source: branches/samba-3.3.x/source/popt/popthelp.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 4 -*- */

/*@-type@*/
/** \ingroup popt
 * \file popt/popthelp.c
 */

/* (C) 1998-2002 Red Hat, Inc. -- Licensing details are in the COPYING
   file accompanying popt source distributions, available from 
   ftp://ftp.rpm.org/pub/rpm/dist. */

#include "system.h"
#include "poptint.h"

/**
 * Display arguments.
 * @param con           context
 * @param foo           (unused)
 * @param key           option(s)
 * @param arg           (unused)
 * @param data          (unused)
 */
static void displayArgs(poptContext con,
                /*@unused@*/ enum poptCallbackReason foo,
                struct poptOption * key, 
                /*@unused@*/ const char * arg, /*@unused@*/ void * data)
        /*@globals fileSystem@*/
        /*@modifies fileSystem@*/
{
    if (key->shortName == '?')
        poptPrintHelp(con, stdout, 0);
    else
        poptPrintUsage(con, stdout, 0);
    exit(0);
}

#ifdef  NOTYET
/*@unchecked@*/
static int show_option_defaults = 0;
#endif

/**
 * Empty table marker to enable displaying popt alias/exec options.
 */
/*@observer@*/ /*@unchecked@*/
struct poptOption poptAliasOptions[] = {
    POPT_TABLEEND
};

/**
 * Auto help table options.
 */
/*@-castfcnptr@*/
/*@observer@*/ /*@unchecked@*/
struct poptOption poptHelpOptions[] = {
  { NULL, '\0', POPT_ARG_CALLBACK, (void *)&displayArgs, '\0', NULL, NULL },
  { "help", '?', 0, NULL, '?', N_("Show this help message"), NULL },
  { "usage", '\0', 0, NULL, 'u', N_("Display brief usage message"), NULL },
#ifdef  NOTYET
  { "defaults", '\0', POPT_ARG_NONE, &show_option_defaults, 0,
        N_("Display option defaults in message"), NULL },
#endif
    POPT_TABLEEND
} ;
/*@=castfcnptr@*/

/**
 * @param table         option(s)
 */
/*@observer@*/ /*@null@*/ static const char *
getTableTranslationDomain(/*@null@*/ const struct poptOption *table)
        /*@*/
{
    const struct poptOption *opt;

    if (table != NULL)
    for (opt = table; opt->longName || opt->shortName || opt->arg; opt++) {
        if (opt->argInfo == POPT_ARG_INTL_DOMAIN)
            return (char *)opt->arg;
    }
    return NULL;
}

/**
 * @param opt           option(s)
 * @param translation_domain    translation domain
 */
/*@observer@*/ /*@null@*/ static const char *
getArgDescrip(const struct poptOption * opt,
                /*@-paramuse@*/ /* FIX: i18n macros disabled with lclint */
                /*@null@*/ const char * translation_domain)
                /*@=paramuse@*/
        /*@*/
{
    if (!(opt->argInfo & POPT_ARG_MASK)) return NULL;

    if (opt == (poptHelpOptions + 1) || opt == (poptHelpOptions + 2))
        if (opt->argDescrip) return POPT_(opt->argDescrip);

    if (opt->argDescrip) return D_(translation_domain, opt->argDescrip);

    switch (opt->argInfo & POPT_ARG_MASK) {
    case POPT_ARG_NONE:         return POPT_("NONE");
#ifdef  DYING
    case POPT_ARG_VAL:          return POPT_("VAL");
#else
    case POPT_ARG_VAL:          return NULL;
#endif
    case POPT_ARG_INT:          return POPT_("INT");
    case POPT_ARG_LONG:         return POPT_("LONG");
    case POPT_ARG_STRING:       return POPT_("STRING");
    case POPT_ARG_FLOAT:        return POPT_("FLOAT");
    case POPT_ARG_DOUBLE:       return POPT_("DOUBLE");
    default:                    return POPT_("ARG");
    }
}

/**
 * Display default value for an option.
 * @param lineLength
 * @param opt           option(s)
 * @param translation_domain    translation domain
 * @return
 */
static /*@only@*/ /*@null@*/ char *
singleOptionDefaultValue(int lineLength,
                const struct poptOption * opt,
                /*@-paramuse@*/ /* FIX: i18n macros disabled with lclint */
                /*@null@*/ const char * translation_domain)
                /*@=paramuse@*/
        /*@*/
{
    const char * defstr = D_(translation_domain, "default");
    char * le = (char *)malloc(4*lineLength + 1);
    char * l = le;

    if (le == NULL) return NULL;        /* XXX can't happen */
/*@-boundswrite@*/
    *le = '\0';
    *le++ = '(';
    strcpy(le, defstr); le += strlen(le);
    *le++ = ':';
    *le++ = ' ';
    if (opt->arg)       /* XXX programmer error */
    switch (opt->argInfo & POPT_ARG_MASK) {
    case POPT_ARG_VAL:
    case POPT_ARG_INT:
    {   long aLong = *((int *)opt->arg);
        le += sprintf(le, "%ld", aLong);
    }   break;
    case POPT_ARG_LONG:
    {   long aLong = *((long *)opt->arg);
        le += sprintf(le, "%ld", aLong);
    }   break;
    case POPT_ARG_FLOAT:
    {   double aDouble = *((float *)opt->arg);
        le += sprintf(le, "%g", aDouble);
    }   break;
    case POPT_ARG_DOUBLE:
    {   double aDouble = *((double *)opt->arg);
        le += sprintf(le, "%g", aDouble);
    }   break;
    case POPT_ARG_STRING:
    {   const char * s = *(const char **)opt->arg;
        if (s == NULL) {
            strcpy(le, "null"); le += strlen(le);
        } else {
            size_t slen = 4*lineLength - (le - l) - sizeof("\"...\")");
            *le++ = '"';
            strncpy(le, s, slen); le[slen] = '\0'; le += strlen(le);
            if (slen < strlen(s)) {
                strcpy(le, "...");      le += strlen(le);
            }
            *le++ = '"';
        }
    }   break;
    case POPT_ARG_NONE:
    default:
        l = (char *)_free(l);
        return NULL;
        /*@notreached@*/ break;
    }
    *le++ = ')';
    *le = '\0';
/*@=boundswrite@*/

    return l;
}

/**
 * Display help text for an option.
 * @param fp            output file handle
 * @param maxLeftCol
 * @param opt           option(s)
 * @param translation_domain    translation domain
 */
static void singleOptionHelp(FILE * fp, int maxLeftCol,
                const struct poptOption * opt,
                /*@null@*/ const char * translation_domain)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    int indentLength = maxLeftCol + 5;
    int lineLength = 79 - indentLength;
    const char * help = D_(translation_domain, opt->descrip);
    const char * argDescrip = getArgDescrip(opt, translation_domain);
    int helpLength;
    char * defs = NULL;
    char * left;
    int nb = maxLeftCol + 1;

    /* Make sure there's more than enough room in target buffer. */
    if (opt->longName)  nb += strlen(opt->longName);
    if (argDescrip)     nb += strlen(argDescrip);

/*@-boundswrite@*/
    left = (char *)malloc(nb);
    if (left == NULL) return;   /* XXX can't happen */
    left[0] = '\0';
    left[maxLeftCol] = '\0';

    if (opt->longName && opt->shortName)
        sprintf(left, "-%c, %s%s", opt->shortName,
                ((opt->argInfo & POPT_ARGFLAG_ONEDASH) ? "-" : "--"),
                opt->longName);
    else if (opt->shortName != '\0')
        sprintf(left, "-%c", opt->shortName);
    else if (opt->longName)
        sprintf(left, "%s%s",
                ((opt->argInfo & POPT_ARGFLAG_ONEDASH) ? "-" : "--"),
                opt->longName);
    if (!*left) goto out;

    if (argDescrip) {
        char * le = left + strlen(left);

        if (opt->argInfo & POPT_ARGFLAG_OPTIONAL)
            *le++ = '[';

        /* Choose type of output */
        /*@-branchstate@*/
        if (opt->argInfo & POPT_ARGFLAG_SHOW_DEFAULT) {
            defs = singleOptionDefaultValue(lineLength, opt, translation_domain);
            if (defs) {
                char * t = (char *)malloc((help ? strlen(help) : 0) +
                                strlen(defs) + sizeof(" "));
                if (t) {
                    char * te = t;
                    *te = '\0';
                    if (help) {
                        strcpy(te, help);       te += strlen(te);
                    }
                    *te++ = ' ';
                    strcpy(te, defs);
                    defs = (char *)_free(defs);
                }
                defs = t;
            }
        }
        /*@=branchstate@*/

        if (opt->argDescrip == NULL) {
            switch (opt->argInfo & POPT_ARG_MASK) {
            case POPT_ARG_NONE:
                break;
            case POPT_ARG_VAL:
#ifdef  NOTNOW  /* XXX pug ugly nerdy output */
            {   long aLong = opt->val;
                int ops = (opt->argInfo & POPT_ARGFLAG_LOGICALOPS);
                int negate = (opt->argInfo & POPT_ARGFLAG_NOT);

                /* Don't bother displaying typical values */
                if (!ops && (aLong == 0L || aLong == 1L || aLong == -1L))
                    break;
                *le++ = '[';
                switch (ops) {
                case POPT_ARGFLAG_OR:
                    *le++ = '|';
                    /*@innerbreak@*/ break;
                case POPT_ARGFLAG_AND:
                    *le++ = '&';
                    /*@innerbreak@*/ break;
                case POPT_ARGFLAG_XOR:
                    *le++ = '^';
                    /*@innerbreak@*/ break;
                default:
                    /*@innerbreak@*/ break;
                }
                *le++ = '=';
                if (negate) *le++ = '~';
                /*@-formatconst@*/
                le += sprintf(le, (ops ? "0x%lx" : "%ld"), aLong);
                /*@=formatconst@*/
                *le++ = ']';
            }
#endif
                break;
            case POPT_ARG_INT:
            case POPT_ARG_LONG:
            case POPT_ARG_FLOAT:
            case POPT_ARG_DOUBLE:
            case POPT_ARG_STRING:
                *le++ = '=';
                strcpy(le, argDescrip);         le += strlen(le);
                break;
            default:
                break;
            }
        } else {
            *le++ = '=';
            strcpy(le, argDescrip);             le += strlen(le);
        }
        if (opt->argInfo & POPT_ARGFLAG_OPTIONAL)
            *le++ = ']';
        *le = '\0';
    }
/*@=boundswrite@*/

    if (help)
        fprintf(fp,"  %-*s   ", maxLeftCol, left);
    else {
        fprintf(fp,"  %s\n", left);
        goto out;
    }

    left = (char *)_free(left);
    if (defs) {
        help = defs; defs = NULL;
    }

    helpLength = strlen(help);
/*@-boundsread@*/
    while (helpLength > lineLength) {
        const char * ch;
        char format[16];

        ch = help + lineLength - 1;
        while (ch > help && !isspace(*ch)) ch--;
        if (ch == help) break;          /* give up */
        while (ch > (help + 1) && isspace(*ch)) ch--;
        ch++;

        sprintf(format, "%%.%ds\n%%%ds", (int) (ch - help), indentLength);
        /*@-formatconst@*/
        fprintf(fp, format, help, " ");
        /*@=formatconst@*/
        help = ch;
        while (isspace(*help) && *help) help++;
        helpLength = strlen(help);
    }
/*@=boundsread@*/

    if (helpLength) fprintf(fp, "%s\n", help);

out:
    /*@-dependenttrans@*/
    defs = (char *)_free(defs);
    /*@=dependenttrans@*/
    left = (char *)_free(left);
}

/**
 * @param opt           option(s)
 * @param translation_domain    translation domain
 */
static int maxArgWidth(const struct poptOption * opt,
                       /*@null@*/ const char * translation_domain)
        /*@*/
{
    int max = 0;
    int len = 0;
    const char * s;
    
    if (opt != NULL)
    while (opt->longName || opt->shortName || opt->arg) {
        if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) {
            if (opt->arg)       /* XXX program error */
            len = maxArgWidth((const struct poptOption *)opt->arg, translation_domain);
            if (len > max) max = len;
        } else if (!(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN)) {
            len = sizeof("  ")-1;
            if (opt->shortName != '\0') len += sizeof("-X")-1;
            if (opt->shortName != '\0' && opt->longName) len += sizeof(", ")-1;
            if (opt->longName) {
                len += ((opt->argInfo & POPT_ARGFLAG_ONEDASH)
                        ? sizeof("-")-1 : sizeof("--")-1);
                len += strlen(opt->longName);
            }

            s = getArgDescrip(opt, translation_domain);
            if (s)
                len += sizeof("=")-1 + strlen(s);
            if (opt->argInfo & POPT_ARGFLAG_OPTIONAL) len += sizeof("[]")-1;
            if (len > max) max = len;
        }

        opt++;
    }
    
    return max;
}

/**
 * Display popt alias and exec help.
 * @param fp            output file handle
 * @param items         alias/exec array
 * @param nitems        no. of alias/exec entries
 * @param left
 * @param translation_domain    translation domain
 */
static void itemHelp(FILE * fp,
                /*@null@*/ poptItem items, int nitems, int left,
                /*@null@*/ const char * translation_domain)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    poptItem item;
    int i;

    if (items != NULL)
    for (i = 0, item = items; i < nitems; i++, item++) {
        const struct poptOption * opt;
        opt = &item->option;
        if ((opt->longName || opt->shortName) &&
            !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
            singleOptionHelp(fp, left, opt, translation_domain);
    }
}

/**
 * Display help text for a table of options.
 * @param con           context
 * @param fp            output file handle
 * @param table         option(s)
 * @param left
 * @param translation_domain    translation domain
 */
static void singleTableHelp(poptContext con, FILE * fp,
                /*@null@*/ const struct poptOption * table, int left,
                /*@null@*/ const char * translation_domain)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    const struct poptOption * opt;
    const char *sub_transdom;

    if (table == poptAliasOptions) {
        itemHelp(fp, con->aliases, con->numAliases, left, NULL);
        itemHelp(fp, con->execs, con->numExecs, left, NULL);
        return;
    }

    if (table != NULL)
    for (opt = table; (opt->longName || opt->shortName || opt->arg); opt++) {
        if ((opt->longName || opt->shortName) && 
            !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN))
            singleOptionHelp(fp, left, opt, translation_domain);
    }

    if (table != NULL)
    for (opt = table; (opt->longName || opt->shortName || opt->arg); opt++) {
        if ((opt->argInfo & POPT_ARG_MASK) != POPT_ARG_INCLUDE_TABLE)
            continue;
        sub_transdom = getTableTranslationDomain(
            (const struct poptOption *)opt->arg);
        if (sub_transdom == NULL)
            sub_transdom = translation_domain;
            
        if (opt->descrip)
            fprintf(fp, "\n%s\n", D_(sub_transdom, opt->descrip));

        singleTableHelp(con, fp, (const struct poptOption *)opt->arg, left, sub_transdom);
    }
}

/**
 * @param con           context
 * @param fp            output file handle
 */
static int showHelpIntro(poptContext con, FILE * fp)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    int len = 6;
    const char * fn;

    fprintf(fp, POPT_("Usage:"));
    if (!(con->flags & POPT_CONTEXT_KEEP_FIRST)) {
/*@-boundsread@*/
        /*@-nullderef@*/        /* LCL: wazzup? */
        fn = con->optionStack->argv[0];
        /*@=nullderef@*/
/*@=boundsread@*/
        if (fn == NULL) return len;
        if (strchr(fn, '/')) fn = strrchr(fn, '/') + 1;
        fprintf(fp, " %s", fn);
        len += strlen(fn) + 1;
    }

    return len;
}

void poptPrintHelp(poptContext con, FILE * fp, /*@unused@*/ int flags)
{
    int leftColWidth;

    (void) showHelpIntro(con, fp);
    if (con->otherHelp)
        fprintf(fp, " %s\n", con->otherHelp);
    else
        fprintf(fp, " %s\n", POPT_("[OPTION...]"));

    leftColWidth = maxArgWidth(con->options, NULL);
    singleTableHelp(con, fp, con->options, leftColWidth, NULL);
}

/**
 * @param fp            output file handle
 * @param cursor
 * @param opt           option(s)
 * @param translation_domain    translation domain
 */
static int singleOptionUsage(FILE * fp, int cursor,
                const struct poptOption * opt,
                /*@null@*/ const char *translation_domain)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    int len = 4;
    char shortStr[2] = { '\0', '\0' };
    const char * item = shortStr;
    const char * argDescrip = getArgDescrip(opt, translation_domain);

    if (opt->shortName != '\0' && opt->longName != NULL) {
        len += 2;
        if (!(opt->argInfo & POPT_ARGFLAG_ONEDASH)) len++;
        len += strlen(opt->longName);
    } else if (opt->shortName != '\0') {
        len++;
        shortStr[0] = opt->shortName;
        shortStr[1] = '\0';
    } else if (opt->longName) {
        len += strlen(opt->longName);
        if (!(opt->argInfo & POPT_ARGFLAG_ONEDASH)) len++;
        item = opt->longName;
    }

    if (len == 4) return cursor;

    if (argDescrip) 
        len += strlen(argDescrip) + 1;

    if ((cursor + len) > 79) {
        fprintf(fp, "\n       ");
        cursor = 7;
    } 

    if (opt->longName && opt->shortName) {
        fprintf(fp, " [-%c|-%s%s%s%s]",
            opt->shortName, ((opt->argInfo & POPT_ARGFLAG_ONEDASH) ? "" : "-"),
            opt->longName,
            (argDescrip ? " " : ""),
            (argDescrip ? argDescrip : ""));
    } else {
        fprintf(fp, " [-%s%s%s%s]",
            ((opt->shortName || (opt->argInfo & POPT_ARGFLAG_ONEDASH)) ? "" : "-"),
            item,
            (argDescrip ? (opt->shortName != '\0' ? " " : "=") : ""),
            (argDescrip ? argDescrip : ""));
    }

    return cursor + len + 1;
}

/**
 * Display popt alias and exec usage.
 * @param fp            output file handle
 * @param cursor
 * @param item          alias/exec array
 * @param nitems        no. of ara/exec entries
 * @param translation_domain    translation domain
 */
static int itemUsage(FILE * fp, int cursor, poptItem item, int nitems,
                /*@null@*/ const char * translation_domain)
        /*@globals fileSystem @*/
        /*@modifies *fp, fileSystem @*/
{
    int i;

    /*@-branchstate@*/          /* FIX: W2DO? */
    if (item != NULL)
    for (i = 0; i < nitems; i++, item++) {
        const struct poptOption * opt;
        opt = &item->option;
        if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INTL_DOMAIN) {
            translation_domain = (const char *)opt->arg;
        } else if ((opt->longName || opt->shortName) &&
                 !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN)) {
            cursor = singleOptionUsage(fp, cursor, opt, translation_domain);
        }
    }
    /*@=branchstate@*/

    return cursor;
}

/**
 * Keep track of option tables already processed.
 */
typedef struct poptDone_s {
    int nopts;
    int maxopts;
    const void ** opts;
} * poptDone;

/**
 * Display usage text for a table of options.
 * @param con           context
 * @param fp            output file handle
 * @param cursor
 * @param opt           option(s)
 * @param translation_domain    translation domain
 * @param done          tables already processed
 * @return
 */
static int singleTableUsage(poptContext con, FILE * fp, int cursor,
                /*@null@*/ const struct poptOption * opt,
                /*@null@*/ const char * translation_domain,
                /*@null@*/ poptDone done)
        /*@globals fileSystem @*/
        /*@modifies *fp, done, fileSystem @*/
{
    /*@-branchstate@*/          /* FIX: W2DO? */
    if (opt != NULL)
    for (; (opt->longName || opt->shortName || opt->arg) ; opt++) {
        if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INTL_DOMAIN) {
            translation_domain = (const char *)opt->arg;
        } else if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE) {
            if (done) {
                int i = 0;
                for (i = 0; i < done->nopts; i++) {
/*@-boundsread@*/
                    const void * that = done->opts[i];
/*@=boundsread@*/
                    if (that == NULL || that != opt->arg)
                        /*@innercontinue@*/ continue;
                    /*@innerbreak@*/ break;
                }
                /* Skip if this table has already been processed. */
                if (opt->arg == NULL || i < done->nopts)
                    continue;
/*@-boundswrite@*/
                if (done->nopts < done->maxopts)
                    done->opts[done->nopts++] = (const void *) opt->arg;
/*@=boundswrite@*/
            }
            cursor = singleTableUsage(con, fp, cursor, (const struct poptOption *)opt->arg,
                        translation_domain, done);
        } else if ((opt->longName || opt->shortName) &&
                 !(opt->argInfo & POPT_ARGFLAG_DOC_HIDDEN)) {
            cursor = singleOptionUsage(fp, cursor, opt, translation_domain);
        }
    }
    /*@=branchstate@*/

    return cursor;
}

/**
 * Return concatenated short options for display.
 * @todo Sub-tables should be recursed.
 * @param opt           option(s)
 * @param fp            output file handle
 * @retval str          concatenation of short options
 * @return              length of display string
 */
static int showShortOptions(const struct poptOption * opt, FILE * fp,
                /*@null@*/ char * str)
        /*@globals fileSystem @*/
        /*@modifies *str, *fp, fileSystem @*/
        /*@requires maxRead(str) >= 0 @*/
{
    /* bufsize larger then the ascii set, lazy alloca on top level call. */
    char * s = (str != NULL ? str : (char *)memset(alloca(300), 0, 300));
    int len = 0;

/*@-boundswrite@*/
    if (opt != NULL)
    for (; (opt->longName || opt->shortName || opt->arg); opt++) {
        if (opt->shortName && !(opt->argInfo & POPT_ARG_MASK))
            s[strlen(s)] = opt->shortName;
        else if ((opt->argInfo & POPT_ARG_MASK) == POPT_ARG_INCLUDE_TABLE)
            if (opt->arg)       /* XXX program error */
                len = showShortOptions(
                    (const struct poptOption *)opt->arg, fp, s);
    } 
/*@=boundswrite@*/

    /* On return to top level, print the short options, return print length. */
    if (s == str && *s != '\0') {
        fprintf(fp, " [-%s]", s);
        len = strlen(s) + sizeof(" [-]")-1;
    }
    return len;
}

void poptPrintUsage(poptContext con, FILE * fp, /*@unused@*/ int flags)
{
    poptDone done = (poptDone)memset(alloca(sizeof(*done)), 0, sizeof(*done));
    int cursor;

    done->nopts = 0;
    done->maxopts = 64;
    cursor = done->maxopts * sizeof(*done->opts);
/*@-boundswrite@*/
    done->opts = (const void **)memset(alloca(cursor), 0, cursor);
    done->opts[done->nopts++] = (const void *) con->options;
/*@=boundswrite@*/

    cursor = showHelpIntro(con, fp);
    cursor += showShortOptions(con->options, fp, NULL);
    cursor = singleTableUsage(con, fp, cursor, con->options, NULL, done);
    cursor = itemUsage(fp, cursor, con->aliases, con->numAliases, NULL);
    cursor = itemUsage(fp, cursor, con->execs, con->numExecs, NULL);

    if (con->otherHelp) {
        cursor += strlen(con->otherHelp) + 1;
        if (cursor > 79) fprintf(fp, "\n       ");
        fprintf(fp, " %s", con->otherHelp);
    }

    fprintf(fp, "\n");
}

void poptSetOtherOptionHelp(poptContext con, const char * text)
{
    con->otherHelp = (const char *)_free(con->otherHelp);
    con->otherHelp = xstrdup(text);
}
/*@=type@*/