source: MondoRescue/branches/stable/mindi-busybox/util-linux/getopt.c@ 1770

/* 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++]));
        puts("");
    }
    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);
}