expand.c revision 45514
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 * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 351556Srgrimes */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836150Scharnier#if 0 3936150Scharnierstatic char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 4036150Scharnier#endif 4136150Scharnierstatic const char rcsid[] = 4245514Stegge "$Id: expand.c,v 1.24 1998/09/13 19:24:57 tegge Exp $"; 431556Srgrimes#endif /* not lint */ 441556Srgrimes 4517987Speter#include <sys/types.h> 4617987Speter#include <sys/time.h> 4717987Speter#include <sys/stat.h> 4817987Speter#include <errno.h> 4917987Speter#include <dirent.h> 5017987Speter#include <unistd.h> 5117987Speter#include <pwd.h> 5217987Speter#include <stdlib.h> 5319281Sache#include <limits.h> 5438887Stegge#include <stdio.h> 5517987Speter 561556Srgrimes/* 571556Srgrimes * Routines to expand arguments to commands. We have to deal with 581556Srgrimes * backquotes, shell variables, and file metacharacters. 591556Srgrimes */ 601556Srgrimes 611556Srgrimes#include "shell.h" 621556Srgrimes#include "main.h" 631556Srgrimes#include "nodes.h" 641556Srgrimes#include "eval.h" 651556Srgrimes#include "expand.h" 661556Srgrimes#include "syntax.h" 671556Srgrimes#include "parser.h" 681556Srgrimes#include "jobs.h" 691556Srgrimes#include "options.h" 701556Srgrimes#include "var.h" 711556Srgrimes#include "input.h" 721556Srgrimes#include "output.h" 731556Srgrimes#include "memalloc.h" 741556Srgrimes#include "error.h" 751556Srgrimes#include "mystring.h" 7617987Speter#include "arith.h" 7717987Speter#include "show.h" 781556Srgrimes 791556Srgrimes/* 801556Srgrimes * Structure specifying which parts of the string should be searched 811556Srgrimes * for IFS characters. 821556Srgrimes */ 831556Srgrimes 841556Srgrimesstruct ifsregion { 851556Srgrimes struct ifsregion *next; /* next region in list */ 861556Srgrimes int begoff; /* offset of start of region */ 871556Srgrimes int endoff; /* offset of end of region */ 881556Srgrimes int nulonly; /* search for nul bytes only */ 891556Srgrimes}; 901556Srgrimes 911556Srgrimes 921556Srgrimeschar *expdest; /* output of current string */ 931556Srgrimesstruct nodelist *argbackq; /* list of back quote expressions */ 941556Srgrimesstruct ifsregion ifsfirst; /* first struct in list of ifs regions */ 951556Srgrimesstruct ifsregion *ifslastp; /* last struct in list */ 961556Srgrimesstruct arglist exparg; /* holds expanded arg list */ 971556Srgrimes 9817987SpeterSTATIC void argstr __P((char *, int)); 9917987SpeterSTATIC char *exptilde __P((char *, int)); 10017987SpeterSTATIC void expbackq __P((union node *, int, int)); 10120425SsteveSTATIC int subevalvar __P((char *, char *, int, int, int, int)); 10217987SpeterSTATIC char *evalvar __P((char *, int)); 10325233SsteveSTATIC int varisset __P((char *, int)); 10418202SpeterSTATIC void varvalue __P((char *, int, int)); 10517987SpeterSTATIC void recordregion __P((int, int, int)); 10638887SteggeSTATIC void removerecordregions __P((int)); 10717987SpeterSTATIC void ifsbreakup __P((char *, struct arglist *)); 10817987SpeterSTATIC void expandmeta __P((struct strlist *, int)); 10917987SpeterSTATIC void expmeta __P((char *, char *)); 11017987SpeterSTATIC void addfname __P((char *)); 11117987SpeterSTATIC struct strlist *expsort __P((struct strlist *)); 11217987SpeterSTATIC struct strlist *msort __P((struct strlist *, int)); 11345514SteggeSTATIC int pmatch __P((char *, char *, int)); 11417987SpeterSTATIC char *cvtnum __P((int, char *)); 11519281SacheSTATIC int collate_range_cmp __P((int, int)); 1161556Srgrimes 11719281SacheSTATIC int collate_range_cmp (c1, c2) 11819281Sache int c1, c2; 11919281Sache{ 12019281Sache static char s1[2], s2[2]; 12119281Sache int ret; 12219281Sache 12319281Sache c1 &= UCHAR_MAX; 12419281Sache c2 &= UCHAR_MAX; 12519281Sache if (c1 == c2) 12619281Sache return (0); 12719281Sache s1[0] = c1; 12819281Sache s2[0] = c2; 12919281Sache if ((ret = strcoll(s1, s2)) != 0) 13019281Sache return (ret); 13119281Sache return (c1 - c2); 13219281Sache} 13319281Sache 1341556Srgrimes/* 1351556Srgrimes * Expand shell variables and backquotes inside a here document. 1361556Srgrimes */ 1371556Srgrimes 1381556Srgrimesvoid 1391556Srgrimesexpandhere(arg, fd) 1401556Srgrimes union node *arg; /* the document */ 1411556Srgrimes int fd; /* where to write the expanded version */ 1421556Srgrimes { 1431556Srgrimes herefd = fd; 1441556Srgrimes expandarg(arg, (struct arglist *)NULL, 0); 14539137Stegge xwrite(fd, stackblock(), expdest - stackblock()); 1461556Srgrimes} 1471556Srgrimes 1481556Srgrimes 1491556Srgrimes/* 1501556Srgrimes * Perform variable substitution and command substitution on an argument, 1511556Srgrimes * placing the resulting list of arguments in arglist. If EXP_FULL is true, 1521556Srgrimes * perform splitting and file name expansion. When arglist is NULL, perform 1531556Srgrimes * here document expansion. 1541556Srgrimes */ 1551556Srgrimes 1561556Srgrimesvoid 1571556Srgrimesexpandarg(arg, arglist, flag) 1581556Srgrimes union node *arg; 1591556Srgrimes struct arglist *arglist; 16017987Speter int flag; 16117987Speter{ 1621556Srgrimes struct strlist *sp; 1631556Srgrimes char *p; 1641556Srgrimes 1651556Srgrimes argbackq = arg->narg.backquote; 1661556Srgrimes STARTSTACKSTR(expdest); 1671556Srgrimes ifsfirst.next = NULL; 1681556Srgrimes ifslastp = NULL; 1691556Srgrimes argstr(arg->narg.text, flag); 1701556Srgrimes if (arglist == NULL) { 1711556Srgrimes return; /* here document expanded */ 1721556Srgrimes } 1731556Srgrimes STPUTC('\0', expdest); 1741556Srgrimes p = grabstackstr(expdest); 1751556Srgrimes exparg.lastp = &exparg.list; 1761556Srgrimes /* 1771556Srgrimes * TODO - EXP_REDIR 1781556Srgrimes */ 1791556Srgrimes if (flag & EXP_FULL) { 1801556Srgrimes ifsbreakup(p, &exparg); 1811556Srgrimes *exparg.lastp = NULL; 1821556Srgrimes exparg.lastp = &exparg.list; 1831556Srgrimes expandmeta(exparg.list, flag); 1841556Srgrimes } else { 1851556Srgrimes if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 1861556Srgrimes rmescapes(p); 1871556Srgrimes sp = (struct strlist *)stalloc(sizeof (struct strlist)); 1881556Srgrimes sp->text = p; 1891556Srgrimes *exparg.lastp = sp; 1901556Srgrimes exparg.lastp = &sp->next; 1911556Srgrimes } 1921556Srgrimes while (ifsfirst.next != NULL) { 1931556Srgrimes struct ifsregion *ifsp; 1941556Srgrimes INTOFF; 1951556Srgrimes ifsp = ifsfirst.next->next; 1961556Srgrimes ckfree(ifsfirst.next); 1971556Srgrimes ifsfirst.next = ifsp; 1981556Srgrimes INTON; 1991556Srgrimes } 2001556Srgrimes *exparg.lastp = NULL; 2011556Srgrimes if (exparg.list) { 2021556Srgrimes *arglist->lastp = exparg.list; 2031556Srgrimes arglist->lastp = exparg.lastp; 2041556Srgrimes } 2051556Srgrimes} 2061556Srgrimes 2071556Srgrimes 2081556Srgrimes 2091556Srgrimes/* 2101556Srgrimes * Perform variable and command substitution. If EXP_FULL is set, output CTLESC 2111556Srgrimes * characters to allow for further processing. Otherwise treat 2121556Srgrimes * $@ like $* since no splitting will be performed. 2131556Srgrimes */ 2141556Srgrimes 2151556SrgrimesSTATIC void 2161556Srgrimesargstr(p, flag) 21725233Ssteve char *p; 21817987Speter int flag; 21917987Speter{ 22025233Ssteve char c; 2211556Srgrimes int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */ 2221556Srgrimes int firsteq = 1; 2231556Srgrimes 2241556Srgrimes if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 2251556Srgrimes p = exptilde(p, flag); 2261556Srgrimes for (;;) { 2271556Srgrimes switch (c = *p++) { 2281556Srgrimes case '\0': 2291556Srgrimes case CTLENDVAR: /* ??? */ 2301556Srgrimes goto breakloop; 23138887Stegge case CTLQUOTEMARK: 23238887Stegge /* "$@" syntax adherence hack */ 23338887Stegge if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 23438887Stegge break; 23539137Stegge if ((flag & EXP_FULL) != 0) 23639137Stegge STPUTC(c, expdest); 23738887Stegge break; 2381556Srgrimes case CTLESC: 2391556Srgrimes if (quotes) 2401556Srgrimes STPUTC(c, expdest); 2411556Srgrimes c = *p++; 2421556Srgrimes STPUTC(c, expdest); 2431556Srgrimes break; 2441556Srgrimes case CTLVAR: 2451556Srgrimes p = evalvar(p, flag); 2461556Srgrimes break; 2471556Srgrimes case CTLBACKQ: 2481556Srgrimes case CTLBACKQ|CTLQUOTE: 2491556Srgrimes expbackq(argbackq->n, c & CTLQUOTE, flag); 2501556Srgrimes argbackq = argbackq->next; 2511556Srgrimes break; 2521556Srgrimes case CTLENDARI: 2531556Srgrimes expari(flag); 2541556Srgrimes break; 2551556Srgrimes case ':': 2561556Srgrimes case '=': 2571556Srgrimes /* 2581556Srgrimes * sort of a hack - expand tildes in variable 2591556Srgrimes * assignments (after the first '=' and after ':'s). 2601556Srgrimes */ 2611556Srgrimes STPUTC(c, expdest); 2621556Srgrimes if (flag & EXP_VARTILDE && *p == '~') { 2631556Srgrimes if (c == '=') { 2641556Srgrimes if (firsteq) 2651556Srgrimes firsteq = 0; 2661556Srgrimes else 2671556Srgrimes break; 2681556Srgrimes } 2691556Srgrimes p = exptilde(p, flag); 2701556Srgrimes } 2711556Srgrimes break; 2721556Srgrimes default: 2731556Srgrimes STPUTC(c, expdest); 2741556Srgrimes } 2751556Srgrimes } 2761556Srgrimesbreakloop:; 2771556Srgrimes} 2781556Srgrimes 2791556SrgrimesSTATIC char * 2801556Srgrimesexptilde(p, flag) 2811556Srgrimes char *p; 28217987Speter int flag; 28317987Speter{ 2841556Srgrimes char c, *startp = p; 2851556Srgrimes struct passwd *pw; 2861556Srgrimes char *home; 2871556Srgrimes int quotes = flag & (EXP_FULL | EXP_CASE); 2881556Srgrimes 28917987Speter while ((c = *p) != '\0') { 2901556Srgrimes switch(c) { 2911556Srgrimes case CTLESC: 2921556Srgrimes return (startp); 29339137Stegge case CTLQUOTEMARK: 29439137Stegge return (startp); 2951556Srgrimes case ':': 2961556Srgrimes if (flag & EXP_VARTILDE) 2971556Srgrimes goto done; 2981556Srgrimes break; 2991556Srgrimes case '/': 3001556Srgrimes goto done; 3011556Srgrimes } 3021556Srgrimes p++; 3031556Srgrimes } 3041556Srgrimesdone: 3051556Srgrimes *p = '\0'; 3061556Srgrimes if (*(startp+1) == '\0') { 3071556Srgrimes if ((home = lookupvar("HOME")) == NULL) 3081556Srgrimes goto lose; 3091556Srgrimes } else { 3101556Srgrimes if ((pw = getpwnam(startp+1)) == NULL) 3111556Srgrimes goto lose; 3121556Srgrimes home = pw->pw_dir; 3131556Srgrimes } 3141556Srgrimes if (*home == '\0') 3151556Srgrimes goto lose; 3161556Srgrimes *p = c; 31717987Speter while ((c = *home++) != '\0') { 3181556Srgrimes if (quotes && SQSYNTAX[c] == CCTL) 3191556Srgrimes STPUTC(CTLESC, expdest); 3201556Srgrimes STPUTC(c, expdest); 3211556Srgrimes } 3221556Srgrimes return (p); 3231556Srgrimeslose: 3241556Srgrimes *p = c; 3251556Srgrimes return (startp); 3261556Srgrimes} 3271556Srgrimes 3281556Srgrimes 32938887SteggeSTATIC void 33038887Steggeremoverecordregions(endoff) 33138887Stegge int endoff; 33238887Stegge{ 33338887Stegge if (ifslastp == NULL) 33438887Stegge return; 33538887Stegge 33638887Stegge if (ifsfirst.endoff > endoff) { 33738887Stegge while (ifsfirst.next != NULL) { 33838887Stegge struct ifsregion *ifsp; 33938887Stegge INTOFF; 34038887Stegge ifsp = ifsfirst.next->next; 34138887Stegge ckfree(ifsfirst.next); 34238887Stegge ifsfirst.next = ifsp; 34338887Stegge INTON; 34438887Stegge } 34538887Stegge if (ifsfirst.begoff > endoff) 34638887Stegge ifslastp = NULL; 34738887Stegge else { 34838887Stegge ifslastp = &ifsfirst; 34938887Stegge ifsfirst.endoff = endoff; 35038887Stegge } 35138887Stegge return; 35238887Stegge } 35338887Stegge 35438887Stegge ifslastp = &ifsfirst; 35538887Stegge while (ifslastp->next && ifslastp->next->begoff < endoff) 35638887Stegge ifslastp=ifslastp->next; 35738887Stegge while (ifslastp->next != NULL) { 35838887Stegge struct ifsregion *ifsp; 35938887Stegge INTOFF; 36038887Stegge ifsp = ifslastp->next->next; 36138887Stegge ckfree(ifslastp->next); 36238887Stegge ifslastp->next = ifsp; 36338887Stegge INTON; 36438887Stegge } 36538887Stegge if (ifslastp->endoff > endoff) 36638887Stegge ifslastp->endoff = endoff; 36738887Stegge} 36838887Stegge 3691556Srgrimes/* 3701556Srgrimes * Expand arithmetic expression. Backup to start of expression, 3711556Srgrimes * evaluate, place result in (backed up) result, adjust string position. 3721556Srgrimes */ 3731556Srgrimesvoid 3741556Srgrimesexpari(flag) 37517987Speter int flag; 37617987Speter{ 3771556Srgrimes char *p, *start; 3781556Srgrimes int result; 37938887Stegge int begoff; 3801556Srgrimes int quotes = flag & (EXP_FULL | EXP_CASE); 38138887Stegge int quoted; 3821556Srgrimes 38325233Ssteve 3841556Srgrimes /* 3851556Srgrimes * This routine is slightly over-compilcated for 3861556Srgrimes * efficiency. First we make sure there is 3871556Srgrimes * enough space for the result, which may be bigger 3881556Srgrimes * than the expression if we add exponentation. Next we 3891556Srgrimes * scan backwards looking for the start of arithmetic. If the 3901556Srgrimes * next previous character is a CTLESC character, then we 3911556Srgrimes * have to rescan starting from the beginning since CTLESC 3928855Srgrimes * characters have to be processed left to right. 3931556Srgrimes */ 39422777Ssteve#if INT_MAX / 1000000000 >= 10 || INT_MIN / 1000000000 <= -10 39522777Ssteve#error "integers with more than 10 digits are not supported" 39622777Ssteve#endif 39722777Ssteve CHECKSTRSPACE(12 - 2, expdest); 3988855Srgrimes USTPUTC('\0', expdest); 3991556Srgrimes start = stackblock(); 4001556Srgrimes p = expdest; 4011556Srgrimes while (*p != CTLARI && p >= start) 4021556Srgrimes --p; 4031556Srgrimes if (*p != CTLARI) 4041556Srgrimes error("missing CTLARI (shouldn't happen)"); 4051556Srgrimes if (p > start && *(p-1) == CTLESC) 4061556Srgrimes for (p = start; *p != CTLARI; p++) 4071556Srgrimes if (*p == CTLESC) 4081556Srgrimes p++; 40938887Stegge 41038887Stegge if (p[1] == '"') 41138887Stegge quoted=1; 41238887Stegge else 41338887Stegge quoted=0; 41438887Stegge begoff = p - start; 41538887Stegge removerecordregions(begoff); 4161556Srgrimes if (quotes) 41738887Stegge rmescapes(p+2); 41838887Stegge result = arith(p+2); 41922777Ssteve fmtstr(p, 12, "%d", result); 4201556Srgrimes while (*p++) 4211556Srgrimes ; 42238887Stegge if (quoted == 0) 42338887Stegge recordregion(begoff, p - 1 - start, 0); 4241556Srgrimes result = expdest - p + 1; 4251556Srgrimes STADJUST(-result, expdest); 4261556Srgrimes} 4271556Srgrimes 4281556Srgrimes 4291556Srgrimes/* 4301556Srgrimes * Expand stuff in backwards quotes. 4311556Srgrimes */ 4321556Srgrimes 4331556SrgrimesSTATIC void 4341556Srgrimesexpbackq(cmd, quoted, flag) 4351556Srgrimes union node *cmd; 43617987Speter int quoted; 43717987Speter int flag; 43817987Speter{ 4391556Srgrimes struct backcmd in; 4401556Srgrimes int i; 4411556Srgrimes char buf[128]; 4421556Srgrimes char *p; 4431556Srgrimes char *dest = expdest; 4441556Srgrimes struct ifsregion saveifs, *savelastp; 4451556Srgrimes struct nodelist *saveargbackq; 4461556Srgrimes char lastc; 4471556Srgrimes int startloc = dest - stackblock(); 4481556Srgrimes char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 4491556Srgrimes int saveherefd; 4501556Srgrimes int quotes = flag & (EXP_FULL | EXP_CASE); 4511556Srgrimes 4521556Srgrimes INTOFF; 4531556Srgrimes saveifs = ifsfirst; 4541556Srgrimes savelastp = ifslastp; 4551556Srgrimes saveargbackq = argbackq; 4568855Srgrimes saveherefd = herefd; 4571556Srgrimes herefd = -1; 4581556Srgrimes p = grabstackstr(dest); 4591556Srgrimes evalbackcmd(cmd, &in); 4601556Srgrimes ungrabstackstr(p, dest); 4611556Srgrimes ifsfirst = saveifs; 4621556Srgrimes ifslastp = savelastp; 4631556Srgrimes argbackq = saveargbackq; 4641556Srgrimes herefd = saveherefd; 4651556Srgrimes 4661556Srgrimes p = in.buf; 4671556Srgrimes lastc = '\0'; 4681556Srgrimes for (;;) { 4691556Srgrimes if (--in.nleft < 0) { 4701556Srgrimes if (in.fd < 0) 4711556Srgrimes break; 4721556Srgrimes while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 4731556Srgrimes TRACE(("expbackq: read returns %d\n", i)); 4741556Srgrimes if (i <= 0) 4751556Srgrimes break; 4761556Srgrimes p = buf; 4771556Srgrimes in.nleft = i - 1; 4781556Srgrimes } 4791556Srgrimes lastc = *p++; 4801556Srgrimes if (lastc != '\0') { 4811556Srgrimes if (quotes && syntax[lastc] == CCTL) 4821556Srgrimes STPUTC(CTLESC, dest); 4831556Srgrimes STPUTC(lastc, dest); 4841556Srgrimes } 4851556Srgrimes } 48617987Speter 48717987Speter /* Eat all trailing newlines */ 48817987Speter for (p--; lastc == '\n'; lastc = *--p) 4891556Srgrimes STUNPUTC(dest); 49017987Speter 4911556Srgrimes if (in.fd >= 0) 4921556Srgrimes close(in.fd); 4931556Srgrimes if (in.buf) 4941556Srgrimes ckfree(in.buf); 4951556Srgrimes if (in.jp) 4961556Srgrimes exitstatus = waitforjob(in.jp); 4971556Srgrimes if (quoted == 0) 4981556Srgrimes recordregion(startloc, dest - stackblock(), 0); 4991556Srgrimes TRACE(("evalbackq: size=%d: \"%.*s\"\n", 5001556Srgrimes (dest - stackblock()) - startloc, 5011556Srgrimes (dest - stackblock()) - startloc, 5021556Srgrimes stackblock() + startloc)); 5031556Srgrimes expdest = dest; 5041556Srgrimes INTON; 5051556Srgrimes} 5061556Srgrimes 5071556Srgrimes 5081556Srgrimes 50917987SpeterSTATIC int 51020425Sstevesubevalvar(p, str, strloc, subtype, startloc, varflags) 51117987Speter char *p; 51217987Speter char *str; 51320425Ssteve int strloc; 51417987Speter int subtype; 51517987Speter int startloc; 51617987Speter int varflags; 51717987Speter{ 51817987Speter char *startp; 51917987Speter char *loc = NULL; 52045514Stegge char *q; 52117987Speter int c = 0; 52217987Speter int saveherefd = herefd; 52317987Speter struct nodelist *saveargbackq = argbackq; 52420425Ssteve int amount; 52520425Ssteve 52617987Speter herefd = -1; 52717987Speter argstr(p, 0); 52817987Speter STACKSTRNUL(expdest); 52917987Speter herefd = saveherefd; 53017987Speter argbackq = saveargbackq; 53117987Speter startp = stackblock() + startloc; 53220425Ssteve if (str == NULL) 53320425Ssteve str = stackblock() + strloc; 53417987Speter 53517987Speter switch (subtype) { 53617987Speter case VSASSIGN: 53717987Speter setvar(str, startp, 0); 53820425Ssteve amount = startp - expdest; 53920425Ssteve STADJUST(amount, expdest); 54017987Speter varflags &= ~VSNUL; 54117987Speter if (c != 0) 54217987Speter *loc = c; 54317987Speter return 1; 54417987Speter 54517987Speter case VSQUESTION: 54617987Speter if (*p != CTLENDVAR) { 54717987Speter outfmt(&errout, "%s\n", startp); 54817987Speter error((char *)NULL); 54917987Speter } 55017987Speter error("%.*s: parameter %snot set", p - str - 1, 55117987Speter str, (varflags & VSNUL) ? "null or " 55217987Speter : nullstr); 55317987Speter return 0; 55417987Speter 55517987Speter case VSTRIMLEFT: 55625233Ssteve for (loc = startp; loc < str; loc++) { 55717987Speter c = *loc; 55817987Speter *loc = '\0'; 55945514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 56017987Speter *loc = c; 56117987Speter goto recordleft; 56217987Speter } 56317987Speter *loc = c; 56445514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 56545514Stegge loc++; 56617987Speter } 56717987Speter return 0; 56817987Speter 56917987Speter case VSTRIMLEFTMAX: 57045514Stegge for (loc = str - 1; loc >= startp;) { 57117987Speter c = *loc; 57217987Speter *loc = '\0'; 57345514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 57417987Speter *loc = c; 57517987Speter goto recordleft; 57617987Speter } 57717987Speter *loc = c; 57845514Stegge loc--; 57945514Stegge if ((varflags & VSQUOTE) && loc > startp && 58045514Stegge *(loc - 1) == CTLESC) { 58145514Stegge for (q = startp; q < loc; q++) 58245514Stegge if (*q == CTLESC) 58345514Stegge q++; 58445514Stegge if (q > loc) 58545514Stegge loc--; 58645514Stegge } 58717987Speter } 58817987Speter return 0; 58917987Speter 59017987Speter case VSTRIMRIGHT: 59145514Stegge for (loc = str - 1; loc >= startp;) { 59245514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 59320425Ssteve amount = loc - expdest; 59420425Ssteve STADJUST(amount, expdest); 59517987Speter return 1; 59617987Speter } 59745514Stegge loc--; 59845514Stegge if ((varflags & VSQUOTE) && loc > startp && 59945514Stegge *(loc - 1) == CTLESC) { 60045514Stegge for (q = startp; q < loc; q++) 60145514Stegge if (*q == CTLESC) 60245514Stegge q++; 60345514Stegge if (q > loc) 60445514Stegge loc--; 60545514Stegge } 60617987Speter } 60717987Speter return 0; 60817987Speter 60917987Speter case VSTRIMRIGHTMAX: 61017987Speter for (loc = startp; loc < str - 1; loc++) { 61145514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 61220425Ssteve amount = loc - expdest; 61320425Ssteve STADJUST(amount, expdest); 61417987Speter return 1; 61517987Speter } 61645514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 61745514Stegge loc++; 61817987Speter } 61917987Speter return 0; 62017987Speter 62117987Speter 62217987Speter default: 62317987Speter abort(); 62417987Speter } 62517987Speter 62617987Speterrecordleft: 62720425Ssteve amount = ((str - 1) - (loc - startp)) - expdest; 62820425Ssteve STADJUST(amount, expdest); 62917987Speter while (loc != str - 1) 63017987Speter *startp++ = *loc++; 63117987Speter return 1; 63217987Speter} 63317987Speter 63417987Speter 6351556Srgrimes/* 6361556Srgrimes * Expand a variable, and return a pointer to the next character in the 6371556Srgrimes * input string. 6381556Srgrimes */ 6391556Srgrimes 6401556SrgrimesSTATIC char * 6411556Srgrimesevalvar(p, flag) 6421556Srgrimes char *p; 64317987Speter int flag; 64417987Speter{ 6451556Srgrimes int subtype; 6461556Srgrimes int varflags; 6471556Srgrimes char *var; 6481556Srgrimes char *val; 64917987Speter char *pat; 6501556Srgrimes int c; 6511556Srgrimes int set; 6521556Srgrimes int special; 6531556Srgrimes int startloc; 65417987Speter int varlen; 65517987Speter int easy; 6561556Srgrimes int quotes = flag & (EXP_FULL | EXP_CASE); 6571556Srgrimes 6581556Srgrimes varflags = *p++; 6591556Srgrimes subtype = varflags & VSTYPE; 6601556Srgrimes var = p; 6611556Srgrimes special = 0; 6621556Srgrimes if (! is_name(*p)) 6631556Srgrimes special = 1; 6641556Srgrimes p = strchr(p, '=') + 1; 6651556Srgrimesagain: /* jump here after setting a variable with ${var=text} */ 6661556Srgrimes if (special) { 66725233Ssteve set = varisset(var, varflags & VSNUL); 6681556Srgrimes val = NULL; 6691556Srgrimes } else { 6701556Srgrimes val = lookupvar(var); 67117987Speter if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 6721556Srgrimes val = NULL; 6731556Srgrimes set = 0; 6741556Srgrimes } else 6751556Srgrimes set = 1; 6761556Srgrimes } 67717987Speter varlen = 0; 6781556Srgrimes startloc = expdest - stackblock(); 6791556Srgrimes if (set && subtype != VSPLUS) { 6801556Srgrimes /* insert the value of the variable */ 6811556Srgrimes if (special) { 68218202Speter varvalue(var, varflags & VSQUOTE, flag & EXP_FULL); 68317987Speter if (subtype == VSLENGTH) { 68425233Ssteve varlen = expdest - stackblock() - startloc; 68525233Ssteve STADJUST(-varlen, expdest); 68617987Speter } 6871556Srgrimes } else { 68820425Ssteve char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 68917987Speter : BASESYNTAX; 6901556Srgrimes 69117987Speter if (subtype == VSLENGTH) { 69217987Speter for (;*val; val++) 69317987Speter varlen++; 6941556Srgrimes } 69517987Speter else { 69617987Speter while (*val) { 69717987Speter if (quotes && syntax[*val] == CCTL) 69817987Speter STPUTC(CTLESC, expdest); 69917987Speter STPUTC(*val++, expdest); 70017987Speter } 70117987Speter 70217987Speter } 7031556Srgrimes } 7041556Srgrimes } 70520425Ssteve 7061556Srgrimes if (subtype == VSPLUS) 7071556Srgrimes set = ! set; 70817987Speter 70920425Ssteve easy = ((varflags & VSQUOTE) == 0 || 71017987Speter (*var == '@' && shellparam.nparam != 1)); 71117987Speter 71217987Speter 71317987Speter switch (subtype) { 71417987Speter case VSLENGTH: 71517987Speter expdest = cvtnum(varlen, expdest); 71617987Speter goto record; 71717987Speter 71817987Speter case VSNORMAL: 71917987Speter if (!easy) 72017987Speter break; 72117987Speterrecord: 72220425Ssteve recordregion(startloc, expdest - stackblock(), 72317987Speter varflags & VSQUOTE); 72417987Speter break; 72517987Speter 72617987Speter case VSPLUS: 72717987Speter case VSMINUS: 72817987Speter if (!set) { 7291556Srgrimes argstr(p, flag); 73017987Speter break; 73117987Speter } 73217987Speter if (easy) 73317987Speter goto record; 73417987Speter break; 73517987Speter 73617987Speter case VSTRIMLEFT: 73717987Speter case VSTRIMLEFTMAX: 73817987Speter case VSTRIMRIGHT: 73917987Speter case VSTRIMRIGHTMAX: 74017987Speter if (!set) 74117987Speter break; 74217987Speter /* 74317987Speter * Terminate the string and start recording the pattern 74417987Speter * right after it 74517987Speter */ 74617987Speter STPUTC('\0', expdest); 74717987Speter pat = expdest; 74820425Ssteve if (subevalvar(p, NULL, expdest - stackblock(), subtype, 74938887Stegge startloc, varflags) == 0) { 75025233Ssteve int amount = (expdest - pat) + 1; 75125233Ssteve STADJUST(-amount, expdest); 75225233Ssteve } 75338887Stegge /* Remove any recorded regions beyond start of variable */ 75438887Stegge removerecordregions(startloc); 75538887Stegge goto record; 75617987Speter 75717987Speter case VSASSIGN: 75817987Speter case VSQUESTION: 75917987Speter if (!set) { 76020425Ssteve if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 76120425Ssteve varflags &= ~VSNUL; 76238887Stegge /* 76338887Stegge * Remove any recorded regions beyond 76438887Stegge * start of variable 76538887Stegge */ 76638887Stegge removerecordregions(startloc); 7671556Srgrimes goto again; 76820425Ssteve } 76917987Speter break; 7701556Srgrimes } 77117987Speter if (easy) 77217987Speter goto record; 77317987Speter break; 77417987Speter 77517987Speter default: 77617987Speter abort(); 7771556Srgrimes } 77817987Speter 7791556Srgrimes if (subtype != VSNORMAL) { /* skip to end of alternative */ 7801556Srgrimes int nesting = 1; 7811556Srgrimes for (;;) { 7821556Srgrimes if ((c = *p++) == CTLESC) 7831556Srgrimes p++; 7841556Srgrimes else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 7851556Srgrimes if (set) 7861556Srgrimes argbackq = argbackq->next; 7871556Srgrimes } else if (c == CTLVAR) { 7881556Srgrimes if ((*p++ & VSTYPE) != VSNORMAL) 7891556Srgrimes nesting++; 7901556Srgrimes } else if (c == CTLENDVAR) { 7911556Srgrimes if (--nesting == 0) 7921556Srgrimes break; 7931556Srgrimes } 7941556Srgrimes } 7951556Srgrimes } 7961556Srgrimes return p; 7971556Srgrimes} 7981556Srgrimes 7991556Srgrimes 8001556Srgrimes 8011556Srgrimes/* 8021556Srgrimes * Test whether a specialized variable is set. 8031556Srgrimes */ 8041556Srgrimes 8051556SrgrimesSTATIC int 80625233Sstevevarisset(name, nulok) 80718202Speter char *name; 80825233Ssteve int nulok; 80925233Ssteve{ 8101556Srgrimes 81125233Ssteve if (*name == '!') 81225233Ssteve return backgndpid != -1; 81325233Ssteve else if (*name == '@' || *name == '*') { 8141556Srgrimes if (*shellparam.p == NULL) 8151556Srgrimes return 0; 81625233Ssteve 81725233Ssteve if (nulok) { 81825233Ssteve char **av; 81925233Ssteve 82025233Ssteve for (av = shellparam.p; *av; av++) 82125233Ssteve if (**av != '\0') 82225233Ssteve return 1; 82325233Ssteve return 0; 82425233Ssteve } 82518202Speter } else if (is_digit(*name)) { 82625233Ssteve char *ap; 82720425Ssteve int num = atoi(name); 82825233Ssteve 82925233Ssteve if (num > shellparam.nparam) 83025233Ssteve return 0; 83125233Ssteve 83225233Ssteve if (num == 0) 83325233Ssteve ap = arg0; 83425233Ssteve else 83525233Ssteve ap = shellparam.p[num - 1]; 83625233Ssteve 83725233Ssteve if (nulok && (ap == NULL || *ap == '\0')) 83825233Ssteve return 0; 8391556Srgrimes } 8401556Srgrimes return 1; 8411556Srgrimes} 8421556Srgrimes 8431556Srgrimes 8441556Srgrimes 8451556Srgrimes/* 8461556Srgrimes * Add the value of a specialized variable to the stack string. 8471556Srgrimes */ 8481556Srgrimes 8491556SrgrimesSTATIC void 8501556Srgrimesvarvalue(name, quoted, allow_split) 85118202Speter char *name; 85217987Speter int quoted; 85317987Speter int allow_split; 85417987Speter{ 8551556Srgrimes int num; 8561556Srgrimes char *p; 8571556Srgrimes int i; 85817987Speter extern int oexitstatus; 8591556Srgrimes char sep; 8601556Srgrimes char **ap; 8611556Srgrimes char const *syntax; 8621556Srgrimes 8631556Srgrimes#define STRTODEST(p) \ 8641556Srgrimes do {\ 8651556Srgrimes if (allow_split) { \ 8661556Srgrimes syntax = quoted? DQSYNTAX : BASESYNTAX; \ 8671556Srgrimes while (*p) { \ 8681556Srgrimes if (syntax[*p] == CCTL) \ 8691556Srgrimes STPUTC(CTLESC, expdest); \ 8701556Srgrimes STPUTC(*p++, expdest); \ 8711556Srgrimes } \ 8721556Srgrimes } else \ 8731556Srgrimes while (*p) \ 8741556Srgrimes STPUTC(*p++, expdest); \ 8751556Srgrimes } while (0) 8761556Srgrimes 8771556Srgrimes 87818202Speter switch (*name) { 8791556Srgrimes case '$': 8801556Srgrimes num = rootpid; 8811556Srgrimes goto numvar; 8821556Srgrimes case '?': 88317987Speter num = oexitstatus; 8841556Srgrimes goto numvar; 8851556Srgrimes case '#': 8861556Srgrimes num = shellparam.nparam; 8871556Srgrimes goto numvar; 8881556Srgrimes case '!': 8891556Srgrimes num = backgndpid; 8901556Srgrimesnumvar: 89117987Speter expdest = cvtnum(num, expdest); 8921556Srgrimes break; 8931556Srgrimes case '-': 8941556Srgrimes for (i = 0 ; i < NOPTS ; i++) { 8951556Srgrimes if (optlist[i].val) 8961556Srgrimes STPUTC(optlist[i].letter, expdest); 8971556Srgrimes } 8981556Srgrimes break; 8991556Srgrimes case '@': 90038887Stegge if (allow_split && quoted) { 90138887Stegge for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 90238887Stegge STRTODEST(p); 90338887Stegge if (*ap) 90438887Stegge STPUTC('\0', expdest); 90538887Stegge } 90638887Stegge break; 9071556Srgrimes } 9088855Srgrimes /* fall through */ 9091556Srgrimes case '*': 91038887Stegge if (ifsset() != 0) 91138887Stegge sep = ifsval()[0]; 91238887Stegge else 91338887Stegge sep = ' '; 9141556Srgrimes for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 9151556Srgrimes STRTODEST(p); 91638887Stegge if (*ap && sep) 9171556Srgrimes STPUTC(sep, expdest); 9181556Srgrimes } 9191556Srgrimes break; 9201556Srgrimes case '0': 9211556Srgrimes p = arg0; 9221556Srgrimes STRTODEST(p); 9231556Srgrimes break; 9241556Srgrimes default: 92518202Speter if (is_digit(*name)) { 92618202Speter num = atoi(name); 92718202Speter if (num > 0 && num <= shellparam.nparam) { 92818202Speter p = shellparam.p[num - 1]; 92918202Speter STRTODEST(p); 93018202Speter } 9311556Srgrimes } 9321556Srgrimes break; 9331556Srgrimes } 9341556Srgrimes} 9351556Srgrimes 9361556Srgrimes 9371556Srgrimes 9381556Srgrimes/* 9391556Srgrimes * Record the the fact that we have to scan this region of the 9401556Srgrimes * string for IFS characters. 9411556Srgrimes */ 9421556Srgrimes 9431556SrgrimesSTATIC void 94420425Ssteverecordregion(start, end, nulonly) 94517987Speter int start; 94617987Speter int end; 94717987Speter int nulonly; 94817987Speter{ 94925233Ssteve struct ifsregion *ifsp; 9501556Srgrimes 9511556Srgrimes if (ifslastp == NULL) { 9521556Srgrimes ifsp = &ifsfirst; 9531556Srgrimes } else { 9541556Srgrimes ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 9551556Srgrimes ifslastp->next = ifsp; 9561556Srgrimes } 9571556Srgrimes ifslastp = ifsp; 9581556Srgrimes ifslastp->next = NULL; 9591556Srgrimes ifslastp->begoff = start; 9601556Srgrimes ifslastp->endoff = end; 9611556Srgrimes ifslastp->nulonly = nulonly; 9621556Srgrimes} 9631556Srgrimes 9641556Srgrimes 9651556Srgrimes 9661556Srgrimes/* 9671556Srgrimes * Break the argument string into pieces based upon IFS and add the 9681556Srgrimes * strings to the argument list. The regions of the string to be 9691556Srgrimes * searched for IFS characters have been stored by recordregion. 9701556Srgrimes */ 9711556SrgrimesSTATIC void 9721556Srgrimesifsbreakup(string, arglist) 9731556Srgrimes char *string; 9741556Srgrimes struct arglist *arglist; 9751556Srgrimes { 9761556Srgrimes struct ifsregion *ifsp; 9771556Srgrimes struct strlist *sp; 9781556Srgrimes char *start; 97925233Ssteve char *p; 9801556Srgrimes char *q; 9811556Srgrimes char *ifs; 98217987Speter int ifsspc; 98338887Stegge int nulonly; 9841556Srgrimes 98517987Speter 9861556Srgrimes start = string; 98738887Stegge ifsspc = 0; 98838887Stegge nulonly = 0; 9891556Srgrimes if (ifslastp != NULL) { 9901556Srgrimes ifsp = &ifsfirst; 9911556Srgrimes do { 9921556Srgrimes p = string + ifsp->begoff; 99338887Stegge nulonly = ifsp->nulonly; 99438887Stegge ifs = nulonly ? nullstr : 99538887Stegge ( ifsset() ? ifsval() : " \t\n" ); 99638887Stegge ifsspc = 0; 9971556Srgrimes while (p < string + ifsp->endoff) { 9981556Srgrimes q = p; 9991556Srgrimes if (*p == CTLESC) 10001556Srgrimes p++; 100138887Stegge if (strchr(ifs, *p)) { 100238887Stegge if (!nulonly) 100338887Stegge ifsspc = (strchr(" \t\n", *p) != NULL); 100438887Stegge /* Ignore IFS whitespace at start */ 100538887Stegge if (q == start && ifsspc) { 100638887Stegge p++; 100738887Stegge start = p; 100838887Stegge continue; 10091556Srgrimes } 101038887Stegge *q = '\0'; 101138887Stegge sp = (struct strlist *)stalloc(sizeof *sp); 101238887Stegge sp->text = start; 101338887Stegge *arglist->lastp = sp; 101438887Stegge arglist->lastp = &sp->next; 101538887Stegge p++; 101638887Stegge if (!nulonly) { 10171556Srgrimes for (;;) { 101838887Stegge if (p >= string + ifsp->endoff) { 10191556Srgrimes break; 102038887Stegge } 10211556Srgrimes q = p; 10221556Srgrimes if (*p == CTLESC) 10231556Srgrimes p++; 102438887Stegge if (strchr(ifs, *p) == NULL ) { 10251556Srgrimes p = q; 10261556Srgrimes break; 102738887Stegge } else if (strchr(" \t\n",*p) == NULL) { 102838887Stegge if (ifsspc) { 102938887Stegge p++; 103038887Stegge ifsspc = 0; 103138887Stegge } else { 103238887Stegge p = q; 103338887Stegge break; 103438887Stegge } 103538887Stegge } else 103638887Stegge p++; 10371556Srgrimes } 10381556Srgrimes } 10391556Srgrimes start = p; 104038887Stegge } else 104138887Stegge p++; 10421556Srgrimes } 10431556Srgrimes } while ((ifsp = ifsp->next) != NULL); 104438887Stegge if (*start || (!ifsspc && start > string && 104538887Stegge (nulonly || 1))) { 10461556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10471556Srgrimes sp->text = start; 10481556Srgrimes *arglist->lastp = sp; 10491556Srgrimes arglist->lastp = &sp->next; 10501556Srgrimes } 10511556Srgrimes } else { 10521556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10531556Srgrimes sp->text = start; 10541556Srgrimes *arglist->lastp = sp; 10551556Srgrimes arglist->lastp = &sp->next; 10561556Srgrimes } 10571556Srgrimes} 10581556Srgrimes 10591556Srgrimes 10601556Srgrimes 10611556Srgrimes/* 10621556Srgrimes * Expand shell metacharacters. At this point, the only control characters 10631556Srgrimes * should be escapes. The results are stored in the list exparg. 10641556Srgrimes */ 10651556Srgrimes 10661556Srgrimeschar *expdir; 10671556Srgrimes 10681556Srgrimes 10691556SrgrimesSTATIC void 10701556Srgrimesexpandmeta(str, flag) 10711556Srgrimes struct strlist *str; 107225905Ssteve int flag __unused; 107317987Speter{ 10741556Srgrimes char *p; 10751556Srgrimes struct strlist **savelastp; 10761556Srgrimes struct strlist *sp; 10771556Srgrimes char c; 10781556Srgrimes /* TODO - EXP_REDIR */ 10791556Srgrimes 10801556Srgrimes while (str) { 10811556Srgrimes if (fflag) 10821556Srgrimes goto nometa; 10831556Srgrimes p = str->text; 10841556Srgrimes for (;;) { /* fast check for meta chars */ 10851556Srgrimes if ((c = *p++) == '\0') 10861556Srgrimes goto nometa; 10871556Srgrimes if (c == '*' || c == '?' || c == '[' || c == '!') 10881556Srgrimes break; 10891556Srgrimes } 10901556Srgrimes savelastp = exparg.lastp; 10911556Srgrimes INTOFF; 10921556Srgrimes if (expdir == NULL) { 10931556Srgrimes int i = strlen(str->text); 10941556Srgrimes expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */ 10951556Srgrimes } 10961556Srgrimes 10971556Srgrimes expmeta(expdir, str->text); 10981556Srgrimes ckfree(expdir); 10991556Srgrimes expdir = NULL; 11001556Srgrimes INTON; 11011556Srgrimes if (exparg.lastp == savelastp) { 11028855Srgrimes /* 11038855Srgrimes * no matches 11041556Srgrimes */ 11051556Srgrimesnometa: 11061556Srgrimes *exparg.lastp = str; 11071556Srgrimes rmescapes(str->text); 11081556Srgrimes exparg.lastp = &str->next; 11091556Srgrimes } else { 11101556Srgrimes *exparg.lastp = NULL; 11111556Srgrimes *savelastp = sp = expsort(*savelastp); 11121556Srgrimes while (sp->next != NULL) 11131556Srgrimes sp = sp->next; 11141556Srgrimes exparg.lastp = &sp->next; 11151556Srgrimes } 11161556Srgrimes str = str->next; 11171556Srgrimes } 11181556Srgrimes} 11191556Srgrimes 11201556Srgrimes 11211556Srgrimes/* 11221556Srgrimes * Do metacharacter (i.e. *, ?, [...]) expansion. 11231556Srgrimes */ 11241556Srgrimes 11251556SrgrimesSTATIC void 11261556Srgrimesexpmeta(enddir, name) 11271556Srgrimes char *enddir; 11281556Srgrimes char *name; 11291556Srgrimes { 113025233Ssteve char *p; 11311556Srgrimes char *q; 11321556Srgrimes char *start; 11331556Srgrimes char *endname; 11341556Srgrimes int metaflag; 11351556Srgrimes struct stat statb; 11361556Srgrimes DIR *dirp; 11371556Srgrimes struct dirent *dp; 11381556Srgrimes int atend; 11391556Srgrimes int matchdot; 11401556Srgrimes 11411556Srgrimes metaflag = 0; 11421556Srgrimes start = name; 11431556Srgrimes for (p = name ; ; p++) { 11441556Srgrimes if (*p == '*' || *p == '?') 11451556Srgrimes metaflag = 1; 11461556Srgrimes else if (*p == '[') { 11471556Srgrimes q = p + 1; 114826488Sache if (*q == '!' || *q == '^') 11491556Srgrimes q++; 11501556Srgrimes for (;;) { 115138887Stegge while (*q == CTLQUOTEMARK) 115238887Stegge q++; 11531556Srgrimes if (*q == CTLESC) 11541556Srgrimes q++; 11551556Srgrimes if (*q == '/' || *q == '\0') 11561556Srgrimes break; 11571556Srgrimes if (*++q == ']') { 11581556Srgrimes metaflag = 1; 11591556Srgrimes break; 11601556Srgrimes } 11611556Srgrimes } 11621556Srgrimes } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) { 11631556Srgrimes metaflag = 1; 11641556Srgrimes } else if (*p == '\0') 11651556Srgrimes break; 116638887Stegge else if (*p == CTLQUOTEMARK) 116738887Stegge continue; 11681556Srgrimes else if (*p == CTLESC) 11691556Srgrimes p++; 11701556Srgrimes if (*p == '/') { 11711556Srgrimes if (metaflag) 11721556Srgrimes break; 11731556Srgrimes start = p + 1; 11741556Srgrimes } 11751556Srgrimes } 11761556Srgrimes if (metaflag == 0) { /* we've reached the end of the file name */ 11771556Srgrimes if (enddir != expdir) 11781556Srgrimes metaflag++; 11791556Srgrimes for (p = name ; ; p++) { 118038887Stegge if (*p == CTLQUOTEMARK) 118138887Stegge continue; 11821556Srgrimes if (*p == CTLESC) 11831556Srgrimes p++; 11841556Srgrimes *enddir++ = *p; 11851556Srgrimes if (*p == '\0') 11861556Srgrimes break; 11871556Srgrimes } 11881556Srgrimes if (metaflag == 0 || stat(expdir, &statb) >= 0) 11891556Srgrimes addfname(expdir); 11901556Srgrimes return; 11911556Srgrimes } 11921556Srgrimes endname = p; 11931556Srgrimes if (start != name) { 11941556Srgrimes p = name; 11951556Srgrimes while (p < start) { 119638887Stegge while (*p == CTLQUOTEMARK) 119738887Stegge p++; 11981556Srgrimes if (*p == CTLESC) 11991556Srgrimes p++; 12001556Srgrimes *enddir++ = *p++; 12011556Srgrimes } 12021556Srgrimes } 12031556Srgrimes if (enddir == expdir) { 12041556Srgrimes p = "."; 12051556Srgrimes } else if (enddir == expdir + 1 && *expdir == '/') { 12061556Srgrimes p = "/"; 12071556Srgrimes } else { 12081556Srgrimes p = expdir; 12091556Srgrimes enddir[-1] = '\0'; 12101556Srgrimes } 12111556Srgrimes if ((dirp = opendir(p)) == NULL) 12121556Srgrimes return; 12131556Srgrimes if (enddir != expdir) 12141556Srgrimes enddir[-1] = '/'; 12151556Srgrimes if (*endname == 0) { 12161556Srgrimes atend = 1; 12171556Srgrimes } else { 12181556Srgrimes atend = 0; 12191556Srgrimes *endname++ = '\0'; 12201556Srgrimes } 12211556Srgrimes matchdot = 0; 122238887Stegge p = start; 122338887Stegge while (*p == CTLQUOTEMARK) 122438887Stegge p++; 122538887Stegge if (*p == CTLESC) 122638887Stegge p++; 122738887Stegge if (*p == '.') 12281556Srgrimes matchdot++; 12291556Srgrimes while (! int_pending() && (dp = readdir(dirp)) != NULL) { 12301556Srgrimes if (dp->d_name[0] == '.' && ! matchdot) 12311556Srgrimes continue; 123245514Stegge if (patmatch(start, dp->d_name, 0)) { 12331556Srgrimes if (atend) { 12341556Srgrimes scopy(dp->d_name, enddir); 12351556Srgrimes addfname(expdir); 12361556Srgrimes } else { 12371556Srgrimes char *q; 123817987Speter for (p = enddir, q = dp->d_name; 123917987Speter (*p++ = *q++) != '\0';) 124017987Speter continue; 12411556Srgrimes p[-1] = '/'; 12421556Srgrimes expmeta(p, endname); 12431556Srgrimes } 12441556Srgrimes } 12451556Srgrimes } 12461556Srgrimes closedir(dirp); 12471556Srgrimes if (! atend) 12481556Srgrimes endname[-1] = '/'; 12491556Srgrimes} 12501556Srgrimes 12511556Srgrimes 12521556Srgrimes/* 12531556Srgrimes * Add a file name to the list. 12541556Srgrimes */ 12551556Srgrimes 12561556SrgrimesSTATIC void 12571556Srgrimesaddfname(name) 12581556Srgrimes char *name; 12591556Srgrimes { 12601556Srgrimes char *p; 12611556Srgrimes struct strlist *sp; 12621556Srgrimes 12631556Srgrimes p = stalloc(strlen(name) + 1); 12641556Srgrimes scopy(name, p); 12651556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 12661556Srgrimes sp->text = p; 12671556Srgrimes *exparg.lastp = sp; 12681556Srgrimes exparg.lastp = &sp->next; 12691556Srgrimes} 12701556Srgrimes 12711556Srgrimes 12721556Srgrimes/* 12731556Srgrimes * Sort the results of file name expansion. It calculates the number of 12741556Srgrimes * strings to sort and then calls msort (short for merge sort) to do the 12751556Srgrimes * work. 12761556Srgrimes */ 12771556Srgrimes 12781556SrgrimesSTATIC struct strlist * 12791556Srgrimesexpsort(str) 12801556Srgrimes struct strlist *str; 12811556Srgrimes { 12821556Srgrimes int len; 12831556Srgrimes struct strlist *sp; 12841556Srgrimes 12851556Srgrimes len = 0; 12861556Srgrimes for (sp = str ; sp ; sp = sp->next) 12871556Srgrimes len++; 12881556Srgrimes return msort(str, len); 12891556Srgrimes} 12901556Srgrimes 12911556Srgrimes 12921556SrgrimesSTATIC struct strlist * 12931556Srgrimesmsort(list, len) 12941556Srgrimes struct strlist *list; 129517987Speter int len; 129617987Speter{ 129717987Speter struct strlist *p, *q = NULL; 12981556Srgrimes struct strlist **lpp; 12991556Srgrimes int half; 13001556Srgrimes int n; 13011556Srgrimes 13021556Srgrimes if (len <= 1) 13031556Srgrimes return list; 13048855Srgrimes half = len >> 1; 13051556Srgrimes p = list; 13061556Srgrimes for (n = half ; --n >= 0 ; ) { 13071556Srgrimes q = p; 13081556Srgrimes p = p->next; 13091556Srgrimes } 13101556Srgrimes q->next = NULL; /* terminate first half of list */ 13111556Srgrimes q = msort(list, half); /* sort first half of list */ 13121556Srgrimes p = msort(p, len - half); /* sort second half */ 13131556Srgrimes lpp = &list; 13141556Srgrimes for (;;) { 13151556Srgrimes if (strcmp(p->text, q->text) < 0) { 13161556Srgrimes *lpp = p; 13171556Srgrimes lpp = &p->next; 13181556Srgrimes if ((p = *lpp) == NULL) { 13191556Srgrimes *lpp = q; 13201556Srgrimes break; 13211556Srgrimes } 13221556Srgrimes } else { 13231556Srgrimes *lpp = q; 13241556Srgrimes lpp = &q->next; 13251556Srgrimes if ((q = *lpp) == NULL) { 13261556Srgrimes *lpp = p; 13271556Srgrimes break; 13281556Srgrimes } 13291556Srgrimes } 13301556Srgrimes } 13311556Srgrimes return list; 13321556Srgrimes} 13331556Srgrimes 13341556Srgrimes 13351556Srgrimes 13361556Srgrimes/* 13371556Srgrimes * Returns true if the pattern matches the string. 13381556Srgrimes */ 13391556Srgrimes 13401556Srgrimesint 134145514Steggepatmatch(pattern, string, squoted) 13421556Srgrimes char *pattern; 13431556Srgrimes char *string; 134445514Stegge int squoted; /* string might have quote chars */ 13451556Srgrimes { 13461556Srgrimes#ifdef notdef 13471556Srgrimes if (pattern[0] == '!' && pattern[1] == '!') 13481556Srgrimes return 1 - pmatch(pattern + 2, string); 13491556Srgrimes else 13501556Srgrimes#endif 135145514Stegge return pmatch(pattern, string, squoted); 13521556Srgrimes} 13531556Srgrimes 135417987Speter 135517525SacheSTATIC int 135645514Steggepmatch(pattern, string, squoted) 13571556Srgrimes char *pattern; 13581556Srgrimes char *string; 135945514Stegge int squoted; 13601556Srgrimes { 136125233Ssteve char *p, *q; 136225233Ssteve char c; 13631556Srgrimes 13641556Srgrimes p = pattern; 13651556Srgrimes q = string; 13661556Srgrimes for (;;) { 13671556Srgrimes switch (c = *p++) { 13681556Srgrimes case '\0': 13691556Srgrimes goto breakloop; 13701556Srgrimes case CTLESC: 137145514Stegge if (squoted && *q == CTLESC) 137245514Stegge q++; 13731556Srgrimes if (*q++ != *p++) 13741556Srgrimes return 0; 13751556Srgrimes break; 137638887Stegge case CTLQUOTEMARK: 137738887Stegge continue; 13781556Srgrimes case '?': 137945514Stegge if (squoted && *q == CTLESC) 138045514Stegge q++; 13811556Srgrimes if (*q++ == '\0') 13821556Srgrimes return 0; 13831556Srgrimes break; 13841556Srgrimes case '*': 13851556Srgrimes c = *p; 138638887Stegge while (c == CTLQUOTEMARK || c == '*') 138738887Stegge c = *++p; 138838887Stegge if (c != CTLESC && c != CTLQUOTEMARK && 138938887Stegge c != '?' && c != '*' && c != '[') { 13901556Srgrimes while (*q != c) { 139145514Stegge if (squoted && *q == CTLESC && 139245514Stegge q[1] == c) 139345514Stegge break; 13941556Srgrimes if (*q == '\0') 13951556Srgrimes return 0; 139645514Stegge if (squoted && *q == CTLESC) 139745514Stegge q++; 13981556Srgrimes q++; 13991556Srgrimes } 14001556Srgrimes } 14011556Srgrimes do { 140245514Stegge if (pmatch(p, q, squoted)) 14031556Srgrimes return 1; 140445514Stegge if (squoted && *q == CTLESC) 140545514Stegge q++; 14061556Srgrimes } while (*q++ != '\0'); 14071556Srgrimes return 0; 14081556Srgrimes case '[': { 14091556Srgrimes char *endp; 14101556Srgrimes int invert, found; 14111556Srgrimes char chr; 14121556Srgrimes 14131556Srgrimes endp = p; 141426488Sache if (*endp == '!' || *endp == '^') 14151556Srgrimes endp++; 14161556Srgrimes for (;;) { 141738887Stegge while (*endp == CTLQUOTEMARK) 141838887Stegge endp++; 14191556Srgrimes if (*endp == '\0') 14201556Srgrimes goto dft; /* no matching ] */ 14211556Srgrimes if (*endp == CTLESC) 14221556Srgrimes endp++; 14231556Srgrimes if (*++endp == ']') 14241556Srgrimes break; 14251556Srgrimes } 14261556Srgrimes invert = 0; 142726488Sache if (*p == '!' || *p == '^') { 14281556Srgrimes invert++; 14291556Srgrimes p++; 14301556Srgrimes } 14311556Srgrimes found = 0; 14321556Srgrimes chr = *q++; 143345514Stegge if (squoted && chr == CTLESC) 143445514Stegge chr = *q++; 143517987Speter if (chr == '\0') 143617987Speter return 0; 14371556Srgrimes c = *p++; 14381556Srgrimes do { 143938887Stegge if (c == CTLQUOTEMARK) 144038887Stegge continue; 14411556Srgrimes if (c == CTLESC) 14421556Srgrimes c = *p++; 14431556Srgrimes if (*p == '-' && p[1] != ']') { 14441556Srgrimes p++; 144538887Stegge while (*p == CTLQUOTEMARK) 144638887Stegge p++; 14471556Srgrimes if (*p == CTLESC) 14481556Srgrimes p++; 144917557Sache if ( collate_range_cmp(chr, c) >= 0 145017557Sache && collate_range_cmp(chr, *p) <= 0 145117525Sache ) 14521556Srgrimes found = 1; 14531556Srgrimes p++; 14541556Srgrimes } else { 14551556Srgrimes if (chr == c) 14561556Srgrimes found = 1; 14571556Srgrimes } 14581556Srgrimes } while ((c = *p++) != ']'); 14591556Srgrimes if (found == invert) 14601556Srgrimes return 0; 14611556Srgrimes break; 14621556Srgrimes } 14631556Srgrimesdft: default: 146445514Stegge if (squoted && *q == CTLESC) 146545514Stegge q++; 14661556Srgrimes if (*q++ != c) 14671556Srgrimes return 0; 14681556Srgrimes break; 14691556Srgrimes } 14701556Srgrimes } 14711556Srgrimesbreakloop: 14721556Srgrimes if (*q != '\0') 14731556Srgrimes return 0; 14741556Srgrimes return 1; 14751556Srgrimes} 14761556Srgrimes 14771556Srgrimes 14781556Srgrimes 14791556Srgrimes/* 14801556Srgrimes * Remove any CTLESC characters from a string. 14811556Srgrimes */ 14821556Srgrimes 14831556Srgrimesvoid 14841556Srgrimesrmescapes(str) 14851556Srgrimes char *str; 148638887Stegge{ 148725233Ssteve char *p, *q; 14881556Srgrimes 14891556Srgrimes p = str; 149038887Stegge while (*p != CTLESC && *p != CTLQUOTEMARK) { 14911556Srgrimes if (*p++ == '\0') 14921556Srgrimes return; 14931556Srgrimes } 14941556Srgrimes q = p; 14951556Srgrimes while (*p) { 149638887Stegge if (*p == CTLQUOTEMARK) { 149738887Stegge p++; 149838887Stegge continue; 149938887Stegge } 15001556Srgrimes if (*p == CTLESC) 15011556Srgrimes p++; 15021556Srgrimes *q++ = *p++; 15031556Srgrimes } 15041556Srgrimes *q = '\0'; 15051556Srgrimes} 15061556Srgrimes 15071556Srgrimes 15081556Srgrimes 15091556Srgrimes/* 15101556Srgrimes * See if a pattern matches in a case statement. 15111556Srgrimes */ 15121556Srgrimes 15131556Srgrimesint 15141556Srgrimescasematch(pattern, val) 15151556Srgrimes union node *pattern; 15161556Srgrimes char *val; 15171556Srgrimes { 15181556Srgrimes struct stackmark smark; 15191556Srgrimes int result; 15201556Srgrimes char *p; 15211556Srgrimes 15221556Srgrimes setstackmark(&smark); 15231556Srgrimes argbackq = pattern->narg.backquote; 15241556Srgrimes STARTSTACKSTR(expdest); 15251556Srgrimes ifslastp = NULL; 15261556Srgrimes argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 15271556Srgrimes STPUTC('\0', expdest); 15281556Srgrimes p = grabstackstr(expdest); 152945514Stegge result = patmatch(p, val, 0); 15301556Srgrimes popstackmark(&smark); 15311556Srgrimes return result; 15321556Srgrimes} 153317987Speter 153417987Speter/* 153517987Speter * Our own itoa(). 153617987Speter */ 153717987Speter 153817987SpeterSTATIC char * 153917987Spetercvtnum(num, buf) 154017987Speter int num; 154117987Speter char *buf; 154217987Speter { 154317987Speter char temp[32]; 154417987Speter int neg = num < 0; 154517987Speter char *p = temp + 31; 154617987Speter 154717987Speter temp[31] = '\0'; 154817987Speter 154917987Speter do { 155017987Speter *--p = num % 10 + '0'; 155117987Speter } while ((num /= 10) != 0); 155217987Speter 155317987Speter if (neg) 155417987Speter *--p = '-'; 155517987Speter 155617987Speter while (*p) 155717987Speter STPUTC(*p++, buf); 155817987Speter return buf; 155917987Speter} 1560