + else if (d->__first_nonopt == d->__last_nonopt) + d->__first_nonopt = d->optind; + d->__last_nonopt = argc; + + d->optind = argc; + } + + /* If we have done all the ARGV-elements, stop the scan + and back over any non-options that we skipped and permuted. */ + + if (d->optind == argc) + { + /* Set the next-arg-index to point at the non-options + that we previously skipped, so the caller will digest them. */ + if (d->__first_nonopt != d->__last_nonopt) + d->optind = d->__first_nonopt; + return -1; + } + + /* If we have come to a non-option and did not permute it, + either stop the scan or describe it to the caller and pass it by. */ + + if (NONOPTION_P) + { + if (d->__ordering == REQUIRE_ORDER) + return -1; + d->optarg = argv[d->optind++]; + return 1; + } + + /* We have found another option-ARGV-element. + Check whether it might be a long option. */ + if (longopts) + { + if (argv[d->optind][1] == '-') + { + /* "--foo" is always a long option. The special option + "--" was handled above. */ + d->__nextchar = argv[d->optind] + 2; + return process_long_option (argc, argv, optstring, longopts, + longind, long_only, d, + print_errors, "--"); + } + + /* If long_only and the ARGV-element has the form "-f", + where f is a valid short option, don't consider it an + abbreviated form of a long option that starts with f. + Otherwise there would be no way to give the -f short + option. + + On the other hand, if there's a long option "fubar" and + the ARGV-element is "-fu", do consider that an + abbreviation of the long option, just like "--fu", and + not "-f" with arg "u". + + This distinction seems to be the most useful approach. */ + if (long_only && (argv[d->optind][2] + || !strchr (optstring, argv[d->optind][1]))) + { + int code; + d->__nextchar = argv[d->optind] + 1; + code = process_long_option (argc, argv, optstring, longopts, + longind, long_only, d, + print_errors, "-"); + if (code != -1) + return code; + } + } + + /* It is not a long option. Skip the initial punctuation. */ + d->__nextchar = argv[d->optind] + 1; + } + + /* Look at and handle the next short option-character. */ + + { + char c = *d->__nextchar++; + const char *temp = strchr (optstring, c); + + /* Increment 'optind' when we start to process its last character. */ + if (*d->__nextchar == '\0') + ++d->optind; + + if (temp == NULL || c == ':' || c == ';') + { + if (print_errors) + fprintf (stderr, _("%s: invalid option -- '%c'\n"), argv[0], c); + d->optopt = c; + return '?'; + } + + /* Convenience. Treat POSIX -W foo same as long option --foo */ + if (temp[0] == 'W' && temp[1] == ';' && longopts != NULL) + { + /* This is an option that requires an argument. */ + if (*d->__nextchar != '\0') + d->optarg = d->__nextchar; + else if (d->optind == argc) + { + if (print_errors) + fprintf (stderr, + _("%s: option requires an argument -- '%c'\n"), + argv[0], c); + + d->optopt = c; + if (optstring[0] == ':') + c = ':'; + else + c = '?'; + return c; + } + else + d->optarg = argv[d->optind]; + + d->__nextchar = d->optarg; + d->optarg = NULL; + return process_long_option (argc, argv, optstring, longopts, longind, + 0 /* long_only */, d, print_errors, "-W "); + } + if (temp[1] == ':') + { + if (temp[2] == ':') + { + /* This is an option that accepts an argument optionally. */ + if (*d->__nextchar != '\0') + { + d->optarg = d->__nextchar; + d->optind++; + } + else + d->optarg = NULL; + d->__nextchar = NULL; + } + else + { + /* This is an option that requires an argument. */ + if (*d->__nextchar != '\0') + { + d->optarg = d->__nextchar; + /* If we end this ARGV-element by taking the rest as an arg, + we must advance to the next element now. */ + d->optind++; + } + else if (d->optind == argc) + { + if (print_errors) + fprintf (stderr, + _("%s: option requires an argument -- '%c'\n"), + argv[0], c); + + d->optopt = c; + if (optstring[0] == ':') + c = ':'; + else + c = '?'; + } + else + /* We already incremented 'optind' once; + increment it again when taking next ARGV-elt as argument. */ + d->optarg = argv[d->optind++]; + d->__nextchar = NULL; + } + } + return c; + } +} + +int +_getopt_internal (int argc, char **argv, const char *optstring, + const struct option *longopts, int *longind, int long_only, + int posixly_correct) +{ + int result; + + getopt_data.optind = optind; + getopt_data.opterr = opterr; + + result = _getopt_internal_r (argc, argv, optstring, longopts, + longind, long_only, &getopt_data, + posixly_correct); + + optind = getopt_data.optind; + optarg = getopt_data.optarg; + optopt = getopt_data.optopt; + + return result; +} + +/* glibc gets a LSB-compliant getopt and a POSIX-complaint __posix_getopt. + Standalone applications just get a POSIX-compliant getopt. + POSIX and LSB both require these functions to take 'char *const *argv' + even though this is incorrect (because of the permutation). */ +#define GETOPT_ENTRY(NAME, POSIXLY_CORRECT) \ + int \ + NAME (int argc, char *const *argv, const char *optstring) \ + { \ + return _getopt_internal (argc, (char **)argv, optstring, \ + 0, 0, 0, POSIXLY_CORRECT); \ + } + +#ifdef _LIBC +GETOPT_ENTRY(getopt, 0) +GETOPT_ENTRY(__posix_getopt, 1) +#else +GETOPT_ENTRY(getopt, 1) +#endif + + +#ifdef TEST + +/* Compile with -DTEST to make an executable for use in testing + the above definition of 'getopt'. */ + +int +main (int argc, char **argv) +{ + int c; + int digit_optind = 0; + + while (1) + { + int this_option_optind = optind ? optind : 1; + + c = getopt (argc, argv, "abc:d:0123456789"); + if (c == -1) + break; + + switch (c) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + if (digit_optind != 0 && digit_optind != this_option_optind) + printf ("digits occur in two different argv-elements.\n"); + digit_optind = this_option_optind; + printf ("option %c\n", c); + break; + + case 'a': + printf ("option a\n"); + break; + + case 'b': + printf ("option b\n"); + break; + + case 'c': + printf ("option c with value '%s'\n", optarg); + break; + + case '?': + break; + + default: + printf ("?? getopt returned character code 0%o ??\n", c); + } + } + + if (optind < argc) + { + printf ("non-option ARGV-elements: "); + while (optind < argc) + printf ("%s ", argv[optind++]); + printf ("\n"); + } + + exit (0); +} + +#endif /* TEST */ |