expand.c revision 211646
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 4207944Sjilles * Copyright (c) 1997-2005 5207944Sjilles * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 61556Srgrimes * 71556Srgrimes * This code is derived from software contributed to Berkeley by 81556Srgrimes * Kenneth Almquist. 91556Srgrimes * 101556Srgrimes * Redistribution and use in source and binary forms, with or without 111556Srgrimes * modification, are permitted provided that the following conditions 121556Srgrimes * are met: 131556Srgrimes * 1. Redistributions of source code must retain the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer. 151556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161556Srgrimes * notice, this list of conditions and the following disclaimer in the 171556Srgrimes * documentation and/or other materials provided with the distribution. 181556Srgrimes * 4. Neither the name of the University nor the names of its contributors 191556Srgrimes * may be used to endorse or promote products derived from this software 201556Srgrimes * without specific prior written permission. 211556Srgrimes * 221556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321556Srgrimes * SUCH DAMAGE. 331556Srgrimes */ 341556Srgrimes 351556Srgrimes#ifndef lint 3636150Scharnier#if 0 3736150Scharnierstatic char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 3836150Scharnier#endif 391556Srgrimes#endif /* not lint */ 4099110Sobrien#include <sys/cdefs.h> 4199110Sobrien__FBSDID("$FreeBSD: head/bin/sh/expand.c 211646 2010-08-22 21:18:21Z jilles $"); 421556Srgrimes 4317987Speter#include <sys/types.h> 4417987Speter#include <sys/time.h> 4517987Speter#include <sys/stat.h> 4617987Speter#include <errno.h> 4717987Speter#include <dirent.h> 4817987Speter#include <unistd.h> 4917987Speter#include <pwd.h> 5017987Speter#include <stdlib.h> 5119281Sache#include <limits.h> 5238887Stegge#include <stdio.h> 53108286Stjr#include <string.h> 5417987Speter 551556Srgrimes/* 561556Srgrimes * Routines to expand arguments to commands. We have to deal with 571556Srgrimes * backquotes, shell variables, and file metacharacters. 581556Srgrimes */ 591556Srgrimes 601556Srgrimes#include "shell.h" 611556Srgrimes#include "main.h" 621556Srgrimes#include "nodes.h" 631556Srgrimes#include "eval.h" 641556Srgrimes#include "expand.h" 651556Srgrimes#include "syntax.h" 661556Srgrimes#include "parser.h" 671556Srgrimes#include "jobs.h" 681556Srgrimes#include "options.h" 691556Srgrimes#include "var.h" 701556Srgrimes#include "input.h" 711556Srgrimes#include "output.h" 721556Srgrimes#include "memalloc.h" 731556Srgrimes#include "error.h" 741556Srgrimes#include "mystring.h" 7517987Speter#include "arith.h" 7617987Speter#include "show.h" 771556Srgrimes 781556Srgrimes/* 791556Srgrimes * Structure specifying which parts of the string should be searched 801556Srgrimes * for IFS characters. 811556Srgrimes */ 821556Srgrimes 831556Srgrimesstruct ifsregion { 841556Srgrimes struct ifsregion *next; /* next region in list */ 851556Srgrimes int begoff; /* offset of start of region */ 861556Srgrimes int endoff; /* offset of end of region */ 87194975Sjilles int inquotes; /* search for nul bytes only */ 881556Srgrimes}; 891556Srgrimes 901556Srgrimes 91117261SddsSTATIC char *expdest; /* output of current string */ 92117261SddsSTATIC struct nodelist *argbackq; /* list of back quote expressions */ 93117261SddsSTATIC struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 94117261SddsSTATIC struct ifsregion *ifslastp; /* last struct in list */ 95117261SddsSTATIC struct arglist exparg; /* holds expanded arg list */ 961556Srgrimes 9790111SimpSTATIC void argstr(char *, int); 9890111SimpSTATIC char *exptilde(char *, int); 9990111SimpSTATIC void expbackq(union node *, int, int); 10090111SimpSTATIC int subevalvar(char *, char *, int, int, int, int); 10190111SimpSTATIC char *evalvar(char *, int); 10290111SimpSTATIC int varisset(char *, int); 103164081SstefanfSTATIC void varvalue(char *, int, int, int); 10490111SimpSTATIC void recordregion(int, int, int); 105155301SschweikhSTATIC void removerecordregions(int); 10690111SimpSTATIC void ifsbreakup(char *, struct arglist *); 10790111SimpSTATIC void expandmeta(struct strlist *, int); 10890111SimpSTATIC void expmeta(char *, char *); 10990111SimpSTATIC void addfname(char *); 11090111SimpSTATIC struct strlist *expsort(struct strlist *); 11190111SimpSTATIC struct strlist *msort(struct strlist *, int); 11290111SimpSTATIC char *cvtnum(int, char *); 11390111SimpSTATIC int collate_range_cmp(int, int); 1141556Srgrimes 11590111SimpSTATIC int 116118374Sachecollate_range_cmp(int c1, int c2) 11719281Sache{ 11819281Sache static char s1[2], s2[2]; 11919281Sache 12019281Sache s1[0] = c1; 12119281Sache s2[0] = c2; 122118374Sache return (strcoll(s1, s2)); 12319281Sache} 12419281Sache 1251556Srgrimes/* 1261556Srgrimes * Expand shell variables and backquotes inside a here document. 12790111Simp * union node *arg the document 12890111Simp * int fd; where to write the expanded version 1291556Srgrimes */ 1301556Srgrimes 1311556Srgrimesvoid 13290111Simpexpandhere(union node *arg, int fd) 13390111Simp{ 1341556Srgrimes herefd = fd; 1351556Srgrimes expandarg(arg, (struct arglist *)NULL, 0); 13639137Stegge xwrite(fd, stackblock(), expdest - stackblock()); 1371556Srgrimes} 1381556Srgrimes 1391556Srgrimes 1401556Srgrimes/* 1411556Srgrimes * Perform variable substitution and command substitution on an argument, 1421556Srgrimes * placing the resulting list of arguments in arglist. If EXP_FULL is true, 1431556Srgrimes * perform splitting and file name expansion. When arglist is NULL, perform 1441556Srgrimes * here document expansion. 1451556Srgrimes */ 1461556Srgrimes 1471556Srgrimesvoid 14890111Simpexpandarg(union node *arg, struct arglist *arglist, int flag) 14917987Speter{ 1501556Srgrimes struct strlist *sp; 1511556Srgrimes char *p; 1521556Srgrimes 1531556Srgrimes argbackq = arg->narg.backquote; 1541556Srgrimes STARTSTACKSTR(expdest); 1551556Srgrimes ifsfirst.next = NULL; 1561556Srgrimes ifslastp = NULL; 1571556Srgrimes argstr(arg->narg.text, flag); 1581556Srgrimes if (arglist == NULL) { 1591556Srgrimes return; /* here document expanded */ 1601556Srgrimes } 1611556Srgrimes STPUTC('\0', expdest); 1621556Srgrimes p = grabstackstr(expdest); 1631556Srgrimes exparg.lastp = &exparg.list; 1641556Srgrimes /* 1651556Srgrimes * TODO - EXP_REDIR 1661556Srgrimes */ 1671556Srgrimes if (flag & EXP_FULL) { 1681556Srgrimes ifsbreakup(p, &exparg); 1691556Srgrimes *exparg.lastp = NULL; 1701556Srgrimes exparg.lastp = &exparg.list; 1711556Srgrimes expandmeta(exparg.list, flag); 1721556Srgrimes } else { 1731556Srgrimes if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 1741556Srgrimes rmescapes(p); 1751556Srgrimes sp = (struct strlist *)stalloc(sizeof (struct strlist)); 1761556Srgrimes sp->text = p; 1771556Srgrimes *exparg.lastp = sp; 1781556Srgrimes exparg.lastp = &sp->next; 1791556Srgrimes } 1801556Srgrimes while (ifsfirst.next != NULL) { 1811556Srgrimes struct ifsregion *ifsp; 1821556Srgrimes INTOFF; 1831556Srgrimes ifsp = ifsfirst.next->next; 1841556Srgrimes ckfree(ifsfirst.next); 1851556Srgrimes ifsfirst.next = ifsp; 1861556Srgrimes INTON; 1871556Srgrimes } 1881556Srgrimes *exparg.lastp = NULL; 1891556Srgrimes if (exparg.list) { 1901556Srgrimes *arglist->lastp = exparg.list; 1911556Srgrimes arglist->lastp = exparg.lastp; 1921556Srgrimes } 1931556Srgrimes} 1941556Srgrimes 1951556Srgrimes 1961556Srgrimes 1971556Srgrimes/* 1981556Srgrimes * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 1991556Srgrimes * characters to allow for further processing. Otherwise treat 2001556Srgrimes * $@ like $* since no splitting will be performed. 2011556Srgrimes */ 2021556Srgrimes 2031556SrgrimesSTATIC void 20490111Simpargstr(char *p, int flag) 20517987Speter{ 20625233Ssteve char c; 207104672Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 2081556Srgrimes int firsteq = 1; 2091556Srgrimes 2101556Srgrimes if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 2111556Srgrimes p = exptilde(p, flag); 2121556Srgrimes for (;;) { 2131556Srgrimes switch (c = *p++) { 2141556Srgrimes case '\0': 2151556Srgrimes case CTLENDVAR: /* ??? */ 2161556Srgrimes goto breakloop; 21738887Stegge case CTLQUOTEMARK: 21838887Stegge /* "$@" syntax adherence hack */ 21938887Stegge if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 22038887Stegge break; 22139137Stegge if ((flag & EXP_FULL) != 0) 22239137Stegge STPUTC(c, expdest); 22338887Stegge break; 2241556Srgrimes case CTLESC: 2251556Srgrimes if (quotes) 2261556Srgrimes STPUTC(c, expdest); 2271556Srgrimes c = *p++; 2281556Srgrimes STPUTC(c, expdest); 2291556Srgrimes break; 2301556Srgrimes case CTLVAR: 2311556Srgrimes p = evalvar(p, flag); 2321556Srgrimes break; 2331556Srgrimes case CTLBACKQ: 2341556Srgrimes case CTLBACKQ|CTLQUOTE: 2351556Srgrimes expbackq(argbackq->n, c & CTLQUOTE, flag); 2361556Srgrimes argbackq = argbackq->next; 2371556Srgrimes break; 2381556Srgrimes case CTLENDARI: 2391556Srgrimes expari(flag); 2401556Srgrimes break; 2411556Srgrimes case ':': 2421556Srgrimes case '=': 2431556Srgrimes /* 2441556Srgrimes * sort of a hack - expand tildes in variable 2451556Srgrimes * assignments (after the first '=' and after ':'s). 2461556Srgrimes */ 2471556Srgrimes STPUTC(c, expdest); 2481556Srgrimes if (flag & EXP_VARTILDE && *p == '~') { 2491556Srgrimes if (c == '=') { 2501556Srgrimes if (firsteq) 2511556Srgrimes firsteq = 0; 2521556Srgrimes else 2531556Srgrimes break; 2541556Srgrimes } 2551556Srgrimes p = exptilde(p, flag); 2561556Srgrimes } 2571556Srgrimes break; 2581556Srgrimes default: 2591556Srgrimes STPUTC(c, expdest); 2601556Srgrimes } 2611556Srgrimes } 2621556Srgrimesbreakloop:; 2631556Srgrimes} 2641556Srgrimes 2651556SrgrimesSTATIC char * 26690111Simpexptilde(char *p, int flag) 26717987Speter{ 2681556Srgrimes char c, *startp = p; 2691556Srgrimes struct passwd *pw; 2701556Srgrimes char *home; 271108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 2721556Srgrimes 27317987Speter while ((c = *p) != '\0') { 2741556Srgrimes switch(c) { 275200988Sjilles case CTLESC: /* This means CTL* are always considered quoted. */ 276200988Sjilles case CTLVAR: 277200988Sjilles case CTLBACKQ: 278200988Sjilles case CTLBACKQ | CTLQUOTE: 279200988Sjilles case CTLARI: 280200988Sjilles case CTLENDARI: 28139137Stegge case CTLQUOTEMARK: 28239137Stegge return (startp); 2831556Srgrimes case ':': 2841556Srgrimes if (flag & EXP_VARTILDE) 2851556Srgrimes goto done; 2861556Srgrimes break; 2871556Srgrimes case '/': 288206150Sjilles case CTLENDVAR: 2891556Srgrimes goto done; 2901556Srgrimes } 2911556Srgrimes p++; 2921556Srgrimes } 2931556Srgrimesdone: 2941556Srgrimes *p = '\0'; 2951556Srgrimes if (*(startp+1) == '\0') { 2961556Srgrimes if ((home = lookupvar("HOME")) == NULL) 2971556Srgrimes goto lose; 2981556Srgrimes } else { 2991556Srgrimes if ((pw = getpwnam(startp+1)) == NULL) 3001556Srgrimes goto lose; 3011556Srgrimes home = pw->pw_dir; 3021556Srgrimes } 3031556Srgrimes if (*home == '\0') 3041556Srgrimes goto lose; 3051556Srgrimes *p = c; 30617987Speter while ((c = *home++) != '\0') { 30783675Stegge if (quotes && SQSYNTAX[(int)c] == CCTL) 3081556Srgrimes STPUTC(CTLESC, expdest); 3091556Srgrimes STPUTC(c, expdest); 3101556Srgrimes } 3111556Srgrimes return (p); 3121556Srgrimeslose: 3131556Srgrimes *p = c; 3141556Srgrimes return (startp); 3151556Srgrimes} 3161556Srgrimes 3171556Srgrimes 318155301SschweikhSTATIC void 31990111Simpremoverecordregions(int endoff) 32038887Stegge{ 32138887Stegge if (ifslastp == NULL) 32238887Stegge return; 32338887Stegge 32438887Stegge if (ifsfirst.endoff > endoff) { 32538887Stegge while (ifsfirst.next != NULL) { 32638887Stegge struct ifsregion *ifsp; 32738887Stegge INTOFF; 32838887Stegge ifsp = ifsfirst.next->next; 32938887Stegge ckfree(ifsfirst.next); 33038887Stegge ifsfirst.next = ifsp; 33138887Stegge INTON; 33238887Stegge } 33338887Stegge if (ifsfirst.begoff > endoff) 33438887Stegge ifslastp = NULL; 33538887Stegge else { 33638887Stegge ifslastp = &ifsfirst; 33738887Stegge ifsfirst.endoff = endoff; 33838887Stegge } 33938887Stegge return; 34038887Stegge } 341155301Sschweikh 34238887Stegge ifslastp = &ifsfirst; 34338887Stegge while (ifslastp->next && ifslastp->next->begoff < endoff) 34438887Stegge ifslastp=ifslastp->next; 34538887Stegge while (ifslastp->next != NULL) { 34638887Stegge struct ifsregion *ifsp; 34738887Stegge INTOFF; 34838887Stegge ifsp = ifslastp->next->next; 34938887Stegge ckfree(ifslastp->next); 35038887Stegge ifslastp->next = ifsp; 35138887Stegge INTON; 35238887Stegge } 35338887Stegge if (ifslastp->endoff > endoff) 35438887Stegge ifslastp->endoff = endoff; 35538887Stegge} 35638887Stegge 3571556Srgrimes/* 3581556Srgrimes * Expand arithmetic expression. Backup to start of expression, 3591556Srgrimes * evaluate, place result in (backed up) result, adjust string position. 3601556Srgrimes */ 3611556Srgrimesvoid 36290111Simpexpari(int flag) 36317987Speter{ 364207206Sjilles char *p, *q, *start; 365178631Sstefanf arith_t result; 36638887Stegge int begoff; 367108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 36838887Stegge int quoted; 3691556Srgrimes 37025233Ssteve 3711556Srgrimes /* 37246684Skris * This routine is slightly over-complicated for 3731556Srgrimes * efficiency. First we make sure there is 3741556Srgrimes * enough space for the result, which may be bigger 37546684Skris * than the expression if we add exponentiation. Next we 3761556Srgrimes * scan backwards looking for the start of arithmetic. If the 3771556Srgrimes * next previous character is a CTLESC character, then we 3781556Srgrimes * have to rescan starting from the beginning since CTLESC 3798855Srgrimes * characters have to be processed left to right. 3801556Srgrimes */ 381178631Sstefanf CHECKSTRSPACE(DIGITS(result) - 2, expdest); 3828855Srgrimes USTPUTC('\0', expdest); 3831556Srgrimes start = stackblock(); 38483676Stegge p = expdest - 2; 38583676Stegge while (p >= start && *p != CTLARI) 3861556Srgrimes --p; 38783676Stegge if (p < start || *p != CTLARI) 3881556Srgrimes error("missing CTLARI (shouldn't happen)"); 38983676Stegge if (p > start && *(p - 1) == CTLESC) 3901556Srgrimes for (p = start; *p != CTLARI; p++) 3911556Srgrimes if (*p == CTLESC) 3921556Srgrimes p++; 39338887Stegge 39438887Stegge if (p[1] == '"') 39538887Stegge quoted=1; 39638887Stegge else 39738887Stegge quoted=0; 39838887Stegge begoff = p - start; 39938887Stegge removerecordregions(begoff); 4001556Srgrimes if (quotes) 40138887Stegge rmescapes(p+2); 402207206Sjilles q = grabstackstr(expdest); 40338887Stegge result = arith(p+2); 404207206Sjilles ungrabstackstr(q, expdest); 405178631Sstefanf fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 4061556Srgrimes while (*p++) 4071556Srgrimes ; 40838887Stegge if (quoted == 0) 40938887Stegge recordregion(begoff, p - 1 - start, 0); 4101556Srgrimes result = expdest - p + 1; 4111556Srgrimes STADJUST(-result, expdest); 4121556Srgrimes} 4131556Srgrimes 4141556Srgrimes 4151556Srgrimes/* 4161556Srgrimes * Expand stuff in backwards quotes. 4171556Srgrimes */ 4181556Srgrimes 4191556SrgrimesSTATIC void 42090111Simpexpbackq(union node *cmd, int quoted, int flag) 42117987Speter{ 4221556Srgrimes struct backcmd in; 4231556Srgrimes int i; 4241556Srgrimes char buf[128]; 4251556Srgrimes char *p; 4261556Srgrimes char *dest = expdest; 4271556Srgrimes struct ifsregion saveifs, *savelastp; 4281556Srgrimes struct nodelist *saveargbackq; 4291556Srgrimes char lastc; 4301556Srgrimes int startloc = dest - stackblock(); 4311556Srgrimes char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 4321556Srgrimes int saveherefd; 433108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 434115424Sfenner int nnl; 4351556Srgrimes 4361556Srgrimes INTOFF; 4371556Srgrimes saveifs = ifsfirst; 4381556Srgrimes savelastp = ifslastp; 4391556Srgrimes saveargbackq = argbackq; 4408855Srgrimes saveherefd = herefd; 4411556Srgrimes herefd = -1; 4421556Srgrimes p = grabstackstr(dest); 4431556Srgrimes evalbackcmd(cmd, &in); 4441556Srgrimes ungrabstackstr(p, dest); 4451556Srgrimes ifsfirst = saveifs; 4461556Srgrimes ifslastp = savelastp; 4471556Srgrimes argbackq = saveargbackq; 4481556Srgrimes herefd = saveherefd; 4491556Srgrimes 4501556Srgrimes p = in.buf; 4511556Srgrimes lastc = '\0'; 452115424Sfenner nnl = 0; 453115424Sfenner /* Don't copy trailing newlines */ 4541556Srgrimes for (;;) { 4551556Srgrimes if (--in.nleft < 0) { 4561556Srgrimes if (in.fd < 0) 4571556Srgrimes break; 4581556Srgrimes while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 4591556Srgrimes TRACE(("expbackq: read returns %d\n", i)); 4601556Srgrimes if (i <= 0) 4611556Srgrimes break; 4621556Srgrimes p = buf; 4631556Srgrimes in.nleft = i - 1; 4641556Srgrimes } 4651556Srgrimes lastc = *p++; 4661556Srgrimes if (lastc != '\0') { 46783675Stegge if (quotes && syntax[(int)lastc] == CCTL) 4681556Srgrimes STPUTC(CTLESC, dest); 469115424Sfenner if (lastc == '\n') { 470115424Sfenner nnl++; 471115424Sfenner } else { 472115424Sfenner while (nnl > 0) { 473115424Sfenner nnl--; 474115424Sfenner STPUTC('\n', dest); 475115424Sfenner } 476115424Sfenner STPUTC(lastc, dest); 477115424Sfenner } 4781556Srgrimes } 4791556Srgrimes } 48017987Speter 4811556Srgrimes if (in.fd >= 0) 4821556Srgrimes close(in.fd); 4831556Srgrimes if (in.buf) 4841556Srgrimes ckfree(in.buf); 4851556Srgrimes if (in.jp) 48645916Scracauer exitstatus = waitforjob(in.jp, (int *)NULL); 4871556Srgrimes if (quoted == 0) 4881556Srgrimes recordregion(startloc, dest - stackblock(), 0); 4891556Srgrimes TRACE(("evalbackq: size=%d: \"%.*s\"\n", 4901556Srgrimes (dest - stackblock()) - startloc, 4911556Srgrimes (dest - stackblock()) - startloc, 4921556Srgrimes stackblock() + startloc)); 4931556Srgrimes expdest = dest; 4941556Srgrimes INTON; 4951556Srgrimes} 4961556Srgrimes 4971556Srgrimes 4981556Srgrimes 49917987SpeterSTATIC int 50090111Simpsubevalvar(char *p, char *str, int strloc, int subtype, int startloc, 50190111Simp int varflags) 50217987Speter{ 50317987Speter char *startp; 50417987Speter char *loc = NULL; 50545514Stegge char *q; 50617987Speter int c = 0; 50717987Speter int saveherefd = herefd; 50817987Speter struct nodelist *saveargbackq = argbackq; 50920425Ssteve int amount; 51020425Ssteve 51117987Speter herefd = -1; 512206150Sjilles argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 513206147Sjilles subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 514206150Sjilles EXP_CASE : 0) | EXP_TILDE); 51517987Speter STACKSTRNUL(expdest); 51617987Speter herefd = saveherefd; 51717987Speter argbackq = saveargbackq; 51817987Speter startp = stackblock() + startloc; 51920425Ssteve if (str == NULL) 52020425Ssteve str = stackblock() + strloc; 52117987Speter 52217987Speter switch (subtype) { 52317987Speter case VSASSIGN: 52417987Speter setvar(str, startp, 0); 52520425Ssteve amount = startp - expdest; 52620425Ssteve STADJUST(amount, expdest); 52717987Speter varflags &= ~VSNUL; 52817987Speter if (c != 0) 52917987Speter *loc = c; 53017987Speter return 1; 53117987Speter 53217987Speter case VSQUESTION: 53317987Speter if (*p != CTLENDVAR) { 534201366Sjilles outfmt(out2, "%s\n", startp); 53517987Speter error((char *)NULL); 53617987Speter } 537112254Sru error("%.*s: parameter %snot set", (int)(p - str - 1), 53817987Speter str, (varflags & VSNUL) ? "null or " 53917987Speter : nullstr); 54017987Speter return 0; 54117987Speter 54217987Speter case VSTRIMLEFT: 54325233Ssteve for (loc = startp; loc < str; loc++) { 54417987Speter c = *loc; 54517987Speter *loc = '\0'; 54645514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 54717987Speter *loc = c; 54817987Speter goto recordleft; 54917987Speter } 55017987Speter *loc = c; 55145514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 55245514Stegge loc++; 55317987Speter } 55417987Speter return 0; 55517987Speter 55617987Speter case VSTRIMLEFTMAX: 55745514Stegge for (loc = str - 1; loc >= startp;) { 55817987Speter c = *loc; 55917987Speter *loc = '\0'; 56045514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 56117987Speter *loc = c; 56217987Speter goto recordleft; 56317987Speter } 56417987Speter *loc = c; 56545514Stegge loc--; 56645514Stegge if ((varflags & VSQUOTE) && loc > startp && 56745514Stegge *(loc - 1) == CTLESC) { 56845514Stegge for (q = startp; q < loc; q++) 56945514Stegge if (*q == CTLESC) 57045514Stegge q++; 57145514Stegge if (q > loc) 57245514Stegge loc--; 57345514Stegge } 57417987Speter } 57517987Speter return 0; 57617987Speter 57717987Speter case VSTRIMRIGHT: 57845514Stegge for (loc = str - 1; loc >= startp;) { 57945514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 58020425Ssteve amount = loc - expdest; 58120425Ssteve STADJUST(amount, expdest); 58217987Speter return 1; 58317987Speter } 58445514Stegge loc--; 58545514Stegge if ((varflags & VSQUOTE) && loc > startp && 586155301Sschweikh *(loc - 1) == CTLESC) { 58745514Stegge for (q = startp; q < loc; q++) 58845514Stegge if (*q == CTLESC) 58945514Stegge q++; 59045514Stegge if (q > loc) 59145514Stegge loc--; 59245514Stegge } 59317987Speter } 59417987Speter return 0; 59517987Speter 59617987Speter case VSTRIMRIGHTMAX: 59717987Speter for (loc = startp; loc < str - 1; loc++) { 59845514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 59920425Ssteve amount = loc - expdest; 60020425Ssteve STADJUST(amount, expdest); 60117987Speter return 1; 60217987Speter } 60345514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 60445514Stegge loc++; 60517987Speter } 60617987Speter return 0; 60717987Speter 60817987Speter 60917987Speter default: 61017987Speter abort(); 61117987Speter } 61217987Speter 61317987Speterrecordleft: 61420425Ssteve amount = ((str - 1) - (loc - startp)) - expdest; 61520425Ssteve STADJUST(amount, expdest); 61617987Speter while (loc != str - 1) 61717987Speter *startp++ = *loc++; 61817987Speter return 1; 61917987Speter} 62017987Speter 62117987Speter 6221556Srgrimes/* 6231556Srgrimes * Expand a variable, and return a pointer to the next character in the 6241556Srgrimes * input string. 6251556Srgrimes */ 6261556Srgrimes 6271556SrgrimesSTATIC char * 62890111Simpevalvar(char *p, int flag) 62917987Speter{ 6301556Srgrimes int subtype; 6311556Srgrimes int varflags; 6321556Srgrimes char *var; 6331556Srgrimes char *val; 63445644Stegge int patloc; 6351556Srgrimes int c; 6361556Srgrimes int set; 6371556Srgrimes int special; 6381556Srgrimes int startloc; 63917987Speter int varlen; 64017987Speter int easy; 641108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 6421556Srgrimes 643164081Sstefanf varflags = (unsigned char)*p++; 6441556Srgrimes subtype = varflags & VSTYPE; 6451556Srgrimes var = p; 6461556Srgrimes special = 0; 6471556Srgrimes if (! is_name(*p)) 6481556Srgrimes special = 1; 6491556Srgrimes p = strchr(p, '=') + 1; 6501556Srgrimesagain: /* jump here after setting a variable with ${var=text} */ 651179022Sstefanf if (varflags & VSLINENO) { 652179022Sstefanf set = 1; 653179022Sstefanf special = 0; 654179022Sstefanf val = var; 655179022Sstefanf p[-1] = '\0'; /* temporarily overwrite '=' to have \0 656179022Sstefanf terminated string */ 657179022Sstefanf } else if (special) { 65825233Ssteve set = varisset(var, varflags & VSNUL); 6591556Srgrimes val = NULL; 6601556Srgrimes } else { 66160592Scracauer val = bltinlookup(var, 1); 66217987Speter if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 6631556Srgrimes val = NULL; 6641556Srgrimes set = 0; 6651556Srgrimes } else 6661556Srgrimes set = 1; 6671556Srgrimes } 66817987Speter varlen = 0; 6691556Srgrimes startloc = expdest - stackblock(); 670198454Sjilles if (!set && uflag && *var != '@' && *var != '*') { 67196939Stjr switch (subtype) { 67296939Stjr case VSNORMAL: 67396939Stjr case VSTRIMLEFT: 67496939Stjr case VSTRIMLEFTMAX: 67596939Stjr case VSTRIMRIGHT: 67696939Stjr case VSTRIMRIGHTMAX: 67796939Stjr case VSLENGTH: 678112254Sru error("%.*s: parameter not set", (int)(p - var - 1), 679112254Sru var); 68096939Stjr } 68196939Stjr } 6821556Srgrimes if (set && subtype != VSPLUS) { 6831556Srgrimes /* insert the value of the variable */ 6841556Srgrimes if (special) { 685164081Sstefanf varvalue(var, varflags & VSQUOTE, subtype, flag); 68617987Speter if (subtype == VSLENGTH) { 68725233Ssteve varlen = expdest - stackblock() - startloc; 68825233Ssteve STADJUST(-varlen, expdest); 68917987Speter } 6901556Srgrimes } else { 69120425Ssteve char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 69217987Speter : BASESYNTAX; 6931556Srgrimes 69417987Speter if (subtype == VSLENGTH) { 69517987Speter for (;*val; val++) 69617987Speter varlen++; 6971556Srgrimes } 69817987Speter else { 69917987Speter while (*val) { 70083675Stegge if (quotes && 70154132Scracauer syntax[(int)*val] == CCTL) 70217987Speter STPUTC(CTLESC, expdest); 70317987Speter STPUTC(*val++, expdest); 70417987Speter } 70517987Speter 70617987Speter } 7071556Srgrimes } 7081556Srgrimes } 70920425Ssteve 7101556Srgrimes if (subtype == VSPLUS) 7111556Srgrimes set = ! set; 71217987Speter 71320425Ssteve easy = ((varflags & VSQUOTE) == 0 || 71417987Speter (*var == '@' && shellparam.nparam != 1)); 71517987Speter 71617987Speter 71717987Speter switch (subtype) { 71817987Speter case VSLENGTH: 71917987Speter expdest = cvtnum(varlen, expdest); 72017987Speter goto record; 72117987Speter 72217987Speter case VSNORMAL: 72317987Speter if (!easy) 72417987Speter break; 72517987Speterrecord: 72620425Ssteve recordregion(startloc, expdest - stackblock(), 72717987Speter varflags & VSQUOTE); 72817987Speter break; 72917987Speter 73017987Speter case VSPLUS: 73117987Speter case VSMINUS: 73217987Speter if (!set) { 7331556Srgrimes argstr(p, flag); 73417987Speter break; 73517987Speter } 73617987Speter if (easy) 73717987Speter goto record; 73817987Speter break; 73917987Speter 74017987Speter case VSTRIMLEFT: 74117987Speter case VSTRIMLEFTMAX: 74217987Speter case VSTRIMRIGHT: 74317987Speter case VSTRIMRIGHTMAX: 74417987Speter if (!set) 74517987Speter break; 74617987Speter /* 74717987Speter * Terminate the string and start recording the pattern 74817987Speter * right after it 74917987Speter */ 75017987Speter STPUTC('\0', expdest); 75145644Stegge patloc = expdest - stackblock(); 75245644Stegge if (subevalvar(p, NULL, patloc, subtype, 75338887Stegge startloc, varflags) == 0) { 75445644Stegge int amount = (expdest - stackblock() - patloc) + 1; 75525233Ssteve STADJUST(-amount, expdest); 75625233Ssteve } 75738887Stegge /* Remove any recorded regions beyond start of variable */ 75838887Stegge removerecordregions(startloc); 75938887Stegge goto record; 76017987Speter 76117987Speter case VSASSIGN: 76217987Speter case VSQUESTION: 76317987Speter if (!set) { 76420425Ssteve if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 76520425Ssteve varflags &= ~VSNUL; 766155301Sschweikh /* 767155301Sschweikh * Remove any recorded regions beyond 768155301Sschweikh * start of variable 76938887Stegge */ 77038887Stegge removerecordregions(startloc); 7711556Srgrimes goto again; 77220425Ssteve } 77317987Speter break; 7741556Srgrimes } 77517987Speter if (easy) 77617987Speter goto record; 77717987Speter break; 77817987Speter 779164003Sstefanf case VSERROR: 780164003Sstefanf c = p - var - 1; 781164003Sstefanf error("${%.*s%s}: Bad substitution", c, var, 782164003Sstefanf (c > 0 && *p != CTLENDVAR) ? "..." : ""); 783164003Sstefanf 78417987Speter default: 78517987Speter abort(); 7861556Srgrimes } 787179022Sstefanf p[-1] = '='; /* recover overwritten '=' */ 78817987Speter 7891556Srgrimes if (subtype != VSNORMAL) { /* skip to end of alternative */ 7901556Srgrimes int nesting = 1; 7911556Srgrimes for (;;) { 7921556Srgrimes if ((c = *p++) == CTLESC) 7931556Srgrimes p++; 7941556Srgrimes else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 7951556Srgrimes if (set) 7961556Srgrimes argbackq = argbackq->next; 7971556Srgrimes } else if (c == CTLVAR) { 7981556Srgrimes if ((*p++ & VSTYPE) != VSNORMAL) 7991556Srgrimes nesting++; 8001556Srgrimes } else if (c == CTLENDVAR) { 8011556Srgrimes if (--nesting == 0) 8021556Srgrimes break; 8031556Srgrimes } 8041556Srgrimes } 8051556Srgrimes } 8061556Srgrimes return p; 8071556Srgrimes} 8081556Srgrimes 8091556Srgrimes 8101556Srgrimes 8111556Srgrimes/* 8121556Srgrimes * Test whether a specialized variable is set. 8131556Srgrimes */ 8141556Srgrimes 8151556SrgrimesSTATIC int 81690111Simpvarisset(char *name, int nulok) 81725233Ssteve{ 8181556Srgrimes 81925233Ssteve if (*name == '!') 820209600Sjilles return backgndpidset(); 82125233Ssteve else if (*name == '@' || *name == '*') { 8221556Srgrimes if (*shellparam.p == NULL) 8231556Srgrimes return 0; 82425233Ssteve 82525233Ssteve if (nulok) { 82625233Ssteve char **av; 82725233Ssteve 82825233Ssteve for (av = shellparam.p; *av; av++) 82925233Ssteve if (**av != '\0') 83025233Ssteve return 1; 83125233Ssteve return 0; 83225233Ssteve } 83318202Speter } else if (is_digit(*name)) { 83425233Ssteve char *ap; 83520425Ssteve int num = atoi(name); 83625233Ssteve 83725233Ssteve if (num > shellparam.nparam) 83825233Ssteve return 0; 83925233Ssteve 84025233Ssteve if (num == 0) 84125233Ssteve ap = arg0; 84225233Ssteve else 84325233Ssteve ap = shellparam.p[num - 1]; 84425233Ssteve 84525233Ssteve if (nulok && (ap == NULL || *ap == '\0')) 84625233Ssteve return 0; 8471556Srgrimes } 8481556Srgrimes return 1; 8491556Srgrimes} 8501556Srgrimes 8511556Srgrimes 8521556Srgrimes 8531556Srgrimes/* 8541556Srgrimes * Add the value of a specialized variable to the stack string. 8551556Srgrimes */ 8561556Srgrimes 8571556SrgrimesSTATIC void 858164081Sstefanfvarvalue(char *name, int quoted, int subtype, int flag) 85917987Speter{ 8601556Srgrimes int num; 8611556Srgrimes char *p; 8621556Srgrimes int i; 8631556Srgrimes char sep; 8641556Srgrimes char **ap; 8651556Srgrimes char const *syntax; 8661556Srgrimes 8671556Srgrimes#define STRTODEST(p) \ 8681556Srgrimes do {\ 869164081Sstefanf if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \ 8701556Srgrimes syntax = quoted? DQSYNTAX : BASESYNTAX; \ 8711556Srgrimes while (*p) { \ 87283675Stegge if (syntax[(int)*p] == CCTL) \ 8731556Srgrimes STPUTC(CTLESC, expdest); \ 8741556Srgrimes STPUTC(*p++, expdest); \ 8751556Srgrimes } \ 8761556Srgrimes } else \ 8771556Srgrimes while (*p) \ 8781556Srgrimes STPUTC(*p++, expdest); \ 8791556Srgrimes } while (0) 8801556Srgrimes 8811556Srgrimes 88218202Speter switch (*name) { 8831556Srgrimes case '$': 8841556Srgrimes num = rootpid; 8851556Srgrimes goto numvar; 8861556Srgrimes case '?': 88717987Speter num = oexitstatus; 8881556Srgrimes goto numvar; 8891556Srgrimes case '#': 8901556Srgrimes num = shellparam.nparam; 8911556Srgrimes goto numvar; 8921556Srgrimes case '!': 893209600Sjilles num = backgndpidval(); 8941556Srgrimesnumvar: 89517987Speter expdest = cvtnum(num, expdest); 8961556Srgrimes break; 8971556Srgrimes case '-': 8981556Srgrimes for (i = 0 ; i < NOPTS ; i++) { 8991556Srgrimes if (optlist[i].val) 9001556Srgrimes STPUTC(optlist[i].letter, expdest); 9011556Srgrimes } 9021556Srgrimes break; 9031556Srgrimes case '@': 904164081Sstefanf if (flag & EXP_FULL && quoted) { 90538887Stegge for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 90638887Stegge STRTODEST(p); 90738887Stegge if (*ap) 90838887Stegge STPUTC('\0', expdest); 90938887Stegge } 91038887Stegge break; 9111556Srgrimes } 912102410Scharnier /* FALLTHROUGH */ 9131556Srgrimes case '*': 914149825Srse if (ifsset()) 91538887Stegge sep = ifsval()[0]; 91638887Stegge else 91738887Stegge sep = ' '; 9181556Srgrimes for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 9191556Srgrimes STRTODEST(p); 92038887Stegge if (*ap && sep) 9211556Srgrimes STPUTC(sep, expdest); 9221556Srgrimes } 9231556Srgrimes break; 9241556Srgrimes case '0': 9251556Srgrimes p = arg0; 9261556Srgrimes STRTODEST(p); 9271556Srgrimes break; 9281556Srgrimes default: 92918202Speter if (is_digit(*name)) { 93018202Speter num = atoi(name); 93118202Speter if (num > 0 && num <= shellparam.nparam) { 93218202Speter p = shellparam.p[num - 1]; 93318202Speter STRTODEST(p); 93418202Speter } 9351556Srgrimes } 9361556Srgrimes break; 9371556Srgrimes } 9381556Srgrimes} 9391556Srgrimes 9401556Srgrimes 9411556Srgrimes 9421556Srgrimes/* 9431556Srgrimes * Record the the fact that we have to scan this region of the 9441556Srgrimes * string for IFS characters. 9451556Srgrimes */ 9461556Srgrimes 9471556SrgrimesSTATIC void 948194975Sjillesrecordregion(int start, int end, int inquotes) 94917987Speter{ 95025233Ssteve struct ifsregion *ifsp; 9511556Srgrimes 9521556Srgrimes if (ifslastp == NULL) { 9531556Srgrimes ifsp = &ifsfirst; 9541556Srgrimes } else { 955194975Sjilles if (ifslastp->endoff == start 956194975Sjilles && ifslastp->inquotes == inquotes) { 957194975Sjilles /* extend previous area */ 958194975Sjilles ifslastp->endoff = end; 959194975Sjilles return; 960194975Sjilles } 9611556Srgrimes ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 9621556Srgrimes ifslastp->next = ifsp; 9631556Srgrimes } 9641556Srgrimes ifslastp = ifsp; 9651556Srgrimes ifslastp->next = NULL; 9661556Srgrimes ifslastp->begoff = start; 9671556Srgrimes ifslastp->endoff = end; 968194975Sjilles ifslastp->inquotes = inquotes; 9691556Srgrimes} 9701556Srgrimes 9711556Srgrimes 9721556Srgrimes 9731556Srgrimes/* 9741556Srgrimes * Break the argument string into pieces based upon IFS and add the 9751556Srgrimes * strings to the argument list. The regions of the string to be 9761556Srgrimes * searched for IFS characters have been stored by recordregion. 9771556Srgrimes */ 9781556SrgrimesSTATIC void 97990111Simpifsbreakup(char *string, struct arglist *arglist) 98090111Simp{ 9811556Srgrimes struct ifsregion *ifsp; 9821556Srgrimes struct strlist *sp; 9831556Srgrimes char *start; 98425233Ssteve char *p; 9851556Srgrimes char *q; 986201053Sjilles const char *ifs; 987194975Sjilles const char *ifsspc; 988194975Sjilles int had_param_ch = 0; 9891556Srgrimes 990194975Sjilles start = string; 99117987Speter 992194975Sjilles if (ifslastp == NULL) { 993194975Sjilles /* Return entire argument, IFS doesn't apply to any of it */ 994194975Sjilles sp = (struct strlist *)stalloc(sizeof *sp); 995194975Sjilles sp->text = start; 996194975Sjilles *arglist->lastp = sp; 997194975Sjilles arglist->lastp = &sp->next; 998194975Sjilles return; 999194975Sjilles } 1000194975Sjilles 1001194975Sjilles ifs = ifsset() ? ifsval() : " \t\n"; 1002194975Sjilles 1003194975Sjilles for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1004194975Sjilles p = string + ifsp->begoff; 1005194975Sjilles while (p < string + ifsp->endoff) { 1006194975Sjilles q = p; 1007194975Sjilles if (*p == CTLESC) 1008194975Sjilles p++; 1009194975Sjilles if (ifsp->inquotes) { 1010194975Sjilles /* Only NULs (should be from "$@") end args */ 1011194977Sjilles had_param_ch = 1; 1012194975Sjilles if (*p != 0) { 10131556Srgrimes p++; 1014194975Sjilles continue; 1015194975Sjilles } 1016194975Sjilles ifsspc = NULL; 1017194975Sjilles } else { 1018194975Sjilles if (!strchr(ifs, *p)) { 1019194977Sjilles had_param_ch = 1; 102038887Stegge p++; 1021194975Sjilles continue; 1022194975Sjilles } 1023194975Sjilles ifsspc = strchr(" \t\n", *p); 1024194975Sjilles 1025194975Sjilles /* Ignore IFS whitespace at start */ 1026194975Sjilles if (q == start && ifsspc != NULL) { 1027194975Sjilles p++; 10281556Srgrimes start = p; 1029194975Sjilles continue; 1030194975Sjilles } 1031194977Sjilles had_param_ch = 0; 10321556Srgrimes } 1033194975Sjilles 1034194975Sjilles /* Save this argument... */ 1035194975Sjilles *q = '\0'; 10361556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10371556Srgrimes sp->text = start; 10381556Srgrimes *arglist->lastp = sp; 10391556Srgrimes arglist->lastp = &sp->next; 1040194975Sjilles p++; 1041194975Sjilles 1042194975Sjilles if (ifsspc != NULL) { 1043194975Sjilles /* Ignore further trailing IFS whitespace */ 1044194975Sjilles for (; p < string + ifsp->endoff; p++) { 1045194975Sjilles q = p; 1046194975Sjilles if (*p == CTLESC) 1047194975Sjilles p++; 1048194975Sjilles if (strchr(ifs, *p) == NULL) { 1049194975Sjilles p = q; 1050194975Sjilles break; 1051194975Sjilles } 1052194975Sjilles if (strchr(" \t\n", *p) == NULL) { 1053194975Sjilles p++; 1054194975Sjilles break; 1055194975Sjilles } 1056194975Sjilles } 1057194975Sjilles } 1058194975Sjilles start = p; 10591556Srgrimes } 1060194975Sjilles } 1061194975Sjilles 1062194975Sjilles /* 1063194975Sjilles * Save anything left as an argument. 1064194975Sjilles * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1065194975Sjilles * generating 2 arguments, the second of which is empty. 1066194975Sjilles * Some recent clarification of the Posix spec say that it 1067194975Sjilles * should only generate one.... 1068194975Sjilles */ 1069194975Sjilles if (had_param_ch || *start != 0) { 10701556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10711556Srgrimes sp->text = start; 10721556Srgrimes *arglist->lastp = sp; 10731556Srgrimes arglist->lastp = &sp->next; 10741556Srgrimes } 10751556Srgrimes} 10761556Srgrimes 10771556Srgrimes 10781556Srgrimes 10791556Srgrimes/* 10801556Srgrimes * Expand shell metacharacters. At this point, the only control characters 10811556Srgrimes * should be escapes. The results are stored in the list exparg. 10821556Srgrimes */ 10831556Srgrimes 1084211155SjillesSTATIC char expdir[PATH_MAX]; 1085211155Sjilles#define expdir_end (expdir + sizeof(expdir)) 10861556Srgrimes 10871556SrgrimesSTATIC void 108890111Simpexpandmeta(struct strlist *str, int flag __unused) 108917987Speter{ 10901556Srgrimes char *p; 10911556Srgrimes struct strlist **savelastp; 10921556Srgrimes struct strlist *sp; 10931556Srgrimes char c; 10941556Srgrimes /* TODO - EXP_REDIR */ 10951556Srgrimes 10961556Srgrimes while (str) { 10971556Srgrimes if (fflag) 10981556Srgrimes goto nometa; 10991556Srgrimes p = str->text; 11001556Srgrimes for (;;) { /* fast check for meta chars */ 11011556Srgrimes if ((c = *p++) == '\0') 11021556Srgrimes goto nometa; 1103211646Sjilles if (c == '*' || c == '?' || c == '[') 11041556Srgrimes break; 11051556Srgrimes } 11061556Srgrimes savelastp = exparg.lastp; 11071556Srgrimes INTOFF; 11081556Srgrimes expmeta(expdir, str->text); 11091556Srgrimes INTON; 11101556Srgrimes if (exparg.lastp == savelastp) { 11118855Srgrimes /* 11128855Srgrimes * no matches 11131556Srgrimes */ 11141556Srgrimesnometa: 11151556Srgrimes *exparg.lastp = str; 11161556Srgrimes rmescapes(str->text); 11171556Srgrimes exparg.lastp = &str->next; 11181556Srgrimes } else { 11191556Srgrimes *exparg.lastp = NULL; 11201556Srgrimes *savelastp = sp = expsort(*savelastp); 11211556Srgrimes while (sp->next != NULL) 11221556Srgrimes sp = sp->next; 11231556Srgrimes exparg.lastp = &sp->next; 11241556Srgrimes } 11251556Srgrimes str = str->next; 11261556Srgrimes } 11271556Srgrimes} 11281556Srgrimes 11291556Srgrimes 11301556Srgrimes/* 11311556Srgrimes * Do metacharacter (i.e. *, ?, [...]) expansion. 11321556Srgrimes */ 11331556Srgrimes 11341556SrgrimesSTATIC void 113590111Simpexpmeta(char *enddir, char *name) 113690111Simp{ 113725233Ssteve char *p; 11381556Srgrimes char *q; 11391556Srgrimes char *start; 11401556Srgrimes char *endname; 11411556Srgrimes int metaflag; 11421556Srgrimes struct stat statb; 11431556Srgrimes DIR *dirp; 11441556Srgrimes struct dirent *dp; 11451556Srgrimes int atend; 11461556Srgrimes int matchdot; 1147207944Sjilles int esc; 11481556Srgrimes 11491556Srgrimes metaflag = 0; 11501556Srgrimes start = name; 1151207944Sjilles for (p = name; esc = 0, *p; p += esc + 1) { 11521556Srgrimes if (*p == '*' || *p == '?') 11531556Srgrimes metaflag = 1; 11541556Srgrimes else if (*p == '[') { 11551556Srgrimes q = p + 1; 115626488Sache if (*q == '!' || *q == '^') 11571556Srgrimes q++; 11581556Srgrimes for (;;) { 115938887Stegge while (*q == CTLQUOTEMARK) 116038887Stegge q++; 11611556Srgrimes if (*q == CTLESC) 11621556Srgrimes q++; 11631556Srgrimes if (*q == '/' || *q == '\0') 11641556Srgrimes break; 11651556Srgrimes if (*++q == ']') { 11661556Srgrimes metaflag = 1; 11671556Srgrimes break; 11681556Srgrimes } 11691556Srgrimes } 11701556Srgrimes } else if (*p == '\0') 11711556Srgrimes break; 117238887Stegge else if (*p == CTLQUOTEMARK) 117338887Stegge continue; 1174207944Sjilles else { 1175207944Sjilles if (*p == CTLESC) 1176207944Sjilles esc++; 1177207944Sjilles if (p[esc] == '/') { 1178207944Sjilles if (metaflag) 1179207944Sjilles break; 1180207944Sjilles start = p + esc + 1; 1181207944Sjilles } 11821556Srgrimes } 11831556Srgrimes } 11841556Srgrimes if (metaflag == 0) { /* we've reached the end of the file name */ 11851556Srgrimes if (enddir != expdir) 11861556Srgrimes metaflag++; 11871556Srgrimes for (p = name ; ; p++) { 118838887Stegge if (*p == CTLQUOTEMARK) 118938887Stegge continue; 11901556Srgrimes if (*p == CTLESC) 11911556Srgrimes p++; 11921556Srgrimes *enddir++ = *p; 11931556Srgrimes if (*p == '\0') 11941556Srgrimes break; 1195211155Sjilles if (enddir == expdir_end) 1196211155Sjilles return; 11971556Srgrimes } 1198147812Sdelphij if (metaflag == 0 || lstat(expdir, &statb) >= 0) 11991556Srgrimes addfname(expdir); 12001556Srgrimes return; 12011556Srgrimes } 12021556Srgrimes endname = p; 12031556Srgrimes if (start != name) { 12041556Srgrimes p = name; 12051556Srgrimes while (p < start) { 120638887Stegge while (*p == CTLQUOTEMARK) 120738887Stegge p++; 12081556Srgrimes if (*p == CTLESC) 12091556Srgrimes p++; 12101556Srgrimes *enddir++ = *p++; 1211211155Sjilles if (enddir == expdir_end) 1212211155Sjilles return; 12131556Srgrimes } 12141556Srgrimes } 12151556Srgrimes if (enddir == expdir) { 12161556Srgrimes p = "."; 12171556Srgrimes } else if (enddir == expdir + 1 && *expdir == '/') { 12181556Srgrimes p = "/"; 12191556Srgrimes } else { 12201556Srgrimes p = expdir; 12211556Srgrimes enddir[-1] = '\0'; 12221556Srgrimes } 12231556Srgrimes if ((dirp = opendir(p)) == NULL) 12241556Srgrimes return; 12251556Srgrimes if (enddir != expdir) 12261556Srgrimes enddir[-1] = '/'; 12271556Srgrimes if (*endname == 0) { 12281556Srgrimes atend = 1; 12291556Srgrimes } else { 12301556Srgrimes atend = 0; 1231207944Sjilles *endname = '\0'; 1232207944Sjilles endname += esc + 1; 12331556Srgrimes } 12341556Srgrimes matchdot = 0; 123538887Stegge p = start; 123638887Stegge while (*p == CTLQUOTEMARK) 123738887Stegge p++; 123838887Stegge if (*p == CTLESC) 123938887Stegge p++; 124038887Stegge if (*p == '.') 12411556Srgrimes matchdot++; 12421556Srgrimes while (! int_pending() && (dp = readdir(dirp)) != NULL) { 12431556Srgrimes if (dp->d_name[0] == '.' && ! matchdot) 12441556Srgrimes continue; 124545514Stegge if (patmatch(start, dp->d_name, 0)) { 1246211155Sjilles if (enddir + dp->d_namlen + 1 > expdir_end) 1247211155Sjilles continue; 1248211155Sjilles memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1249211155Sjilles if (atend) 12501556Srgrimes addfname(expdir); 1251211155Sjilles else { 1252211155Sjilles if (enddir + dp->d_namlen + 2 > expdir_end) 125317987Speter continue; 1254211155Sjilles enddir[dp->d_namlen] = '/'; 1255211155Sjilles enddir[dp->d_namlen + 1] = '\0'; 1256211155Sjilles expmeta(enddir + dp->d_namlen + 1, endname); 12571556Srgrimes } 12581556Srgrimes } 12591556Srgrimes } 12601556Srgrimes closedir(dirp); 12611556Srgrimes if (! atend) 1262207944Sjilles endname[-esc - 1] = esc ? CTLESC : '/'; 12631556Srgrimes} 12641556Srgrimes 12651556Srgrimes 12661556Srgrimes/* 12671556Srgrimes * Add a file name to the list. 12681556Srgrimes */ 12691556Srgrimes 12701556SrgrimesSTATIC void 127190111Simpaddfname(char *name) 127290111Simp{ 12731556Srgrimes char *p; 12741556Srgrimes struct strlist *sp; 12751556Srgrimes 12761556Srgrimes p = stalloc(strlen(name) + 1); 12771556Srgrimes scopy(name, p); 12781556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 12791556Srgrimes sp->text = p; 12801556Srgrimes *exparg.lastp = sp; 12811556Srgrimes exparg.lastp = &sp->next; 12821556Srgrimes} 12831556Srgrimes 12841556Srgrimes 12851556Srgrimes/* 12861556Srgrimes * Sort the results of file name expansion. It calculates the number of 12871556Srgrimes * strings to sort and then calls msort (short for merge sort) to do the 12881556Srgrimes * work. 12891556Srgrimes */ 12901556Srgrimes 12911556SrgrimesSTATIC struct strlist * 129290111Simpexpsort(struct strlist *str) 129390111Simp{ 12941556Srgrimes int len; 12951556Srgrimes struct strlist *sp; 12961556Srgrimes 12971556Srgrimes len = 0; 12981556Srgrimes for (sp = str ; sp ; sp = sp->next) 12991556Srgrimes len++; 13001556Srgrimes return msort(str, len); 13011556Srgrimes} 13021556Srgrimes 13031556Srgrimes 13041556SrgrimesSTATIC struct strlist * 130590111Simpmsort(struct strlist *list, int len) 130617987Speter{ 130717987Speter struct strlist *p, *q = NULL; 13081556Srgrimes struct strlist **lpp; 13091556Srgrimes int half; 13101556Srgrimes int n; 13111556Srgrimes 13121556Srgrimes if (len <= 1) 13131556Srgrimes return list; 13148855Srgrimes half = len >> 1; 13151556Srgrimes p = list; 13161556Srgrimes for (n = half ; --n >= 0 ; ) { 13171556Srgrimes q = p; 13181556Srgrimes p = p->next; 13191556Srgrimes } 13201556Srgrimes q->next = NULL; /* terminate first half of list */ 13211556Srgrimes q = msort(list, half); /* sort first half of list */ 13221556Srgrimes p = msort(p, len - half); /* sort second half */ 13231556Srgrimes lpp = &list; 13241556Srgrimes for (;;) { 13251556Srgrimes if (strcmp(p->text, q->text) < 0) { 13261556Srgrimes *lpp = p; 13271556Srgrimes lpp = &p->next; 13281556Srgrimes if ((p = *lpp) == NULL) { 13291556Srgrimes *lpp = q; 13301556Srgrimes break; 13311556Srgrimes } 13321556Srgrimes } else { 13331556Srgrimes *lpp = q; 13341556Srgrimes lpp = &q->next; 13351556Srgrimes if ((q = *lpp) == NULL) { 13361556Srgrimes *lpp = p; 13371556Srgrimes break; 13381556Srgrimes } 13391556Srgrimes } 13401556Srgrimes } 13411556Srgrimes return list; 13421556Srgrimes} 13431556Srgrimes 13441556Srgrimes 13451556Srgrimes 13461556Srgrimes/* 13471556Srgrimes * Returns true if the pattern matches the string. 13481556Srgrimes */ 13491556Srgrimes 13501556Srgrimesint 1351200956Sjillespatmatch(const char *pattern, const char *string, int squoted) 135290111Simp{ 1353200956Sjilles const char *p, *q; 135425233Ssteve char c; 13551556Srgrimes 13561556Srgrimes p = pattern; 13571556Srgrimes q = string; 13581556Srgrimes for (;;) { 13591556Srgrimes switch (c = *p++) { 13601556Srgrimes case '\0': 13611556Srgrimes goto breakloop; 13621556Srgrimes case CTLESC: 136345514Stegge if (squoted && *q == CTLESC) 136445514Stegge q++; 13651556Srgrimes if (*q++ != *p++) 13661556Srgrimes return 0; 13671556Srgrimes break; 136838887Stegge case CTLQUOTEMARK: 136938887Stegge continue; 13701556Srgrimes case '?': 137145514Stegge if (squoted && *q == CTLESC) 137245514Stegge q++; 13731556Srgrimes if (*q++ == '\0') 13741556Srgrimes return 0; 13751556Srgrimes break; 13761556Srgrimes case '*': 13771556Srgrimes c = *p; 137838887Stegge while (c == CTLQUOTEMARK || c == '*') 137938887Stegge c = *++p; 138038887Stegge if (c != CTLESC && c != CTLQUOTEMARK && 138138887Stegge c != '?' && c != '*' && c != '[') { 13821556Srgrimes while (*q != c) { 138345514Stegge if (squoted && *q == CTLESC && 138445514Stegge q[1] == c) 138545514Stegge break; 13861556Srgrimes if (*q == '\0') 13871556Srgrimes return 0; 138845514Stegge if (squoted && *q == CTLESC) 138945514Stegge q++; 13901556Srgrimes q++; 13911556Srgrimes } 13921556Srgrimes } 13931556Srgrimes do { 1394211646Sjilles if (patmatch(p, q, squoted)) 13951556Srgrimes return 1; 139645514Stegge if (squoted && *q == CTLESC) 139745514Stegge q++; 13981556Srgrimes } while (*q++ != '\0'); 13991556Srgrimes return 0; 14001556Srgrimes case '[': { 1401200956Sjilles const char *endp; 14021556Srgrimes int invert, found; 14031556Srgrimes char chr; 14041556Srgrimes 14051556Srgrimes endp = p; 140626488Sache if (*endp == '!' || *endp == '^') 14071556Srgrimes endp++; 14081556Srgrimes for (;;) { 140938887Stegge while (*endp == CTLQUOTEMARK) 141038887Stegge endp++; 14111556Srgrimes if (*endp == '\0') 14121556Srgrimes goto dft; /* no matching ] */ 14131556Srgrimes if (*endp == CTLESC) 14141556Srgrimes endp++; 14151556Srgrimes if (*++endp == ']') 14161556Srgrimes break; 14171556Srgrimes } 14181556Srgrimes invert = 0; 141926488Sache if (*p == '!' || *p == '^') { 14201556Srgrimes invert++; 14211556Srgrimes p++; 14221556Srgrimes } 14231556Srgrimes found = 0; 14241556Srgrimes chr = *q++; 142545514Stegge if (squoted && chr == CTLESC) 142645514Stegge chr = *q++; 142717987Speter if (chr == '\0') 142817987Speter return 0; 14291556Srgrimes c = *p++; 14301556Srgrimes do { 143138887Stegge if (c == CTLQUOTEMARK) 143238887Stegge continue; 14331556Srgrimes if (c == CTLESC) 14341556Srgrimes c = *p++; 14351556Srgrimes if (*p == '-' && p[1] != ']') { 14361556Srgrimes p++; 143738887Stegge while (*p == CTLQUOTEMARK) 143838887Stegge p++; 14391556Srgrimes if (*p == CTLESC) 14401556Srgrimes p++; 144117557Sache if ( collate_range_cmp(chr, c) >= 0 144217557Sache && collate_range_cmp(chr, *p) <= 0 144317525Sache ) 14441556Srgrimes found = 1; 14451556Srgrimes p++; 14461556Srgrimes } else { 14471556Srgrimes if (chr == c) 14481556Srgrimes found = 1; 14491556Srgrimes } 14501556Srgrimes } while ((c = *p++) != ']'); 14511556Srgrimes if (found == invert) 14521556Srgrimes return 0; 14531556Srgrimes break; 14541556Srgrimes } 14551556Srgrimesdft: default: 145645514Stegge if (squoted && *q == CTLESC) 145745514Stegge q++; 14581556Srgrimes if (*q++ != c) 14591556Srgrimes return 0; 14601556Srgrimes break; 14611556Srgrimes } 14621556Srgrimes } 14631556Srgrimesbreakloop: 14641556Srgrimes if (*q != '\0') 14651556Srgrimes return 0; 14661556Srgrimes return 1; 14671556Srgrimes} 14681556Srgrimes 14691556Srgrimes 14701556Srgrimes 14711556Srgrimes/* 14721556Srgrimes * Remove any CTLESC characters from a string. 14731556Srgrimes */ 14741556Srgrimes 14751556Srgrimesvoid 147690111Simprmescapes(char *str) 147738887Stegge{ 147825233Ssteve char *p, *q; 14791556Srgrimes 14801556Srgrimes p = str; 148138887Stegge while (*p != CTLESC && *p != CTLQUOTEMARK) { 14821556Srgrimes if (*p++ == '\0') 14831556Srgrimes return; 14841556Srgrimes } 14851556Srgrimes q = p; 14861556Srgrimes while (*p) { 148738887Stegge if (*p == CTLQUOTEMARK) { 148838887Stegge p++; 148938887Stegge continue; 149038887Stegge } 14911556Srgrimes if (*p == CTLESC) 14921556Srgrimes p++; 14931556Srgrimes *q++ = *p++; 14941556Srgrimes } 14951556Srgrimes *q = '\0'; 14961556Srgrimes} 14971556Srgrimes 14981556Srgrimes 14991556Srgrimes 15001556Srgrimes/* 15011556Srgrimes * See if a pattern matches in a case statement. 15021556Srgrimes */ 15031556Srgrimes 15041556Srgrimesint 1505200956Sjillescasematch(union node *pattern, const char *val) 150690111Simp{ 15071556Srgrimes struct stackmark smark; 15081556Srgrimes int result; 15091556Srgrimes char *p; 15101556Srgrimes 15111556Srgrimes setstackmark(&smark); 15121556Srgrimes argbackq = pattern->narg.backquote; 15131556Srgrimes STARTSTACKSTR(expdest); 15141556Srgrimes ifslastp = NULL; 15151556Srgrimes argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 15161556Srgrimes STPUTC('\0', expdest); 15171556Srgrimes p = grabstackstr(expdest); 151845514Stegge result = patmatch(p, val, 0); 15191556Srgrimes popstackmark(&smark); 15201556Srgrimes return result; 15211556Srgrimes} 152217987Speter 152317987Speter/* 152417987Speter * Our own itoa(). 152517987Speter */ 152617987Speter 152717987SpeterSTATIC char * 152890111Simpcvtnum(int num, char *buf) 152990111Simp{ 153017987Speter char temp[32]; 153117987Speter int neg = num < 0; 153217987Speter char *p = temp + 31; 153317987Speter 153417987Speter temp[31] = '\0'; 153517987Speter 153617987Speter do { 153717987Speter *--p = num % 10 + '0'; 153817987Speter } while ((num /= 10) != 0); 153917987Speter 154017987Speter if (neg) 154117987Speter *--p = '-'; 154217987Speter 154317987Speter while (*p) 154417987Speter STPUTC(*p++, buf); 154517987Speter return buf; 154617987Speter} 1547108286Stjr 1548108286Stjr/* 1549108286Stjr * Do most of the work for wordexp(3). 1550108286Stjr */ 1551108286Stjr 1552108286Stjrint 1553108286Stjrwordexpcmd(int argc, char **argv) 1554108286Stjr{ 1555108286Stjr size_t len; 1556108286Stjr int i; 1557108286Stjr 1558108286Stjr out1fmt("%08x", argc - 1); 1559108286Stjr for (i = 1, len = 0; i < argc; i++) 1560108286Stjr len += strlen(argv[i]); 1561108286Stjr out1fmt("%08x", (int)len); 1562108286Stjr for (i = 1; i < argc; i++) { 1563108286Stjr out1str(argv[i]); 1564108286Stjr out1c('\0'); 1565108286Stjr } 1566108286Stjr return (0); 1567108286Stjr} 1568