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Diffstat (limited to 'bin/1sh/parser.c')
| -rw-r--r-- | bin/1sh/parser.c | 2182 |
1 files changed, 0 insertions, 2182 deletions
diff --git a/bin/1sh/parser.c b/bin/1sh/parser.c deleted file mode 100644 index a7b86aab..00000000 --- a/bin/1sh/parser.c +++ /dev/null @@ -1,2182 +0,0 @@ -/*- - * SPDX-License-Identifier: BSD-3-Clause - * - * Copyright (c) 1991, 1993 - * The Regents of the University of California. 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. - */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)parser.c 8.7 (Berkeley) 5/16/95"; -#endif -#endif /* not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD: releng/12.0/bin/sh/parser.c 334008 2018-05-21 21:52:48Z jilles $"); - -#include <stdlib.h> -#include <unistd.h> -#include <stdio.h> - -#include "shell.h" -#include "parser.h" -#include "nodes.h" -#include "expand.h" /* defines rmescapes() */ -#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 "eval.h" -#include "exec.h" /* to check for special builtins */ -#ifndef NO_HISTORY -#include "myhistedit.h" -#endif - -/* - * Shell command parser. - */ - -#define PROMPTLEN 128 - -/* values of checkkwd variable */ -#define CHKALIAS 0x1 -#define CHKKWD 0x2 -#define CHKNL 0x4 - -/* 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 parser_temp { - struct parser_temp *next; - void *data; -}; - - -static struct heredoc *heredoclist; /* list of here documents to read */ -static int doprompt; /* if set, prompt the user */ -static int needprompt; /* true if interactive and at start of line */ -static int lasttoken; /* last token read */ -static int tokpushback; /* last token pushed back */ -static char *wordtext; /* text of last word returned by readtoken */ -static int checkkwd; -static struct nodelist *backquotelist; -static union node *redirnode; -static struct heredoc *heredoc; -static int quoteflag; /* set if (part of) last token was quoted */ -static int startlinno; /* line # where last token started */ -static int funclinno; /* line # where the current function started */ -static struct parser_temp *parser_temp; - -#define NOEOFMARK ((const char *)&heredoclist) - - -static union node *list(int); -static union node *andor(void); -static union node *pipeline(void); -static union node *command(void); -static union node *simplecmd(union node **, union node *); -static union node *makename(void); -static union node *makebinary(int type, union node *n1, union node *n2); -static void parsefname(void); -static void parseheredoc(void); -static int peektoken(void); -static int readtoken(void); -static int xxreadtoken(void); -static int readtoken1(int, const char *, const char *, int); -static int noexpand(char *); -static void consumetoken(int); -static void synexpect(int) __dead2; -static void synerror(const char *) __dead2; -static void setprompt(int); -static char *expandprompt(const char *); -static int pgetc_linecont(void); - - -static void * -parser_temp_alloc(size_t len) -{ - struct parser_temp *t; - - INTOFF; - t = ckmalloc(sizeof(*t)); - t->data = NULL; - t->next = parser_temp; - parser_temp = t; - t->data = ckmalloc(len); - INTON; - return t->data; -} - - -static void * -parser_temp_realloc(void *ptr, size_t len) -{ - struct parser_temp *t; - - INTOFF; - t = parser_temp; - if (ptr != t->data) - error("bug: parser_temp_realloc misused"); - t->data = ckrealloc(t->data, len); - INTON; - return t->data; -} - - -static void -parser_temp_free_upto(void *ptr) -{ - struct parser_temp *t; - int done = 0; - - INTOFF; - while (parser_temp != NULL && !done) { - t = parser_temp; - parser_temp = t->next; - done = t->data == ptr; - ckfree(t->data); - ckfree(t); - } - INTON; - if (!done) - error("bug: parser_temp_free_upto misused"); -} - - -static void -parser_temp_free_all(void) -{ - struct parser_temp *t; - - INTOFF; - while (parser_temp != NULL) { - t = parser_temp; - parser_temp = t->next; - ckfree(t->data); - ckfree(t); - } - INTON; -} - - -/* - * 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; - - /* This assumes the parser is not re-entered, - * which could happen if we add command substitution on PS1/PS2. - */ - parser_temp_free_all(); - heredoclist = NULL; - - tokpushback = 0; - checkkwd = 0; - doprompt = interact; - if (doprompt) - setprompt(1); - else - setprompt(0); - needprompt = 0; - t = readtoken(); - if (t == TEOF) - return NEOF; - if (t == TNL) - return NULL; - tokpushback++; - return list(1); -} - - -/* - * Read and parse words for wordexp. - * Returns a list of NARG nodes; NULL if there are no words. - */ -union node * -parsewordexp(void) -{ - union node *n, *first = NULL, **pnext; - int t; - - /* This assumes the parser is not re-entered, - * which could happen if we add command substitution on PS1/PS2. - */ - parser_temp_free_all(); - heredoclist = NULL; - - tokpushback = 0; - checkkwd = 0; - doprompt = 0; - setprompt(0); - needprompt = 0; - pnext = &first; - while ((t = readtoken()) != TEOF) { - if (t != TWORD) - synexpect(TWORD); - n = makename(); - *pnext = n; - pnext = &n->narg.next; - } - return first; -} - - -static union node * -list(int nlflag) -{ - union node *ntop, *n1, *n2, *n3; - int tok; - - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if (!nlflag && tokendlist[peektoken()]) - return NULL; - ntop = n1 = NULL; - for (;;) { - n2 = andor(); - tok = readtoken(); - if (tok == TBACKGND) { - if (n2 != NULL && n2->type == NPIPE) { - n2->npipe.backgnd = 1; - } else if (n2 != NULL && n2->type == NREDIR) { - n2->type = NBACKGND; - } else { - n3 = (union node *)stalloc(sizeof (struct nredir)); - n3->type = NBACKGND; - n3->nredir.n = n2; - n3->nredir.redirect = NULL; - n2 = n3; - } - } - if (ntop == NULL) - ntop = n2; - else if (n1 == NULL) { - n1 = makebinary(NSEMI, ntop, n2); - ntop = n1; - } - else { - n3 = makebinary(NSEMI, n1->nbinary.ch2, n2); - n1->nbinary.ch2 = n3; - n1 = n3; - } - switch (tok) { - case TBACKGND: - case TSEMI: - tok = readtoken(); - /* FALLTHROUGH */ - case TNL: - if (tok == TNL) { - parseheredoc(); - if (nlflag) - return ntop; - } else if (tok == TEOF && nlflag) { - parseheredoc(); - return ntop; - } else { - tokpushback++; - } - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if (!nlflag && tokendlist[peektoken()]) - return ntop; - break; - case TEOF: - if (heredoclist) - parseheredoc(); - else - pungetc(); /* push back EOF on input */ - return ntop; - default: - if (nlflag) - synexpect(-1); - tokpushback++; - return ntop; - } - } -} - - - -static union node * -andor(void) -{ - union node *n; - int t; - - n = pipeline(); - for (;;) { - if ((t = readtoken()) == TAND) { - t = NAND; - } else if (t == TOR) { - t = NOR; - } else { - tokpushback++; - return n; - } - n = makebinary(t, n, pipeline()); - } -} - - - -static union node * -pipeline(void) -{ - union node *n1, *n2, *pipenode; - struct nodelist *lp, *prev; - int negate, t; - - negate = 0; - checkkwd = CHKNL | CHKKWD | CHKALIAS; - TRACE(("pipeline: entered\n")); - while (readtoken() == TNOT) - negate = !negate; - 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; - t = readtoken(); - tokpushback++; - if (t == TNOT) - lp->n = pipeline(); - else - 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; - int t; - int is_subshell; - - checkkwd = CHKNL | CHKKWD | CHKALIAS; - is_subshell = 0; - redir = NULL; - n1 = NULL; - rpp = &redir; - - /* Check for redirection which may precede command */ - while (readtoken() == TREDIR) { - *rpp = n2 = redirnode; - rpp = &n2->nfile.next; - parsefname(); - } - tokpushback++; - - switch (readtoken()) { - case TIF: - n1 = (union node *)stalloc(sizeof (struct nif)); - n1->type = NIF; - if ((n1->nif.test = list(0)) == NULL) - synexpect(-1); - consumetoken(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; - if ((n2->nif.test = list(0)) == NULL) - synexpect(-1); - consumetoken(TTHEN); - n2->nif.ifpart = list(0); - } - if (lasttoken == TELSE) - n2->nif.elsepart = list(0); - else { - n2->nif.elsepart = NULL; - tokpushback++; - } - consumetoken(TFI); - checkkwd = CHKKWD | CHKALIAS; - break; - case TWHILE: - case TUNTIL: - t = lasttoken; - if ((n1 = list(0)) == NULL) - synexpect(-1); - consumetoken(TDO); - n1 = makebinary((t == TWHILE)? NWHILE : NUNTIL, n1, list(0)); - consumetoken(TDONE); - checkkwd = CHKKWD | CHKALIAS; - 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; - while (readtoken() == TNL) - ; - if (lasttoken == TWORD && ! quoteflag && equal(wordtext, "in")) { - app = ≈ - while (readtoken() == TWORD) { - n2 = makename(); - *app = n2; - app = &n2->narg.next; - } - *app = NULL; - n1->nfor.args = ap; - if (lasttoken != TNL && lasttoken != TSEMI) - synexpect(-1); - } else { - static char argvars[5] = { - CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' - }; - n2 = (union node *)stalloc(sizeof (struct narg)); - n2->type = NARG; - n2->narg.text = argvars; - 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 ((t = readtoken()) == TDO) - t = TDONE; - else if (t == TBEGIN) - t = TEND; - else - synexpect(-1); - n1->nfor.body = list(0); - consumetoken(t); - checkkwd = CHKKWD | CHKALIAS; - break; - case TCASE: - n1 = (union node *)stalloc(sizeof (struct ncase)); - n1->type = NCASE; - consumetoken(TWORD); - n1->ncase.expr = makename(); - while (readtoken() == TNL); - if (lasttoken != TWORD || ! equal(wordtext, "in")) - synerror("expecting \"in\""); - cpp = &n1->ncase.cases; - checkkwd = CHKNL | CHKKWD, readtoken(); - while (lasttoken != TESAC) { - *cpp = cp = (union node *)stalloc(sizeof (struct nclist)); - cp->type = NCLIST; - app = &cp->nclist.pattern; - if (lasttoken == TLP) - readtoken(); - for (;;) { - *app = ap = makename(); - checkkwd = CHKNL | CHKKWD; - if (readtoken() != TPIPE) - break; - app = &ap->narg.next; - readtoken(); - } - ap->narg.next = NULL; - if (lasttoken != TRP) - synexpect(TRP); - cp->nclist.body = list(0); - - checkkwd = CHKNL | CHKKWD | CHKALIAS; - if ((t = readtoken()) != TESAC) { - if (t == TENDCASE) - ; - else if (t == TFALLTHRU) - cp->type = NCLISTFALLTHRU; - else - synexpect(TENDCASE); - checkkwd = CHKNL | CHKKWD, readtoken(); - } - cpp = &cp->nclist.next; - } - *cpp = NULL; - checkkwd = CHKKWD | CHKALIAS; - break; - case TLP: - n1 = (union node *)stalloc(sizeof (struct nredir)); - n1->type = NSUBSHELL; - n1->nredir.n = list(0); - n1->nredir.redirect = NULL; - consumetoken(TRP); - checkkwd = CHKKWD | CHKALIAS; - is_subshell = 1; - break; - case TBEGIN: - n1 = list(0); - consumetoken(TEND); - checkkwd = CHKKWD | CHKALIAS; - break; - /* A simple command must have at least one redirection or word. */ - case TBACKGND: - case TSEMI: - case TAND: - case TOR: - case TPIPE: - case TENDCASE: - case TFALLTHRU: - case TEOF: - case TNL: - case TRP: - if (!redir) - synexpect(-1); - case TWORD: - tokpushback++; - n1 = simplecmd(rpp, redir); - return n1; - default: - synexpect(-1); - } - - /* Now check for redirection which may follow command */ - while (readtoken() == TREDIR) { - *rpp = n2 = redirnode; - rpp = &n2->nfile.next; - parsefname(); - } - tokpushback++; - *rpp = NULL; - if (redir) { - if (!is_subshell) { - 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(union node **rpp, union node *redir) -{ - union node *args, **app; - union node **orig_rpp = rpp; - union node *n = NULL; - int special; - int savecheckkwd; - - /* If we don't have any redirections already, then we must reset */ - /* rpp to be the address of the local redir variable. */ - if (redir == NULL) - rpp = &redir; - - args = NULL; - app = &args; - /* - * We save the incoming value, because we need this for shell - * functions. There can not be a redirect or an argument between - * the function name and the open parenthesis. - */ - orig_rpp = rpp; - - savecheckkwd = CHKALIAS; - - for (;;) { - checkkwd = savecheckkwd; - if (readtoken() == TWORD) { - n = makename(); - *app = n; - app = &n->narg.next; - if (savecheckkwd != 0 && !isassignment(wordtext)) - savecheckkwd = 0; - } else if (lasttoken == TREDIR) { - *rpp = n = redirnode; - rpp = &n->nfile.next; - parsefname(); /* read name of redirection file */ - } else if (lasttoken == TLP && app == &args->narg.next - && rpp == orig_rpp) { - /* We have a function */ - consumetoken(TRP); - funclinno = plinno; - /* - * - Require plain text. - * - Functions with '/' cannot be called. - * - Reject name=(). - * - Reject ksh extended glob patterns. - */ - if (!noexpand(n->narg.text) || quoteflag || - strchr(n->narg.text, '/') || - strchr("!%*+-=?@}~", - n->narg.text[strlen(n->narg.text) - 1])) - synerror("Bad function name"); - rmescapes(n->narg.text); - if (find_builtin(n->narg.text, &special) >= 0 && - special) - synerror("Cannot override a special builtin with a function"); - n->type = NDEFUN; - n->narg.next = command(); - funclinno = 0; - return n; - } else { - tokpushback++; - break; - } - } - *app = NULL; - *rpp = NULL; - n = (union node *)stalloc(sizeof (struct ncmd)); - n->type = NCMD; - n->ncmd.args = args; - 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; -} - -static union node * -makebinary(int type, union node *n1, union node *n2) -{ - union node *n; - - n = (union node *)stalloc(sizeof (struct nbinary)); - n->type = type; - n->nbinary.ch1 = n1; - n->nbinary.ch2 = n2; - return (n); -} - -void -forcealias(void) -{ - checkkwd |= CHKALIAS; -} - -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; - - consumetoken(TWORD); - if (n->type == NHERE) { - struct heredoc *here = heredoc; - struct heredoc *p; - - if (quoteflag == 0) - n->type = NXHERE; - TRACE(("Here document %d\n", n->type)); - if (here->striptabs) { - while (*wordtext == '\t') - wordtext++; - } - if (! noexpand(wordtext)) - 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; - - while (heredoclist) { - here = heredoclist; - heredoclist = here->next; - if (needprompt) { - setprompt(2); - needprompt = 0; - } - readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX, - here->eofmark, here->striptabs); - n = makename(); - here->here->nhere.doc = n; - } -} - -static int -peektoken(void) -{ - int t; - - t = readtoken(); - tokpushback++; - return (t); -} - -static int -readtoken(void) -{ - int t; - struct alias *ap; -#ifdef DEBUG - int alreadyseen = tokpushback; -#endif - - top: - t = xxreadtoken(); - - /* - * eat newlines - */ - if (checkkwd & CHKNL) { - while (t == TNL) { - parseheredoc(); - t = xxreadtoken(); - } - } - - /* - * check for keywords and aliases - */ - if (t == TWORD && !quoteflag) - { - const char * const *pp; - - if (checkkwd & CHKKWD) - for (pp = parsekwd; *pp; pp++) { - if (**pp == *wordtext && equal(*pp, wordtext)) - { - lasttoken = t = pp - parsekwd + KWDOFFSET; - TRACE(("keyword %s recognized\n", tokname[t])); - goto out; - } - } - if (checkkwd & CHKALIAS && - (ap = lookupalias(wordtext, 1)) != NULL) { - pushstring(ap->val, strlen(ap->val), ap); - goto top; - } - } -out: - if (t != TNOT) - 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); - needprompt = 0; - } - startlinno = plinno; - for (;;) { /* until token or start of word found */ - c = pgetc_macro(); - switch (c) { - case ' ': case '\t': - continue; - case '#': - while ((c = pgetc()) != '\n' && c != PEOF); - pungetc(); - continue; - case '\\': - if (pgetc() == '\n') { - startlinno = ++plinno; - if (doprompt) - setprompt(2); - else - setprompt(0); - continue; - } - pungetc(); - /* FALLTHROUGH */ - default: - return readtoken1(c, BASESYNTAX, (char *)NULL, 0); - case '\n': - plinno++; - needprompt = doprompt; - RETURN(TNL); - case PEOF: - RETURN(TEOF); - case '&': - if (pgetc_linecont() == '&') - RETURN(TAND); - pungetc(); - RETURN(TBACKGND); - case '|': - if (pgetc_linecont() == '|') - RETURN(TOR); - pungetc(); - RETURN(TPIPE); - case ';': - c = pgetc_linecont(); - if (c == ';') - RETURN(TENDCASE); - else if (c == '&') - RETURN(TFALLTHRU); - pungetc(); - RETURN(TSEMI); - case '(': - RETURN(TLP); - case ')': - RETURN(TRP); - } - } -#undef RETURN -} - - -#define MAXNEST_static 8 -struct tokenstate -{ - const char *syntax; /* *SYNTAX */ - int parenlevel; /* levels of parentheses in arithmetic */ - enum tokenstate_category - { - TSTATE_TOP, - TSTATE_VAR_OLD, /* ${var+-=?}, inherits dquotes */ - TSTATE_VAR_NEW, /* other ${var...}, own dquote state */ - TSTATE_ARITH - } category; -}; - - -/* - * 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. - * The new value of c is returned. - */ - -static int -checkend(int c, const char *eofmark, int striptabs) -{ - if (striptabs) { - while (c == '\t') - c = pgetc(); - } - if (c == *eofmark) { - int c2; - const char *q; - - for (q = eofmark + 1; c2 = pgetc(), *q != '\0' && c2 == *q; q++) - ; - if ((c2 == PEOF || c2 == '\n') && *q == '\0') { - c = PEOF; - if (c2 == '\n') { - plinno++; - needprompt = doprompt; - } - } else { - pungetc(); - pushstring(eofmark + 1, q - (eofmark + 1), NULL); - } - } else if (c == '\n' && *eofmark == '\0') { - c = PEOF; - plinno++; - needprompt = doprompt; - } - return (c); -} - - -/* - * 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. - */ - -static void -parseredir(char *out, int c) -{ - char fd = *out; - union node *np; - - np = (union node *)stalloc(sizeof (struct nfile)); - if (c == '>') { - np->nfile.fd = 1; - c = pgetc_linecont(); - if (c == '>') - np->type = NAPPEND; - else if (c == '&') - np->type = NTOFD; - else if (c == '|') - np->type = NCLOBBER; - else { - np->type = NTO; - pungetc(); - } - } else { /* c == '<' */ - np->nfile.fd = 0; - c = pgetc_linecont(); - if (c == '<') { - 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_linecont()) == '-') { - heredoc->striptabs = 1; - } else { - heredoc->striptabs = 0; - pungetc(); - } - } else if (c == '&') - np->type = NFROMFD; - else if (c == '>') - np->type = NFROMTO; - else { - np->type = NFROM; - pungetc(); - } - } - if (fd != '\0') - np->nfile.fd = digit_val(fd); - redirnode = np; -} - -/* - * Called to parse command substitutions. - */ - -static char * -parsebackq(char *out, struct nodelist **pbqlist, - int oldstyle, int dblquote, int quoted) -{ - struct nodelist **nlpp; - union node *n; - char *volatile str; - struct jmploc jmploc; - struct jmploc *const savehandler = handler; - size_t savelen; - int saveprompt; - const int bq_startlinno = plinno; - char *volatile ostr = NULL; - struct parsefile *const savetopfile = getcurrentfile(); - struct heredoc *const saveheredoclist = heredoclist; - struct heredoc *here; - - str = NULL; - if (setjmp(jmploc.loc)) { - popfilesupto(savetopfile); - if (str) - ckfree(str); - if (ostr) - ckfree(ostr); - heredoclist = saveheredoclist; - handler = savehandler; - if (exception == EXERROR) { - startlinno = bq_startlinno; - synerror("Error in command substitution"); - } - longjmp(handler->loc, 1); - } - INTOFF; - savelen = out - stackblock(); - if (savelen > 0) { - str = ckmalloc(savelen); - memcpy(str, stackblock(), savelen); - } - handler = &jmploc; - heredoclist = NULL; - INTON; - 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 *oout; - int c; - int olen; - - - STARTSTACKSTR(oout); - for (;;) { - if (needprompt) { - setprompt(2); - needprompt = 0; - } - CHECKSTRSPACE(2, oout); - c = pgetc_linecont(); - if (c == '`') - break; - switch (c) { - case '\\': - c = pgetc(); - if (c != '\\' && c != '`' && c != '$' - && (!dblquote || c != '"')) - USTPUTC('\\', oout); - break; - - case '\n': - plinno++; - needprompt = doprompt; - break; - - case PEOF: - startlinno = plinno; - synerror("EOF in backquote substitution"); - break; - - default: - break; - } - USTPUTC(c, oout); - } - USTPUTC('\0', oout); - olen = oout - stackblock(); - INTOFF; - ostr = ckmalloc(olen); - memcpy(ostr, stackblock(), olen); - setinputstring(ostr, 1); - INTON; - } - nlpp = pbqlist; - while (*nlpp) - nlpp = &(*nlpp)->next; - *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist)); - (*nlpp)->next = NULL; - - if (oldstyle) { - saveprompt = doprompt; - doprompt = 0; - } - - n = list(0); - - if (oldstyle) { - if (peektoken() != TEOF) - synexpect(-1); - doprompt = saveprompt; - } else - consumetoken(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; - } - STARTSTACKSTR(out); - CHECKSTRSPACE(savelen + 1, out); - INTOFF; - if (str) { - memcpy(out, str, savelen); - STADJUST(savelen, out); - ckfree(str); - str = NULL; - } - if (ostr) { - ckfree(ostr); - ostr = NULL; - } - here = saveheredoclist; - if (here != NULL) { - while (here->next != NULL) - here = here->next; - here->next = heredoclist; - heredoclist = saveheredoclist; - } - handler = savehandler; - INTON; - if (quoted) - USTPUTC(CTLBACKQ | CTLQUOTE, out); - else - USTPUTC(CTLBACKQ, out); - return out; -} - - -/* - * Called to parse a backslash escape sequence inside $'...'. - * The backslash has already been read. - */ -static char * -readcstyleesc(char *out) -{ - int c, vc, i, n; - unsigned int v; - - c = pgetc(); - switch (c) { - case '\0': - synerror("Unterminated quoted string"); - case '\n': - plinno++; - if (doprompt) - setprompt(2); - else - setprompt(0); - return out; - case '\\': - case '\'': - case '"': - v = c; - break; - case 'a': v = '\a'; break; - case 'b': v = '\b'; break; - case 'e': v = '\033'; break; - case 'f': v = '\f'; break; - case 'n': v = '\n'; break; - case 'r': v = '\r'; break; - case 't': v = '\t'; break; - case 'v': v = '\v'; break; - case 'x': - v = 0; - for (;;) { - c = pgetc(); - if (c >= '0' && c <= '9') - v = (v << 4) + c - '0'; - else if (c >= 'A' && c <= 'F') - v = (v << 4) + c - 'A' + 10; - else if (c >= 'a' && c <= 'f') - v = (v << 4) + c - 'a' + 10; - else - break; - } - pungetc(); - break; - case '0': case '1': case '2': case '3': - case '4': case '5': case '6': case '7': - v = c - '0'; - c = pgetc(); - if (c >= '0' && c <= '7') { - v <<= 3; - v += c - '0'; - c = pgetc(); - if (c >= '0' && c <= '7') { - v <<= 3; - v += c - '0'; - } else - pungetc(); - } else - pungetc(); - break; - case 'c': - c = pgetc(); - if (c < 0x3f || c > 0x7a || c == 0x60) - synerror("Bad escape sequence"); - if (c == '\\' && pgetc() != '\\') - synerror("Bad escape sequence"); - if (c == '?') - v = 127; - else - v = c & 0x1f; - break; - case 'u': - case 'U': - n = c == 'U' ? 8 : 4; - v = 0; - for (i = 0; i < n; i++) { - c = pgetc(); - if (c >= '0' && c <= '9') - v = (v << 4) + c - '0'; - else if (c >= 'A' && c <= 'F') - v = (v << 4) + c - 'A' + 10; - else if (c >= 'a' && c <= 'f') - v = (v << 4) + c - 'a' + 10; - else - synerror("Bad escape sequence"); - } - if (v == 0 || (v >= 0xd800 && v <= 0xdfff)) - synerror("Bad escape sequence"); - /* We really need iconv here. */ - if (initial_localeisutf8 && v > 127) { - CHECKSTRSPACE(4, out); - /* - * We cannot use wctomb() as the locale may have - * changed. - */ - if (v <= 0x7ff) { - USTPUTC(0xc0 | v >> 6, out); - USTPUTC(0x80 | (v & 0x3f), out); - return out; - } else if (v <= 0xffff) { - USTPUTC(0xe0 | v >> 12, out); - USTPUTC(0x80 | ((v >> 6) & 0x3f), out); - USTPUTC(0x80 | (v & 0x3f), out); - return out; - } else if (v <= 0x10ffff) { - USTPUTC(0xf0 | v >> 18, out); - USTPUTC(0x80 | ((v >> 12) & 0x3f), out); - USTPUTC(0x80 | ((v >> 6) & 0x3f), out); - USTPUTC(0x80 | (v & 0x3f), out); - return out; - } - } - if (v > 127) - v = '?'; - break; - default: - synerror("Bad escape sequence"); - } - vc = (char)v; - /* - * We can't handle NUL bytes. - * POSIX says we should skip till the closing quote. - */ - if (vc == '\0') { - while ((c = pgetc()) != '\'') { - if (c == '\\') - c = pgetc(); - if (c == PEOF) - synerror("Unterminated quoted string"); - if (c == '\n') { - plinno++; - if (doprompt) - setprompt(2); - else - setprompt(0); - } - } - pungetc(); - return out; - } - if (SQSYNTAX[vc] == CCTL) - USTPUTC(CTLESC, out); - USTPUTC(vc, out); - return out; -} - - -/* - * 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 PARSESUB() {goto parsesub; parsesub_return:;} -#define PARSEARITH() {goto parsearith; parsearith_return:;} - -static int -readtoken1(int firstc, char const *initialsyntax, const char *eofmark, - int striptabs) -{ - int c = firstc; - char *out; - int len; - struct nodelist *bqlist; - int quotef; - int newvarnest; - int level; - int synentry; - struct tokenstate state_static[MAXNEST_static]; - int maxnest = MAXNEST_static; - struct tokenstate *state = state_static; - int sqiscstyle = 0; - - startlinno = plinno; - quotef = 0; - bqlist = NULL; - newvarnest = 0; - level = 0; - state[level].syntax = initialsyntax; - state[level].parenlevel = 0; - state[level].category = TSTATE_TOP; - - STARTSTACKSTR(out); - loop: { /* for each line, until end of word */ - if (eofmark && eofmark != NOEOFMARK) - /* set c to PEOF if at end of here document */ - c = checkend(c, eofmark, striptabs); - for (;;) { /* until end of line or end of word */ - CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ - - synentry = state[level].syntax[c]; - - switch(synentry) { - case CNL: /* '\n' */ - if (level == 0) - goto endword; /* exit outer loop */ - /* FALLTHROUGH */ - case CQNL: - USTPUTC(c, out); - plinno++; - if (doprompt) - setprompt(2); - else - setprompt(0); - c = pgetc(); - goto loop; /* continue outer loop */ - case CSBACK: - if (sqiscstyle) { - out = readcstyleesc(out); - break; - } - /* FALLTHROUGH */ - case CWORD: - USTPUTC(c, out); - break; - case CCTL: - if (eofmark == NULL || initialsyntax != SQSYNTAX) - USTPUTC(CTLESC, out); - USTPUTC(c, out); - break; - case CBACK: /* backslash */ - c = pgetc(); - if (c == PEOF) { - USTPUTC('\\', out); - pungetc(); - } else if (c == '\n') { - plinno++; - if (doprompt) - setprompt(2); - else - setprompt(0); - } else { - if (state[level].syntax == DQSYNTAX && - c != '\\' && c != '`' && c != '$' && - (c != '"' || (eofmark != NULL && - newvarnest == 0)) && - (c != '}' || state[level].category != TSTATE_VAR_OLD)) - USTPUTC('\\', out); - if ((eofmark == NULL || - newvarnest > 0) && - state[level].syntax == BASESYNTAX) - USTPUTC(CTLQUOTEMARK, out); - if (SQSYNTAX[c] == CCTL) - USTPUTC(CTLESC, out); - USTPUTC(c, out); - if ((eofmark == NULL || - newvarnest > 0) && - state[level].syntax == BASESYNTAX && - state[level].category == TSTATE_VAR_OLD) - USTPUTC(CTLQUOTEEND, out); - quotef++; - } - break; - case CSQUOTE: - USTPUTC(CTLQUOTEMARK, out); - state[level].syntax = SQSYNTAX; - sqiscstyle = 0; - break; - case CDQUOTE: - USTPUTC(CTLQUOTEMARK, out); - state[level].syntax = DQSYNTAX; - break; - case CENDQUOTE: - if (eofmark != NULL && newvarnest == 0) - USTPUTC(c, out); - else { - if (state[level].category == TSTATE_VAR_OLD) - USTPUTC(CTLQUOTEEND, out); - state[level].syntax = BASESYNTAX; - quotef++; - } - break; - case CVAR: /* '$' */ - PARSESUB(); /* parse substitution */ - break; - case CENDVAR: /* '}' */ - if (level > 0 && - ((state[level].category == TSTATE_VAR_OLD && - state[level].syntax == - state[level - 1].syntax) || - (state[level].category == TSTATE_VAR_NEW && - state[level].syntax == BASESYNTAX))) { - if (state[level].category == TSTATE_VAR_NEW) - newvarnest--; - level--; - USTPUTC(CTLENDVAR, out); - } else { - USTPUTC(c, out); - } - break; - case CLP: /* '(' in arithmetic */ - state[level].parenlevel++; - USTPUTC(c, out); - break; - case CRP: /* ')' in arithmetic */ - if (state[level].parenlevel > 0) { - USTPUTC(c, out); - --state[level].parenlevel; - } else { - if (pgetc_linecont() == ')') { - if (level > 0 && - state[level].category == TSTATE_ARITH) { - level--; - USTPUTC(CTLENDARI, out); - } else - USTPUTC(')', out); - } else { - /* - * unbalanced parens - * (don't 2nd guess - no error) - */ - pungetc(); - USTPUTC(')', out); - } - } - break; - case CBQUOTE: /* '`' */ - out = parsebackq(out, &bqlist, 1, - state[level].syntax == DQSYNTAX && - (eofmark == NULL || newvarnest > 0), - state[level].syntax == DQSYNTAX || state[level].syntax == ARISYNTAX); - break; - case CEOF: - goto endword; /* exit outer loop */ - case CIGN: - break; - default: - if (level == 0) - goto endword; /* exit outer loop */ - USTPUTC(c, out); - } - c = pgetc_macro(); - } - } -endword: - if (state[level].syntax == ARISYNTAX) - synerror("Missing '))'"); - if (state[level].syntax != BASESYNTAX && eofmark == NULL) - synerror("Unterminated quoted string"); - if (state[level].category == TSTATE_VAR_OLD || - state[level].category == TSTATE_VAR_NEW) { - startlinno = plinno; - synerror("Missing '}'"); - } - if (state != state_static) - parser_temp_free_upto(state); - USTPUTC('\0', out); - len = out - stackblock(); - out = stackblock(); - if (eofmark == NULL) { - if ((c == '>' || c == '<') - && quotef == 0 - && len <= 2 - && (*out == '\0' || is_digit(*out))) { - parseredir(out, c); - return lasttoken = TREDIR; - } else { - pungetc(); - } - } - quoteflag = quotef; - backquotelist = bqlist; - grabstackblock(len); - wordtext = out; - return lasttoken = TWORD; -/* end of readtoken routine */ - - -/* - * 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[] = "}-+?="; - int linno; - int length; - int c1; - - c = pgetc_linecont(); - if (c == '(') { /* $(command) or $((arith)) */ - if (pgetc_linecont() == '(') { - PARSEARITH(); - } else { - pungetc(); - out = parsebackq(out, &bqlist, 0, - state[level].syntax == DQSYNTAX && - (eofmark == NULL || newvarnest > 0), - state[level].syntax == DQSYNTAX || - state[level].syntax == ARISYNTAX); - } - } else if (c == '{' || is_name(c) || is_special(c)) { - USTPUTC(CTLVAR, out); - typeloc = out - stackblock(); - USTPUTC(VSNORMAL, out); - subtype = VSNORMAL; - flags = 0; - if (c == '{') { - c = pgetc_linecont(); - subtype = 0; - } -varname: - if (!is_eof(c) && is_name(c)) { - length = 0; - do { - STPUTC(c, out); - c = pgetc_linecont(); - length++; - } while (!is_eof(c) && is_in_name(c)); - if (length == 6 && - strncmp(out - length, "LINENO", length) == 0) { - /* Replace the variable name with the - * current line number. */ - STADJUST(-6, out); - CHECKSTRSPACE(11, out); - linno = plinno; - if (funclinno != 0) - linno -= funclinno - 1; - length = snprintf(out, 11, "%d", linno); - if (length > 10) - length = 10; - out += length; - flags |= VSLINENO; - } - } else if (is_digit(c)) { - if (subtype != VSNORMAL) { - do { - STPUTC(c, out); - c = pgetc_linecont(); - } while (is_digit(c)); - } else { - USTPUTC(c, out); - c = pgetc_linecont(); - } - } else if (is_special(c)) { - c1 = c; - c = pgetc_linecont(); - if (subtype == 0 && c1 == '#') { - subtype = VSLENGTH; - if (strchr(types, c) == NULL && c != ':' && - c != '#' && c != '%') - goto varname; - c1 = c; - c = pgetc_linecont(); - if (c1 != '}' && c == '}') { - pungetc(); - c = c1; - goto varname; - } - pungetc(); - c = c1; - c1 = '#'; - subtype = 0; - } - USTPUTC(c1, out); - } else { - subtype = VSERROR; - if (c == '}') - pungetc(); - else if (c == '\n' || c == PEOF) - synerror("Unexpected end of line in substitution"); - else if (BASESYNTAX[c] != CCTL) - USTPUTC(c, out); - } - if (subtype == 0) { - switch (c) { - case ':': - flags |= VSNUL; - c = pgetc_linecont(); - /*FALLTHROUGH*/ - default: - p = strchr(types, c); - if (p == NULL) { - if (c == '\n' || c == PEOF) - synerror("Unexpected end of line in substitution"); - if (flags == VSNUL) - STPUTC(':', out); - if (BASESYNTAX[c] != CCTL) - STPUTC(c, out); - subtype = VSERROR; - } else - subtype = p - types + VSNORMAL; - break; - case '%': - case '#': - { - int cc = c; - subtype = c == '#' ? VSTRIMLEFT : - VSTRIMRIGHT; - c = pgetc_linecont(); - if (c == cc) - subtype++; - else - pungetc(); - break; - } - } - } else if (subtype != VSERROR) { - if (subtype == VSLENGTH && c != '}') - subtype = VSERROR; - pungetc(); - } - STPUTC('=', out); - if (state[level].syntax == DQSYNTAX || - state[level].syntax == ARISYNTAX) - flags |= VSQUOTE; - *(stackblock() + typeloc) = subtype | flags; - if (subtype != VSNORMAL) { - if (level + 1 >= maxnest) { - maxnest *= 2; - if (state == state_static) { - state = parser_temp_alloc( - maxnest * sizeof(*state)); - memcpy(state, state_static, - MAXNEST_static * sizeof(*state)); - } else - state = parser_temp_realloc(state, - maxnest * sizeof(*state)); - } - level++; - state[level].parenlevel = 0; - if (subtype == VSMINUS || subtype == VSPLUS || - subtype == VSQUESTION || subtype == VSASSIGN) { - /* - * For operators that were in the Bourne shell, - * inherit the double-quote state. - */ - state[level].syntax = state[level - 1].syntax; - state[level].category = TSTATE_VAR_OLD; - } else { - /* - * The other operators take a pattern, - * so go to BASESYNTAX. - * Also, ' and " are now special, even - * in here documents. - */ - state[level].syntax = BASESYNTAX; - state[level].category = TSTATE_VAR_NEW; - newvarnest++; - } - } - } else if (c == '\'' && state[level].syntax == BASESYNTAX) { - /* $'cstylequotes' */ - USTPUTC(CTLQUOTEMARK, out); - state[level].syntax = SQSYNTAX; - sqiscstyle = 1; - } else { - USTPUTC('$', out); - pungetc(); - } - goto parsesub_return; -} - - -/* - * Parse an arithmetic expansion (indicate start of one and set state) - */ -parsearith: { - - if (level + 1 >= maxnest) { - maxnest *= 2; - if (state == state_static) { - state = parser_temp_alloc( - maxnest * sizeof(*state)); - memcpy(state, state_static, - MAXNEST_static * sizeof(*state)); - } else - state = parser_temp_realloc(state, - maxnest * sizeof(*state)); - } - level++; - state[level].syntax = ARISYNTAX; - state[level].parenlevel = 0; - state[level].category = TSTATE_ARITH; - USTPUTC(CTLARI, out); - if (state[level - 1].syntax == DQSYNTAX) - USTPUTC('"',out); - else - USTPUTC(' ',out); - goto parsearith_return; -} - -} /* end of readtoken */ - - -/* - * Returns true if the text contains nothing to expand (no dollar signs - * or backquotes). - */ - -static int -noexpand(char *text) -{ - char *p; - 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 true if the argument is a legal variable name (a letter or - * underscore followed by zero or more letters, underscores, and digits). - */ - -int -goodname(const char *name) -{ - const char *p; - - p = name; - if (! is_name(*p)) - return 0; - while (*++p) { - if (! is_in_name(*p)) - return 0; - } - return 1; -} - - -int -isassignment(const char *p) -{ - if (!is_name(*p)) - return 0; - p++; - for (;;) { - if (*p == '=') - return 1; - else if (!is_in_name(*p)) - return 0; - p++; - } -} - - -static void -consumetoken(int token) -{ - if (readtoken() != token) - synexpect(token); -} - - -/* - * 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); -} - - -static void -synerror(const char *msg) -{ - if (commandname) - outfmt(out2, "%s: %d: ", commandname, startlinno); - else if (arg0) - outfmt(out2, "%s: ", arg0); - outfmt(out2, "Syntax error: %s\n", msg); - error((char *)NULL); -} - -static void -setprompt(int which) -{ - whichprompt = which; - if (which == 0) - return; - - if (which == 1 && *ps0val()) { - out2str(expandprompt(ps0val())); - flushout(out2); - } - -#ifndef NO_HISTORY - if (!el) -#endif - { - out2str(getprompt(NULL)); - flushout(out2); - } -} - -static int -pgetc_linecont(void) -{ - int c; - - while ((c = pgetc_macro()) == '\\') { - c = pgetc(); - if (c == '\n') { - plinno++; - if (doprompt) - setprompt(2); - else - setprompt(0); - } else { - pungetc(); - /* Allow the backslash to be pushed back. */ - pushstring("\\", 1, NULL); - return (pgetc()); - } - } - return (c); -} - -static char * -expandprompt(const char *fmt) { - static char ps[PROMPTLEN]; - const char *pwd, *home; - int i, trim; - - /* - * Format prompt string. - */ - for (i = 0; (i < PROMPTLEN - 1) && (*fmt != '\0'); i++, fmt++) - if (*fmt == '\\') - switch (*++fmt) { - - /* - * Hostname. - * - * \h specifies just the local hostname, - * \H specifies fully-qualified hostname. - */ - case 'h': - case 'H': - ps[i] = '\0'; - gethostname(&ps[i], PROMPTLEN - i - 1); - ps[PROMPTLEN - 1] = '\0'; - /* Skip to end of hostname. */ - trim = (*fmt == 'h') ? '.' : '\0'; - while ((ps[i] != '\0') && (ps[i] != trim)) - i++; - --i; - break; - - /* - * Working directory. - * - * \W specifies just the final component, - * \w specifies the entire path. - */ - case 'W': - case 'w': - pwd = lookupvar("PWD"); - home = lookupvar("HOME"); - if (pwd == NULL || *pwd == '\0') - pwd = "?"; - if (home == NULL || *home == '\0') - home = "?"; - if (*fmt == 'W' && - *pwd == '/' && pwd[1] != '\0' && - strcmp(pwd, home) != 0) { - strlcpy(&ps[i], strrchr(pwd, '/') + 1, - PROMPTLEN - i); - } else { - if (strncmp(pwd, home, strlen(home)) == 0) { - ps[i++] = '~'; - pwd += strlen(home); - } - strlcpy(&ps[i], pwd, PROMPTLEN - i); - } - /* Skip to end of path. */ - while (ps[i] != '\0') - i++; - --i; - break; - - /* - * Exit status if non-zero. - */ - case '?': - if (exitstatus != 0) { - snprintf(&ps[i], PROMPTLEN - i, "%d", exitstatus); - while (ps[i] != '\0') - i++; - } - i--; - break; - - /* - * Superuser status. - * - * '$' for normal users, '#' for root. - */ - case '$': - ps[i] = (geteuid() != 0) ? '$' : '#'; - break; - - /* - * A literal \. - */ - case '\\': - ps[i] = '\\'; - break; - - /* - * Emit unrecognized formats verbatim. - */ - default: - ps[i] = '\\'; - if (i < PROMPTLEN - 2) - ps[++i] = *fmt; - break; - } - else - ps[i] = *fmt; - ps[i] = '\0'; - return (ps); -} - -/* - * called by editline -- any expansions to the prompt - * should be added here. - */ -char * -getprompt(void *unused __unused) -{ - const char *fmt; - static char internal_error[] = "??"; - - /* - * Select prompt format. - */ - switch (whichprompt) { - case 0: - fmt = ""; - break; - case 1: - fmt = ps1val(); - break; - case 2: - fmt = ps2val(); - break; - default: - return internal_error; - } - - return expandprompt(fmt); -} - -char * -getrprompt(void *unused __unused) -{ - const char *fmt; - static char internal_error[] = "??"; - - /* - * Select prompt format. - */ - switch (whichprompt) { - case 0: - fmt = ""; - break; - case 1: - fmt = rps1val(); - break; - case 2: - fmt = rps2val(); - break; - default: - return internal_error; - } - - return expandprompt(fmt); -} - - -const char * -expandstr(const char *ps) -{ - union node n; - struct jmploc jmploc; - struct jmploc *const savehandler = handler; - const int saveprompt = doprompt; - struct parsefile *const savetopfile = getcurrentfile(); - struct parser_temp *const saveparser_temp = parser_temp; - const char *result = NULL; - - if (!setjmp(jmploc.loc)) { - handler = &jmploc; - parser_temp = NULL; - setinputstring(ps, 1); - doprompt = 0; - readtoken1(pgetc(), DQSYNTAX, NOEOFMARK, 0); - if (backquotelist != NULL) - error("Command substitution not allowed here"); - - n.narg.type = NARG; - n.narg.next = NULL; - n.narg.text = wordtext; - n.narg.backquote = backquotelist; - - expandarg(&n, NULL, 0); - result = stackblock(); - INTOFF; - } - handler = savehandler; - doprompt = saveprompt; - popfilesupto(savetopfile); - if (parser_temp != saveparser_temp) { - parser_temp_free_all(); - parser_temp = saveparser_temp; - } - if (result != NULL) { - INTON; - } else if (exception == EXINT) - raise(SIGINT); - return result; -} |