expand.c revision 164003
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/expand.c 164003 2006-11-05 18:36:05Z stefanf $"); 401556Srgrimes 4117987Speter#include <sys/types.h> 4217987Speter#include <sys/time.h> 4317987Speter#include <sys/stat.h> 4417987Speter#include <errno.h> 4517987Speter#include <dirent.h> 4617987Speter#include <unistd.h> 4717987Speter#include <pwd.h> 4817987Speter#include <stdlib.h> 4919281Sache#include <limits.h> 5038887Stegge#include <stdio.h> 51108286Stjr#include <string.h> 5217987Speter 531556Srgrimes/* 541556Srgrimes * Routines to expand arguments to commands. We have to deal with 551556Srgrimes * backquotes, shell variables, and file metacharacters. 561556Srgrimes */ 571556Srgrimes 581556Srgrimes#include "shell.h" 591556Srgrimes#include "main.h" 601556Srgrimes#include "nodes.h" 611556Srgrimes#include "eval.h" 621556Srgrimes#include "expand.h" 631556Srgrimes#include "syntax.h" 641556Srgrimes#include "parser.h" 651556Srgrimes#include "jobs.h" 661556Srgrimes#include "options.h" 671556Srgrimes#include "var.h" 681556Srgrimes#include "input.h" 691556Srgrimes#include "output.h" 701556Srgrimes#include "memalloc.h" 711556Srgrimes#include "error.h" 721556Srgrimes#include "mystring.h" 7317987Speter#include "arith.h" 7417987Speter#include "show.h" 751556Srgrimes 761556Srgrimes/* 771556Srgrimes * Structure specifying which parts of the string should be searched 781556Srgrimes * for IFS characters. 791556Srgrimes */ 801556Srgrimes 811556Srgrimesstruct ifsregion { 821556Srgrimes struct ifsregion *next; /* next region in list */ 831556Srgrimes int begoff; /* offset of start of region */ 841556Srgrimes int endoff; /* offset of end of region */ 851556Srgrimes int nulonly; /* search for nul bytes only */ 861556Srgrimes}; 871556Srgrimes 881556Srgrimes 89117261SddsSTATIC char *expdest; /* output of current string */ 90117261SddsSTATIC struct nodelist *argbackq; /* list of back quote expressions */ 91117261SddsSTATIC struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 92117261SddsSTATIC struct ifsregion *ifslastp; /* last struct in list */ 93117261SddsSTATIC struct arglist exparg; /* holds expanded arg list */ 941556Srgrimes 9590111SimpSTATIC void argstr(char *, int); 9690111SimpSTATIC char *exptilde(char *, int); 9790111SimpSTATIC void expbackq(union node *, int, int); 9890111SimpSTATIC int subevalvar(char *, char *, int, int, int, int); 9990111SimpSTATIC char *evalvar(char *, int); 10090111SimpSTATIC int varisset(char *, int); 10190111SimpSTATIC void varvalue(char *, int, int); 10290111SimpSTATIC void recordregion(int, int, int); 103155301SschweikhSTATIC void removerecordregions(int); 10490111SimpSTATIC void ifsbreakup(char *, struct arglist *); 10590111SimpSTATIC void expandmeta(struct strlist *, int); 10690111SimpSTATIC void expmeta(char *, char *); 10790111SimpSTATIC void addfname(char *); 10890111SimpSTATIC struct strlist *expsort(struct strlist *); 10990111SimpSTATIC struct strlist *msort(struct strlist *, int); 11090111SimpSTATIC int pmatch(char *, char *, int); 11190111SimpSTATIC char *cvtnum(int, char *); 11290111SimpSTATIC int collate_range_cmp(int, int); 1131556Srgrimes 11490111SimpSTATIC int 115118374Sachecollate_range_cmp(int c1, int c2) 11619281Sache{ 11719281Sache static char s1[2], s2[2]; 11819281Sache 11919281Sache s1[0] = c1; 12019281Sache s2[0] = c2; 121118374Sache return (strcoll(s1, s2)); 12219281Sache} 12319281Sache 1241556Srgrimes/* 1251556Srgrimes * Expand shell variables and backquotes inside a here document. 12690111Simp * union node *arg the document 12790111Simp * int fd; where to write the expanded version 1281556Srgrimes */ 1291556Srgrimes 1301556Srgrimesvoid 13190111Simpexpandhere(union node *arg, int fd) 13290111Simp{ 1331556Srgrimes herefd = fd; 1341556Srgrimes expandarg(arg, (struct arglist *)NULL, 0); 13539137Stegge xwrite(fd, stackblock(), expdest - stackblock()); 1361556Srgrimes} 1371556Srgrimes 1381556Srgrimes 1391556Srgrimes/* 1401556Srgrimes * Perform variable substitution and command substitution on an argument, 1411556Srgrimes * placing the resulting list of arguments in arglist. If EXP_FULL is true, 1421556Srgrimes * perform splitting and file name expansion. When arglist is NULL, perform 1431556Srgrimes * here document expansion. 1441556Srgrimes */ 1451556Srgrimes 1461556Srgrimesvoid 14790111Simpexpandarg(union node *arg, struct arglist *arglist, int flag) 14817987Speter{ 1491556Srgrimes struct strlist *sp; 1501556Srgrimes char *p; 1511556Srgrimes 1521556Srgrimes argbackq = arg->narg.backquote; 1531556Srgrimes STARTSTACKSTR(expdest); 1541556Srgrimes ifsfirst.next = NULL; 1551556Srgrimes ifslastp = NULL; 1561556Srgrimes argstr(arg->narg.text, flag); 1571556Srgrimes if (arglist == NULL) { 1581556Srgrimes return; /* here document expanded */ 1591556Srgrimes } 1601556Srgrimes STPUTC('\0', expdest); 1611556Srgrimes p = grabstackstr(expdest); 1621556Srgrimes exparg.lastp = &exparg.list; 1631556Srgrimes /* 1641556Srgrimes * TODO - EXP_REDIR 1651556Srgrimes */ 1661556Srgrimes if (flag & EXP_FULL) { 1671556Srgrimes ifsbreakup(p, &exparg); 1681556Srgrimes *exparg.lastp = NULL; 1691556Srgrimes exparg.lastp = &exparg.list; 1701556Srgrimes expandmeta(exparg.list, flag); 1711556Srgrimes } else { 1721556Srgrimes if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 1731556Srgrimes rmescapes(p); 1741556Srgrimes sp = (struct strlist *)stalloc(sizeof (struct strlist)); 1751556Srgrimes sp->text = p; 1761556Srgrimes *exparg.lastp = sp; 1771556Srgrimes exparg.lastp = &sp->next; 1781556Srgrimes } 1791556Srgrimes while (ifsfirst.next != NULL) { 1801556Srgrimes struct ifsregion *ifsp; 1811556Srgrimes INTOFF; 1821556Srgrimes ifsp = ifsfirst.next->next; 1831556Srgrimes ckfree(ifsfirst.next); 1841556Srgrimes ifsfirst.next = ifsp; 1851556Srgrimes INTON; 1861556Srgrimes } 1871556Srgrimes *exparg.lastp = NULL; 1881556Srgrimes if (exparg.list) { 1891556Srgrimes *arglist->lastp = exparg.list; 1901556Srgrimes arglist->lastp = exparg.lastp; 1911556Srgrimes } 1921556Srgrimes} 1931556Srgrimes 1941556Srgrimes 1951556Srgrimes 1961556Srgrimes/* 1971556Srgrimes * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 1981556Srgrimes * characters to allow for further processing. Otherwise treat 1991556Srgrimes * $@ like $* since no splitting will be performed. 2001556Srgrimes */ 2011556Srgrimes 2021556SrgrimesSTATIC void 20390111Simpargstr(char *p, int flag) 20417987Speter{ 20525233Ssteve char c; 206104672Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 2071556Srgrimes int firsteq = 1; 2081556Srgrimes 2091556Srgrimes if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 2101556Srgrimes p = exptilde(p, flag); 2111556Srgrimes for (;;) { 2121556Srgrimes switch (c = *p++) { 2131556Srgrimes case '\0': 2141556Srgrimes case CTLENDVAR: /* ??? */ 2151556Srgrimes goto breakloop; 21638887Stegge case CTLQUOTEMARK: 21738887Stegge /* "$@" syntax adherence hack */ 21838887Stegge if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 21938887Stegge break; 22039137Stegge if ((flag & EXP_FULL) != 0) 22139137Stegge STPUTC(c, expdest); 22238887Stegge break; 2231556Srgrimes case CTLESC: 2241556Srgrimes if (quotes) 2251556Srgrimes STPUTC(c, expdest); 2261556Srgrimes c = *p++; 2271556Srgrimes STPUTC(c, expdest); 2281556Srgrimes break; 2291556Srgrimes case CTLVAR: 2301556Srgrimes p = evalvar(p, flag); 2311556Srgrimes break; 2321556Srgrimes case CTLBACKQ: 2331556Srgrimes case CTLBACKQ|CTLQUOTE: 2341556Srgrimes expbackq(argbackq->n, c & CTLQUOTE, flag); 2351556Srgrimes argbackq = argbackq->next; 2361556Srgrimes break; 2371556Srgrimes case CTLENDARI: 2381556Srgrimes expari(flag); 2391556Srgrimes break; 2401556Srgrimes case ':': 2411556Srgrimes case '=': 2421556Srgrimes /* 2431556Srgrimes * sort of a hack - expand tildes in variable 2441556Srgrimes * assignments (after the first '=' and after ':'s). 2451556Srgrimes */ 2461556Srgrimes STPUTC(c, expdest); 2471556Srgrimes if (flag & EXP_VARTILDE && *p == '~') { 2481556Srgrimes if (c == '=') { 2491556Srgrimes if (firsteq) 2501556Srgrimes firsteq = 0; 2511556Srgrimes else 2521556Srgrimes break; 2531556Srgrimes } 2541556Srgrimes p = exptilde(p, flag); 2551556Srgrimes } 2561556Srgrimes break; 2571556Srgrimes default: 2581556Srgrimes STPUTC(c, expdest); 2591556Srgrimes } 2601556Srgrimes } 2611556Srgrimesbreakloop:; 2621556Srgrimes} 2631556Srgrimes 2641556SrgrimesSTATIC char * 26590111Simpexptilde(char *p, int flag) 26617987Speter{ 2671556Srgrimes char c, *startp = p; 2681556Srgrimes struct passwd *pw; 2691556Srgrimes char *home; 270108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 2711556Srgrimes 27217987Speter while ((c = *p) != '\0') { 2731556Srgrimes switch(c) { 2741556Srgrimes case CTLESC: 2751556Srgrimes return (startp); 27639137Stegge case CTLQUOTEMARK: 27739137Stegge return (startp); 2781556Srgrimes case ':': 2791556Srgrimes if (flag & EXP_VARTILDE) 2801556Srgrimes goto done; 2811556Srgrimes break; 2821556Srgrimes case '/': 2831556Srgrimes goto done; 2841556Srgrimes } 2851556Srgrimes p++; 2861556Srgrimes } 2871556Srgrimesdone: 2881556Srgrimes *p = '\0'; 2891556Srgrimes if (*(startp+1) == '\0') { 2901556Srgrimes if ((home = lookupvar("HOME")) == NULL) 2911556Srgrimes goto lose; 2921556Srgrimes } else { 2931556Srgrimes if ((pw = getpwnam(startp+1)) == NULL) 2941556Srgrimes goto lose; 2951556Srgrimes home = pw->pw_dir; 2961556Srgrimes } 2971556Srgrimes if (*home == '\0') 2981556Srgrimes goto lose; 2991556Srgrimes *p = c; 30017987Speter while ((c = *home++) != '\0') { 30183675Stegge if (quotes && SQSYNTAX[(int)c] == CCTL) 3021556Srgrimes STPUTC(CTLESC, expdest); 3031556Srgrimes STPUTC(c, expdest); 3041556Srgrimes } 3051556Srgrimes return (p); 3061556Srgrimeslose: 3071556Srgrimes *p = c; 3081556Srgrimes return (startp); 3091556Srgrimes} 3101556Srgrimes 3111556Srgrimes 312155301SschweikhSTATIC void 31390111Simpremoverecordregions(int endoff) 31438887Stegge{ 31538887Stegge if (ifslastp == NULL) 31638887Stegge return; 31738887Stegge 31838887Stegge if (ifsfirst.endoff > endoff) { 31938887Stegge while (ifsfirst.next != NULL) { 32038887Stegge struct ifsregion *ifsp; 32138887Stegge INTOFF; 32238887Stegge ifsp = ifsfirst.next->next; 32338887Stegge ckfree(ifsfirst.next); 32438887Stegge ifsfirst.next = ifsp; 32538887Stegge INTON; 32638887Stegge } 32738887Stegge if (ifsfirst.begoff > endoff) 32838887Stegge ifslastp = NULL; 32938887Stegge else { 33038887Stegge ifslastp = &ifsfirst; 33138887Stegge ifsfirst.endoff = endoff; 33238887Stegge } 33338887Stegge return; 33438887Stegge } 335155301Sschweikh 33638887Stegge ifslastp = &ifsfirst; 33738887Stegge while (ifslastp->next && ifslastp->next->begoff < endoff) 33838887Stegge ifslastp=ifslastp->next; 33938887Stegge while (ifslastp->next != NULL) { 34038887Stegge struct ifsregion *ifsp; 34138887Stegge INTOFF; 34238887Stegge ifsp = ifslastp->next->next; 34338887Stegge ckfree(ifslastp->next); 34438887Stegge ifslastp->next = ifsp; 34538887Stegge INTON; 34638887Stegge } 34738887Stegge if (ifslastp->endoff > endoff) 34838887Stegge ifslastp->endoff = endoff; 34938887Stegge} 35038887Stegge 3511556Srgrimes/* 3521556Srgrimes * Expand arithmetic expression. Backup to start of expression, 3531556Srgrimes * evaluate, place result in (backed up) result, adjust string position. 3541556Srgrimes */ 3551556Srgrimesvoid 35690111Simpexpari(int flag) 35717987Speter{ 3581556Srgrimes char *p, *start; 3591556Srgrimes int result; 36038887Stegge int begoff; 361108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 36238887Stegge int quoted; 3631556Srgrimes 36425233Ssteve 3651556Srgrimes /* 36646684Skris * This routine is slightly over-complicated for 3671556Srgrimes * efficiency. First we make sure there is 3681556Srgrimes * enough space for the result, which may be bigger 36946684Skris * than the expression if we add exponentiation. Next we 3701556Srgrimes * scan backwards looking for the start of arithmetic. If the 3711556Srgrimes * next previous character is a CTLESC character, then we 3721556Srgrimes * have to rescan starting from the beginning since CTLESC 3738855Srgrimes * characters have to be processed left to right. 3741556Srgrimes */ 37522777Ssteve#if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10 37622777Ssteve#error "integers with more than 10 digits are not supported" 37722777Ssteve#endif 37822777Ssteve CHECKSTRSPACE(12 - 2, expdest); 3798855Srgrimes USTPUTC('\0', expdest); 3801556Srgrimes start = stackblock(); 38183676Stegge p = expdest - 2; 38283676Stegge while (p >= start && *p != CTLARI) 3831556Srgrimes --p; 38483676Stegge if (p < start || *p != CTLARI) 3851556Srgrimes error("missing CTLARI (shouldn't happen)"); 38683676Stegge if (p > start && *(p - 1) == CTLESC) 3871556Srgrimes for (p = start; *p != CTLARI; p++) 3881556Srgrimes if (*p == CTLESC) 3891556Srgrimes p++; 39038887Stegge 39138887Stegge if (p[1] == '"') 39238887Stegge quoted=1; 39338887Stegge else 39438887Stegge quoted=0; 39538887Stegge begoff = p - start; 39638887Stegge removerecordregions(begoff); 3971556Srgrimes if (quotes) 39838887Stegge rmescapes(p+2); 39938887Stegge result = arith(p+2); 40022777Ssteve fmtstr(p, 12, "%d", result); 4011556Srgrimes while (*p++) 4021556Srgrimes ; 40338887Stegge if (quoted == 0) 40438887Stegge recordregion(begoff, p - 1 - start, 0); 4051556Srgrimes result = expdest - p + 1; 4061556Srgrimes STADJUST(-result, expdest); 4071556Srgrimes} 4081556Srgrimes 4091556Srgrimes 4101556Srgrimes/* 4111556Srgrimes * Expand stuff in backwards quotes. 4121556Srgrimes */ 4131556Srgrimes 4141556SrgrimesSTATIC void 41590111Simpexpbackq(union node *cmd, int quoted, int flag) 41617987Speter{ 4171556Srgrimes struct backcmd in; 4181556Srgrimes int i; 4191556Srgrimes char buf[128]; 4201556Srgrimes char *p; 4211556Srgrimes char *dest = expdest; 4221556Srgrimes struct ifsregion saveifs, *savelastp; 4231556Srgrimes struct nodelist *saveargbackq; 4241556Srgrimes char lastc; 4251556Srgrimes int startloc = dest - stackblock(); 4261556Srgrimes char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 4271556Srgrimes int saveherefd; 428108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 429115424Sfenner int nnl; 4301556Srgrimes 4311556Srgrimes INTOFF; 4321556Srgrimes saveifs = ifsfirst; 4331556Srgrimes savelastp = ifslastp; 4341556Srgrimes saveargbackq = argbackq; 4358855Srgrimes saveherefd = herefd; 4361556Srgrimes herefd = -1; 4371556Srgrimes p = grabstackstr(dest); 4381556Srgrimes evalbackcmd(cmd, &in); 4391556Srgrimes ungrabstackstr(p, dest); 4401556Srgrimes ifsfirst = saveifs; 4411556Srgrimes ifslastp = savelastp; 4421556Srgrimes argbackq = saveargbackq; 4431556Srgrimes herefd = saveherefd; 4441556Srgrimes 4451556Srgrimes p = in.buf; 4461556Srgrimes lastc = '\0'; 447115424Sfenner nnl = 0; 448115424Sfenner /* Don't copy trailing newlines */ 4491556Srgrimes for (;;) { 4501556Srgrimes if (--in.nleft < 0) { 4511556Srgrimes if (in.fd < 0) 4521556Srgrimes break; 4531556Srgrimes while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 4541556Srgrimes TRACE(("expbackq: read returns %d\n", i)); 4551556Srgrimes if (i <= 0) 4561556Srgrimes break; 4571556Srgrimes p = buf; 4581556Srgrimes in.nleft = i - 1; 4591556Srgrimes } 4601556Srgrimes lastc = *p++; 4611556Srgrimes if (lastc != '\0') { 46283675Stegge if (quotes && syntax[(int)lastc] == CCTL) 4631556Srgrimes STPUTC(CTLESC, dest); 464115424Sfenner if (lastc == '\n') { 465115424Sfenner nnl++; 466115424Sfenner } else { 467115424Sfenner while (nnl > 0) { 468115424Sfenner nnl--; 469115424Sfenner STPUTC('\n', dest); 470115424Sfenner } 471115424Sfenner STPUTC(lastc, dest); 472115424Sfenner } 4731556Srgrimes } 4741556Srgrimes } 47517987Speter 4761556Srgrimes if (in.fd >= 0) 4771556Srgrimes close(in.fd); 4781556Srgrimes if (in.buf) 4791556Srgrimes ckfree(in.buf); 4801556Srgrimes if (in.jp) 48145916Scracauer exitstatus = waitforjob(in.jp, (int *)NULL); 4821556Srgrimes if (quoted == 0) 4831556Srgrimes recordregion(startloc, dest - stackblock(), 0); 4841556Srgrimes TRACE(("evalbackq: size=%d: \"%.*s\"\n", 4851556Srgrimes (dest - stackblock()) - startloc, 4861556Srgrimes (dest - stackblock()) - startloc, 4871556Srgrimes stackblock() + startloc)); 4881556Srgrimes expdest = dest; 4891556Srgrimes INTON; 4901556Srgrimes} 4911556Srgrimes 4921556Srgrimes 4931556Srgrimes 49417987SpeterSTATIC int 49590111Simpsubevalvar(char *p, char *str, int strloc, int subtype, int startloc, 49690111Simp int varflags) 49717987Speter{ 49817987Speter char *startp; 49917987Speter char *loc = NULL; 50045514Stegge char *q; 50117987Speter int c = 0; 50217987Speter int saveherefd = herefd; 50317987Speter struct nodelist *saveargbackq = argbackq; 50420425Ssteve int amount; 50520425Ssteve 50617987Speter herefd = -1; 50717987Speter argstr(p, 0); 50817987Speter STACKSTRNUL(expdest); 50917987Speter herefd = saveherefd; 51017987Speter argbackq = saveargbackq; 51117987Speter startp = stackblock() + startloc; 51220425Ssteve if (str == NULL) 51320425Ssteve str = stackblock() + strloc; 51417987Speter 51517987Speter switch (subtype) { 51617987Speter case VSASSIGN: 51717987Speter setvar(str, startp, 0); 51820425Ssteve amount = startp - expdest; 51920425Ssteve STADJUST(amount, expdest); 52017987Speter varflags &= ~VSNUL; 52117987Speter if (c != 0) 52217987Speter *loc = c; 52317987Speter return 1; 52417987Speter 52517987Speter case VSQUESTION: 52617987Speter if (*p != CTLENDVAR) { 52717987Speter outfmt(&errout, "%s\n", startp); 52817987Speter error((char *)NULL); 52917987Speter } 530112254Sru error("%.*s: parameter %snot set", (int)(p - str - 1), 53117987Speter str, (varflags & VSNUL) ? "null or " 53217987Speter : nullstr); 53317987Speter return 0; 53417987Speter 53517987Speter case VSTRIMLEFT: 53625233Ssteve for (loc = startp; loc < str; loc++) { 53717987Speter c = *loc; 53817987Speter *loc = '\0'; 53945514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 54017987Speter *loc = c; 54117987Speter goto recordleft; 54217987Speter } 54317987Speter *loc = c; 54445514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 54545514Stegge loc++; 54617987Speter } 54717987Speter return 0; 54817987Speter 54917987Speter case VSTRIMLEFTMAX: 55045514Stegge for (loc = str - 1; loc >= startp;) { 55117987Speter c = *loc; 55217987Speter *loc = '\0'; 55345514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 55417987Speter *loc = c; 55517987Speter goto recordleft; 55617987Speter } 55717987Speter *loc = c; 55845514Stegge loc--; 55945514Stegge if ((varflags & VSQUOTE) && loc > startp && 56045514Stegge *(loc - 1) == CTLESC) { 56145514Stegge for (q = startp; q < loc; q++) 56245514Stegge if (*q == CTLESC) 56345514Stegge q++; 56445514Stegge if (q > loc) 56545514Stegge loc--; 56645514Stegge } 56717987Speter } 56817987Speter return 0; 56917987Speter 57017987Speter case VSTRIMRIGHT: 57145514Stegge for (loc = str - 1; loc >= startp;) { 57245514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 57320425Ssteve amount = loc - expdest; 57420425Ssteve STADJUST(amount, expdest); 57517987Speter return 1; 57617987Speter } 57745514Stegge loc--; 57845514Stegge if ((varflags & VSQUOTE) && loc > startp && 579155301Sschweikh *(loc - 1) == CTLESC) { 58045514Stegge for (q = startp; q < loc; q++) 58145514Stegge if (*q == CTLESC) 58245514Stegge q++; 58345514Stegge if (q > loc) 58445514Stegge loc--; 58545514Stegge } 58617987Speter } 58717987Speter return 0; 58817987Speter 58917987Speter case VSTRIMRIGHTMAX: 59017987Speter for (loc = startp; loc < str - 1; loc++) { 59145514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 59220425Ssteve amount = loc - expdest; 59320425Ssteve STADJUST(amount, expdest); 59417987Speter return 1; 59517987Speter } 59645514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 59745514Stegge loc++; 59817987Speter } 59917987Speter return 0; 60017987Speter 60117987Speter 60217987Speter default: 60317987Speter abort(); 60417987Speter } 60517987Speter 60617987Speterrecordleft: 60720425Ssteve amount = ((str - 1) - (loc - startp)) - expdest; 60820425Ssteve STADJUST(amount, expdest); 60917987Speter while (loc != str - 1) 61017987Speter *startp++ = *loc++; 61117987Speter return 1; 61217987Speter} 61317987Speter 61417987Speter 6151556Srgrimes/* 6161556Srgrimes * Expand a variable, and return a pointer to the next character in the 6171556Srgrimes * input string. 6181556Srgrimes */ 6191556Srgrimes 6201556SrgrimesSTATIC char * 62190111Simpevalvar(char *p, int flag) 62217987Speter{ 6231556Srgrimes int subtype; 6241556Srgrimes int varflags; 6251556Srgrimes char *var; 6261556Srgrimes char *val; 62745644Stegge int patloc; 6281556Srgrimes int c; 6291556Srgrimes int set; 6301556Srgrimes int special; 6311556Srgrimes int startloc; 63217987Speter int varlen; 63317987Speter int easy; 634108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 6351556Srgrimes 6361556Srgrimes varflags = *p++; 6371556Srgrimes subtype = varflags & VSTYPE; 6381556Srgrimes var = p; 6391556Srgrimes special = 0; 6401556Srgrimes if (! is_name(*p)) 6411556Srgrimes special = 1; 6421556Srgrimes p = strchr(p, '=') + 1; 6431556Srgrimesagain: /* jump here after setting a variable with ${var=text} */ 6441556Srgrimes if (special) { 64525233Ssteve set = varisset(var, varflags & VSNUL); 6461556Srgrimes val = NULL; 6471556Srgrimes } else { 64860592Scracauer val = bltinlookup(var, 1); 64917987Speter if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 6501556Srgrimes val = NULL; 6511556Srgrimes set = 0; 6521556Srgrimes } else 6531556Srgrimes set = 1; 6541556Srgrimes } 65517987Speter varlen = 0; 6561556Srgrimes startloc = expdest - stackblock(); 65796939Stjr if (!set && uflag) { 65896939Stjr switch (subtype) { 65996939Stjr case VSNORMAL: 66096939Stjr case VSTRIMLEFT: 66196939Stjr case VSTRIMLEFTMAX: 66296939Stjr case VSTRIMRIGHT: 66396939Stjr case VSTRIMRIGHTMAX: 66496939Stjr case VSLENGTH: 665112254Sru error("%.*s: parameter not set", (int)(p - var - 1), 666112254Sru var); 66796939Stjr } 66896939Stjr } 6691556Srgrimes if (set && subtype != VSPLUS) { 6701556Srgrimes /* insert the value of the variable */ 6711556Srgrimes if (special) { 67218202Speter varvalue(var, varflags & VSQUOTE, flag & EXP_FULL); 67317987Speter if (subtype == VSLENGTH) { 67425233Ssteve varlen = expdest - stackblock() - startloc; 67525233Ssteve STADJUST(-varlen, expdest); 67617987Speter } 6771556Srgrimes } else { 67820425Ssteve char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 67917987Speter : BASESYNTAX; 6801556Srgrimes 68117987Speter if (subtype == VSLENGTH) { 68217987Speter for (;*val; val++) 68317987Speter varlen++; 6841556Srgrimes } 68517987Speter else { 68617987Speter while (*val) { 68783675Stegge if (quotes && 68854132Scracauer syntax[(int)*val] == CCTL) 68917987Speter STPUTC(CTLESC, expdest); 69017987Speter STPUTC(*val++, expdest); 69117987Speter } 69217987Speter 69317987Speter } 6941556Srgrimes } 6951556Srgrimes } 69620425Ssteve 6971556Srgrimes if (subtype == VSPLUS) 6981556Srgrimes set = ! set; 69917987Speter 70020425Ssteve easy = ((varflags & VSQUOTE) == 0 || 70117987Speter (*var == '@' && shellparam.nparam != 1)); 70217987Speter 70317987Speter 70417987Speter switch (subtype) { 70517987Speter case VSLENGTH: 70617987Speter expdest = cvtnum(varlen, expdest); 70717987Speter goto record; 70817987Speter 70917987Speter case VSNORMAL: 71017987Speter if (!easy) 71117987Speter break; 71217987Speterrecord: 71320425Ssteve recordregion(startloc, expdest - stackblock(), 71417987Speter varflags & VSQUOTE); 71517987Speter break; 71617987Speter 71717987Speter case VSPLUS: 71817987Speter case VSMINUS: 71917987Speter if (!set) { 7201556Srgrimes argstr(p, flag); 72117987Speter break; 72217987Speter } 72317987Speter if (easy) 72417987Speter goto record; 72517987Speter break; 72617987Speter 72717987Speter case VSTRIMLEFT: 72817987Speter case VSTRIMLEFTMAX: 72917987Speter case VSTRIMRIGHT: 73017987Speter case VSTRIMRIGHTMAX: 73117987Speter if (!set) 73217987Speter break; 73317987Speter /* 73417987Speter * Terminate the string and start recording the pattern 73517987Speter * right after it 73617987Speter */ 73717987Speter STPUTC('\0', expdest); 73845644Stegge patloc = expdest - stackblock(); 73945644Stegge if (subevalvar(p, NULL, patloc, subtype, 74038887Stegge startloc, varflags) == 0) { 74145644Stegge int amount = (expdest - stackblock() - patloc) + 1; 74225233Ssteve STADJUST(-amount, expdest); 74325233Ssteve } 74438887Stegge /* Remove any recorded regions beyond start of variable */ 74538887Stegge removerecordregions(startloc); 74638887Stegge goto record; 74717987Speter 74817987Speter case VSASSIGN: 74917987Speter case VSQUESTION: 75017987Speter if (!set) { 75120425Ssteve if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 75220425Ssteve varflags &= ~VSNUL; 753155301Sschweikh /* 754155301Sschweikh * Remove any recorded regions beyond 755155301Sschweikh * start of variable 75638887Stegge */ 75738887Stegge removerecordregions(startloc); 7581556Srgrimes goto again; 75920425Ssteve } 76017987Speter break; 7611556Srgrimes } 76217987Speter if (easy) 76317987Speter goto record; 76417987Speter break; 76517987Speter 766164003Sstefanf case VSERROR: 767164003Sstefanf c = p - var - 1; 768164003Sstefanf error("${%.*s%s}: Bad substitution", c, var, 769164003Sstefanf (c > 0 && *p != CTLENDVAR) ? "..." : ""); 770164003Sstefanf 77117987Speter default: 77217987Speter abort(); 7731556Srgrimes } 77417987Speter 7751556Srgrimes if (subtype != VSNORMAL) { /* skip to end of alternative */ 7761556Srgrimes int nesting = 1; 7771556Srgrimes for (;;) { 7781556Srgrimes if ((c = *p++) == CTLESC) 7791556Srgrimes p++; 7801556Srgrimes else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 7811556Srgrimes if (set) 7821556Srgrimes argbackq = argbackq->next; 7831556Srgrimes } else if (c == CTLVAR) { 7841556Srgrimes if ((*p++ & VSTYPE) != VSNORMAL) 7851556Srgrimes nesting++; 7861556Srgrimes } else if (c == CTLENDVAR) { 7871556Srgrimes if (--nesting == 0) 7881556Srgrimes break; 7891556Srgrimes } 7901556Srgrimes } 7911556Srgrimes } 7921556Srgrimes return p; 7931556Srgrimes} 7941556Srgrimes 7951556Srgrimes 7961556Srgrimes 7971556Srgrimes/* 7981556Srgrimes * Test whether a specialized variable is set. 7991556Srgrimes */ 8001556Srgrimes 8011556SrgrimesSTATIC int 80290111Simpvarisset(char *name, int nulok) 80325233Ssteve{ 8041556Srgrimes 80525233Ssteve if (*name == '!') 80625233Ssteve return backgndpid != -1; 80725233Ssteve else if (*name == '@' || *name == '*') { 8081556Srgrimes if (*shellparam.p == NULL) 8091556Srgrimes return 0; 81025233Ssteve 81125233Ssteve if (nulok) { 81225233Ssteve char **av; 81325233Ssteve 81425233Ssteve for (av = shellparam.p; *av; av++) 81525233Ssteve if (**av != '\0') 81625233Ssteve return 1; 81725233Ssteve return 0; 81825233Ssteve } 81918202Speter } else if (is_digit(*name)) { 82025233Ssteve char *ap; 82120425Ssteve int num = atoi(name); 82225233Ssteve 82325233Ssteve if (num > shellparam.nparam) 82425233Ssteve return 0; 82525233Ssteve 82625233Ssteve if (num == 0) 82725233Ssteve ap = arg0; 82825233Ssteve else 82925233Ssteve ap = shellparam.p[num - 1]; 83025233Ssteve 83125233Ssteve if (nulok && (ap == NULL || *ap == '\0')) 83225233Ssteve return 0; 8331556Srgrimes } 8341556Srgrimes return 1; 8351556Srgrimes} 8361556Srgrimes 8371556Srgrimes 8381556Srgrimes 8391556Srgrimes/* 8401556Srgrimes * Add the value of a specialized variable to the stack string. 8411556Srgrimes */ 8421556Srgrimes 8431556SrgrimesSTATIC void 84490111Simpvarvalue(char *name, int quoted, int allow_split) 84517987Speter{ 8461556Srgrimes int num; 8471556Srgrimes char *p; 8481556Srgrimes int i; 84917987Speter extern int oexitstatus; 8501556Srgrimes char sep; 8511556Srgrimes char **ap; 8521556Srgrimes char const *syntax; 8531556Srgrimes 8541556Srgrimes#define STRTODEST(p) \ 8551556Srgrimes do {\ 8561556Srgrimes if (allow_split) { \ 8571556Srgrimes syntax = quoted? DQSYNTAX : BASESYNTAX; \ 8581556Srgrimes while (*p) { \ 85983675Stegge if (syntax[(int)*p] == CCTL) \ 8601556Srgrimes STPUTC(CTLESC, expdest); \ 8611556Srgrimes STPUTC(*p++, expdest); \ 8621556Srgrimes } \ 8631556Srgrimes } else \ 8641556Srgrimes while (*p) \ 8651556Srgrimes STPUTC(*p++, expdest); \ 8661556Srgrimes } while (0) 8671556Srgrimes 8681556Srgrimes 86918202Speter switch (*name) { 8701556Srgrimes case '$': 8711556Srgrimes num = rootpid; 8721556Srgrimes goto numvar; 8731556Srgrimes case '?': 87417987Speter num = oexitstatus; 8751556Srgrimes goto numvar; 8761556Srgrimes case '#': 8771556Srgrimes num = shellparam.nparam; 8781556Srgrimes goto numvar; 8791556Srgrimes case '!': 8801556Srgrimes num = backgndpid; 8811556Srgrimesnumvar: 88217987Speter expdest = cvtnum(num, expdest); 8831556Srgrimes break; 8841556Srgrimes case '-': 8851556Srgrimes for (i = 0 ; i < NOPTS ; i++) { 8861556Srgrimes if (optlist[i].val) 8871556Srgrimes STPUTC(optlist[i].letter, expdest); 8881556Srgrimes } 8891556Srgrimes break; 8901556Srgrimes case '@': 89138887Stegge if (allow_split && quoted) { 89238887Stegge for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 89338887Stegge STRTODEST(p); 89438887Stegge if (*ap) 89538887Stegge STPUTC('\0', expdest); 89638887Stegge } 89738887Stegge break; 8981556Srgrimes } 899102410Scharnier /* FALLTHROUGH */ 9001556Srgrimes case '*': 901149825Srse if (ifsset()) 90238887Stegge sep = ifsval()[0]; 90338887Stegge else 90438887Stegge sep = ' '; 9051556Srgrimes for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 9061556Srgrimes STRTODEST(p); 90738887Stegge if (*ap && sep) 9081556Srgrimes STPUTC(sep, expdest); 9091556Srgrimes } 9101556Srgrimes break; 9111556Srgrimes case '0': 9121556Srgrimes p = arg0; 9131556Srgrimes STRTODEST(p); 9141556Srgrimes break; 9151556Srgrimes default: 91618202Speter if (is_digit(*name)) { 91718202Speter num = atoi(name); 91818202Speter if (num > 0 && num <= shellparam.nparam) { 91918202Speter p = shellparam.p[num - 1]; 92018202Speter STRTODEST(p); 92118202Speter } 9221556Srgrimes } 9231556Srgrimes break; 9241556Srgrimes } 9251556Srgrimes} 9261556Srgrimes 9271556Srgrimes 9281556Srgrimes 9291556Srgrimes/* 9301556Srgrimes * Record the the fact that we have to scan this region of the 9311556Srgrimes * string for IFS characters. 9321556Srgrimes */ 9331556Srgrimes 9341556SrgrimesSTATIC void 93590111Simprecordregion(int start, int end, int nulonly) 93617987Speter{ 93725233Ssteve struct ifsregion *ifsp; 9381556Srgrimes 9391556Srgrimes if (ifslastp == NULL) { 9401556Srgrimes ifsp = &ifsfirst; 9411556Srgrimes } else { 9421556Srgrimes ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 9431556Srgrimes ifslastp->next = ifsp; 9441556Srgrimes } 9451556Srgrimes ifslastp = ifsp; 9461556Srgrimes ifslastp->next = NULL; 9471556Srgrimes ifslastp->begoff = start; 9481556Srgrimes ifslastp->endoff = end; 9491556Srgrimes ifslastp->nulonly = nulonly; 9501556Srgrimes} 9511556Srgrimes 9521556Srgrimes 9531556Srgrimes 9541556Srgrimes/* 9551556Srgrimes * Break the argument string into pieces based upon IFS and add the 9561556Srgrimes * strings to the argument list. The regions of the string to be 9571556Srgrimes * searched for IFS characters have been stored by recordregion. 9581556Srgrimes */ 9591556SrgrimesSTATIC void 96090111Simpifsbreakup(char *string, struct arglist *arglist) 96190111Simp{ 9621556Srgrimes struct ifsregion *ifsp; 9631556Srgrimes struct strlist *sp; 9641556Srgrimes char *start; 96525233Ssteve char *p; 9661556Srgrimes char *q; 9671556Srgrimes char *ifs; 96817987Speter int ifsspc; 96938887Stegge int nulonly; 9701556Srgrimes 97117987Speter 9721556Srgrimes start = string; 97338887Stegge ifsspc = 0; 97438887Stegge nulonly = 0; 9751556Srgrimes if (ifslastp != NULL) { 9761556Srgrimes ifsp = &ifsfirst; 9771556Srgrimes do { 9781556Srgrimes p = string + ifsp->begoff; 97938887Stegge nulonly = ifsp->nulonly; 980155301Sschweikh ifs = nulonly ? nullstr : 98138887Stegge ( ifsset() ? ifsval() : " \t\n" ); 98238887Stegge ifsspc = 0; 9831556Srgrimes while (p < string + ifsp->endoff) { 9841556Srgrimes q = p; 9851556Srgrimes if (*p == CTLESC) 9861556Srgrimes p++; 98738887Stegge if (strchr(ifs, *p)) { 98838887Stegge if (!nulonly) 98938887Stegge ifsspc = (strchr(" \t\n", *p) != NULL); 99038887Stegge /* Ignore IFS whitespace at start */ 99138887Stegge if (q == start && ifsspc) { 99238887Stegge p++; 99338887Stegge start = p; 99438887Stegge continue; 9951556Srgrimes } 99638887Stegge *q = '\0'; 99738887Stegge sp = (struct strlist *)stalloc(sizeof *sp); 99838887Stegge sp->text = start; 99938887Stegge *arglist->lastp = sp; 100038887Stegge arglist->lastp = &sp->next; 100138887Stegge p++; 100238887Stegge if (!nulonly) { 10031556Srgrimes for (;;) { 100438887Stegge if (p >= string + ifsp->endoff) { 10051556Srgrimes break; 100638887Stegge } 10071556Srgrimes q = p; 10081556Srgrimes if (*p == CTLESC) 10091556Srgrimes p++; 101038887Stegge if (strchr(ifs, *p) == NULL ) { 10111556Srgrimes p = q; 10121556Srgrimes break; 101338887Stegge } else if (strchr(" \t\n",*p) == NULL) { 101438887Stegge if (ifsspc) { 101538887Stegge p++; 101638887Stegge ifsspc = 0; 101738887Stegge } else { 101838887Stegge p = q; 101938887Stegge break; 102038887Stegge } 102138887Stegge } else 102238887Stegge p++; 10231556Srgrimes } 10241556Srgrimes } 10251556Srgrimes start = p; 102638887Stegge } else 102738887Stegge p++; 10281556Srgrimes } 10291556Srgrimes } while ((ifsp = ifsp->next) != NULL); 1030149825Srse if (*start || (!ifsspc && start > string)) { 10311556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10321556Srgrimes sp->text = start; 10331556Srgrimes *arglist->lastp = sp; 10341556Srgrimes arglist->lastp = &sp->next; 10351556Srgrimes } 10361556Srgrimes } else { 10371556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10381556Srgrimes sp->text = start; 10391556Srgrimes *arglist->lastp = sp; 10401556Srgrimes arglist->lastp = &sp->next; 10411556Srgrimes } 10421556Srgrimes} 10431556Srgrimes 10441556Srgrimes 10451556Srgrimes 10461556Srgrimes/* 10471556Srgrimes * Expand shell metacharacters. At this point, the only control characters 10481556Srgrimes * should be escapes. The results are stored in the list exparg. 10491556Srgrimes */ 10501556Srgrimes 1051117261SddsSTATIC char *expdir; 10521556Srgrimes 10531556Srgrimes 10541556SrgrimesSTATIC void 105590111Simpexpandmeta(struct strlist *str, int flag __unused) 105617987Speter{ 10571556Srgrimes char *p; 10581556Srgrimes struct strlist **savelastp; 10591556Srgrimes struct strlist *sp; 10601556Srgrimes char c; 10611556Srgrimes /* TODO - EXP_REDIR */ 10621556Srgrimes 10631556Srgrimes while (str) { 10641556Srgrimes if (fflag) 10651556Srgrimes goto nometa; 10661556Srgrimes p = str->text; 10671556Srgrimes for (;;) { /* fast check for meta chars */ 10681556Srgrimes if ((c = *p++) == '\0') 10691556Srgrimes goto nometa; 10701556Srgrimes if (c == '*' || c == '?' || c == '[' || c == '!') 10711556Srgrimes break; 10721556Srgrimes } 10731556Srgrimes savelastp = exparg.lastp; 10741556Srgrimes INTOFF; 10751556Srgrimes if (expdir == NULL) { 10761556Srgrimes int i = strlen(str->text); 10771556Srgrimes expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 10781556Srgrimes } 10791556Srgrimes 10801556Srgrimes expmeta(expdir, str->text); 10811556Srgrimes ckfree(expdir); 10821556Srgrimes expdir = NULL; 10831556Srgrimes INTON; 10841556Srgrimes if (exparg.lastp == savelastp) { 10858855Srgrimes /* 10868855Srgrimes * no matches 10871556Srgrimes */ 10881556Srgrimesnometa: 10891556Srgrimes *exparg.lastp = str; 10901556Srgrimes rmescapes(str->text); 10911556Srgrimes exparg.lastp = &str->next; 10921556Srgrimes } else { 10931556Srgrimes *exparg.lastp = NULL; 10941556Srgrimes *savelastp = sp = expsort(*savelastp); 10951556Srgrimes while (sp->next != NULL) 10961556Srgrimes sp = sp->next; 10971556Srgrimes exparg.lastp = &sp->next; 10981556Srgrimes } 10991556Srgrimes str = str->next; 11001556Srgrimes } 11011556Srgrimes} 11021556Srgrimes 11031556Srgrimes 11041556Srgrimes/* 11051556Srgrimes * Do metacharacter (i.e. *, ?, [...]) expansion. 11061556Srgrimes */ 11071556Srgrimes 11081556SrgrimesSTATIC void 110990111Simpexpmeta(char *enddir, char *name) 111090111Simp{ 111125233Ssteve char *p; 11121556Srgrimes char *q; 11131556Srgrimes char *start; 11141556Srgrimes char *endname; 11151556Srgrimes int metaflag; 11161556Srgrimes struct stat statb; 11171556Srgrimes DIR *dirp; 11181556Srgrimes struct dirent *dp; 11191556Srgrimes int atend; 11201556Srgrimes int matchdot; 11211556Srgrimes 11221556Srgrimes metaflag = 0; 11231556Srgrimes start = name; 11241556Srgrimes for (p = name ; ; p++) { 11251556Srgrimes if (*p == '*' || *p == '?') 11261556Srgrimes metaflag = 1; 11271556Srgrimes else if (*p == '[') { 11281556Srgrimes q = p + 1; 112926488Sache if (*q == '!' || *q == '^') 11301556Srgrimes q++; 11311556Srgrimes for (;;) { 113238887Stegge while (*q == CTLQUOTEMARK) 113338887Stegge q++; 11341556Srgrimes if (*q == CTLESC) 11351556Srgrimes q++; 11361556Srgrimes if (*q == '/' || *q == '\0') 11371556Srgrimes break; 11381556Srgrimes if (*++q == ']') { 11391556Srgrimes metaflag = 1; 11401556Srgrimes break; 11411556Srgrimes } 11421556Srgrimes } 11431556Srgrimes } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 11441556Srgrimes metaflag = 1; 11451556Srgrimes } else if (*p == '\0') 11461556Srgrimes break; 114738887Stegge else if (*p == CTLQUOTEMARK) 114838887Stegge continue; 11491556Srgrimes else if (*p == CTLESC) 11501556Srgrimes p++; 11511556Srgrimes if (*p == '/') { 11521556Srgrimes if (metaflag) 11531556Srgrimes break; 11541556Srgrimes start = p + 1; 11551556Srgrimes } 11561556Srgrimes } 11571556Srgrimes if (metaflag == 0) { /* we've reached the end of the file name */ 11581556Srgrimes if (enddir != expdir) 11591556Srgrimes metaflag++; 11601556Srgrimes for (p = name ; ; p++) { 116138887Stegge if (*p == CTLQUOTEMARK) 116238887Stegge continue; 11631556Srgrimes if (*p == CTLESC) 11641556Srgrimes p++; 11651556Srgrimes *enddir++ = *p; 11661556Srgrimes if (*p == '\0') 11671556Srgrimes break; 11681556Srgrimes } 1169147812Sdelphij if (metaflag == 0 || lstat(expdir, &statb) >= 0) 11701556Srgrimes addfname(expdir); 11711556Srgrimes return; 11721556Srgrimes } 11731556Srgrimes endname = p; 11741556Srgrimes if (start != name) { 11751556Srgrimes p = name; 11761556Srgrimes while (p < start) { 117738887Stegge while (*p == CTLQUOTEMARK) 117838887Stegge p++; 11791556Srgrimes if (*p == CTLESC) 11801556Srgrimes p++; 11811556Srgrimes *enddir++ = *p++; 11821556Srgrimes } 11831556Srgrimes } 11841556Srgrimes if (enddir == expdir) { 11851556Srgrimes p = "."; 11861556Srgrimes } else if (enddir == expdir + 1 && *expdir == '/') { 11871556Srgrimes p = "/"; 11881556Srgrimes } else { 11891556Srgrimes p = expdir; 11901556Srgrimes enddir[-1] = '\0'; 11911556Srgrimes } 11921556Srgrimes if ((dirp = opendir(p)) == NULL) 11931556Srgrimes return; 11941556Srgrimes if (enddir != expdir) 11951556Srgrimes enddir[-1] = '/'; 11961556Srgrimes if (*endname == 0) { 11971556Srgrimes atend = 1; 11981556Srgrimes } else { 11991556Srgrimes atend = 0; 12001556Srgrimes *endname++ = '\0'; 12011556Srgrimes } 12021556Srgrimes matchdot = 0; 120338887Stegge p = start; 120438887Stegge while (*p == CTLQUOTEMARK) 120538887Stegge p++; 120638887Stegge if (*p == CTLESC) 120738887Stegge p++; 120838887Stegge if (*p == '.') 12091556Srgrimes matchdot++; 12101556Srgrimes while (! int_pending() && (dp = readdir(dirp)) != NULL) { 12111556Srgrimes if (dp->d_name[0] == '.' && ! matchdot) 12121556Srgrimes continue; 121345514Stegge if (patmatch(start, dp->d_name, 0)) { 12141556Srgrimes if (atend) { 12151556Srgrimes scopy(dp->d_name, enddir); 12161556Srgrimes addfname(expdir); 12171556Srgrimes } else { 121817987Speter for (p = enddir, q = dp->d_name; 121917987Speter (*p++ = *q++) != '\0';) 122017987Speter continue; 12211556Srgrimes p[-1] = '/'; 12221556Srgrimes expmeta(p, endname); 12231556Srgrimes } 12241556Srgrimes } 12251556Srgrimes } 12261556Srgrimes closedir(dirp); 12271556Srgrimes if (! atend) 12281556Srgrimes endname[-1] = '/'; 12291556Srgrimes} 12301556Srgrimes 12311556Srgrimes 12321556Srgrimes/* 12331556Srgrimes * Add a file name to the list. 12341556Srgrimes */ 12351556Srgrimes 12361556SrgrimesSTATIC void 123790111Simpaddfname(char *name) 123890111Simp{ 12391556Srgrimes char *p; 12401556Srgrimes struct strlist *sp; 12411556Srgrimes 12421556Srgrimes p = stalloc(strlen(name) + 1); 12431556Srgrimes scopy(name, p); 12441556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 12451556Srgrimes sp->text = p; 12461556Srgrimes *exparg.lastp = sp; 12471556Srgrimes exparg.lastp = &sp->next; 12481556Srgrimes} 12491556Srgrimes 12501556Srgrimes 12511556Srgrimes/* 12521556Srgrimes * Sort the results of file name expansion. It calculates the number of 12531556Srgrimes * strings to sort and then calls msort (short for merge sort) to do the 12541556Srgrimes * work. 12551556Srgrimes */ 12561556Srgrimes 12571556SrgrimesSTATIC struct strlist * 125890111Simpexpsort(struct strlist *str) 125990111Simp{ 12601556Srgrimes int len; 12611556Srgrimes struct strlist *sp; 12621556Srgrimes 12631556Srgrimes len = 0; 12641556Srgrimes for (sp = str ; sp ; sp = sp->next) 12651556Srgrimes len++; 12661556Srgrimes return msort(str, len); 12671556Srgrimes} 12681556Srgrimes 12691556Srgrimes 12701556SrgrimesSTATIC struct strlist * 127190111Simpmsort(struct strlist *list, int len) 127217987Speter{ 127317987Speter struct strlist *p, *q = NULL; 12741556Srgrimes struct strlist **lpp; 12751556Srgrimes int half; 12761556Srgrimes int n; 12771556Srgrimes 12781556Srgrimes if (len <= 1) 12791556Srgrimes return list; 12808855Srgrimes half = len >> 1; 12811556Srgrimes p = list; 12821556Srgrimes for (n = half ; --n >= 0 ; ) { 12831556Srgrimes q = p; 12841556Srgrimes p = p->next; 12851556Srgrimes } 12861556Srgrimes q->next = NULL; /* terminate first half of list */ 12871556Srgrimes q = msort(list, half); /* sort first half of list */ 12881556Srgrimes p = msort(p, len - half); /* sort second half */ 12891556Srgrimes lpp = &list; 12901556Srgrimes for (;;) { 12911556Srgrimes if (strcmp(p->text, q->text) < 0) { 12921556Srgrimes *lpp = p; 12931556Srgrimes lpp = &p->next; 12941556Srgrimes if ((p = *lpp) == NULL) { 12951556Srgrimes *lpp = q; 12961556Srgrimes break; 12971556Srgrimes } 12981556Srgrimes } else { 12991556Srgrimes *lpp = q; 13001556Srgrimes lpp = &q->next; 13011556Srgrimes if ((q = *lpp) == NULL) { 13021556Srgrimes *lpp = p; 13031556Srgrimes break; 13041556Srgrimes } 13051556Srgrimes } 13061556Srgrimes } 13071556Srgrimes return list; 13081556Srgrimes} 13091556Srgrimes 13101556Srgrimes 13111556Srgrimes 13121556Srgrimes/* 13131556Srgrimes * Returns true if the pattern matches the string. 13141556Srgrimes */ 13151556Srgrimes 13161556Srgrimesint 131790111Simppatmatch(char *pattern, char *string, int squoted) 131890111Simp{ 13191556Srgrimes#ifdef notdef 13201556Srgrimes if (pattern[0] == '!' && pattern[1] == '!') 13211556Srgrimes return 1 - pmatch(pattern + 2, string); 13221556Srgrimes else 13231556Srgrimes#endif 132445514Stegge return pmatch(pattern, string, squoted); 13251556Srgrimes} 13261556Srgrimes 132717987Speter 132817525SacheSTATIC int 132990111Simppmatch(char *pattern, char *string, int squoted) 133090111Simp{ 133125233Ssteve char *p, *q; 133225233Ssteve char c; 13331556Srgrimes 13341556Srgrimes p = pattern; 13351556Srgrimes q = string; 13361556Srgrimes for (;;) { 13371556Srgrimes switch (c = *p++) { 13381556Srgrimes case '\0': 13391556Srgrimes goto breakloop; 13401556Srgrimes case CTLESC: 134145514Stegge if (squoted && *q == CTLESC) 134245514Stegge q++; 13431556Srgrimes if (*q++ != *p++) 13441556Srgrimes return 0; 13451556Srgrimes break; 134638887Stegge case CTLQUOTEMARK: 134738887Stegge continue; 13481556Srgrimes case '?': 134945514Stegge if (squoted && *q == CTLESC) 135045514Stegge q++; 13511556Srgrimes if (*q++ == '\0') 13521556Srgrimes return 0; 13531556Srgrimes break; 13541556Srgrimes case '*': 13551556Srgrimes c = *p; 135638887Stegge while (c == CTLQUOTEMARK || c == '*') 135738887Stegge c = *++p; 135838887Stegge if (c != CTLESC && c != CTLQUOTEMARK && 135938887Stegge c != '?' && c != '*' && c != '[') { 13601556Srgrimes while (*q != c) { 136145514Stegge if (squoted && *q == CTLESC && 136245514Stegge q[1] == c) 136345514Stegge break; 13641556Srgrimes if (*q == '\0') 13651556Srgrimes return 0; 136645514Stegge if (squoted && *q == CTLESC) 136745514Stegge q++; 13681556Srgrimes q++; 13691556Srgrimes } 13701556Srgrimes } 13711556Srgrimes do { 137245514Stegge if (pmatch(p, q, squoted)) 13731556Srgrimes return 1; 137445514Stegge if (squoted && *q == CTLESC) 137545514Stegge q++; 13761556Srgrimes } while (*q++ != '\0'); 13771556Srgrimes return 0; 13781556Srgrimes case '[': { 13791556Srgrimes char *endp; 13801556Srgrimes int invert, found; 13811556Srgrimes char chr; 13821556Srgrimes 13831556Srgrimes endp = p; 138426488Sache if (*endp == '!' || *endp == '^') 13851556Srgrimes endp++; 13861556Srgrimes for (;;) { 138738887Stegge while (*endp == CTLQUOTEMARK) 138838887Stegge endp++; 13891556Srgrimes if (*endp == '\0') 13901556Srgrimes goto dft; /* no matching ] */ 13911556Srgrimes if (*endp == CTLESC) 13921556Srgrimes endp++; 13931556Srgrimes if (*++endp == ']') 13941556Srgrimes break; 13951556Srgrimes } 13961556Srgrimes invert = 0; 139726488Sache if (*p == '!' || *p == '^') { 13981556Srgrimes invert++; 13991556Srgrimes p++; 14001556Srgrimes } 14011556Srgrimes found = 0; 14021556Srgrimes chr = *q++; 140345514Stegge if (squoted && chr == CTLESC) 140445514Stegge chr = *q++; 140517987Speter if (chr == '\0') 140617987Speter return 0; 14071556Srgrimes c = *p++; 14081556Srgrimes do { 140938887Stegge if (c == CTLQUOTEMARK) 141038887Stegge continue; 14111556Srgrimes if (c == CTLESC) 14121556Srgrimes c = *p++; 14131556Srgrimes if (*p == '-' && p[1] != ']') { 14141556Srgrimes p++; 141538887Stegge while (*p == CTLQUOTEMARK) 141638887Stegge p++; 14171556Srgrimes if (*p == CTLESC) 14181556Srgrimes p++; 141917557Sache if ( collate_range_cmp(chr, c) >= 0 142017557Sache && collate_range_cmp(chr, *p) <= 0 142117525Sache ) 14221556Srgrimes found = 1; 14231556Srgrimes p++; 14241556Srgrimes } else { 14251556Srgrimes if (chr == c) 14261556Srgrimes found = 1; 14271556Srgrimes } 14281556Srgrimes } while ((c = *p++) != ']'); 14291556Srgrimes if (found == invert) 14301556Srgrimes return 0; 14311556Srgrimes break; 14321556Srgrimes } 14331556Srgrimesdft: default: 143445514Stegge if (squoted && *q == CTLESC) 143545514Stegge q++; 14361556Srgrimes if (*q++ != c) 14371556Srgrimes return 0; 14381556Srgrimes break; 14391556Srgrimes } 14401556Srgrimes } 14411556Srgrimesbreakloop: 14421556Srgrimes if (*q != '\0') 14431556Srgrimes return 0; 14441556Srgrimes return 1; 14451556Srgrimes} 14461556Srgrimes 14471556Srgrimes 14481556Srgrimes 14491556Srgrimes/* 14501556Srgrimes * Remove any CTLESC characters from a string. 14511556Srgrimes */ 14521556Srgrimes 14531556Srgrimesvoid 145490111Simprmescapes(char *str) 145538887Stegge{ 145625233Ssteve char *p, *q; 14571556Srgrimes 14581556Srgrimes p = str; 145938887Stegge while (*p != CTLESC && *p != CTLQUOTEMARK) { 14601556Srgrimes if (*p++ == '\0') 14611556Srgrimes return; 14621556Srgrimes } 14631556Srgrimes q = p; 14641556Srgrimes while (*p) { 146538887Stegge if (*p == CTLQUOTEMARK) { 146638887Stegge p++; 146738887Stegge continue; 146838887Stegge } 14691556Srgrimes if (*p == CTLESC) 14701556Srgrimes p++; 14711556Srgrimes *q++ = *p++; 14721556Srgrimes } 14731556Srgrimes *q = '\0'; 14741556Srgrimes} 14751556Srgrimes 14761556Srgrimes 14771556Srgrimes 14781556Srgrimes/* 14791556Srgrimes * See if a pattern matches in a case statement. 14801556Srgrimes */ 14811556Srgrimes 14821556Srgrimesint 148390111Simpcasematch(union node *pattern, char *val) 148490111Simp{ 14851556Srgrimes struct stackmark smark; 14861556Srgrimes int result; 14871556Srgrimes char *p; 14881556Srgrimes 14891556Srgrimes setstackmark(&smark); 14901556Srgrimes argbackq = pattern->narg.backquote; 14911556Srgrimes STARTSTACKSTR(expdest); 14921556Srgrimes ifslastp = NULL; 14931556Srgrimes argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 14941556Srgrimes STPUTC('\0', expdest); 14951556Srgrimes p = grabstackstr(expdest); 149645514Stegge result = patmatch(p, val, 0); 14971556Srgrimes popstackmark(&smark); 14981556Srgrimes return result; 14991556Srgrimes} 150017987Speter 150117987Speter/* 150217987Speter * Our own itoa(). 150317987Speter */ 150417987Speter 150517987SpeterSTATIC char * 150690111Simpcvtnum(int num, char *buf) 150790111Simp{ 150817987Speter char temp[32]; 150917987Speter int neg = num < 0; 151017987Speter char *p = temp + 31; 151117987Speter 151217987Speter temp[31] = '\0'; 151317987Speter 151417987Speter do { 151517987Speter *--p = num % 10 + '0'; 151617987Speter } while ((num /= 10) != 0); 151717987Speter 151817987Speter if (neg) 151917987Speter *--p = '-'; 152017987Speter 152117987Speter while (*p) 152217987Speter STPUTC(*p++, buf); 152317987Speter return buf; 152417987Speter} 1525108286Stjr 1526108286Stjr/* 1527108286Stjr * Do most of the work for wordexp(3). 1528108286Stjr */ 1529108286Stjr 1530108286Stjrint 1531108286Stjrwordexpcmd(int argc, char **argv) 1532108286Stjr{ 1533108286Stjr size_t len; 1534108286Stjr int i; 1535108286Stjr 1536108286Stjr out1fmt("%08x", argc - 1); 1537108286Stjr for (i = 1, len = 0; i < argc; i++) 1538108286Stjr len += strlen(argv[i]); 1539108286Stjr out1fmt("%08x", (int)len); 1540108286Stjr for (i = 1; i < argc; i++) { 1541108286Stjr out1str(argv[i]); 1542108286Stjr out1c('\0'); 1543108286Stjr } 1544108286Stjr return (0); 1545108286Stjr} 1546