/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1997-2005 * Herbert Xu . 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. */ #include #include #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" #ifndef SMALL #include "myhistedit.h" #endif /* * Shell command parser. */ #define EOFMARKLEN 79 /* values returned by readtoken */ #include "token.h" 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 */ MKINIT 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 */ int startlinno; /* line # where last token started */ 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 int noexpand(char *); 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 == '='; } /* * 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) { int t; tokpushback = 0; doprompt = interact; if (doprompt) setprompt(doprompt); needprompt = 0; t = readtoken(); if (t == TEOF) return NEOF; if (t == TNL) return NULL; tokpushback++; return list(1); } STATIC union node * list(int nlflag) { union node *n1, *n2, *n3; int tok; checkkwd = CHKNL | CHKKWD | CHKALIAS; if (nlflag == 2 && tokendlist[peektoken()]) return NULL; n1 = NULL; for (;;) { 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 TBACKGND: case TSEMI: tok = readtoken(); /* fall through */ case TNL: if (tok == TNL) { parseheredoc(); if (nlflag == 1) return n1; } else { tokpushback++; } checkkwd = CHKNL | CHKKWD | CHKALIAS; if (tokendlist[peektoken()]) return n1; break; case TEOF: if (heredoclist) parseheredoc(); else pungetc(); /* push back EOF on input */ return n1; 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; redir = NULL; rpp2 = &redir; 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.var = wordtext; checkkwd = 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 != TNL && 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; 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; do { checkkwd = CHKKWD | CHKALIAS; } while (readtoken() == TNL); if (lasttoken != 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.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.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; args = NULL; app = &args; vars = NULL; vpp = &vars; redir = NULL; rpp = &redir; savecheckkwd = CHKALIAS; 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->narg.next = 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.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 (readtoken() != TWORD) synexpect(-1); if (n->type == NHERE) { struct heredoc *here = heredoc; struct heredoc *p; int i; if (quoteflag == 0) n->type = NXHERE; TRACE(("Here document %d\n", n->type)); if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) synerror("Illegal eof marker for << redirection"); 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; #ifdef DEBUG int alreadyseen = tokpushback; #endif top: t = xxreadtoken(); /* * eat newlines */ if (checkkwd & CHKNL) { while (t == TNL) { parseheredoc(); t = xxreadtoken(); } } if (t != TWORD || quoteflag) { goto out; } /* * check for keywords */ if (checkkwd & 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); } /* * 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. * In all cases, the variable startlinno is set to the number of the line * on which the token starts. * * [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); } startlinno = plinno; for (;;) { /* until token or start of word found */ c = pgetc_macro(); switch (c) { case ' ': case '\t': case PEOA: continue; case '#': while ((c = pgetc()) != '\n' && c != PEOF); pungetc(); continue; case '\\': if (pgetc() == '\n') { startlinno = ++plinno; if (doprompt) setprompt(2); continue; } pungetc(); goto breakloop; case '\n': plinno++; needprompt = doprompt; 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 } /* * 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; int len; char line[EOFMARKLEN + 1]; 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; char const *prevsyntax = NULL; /* syntax before arithmetic */ startlinno = plinno; 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); plinno++; if (doprompt) setprompt(2); 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; case CBACK: /* backslash */ c = pgetc2(); if (c == PEOF) { USTPUTC(CTLESC, out); USTPUTC('\\', out); pungetc(); } else if (c == '\n') { if (doprompt) setprompt(2); } else { if ( dblquote && c != '\\' && c != '`' && c != '$' && ( c != '"' || eofmark != NULL ) ) { USTPUTC(CTLESC, out); USTPUTC('\\', out); } if (SQSYNTAX[c] == CCTL) USTPUTC(CTLESC, out); USTPUTC(c, out); quotef++; } break; case CSQUOTE: syntax = SQSYNTAX; quotemark: if (eofmark == NULL) { USTPUTC(CTLQUOTEMARK, out); } break; case CDQUOTE: syntax = DQSYNTAX; dblquote = 1; goto quotemark; case CENDQUOTE: if (eofmark != NULL && arinest == 0 && varnest == 0) { USTPUTC(c, out); } else { if (dqvarnest == 0) { syntax = BASESYNTAX; dblquote = 0; } quotef++; goto quotemark; } break; case CVAR: /* '$' */ 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() == ')') { if (--arinest == 0) { USTPUTC(CTLENDARI, out); syntax = prevsyntax; if (syntax == DQSYNTAX) dblquote = 1; else dblquote = 0; } else USTPUTC(')', out); } 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_macro(); } } endword: if (syntax == ARISYNTAX) synerror("Missing '))'"); if (syntax != BASESYNTAX && eofmark == NULL) synerror("Unterminated quoted string"); if (varnest != 0) { startlinno = plinno; /* { */ 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 (eofmark) { if (c == PEOA) { c = pgetc2(); } if (striptabs) { while (c == '\t') { c = pgetc2(); } } if (c == *eofmark) { if (pfgets(line, sizeof line) != NULL) { char *p, *q; p = line; for (q = eofmark + 1 ; *q && *p == *q ; p++, q++); if (*p == '\n' && *q == '\0') { c = PEOF; plinno++; needprompt = doprompt; } else { pushstring(line, NULL); } } } } 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; int flags; char *p; static const char types[] = "}-+?="; c = pgetc(); if ( c <= PEOA || (c != '(' && c != '{' && !is_name(c) && !is_special(c)) ) { USTPUTC('$', out); pungetc(); } else if (c == '(') { /* $(command) or $((arith)) */ if (pgetc() == '(') { PARSEARITH(); } else { pungetc(); PARSEBACKQNEW(); } } else { USTPUTC(CTLVAR, out); typeloc = out - (char *)stackblock(); USTPUTC(VSNORMAL, out); subtype = VSNORMAL; if (c == '{') { c = pgetc(); if (c == '#') { if ((c = pgetc()) == '}') c = '#'; else subtype = VSLENGTH; } else subtype = 0; } if (c > PEOA && is_name(c)) { do { STPUTC(c, out); c = pgetc(); } while (c > PEOA && is_in_name(c)); } else if (is_digit(c)) { do { STPUTC(c, out); c = pgetc(); } while (is_digit(c)); } else if (is_special(c)) { USTPUTC(c, out); c = pgetc(); } else badsub: synerror("Bad substitution"); STPUTC('=', out); flags = 0; if (subtype == 0) { switch (c) { case ':': flags = VSNUL; c = pgetc(); /*FALLTHROUGH*/ default: p = strchr(types, c); if (p == NULL) goto badsub; subtype = p - types + VSNORMAL; break; case '%': case '#': { int cc = c; subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT; c = pgetc(); if (c == cc) subtype++; else pungetc(); break; } } } else { pungetc(); } if (dblquote || arinest) flags |= VSQUOTE; *((char *)stackblock() + typeloc) = subtype | flags; if (subtype != VSNORMAL) { varnest++; if (dblquote || arinest) { dqvarnest++; } } } goto parsesub_return; } /* * Called to parse command substitutions. Newstyle is set if the command * is enclosed inside $(...); nlpp is a pointer to the head of the linked * list of commands (passed by reference), and savelen is the number of * characters on the top of the stack which must be preserved. */ parsebackq: { struct nodelist **nlpp; union node *n; char *str; size_t savelen; int saveprompt = 0; str = NULL; savelen = out - (char *)stackblock(); if (savelen > 0) { str = alloca(savelen); memcpy(str, stackblock(), savelen); } if (oldstyle) { /* We must read until the closing backquote, giving special treatment to some slashes, and then push the string and reread it as input, interpreting it normally. */ char *pout; int pc; size_t psavelen; char *pstr; STARTSTACKSTR(pout); for (;;) { if (needprompt) { setprompt(2); } switch (pc = pgetc()) { case '`': goto done; case '\\': if ((pc = pgetc()) == '\n') { plinno++; if (doprompt) setprompt(2); /* * If eating a newline, avoid putting * the newline into the new character * stream (via the STPUTC after the * switch). */ continue; } if (pc != '\\' && pc != '`' && pc != '$' && (!dblquote || pc != '"')) STPUTC('\\', pout); if (pc > PEOA) { break; } /* fall through */ case PEOF: case PEOA: startlinno = plinno; synerror("EOF in backquote substitution"); case '\n': plinno++; needprompt = doprompt; 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); } if (arinest || dblquote) USTPUTC(CTLBACKQ | CTLQUOTE, out); else 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); if (dblquote) USTPUTC('"',out); else USTPUTC(' ',out); } else { /* * we collapse embedded arithmetic expansion to * parenthesis, which should be equivalent */ USTPUTC('(', out); } goto parsearith_return; } } /* end of readtoken */ #ifdef mkinit INCLUDE "parser.h" RESET { tokpushback = 0; checkkwd = 0; } #endif /* * Returns true if the text contains nothing to expand (no dollar signs * or backquotes). */ STATIC int noexpand(char *text) { char *p; signed char c; p = text; while ((c = *p++) != '\0') { if (c == CTLQUOTEMARK) continue; if (c == CTLESC) p++; else if (BASESYNTAX[(int)c] == CCTL) return 0; } return 1; } /* * 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) { 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) { setstackmark(&smark); stalloc(stackblocksize()); out2str(getprompt(NULL)); popstackmark(&smark); } } const char * expandstr(const char *ps) { union node n; /* XXX Fix (char *) cast. */ setinputstring((char *)ps); readtoken1(pgetc(), DQSYNTAX, nullstr, 0); popfile(); n.narg.type = NARG; n.narg.next = NULL; n.narg.text = wordtext; n.narg.backquote = backquotelist; expandarg(&n, NULL, 0); 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 ""; #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 *) ); }