source: MondoRescue/branches/stable/mindi-busybox/libbb/dump.c

/* vi: set sw=4 ts=4: */
/*
 * Support code for the hexdump and od applets,
 * based on code from util-linux v 2.11l
 *
 * Copyright (c) 1989
 *  The Regents of the University of California.  All rights reserved.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * Original copyright notice is retained at the end of this file.
 */

#include "libbb.h"
#include "dump.h"

enum _vflag bb_dump_vflag = FIRST;
FS *bb_dump_fshead;             /* head of format strings */
static FU *endfu;
static char **_argv;
static off_t savaddress;    /* saved address/offset in stream */
static off_t eaddress;  /* end address */
static off_t address;   /* address/offset in stream */
off_t bb_dump_skip;             /* bytes to skip */
static int exitval;         /* final exit value */
int bb_dump_blocksize;          /* data block size */
int bb_dump_length = -1;        /* max bytes to read */

static const char index_str[] ALIGN1 = ".#-+ 0123456789";

static const char size_conv_str[] ALIGN1 =
"\x1\x4\x4\x4\x4\x4\x4\x8\x8\x8\x8\010cdiouxXeEfgG";

static const char lcc[] ALIGN1 = "diouxX";

int bb_dump_size(FS * fs)
{
    FU *fu;
    int bcnt, cur_size;
    char *fmt;
    const char *p;
    int prec;

    /* figure out the data block bb_dump_size needed for each format unit */
    for (cur_size = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
        if (fu->bcnt) {
            cur_size += fu->bcnt * fu->reps;
            continue;
        }
        for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
            if (*fmt != '%')
                continue;
            /*
             * bb_dump_skip any special chars -- save precision in
             * case it's a %s format.
             */
            while (strchr(index_str + 1, *++fmt));
            if (*fmt == '.' && isdigit(*++fmt)) {
                prec = atoi(fmt);
                while (isdigit(*++fmt));
            }
            if (!(p = strchr(size_conv_str + 12, *fmt))) {
                if (*fmt == 's') {
                    bcnt += prec;
                } else if (*fmt == '_') {
                    ++fmt;
                    if ((*fmt == 'c') || (*fmt == 'p') || (*fmt == 'u')) {
                        bcnt += 1;
                    }
                }
            } else {
                bcnt += size_conv_str[p - (size_conv_str + 12)];
            }
        }
        cur_size += bcnt * fu->reps;
    }
    return cur_size;
}

static void rewrite(FS * fs)
{
    enum { NOTOKAY, USEBCNT, USEPREC } sokay;
    PR *pr, **nextpr = NULL;
    FU *fu;
    char *p1, *p2, *p3;
    char savech, *fmtp;
    const char *byte_count_str;
    int nconv, prec = 0;

    for (fu = fs->nextfu; fu; fu = fu->nextfu) {
        /*
         * break each format unit into print units; each
         * conversion character gets its own.
         */
        for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
            /* NOSTRICT */
            /* DBU:[dvae@cray.com] calloc so that forward ptrs start out NULL*/
            pr = xzalloc(sizeof(PR));
            if (!fu->nextpr)
                fu->nextpr = pr;
            /* ignore nextpr -- its unused inside the loop and is
             * uninitialized 1st time thru.
             */

            /* bb_dump_skip preceding text and up to the next % sign */
            for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);

            /* only text in the string */
            if (!*p1) {
                pr->fmt = fmtp;
                pr->flags = F_TEXT;
                break;
            }

            /*
             * get precision for %s -- if have a byte count, don't
             * need it.
             */
            if (fu->bcnt) {
                sokay = USEBCNT;
                /* bb_dump_skip to conversion character */
                for (++p1; strchr(index_str, *p1); ++p1);
            } else {
                /* bb_dump_skip any special chars, field width */
                while (strchr(index_str + 1, *++p1));
                if (*p1 == '.' && isdigit(*++p1)) {
                    sokay = USEPREC;
                    prec = atoi(p1);
                    while (isdigit(*++p1));
                } else
                    sokay = NOTOKAY;
            }

            p2 = p1 + 1;    /* set end pointer */

            /*
             * figure out the byte count for each conversion;
             * rewrite the format as necessary, set up blank-
             * pbb_dump_adding for end of data.
             */

            if (*p1 == 'c') {
                pr->flags = F_CHAR;
            DO_BYTE_COUNT_1:
                byte_count_str = "\001";
            DO_BYTE_COUNT:
                if (fu->bcnt) {
                    do {
                        if (fu->bcnt == *byte_count_str) {
                            break;
                        }
                    } while (*++byte_count_str);
                }
                /* Unlike the original, output the remainder of the format string. */
                if (!*byte_count_str) {
                    bb_error_msg_and_die("bad byte count for conversion character %s", p1);
                }
                pr->bcnt = *byte_count_str;
            } else if (*p1 == 'l') {
                ++p2;
                ++p1;
            DO_INT_CONV:
                {
                    const char *e;
                    if (!(e = strchr(lcc, *p1))) {
                        goto DO_BAD_CONV_CHAR;
                    }
                    pr->flags = F_INT;
                    if (e > lcc + 1) {
                        pr->flags = F_UINT;
                    }
                    byte_count_str = "\004\002\001";
                    goto DO_BYTE_COUNT;
                }
                /* NOTREACHED */
            } else if (strchr(lcc, *p1)) {
                goto DO_INT_CONV;
            } else if (strchr("eEfgG", *p1)) {
                pr->flags = F_DBL;
                byte_count_str = "\010\004";
                goto DO_BYTE_COUNT;
            } else if (*p1 == 's') {
                pr->flags = F_STR;
                if (sokay == USEBCNT) {
                    pr->bcnt = fu->bcnt;
                } else if (sokay == USEPREC) {
                    pr->bcnt = prec;
                } else {    /* NOTOKAY */
                    bb_error_msg_and_die("%%s requires a precision or a byte count");
                }
            } else if (*p1 == '_') {
                ++p2;
                switch (p1[1]) {
                case 'A':
                    endfu = fu;
                    fu->flags |= F_IGNORE;
                    /* FALLTHROUGH */
                case 'a':
                    pr->flags = F_ADDRESS;
                    ++p2;
                    if ((p1[2] != 'd') && (p1[2] != 'o') && (p1[2] != 'x')) {
                        goto DO_BAD_CONV_CHAR;
                    }
                    *p1 = p1[2];
                    break;
                case 'c':
                    pr->flags = F_C;
                    /* *p1 = 'c';   set in conv_c */
                    goto DO_BYTE_COUNT_1;
                case 'p':
                    pr->flags = F_P;
                    *p1 = 'c';
                    goto DO_BYTE_COUNT_1;
                case 'u':
                    pr->flags = F_U;
                    /* *p1 = 'c';   set in conv_u */
                    goto DO_BYTE_COUNT_1;
                default:
                    goto DO_BAD_CONV_CHAR;
                }
            } else {
            DO_BAD_CONV_CHAR:
                bb_error_msg_and_die("bad conversion character %%%s", p1);
            }

            /*
             * copy to PR format string, set conversion character
             * pointer, update original.
             */
            savech = *p2;
            p1[1] = '\0';
            pr->fmt = xstrdup(fmtp);
            *p2 = savech;
            pr->cchar = pr->fmt + (p1 - fmtp);

            /* DBU:[dave@cray.com] w/o this, trailing fmt text, space is lost.
             * Skip subsequent text and up to the next % sign and tack the
             * additional text onto fmt: eg. if fmt is "%x is a HEX number",
             * we lose the " is a HEX number" part of fmt.
             */
            for (p3 = p2; *p3 && *p3 != '%'; p3++);
            if (p3 > p2)
            {
                savech = *p3;
                *p3 = '\0';
                pr->fmt = xrealloc(pr->fmt, strlen(pr->fmt)+(p3-p2)+1);
                strcat(pr->fmt, p2);
                *p3 = savech;
                p2 = p3;
            }

            fmtp = p2;

            /* only one conversion character if byte count */
            if (!(pr->flags & F_ADDRESS) && fu->bcnt && nconv++) {
                bb_error_msg_and_die("byte count with multiple conversion characters");
            }
        }
        /*
         * if format unit byte count not specified, figure it out
         * so can adjust rep count later.
         */
        if (!fu->bcnt)
            for (pr = fu->nextpr; pr; pr = pr->nextpr)
                fu->bcnt += pr->bcnt;
    }
    /*
     * if the format string interprets any data at all, and it's
     * not the same as the bb_dump_blocksize, and its last format unit
     * interprets any data at all, and has no iteration count,
     * repeat it as necessary.
     *
     * if, rep count is greater than 1, no trailing whitespace
     * gets output from the last iteration of the format unit.
     */
    for (fu = fs->nextfu;; fu = fu->nextfu) {
        if (!fu->nextfu && fs->bcnt < bb_dump_blocksize &&
            !(fu->flags & F_SETREP) && fu->bcnt)
            fu->reps += (bb_dump_blocksize - fs->bcnt) / fu->bcnt;
        if (fu->reps > 1) {
            for (pr = fu->nextpr;; pr = pr->nextpr)
                if (!pr->nextpr)
                    break;
            for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
                p2 = isspace(*p1) ? p1 : NULL;
            if (p2)
                pr->nospace = p2;
        }
        if (!fu->nextfu)
            break;
    }
}

static void do_skip(const char *fname, int statok)
{
    struct stat sbuf;

    if (statok) {
        if (fstat(STDIN_FILENO, &sbuf)) {
            bb_perror_msg_and_die("%s", fname);
        }
        if ((!(S_ISCHR(sbuf.st_mode) ||
               S_ISBLK(sbuf.st_mode) ||
               S_ISFIFO(sbuf.st_mode))) && bb_dump_skip >= sbuf.st_size) {
            /* If bb_dump_size valid and bb_dump_skip >= size */
            bb_dump_skip -= sbuf.st_size;
            address += sbuf.st_size;
            return;
        }
    }
    if (fseek(stdin, bb_dump_skip, SEEK_SET)) {
        bb_perror_msg_and_die("%s", fname);
    }
    savaddress = address += bb_dump_skip;
    bb_dump_skip = 0;
}

static int next(char **argv)
{
    static smallint done;

    int statok;

    if (argv) {
        _argv = argv;
        return 1;
    }
    for (;;) {
        if (*_argv) {
            if (!(freopen(*_argv, "r", stdin))) {
                bb_perror_msg("%s", *_argv);
                exitval = 1;
                ++_argv;
                continue;
            }
            done = statok = 1;
        } else {
            if (done)
                return 0;
            done = 1;
            statok = 0;
        }
        if (bb_dump_skip)
            do_skip(statok ? *_argv : "stdin", statok);
        if (*_argv)
            ++_argv;
        if (!bb_dump_skip)
            return 1;
    }
    /* NOTREACHED */
}

static unsigned char *get(void)
{
    static smallint ateof = 1;
    static unsigned char *curp = NULL, *savp; /*DBU:[dave@cray.com]initialize curp */

    int n;
    int need, nread;
    unsigned char *tmpp;

    if (!curp) {
        address = (off_t)0; /*DBU:[dave@cray.com] initialize,initialize..*/
        curp = xmalloc(bb_dump_blocksize);
        savp = xmalloc(bb_dump_blocksize);
    } else {
        tmpp = curp;
        curp = savp;
        savp = tmpp;
        address = savaddress += bb_dump_blocksize;
    }
    for (need = bb_dump_blocksize, nread = 0;;) {
        /*
         * if read the right number of bytes, or at EOF for one file,
         * and no other files are available, zero-pad the rest of the
         * block and set the end flag.
         */
        if (!bb_dump_length || (ateof && !next((char **) NULL))) {
            if (need == bb_dump_blocksize) {
                return NULL;
            }
            if (bb_dump_vflag != ALL && !memcmp(curp, savp, nread)) {
                if (bb_dump_vflag != DUP) {
                    puts("*");
                }
                return NULL;
            }
            memset((char *) curp + nread, 0, need);
            eaddress = address + nread;
            return curp;
        }
        n = fread((char *) curp + nread, sizeof(unsigned char),
                  bb_dump_length == -1 ? need : MIN(bb_dump_length, need), stdin);
        if (!n) {
            if (ferror(stdin)) {
                bb_perror_msg("%s", _argv[-1]);
            }
            ateof = 1;
            continue;
        }
        ateof = 0;
        if (bb_dump_length != -1) {
            bb_dump_length -= n;
        }
        need -= n;
        if (!need) {
            if (bb_dump_vflag == ALL || bb_dump_vflag == FIRST
                || memcmp(curp, savp, bb_dump_blocksize)) {
                if (bb_dump_vflag == DUP || bb_dump_vflag == FIRST) {
                    bb_dump_vflag = WAIT;
                }
                return curp;
            }
            if (bb_dump_vflag == WAIT) {
                puts("*");
            }
            bb_dump_vflag = DUP;
            address = savaddress += bb_dump_blocksize;
            need = bb_dump_blocksize;
            nread = 0;
        } else {
            nread += n;
        }
    }
}

static void bpad(PR * pr)
{
    char *p1, *p2;

    /*
     * remove all conversion flags; '-' is the only one valid
     * with %s, and it's not useful here.
     */
    pr->flags = F_BPAD;
    *pr->cchar = 's';
    for (p1 = pr->fmt; *p1 != '%'; ++p1);
    for (p2 = ++p1; *p1 && strchr(" -0+#", *p1); ++p1)
        if (pr->nospace) pr->nospace--;
    while ((*p2++ = *p1++) != 0);
}

static const char conv_str[] ALIGN1 =
    "\0\\0\0"
    "\007\\a\0"             /* \a */
    "\b\\b\0"
    "\f\\b\0"
    "\n\\n\0"
    "\r\\r\0"
    "\t\\t\0"
    "\v\\v\0"
    ;


static void conv_c(PR * pr, unsigned char * p)
{
    const char *str = conv_str;
    char buf[10];

    do {
        if (*p == *str) {
            ++str;
            goto strpr;
        }
        str += 4;
    } while (*str);

    if (isprint(*p)) {
        *pr->cchar = 'c';
        (void) printf(pr->fmt, *p);
    } else {
        sprintf(buf, "%03o", (int) *p);
        str = buf;
      strpr:
        *pr->cchar = 's';
        printf(pr->fmt, str);
    }
}

static void conv_u(PR * pr, unsigned char * p)
{
    static const char list[] ALIGN1 =
        "nul\0soh\0stx\0etx\0eot\0enq\0ack\0bel\0"
        "bs\0_ht\0_lf\0_vt\0_ff\0_cr\0_so\0_si\0_"
        "dle\0dcl\0dc2\0dc3\0dc4\0nak\0syn\0etb\0"
        "can\0em\0_sub\0esc\0fs\0_gs\0_rs\0_us";

    /* od used nl, not lf */
    if (*p <= 0x1f) {
        *pr->cchar = 's';
        printf(pr->fmt, list + (4 * (int)*p));
    } else if (*p == 0x7f) {
        *pr->cchar = 's';
        printf(pr->fmt, "del");
    } else if (isprint(*p)) {
        *pr->cchar = 'c';
        printf(pr->fmt, *p);
    } else {
        *pr->cchar = 'x';
        printf(pr->fmt, (int) *p);
    }
}

static void display(void)
{
/*  extern FU *endfu; */
    FS *fs;
    FU *fu;
    PR *pr;
    int cnt;
    unsigned char *bp;

    off_t saveaddress;
    unsigned char savech = 0, *savebp;

    while ((bp = get()) != NULL) {
        for (fs = bb_dump_fshead, savebp = bp, saveaddress = address; fs;
             fs = fs->nextfs, bp = savebp, address = saveaddress) {
            for (fu = fs->nextfu; fu; fu = fu->nextfu) {
                if (fu->flags & F_IGNORE) {
                    break;
                }
                for (cnt = fu->reps; cnt; --cnt) {
                    for (pr = fu->nextpr; pr; address += pr->bcnt,
                         bp += pr->bcnt, pr = pr->nextpr) {
                        if (eaddress && address >= eaddress &&
                            !(pr->flags & (F_TEXT | F_BPAD))) {
                            bpad(pr);
                        }
                        if (cnt == 1 && pr->nospace) {
                            savech = *pr->nospace;
                            *pr->nospace = '\0';
                        }
/*                      PRINT; */
                        switch (pr->flags) {
                        case F_ADDRESS:
                            printf(pr->fmt, (unsigned int) address);
                            break;
                        case F_BPAD:
                            printf(pr->fmt, "");
                            break;
                        case F_C:
                            conv_c(pr, bp);
                            break;
                        case F_CHAR:
                            printf(pr->fmt, *bp);
                            break;
                        case F_DBL:{
                            double dval;
                            float fval;

                            switch (pr->bcnt) {
                            case 4:
                                memmove((char *) &fval, (char *) bp,
                                      sizeof(fval));
                                printf(pr->fmt, fval);
                                break;
                            case 8:
                                memmove((char *) &dval, (char *) bp,
                                      sizeof(dval));
                                printf(pr->fmt, dval);
                                break;
                            }
                            break;
                        }
                        case F_INT:{
                            int ival;
                            short sval;

                            switch (pr->bcnt) {
                            case 1:
                                printf(pr->fmt, (int) *bp);
                                break;
                            case 2:
                                memmove((char *) &sval, (char *) bp,
                                      sizeof(sval));
                                printf(pr->fmt, (int) sval);
                                break;
                            case 4:
                                memmove((char *) &ival, (char *) bp,
                                      sizeof(ival));
                                printf(pr->fmt, ival);
                                break;
                            }
                            break;
                        }
                        case F_P:
                            printf(pr->fmt, isprint(*bp) ? *bp : '.');
                            break;
                        case F_STR:
                            printf(pr->fmt, (char *) bp);
                            break;
                        case F_TEXT:
                            printf(pr->fmt);
                            break;
                        case F_U:
                            conv_u(pr, bp);
                            break;
                        case F_UINT:{
                            unsigned int ival;
                            unsigned short sval;

                            switch (pr->bcnt) {
                            case 1:
                                printf(pr->fmt, (unsigned int) * bp);
                                break;
                            case 2:
                                memmove((char *) &sval, (char *) bp,
                                      sizeof(sval));
                                printf(pr->fmt, (unsigned int) sval);
                                break;
                            case 4:
                                memmove((char *) &ival, (char *) bp,
                                      sizeof(ival));
                                printf(pr->fmt, ival);
                                break;
                            }
                            break;
                        }
                        }
                        if (cnt == 1 && pr->nospace) {
                            *pr->nospace = savech;
                        }
                    }
                }
            }
        }
    }
    if (endfu) {
        /*
         * if eaddress not set, error or file bb_dump_size was multiple of
         * bb_dump_blocksize, and no partial block ever found.
         */
        if (!eaddress) {
            if (!address) {
                return;
            }
            eaddress = address;
        }
        for (pr = endfu->nextpr; pr; pr = pr->nextpr) {
            switch (pr->flags) {
            case F_ADDRESS:
                (void) printf(pr->fmt, (unsigned int) eaddress);
                break;
            case F_TEXT:
                (void) printf(pr->fmt);
                break;
            }
        }
    }
}

int bb_dump_dump(char **argv)
{
    FS *tfs;

    /* figure out the data block bb_dump_size */
    for (bb_dump_blocksize = 0, tfs = bb_dump_fshead; tfs; tfs = tfs->nextfs) {
        tfs->bcnt = bb_dump_size(tfs);
        if (bb_dump_blocksize < tfs->bcnt) {
            bb_dump_blocksize = tfs->bcnt;
        }
    }
    /* rewrite the rules, do syntax checking */
    for (tfs = bb_dump_fshead; tfs; tfs = tfs->nextfs) {
        rewrite(tfs);
    }

    next(argv);
    display();

    return exitval;
}

void bb_dump_add(const char *fmt)
{
    const char *p;
    char *p1;
    char *p2;
    static FS **nextfs;
    FS *tfs;
    FU *tfu, **nextfu;
    const char *savep;

    /* start new linked list of format units */
    tfs = xzalloc(sizeof(FS)); /*DBU:[dave@cray.com] start out NULL */
    if (!bb_dump_fshead) {
        bb_dump_fshead = tfs;
    } else {
        *nextfs = tfs;
    }
    nextfs = &tfs->nextfs;
    nextfu = &tfs->nextfu;

    /* take the format string and break it up into format units */
    for (p = fmt;;) {
        /* bb_dump_skip leading white space */
        p = skip_whitespace(p);
        if (!*p) {
            break;
        }

        /* allocate a new format unit and link it in */
        /* NOSTRICT */
        /* DBU:[dave@cray.com] calloc so that forward pointers start out NULL */
        tfu = xzalloc(sizeof(FU));
        *nextfu = tfu;
        nextfu = &tfu->nextfu;
        tfu->reps = 1;

        /* if leading digit, repetition count */
        if (isdigit(*p)) {
            for (savep = p; isdigit(*p); ++p);
            if (!isspace(*p) && *p != '/') {
                bb_error_msg_and_die("bad format {%s}", fmt);
            }
            /* may overwrite either white space or slash */
            tfu->reps = atoi(savep);
            tfu->flags = F_SETREP;
            /* bb_dump_skip trailing white space */
            p = skip_whitespace(++p);
        }

        /* bb_dump_skip slash and trailing white space */
        if (*p == '/') {
            p = skip_whitespace(++p);
        }

        /* byte count */
        if (isdigit(*p)) {
// TODO: use bb_strtou
            savep = p;
            do p++; while (isdigit(*p));
            if (!isspace(*p)) {
                bb_error_msg_and_die("bad format {%s}", fmt);
            }
            tfu->bcnt = atoi(savep);
            /* bb_dump_skip trailing white space */
            p = skip_whitespace(++p);
        }

        /* format */
        if (*p != '"') {
            bb_error_msg_and_die("bad format {%s}", fmt);
        }
        for (savep = ++p; *p != '"';) {
            if (*p++ == 0) {
                bb_error_msg_and_die("bad format {%s}", fmt);
            }
        }
        tfu->fmt = xmalloc(p - savep + 1);
        strncpy(tfu->fmt, savep, p - savep);
        tfu->fmt[p - savep] = '\0';
/*      escape(tfu->fmt); */

        p1 = tfu->fmt;

        /* alphabetic escape sequences have to be done in place */
        for (p2 = p1;; ++p1, ++p2) {
            if (!*p1) {
                *p2 = *p1;
                break;
            }
            if (*p1 == '\\') {
                const char *cs = conv_str + 4;
                ++p1;
                *p2 = *p1;
                do {
                    if (*p1 == cs[2]) {
                        *p2 = cs[0];
                        break;
                    }
                    cs += 4;
                } while (*cs);
            }
        }

        p++;
    }
}

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */