| /*- |
| * Copyright (c) 1991, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * Copyright (c) 1997-2005 |
| * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Kenneth Almquist. |
| * |
| * 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. |
| */ |
| |
| #if HAVE_ALLOCA_H |
| #include <alloca.h> |
| #endif |
| |
| #include <stdlib.h> |
| |
| #include "shell.h" |
| #include "parser.h" |
| #include "nodes.h" |
| #include "expand.h" /* defines rmescapes() */ |
| #include "exec.h" /* defines find_builtin() */ |
| #include "syntax.h" |
| #include "options.h" |
| #include "input.h" |
| #include "output.h" |
| #include "var.h" |
| #include "error.h" |
| #include "memalloc.h" |
| #include "mystring.h" |
| #include "alias.h" |
| #include "show.h" |
| #include "builtins.h" |
| #include "system.h" |
| #ifndef SMALL |
| #include "myhistedit.h" |
| #endif |
| |
| /* |
| * Shell command parser. |
| */ |
| |
| /* values returned by readtoken */ |
| #include "token_vars.h" |
| |
| |
| |
| /* Used by expandstr to get here-doc like behaviour. */ |
| #define FAKEEOFMARK (char *)1 |
| |
| |
| |
| struct heredoc { |
| struct heredoc *next; /* next here document in list */ |
| union node *here; /* redirection node */ |
| char *eofmark; /* string indicating end of input */ |
| int striptabs; /* if set, strip leading tabs */ |
| }; |
| |
| |
| |
| struct heredoc *heredoclist; /* list of here documents to read */ |
| int doprompt; /* if set, prompt the user */ |
| int needprompt; /* true if interactive and at start of line */ |
| int lasttoken; /* last token read */ |
| int tokpushback; /* last token pushed back */ |
| char *wordtext; /* text of last word returned by readtoken */ |
| int checkkwd; |
| struct nodelist *backquotelist; |
| union node *redirnode; |
| struct heredoc *heredoc; |
| int quoteflag; /* set if (part of) last token was quoted */ |
| |
| |
| STATIC union node *list(int); |
| STATIC union node *andor(void); |
| STATIC union node *pipeline(void); |
| STATIC union node *command(void); |
| STATIC union node *simplecmd(void); |
| STATIC union node *makename(void); |
| STATIC void parsefname(void); |
| STATIC void parseheredoc(void); |
| STATIC int peektoken(void); |
| STATIC int readtoken(void); |
| STATIC int xxreadtoken(void); |
| STATIC int readtoken1(int, char const *, char *, int); |
| STATIC void synexpect(int) __attribute__((__noreturn__)); |
| STATIC void synerror(const char *) __attribute__((__noreturn__)); |
| STATIC void setprompt(int); |
| |
| |
| static inline int |
| isassignment(const char *p) |
| { |
| const char *q = endofname(p); |
| if (p == q) |
| return 0; |
| return *q == '='; |
| } |
| |
| static inline int realeofmark(const char *eofmark) |
| { |
| return eofmark && eofmark != FAKEEOFMARK; |
| } |
| |
| |
| /* |
| * Read and parse a command. Returns NEOF on end of file. (NULL is a |
| * valid parse tree indicating a blank line.) |
| */ |
| |
| union node * |
| parsecmd(int interact) |
| { |
| tokpushback = 0; |
| checkkwd = 0; |
| heredoclist = 0; |
| doprompt = interact; |
| if (doprompt) |
| setprompt(doprompt); |
| needprompt = 0; |
| return list(1); |
| } |
| |
| |
| STATIC union node * |
| list(int nlflag) |
| { |
| union node *n1, *n2, *n3; |
| int tok; |
| |
| n1 = NULL; |
| for (;;) { |
| switch (peektoken()) { |
| case TNL: |
| if (!(nlflag & 1)) |
| break; |
| parseheredoc(); |
| return n1; |
| |
| case TEOF: |
| if (!n1 && (nlflag & 1)) |
| n1 = NEOF; |
| parseheredoc(); |
| return n1; |
| } |
| |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (nlflag == 2 && tokendlist[peektoken()]) |
| return n1; |
| nlflag |= 2; |
| |
| n2 = andor(); |
| tok = readtoken(); |
| if (tok == TBACKGND) { |
| if (n2->type == NPIPE) { |
| n2->npipe.backgnd = 1; |
| } else { |
| if (n2->type != NREDIR) { |
| n3 = stalloc(sizeof(struct nredir)); |
| n3->nredir.n = n2; |
| n3->nredir.redirect = NULL; |
| n2 = n3; |
| } |
| n2->type = NBACKGND; |
| } |
| } |
| if (n1 == NULL) { |
| n1 = n2; |
| } |
| else { |
| n3 = (union node *)stalloc(sizeof (struct nbinary)); |
| n3->type = NSEMI; |
| n3->nbinary.ch1 = n1; |
| n3->nbinary.ch2 = n2; |
| n1 = n3; |
| } |
| switch (tok) { |
| case TNL: |
| case TEOF: |
| tokpushback++; |
| /* fall through */ |
| case TBACKGND: |
| case TSEMI: |
| break; |
| default: |
| if ((nlflag & 1)) |
| synexpect(-1); |
| tokpushback++; |
| return n1; |
| } |
| } |
| } |
| |
| |
| |
| STATIC union node * |
| andor(void) |
| { |
| union node *n1, *n2, *n3; |
| int t; |
| |
| n1 = pipeline(); |
| for (;;) { |
| if ((t = readtoken()) == TAND) { |
| t = NAND; |
| } else if (t == TOR) { |
| t = NOR; |
| } else { |
| tokpushback++; |
| return n1; |
| } |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| n2 = pipeline(); |
| n3 = (union node *)stalloc(sizeof (struct nbinary)); |
| n3->type = t; |
| n3->nbinary.ch1 = n1; |
| n3->nbinary.ch2 = n2; |
| n1 = n3; |
| } |
| } |
| |
| |
| |
| STATIC union node * |
| pipeline(void) |
| { |
| union node *n1, *n2, *pipenode; |
| struct nodelist *lp, *prev; |
| int negate; |
| |
| negate = 0; |
| TRACE(("pipeline: entered\n")); |
| if (readtoken() == TNOT) { |
| negate = !negate; |
| checkkwd = CHKKWD | CHKALIAS; |
| } else |
| tokpushback++; |
| n1 = command(); |
| if (readtoken() == TPIPE) { |
| pipenode = (union node *)stalloc(sizeof (struct npipe)); |
| pipenode->type = NPIPE; |
| pipenode->npipe.backgnd = 0; |
| lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
| pipenode->npipe.cmdlist = lp; |
| lp->n = n1; |
| do { |
| prev = lp; |
| lp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| lp->n = command(); |
| prev->next = lp; |
| } while (readtoken() == TPIPE); |
| lp->next = NULL; |
| n1 = pipenode; |
| } |
| tokpushback++; |
| if (negate) { |
| n2 = (union node *)stalloc(sizeof (struct nnot)); |
| n2->type = NNOT; |
| n2->nnot.com = n1; |
| return n2; |
| } else |
| return n1; |
| } |
| |
| |
| |
| STATIC union node * |
| command(void) |
| { |
| union node *n1, *n2; |
| union node *ap, **app; |
| union node *cp, **cpp; |
| union node *redir, **rpp; |
| union node **rpp2; |
| int t; |
| int savelinno; |
| |
| redir = NULL; |
| rpp2 = &redir; |
| |
| savelinno = plinno; |
| |
| switch (readtoken()) { |
| default: |
| synexpect(-1); |
| /* NOTREACHED */ |
| case TIF: |
| n1 = (union node *)stalloc(sizeof (struct nif)); |
| n1->type = NIF; |
| n1->nif.test = list(0); |
| if (readtoken() != TTHEN) |
| synexpect(TTHEN); |
| n1->nif.ifpart = list(0); |
| n2 = n1; |
| while (readtoken() == TELIF) { |
| n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif)); |
| n2 = n2->nif.elsepart; |
| n2->type = NIF; |
| n2->nif.test = list(0); |
| if (readtoken() != TTHEN) |
| synexpect(TTHEN); |
| n2->nif.ifpart = list(0); |
| } |
| if (lasttoken == TELSE) |
| n2->nif.elsepart = list(0); |
| else { |
| n2->nif.elsepart = NULL; |
| tokpushback++; |
| } |
| t = TFI; |
| break; |
| case TWHILE: |
| case TUNTIL: { |
| int got; |
| n1 = (union node *)stalloc(sizeof (struct nbinary)); |
| n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL; |
| n1->nbinary.ch1 = list(0); |
| if ((got=readtoken()) != TDO) { |
| TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : "")); |
| synexpect(TDO); |
| } |
| n1->nbinary.ch2 = list(0); |
| t = TDONE; |
| break; |
| } |
| case TFOR: |
| if (readtoken() != TWORD || quoteflag || ! goodname(wordtext)) |
| synerror("Bad for loop variable"); |
| n1 = (union node *)stalloc(sizeof (struct nfor)); |
| n1->type = NFOR; |
| n1->nfor.linno = savelinno; |
| n1->nfor.var = wordtext; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() == TIN) { |
| app = ≈ |
| while (readtoken() == TWORD) { |
| n2 = (union node *)stalloc(sizeof (struct narg)); |
| n2->type = NARG; |
| n2->narg.text = wordtext; |
| n2->narg.backquote = backquotelist; |
| *app = n2; |
| app = &n2->narg.next; |
| } |
| *app = NULL; |
| n1->nfor.args = ap; |
| if (lasttoken != TNL && lasttoken != TSEMI) |
| synexpect(-1); |
| } else { |
| n2 = (union node *)stalloc(sizeof (struct narg)); |
| n2->type = NARG; |
| n2->narg.text = (char *)dolatstr; |
| n2->narg.backquote = NULL; |
| n2->narg.next = NULL; |
| n1->nfor.args = n2; |
| /* |
| * Newline or semicolon here is optional (but note |
| * that the original Bourne shell only allowed NL). |
| */ |
| if (lasttoken != TSEMI) |
| tokpushback++; |
| } |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() != TDO) |
| synexpect(TDO); |
| n1->nfor.body = list(0); |
| t = TDONE; |
| break; |
| case TCASE: |
| n1 = (union node *)stalloc(sizeof (struct ncase)); |
| n1->type = NCASE; |
| n1->ncase.linno = savelinno; |
| if (readtoken() != TWORD) |
| synexpect(TWORD); |
| n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg)); |
| n2->type = NARG; |
| n2->narg.text = wordtext; |
| n2->narg.backquote = backquotelist; |
| n2->narg.next = NULL; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() != TIN) |
| synexpect(TIN); |
| cpp = &n1->ncase.cases; |
| next_case: |
| checkkwd = CHKNL | CHKKWD; |
| t = readtoken(); |
| while(t != TESAC) { |
| if (lasttoken == TLP) |
| readtoken(); |
| *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); |
| cp->type = NCLIST; |
| app = &cp->nclist.pattern; |
| for (;;) { |
| *app = ap = (union node *)stalloc(sizeof (struct narg)); |
| ap->type = NARG; |
| ap->narg.text = wordtext; |
| ap->narg.backquote = backquotelist; |
| if (readtoken() != TPIPE) |
| break; |
| app = &ap->narg.next; |
| readtoken(); |
| } |
| ap->narg.next = NULL; |
| if (lasttoken != TRP) |
| synexpect(TRP); |
| cp->nclist.body = list(2); |
| |
| cpp = &cp->nclist.next; |
| |
| checkkwd = CHKNL | CHKKWD; |
| if ((t = readtoken()) != TESAC) { |
| if (t != TENDCASE) |
| synexpect(TENDCASE); |
| else |
| goto next_case; |
| } |
| } |
| *cpp = NULL; |
| goto redir; |
| case TLP: |
| n1 = (union node *)stalloc(sizeof (struct nredir)); |
| n1->type = NSUBSHELL; |
| n1->nredir.linno = savelinno; |
| n1->nredir.n = list(0); |
| n1->nredir.redirect = NULL; |
| t = TRP; |
| break; |
| case TBEGIN: |
| n1 = list(0); |
| t = TEND; |
| break; |
| case TWORD: |
| case TREDIR: |
| tokpushback++; |
| return simplecmd(); |
| } |
| |
| if (readtoken() != t) |
| synexpect(t); |
| |
| redir: |
| /* Now check for redirection which may follow command */ |
| checkkwd = CHKKWD | CHKALIAS; |
| rpp = rpp2; |
| while (readtoken() == TREDIR) { |
| *rpp = n2 = redirnode; |
| rpp = &n2->nfile.next; |
| parsefname(); |
| } |
| tokpushback++; |
| *rpp = NULL; |
| if (redir) { |
| if (n1->type != NSUBSHELL) { |
| n2 = (union node *)stalloc(sizeof (struct nredir)); |
| n2->type = NREDIR; |
| n2->nredir.linno = savelinno; |
| n2->nredir.n = n1; |
| n1 = n2; |
| } |
| n1->nredir.redirect = redir; |
| } |
| |
| return n1; |
| } |
| |
| |
| STATIC union node * |
| simplecmd(void) { |
| union node *args, **app; |
| union node *n = NULL; |
| union node *vars, **vpp; |
| union node **rpp, *redir; |
| int savecheckkwd; |
| int savelinno; |
| |
| args = NULL; |
| app = &args; |
| vars = NULL; |
| vpp = &vars; |
| redir = NULL; |
| rpp = &redir; |
| |
| savecheckkwd = CHKALIAS; |
| savelinno = plinno; |
| for (;;) { |
| checkkwd = savecheckkwd; |
| switch (readtoken()) { |
| case TWORD: |
| n = (union node *)stalloc(sizeof (struct narg)); |
| n->type = NARG; |
| n->narg.text = wordtext; |
| n->narg.backquote = backquotelist; |
| if (savecheckkwd && isassignment(wordtext)) { |
| *vpp = n; |
| vpp = &n->narg.next; |
| } else { |
| *app = n; |
| app = &n->narg.next; |
| savecheckkwd = 0; |
| } |
| break; |
| case TREDIR: |
| *rpp = n = redirnode; |
| rpp = &n->nfile.next; |
| parsefname(); /* read name of redirection file */ |
| break; |
| case TLP: |
| if ( |
| args && app == &args->narg.next && |
| !vars && !redir |
| ) { |
| struct builtincmd *bcmd; |
| const char *name; |
| |
| /* We have a function */ |
| if (readtoken() != TRP) |
| synexpect(TRP); |
| name = n->narg.text; |
| if ( |
| !goodname(name) || ( |
| (bcmd = find_builtin(name)) && |
| bcmd->flags & BUILTIN_SPECIAL |
| ) |
| ) |
| synerror("Bad function name"); |
| n->type = NDEFUN; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| n->ndefun.text = n->narg.text; |
| n->ndefun.linno = plinno; |
| n->ndefun.body = command(); |
| return n; |
| } |
| /* fall through */ |
| default: |
| tokpushback++; |
| goto out; |
| } |
| } |
| out: |
| *app = NULL; |
| *vpp = NULL; |
| *rpp = NULL; |
| n = (union node *)stalloc(sizeof (struct ncmd)); |
| n->type = NCMD; |
| n->ncmd.linno = savelinno; |
| n->ncmd.args = args; |
| n->ncmd.assign = vars; |
| n->ncmd.redirect = redir; |
| return n; |
| } |
| |
| STATIC union node * |
| makename(void) |
| { |
| union node *n; |
| |
| n = (union node *)stalloc(sizeof (struct narg)); |
| n->type = NARG; |
| n->narg.next = NULL; |
| n->narg.text = wordtext; |
| n->narg.backquote = backquotelist; |
| return n; |
| } |
| |
| void fixredir(union node *n, const char *text, int err) |
| { |
| TRACE(("Fix redir %s %d\n", text, err)); |
| if (!err) |
| n->ndup.vname = NULL; |
| |
| if (is_digit(text[0]) && text[1] == '\0') |
| n->ndup.dupfd = digit_val(text[0]); |
| else if (text[0] == '-' && text[1] == '\0') |
| n->ndup.dupfd = -1; |
| else { |
| |
| if (err) |
| synerror("Bad fd number"); |
| else |
| n->ndup.vname = makename(); |
| } |
| } |
| |
| |
| STATIC void |
| parsefname(void) |
| { |
| union node *n = redirnode; |
| |
| if (n->type == NHERE) |
| checkkwd = CHKEOFMARK; |
| if (readtoken() != TWORD) |
| synexpect(-1); |
| if (n->type == NHERE) { |
| struct heredoc *here = heredoc; |
| struct heredoc *p; |
| |
| if (quoteflag == 0) |
| n->type = NXHERE; |
| TRACE(("Here document %d\n", n->type)); |
| rmescapes(wordtext); |
| here->eofmark = wordtext; |
| here->next = NULL; |
| if (heredoclist == NULL) |
| heredoclist = here; |
| else { |
| for (p = heredoclist ; p->next ; p = p->next); |
| p->next = here; |
| } |
| } else if (n->type == NTOFD || n->type == NFROMFD) { |
| fixredir(n, wordtext, 0); |
| } else { |
| n->nfile.fname = makename(); |
| } |
| } |
| |
| |
| /* |
| * Input any here documents. |
| */ |
| |
| STATIC void |
| parseheredoc(void) |
| { |
| struct heredoc *here; |
| union node *n; |
| |
| here = heredoclist; |
| heredoclist = 0; |
| |
| while (here) { |
| if (needprompt) { |
| setprompt(2); |
| } |
| readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, |
| here->eofmark, here->striptabs); |
| n = (union node *)stalloc(sizeof (struct narg)); |
| n->narg.type = NARG; |
| n->narg.next = NULL; |
| n->narg.text = wordtext; |
| n->narg.backquote = backquotelist; |
| here->here->nhere.doc = n; |
| here = here->next; |
| } |
| } |
| |
| STATIC int |
| peektoken(void) |
| { |
| int t; |
| |
| t = readtoken(); |
| tokpushback++; |
| return (t); |
| } |
| |
| STATIC int |
| readtoken(void) |
| { |
| int t; |
| int kwd = checkkwd; |
| #ifdef DEBUG |
| int alreadyseen = tokpushback; |
| #endif |
| |
| top: |
| t = xxreadtoken(); |
| |
| /* |
| * eat newlines |
| */ |
| if (kwd & CHKNL) { |
| while (t == TNL) { |
| parseheredoc(); |
| t = xxreadtoken(); |
| } |
| } |
| |
| if (t != TWORD || quoteflag) { |
| goto out; |
| } |
| |
| /* |
| * check for keywords |
| */ |
| if (kwd & CHKKWD) { |
| const char *const *pp; |
| |
| if ((pp = findkwd(wordtext))) { |
| lasttoken = t = pp - parsekwd + KWDOFFSET; |
| TRACE(("keyword %s recognized\n", tokname[t])); |
| goto out; |
| } |
| } |
| |
| if (checkkwd & CHKALIAS) { |
| struct alias *ap; |
| if ((ap = lookupalias(wordtext, 1)) != NULL) { |
| if (*ap->val) { |
| pushstring(ap->val, ap); |
| } |
| goto top; |
| } |
| } |
| out: |
| checkkwd = 0; |
| #ifdef DEBUG |
| if (!alreadyseen) |
| TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); |
| else |
| TRACE(("reread token %s %s\n", tokname[t], t == TWORD ? wordtext : "")); |
| #endif |
| return (t); |
| } |
| |
| static void nlprompt(void) |
| { |
| plinno++; |
| if (doprompt) |
| setprompt(2); |
| } |
| |
| static void nlnoprompt(void) |
| { |
| plinno++; |
| needprompt = doprompt; |
| } |
| |
| |
| /* |
| * Read the next input token. |
| * If the token is a word, we set backquotelist to the list of cmds in |
| * backquotes. We set quoteflag to true if any part of the word was |
| * quoted. |
| * If the token is TREDIR, then we set redirnode to a structure containing |
| * the redirection. |
| * |
| * [Change comment: here documents and internal procedures] |
| * [Readtoken shouldn't have any arguments. Perhaps we should make the |
| * word parsing code into a separate routine. In this case, readtoken |
| * doesn't need to have any internal procedures, but parseword does. |
| * We could also make parseoperator in essence the main routine, and |
| * have parseword (readtoken1?) handle both words and redirection.] |
| */ |
| |
| #define RETURN(token) return lasttoken = token |
| |
| STATIC int |
| xxreadtoken(void) |
| { |
| int c; |
| |
| if (tokpushback) { |
| tokpushback = 0; |
| return lasttoken; |
| } |
| if (needprompt) { |
| setprompt(2); |
| } |
| for (;;) { /* until token or start of word found */ |
| c = pgetc(); |
| switch (c) { |
| case ' ': case '\t': |
| case PEOA: |
| continue; |
| case '#': |
| while ((c = pgetc()) != '\n' && c != PEOF); |
| pungetc(); |
| continue; |
| case '\\': |
| if (pgetc() == '\n') { |
| nlprompt(); |
| continue; |
| } |
| pungetc(); |
| goto breakloop; |
| case '\n': |
| nlnoprompt(); |
| RETURN(TNL); |
| case PEOF: |
| RETURN(TEOF); |
| case '&': |
| if (pgetc() == '&') |
| RETURN(TAND); |
| pungetc(); |
| RETURN(TBACKGND); |
| case '|': |
| if (pgetc() == '|') |
| RETURN(TOR); |
| pungetc(); |
| RETURN(TPIPE); |
| case ';': |
| if (pgetc() == ';') |
| RETURN(TENDCASE); |
| pungetc(); |
| RETURN(TSEMI); |
| case '(': |
| RETURN(TLP); |
| case ')': |
| RETURN(TRP); |
| default: |
| goto breakloop; |
| } |
| } |
| breakloop: |
| return readtoken1(c, BASESYNTAX, (char *)NULL, 0); |
| #undef RETURN |
| } |
| |
| static int pgetc_eatbnl(void) |
| { |
| int c; |
| |
| while ((c = pgetc()) == '\\') { |
| if (pgetc() != '\n') { |
| pungetc(); |
| break; |
| } |
| |
| nlprompt(); |
| } |
| |
| return c; |
| } |
| |
| |
| |
| /* |
| * If eofmark is NULL, read a word or a redirection symbol. If eofmark |
| * is not NULL, read a here document. In the latter case, eofmark is the |
| * word which marks the end of the document and striptabs is true if |
| * leading tabs should be stripped from the document. The argument firstc |
| * is the first character of the input token or document. |
| * |
| * Because C does not have internal subroutines, I have simulated them |
| * using goto's to implement the subroutine linkage. The following macros |
| * will run code that appears at the end of readtoken1. |
| */ |
| |
| #define CHECKEND() {goto checkend; checkend_return:;} |
| #define PARSEREDIR() {goto parseredir; parseredir_return:;} |
| #define PARSESUB() {goto parsesub; parsesub_return:;} |
| #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} |
| #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} |
| #define PARSEARITH() {goto parsearith; parsearith_return:;} |
| |
| STATIC int |
| readtoken1(int firstc, char const *syntax, char *eofmark, int striptabs) |
| { |
| int c = firstc; |
| char *out; |
| size_t len; |
| struct nodelist *bqlist; |
| int quotef; |
| int dblquote; |
| int varnest; /* levels of variables expansion */ |
| int arinest; /* levels of arithmetic expansion */ |
| int parenlevel; /* levels of parens in arithmetic */ |
| int dqvarnest; /* levels of variables expansion within double quotes */ |
| int oldstyle; |
| /* syntax before arithmetic */ |
| char const *uninitialized_var(prevsyntax); |
| |
| dblquote = 0; |
| if (syntax == DQSYNTAX) |
| dblquote = 1; |
| quotef = 0; |
| bqlist = NULL; |
| varnest = 0; |
| arinest = 0; |
| parenlevel = 0; |
| dqvarnest = 0; |
| |
| STARTSTACKSTR(out); |
| loop: { /* for each line, until end of word */ |
| #if ATTY |
| if (c == '\034' && doprompt |
| && attyset() && ! equal(termval(), "emacs")) { |
| attyline(); |
| if (syntax == BASESYNTAX) |
| return readtoken(); |
| c = pgetc(); |
| goto loop; |
| } |
| #endif |
| CHECKEND(); /* set c to PEOF if at end of here document */ |
| for (;;) { /* until end of line or end of word */ |
| CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ |
| switch(syntax[c]) { |
| case CNL: /* '\n' */ |
| if (syntax == BASESYNTAX) |
| goto endword; /* exit outer loop */ |
| USTPUTC(c, out); |
| nlprompt(); |
| c = pgetc(); |
| goto loop; /* continue outer loop */ |
| case CWORD: |
| USTPUTC(c, out); |
| break; |
| case CCTL: |
| if (eofmark == NULL || dblquote) |
| USTPUTC(CTLESC, out); |
| USTPUTC(c, out); |
| break; |
| /* backslash */ |
| case CBACK: |
| c = pgetc2(); |
| if (c == PEOF) { |
| USTPUTC(CTLESC, out); |
| USTPUTC('\\', out); |
| pungetc(); |
| } else if (c == '\n') { |
| nlprompt(); |
| } else { |
| if ( |
| dblquote && |
| c != '\\' && c != '`' && |
| c != '$' && ( |
| c != '"' || |
| eofmark != NULL |
| ) |
| ) { |
| USTPUTC('\\', out); |
| } |
| USTPUTC(CTLESC, out); |
| USTPUTC(c, out); |
| quotef++; |
| } |
| break; |
| case CSQUOTE: |
| syntax = SQSYNTAX; |
| quotemark: |
| if (eofmark == NULL) { |
| USTPUTC(CTLQUOTEMARK, out); |
| } |
| break; |
| case CDQUOTE: |
| syntax = DQSYNTAX; |
| dblquote = 1; |
| goto quotemark; |
| case CENDQUOTE: |
| if (eofmark && !varnest) |
| USTPUTC(c, out); |
| else { |
| if (dqvarnest == 0) { |
| syntax = BASESYNTAX; |
| dblquote = 0; |
| } |
| quotef++; |
| goto quotemark; |
| } |
| break; |
| case CVAR: /* '$' */ |
| PARSESUB(); /* parse substitution */ |
| break; |
| case CENDVAR: /* '}' */ |
| if (varnest > 0) { |
| varnest--; |
| if (dqvarnest > 0) { |
| dqvarnest--; |
| } |
| USTPUTC(CTLENDVAR, out); |
| } else { |
| USTPUTC(c, out); |
| } |
| break; |
| case CLP: /* '(' in arithmetic */ |
| parenlevel++; |
| USTPUTC(c, out); |
| break; |
| case CRP: /* ')' in arithmetic */ |
| if (parenlevel > 0) { |
| USTPUTC(c, out); |
| --parenlevel; |
| } else { |
| if (pgetc() == ')') { |
| USTPUTC(CTLENDARI, out); |
| if (!--arinest) |
| syntax = prevsyntax; |
| } else { |
| /* |
| * unbalanced parens |
| * (don't 2nd guess - no error) |
| */ |
| pungetc(); |
| USTPUTC(')', out); |
| } |
| } |
| break; |
| case CBQUOTE: /* '`' */ |
| PARSEBACKQOLD(); |
| break; |
| case CEOF: |
| goto endword; /* exit outer loop */ |
| case CIGN: |
| break; |
| default: |
| if (varnest == 0) |
| goto endword; /* exit outer loop */ |
| if (c != PEOA) { |
| USTPUTC(c, out); |
| } |
| } |
| c = pgetc(); |
| } |
| } |
| endword: |
| if (syntax == ARISYNTAX) |
| synerror("Missing '))'"); |
| if (syntax != BASESYNTAX && eofmark == NULL) |
| synerror("Unterminated quoted string"); |
| if (varnest != 0) { |
| /* { */ |
| synerror("Missing '}'"); |
| } |
| USTPUTC('\0', out); |
| len = out - (char *)stackblock(); |
| out = stackblock(); |
| if (eofmark == NULL) { |
| if ((c == '>' || c == '<') |
| && quotef == 0 |
| && len <= 2 |
| && (*out == '\0' || is_digit(*out))) { |
| PARSEREDIR(); |
| return lasttoken = TREDIR; |
| } else { |
| pungetc(); |
| } |
| } |
| quoteflag = quotef; |
| backquotelist = bqlist; |
| grabstackblock(len); |
| wordtext = out; |
| return lasttoken = TWORD; |
| /* end of readtoken routine */ |
| |
| |
| |
| /* |
| * Check to see whether we are at the end of the here document. When this |
| * is called, c is set to the first character of the next input line. If |
| * we are at the end of the here document, this routine sets the c to PEOF. |
| */ |
| |
| checkend: { |
| if (realeofmark(eofmark)) { |
| int markloc; |
| char *p; |
| |
| if (c == PEOA) { |
| c = pgetc2(); |
| } |
| if (striptabs) { |
| while (c == '\t') { |
| c = pgetc2(); |
| } |
| } |
| |
| markloc = out - (char *)stackblock(); |
| for (p = eofmark; STPUTC(c, out), *p; p++) { |
| if (c != *p) |
| goto more_heredoc; |
| |
| c = pgetc2(); |
| } |
| |
| if (c == '\n' || c == PEOF) { |
| c = PEOF; |
| nlnoprompt(); |
| } else { |
| int len; |
| |
| more_heredoc: |
| p = (char *)stackblock() + markloc + 1; |
| len = out - p; |
| |
| if (len) { |
| len -= c < 0; |
| c = p[-1]; |
| |
| if (len) { |
| char *str; |
| |
| str = alloca(len + 1); |
| *(char *)mempcpy(str, p, len) = 0; |
| |
| pushstring(str, NULL); |
| } |
| } |
| } |
| |
| STADJUST((char *)stackblock() + markloc - out, out); |
| } |
| goto checkend_return; |
| } |
| |
| |
| /* |
| * Parse a redirection operator. The variable "out" points to a string |
| * specifying the fd to be redirected. The variable "c" contains the |
| * first character of the redirection operator. |
| */ |
| |
| parseredir: { |
| char fd = *out; |
| union node *np; |
| |
| np = (union node *)stalloc(sizeof (struct nfile)); |
| if (c == '>') { |
| np->nfile.fd = 1; |
| c = pgetc(); |
| if (c == '>') |
| np->type = NAPPEND; |
| else if (c == '|') |
| np->type = NCLOBBER; |
| else if (c == '&') |
| np->type = NTOFD; |
| else { |
| np->type = NTO; |
| pungetc(); |
| } |
| } else { /* c == '<' */ |
| np->nfile.fd = 0; |
| switch (c = pgetc()) { |
| case '<': |
| if (sizeof (struct nfile) != sizeof (struct nhere)) { |
| np = (union node *)stalloc(sizeof (struct nhere)); |
| np->nfile.fd = 0; |
| } |
| np->type = NHERE; |
| heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc)); |
| heredoc->here = np; |
| if ((c = pgetc()) == '-') { |
| heredoc->striptabs = 1; |
| } else { |
| heredoc->striptabs = 0; |
| pungetc(); |
| } |
| break; |
| |
| case '&': |
| np->type = NFROMFD; |
| break; |
| |
| case '>': |
| np->type = NFROMTO; |
| break; |
| |
| default: |
| np->type = NFROM; |
| pungetc(); |
| break; |
| } |
| } |
| if (fd != '\0') |
| np->nfile.fd = digit_val(fd); |
| redirnode = np; |
| goto parseredir_return; |
| } |
| |
| |
| /* |
| * Parse a substitution. At this point, we have read the dollar sign |
| * and nothing else. |
| */ |
| |
| parsesub: { |
| int subtype; |
| int typeloc; |
| char *p; |
| static const char types[] = "}-+?="; |
| |
| c = pgetc_eatbnl(); |
| if ( |
| (checkkwd & CHKEOFMARK) || |
| c <= PEOA || |
| (c != '(' && c != '{' && !is_name(c) && !is_special(c)) |
| ) { |
| USTPUTC('$', out); |
| pungetc(); |
| } else if (c == '(') { /* $(command) or $((arith)) */ |
| if (pgetc_eatbnl() == '(') { |
| PARSEARITH(); |
| } else { |
| pungetc(); |
| PARSEBACKQNEW(); |
| } |
| } else { |
| USTPUTC(CTLVAR, out); |
| typeloc = out - (char *)stackblock(); |
| STADJUST(1, out); |
| subtype = VSNORMAL; |
| if (likely(c == '{')) { |
| c = pgetc_eatbnl(); |
| subtype = 0; |
| } |
| varname: |
| if (is_name(c)) { |
| do { |
| STPUTC(c, out); |
| c = pgetc_eatbnl(); |
| } while (is_in_name(c)); |
| } else if (is_digit(c)) { |
| do { |
| STPUTC(c, out); |
| c = pgetc_eatbnl(); |
| } while (is_digit(c)); |
| } |
| else if (is_special(c)) { |
| int cc = c; |
| |
| c = pgetc_eatbnl(); |
| |
| if (!subtype && cc == '#') { |
| subtype = VSLENGTH; |
| |
| if (c == '_' || isalnum(c)) |
| goto varname; |
| |
| cc = c; |
| c = pgetc_eatbnl(); |
| if (cc == '}' || c != '}') { |
| pungetc(); |
| subtype = 0; |
| c = cc; |
| cc = '#'; |
| } |
| } |
| |
| USTPUTC(cc, out); |
| } |
| else |
| goto badsub; |
| |
| if (subtype == 0) { |
| switch (c) { |
| case ':': |
| subtype = VSNUL; |
| c = pgetc_eatbnl(); |
| /*FALLTHROUGH*/ |
| default: |
| p = strchr(types, c); |
| if (p == NULL) |
| break; |
| subtype |= p - types + VSNORMAL; |
| break; |
| case '%': |
| case '#': |
| { |
| int cc = c; |
| subtype = c == '#' ? VSTRIMLEFT : |
| VSTRIMRIGHT; |
| c = pgetc_eatbnl(); |
| if (c == cc) |
| subtype++; |
| else |
| pungetc(); |
| break; |
| } |
| } |
| } else { |
| badsub: |
| pungetc(); |
| } |
| *((char *)stackblock() + typeloc) = subtype; |
| if (subtype != VSNORMAL) { |
| varnest++; |
| if (dblquote) |
| dqvarnest++; |
| } |
| STPUTC('=', out); |
| } |
| goto parsesub_return; |
| } |
| |
| |
| /* |
| * Called to parse command substitutions. Newstyle is set if the command |
| * is enclosed inside $(...); nlpp is a pointer to the head of the linked |
| * list of commands (passed by reference), and savelen is the number of |
| * characters on the top of the stack which must be preserved. |
| */ |
| |
| parsebackq: { |
| struct nodelist **nlpp; |
| union node *n; |
| char *str; |
| size_t savelen; |
| int uninitialized_var(saveprompt); |
| |
| str = NULL; |
| savelen = out - (char *)stackblock(); |
| if (savelen > 0) { |
| str = alloca(savelen); |
| memcpy(str, stackblock(), savelen); |
| } |
| if (oldstyle) { |
| /* We must read until the closing backquote, giving special |
| treatment to some slashes, and then push the string and |
| reread it as input, interpreting it normally. */ |
| char *pout; |
| int pc; |
| size_t psavelen; |
| char *pstr; |
| |
| |
| STARTSTACKSTR(pout); |
| for (;;) { |
| if (needprompt) { |
| setprompt(2); |
| } |
| switch (pc = pgetc()) { |
| case '`': |
| goto done; |
| |
| case '\\': |
| if ((pc = pgetc()) == '\n') { |
| nlprompt(); |
| /* |
| * If eating a newline, avoid putting |
| * the newline into the new character |
| * stream (via the STPUTC after the |
| * switch). |
| */ |
| continue; |
| } |
| if (pc != '\\' && pc != '`' && pc != '$' |
| && (!dblquote || pc != '"')) |
| STPUTC('\\', pout); |
| if (pc > PEOA) { |
| break; |
| } |
| /* fall through */ |
| |
| case PEOF: |
| case PEOA: |
| synerror("EOF in backquote substitution"); |
| |
| case '\n': |
| nlnoprompt(); |
| break; |
| |
| default: |
| break; |
| } |
| STPUTC(pc, pout); |
| } |
| done: |
| STPUTC('\0', pout); |
| psavelen = pout - (char *)stackblock(); |
| if (psavelen > 0) { |
| pstr = grabstackstr(pout); |
| setinputstring(pstr); |
| } |
| } |
| nlpp = &bqlist; |
| while (*nlpp) |
| nlpp = &(*nlpp)->next; |
| *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); |
| (*nlpp)->next = NULL; |
| |
| if (oldstyle) { |
| saveprompt = doprompt; |
| doprompt = 0; |
| } |
| |
| n = list(2); |
| |
| if (oldstyle) |
| doprompt = saveprompt; |
| else { |
| if (readtoken() != TRP) |
| synexpect(TRP); |
| } |
| |
| (*nlpp)->n = n; |
| if (oldstyle) { |
| /* |
| * Start reading from old file again, ignoring any pushed back |
| * tokens left from the backquote parsing |
| */ |
| popfile(); |
| tokpushback = 0; |
| } |
| while (stackblocksize() <= savelen) |
| growstackblock(); |
| STARTSTACKSTR(out); |
| if (str) { |
| memcpy(out, str, savelen); |
| STADJUST(savelen, out); |
| } |
| USTPUTC(CTLBACKQ, out); |
| if (oldstyle) |
| goto parsebackq_oldreturn; |
| else |
| goto parsebackq_newreturn; |
| } |
| |
| /* |
| * Parse an arithmetic expansion (indicate start of one and set state) |
| */ |
| parsearith: { |
| |
| if (++arinest == 1) { |
| prevsyntax = syntax; |
| syntax = ARISYNTAX; |
| } |
| USTPUTC(CTLARI, out); |
| goto parsearith_return; |
| } |
| |
| } /* end of readtoken */ |
| |
| |
| |
| #ifdef mkinit |
| INCLUDE "parser.h" |
| #endif |
| |
| |
| /* |
| * Return of a legal variable name (a letter or underscore followed by zero or |
| * more letters, underscores, and digits). |
| */ |
| |
| char * |
| endofname(const char *name) |
| { |
| char *p; |
| |
| p = (char *) name; |
| if (! is_name(*p)) |
| return p; |
| while (*++p) { |
| if (! is_in_name(*p)) |
| break; |
| } |
| return p; |
| } |
| |
| |
| /* |
| * Called when an unexpected token is read during the parse. The argument |
| * is the token that is expected, or -1 if more than one type of token can |
| * occur at this point. |
| */ |
| |
| STATIC void |
| synexpect(int token) |
| { |
| char msg[64]; |
| |
| if (token >= 0) { |
| fmtstr(msg, 64, "%s unexpected (expecting %s)", |
| tokname[lasttoken], tokname[token]); |
| } else { |
| fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]); |
| } |
| synerror(msg); |
| /* NOTREACHED */ |
| } |
| |
| |
| STATIC void |
| synerror(const char *msg) |
| { |
| errlinno = plinno; |
| sh_error("Syntax error: %s", msg); |
| /* NOTREACHED */ |
| } |
| |
| STATIC void |
| setprompt(int which) |
| { |
| struct stackmark smark; |
| int show; |
| |
| needprompt = 0; |
| whichprompt = which; |
| |
| #ifdef SMALL |
| show = 1; |
| #else |
| show = !el; |
| #endif |
| if (show) { |
| pushstackmark(&smark, stackblocksize()); |
| out2str(getprompt(NULL)); |
| popstackmark(&smark); |
| } |
| } |
| |
| const char * |
| expandstr(const char *ps) |
| { |
| union node n; |
| int saveprompt; |
| |
| /* XXX Fix (char *) cast. */ |
| setinputstring((char *)ps); |
| |
| saveprompt = doprompt; |
| doprompt = 0; |
| |
| readtoken1(pgetc(), DQSYNTAX, FAKEEOFMARK, 0); |
| |
| doprompt = saveprompt; |
| |
| popfile(); |
| |
| n.narg.type = NARG; |
| n.narg.next = NULL; |
| n.narg.text = wordtext; |
| n.narg.backquote = backquotelist; |
| |
| expandarg(&n, NULL, EXP_QUOTED); |
| return stackblock(); |
| } |
| |
| /* |
| * called by editline -- any expansions to the prompt |
| * should be added here. |
| */ |
| const char * |
| getprompt(void *unused) |
| { |
| const char *prompt; |
| |
| switch (whichprompt) { |
| default: |
| #ifdef DEBUG |
| return "<internal prompt error>"; |
| #endif |
| case 0: |
| return nullstr; |
| case 1: |
| prompt = ps1val(); |
| break; |
| case 2: |
| prompt = ps2val(); |
| break; |
| } |
| |
| return expandstr(prompt); |
| } |
| |
| const char *const * |
| findkwd(const char *s) |
| { |
| return findstring( |
| s, parsekwd, sizeof(parsekwd) / sizeof(const char *) |
| ); |
| } |