diff options
Diffstat (limited to 'bin/dash/src/parser.c')
| -rw-r--r-- | bin/dash/src/parser.c | 1677 |
1 files changed, 0 insertions, 1677 deletions
diff --git a/bin/dash/src/parser.c b/bin/dash/src/parser.c deleted file mode 100644 index 499f7f8e..00000000 --- a/bin/dash/src/parser.c +++ /dev/null @@ -1,1677 +0,0 @@ -/*- - * 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 synstack { - const char *syntax; - struct synstack *prev; - struct synstack *next; - int innerdq; - int varpushed; - int dblquote; - int varnest; /* levels of variables expansion */ - int parenlevel; /* levels of parens in arithmetic */ - int dqvarnest; /* levels of variables expansion within double quotes */ -}; - - - -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 char *promptcache; -static char *rpromptcache; - - -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 readtoken(void); -STATIC int xxreadtoken(void); -STATIC int pgetc_eatbnl(); -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); - - -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) -{ - int chknl = nlflag & 1 ? 0 : CHKNL; - union node *n1, *n2, *n3; - int tok; - - n1 = NULL; - for (;;) { - checkkwd = chknl | CHKKWD | CHKALIAS; - tok = readtoken(); - switch (tok) { - case TNL: - parseheredoc(); - return n1; - - case TEOF: - if (!n1 && !chknl) - n1 = NEOF; -out_eof: - parseheredoc(); - tokpushback++; - lasttoken = TEOF; - return n1; - } - - tokpushback++; - if (nlflag == 2 && tokendlist[tok]) - 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 TEOF: - goto out_eof; - case TNL: - tokpushback++; - /* fall through */ - case TBACKGND: - case TSEMI: - break; - default: - if (!chknl) - 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); - } - if (here->here->type == NHERE) - readtoken1(pgetc(), SQSYNTAX, here->eofmark, here->striptabs); - else - readtoken1(pgetc_eatbnl(), 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 -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(); - checkkwd = 0; - t = xxreadtoken(); - } - } - - kwd |= checkkwd; - checkkwd = 0; - - 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 (kwd & CHKALIAS) { - struct alias *ap; - if ((ap = lookupalias(wordtext, 1)) != NULL) { - if (*ap->val) { - pushstring(ap->val, ap); - } - goto top; - } - } -out: -#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_eatbnl(); - switch (c) { - case ' ': case '\t': - case PEOA: - continue; - case '#': - while ((c = pgetc()) != '\n' && c != PEOF); - pungetc(); - continue; - case '\n': - nlnoprompt(); - RETURN(TNL); - case PEOF: - RETURN(TEOF); - case '&': - if (pgetc_eatbnl() == '&') - RETURN(TAND); - pungetc(); - RETURN(TBACKGND); - case '|': - if (pgetc_eatbnl() == '|') - RETURN(TOR); - pungetc(); - RETURN(TPIPE); - case ';': - if (pgetc_eatbnl() == ';') - RETURN(TENDCASE); - pungetc(); - RETURN(TSEMI); - case '(': - RETURN(TLP); - case ')': - RETURN(TRP); - } - break; - } - return readtoken1(c, BASESYNTAX, (char *)NULL, 0); -#undef RETURN -} - -static int pgetc_eatbnl(void) -{ - int c; - - while ((c = pgetc()) == '\\') { - if (pgetc2() != '\n') { - pungetc(); - break; - } - - nlprompt(); - } - - return c; -} - -static int pgetc_top(struct synstack *stack) -{ - return stack->syntax == SQSYNTAX ? pgetc() : pgetc_eatbnl(); -} - -static void synstack_push(struct synstack **stack, struct synstack *next, - const char *syntax) -{ - memset(next, 0, sizeof(*next)); - next->syntax = syntax; - next->next = *stack; - (*stack)->prev = next; - *stack = next; -} - -static void synstack_pop(struct synstack **stack) -{ - *stack = (*stack)->next; -} - - - -/* - * 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 oldstyle; - /* syntax stack */ - struct synstack synbase = { .syntax = syntax }; - struct synstack *synstack = &synbase; - - if (syntax == DQSYNTAX) - synstack->dblquote = 1; - quotef = 0; - bqlist = NULL; - - STARTSTACKSTR(out); - loop: { /* for each line, until end of word */ -#if ATTY - if (c == '\034' && doprompt - && attyset() && ! equal(termval(), "emacs")) { - attyline(); - if (synstack->syntax == BASESYNTAX) - return readtoken(); - c = pgetc_top(synstack); - 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(synstack->syntax[c]) { - case CNL: /* '\n' */ - if (synstack->syntax == BASESYNTAX && - !synstack->varnest) - goto endword; /* exit outer loop */ - USTPUTC(c, out); - nlprompt(); - c = pgetc_top(synstack); - goto loop; /* continue outer loop */ - case CWORD: - USTPUTC(c, out); - break; - case CCTL: - if ((!eofmark) | synstack->dblquote | - synstack->varnest) - USTPUTC(CTLESC, out); - USTPUTC(c, out); - break; - /* backslash */ - case CBACK: - c = pgetc2(); - if (c == PEOF) { - USTPUTC(CTLESC, out); - USTPUTC('\\', out); - pungetc(); - } else { - if ( - synstack->dblquote && - c != '\\' && c != '`' && - c != '$' && ( - c != '"' || - (eofmark != NULL && - !synstack->varnest) - ) && ( - c != '}' || - !synstack->varnest - ) - ) { - USTPUTC(CTLESC, out); - USTPUTC('\\', out); - } - USTPUTC(CTLESC, out); - USTPUTC(c, out); - quotef++; - } - break; - case CSQUOTE: - synstack->syntax = SQSYNTAX; -quotemark: - if (eofmark == NULL) { - USTPUTC(CTLQUOTEMARK, out); - } - break; - case CDQUOTE: - synstack->syntax = DQSYNTAX; - synstack->dblquote = 1; -toggledq: - if (synstack->varnest) - synstack->innerdq ^= 1; - goto quotemark; - case CENDQUOTE: - if (eofmark && !synstack->varnest) { - USTPUTC(c, out); - break; - } - - if (synstack->dqvarnest == 0) { - synstack->syntax = BASESYNTAX; - synstack->dblquote = 0; - } - - quotef++; - - if (c == '"') - goto toggledq; - - goto quotemark; - case CVAR: /* '$' */ - PARSESUB(); /* parse substitution */ - break; - case CENDVAR: /* '}' */ - if (!synstack->innerdq && - synstack->varnest > 0) { - if (!--synstack->varnest && - synstack->varpushed) - synstack_pop(&synstack); - else if (synstack->dqvarnest > 0) - synstack->dqvarnest--; - USTPUTC(CTLENDVAR, out); - } else { - USTPUTC(c, out); - } - break; - case CLP: /* '(' in arithmetic */ - synstack->parenlevel++; - USTPUTC(c, out); - break; - case CRP: /* ')' in arithmetic */ - if (synstack->parenlevel > 0) { - USTPUTC(c, out); - --synstack->parenlevel; - } else { - if (pgetc_eatbnl() == ')') { - USTPUTC(CTLENDARI, out); - synstack_pop(&synstack); - } else { - /* - * unbalanced parens - * (don't 2nd guess - no error) - */ - pungetc(); - USTPUTC(')', out); - } - } - break; - case CBQUOTE: /* '`' */ - if (checkkwd & CHKEOFMARK) { - USTPUTC('`', out); - break; - } - - PARSEBACKQOLD(); - break; - case CEOF: - goto endword; /* exit outer loop */ - case CIGN: - break; - default: - if (synstack->varnest == 0) - goto endword; /* exit outer loop */ - if (c != PEOA) { - USTPUTC(c, out); - } - } - c = pgetc_top(synstack); - } - } -endword: - if (synstack->syntax == ARISYNTAX) - synerror("Missing '))'"); - if (synstack->syntax != BASESYNTAX && eofmark == NULL) - synerror("Unterminated quoted string"); - if (synstack->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_eatbnl(); - 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_eatbnl()) { - 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_eatbnl()) == '-') { - 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 { - const char *newsyn = synstack->syntax; - - 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 (!subtype && is_digit(c)); - } else if (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 = '#'; - } - } - - if (!is_special(cc)) { - if (subtype == VSLENGTH) - subtype = 0; - goto badsub; - } - - USTPUTC(cc, out); - } else - goto badsub; - - if (subtype == 0) { - int cc = c; - - 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 '#': - subtype = c == '#' ? VSTRIMLEFT : - VSTRIMRIGHT; - c = pgetc_eatbnl(); - if (c == cc) - subtype++; - else - pungetc(); - - newsyn = BASESYNTAX; - break; - } - } else { -badsub: - pungetc(); - } - - if (newsyn == ARISYNTAX) - newsyn = DQSYNTAX; - - if ((newsyn != synstack->syntax || synstack->innerdq) && - subtype != VSNORMAL) { - synstack_push(&synstack, - synstack->prev ?: - alloca(sizeof(*synstack)), - newsyn); - - synstack->varpushed++; - synstack->dblquote = newsyn != BASESYNTAX; - } - - *((char *)stackblock() + typeloc) = subtype; - if (subtype != VSNORMAL) { - synstack->varnest++; - if (synstack->dblquote) - synstack->dqvarnest++; - } - STPUTC('=', out); - } - goto parsesub_return; -} - - -/* - * Called to parse command substitutions. Newstyle is set if the command - * is enclosed inside $(...); nlpp is a pointer to the head of the linked - * list of commands (passed by reference), and savelen is the number of - * characters on the top of the stack which must be preserved. - */ - -parsebackq: { - struct nodelist **nlpp; - union node *n; - char *str; - size_t savelen; - struct heredoc *saveheredoclist; - int uninitialized_var(saveprompt); - - str = NULL; - savelen = out - (char *)stackblock(); - if (savelen > 0) { - str = alloca(savelen); - memcpy(str, stackblock(), savelen); - } - if (oldstyle) { - /* We must read until the closing backquote, giving special - treatment to some slashes, and then push the string and - reread it as input, interpreting it normally. */ - char *pout; - int pc; - size_t psavelen; - char *pstr; - - - STARTSTACKSTR(pout); - for (;;) { - if (needprompt) { - setprompt(2); - } - switch (pc = pgetc_eatbnl()) { - case '`': - goto done; - - case '\\': - pc = pgetc(); - if (pc != '\\' && pc != '`' && pc != '$' - && (!synstack->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; - - saveheredoclist = heredoclist; - heredoclist = NULL; - - if (oldstyle) { - saveprompt = doprompt; - doprompt = 0; - } - - n = list(2); - - if (oldstyle) - doprompt = saveprompt; - else { - if (readtoken() != TRP) - synexpect(TRP); - setinputstring(nullstr); - } - - parseheredoc(); - heredoclist = saveheredoclist; - - (*nlpp)->n = n; - /* Start reading from old file again. */ - popfile(); - /* Ignore any pushed back tokens left from the backquote parsing. */ - if (oldstyle) - tokpushback = 0; - out = growstackto(savelen + 1); - 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: { - - synstack_push(&synstack, - synstack->prev ?: alloca(sizeof(*synstack)), - ARISYNTAX); - synstack->dblquote = 1; - 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 */ -} - -const char * -expandstr(const char *ps) -{ - struct parsefile *file_stop; - struct jmploc *volatile savehandler; - struct heredoc *saveheredoclist; - const char *result; - int saveprompt; - struct jmploc jmploc; - union node n; - int err; - - file_stop = parsefile; - - /* XXX Fix (char *) cast. */ - setinputstring((char *)ps); - - saveheredoclist = heredoclist; - heredoclist = NULL; - saveprompt = doprompt; - doprompt = 0; - result = ps; - savehandler = handler; - if (unlikely(err = setjmp(jmploc.loc))) - goto out; - handler = &jmploc; - - readtoken1(pgetc_eatbnl(), DQSYNTAX, FAKEEOFMARK, 0); - - n.narg.type = NARG; - n.narg.next = NULL; - n.narg.text = wordtext; - n.narg.backquote = backquotelist; - - expandarg(&n, NULL, EXP_QUOTED); - result = stackblock(); - -out: - handler = savehandler; - if (err && exception != EXERROR) - longjmp(handler->loc, 1); - - doprompt = saveprompt; - unwindfiles(file_stop); - heredoclist = saveheredoclist; - - return result; -} - -STATIC void -setprompt(int which) -{ - struct stackmark smark; - const char *prompt, *rprompt, *nl; - int show; - - needprompt = 0; - whichprompt = which; - - switch (whichprompt) { - default: -#ifdef DEBUG - prompt = "<internal prompt error>"; - rprompt = prompt; - break; -#endif - case 0: - prompt = nullstr; - rprompt = nullstr; - break; - case 1: - prompt = ps1val(); - rprompt = rps1val(); - break; - case 2: - prompt = ps2val(); - rprompt = rps2val(); - break; - } - -#ifdef SMALL - show = 1; -#else - show = !el; -#endif - pushstackmark(&smark, stackblocksize()); - if (show) { - out2str(expandstr(prompt)); - } else { - free(promptcache); - free(rpromptcache); - promptcache = savestr(expandstr(prompt)); - rpromptcache = savestr(expandstr(rprompt)); - - nl = strrchr(promptcache, '\n'); - if (nl) - outmem(promptcache, &nl[1] - promptcache, out2); - } - popstackmark(&smark); -} - -/* - * called by editline -- return the cached prompt expansion. - */ -const char * -getprompt(void *unused) -{ - const char *nl; - - nl = strrchr(promptcache, '\n'); - - if (nl) - return &nl[1]; - else - return promptcache; -} - -const char * -getrprompt(void *unused) -{ - return rpromptcache; -} - -const char *const * -findkwd(const char *s) -{ - return findstring( - s, parsekwd, sizeof(parsekwd) / sizeof(const char *) - ); -} |