Logo Search packages:      
Sourcecode: tcsh version File versions  Download package

sh.dol.c

/* $Header: /p/tcsh/cvsroot/tcsh/sh.dol.c,v 3.77 2009/06/19 16:25:00 christos Exp $ */
/*
 * sh.dol.c: Variable substitutions
 */
/*-
 * Copyright (c) 1980, 1991 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
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * 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.
 */
#include "sh.h"

RCSID("$tcsh: sh.dol.c,v 3.77 2009/06/19 16:25:00 christos Exp $")

/*
 * C shell
 */

/*
 * These routines perform variable substitution and quoting via ' and ".
 * To this point these constructs have been preserved in the divided
 * input words.  Here we expand variables and turn quoting via ' and " into
 * QUOTE bits on characters (which prevent further interpretation).
 * If the `:q' modifier was applied during history expansion, then
 * some QUOTEing may have occurred already, so we dont "trim()" here.
 */

static Char Dpeekc;           /* Peek for DgetC */
static eChar Dpeekrd;         /* Peek for Dreadc */
static Char *Dcp, *const *Dvp;      /* Input vector for Dreadc */

#define     DEOF  CHAR_ERR

#define     unDgetC(c)  Dpeekc = c

#define QUOTES          (_QF|_QB|_ESC)    /* \ ' " ` */

/*
 * The following variables give the information about the current
 * $ expansion, recording the current word position, the remaining
 * words within this expansion, the count of remaining words, and the
 * information about any : modifier which is being applied.
 */
static Char *dolp;            /* Remaining chars from this word */
static Char **dolnxt;         /* Further words */
static int dolcnt;            /* Count of further words */
static struct Strbuf dolmod; /* = Strbuf_INIT; : modifier characters */
static int dolmcnt;           /* :gx -> INT_MAX, else 1 */
static int dol_flag_a;        /* :ax -> 1, else 0 */

static      Char   **Dfix2    (Char *const *);
static      int    Dpack            (struct Strbuf *);
static      int    Dword            (struct blk_buf *);
static      void   dolerror   (Char *);
static      eChar  DgetC            (int);
static      void   Dgetdol    (void);
static      void   fixDolMod  (void);
static      void   setDolp    (Char *);
static      void   unDredc    (eChar);
static      eChar  Dredc            (void);
static      void   Dtestq           (Char);

/*
 * Fix up the $ expansions and quotations in the
 * argument list to command t.
 */
void
Dfix(struct command *t)
{
    Char **pp;
    Char *p;

    if (noexec)
      return;
    /* Note that t_dcom isn't trimmed thus !...:q's aren't lost */
    for (pp = t->t_dcom; (p = *pp++) != NULL;) {
      for (; *p; p++) {
          if (cmap(*p, _DOL | QUOTES)) {  /* $, \, ', ", ` */
            Char **expanded;

            expanded = Dfix2(t->t_dcom);  /* found one */
            blkfree(t->t_dcom);
            t->t_dcom = expanded;
            return;
          }
      }
    }
}

/*
 * $ substitute one word, for i/o redirection
 */
Char   *
Dfix1(Char *cp)
{
    Char *Dv[2], **expanded;

    if (noexec)
      return (0);
    Dv[0] = cp;
    Dv[1] = NULL;
    expanded = Dfix2(Dv);
    if (expanded[0] == NULL || expanded[1] != NULL) {
      blkfree(expanded);
      setname(short2str(cp));
      stderror(ERR_NAME | ERR_AMBIG);
    }
    cp = Strsave(expanded[0]);
    blkfree(expanded);
    return (cp);
}

/*
 * Subroutine to do actual fixing after state initialization.
 */
static Char **
Dfix2(Char *const *v)
{
    struct blk_buf *bb = bb_alloc();
    Char **vec;

    Dvp = v;
    Dcp = STRNULL;            /* Setup input vector for Dreadc */
    unDgetC(0);
    unDredc(0);               /* Clear out any old peeks (at error) */
    dolp = 0;
    dolcnt = 0;               /* Clear out residual $ expands (...) */
    cleanup_push(bb, bb_free);
    while (Dword(bb))
      continue;
    cleanup_ignore(bb);
    cleanup_until(bb);
    vec = bb_finish(bb);
    xfree(bb);
    return vec;
}

/*
 * Pack up more characters in this word
 */
static int
Dpack(struct Strbuf *wbuf)
{
    eChar c;

    for (;;) {
      c = DgetC(DODOL);
      if (c == '\\') {
          c = DgetC(0);
          if (c == DEOF) {
            unDredc(c);
            return 1;
          }
          if (c == '\n')
            c = ' ';
          else
            c |= QUOTE;
      }
      if (c == DEOF) {
          unDredc(c);
          return 1;
      }
      if (cmap(c, _SP | _NL | _QF | _QB)) {     /* sp \t\n'"` */
          unDgetC(c);
          if (cmap(c, QUOTES))
            return 0;
          return 1;
      }
      Strbuf_append1(wbuf, (Char) c);
    }
}

/*
 * Get a word.  This routine is analogous to the routine
 * word() in sh.lex.c for the main lexical input.  One difference
 * here is that we don't get a newline to terminate our expansion.
 * Rather, DgetC will return a DEOF when we hit the end-of-input.
 */
static int
Dword(struct blk_buf *bb)
{
    eChar c, c1;
    struct Strbuf *wbuf = Strbuf_alloc();
    int dolflg;
    int    sofar = 0;
    Char *str;

    cleanup_push(wbuf, Strbuf_free);
    for (;;) {
      c = DgetC(DODOL);
      switch (c) {

      case DEOF:
          if (sofar == 0) {
            cleanup_until(wbuf);
            return (0);
          }
          /* finish this word and catch the code above the next time */
          unDredc(c);
          /*FALLTHROUGH*/

      case '\n':
          goto end;

      case ' ':
      case '\t':
          continue;

      case '`':
          /* We preserve ` quotations which are done yet later */
          Strbuf_append1(wbuf, (Char) c);
          /*FALLTHROUGH*/
      case '\'':
      case '"':
          /*
           * Note that DgetC never returns a QUOTES character from an
           * expansion, so only true input quotes will get us here or out.
           */
          c1 = c;
          dolflg = c1 == '"' ? DODOL : 0;
          for (;;) {
            c = DgetC(dolflg);
            if (c == c1)
                break;
            if (c == '\n' || c == DEOF) {
                cleanup_until(bb);
                stderror(ERR_UNMATCHED, (int)c1);
            }
            if ((c & (QUOTE | TRIM)) == ('\n' | QUOTE)) {
                if (wbuf->len != 0 && (wbuf->s[wbuf->len - 1] & TRIM) == '\\')
                  wbuf->len--;
            }
            switch (c1) {

            case '"':
                /*
                 * Leave any `s alone for later. Other chars are all
                 * quoted, thus `...` can tell it was within "...".
                 */
                Strbuf_append1(wbuf, c == '`' ? '`' : c | QUOTE);
                break;

            case '\'':
                /* Prevent all further interpretation */
                Strbuf_append1(wbuf, c | QUOTE);
                break;

            case '`':
                /* Leave all text alone for later */
                Strbuf_append1(wbuf, (Char) c);
                break;

            default:
                break;
            }
          }
          if (c1 == '`')
            Strbuf_append1(wbuf, '`');
          sofar = 1;
          if (Dpack(wbuf) != 0)
            goto end;
          continue;

      case '\\':
          c = DgetC(0); /* No $ subst! */
          if (c == '\n' || c == DEOF)
            continue;
          c |= QUOTE;
          break;

      default:
          break;
      }
      unDgetC(c);
      sofar = 1;
      if (Dpack(wbuf) != 0)
          goto end;
    }

 end:
    cleanup_ignore(wbuf);
    cleanup_until(wbuf);
    str = Strbuf_finish(wbuf);
    bb_append(bb, str);
    xfree(wbuf);
    return 1;
}


/*
 * Get a character, performing $ substitution unless flag is 0.
 * Any QUOTES character which is returned from a $ expansion is
 * QUOTEd so that it will not be recognized above.
 */
static eChar
DgetC(int flag)
{
    Char c;

top:
    if ((c = Dpeekc) != 0) {
      Dpeekc = 0;
      return (c);
    }
    if (lap < labuf.len) {
      c = labuf.s[lap++] & (QUOTE | TRIM);
quotspec:
      if (cmap(c, QUOTES))
          return (c | QUOTE);
      return (c);
    }
    if (dolp) {
      if ((c = *dolp++ & (QUOTE | TRIM)) != 0)
          goto quotspec;
      if (dolcnt > 0) {
          setDolp(*dolnxt++);
          --dolcnt;
          return (' ');
      }
      dolp = 0;
    }
    if (dolcnt > 0) {
      setDolp(*dolnxt++);
      --dolcnt;
      goto top;
    }
    c = Dredc();
    if (c == '$' && flag) {
      Dgetdol();
      goto top;
    }
    return (c);
}

static Char *nulvec[] = { NULL };
static struct varent nulargv = {nulvec, STRargv, VAR_READWRITE, 
                        { NULL, NULL, NULL }, 0 };

static void
dolerror(Char *s)
{
    setname(short2str(s));
    stderror(ERR_NAME | ERR_RANGE);
}

/*
 * Handle the multitudinous $ expansion forms.
 * Ugh.
 */
static void
Dgetdol(void)
{
    Char *np;
    struct varent *vp = NULL;
    struct Strbuf *name = Strbuf_alloc();
    eChar   c, sc;
    int     subscr = 0, lwb = 1, upb = 0;
    int    dimen = 0, bitset = 0, length = 0;
    static Char *dolbang = NULL;

    cleanup_push(name, Strbuf_free);
    dolmod.len = dolmcnt = dol_flag_a = 0;
    c = sc = DgetC(0);
    if (c == DEOF) {
      stderror(ERR_SYNTAX);
      return;
    }
    if (c == '{')
      c = DgetC(0);           /* sc is { to take } later */
    if ((c & TRIM) == '#')
      dimen++, c = DgetC(0);  /* $# takes dimension */
    else if (c == '?')
      bitset++, c = DgetC(0); /* $? tests existence */
    else if (c == '%')
      length++, c = DgetC(0); /* $% returns length in chars */
    switch (c) {

    case '!':
      if (dimen || bitset || length)
          stderror(ERR_SYNTAX);
      if (backpid != 0) {
          xfree(dolbang);
          setDolp(dolbang = putn(backpid));
      }
      cleanup_until(name);
      goto eatbrac;

    case '$':
      if (dimen || bitset || length)
          stderror(ERR_SYNTAX);
      setDolp(doldol);
      cleanup_until(name);
      goto eatbrac;

    case '<'|QUOTE: {
      static struct Strbuf wbuf; /* = Strbuf_INIT; */

      if (bitset)
          stderror(ERR_NOTALLOWED, "$?<");
      if (dimen)
          stderror(ERR_NOTALLOWED, "$#<");
      if (length)
          stderror(ERR_NOTALLOWED, "$%<");
      wbuf.len = 0;
      {
          char cbuf[MB_LEN_MAX];
          size_t cbp = 0;
          int old_pintr_disabled;

          for (;;) {
              int len;
            ssize_t res;
            Char wc;

            pintr_push_enable(&old_pintr_disabled);
            res = force_read(OLDSTD, cbuf + cbp, 1);
            cleanup_until(&old_pintr_disabled);
            if (res != 1)
                break;
            cbp++;
            len = normal_mbtowc(&wc, cbuf, cbp);
            if (len == -1) {
                reset_mbtowc();
                if (cbp < MB_LEN_MAX)
                    continue; /* Maybe a partial character */
                wc = (unsigned char)*cbuf | INVALID_BYTE;
            }
            if (len <= 0)
                len = 1;
            if (cbp != (size_t)len)
                memmove(cbuf, cbuf + len, cbp - len);
            cbp -= len;
            if (wc == '\n')
                break;
            Strbuf_append1(&wbuf, wc);
          }
          while (cbp != 0) {
            int len;
            Char wc;

            len = normal_mbtowc(&wc, cbuf, cbp);
            if (len == -1) {
                reset_mbtowc();
                wc = (unsigned char)*cbuf | INVALID_BYTE;
            }
            if (len <= 0)
                len = 1;
            if (cbp != (size_t)len)
                memmove(cbuf, cbuf + len, cbp - len);
            cbp -= len;
            if (wc == '\n')
                break;
            Strbuf_append1(&wbuf, wc);
          }
          Strbuf_terminate(&wbuf);
      }

      fixDolMod();
      setDolp(wbuf.s); /* Kept allocated until next $< expansion */
      cleanup_until(name);
      goto eatbrac;
    }

    case '*':
      Strbuf_append(name, STRargv);
      Strbuf_terminate(name);
      vp = adrof(STRargv);
      subscr = -1;            /* Prevent eating [...] */
      break;

    case DEOF:
    case '\n':
      np = dimen ? STRargv : (bitset ? STRstatus : NULL);
      if (np) {
          bitset = 0;
          Strbuf_append(name, np);
          Strbuf_terminate(name);
          vp = adrof(np);
          subscr = -1;        /* Prevent eating [...] */
          unDredc(c);
          break;
      }
      else
          stderror(ERR_SYNTAX);
      /*NOTREACHED*/

    default:
      if (Isdigit(c)) {
          if (dimen)
            stderror(ERR_NOTALLOWED, "$#<num>");
          subscr = 0;
          do {
            subscr = subscr * 10 + c - '0';
            c = DgetC(0);
          } while (c != DEOF && Isdigit(c));
          unDredc(c);
          if (subscr < 0)
            stderror(ERR_RANGE);
          if (subscr == 0) {
            if (bitset) {
                dolp = dolzero ? STR1 : STR0;
                cleanup_until(name);
                goto eatbrac;
            }
            if (ffile == 0)
                stderror(ERR_DOLZERO);
            if (length) {
                length = Strlen(ffile);
                addla(putn(length));
            }
            else {
                fixDolMod();
                setDolp(ffile);
            }
            cleanup_until(name);
            goto eatbrac;
          }
#if 0
          if (bitset)
            stderror(ERR_NOTALLOWED, "$?<num>");
          if (length)
            stderror(ERR_NOTALLOWED, "$%<num>");
#endif
          vp = adrof(STRargv);
          if (vp == 0) {
            vp = &nulargv;
            cleanup_until(name);
            goto eatmod;
          }
          break;
      }
      if (c == DEOF || !alnum(c)) {
          np = dimen ? STRargv : (bitset ? STRstatus : NULL);
          if (np) {
            bitset = 0;
            Strbuf_append(name, np);
            Strbuf_terminate(name);
            vp = adrof(np);
            subscr = -1;            /* Prevent eating [...] */
            unDredc(c);
            break;
          }
          else
            stderror(ERR_VARALNUM);
      }
      for (;;) {
          Strbuf_append1(name, (Char) c);
          c = DgetC(0);
          if (c == DEOF || !alnum(c))
            break;
      }
      Strbuf_terminate(name);
      unDredc(c);
      vp = adrof(name->s);
    }
    if (bitset) {
      dolp = (vp || getenv(short2str(name->s))) ? STR1 : STR0;
      cleanup_until(name);
      goto eatbrac;
    }
    if (vp == NULL || vp->vec == NULL) {
      np = str2short(getenv(short2str(name->s)));
      if (np) {
          static Char *env_val; /* = NULL; */

          cleanup_until(name);
          fixDolMod();
          if (length) {
                addla(putn(Strlen(np)));
          } else {
                xfree(env_val);
                env_val = Strsave(np);
                setDolp(env_val);
          }
          goto eatbrac;
      }
      udvar(name->s);
      /* NOTREACHED */
    }
    cleanup_until(name);
    c = DgetC(0);
    upb = blklen(vp->vec);
    if (dimen == 0 && subscr == 0 && c == '[') {
      name = Strbuf_alloc();
      cleanup_push(name, Strbuf_free);
      np = name->s;
      for (;;) {
          c = DgetC(DODOL);   /* Allow $ expand within [ ] */
          if (c == ']')
            break;
          if (c == '\n' || c == DEOF)
            stderror(ERR_INCBR);
          Strbuf_append1(name, (Char) c);
      }
      Strbuf_terminate(name);
      np = name->s;
      if (dolp || dolcnt)     /* $ exp must end before ] */
          stderror(ERR_EXPORD);
      if (!*np)
          stderror(ERR_SYNTAX);
      if (Isdigit(*np)) {
          int     i;

          for (i = 0; Isdigit(*np); i = i * 10 + *np++ - '0')
            continue;
          if (i < 0 || i > upb && !any("-*", *np)) {
            cleanup_until(name);
            dolerror(vp->v_name);
            return;
          }
          lwb = i;
          if (!*np)
            upb = lwb, np = STRstar;
      }
      if (*np == '*')
          np++;
      else if (*np != '-')
          stderror(ERR_MISSING, '-');
      else {
          int i = upb;

          np++;
          if (Isdigit(*np)) {
            i = 0;
            while (Isdigit(*np))
                i = i * 10 + *np++ - '0';
            if (i < 0 || i > upb) {
                cleanup_until(name);
                dolerror(vp->v_name);
                return;
            }
          }
          if (i < lwb)
            upb = lwb - 1;
          else
            upb = i;
      }
      if (lwb == 0) {
          if (upb != 0) {
            cleanup_until(name);
            dolerror(vp->v_name);
            return;
          }
          upb = -1;
      }
      if (*np)
          stderror(ERR_SYNTAX);
      cleanup_until(name);
    }
    else {
      if (subscr > 0) {
          if (subscr > upb)
            lwb = 1, upb = 0;
          else
            lwb = upb = subscr;
      }
      unDredc(c);
    }
    if (dimen) {
      /* this is a kludge. It prevents Dgetdol() from */
      /* pushing erroneous ${#<error> values into the labuf. */
      if (sc == '{') {
          c = Dredc();
          if (c != '}')
            stderror(ERR_MISSING, '}');
          unDredc(c);
      }
      addla(putn(upb - lwb + 1));
    }
    else if (length) {
      int i;

      for (i = lwb - 1, length = 0; i < upb; i++)
          length += Strlen(vp->vec[i]);
#ifdef notdef
      /* We don't want that, since we can always compute it by adding $#xxx */
      length += i - 1;  /* Add the number of spaces in */
#endif
      addla(putn(length));
    }
    else {
eatmod:
      fixDolMod();
      dolnxt = &vp->vec[lwb - 1];
      dolcnt = upb - lwb + 1;
    }
eatbrac:
    if (sc == '{') {
      c = Dredc();
      if (c != '}')
          stderror(ERR_MISSING, '}');
    }
}

static void
fixDolMod(void)
{
    eChar c;

    c = DgetC(0);
    if (c == ':') {
      do {
          c = DgetC(0), dolmcnt = 1, dol_flag_a = 0;
          if (c == 'g' || c == 'a') {
            if (c == 'g')
                dolmcnt = INT_MAX;
            else
                dol_flag_a = 1;
            c = DgetC(0);
          }
          if ((c == 'g' && dolmcnt != INT_MAX) || 
            (c == 'a' && dol_flag_a == 0)) {
            if (c == 'g')
                dolmcnt = INT_MAX;
            else
                dol_flag_a = 1;
            c = DgetC(0);
          }

          if (c == 's') {     /* [eichin:19910926.0755EST] */
            int delimcnt = 2;
            eChar delim = DgetC(0);
            Strbuf_append1(&dolmod, (Char) c);
            Strbuf_append1(&dolmod, (Char) delim);

            if (delim == DEOF || !delim || letter(delim)
                || Isdigit(delim) || any(" \t\n", delim)) {
                seterror(ERR_BADSUBST);
                break;
            }     
            while ((c = DgetC(0)) != DEOF) {
                Strbuf_append1(&dolmod, (Char) c);
                if(c == delim) delimcnt--;
                if(!delimcnt) break;
            }
            if(delimcnt) {
                seterror(ERR_BADSUBST);
                break;
            }
            continue;
          }
          if (!any("luhtrqxes", c))
            stderror(ERR_BADMOD, (int)c);
          Strbuf_append1(&dolmod, (Char) c);
          if (c == 'q')
            dolmcnt = INT_MAX;
      }
      while ((c = DgetC(0)) == ':');
      unDredc(c);
    }
    else
      unDredc(c);
}

static void
setDolp(Char *cp)
{
    Char *dp;
    size_t i;

    if (dolmod.len == 0 || dolmcnt == 0) {
      dolp = cp;
      return;
    }
    cp = Strsave(cp);
    for (i = 0; i < dolmod.len; i++) {
      int didmod = 0;

      /* handle s// [eichin:19910926.0510EST] */
      if(dolmod.s[i] == 's') {
          Char delim;
          Char *lhsub, *rhsub, *np;
          size_t lhlen = 0, rhlen = 0;

          delim = dolmod.s[++i];
          if (!delim || letter(delim)
            || Isdigit(delim) || any(" \t\n", delim)) {
            seterror(ERR_BADSUBST);
            break;
          }
          lhsub = &dolmod.s[++i];
          while(dolmod.s[i] != delim && dolmod.s[++i]) {
            lhlen++;
          }
          dolmod.s[i] = 0;
          rhsub = &dolmod.s[++i];
          while(dolmod.s[i] != delim && dolmod.s[++i]) {
            rhlen++;
          }
          dolmod.s[i] = 0;

          strip(lhsub);
          strip(rhsub);
          strip(cp);
          dp = cp;
          do {
            dp = Strstr(dp, lhsub);
            if (dp) {
                ptrdiff_t diff = dp - cp;
                size_t len = (Strlen(cp) + 1 - lhlen + rhlen);
                np = xmalloc(len * sizeof(Char));
                (void) Strncpy(np, cp, diff);
                (void) Strcpy(np + diff, rhsub);
                (void) Strcpy(np + diff + rhlen, dp + lhlen);

                dp = np + diff + 1;
                xfree(cp);
                cp = np;
                cp[--len] = '\0';
                didmod = 1;
                if (diff >= len)
                  break;
            } else {
                /* should this do a seterror? */
                break;
            }
          }
          while (dol_flag_a != 0);
          /*
           * restore dolmod for additional words
           */
          dolmod.s[i] = rhsub[-1] = (Char) delim;
        } else {

          do {
            if ((dp = domod(cp, dolmod.s[i])) != NULL) {
                didmod = 1;
                if (Strcmp(cp, dp) == 0) {
                  xfree(cp);
                  cp = dp;
                  break;
                }
                else {
                  xfree(cp);
                  cp = dp;
                }
            }
            else
                break;
          }
          while (dol_flag_a != 0);
      }
      if (didmod && dolmcnt != INT_MAX)
          dolmcnt--;
#ifdef notdef
      else
          break;
#endif
    }

    addla(cp);

    dolp = STRNULL;
    if (seterr)
      stderror(ERR_OLD);
}

static void
unDredc(eChar c)
{

    Dpeekrd = c;
}

static eChar
Dredc(void)
{
    Char c;

    if ((c = Dpeekrd) != 0) {
      Dpeekrd = 0;
      return (c);
    }
    if (Dcp && (c = *Dcp++))
      return (c & (QUOTE | TRIM));
    if (*Dvp == 0) {
      Dcp = 0;
      return (DEOF);
    }
    Dcp = *Dvp++;
    return (' ');
}

static int gflag;

static void
Dtestq(Char c)
{

    if (cmap(c, QUOTES))
      gflag = 1;
}

static void
inheredoc_cleanup(void *dummy)
{
    USE(dummy);
    inheredoc = 0;
}

/*
 * Form a shell temporary file (in unit 0) from the words
 * of the shell input up to EOF or a line the same as "term".
 * Unit 0 should have been closed before this call.
 */
void
heredoc(Char *term)
{
    eChar  c;
    Char   *Dv[2];
    struct Strbuf lbuf = Strbuf_INIT, mbuf = Strbuf_INIT;
    Char    obuf[BUFSIZE + 1];
#define OBUF_END (obuf + sizeof(obuf) / sizeof (*obuf) - 1)
    Char *lbp, *obp, *mbp;
    Char  **vp;
    int    quoted;
    char   *tmp;
#ifndef WINNT_NATIVE
    struct timeval tv;

again:
#endif /* WINNT_NATIVE */
    tmp = short2str(shtemp);
#ifndef O_CREAT
# define O_CREAT 0
    if (xcreat(tmp, 0600) < 0)
      stderror(ERR_SYSTEM, tmp, strerror(errno));
#endif
    xclose(0);
#ifndef O_TEMPORARY
# define O_TEMPORARY 0
#endif
#ifndef O_EXCL
# define O_EXCL 0
#endif
    if (xopen(tmp, O_RDWR|O_CREAT|O_EXCL|O_TEMPORARY|O_LARGEFILE, 0600) ==
      -1) {
      int oerrno = errno;
#ifndef WINNT_NATIVE
      if (errno == EEXIST) {
          if (unlink(tmp) == -1) {
            (void) gettimeofday(&tv, NULL);
            xfree(shtemp);
            mbp = putn((((int)tv.tv_sec) ^ 
                ((int)tv.tv_usec) ^ ((int)getpid())) & 0x00ffffff);
            shtemp = Strspl(STRtmpsh, mbp);
            xfree(mbp);
          }
          goto again;
      }
#endif /* WINNT_NATIVE */
      (void) unlink(tmp);
      errno = oerrno;
      stderror(ERR_SYSTEM, tmp, strerror(errno));
    }
    (void) unlink(tmp);       /* 0 0 inode! */
    Dv[0] = term;
    Dv[1] = NULL;
    gflag = 0;
    trim(Dv);
    rscan(Dv, Dtestq);
    quoted = gflag;
    obp = obuf;
    obuf[BUFSIZE] = 0;
    inheredoc = 1;
    cleanup_push(&inheredoc, inheredoc_cleanup);
#ifdef WINNT_NATIVE
    __dup_stdin = 1;
#endif /* WINNT_NATIVE */
    cleanup_push(&lbuf, Strbuf_cleanup);
    cleanup_push(&mbuf, Strbuf_cleanup);
    for (;;) {
      Char **words;

      /*
       * Read up a line
       */
      lbuf.len = 0;
      for (;;) {
          c = readc(1); /* 1 -> Want EOF returns */
          if (c == CHAR_ERR || c == '\n')
            break;
          if ((c &= TRIM) != 0)
            Strbuf_append1(&lbuf, (Char) c);
      }
      Strbuf_terminate(&lbuf);

      /*
       * Check for EOF or compare to terminator -- before expansion
       */
      if (c == CHAR_ERR || eq(lbuf.s, term))
          break;

      /*
       * If term was quoted or -n just pass it on
       */
      if (quoted || noexec) {
          Strbuf_append1(&lbuf, '\n');
          Strbuf_terminate(&lbuf);
          for (lbp = lbuf.s; (c = *lbp++) != 0;) {
            *obp++ = (Char) c;
            if (obp == OBUF_END) {
                tmp = short2str(obuf);
                (void) xwrite(0, tmp, strlen (tmp));
                obp = obuf;
            }
          }
          continue;
      }

      /*
       * Term wasn't quoted so variable and then command expand the input
       * line
       */
      Dcp = lbuf.s;
      Dvp = Dv + 1;
      mbuf.len = 0;
      for (;;) {
          c = DgetC(DODOL);
          if (c == DEOF)
            break;
          if ((c &= TRIM) == 0)
            continue;
          /* \ quotes \ $ ` here */
          if (c == '\\') {
            c = DgetC(0);
            if (!any("$\\`", c))
                unDgetC(c | QUOTE), c = '\\';
            else
                c |= QUOTE;
          }
          Strbuf_append1(&mbuf, (Char) c);
      }
      Strbuf_terminate(&mbuf);

      /*
       * If any ` in line do command substitution
       */
      mbp = mbuf.s;
      if (Strchr(mbp, '`') != NULL) {
          /*
           * 1 arg to dobackp causes substitution to be literal. Words are
           * broken only at newlines so that all blanks and tabs are
           * preserved.  Blank lines (null words) are not discarded.
           */
          words = dobackp(mbp, 1);
      }
      else
          /* Setup trivial vector similar to return of dobackp */
          Dv[0] = mbp, Dv[1] = NULL, words = Dv;

      /*
       * Resurrect the words from the command substitution each separated by
       * a newline.  Note that the last newline of a command substitution
       * will have been discarded, but we put a newline after the last word
       * because this represents the newline after the last input line!
       */
      for (vp= words; *vp; vp++) {
          for (mbp = *vp; *mbp; mbp++) {
            *obp++ = *mbp & TRIM;
            if (obp == OBUF_END) {
                tmp = short2str(obuf);
                (void) xwrite(0, tmp, strlen (tmp));
                obp = obuf;
            }
          }
          *obp++ = '\n';
          if (obp == OBUF_END) {
              tmp = short2str(obuf);
            (void) xwrite(0, tmp, strlen (tmp));
            obp = obuf;
          }
      }
      if (words != Dv)
          blkfree(words);
    }
    *obp = 0;
    tmp = short2str(obuf);
    (void) xwrite(0, tmp, strlen (tmp));
    (void) lseek(0, (off_t) 0, L_SET);
    cleanup_until(&inheredoc);
}

Generated by  Doxygen 1.6.0   Back to index