expand.c revision 216384
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 4207944Sjilles * Copyright (c) 1997-2005 5207944Sjilles * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 61556Srgrimes * 71556Srgrimes * This code is derived from software contributed to Berkeley by 81556Srgrimes * Kenneth Almquist. 91556Srgrimes * 101556Srgrimes * Redistribution and use in source and binary forms, with or without 111556Srgrimes * modification, are permitted provided that the following conditions 121556Srgrimes * are met: 131556Srgrimes * 1. Redistributions of source code must retain the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer. 151556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161556Srgrimes * notice, this list of conditions and the following disclaimer in the 171556Srgrimes * documentation and/or other materials provided with the distribution. 181556Srgrimes * 4. Neither the name of the University nor the names of its contributors 191556Srgrimes * may be used to endorse or promote products derived from this software 201556Srgrimes * without specific prior written permission. 211556Srgrimes * 221556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 231556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 241556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 251556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 261556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 271556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 281556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 291556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 301556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 311556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 321556Srgrimes * SUCH DAMAGE. 331556Srgrimes */ 341556Srgrimes 351556Srgrimes#ifndef lint 3636150Scharnier#if 0 3736150Scharnierstatic char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; 3836150Scharnier#endif 391556Srgrimes#endif /* not lint */ 4099110Sobrien#include <sys/cdefs.h> 4199110Sobrien__FBSDID("$FreeBSD: head/bin/sh/expand.c 216384 2010-12-11 22:13:29Z jilles $"); 421556Srgrimes 4317987Speter#include <sys/types.h> 4417987Speter#include <sys/time.h> 4517987Speter#include <sys/stat.h> 46213775Sjhb#include <dirent.h> 4717987Speter#include <errno.h> 48213775Sjhb#include <inttypes.h> 49213775Sjhb#include <limits.h> 5017987Speter#include <pwd.h> 51213775Sjhb#include <stdio.h> 5217987Speter#include <stdlib.h> 53108286Stjr#include <string.h> 54213775Sjhb#include <unistd.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 */ 88194975Sjilles int inquotes; /* search for nul bytes only */ 891556Srgrimes}; 901556Srgrimes 911556Srgrimes 92213760Sobrienstatic char *expdest; /* output of current string */ 93213760Sobrienstatic struct nodelist *argbackq; /* list of back quote expressions */ 94213760Sobrienstatic struct ifsregion ifsfirst; /* first struct in list of ifs regions */ 95213760Sobrienstatic struct ifsregion *ifslastp; /* last struct in list */ 96213760Sobrienstatic struct arglist exparg; /* holds expanded arg list */ 971556Srgrimes 98213811Sobrienstatic void argstr(char *, int); 99213811Sobrienstatic char *exptilde(char *, int); 100213811Sobrienstatic void expbackq(union node *, int, int); 101214524Sjillesstatic int subevalvar(char *, char *, int, int, int, int, int); 102213811Sobrienstatic char *evalvar(char *, int); 103213811Sobrienstatic int varisset(char *, int); 104213811Sobrienstatic void varvalue(char *, int, int, int); 105213811Sobrienstatic void recordregion(int, int, int); 106213811Sobrienstatic void removerecordregions(int); 107213811Sobrienstatic void ifsbreakup(char *, struct arglist *); 108213811Sobrienstatic void expandmeta(struct strlist *, int); 109213811Sobrienstatic void expmeta(char *, char *); 110213811Sobrienstatic void addfname(char *); 111213811Sobrienstatic struct strlist *expsort(struct strlist *); 112213811Sobrienstatic struct strlist *msort(struct strlist *, int); 113213811Sobrienstatic char *cvtnum(int, char *); 114213811Sobrienstatic int collate_range_cmp(int, int); 1151556Srgrimes 116213811Sobrienstatic int 117118374Sachecollate_range_cmp(int c1, int c2) 11819281Sache{ 11919281Sache static char s1[2], s2[2]; 12019281Sache 12119281Sache s1[0] = c1; 12219281Sache s2[0] = c2; 123118374Sache return (strcoll(s1, s2)); 12419281Sache} 12519281Sache 1261556Srgrimes/* 1271556Srgrimes * Expand shell variables and backquotes inside a here document. 12890111Simp * union node *arg the document 12990111Simp * int fd; where to write the expanded version 1301556Srgrimes */ 1311556Srgrimes 1321556Srgrimesvoid 13390111Simpexpandhere(union node *arg, int fd) 13490111Simp{ 1351556Srgrimes herefd = fd; 1361556Srgrimes expandarg(arg, (struct arglist *)NULL, 0); 13739137Stegge xwrite(fd, stackblock(), expdest - stackblock()); 1381556Srgrimes} 1391556Srgrimes 140216384Sjillesstatic char * 141216384Sjillesstputs_quotes(const char *data, const char *syntax, char *p) 142216384Sjilles{ 143216384Sjilles while (*data) { 144216384Sjilles CHECKSTRSPACE(2, p); 145216384Sjilles if (syntax[(int)*data] == CCTL) 146216384Sjilles USTPUTC(CTLESC, p); 147216384Sjilles USTPUTC(*data++, p); 148216384Sjilles } 149216384Sjilles return (p); 150216384Sjilles} 151216384Sjilles#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) 1521556Srgrimes 1531556Srgrimes/* 154212243Sjilles * Perform expansions on an argument, placing the resulting list of arguments 155212243Sjilles * in arglist. Parameter expansion, command substitution and arithmetic 156212243Sjilles * expansion are always performed; additional expansions can be requested 157212243Sjilles * via flag (EXP_*). 158212243Sjilles * The result is left in the stack string. 159212243Sjilles * When arglist is NULL, perform here document expansion. A partial result 160212243Sjilles * may be written to herefd, which is then not included in the stack string. 161212243Sjilles * 162212243Sjilles * Caution: this function uses global state and is not reentrant. 163212243Sjilles * However, a new invocation after an interrupted invocation is safe 164212243Sjilles * and will reset the global state for the new call. 1651556Srgrimes */ 1661556Srgrimesvoid 16790111Simpexpandarg(union node *arg, struct arglist *arglist, int flag) 16817987Speter{ 1691556Srgrimes struct strlist *sp; 1701556Srgrimes char *p; 1711556Srgrimes 1721556Srgrimes argbackq = arg->narg.backquote; 1731556Srgrimes STARTSTACKSTR(expdest); 1741556Srgrimes ifsfirst.next = NULL; 1751556Srgrimes ifslastp = NULL; 1761556Srgrimes argstr(arg->narg.text, flag); 1771556Srgrimes if (arglist == NULL) { 1781556Srgrimes return; /* here document expanded */ 1791556Srgrimes } 1801556Srgrimes STPUTC('\0', expdest); 1811556Srgrimes p = grabstackstr(expdest); 1821556Srgrimes exparg.lastp = &exparg.list; 1831556Srgrimes /* 1841556Srgrimes * TODO - EXP_REDIR 1851556Srgrimes */ 1861556Srgrimes if (flag & EXP_FULL) { 1871556Srgrimes ifsbreakup(p, &exparg); 1881556Srgrimes *exparg.lastp = NULL; 1891556Srgrimes exparg.lastp = &exparg.list; 1901556Srgrimes expandmeta(exparg.list, flag); 1911556Srgrimes } else { 1921556Srgrimes if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 1931556Srgrimes rmescapes(p); 1941556Srgrimes sp = (struct strlist *)stalloc(sizeof (struct strlist)); 1951556Srgrimes sp->text = p; 1961556Srgrimes *exparg.lastp = sp; 1971556Srgrimes exparg.lastp = &sp->next; 1981556Srgrimes } 1991556Srgrimes while (ifsfirst.next != NULL) { 2001556Srgrimes struct ifsregion *ifsp; 2011556Srgrimes INTOFF; 2021556Srgrimes ifsp = ifsfirst.next->next; 2031556Srgrimes ckfree(ifsfirst.next); 2041556Srgrimes ifsfirst.next = ifsp; 2051556Srgrimes INTON; 2061556Srgrimes } 2071556Srgrimes *exparg.lastp = NULL; 2081556Srgrimes if (exparg.list) { 2091556Srgrimes *arglist->lastp = exparg.list; 2101556Srgrimes arglist->lastp = exparg.lastp; 2111556Srgrimes } 2121556Srgrimes} 2131556Srgrimes 2141556Srgrimes 2151556Srgrimes 2161556Srgrimes/* 217212243Sjilles * Perform parameter expansion, command substitution and arithmetic 218212243Sjilles * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 219212243Sjilles * Processing ends at a CTLENDVAR character as well as '\0'. 220212243Sjilles * This is used to expand word in ${var+word} etc. 221212243Sjilles * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 222212243Sjilles * characters to allow for further processing. 223212243Sjilles * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 2241556Srgrimes */ 225213811Sobrienstatic void 22690111Simpargstr(char *p, int flag) 22717987Speter{ 22825233Ssteve char c; 229104672Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 2301556Srgrimes int firsteq = 1; 231214512Sjilles int split_lit; 232214512Sjilles int lit_quoted; 2331556Srgrimes 234214512Sjilles split_lit = flag & EXP_SPLIT_LIT; 235214512Sjilles lit_quoted = flag & EXP_LIT_QUOTED; 236214512Sjilles flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); 2371556Srgrimes if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 2381556Srgrimes p = exptilde(p, flag); 2391556Srgrimes for (;;) { 240215783Sjilles CHECKSTRSPACE(2, expdest); 2411556Srgrimes switch (c = *p++) { 2421556Srgrimes case '\0': 243212243Sjilles case CTLENDVAR: 2441556Srgrimes goto breakloop; 24538887Stegge case CTLQUOTEMARK: 246214512Sjilles lit_quoted = 1; 24738887Stegge /* "$@" syntax adherence hack */ 24838887Stegge if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 24938887Stegge break; 25039137Stegge if ((flag & EXP_FULL) != 0) 251215783Sjilles USTPUTC(c, expdest); 25238887Stegge break; 253214512Sjilles case CTLQUOTEEND: 254214512Sjilles lit_quoted = 0; 255214512Sjilles break; 2561556Srgrimes case CTLESC: 2571556Srgrimes if (quotes) 258215783Sjilles USTPUTC(c, expdest); 2591556Srgrimes c = *p++; 260215783Sjilles USTPUTC(c, expdest); 261214512Sjilles if (split_lit && !lit_quoted) 262214512Sjilles recordregion(expdest - stackblock() - 263214512Sjilles (quotes ? 2 : 1), 264214512Sjilles expdest - stackblock(), 0); 2651556Srgrimes break; 2661556Srgrimes case CTLVAR: 2671556Srgrimes p = evalvar(p, flag); 2681556Srgrimes break; 2691556Srgrimes case CTLBACKQ: 2701556Srgrimes case CTLBACKQ|CTLQUOTE: 2711556Srgrimes expbackq(argbackq->n, c & CTLQUOTE, flag); 2721556Srgrimes argbackq = argbackq->next; 2731556Srgrimes break; 2741556Srgrimes case CTLENDARI: 2751556Srgrimes expari(flag); 2761556Srgrimes break; 2771556Srgrimes case ':': 2781556Srgrimes case '=': 2791556Srgrimes /* 2801556Srgrimes * sort of a hack - expand tildes in variable 2811556Srgrimes * assignments (after the first '=' and after ':'s). 2821556Srgrimes */ 283215783Sjilles USTPUTC(c, expdest); 284214512Sjilles if (split_lit && !lit_quoted) 285214512Sjilles recordregion(expdest - stackblock() - 1, 286214512Sjilles expdest - stackblock(), 0); 287214512Sjilles if (flag & EXP_VARTILDE && *p == '~' && 288214512Sjilles (c != '=' || firsteq)) { 289214512Sjilles if (c == '=') 290214512Sjilles firsteq = 0; 2911556Srgrimes p = exptilde(p, flag); 2921556Srgrimes } 2931556Srgrimes break; 2941556Srgrimes default: 295215783Sjilles USTPUTC(c, expdest); 296214512Sjilles if (split_lit && !lit_quoted) 297214512Sjilles recordregion(expdest - stackblock() - 1, 298214512Sjilles expdest - stackblock(), 0); 2991556Srgrimes } 3001556Srgrimes } 3011556Srgrimesbreakloop:; 3021556Srgrimes} 3031556Srgrimes 304212243Sjilles/* 305212243Sjilles * Perform tilde expansion, placing the result in the stack string and 306212243Sjilles * returning the next position in the input string to process. 307212243Sjilles */ 308213811Sobrienstatic char * 30990111Simpexptilde(char *p, int flag) 31017987Speter{ 3111556Srgrimes char c, *startp = p; 3121556Srgrimes struct passwd *pw; 3131556Srgrimes char *home; 314108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 3151556Srgrimes 31617987Speter while ((c = *p) != '\0') { 3171556Srgrimes switch(c) { 318200988Sjilles case CTLESC: /* This means CTL* are always considered quoted. */ 319200988Sjilles case CTLVAR: 320200988Sjilles case CTLBACKQ: 321200988Sjilles case CTLBACKQ | CTLQUOTE: 322200988Sjilles case CTLARI: 323200988Sjilles case CTLENDARI: 32439137Stegge case CTLQUOTEMARK: 32539137Stegge return (startp); 3261556Srgrimes case ':': 3271556Srgrimes if (flag & EXP_VARTILDE) 3281556Srgrimes goto done; 3291556Srgrimes break; 3301556Srgrimes case '/': 331206150Sjilles case CTLENDVAR: 3321556Srgrimes goto done; 3331556Srgrimes } 3341556Srgrimes p++; 3351556Srgrimes } 3361556Srgrimesdone: 3371556Srgrimes *p = '\0'; 3381556Srgrimes if (*(startp+1) == '\0') { 3391556Srgrimes if ((home = lookupvar("HOME")) == NULL) 3401556Srgrimes goto lose; 3411556Srgrimes } else { 3421556Srgrimes if ((pw = getpwnam(startp+1)) == NULL) 3431556Srgrimes goto lose; 3441556Srgrimes home = pw->pw_dir; 3451556Srgrimes } 3461556Srgrimes if (*home == '\0') 3471556Srgrimes goto lose; 3481556Srgrimes *p = c; 349216384Sjilles if (quotes) 350216384Sjilles STPUTS_QUOTES(home, SQSYNTAX, expdest); 351216384Sjilles else 352216384Sjilles STPUTS(home, expdest); 3531556Srgrimes return (p); 3541556Srgrimeslose: 3551556Srgrimes *p = c; 3561556Srgrimes return (startp); 3571556Srgrimes} 3581556Srgrimes 3591556Srgrimes 360213811Sobrienstatic void 36190111Simpremoverecordregions(int endoff) 36238887Stegge{ 36338887Stegge if (ifslastp == NULL) 36438887Stegge return; 36538887Stegge 36638887Stegge if (ifsfirst.endoff > endoff) { 36738887Stegge while (ifsfirst.next != NULL) { 36838887Stegge struct ifsregion *ifsp; 36938887Stegge INTOFF; 37038887Stegge ifsp = ifsfirst.next->next; 37138887Stegge ckfree(ifsfirst.next); 37238887Stegge ifsfirst.next = ifsp; 37338887Stegge INTON; 37438887Stegge } 37538887Stegge if (ifsfirst.begoff > endoff) 37638887Stegge ifslastp = NULL; 37738887Stegge else { 37838887Stegge ifslastp = &ifsfirst; 37938887Stegge ifsfirst.endoff = endoff; 38038887Stegge } 38138887Stegge return; 38238887Stegge } 383155301Sschweikh 38438887Stegge ifslastp = &ifsfirst; 38538887Stegge while (ifslastp->next && ifslastp->next->begoff < endoff) 38638887Stegge ifslastp=ifslastp->next; 38738887Stegge while (ifslastp->next != NULL) { 38838887Stegge struct ifsregion *ifsp; 38938887Stegge INTOFF; 39038887Stegge ifsp = ifslastp->next->next; 39138887Stegge ckfree(ifslastp->next); 39238887Stegge ifslastp->next = ifsp; 39338887Stegge INTON; 39438887Stegge } 39538887Stegge if (ifslastp->endoff > endoff) 39638887Stegge ifslastp->endoff = endoff; 39738887Stegge} 39838887Stegge 3991556Srgrimes/* 4001556Srgrimes * Expand arithmetic expression. Backup to start of expression, 4011556Srgrimes * evaluate, place result in (backed up) result, adjust string position. 4021556Srgrimes */ 4031556Srgrimesvoid 40490111Simpexpari(int flag) 40517987Speter{ 406207206Sjilles char *p, *q, *start; 407178631Sstefanf arith_t result; 40838887Stegge int begoff; 409108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 41038887Stegge int quoted; 4111556Srgrimes 4121556Srgrimes /* 41346684Skris * This routine is slightly over-complicated for 4141556Srgrimes * efficiency. First we make sure there is 4151556Srgrimes * enough space for the result, which may be bigger 416212243Sjilles * than the expression. Next we 4171556Srgrimes * scan backwards looking for the start of arithmetic. If the 4181556Srgrimes * next previous character is a CTLESC character, then we 4191556Srgrimes * have to rescan starting from the beginning since CTLESC 4208855Srgrimes * characters have to be processed left to right. 4211556Srgrimes */ 422178631Sstefanf CHECKSTRSPACE(DIGITS(result) - 2, expdest); 4238855Srgrimes USTPUTC('\0', expdest); 4241556Srgrimes start = stackblock(); 42583676Stegge p = expdest - 2; 42683676Stegge while (p >= start && *p != CTLARI) 4271556Srgrimes --p; 42883676Stegge if (p < start || *p != CTLARI) 4291556Srgrimes error("missing CTLARI (shouldn't happen)"); 43083676Stegge if (p > start && *(p - 1) == CTLESC) 4311556Srgrimes for (p = start; *p != CTLARI; p++) 4321556Srgrimes if (*p == CTLESC) 4331556Srgrimes p++; 43438887Stegge 43538887Stegge if (p[1] == '"') 43638887Stegge quoted=1; 43738887Stegge else 43838887Stegge quoted=0; 43938887Stegge begoff = p - start; 44038887Stegge removerecordregions(begoff); 4411556Srgrimes if (quotes) 44238887Stegge rmescapes(p+2); 443207206Sjilles q = grabstackstr(expdest); 44438887Stegge result = arith(p+2); 445207206Sjilles ungrabstackstr(q, expdest); 446178631Sstefanf fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 4471556Srgrimes while (*p++) 4481556Srgrimes ; 44938887Stegge if (quoted == 0) 45038887Stegge recordregion(begoff, p - 1 - start, 0); 4511556Srgrimes result = expdest - p + 1; 4521556Srgrimes STADJUST(-result, expdest); 4531556Srgrimes} 4541556Srgrimes 4551556Srgrimes 4561556Srgrimes/* 457212243Sjilles * Perform command substitution. 4581556Srgrimes */ 459213811Sobrienstatic void 46090111Simpexpbackq(union node *cmd, int quoted, int flag) 46117987Speter{ 4621556Srgrimes struct backcmd in; 4631556Srgrimes int i; 4641556Srgrimes char buf[128]; 4651556Srgrimes char *p; 4661556Srgrimes char *dest = expdest; 4671556Srgrimes struct ifsregion saveifs, *savelastp; 4681556Srgrimes struct nodelist *saveargbackq; 4691556Srgrimes char lastc; 4701556Srgrimes int startloc = dest - stackblock(); 4711556Srgrimes char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 4721556Srgrimes int saveherefd; 473108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 474115424Sfenner int nnl; 4751556Srgrimes 4761556Srgrimes INTOFF; 4771556Srgrimes saveifs = ifsfirst; 4781556Srgrimes savelastp = ifslastp; 4791556Srgrimes saveargbackq = argbackq; 4808855Srgrimes saveherefd = herefd; 4811556Srgrimes herefd = -1; 4821556Srgrimes p = grabstackstr(dest); 4831556Srgrimes evalbackcmd(cmd, &in); 4841556Srgrimes ungrabstackstr(p, dest); 4851556Srgrimes ifsfirst = saveifs; 4861556Srgrimes ifslastp = savelastp; 4871556Srgrimes argbackq = saveargbackq; 4881556Srgrimes herefd = saveherefd; 4891556Srgrimes 4901556Srgrimes p = in.buf; 4911556Srgrimes lastc = '\0'; 492115424Sfenner nnl = 0; 493115424Sfenner /* Don't copy trailing newlines */ 4941556Srgrimes for (;;) { 4951556Srgrimes if (--in.nleft < 0) { 4961556Srgrimes if (in.fd < 0) 4971556Srgrimes break; 4981556Srgrimes while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 4991556Srgrimes TRACE(("expbackq: read returns %d\n", i)); 5001556Srgrimes if (i <= 0) 5011556Srgrimes break; 5021556Srgrimes p = buf; 5031556Srgrimes in.nleft = i - 1; 5041556Srgrimes } 5051556Srgrimes lastc = *p++; 5061556Srgrimes if (lastc != '\0') { 50783675Stegge if (quotes && syntax[(int)lastc] == CCTL) 5081556Srgrimes STPUTC(CTLESC, dest); 509115424Sfenner if (lastc == '\n') { 510115424Sfenner nnl++; 511115424Sfenner } else { 512115424Sfenner while (nnl > 0) { 513115424Sfenner nnl--; 514115424Sfenner STPUTC('\n', dest); 515115424Sfenner } 516115424Sfenner STPUTC(lastc, dest); 517115424Sfenner } 5181556Srgrimes } 5191556Srgrimes } 52017987Speter 5211556Srgrimes if (in.fd >= 0) 5221556Srgrimes close(in.fd); 5231556Srgrimes if (in.buf) 5241556Srgrimes ckfree(in.buf); 5251556Srgrimes if (in.jp) 52645916Scracauer exitstatus = waitforjob(in.jp, (int *)NULL); 5271556Srgrimes if (quoted == 0) 5281556Srgrimes recordregion(startloc, dest - stackblock(), 0); 529213775Sjhb TRACE(("expbackq: size=%td: \"%.*s\"\n", 530213775Sjhb ((dest - stackblock()) - startloc), 531213775Sjhb (int)((dest - stackblock()) - startloc), 5321556Srgrimes stackblock() + startloc)); 5331556Srgrimes expdest = dest; 5341556Srgrimes INTON; 5351556Srgrimes} 5361556Srgrimes 5371556Srgrimes 5381556Srgrimes 539213811Sobrienstatic int 54090111Simpsubevalvar(char *p, char *str, int strloc, int subtype, int startloc, 541214524Sjilles int varflags, int quotes) 54217987Speter{ 54317987Speter char *startp; 54417987Speter char *loc = NULL; 54545514Stegge char *q; 54617987Speter int c = 0; 54717987Speter int saveherefd = herefd; 54817987Speter struct nodelist *saveargbackq = argbackq; 54920425Ssteve int amount; 55020425Ssteve 55117987Speter herefd = -1; 552206150Sjilles argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 553206147Sjilles subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 554206150Sjilles EXP_CASE : 0) | EXP_TILDE); 55517987Speter STACKSTRNUL(expdest); 55617987Speter herefd = saveherefd; 55717987Speter argbackq = saveargbackq; 55817987Speter startp = stackblock() + startloc; 55920425Ssteve if (str == NULL) 56020425Ssteve str = stackblock() + strloc; 56117987Speter 56217987Speter switch (subtype) { 56317987Speter case VSASSIGN: 56417987Speter setvar(str, startp, 0); 56520425Ssteve amount = startp - expdest; 56620425Ssteve STADJUST(amount, expdest); 56717987Speter varflags &= ~VSNUL; 56817987Speter if (c != 0) 56917987Speter *loc = c; 57017987Speter return 1; 57117987Speter 57217987Speter case VSQUESTION: 57317987Speter if (*p != CTLENDVAR) { 574201366Sjilles outfmt(out2, "%s\n", startp); 57517987Speter error((char *)NULL); 57617987Speter } 577112254Sru error("%.*s: parameter %snot set", (int)(p - str - 1), 57817987Speter str, (varflags & VSNUL) ? "null or " 57917987Speter : nullstr); 58017987Speter return 0; 58117987Speter 58217987Speter case VSTRIMLEFT: 58325233Ssteve for (loc = startp; loc < str; loc++) { 58417987Speter c = *loc; 58517987Speter *loc = '\0'; 586214524Sjilles if (patmatch(str, startp, quotes)) { 58717987Speter *loc = c; 58817987Speter goto recordleft; 58917987Speter } 59017987Speter *loc = c; 591214524Sjilles if (quotes && *loc == CTLESC) 59245514Stegge loc++; 59317987Speter } 59417987Speter return 0; 59517987Speter 59617987Speter case VSTRIMLEFTMAX: 59745514Stegge for (loc = str - 1; loc >= startp;) { 59817987Speter c = *loc; 59917987Speter *loc = '\0'; 600214524Sjilles if (patmatch(str, startp, quotes)) { 60117987Speter *loc = c; 60217987Speter goto recordleft; 60317987Speter } 60417987Speter *loc = c; 60545514Stegge loc--; 606214524Sjilles if (quotes && loc > startp && *(loc - 1) == CTLESC) { 60745514Stegge for (q = startp; q < loc; q++) 60845514Stegge if (*q == CTLESC) 60945514Stegge q++; 61045514Stegge if (q > loc) 61145514Stegge loc--; 61245514Stegge } 61317987Speter } 61417987Speter return 0; 61517987Speter 61617987Speter case VSTRIMRIGHT: 61745514Stegge for (loc = str - 1; loc >= startp;) { 618214524Sjilles if (patmatch(str, loc, quotes)) { 61920425Ssteve amount = loc - expdest; 62020425Ssteve STADJUST(amount, expdest); 62117987Speter return 1; 62217987Speter } 62345514Stegge loc--; 624214524Sjilles if (quotes && loc > startp && *(loc - 1) == CTLESC) { 62545514Stegge for (q = startp; q < loc; q++) 62645514Stegge if (*q == CTLESC) 62745514Stegge q++; 62845514Stegge if (q > loc) 62945514Stegge loc--; 63045514Stegge } 63117987Speter } 63217987Speter return 0; 63317987Speter 63417987Speter case VSTRIMRIGHTMAX: 63517987Speter for (loc = startp; loc < str - 1; loc++) { 636214524Sjilles if (patmatch(str, loc, quotes)) { 63720425Ssteve amount = loc - expdest; 63820425Ssteve STADJUST(amount, expdest); 63917987Speter return 1; 64017987Speter } 641214524Sjilles if (quotes && *loc == CTLESC) 64245514Stegge loc++; 64317987Speter } 64417987Speter return 0; 64517987Speter 64617987Speter 64717987Speter default: 64817987Speter abort(); 64917987Speter } 65017987Speter 65117987Speterrecordleft: 65220425Ssteve amount = ((str - 1) - (loc - startp)) - expdest; 65320425Ssteve STADJUST(amount, expdest); 65417987Speter while (loc != str - 1) 65517987Speter *startp++ = *loc++; 65617987Speter return 1; 65717987Speter} 65817987Speter 65917987Speter 6601556Srgrimes/* 6611556Srgrimes * Expand a variable, and return a pointer to the next character in the 6621556Srgrimes * input string. 6631556Srgrimes */ 6641556Srgrimes 665213811Sobrienstatic char * 66690111Simpevalvar(char *p, int flag) 66717987Speter{ 6681556Srgrimes int subtype; 6691556Srgrimes int varflags; 6701556Srgrimes char *var; 6711556Srgrimes char *val; 67245644Stegge int patloc; 6731556Srgrimes int c; 6741556Srgrimes int set; 6751556Srgrimes int special; 6761556Srgrimes int startloc; 67717987Speter int varlen; 67817987Speter int easy; 679108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 6801556Srgrimes 681164081Sstefanf varflags = (unsigned char)*p++; 6821556Srgrimes subtype = varflags & VSTYPE; 6831556Srgrimes var = p; 6841556Srgrimes special = 0; 6851556Srgrimes if (! is_name(*p)) 6861556Srgrimes special = 1; 6871556Srgrimes p = strchr(p, '=') + 1; 6881556Srgrimesagain: /* jump here after setting a variable with ${var=text} */ 689179022Sstefanf if (varflags & VSLINENO) { 690179022Sstefanf set = 1; 691179022Sstefanf special = 0; 692179022Sstefanf val = var; 693179022Sstefanf p[-1] = '\0'; /* temporarily overwrite '=' to have \0 694179022Sstefanf terminated string */ 695179022Sstefanf } else if (special) { 69625233Ssteve set = varisset(var, varflags & VSNUL); 6971556Srgrimes val = NULL; 6981556Srgrimes } else { 69960592Scracauer val = bltinlookup(var, 1); 70017987Speter if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 7011556Srgrimes val = NULL; 7021556Srgrimes set = 0; 7031556Srgrimes } else 7041556Srgrimes set = 1; 7051556Srgrimes } 70617987Speter varlen = 0; 7071556Srgrimes startloc = expdest - stackblock(); 708198454Sjilles if (!set && uflag && *var != '@' && *var != '*') { 70996939Stjr switch (subtype) { 71096939Stjr case VSNORMAL: 71196939Stjr case VSTRIMLEFT: 71296939Stjr case VSTRIMLEFTMAX: 71396939Stjr case VSTRIMRIGHT: 71496939Stjr case VSTRIMRIGHTMAX: 71596939Stjr case VSLENGTH: 716112254Sru error("%.*s: parameter not set", (int)(p - var - 1), 717112254Sru var); 71896939Stjr } 71996939Stjr } 7201556Srgrimes if (set && subtype != VSPLUS) { 7211556Srgrimes /* insert the value of the variable */ 7221556Srgrimes if (special) { 723164081Sstefanf varvalue(var, varflags & VSQUOTE, subtype, flag); 72417987Speter if (subtype == VSLENGTH) { 72525233Ssteve varlen = expdest - stackblock() - startloc; 72625233Ssteve STADJUST(-varlen, expdest); 72717987Speter } 7281556Srgrimes } else { 72920425Ssteve char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 73017987Speter : BASESYNTAX; 7311556Srgrimes 73217987Speter if (subtype == VSLENGTH) { 73317987Speter for (;*val; val++) 73417987Speter varlen++; 7351556Srgrimes } 73617987Speter else { 737216384Sjilles if (quotes) 738216384Sjilles STPUTS_QUOTES(val, syntax, expdest); 739216384Sjilles else 740216384Sjilles STPUTS(val, expdest); 74117987Speter 74217987Speter } 7431556Srgrimes } 7441556Srgrimes } 74520425Ssteve 7461556Srgrimes if (subtype == VSPLUS) 7471556Srgrimes set = ! set; 74817987Speter 74920425Ssteve easy = ((varflags & VSQUOTE) == 0 || 75017987Speter (*var == '@' && shellparam.nparam != 1)); 75117987Speter 75217987Speter 75317987Speter switch (subtype) { 75417987Speter case VSLENGTH: 75517987Speter expdest = cvtnum(varlen, expdest); 75617987Speter goto record; 75717987Speter 75817987Speter case VSNORMAL: 75917987Speter if (!easy) 76017987Speter break; 76117987Speterrecord: 76220425Ssteve recordregion(startloc, expdest - stackblock(), 76317987Speter varflags & VSQUOTE); 76417987Speter break; 76517987Speter 76617987Speter case VSPLUS: 76717987Speter case VSMINUS: 76817987Speter if (!set) { 769214512Sjilles argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | 770214512Sjilles (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); 77117987Speter break; 77217987Speter } 77317987Speter if (easy) 77417987Speter goto record; 77517987Speter break; 77617987Speter 77717987Speter case VSTRIMLEFT: 77817987Speter case VSTRIMLEFTMAX: 77917987Speter case VSTRIMRIGHT: 78017987Speter case VSTRIMRIGHTMAX: 78117987Speter if (!set) 78217987Speter break; 78317987Speter /* 78417987Speter * Terminate the string and start recording the pattern 78517987Speter * right after it 78617987Speter */ 78717987Speter STPUTC('\0', expdest); 78845644Stegge patloc = expdest - stackblock(); 78945644Stegge if (subevalvar(p, NULL, patloc, subtype, 790214524Sjilles startloc, varflags, quotes) == 0) { 79145644Stegge int amount = (expdest - stackblock() - patloc) + 1; 79225233Ssteve STADJUST(-amount, expdest); 79325233Ssteve } 79438887Stegge /* Remove any recorded regions beyond start of variable */ 79538887Stegge removerecordregions(startloc); 79638887Stegge goto record; 79717987Speter 79817987Speter case VSASSIGN: 79917987Speter case VSQUESTION: 80017987Speter if (!set) { 801214524Sjilles if (subevalvar(p, var, 0, subtype, startloc, varflags, 802214524Sjilles quotes)) { 80320425Ssteve varflags &= ~VSNUL; 804155301Sschweikh /* 805155301Sschweikh * Remove any recorded regions beyond 806155301Sschweikh * start of variable 80738887Stegge */ 80838887Stegge removerecordregions(startloc); 8091556Srgrimes goto again; 81020425Ssteve } 81117987Speter break; 8121556Srgrimes } 81317987Speter if (easy) 81417987Speter goto record; 81517987Speter break; 81617987Speter 817164003Sstefanf case VSERROR: 818164003Sstefanf c = p - var - 1; 819164003Sstefanf error("${%.*s%s}: Bad substitution", c, var, 820164003Sstefanf (c > 0 && *p != CTLENDVAR) ? "..." : ""); 821164003Sstefanf 82217987Speter default: 82317987Speter abort(); 8241556Srgrimes } 825179022Sstefanf p[-1] = '='; /* recover overwritten '=' */ 82617987Speter 8271556Srgrimes if (subtype != VSNORMAL) { /* skip to end of alternative */ 8281556Srgrimes int nesting = 1; 8291556Srgrimes for (;;) { 8301556Srgrimes if ((c = *p++) == CTLESC) 8311556Srgrimes p++; 8321556Srgrimes else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 8331556Srgrimes if (set) 8341556Srgrimes argbackq = argbackq->next; 8351556Srgrimes } else if (c == CTLVAR) { 8361556Srgrimes if ((*p++ & VSTYPE) != VSNORMAL) 8371556Srgrimes nesting++; 8381556Srgrimes } else if (c == CTLENDVAR) { 8391556Srgrimes if (--nesting == 0) 8401556Srgrimes break; 8411556Srgrimes } 8421556Srgrimes } 8431556Srgrimes } 8441556Srgrimes return p; 8451556Srgrimes} 8461556Srgrimes 8471556Srgrimes 8481556Srgrimes 8491556Srgrimes/* 8501556Srgrimes * Test whether a specialized variable is set. 8511556Srgrimes */ 8521556Srgrimes 853213811Sobrienstatic int 85490111Simpvarisset(char *name, int nulok) 85525233Ssteve{ 8561556Srgrimes 85725233Ssteve if (*name == '!') 858209600Sjilles return backgndpidset(); 85925233Ssteve else if (*name == '@' || *name == '*') { 8601556Srgrimes if (*shellparam.p == NULL) 8611556Srgrimes return 0; 86225233Ssteve 86325233Ssteve if (nulok) { 86425233Ssteve char **av; 86525233Ssteve 86625233Ssteve for (av = shellparam.p; *av; av++) 86725233Ssteve if (**av != '\0') 86825233Ssteve return 1; 86925233Ssteve return 0; 87025233Ssteve } 87118202Speter } else if (is_digit(*name)) { 87225233Ssteve char *ap; 87320425Ssteve int num = atoi(name); 87425233Ssteve 87525233Ssteve if (num > shellparam.nparam) 87625233Ssteve return 0; 87725233Ssteve 87825233Ssteve if (num == 0) 87925233Ssteve ap = arg0; 88025233Ssteve else 88125233Ssteve ap = shellparam.p[num - 1]; 88225233Ssteve 88325233Ssteve if (nulok && (ap == NULL || *ap == '\0')) 88425233Ssteve return 0; 8851556Srgrimes } 8861556Srgrimes return 1; 8871556Srgrimes} 8881556Srgrimes 889216384Sjillesstatic void 890216384Sjillesstrtodest(const char *p, int flag, int subtype, int quoted) 891216384Sjilles{ 892216384Sjilles if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) 893216384Sjilles STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); 894216384Sjilles else 895216384Sjilles STPUTS(p, expdest); 896216384Sjilles} 8971556Srgrimes 8981556Srgrimes/* 8991556Srgrimes * Add the value of a specialized variable to the stack string. 9001556Srgrimes */ 9011556Srgrimes 902213811Sobrienstatic void 903164081Sstefanfvarvalue(char *name, int quoted, int subtype, int flag) 90417987Speter{ 9051556Srgrimes int num; 9061556Srgrimes char *p; 9071556Srgrimes int i; 9081556Srgrimes char sep; 9091556Srgrimes char **ap; 9101556Srgrimes 91118202Speter switch (*name) { 9121556Srgrimes case '$': 9131556Srgrimes num = rootpid; 9141556Srgrimes goto numvar; 9151556Srgrimes case '?': 91617987Speter num = oexitstatus; 9171556Srgrimes goto numvar; 9181556Srgrimes case '#': 9191556Srgrimes num = shellparam.nparam; 9201556Srgrimes goto numvar; 9211556Srgrimes case '!': 922209600Sjilles num = backgndpidval(); 9231556Srgrimesnumvar: 92417987Speter expdest = cvtnum(num, expdest); 9251556Srgrimes break; 9261556Srgrimes case '-': 9271556Srgrimes for (i = 0 ; i < NOPTS ; i++) { 9281556Srgrimes if (optlist[i].val) 9291556Srgrimes STPUTC(optlist[i].letter, expdest); 9301556Srgrimes } 9311556Srgrimes break; 9321556Srgrimes case '@': 933164081Sstefanf if (flag & EXP_FULL && quoted) { 93438887Stegge for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 935216384Sjilles strtodest(p, flag, subtype, quoted); 93638887Stegge if (*ap) 93738887Stegge STPUTC('\0', expdest); 93838887Stegge } 93938887Stegge break; 9401556Srgrimes } 941102410Scharnier /* FALLTHROUGH */ 9421556Srgrimes case '*': 943149825Srse if (ifsset()) 94438887Stegge sep = ifsval()[0]; 94538887Stegge else 94638887Stegge sep = ' '; 9471556Srgrimes for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 948216384Sjilles strtodest(p, flag, subtype, quoted); 94938887Stegge if (*ap && sep) 9501556Srgrimes STPUTC(sep, expdest); 9511556Srgrimes } 9521556Srgrimes break; 9531556Srgrimes case '0': 9541556Srgrimes p = arg0; 955216384Sjilles strtodest(p, flag, subtype, quoted); 9561556Srgrimes break; 9571556Srgrimes default: 95818202Speter if (is_digit(*name)) { 95918202Speter num = atoi(name); 96018202Speter if (num > 0 && num <= shellparam.nparam) { 96118202Speter p = shellparam.p[num - 1]; 962216384Sjilles strtodest(p, flag, subtype, quoted); 96318202Speter } 9641556Srgrimes } 9651556Srgrimes break; 9661556Srgrimes } 9671556Srgrimes} 9681556Srgrimes 9691556Srgrimes 9701556Srgrimes 9711556Srgrimes/* 9721556Srgrimes * Record the the fact that we have to scan this region of the 9731556Srgrimes * string for IFS characters. 9741556Srgrimes */ 9751556Srgrimes 976213811Sobrienstatic void 977194975Sjillesrecordregion(int start, int end, int inquotes) 97817987Speter{ 97925233Ssteve struct ifsregion *ifsp; 9801556Srgrimes 9811556Srgrimes if (ifslastp == NULL) { 9821556Srgrimes ifsp = &ifsfirst; 9831556Srgrimes } else { 984194975Sjilles if (ifslastp->endoff == start 985194975Sjilles && ifslastp->inquotes == inquotes) { 986194975Sjilles /* extend previous area */ 987194975Sjilles ifslastp->endoff = end; 988194975Sjilles return; 989194975Sjilles } 9901556Srgrimes ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 9911556Srgrimes ifslastp->next = ifsp; 9921556Srgrimes } 9931556Srgrimes ifslastp = ifsp; 9941556Srgrimes ifslastp->next = NULL; 9951556Srgrimes ifslastp->begoff = start; 9961556Srgrimes ifslastp->endoff = end; 997194975Sjilles ifslastp->inquotes = inquotes; 9981556Srgrimes} 9991556Srgrimes 10001556Srgrimes 10011556Srgrimes 10021556Srgrimes/* 10031556Srgrimes * Break the argument string into pieces based upon IFS and add the 10041556Srgrimes * strings to the argument list. The regions of the string to be 10051556Srgrimes * searched for IFS characters have been stored by recordregion. 1006212243Sjilles * CTLESC characters are preserved but have little effect in this pass 1007212243Sjilles * other than escaping CTL* characters. In particular, they do not escape 1008212243Sjilles * IFS characters: that should be done with the ifsregion mechanism. 1009212243Sjilles * CTLQUOTEMARK characters are used to preserve empty quoted strings. 1010212243Sjilles * This pass treats them as a regular character, making the string non-empty. 1011212243Sjilles * Later, they are removed along with the other CTL* characters. 10121556Srgrimes */ 1013213811Sobrienstatic void 101490111Simpifsbreakup(char *string, struct arglist *arglist) 101590111Simp{ 10161556Srgrimes struct ifsregion *ifsp; 10171556Srgrimes struct strlist *sp; 10181556Srgrimes char *start; 101925233Ssteve char *p; 10201556Srgrimes char *q; 1021201053Sjilles const char *ifs; 1022194975Sjilles const char *ifsspc; 1023194975Sjilles int had_param_ch = 0; 10241556Srgrimes 1025194975Sjilles start = string; 102617987Speter 1027194975Sjilles if (ifslastp == NULL) { 1028194975Sjilles /* Return entire argument, IFS doesn't apply to any of it */ 1029194975Sjilles sp = (struct strlist *)stalloc(sizeof *sp); 1030194975Sjilles sp->text = start; 1031194975Sjilles *arglist->lastp = sp; 1032194975Sjilles arglist->lastp = &sp->next; 1033194975Sjilles return; 1034194975Sjilles } 1035194975Sjilles 1036194975Sjilles ifs = ifsset() ? ifsval() : " \t\n"; 1037194975Sjilles 1038194975Sjilles for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1039194975Sjilles p = string + ifsp->begoff; 1040194975Sjilles while (p < string + ifsp->endoff) { 1041194975Sjilles q = p; 1042194975Sjilles if (*p == CTLESC) 1043194975Sjilles p++; 1044194975Sjilles if (ifsp->inquotes) { 1045194975Sjilles /* Only NULs (should be from "$@") end args */ 1046194977Sjilles had_param_ch = 1; 1047194975Sjilles if (*p != 0) { 10481556Srgrimes p++; 1049194975Sjilles continue; 1050194975Sjilles } 1051194975Sjilles ifsspc = NULL; 1052194975Sjilles } else { 1053194975Sjilles if (!strchr(ifs, *p)) { 1054194977Sjilles had_param_ch = 1; 105538887Stegge p++; 1056194975Sjilles continue; 1057194975Sjilles } 1058194975Sjilles ifsspc = strchr(" \t\n", *p); 1059194975Sjilles 1060194975Sjilles /* Ignore IFS whitespace at start */ 1061194975Sjilles if (q == start && ifsspc != NULL) { 1062194975Sjilles p++; 10631556Srgrimes start = p; 1064194975Sjilles continue; 1065194975Sjilles } 1066194977Sjilles had_param_ch = 0; 10671556Srgrimes } 1068194975Sjilles 1069194975Sjilles /* Save this argument... */ 1070194975Sjilles *q = '\0'; 10711556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10721556Srgrimes sp->text = start; 10731556Srgrimes *arglist->lastp = sp; 10741556Srgrimes arglist->lastp = &sp->next; 1075194975Sjilles p++; 1076194975Sjilles 1077194975Sjilles if (ifsspc != NULL) { 1078194975Sjilles /* Ignore further trailing IFS whitespace */ 1079194975Sjilles for (; p < string + ifsp->endoff; p++) { 1080194975Sjilles q = p; 1081194975Sjilles if (*p == CTLESC) 1082194975Sjilles p++; 1083194975Sjilles if (strchr(ifs, *p) == NULL) { 1084194975Sjilles p = q; 1085194975Sjilles break; 1086194975Sjilles } 1087194975Sjilles if (strchr(" \t\n", *p) == NULL) { 1088194975Sjilles p++; 1089194975Sjilles break; 1090194975Sjilles } 1091194975Sjilles } 1092194975Sjilles } 1093194975Sjilles start = p; 10941556Srgrimes } 1095194975Sjilles } 1096194975Sjilles 1097194975Sjilles /* 1098194975Sjilles * Save anything left as an argument. 1099194975Sjilles * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1100194975Sjilles * generating 2 arguments, the second of which is empty. 1101194975Sjilles * Some recent clarification of the Posix spec say that it 1102194975Sjilles * should only generate one.... 1103194975Sjilles */ 1104194975Sjilles if (had_param_ch || *start != 0) { 11051556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 11061556Srgrimes sp->text = start; 11071556Srgrimes *arglist->lastp = sp; 11081556Srgrimes arglist->lastp = &sp->next; 11091556Srgrimes } 11101556Srgrimes} 11111556Srgrimes 11121556Srgrimes 1113213760Sobrienstatic char expdir[PATH_MAX]; 1114212243Sjilles#define expdir_end (expdir + sizeof(expdir)) 11151556Srgrimes 11161556Srgrimes/* 1117212243Sjilles * Perform pathname generation and remove control characters. 1118212243Sjilles * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1119212243Sjilles * The results are stored in the list exparg. 11201556Srgrimes */ 1121213811Sobrienstatic void 112290111Simpexpandmeta(struct strlist *str, int flag __unused) 112317987Speter{ 11241556Srgrimes char *p; 11251556Srgrimes struct strlist **savelastp; 11261556Srgrimes struct strlist *sp; 11271556Srgrimes char c; 11281556Srgrimes /* TODO - EXP_REDIR */ 11291556Srgrimes 11301556Srgrimes while (str) { 11311556Srgrimes if (fflag) 11321556Srgrimes goto nometa; 11331556Srgrimes p = str->text; 11341556Srgrimes for (;;) { /* fast check for meta chars */ 11351556Srgrimes if ((c = *p++) == '\0') 11361556Srgrimes goto nometa; 1137211646Sjilles if (c == '*' || c == '?' || c == '[') 11381556Srgrimes break; 11391556Srgrimes } 11401556Srgrimes savelastp = exparg.lastp; 11411556Srgrimes INTOFF; 11421556Srgrimes expmeta(expdir, str->text); 11431556Srgrimes INTON; 11441556Srgrimes if (exparg.lastp == savelastp) { 11458855Srgrimes /* 11468855Srgrimes * no matches 11471556Srgrimes */ 11481556Srgrimesnometa: 11491556Srgrimes *exparg.lastp = str; 11501556Srgrimes rmescapes(str->text); 11511556Srgrimes exparg.lastp = &str->next; 11521556Srgrimes } else { 11531556Srgrimes *exparg.lastp = NULL; 11541556Srgrimes *savelastp = sp = expsort(*savelastp); 11551556Srgrimes while (sp->next != NULL) 11561556Srgrimes sp = sp->next; 11571556Srgrimes exparg.lastp = &sp->next; 11581556Srgrimes } 11591556Srgrimes str = str->next; 11601556Srgrimes } 11611556Srgrimes} 11621556Srgrimes 11631556Srgrimes 11641556Srgrimes/* 11651556Srgrimes * Do metacharacter (i.e. *, ?, [...]) expansion. 11661556Srgrimes */ 11671556Srgrimes 1168213811Sobrienstatic void 116990111Simpexpmeta(char *enddir, char *name) 117090111Simp{ 117125233Ssteve char *p; 11721556Srgrimes char *q; 11731556Srgrimes char *start; 11741556Srgrimes char *endname; 11751556Srgrimes int metaflag; 11761556Srgrimes struct stat statb; 11771556Srgrimes DIR *dirp; 11781556Srgrimes struct dirent *dp; 11791556Srgrimes int atend; 11801556Srgrimes int matchdot; 1181207944Sjilles int esc; 11821556Srgrimes 11831556Srgrimes metaflag = 0; 11841556Srgrimes start = name; 1185207944Sjilles for (p = name; esc = 0, *p; p += esc + 1) { 11861556Srgrimes if (*p == '*' || *p == '?') 11871556Srgrimes metaflag = 1; 11881556Srgrimes else if (*p == '[') { 11891556Srgrimes q = p + 1; 119026488Sache if (*q == '!' || *q == '^') 11911556Srgrimes q++; 11921556Srgrimes for (;;) { 119338887Stegge while (*q == CTLQUOTEMARK) 119438887Stegge q++; 11951556Srgrimes if (*q == CTLESC) 11961556Srgrimes q++; 11971556Srgrimes if (*q == '/' || *q == '\0') 11981556Srgrimes break; 11991556Srgrimes if (*++q == ']') { 12001556Srgrimes metaflag = 1; 12011556Srgrimes break; 12021556Srgrimes } 12031556Srgrimes } 12041556Srgrimes } else if (*p == '\0') 12051556Srgrimes break; 120638887Stegge else if (*p == CTLQUOTEMARK) 120738887Stegge continue; 1208207944Sjilles else { 1209207944Sjilles if (*p == CTLESC) 1210207944Sjilles esc++; 1211207944Sjilles if (p[esc] == '/') { 1212207944Sjilles if (metaflag) 1213207944Sjilles break; 1214207944Sjilles start = p + esc + 1; 1215207944Sjilles } 12161556Srgrimes } 12171556Srgrimes } 12181556Srgrimes if (metaflag == 0) { /* we've reached the end of the file name */ 12191556Srgrimes if (enddir != expdir) 12201556Srgrimes metaflag++; 12211556Srgrimes for (p = name ; ; p++) { 122238887Stegge if (*p == CTLQUOTEMARK) 122338887Stegge continue; 12241556Srgrimes if (*p == CTLESC) 12251556Srgrimes p++; 12261556Srgrimes *enddir++ = *p; 12271556Srgrimes if (*p == '\0') 12281556Srgrimes break; 1229211155Sjilles if (enddir == expdir_end) 1230211155Sjilles return; 12311556Srgrimes } 1232147812Sdelphij if (metaflag == 0 || lstat(expdir, &statb) >= 0) 12331556Srgrimes addfname(expdir); 12341556Srgrimes return; 12351556Srgrimes } 12361556Srgrimes endname = p; 12371556Srgrimes if (start != name) { 12381556Srgrimes p = name; 12391556Srgrimes while (p < start) { 124038887Stegge while (*p == CTLQUOTEMARK) 124138887Stegge p++; 12421556Srgrimes if (*p == CTLESC) 12431556Srgrimes p++; 12441556Srgrimes *enddir++ = *p++; 1245211155Sjilles if (enddir == expdir_end) 1246211155Sjilles return; 12471556Srgrimes } 12481556Srgrimes } 12491556Srgrimes if (enddir == expdir) { 12501556Srgrimes p = "."; 12511556Srgrimes } else if (enddir == expdir + 1 && *expdir == '/') { 12521556Srgrimes p = "/"; 12531556Srgrimes } else { 12541556Srgrimes p = expdir; 12551556Srgrimes enddir[-1] = '\0'; 12561556Srgrimes } 12571556Srgrimes if ((dirp = opendir(p)) == NULL) 12581556Srgrimes return; 12591556Srgrimes if (enddir != expdir) 12601556Srgrimes enddir[-1] = '/'; 12611556Srgrimes if (*endname == 0) { 12621556Srgrimes atend = 1; 12631556Srgrimes } else { 12641556Srgrimes atend = 0; 1265207944Sjilles *endname = '\0'; 1266207944Sjilles endname += esc + 1; 12671556Srgrimes } 12681556Srgrimes matchdot = 0; 126938887Stegge p = start; 127038887Stegge while (*p == CTLQUOTEMARK) 127138887Stegge p++; 127238887Stegge if (*p == CTLESC) 127338887Stegge p++; 127438887Stegge if (*p == '.') 12751556Srgrimes matchdot++; 12761556Srgrimes while (! int_pending() && (dp = readdir(dirp)) != NULL) { 12771556Srgrimes if (dp->d_name[0] == '.' && ! matchdot) 12781556Srgrimes continue; 127945514Stegge if (patmatch(start, dp->d_name, 0)) { 1280211155Sjilles if (enddir + dp->d_namlen + 1 > expdir_end) 1281211155Sjilles continue; 1282211155Sjilles memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1283211155Sjilles if (atend) 12841556Srgrimes addfname(expdir); 1285211155Sjilles else { 1286211155Sjilles if (enddir + dp->d_namlen + 2 > expdir_end) 128717987Speter continue; 1288211155Sjilles enddir[dp->d_namlen] = '/'; 1289211155Sjilles enddir[dp->d_namlen + 1] = '\0'; 1290211155Sjilles expmeta(enddir + dp->d_namlen + 1, endname); 12911556Srgrimes } 12921556Srgrimes } 12931556Srgrimes } 12941556Srgrimes closedir(dirp); 12951556Srgrimes if (! atend) 1296207944Sjilles endname[-esc - 1] = esc ? CTLESC : '/'; 12971556Srgrimes} 12981556Srgrimes 12991556Srgrimes 13001556Srgrimes/* 13011556Srgrimes * Add a file name to the list. 13021556Srgrimes */ 13031556Srgrimes 1304213811Sobrienstatic void 130590111Simpaddfname(char *name) 130690111Simp{ 13071556Srgrimes char *p; 13081556Srgrimes struct strlist *sp; 13091556Srgrimes 13101556Srgrimes p = stalloc(strlen(name) + 1); 13111556Srgrimes scopy(name, p); 13121556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 13131556Srgrimes sp->text = p; 13141556Srgrimes *exparg.lastp = sp; 13151556Srgrimes exparg.lastp = &sp->next; 13161556Srgrimes} 13171556Srgrimes 13181556Srgrimes 13191556Srgrimes/* 13201556Srgrimes * Sort the results of file name expansion. It calculates the number of 13211556Srgrimes * strings to sort and then calls msort (short for merge sort) to do the 13221556Srgrimes * work. 13231556Srgrimes */ 13241556Srgrimes 1325213811Sobrienstatic struct strlist * 132690111Simpexpsort(struct strlist *str) 132790111Simp{ 13281556Srgrimes int len; 13291556Srgrimes struct strlist *sp; 13301556Srgrimes 13311556Srgrimes len = 0; 13321556Srgrimes for (sp = str ; sp ; sp = sp->next) 13331556Srgrimes len++; 13341556Srgrimes return msort(str, len); 13351556Srgrimes} 13361556Srgrimes 13371556Srgrimes 1338213811Sobrienstatic struct strlist * 133990111Simpmsort(struct strlist *list, int len) 134017987Speter{ 134117987Speter struct strlist *p, *q = NULL; 13421556Srgrimes struct strlist **lpp; 13431556Srgrimes int half; 13441556Srgrimes int n; 13451556Srgrimes 13461556Srgrimes if (len <= 1) 13471556Srgrimes return list; 13488855Srgrimes half = len >> 1; 13491556Srgrimes p = list; 13501556Srgrimes for (n = half ; --n >= 0 ; ) { 13511556Srgrimes q = p; 13521556Srgrimes p = p->next; 13531556Srgrimes } 13541556Srgrimes q->next = NULL; /* terminate first half of list */ 13551556Srgrimes q = msort(list, half); /* sort first half of list */ 13561556Srgrimes p = msort(p, len - half); /* sort second half */ 13571556Srgrimes lpp = &list; 13581556Srgrimes for (;;) { 13591556Srgrimes if (strcmp(p->text, q->text) < 0) { 13601556Srgrimes *lpp = p; 13611556Srgrimes lpp = &p->next; 13621556Srgrimes if ((p = *lpp) == NULL) { 13631556Srgrimes *lpp = q; 13641556Srgrimes break; 13651556Srgrimes } 13661556Srgrimes } else { 13671556Srgrimes *lpp = q; 13681556Srgrimes lpp = &q->next; 13691556Srgrimes if ((q = *lpp) == NULL) { 13701556Srgrimes *lpp = p; 13711556Srgrimes break; 13721556Srgrimes } 13731556Srgrimes } 13741556Srgrimes } 13751556Srgrimes return list; 13761556Srgrimes} 13771556Srgrimes 13781556Srgrimes 13791556Srgrimes 13801556Srgrimes/* 13811556Srgrimes * Returns true if the pattern matches the string. 13821556Srgrimes */ 13831556Srgrimes 13841556Srgrimesint 1385200956Sjillespatmatch(const char *pattern, const char *string, int squoted) 138690111Simp{ 1387200956Sjilles const char *p, *q; 138825233Ssteve char c; 13891556Srgrimes 13901556Srgrimes p = pattern; 13911556Srgrimes q = string; 13921556Srgrimes for (;;) { 13931556Srgrimes switch (c = *p++) { 13941556Srgrimes case '\0': 13951556Srgrimes goto breakloop; 13961556Srgrimes case CTLESC: 139745514Stegge if (squoted && *q == CTLESC) 139845514Stegge q++; 13991556Srgrimes if (*q++ != *p++) 14001556Srgrimes return 0; 14011556Srgrimes break; 140238887Stegge case CTLQUOTEMARK: 140338887Stegge continue; 14041556Srgrimes case '?': 140545514Stegge if (squoted && *q == CTLESC) 140645514Stegge q++; 14071556Srgrimes if (*q++ == '\0') 14081556Srgrimes return 0; 14091556Srgrimes break; 14101556Srgrimes case '*': 14111556Srgrimes c = *p; 141238887Stegge while (c == CTLQUOTEMARK || c == '*') 141338887Stegge c = *++p; 141438887Stegge if (c != CTLESC && c != CTLQUOTEMARK && 141538887Stegge c != '?' && c != '*' && c != '[') { 14161556Srgrimes while (*q != c) { 141745514Stegge if (squoted && *q == CTLESC && 141845514Stegge q[1] == c) 141945514Stegge break; 14201556Srgrimes if (*q == '\0') 14211556Srgrimes return 0; 142245514Stegge if (squoted && *q == CTLESC) 142345514Stegge q++; 14241556Srgrimes q++; 14251556Srgrimes } 14261556Srgrimes } 14271556Srgrimes do { 1428211646Sjilles if (patmatch(p, q, squoted)) 14291556Srgrimes return 1; 143045514Stegge if (squoted && *q == CTLESC) 143145514Stegge q++; 14321556Srgrimes } while (*q++ != '\0'); 14331556Srgrimes return 0; 14341556Srgrimes case '[': { 1435200956Sjilles const char *endp; 14361556Srgrimes int invert, found; 14371556Srgrimes char chr; 14381556Srgrimes 14391556Srgrimes endp = p; 144026488Sache if (*endp == '!' || *endp == '^') 14411556Srgrimes endp++; 14421556Srgrimes for (;;) { 144338887Stegge while (*endp == CTLQUOTEMARK) 144438887Stegge endp++; 14451556Srgrimes if (*endp == '\0') 14461556Srgrimes goto dft; /* no matching ] */ 14471556Srgrimes if (*endp == CTLESC) 14481556Srgrimes endp++; 14491556Srgrimes if (*++endp == ']') 14501556Srgrimes break; 14511556Srgrimes } 14521556Srgrimes invert = 0; 145326488Sache if (*p == '!' || *p == '^') { 14541556Srgrimes invert++; 14551556Srgrimes p++; 14561556Srgrimes } 14571556Srgrimes found = 0; 14581556Srgrimes chr = *q++; 145945514Stegge if (squoted && chr == CTLESC) 146045514Stegge chr = *q++; 146117987Speter if (chr == '\0') 146217987Speter return 0; 14631556Srgrimes c = *p++; 14641556Srgrimes do { 146538887Stegge if (c == CTLQUOTEMARK) 146638887Stegge continue; 14671556Srgrimes if (c == CTLESC) 14681556Srgrimes c = *p++; 14691556Srgrimes if (*p == '-' && p[1] != ']') { 14701556Srgrimes p++; 147138887Stegge while (*p == CTLQUOTEMARK) 147238887Stegge p++; 14731556Srgrimes if (*p == CTLESC) 14741556Srgrimes p++; 147517557Sache if ( collate_range_cmp(chr, c) >= 0 147617557Sache && collate_range_cmp(chr, *p) <= 0 147717525Sache ) 14781556Srgrimes found = 1; 14791556Srgrimes p++; 14801556Srgrimes } else { 14811556Srgrimes if (chr == c) 14821556Srgrimes found = 1; 14831556Srgrimes } 14841556Srgrimes } while ((c = *p++) != ']'); 14851556Srgrimes if (found == invert) 14861556Srgrimes return 0; 14871556Srgrimes break; 14881556Srgrimes } 14891556Srgrimesdft: default: 149045514Stegge if (squoted && *q == CTLESC) 149145514Stegge q++; 14921556Srgrimes if (*q++ != c) 14931556Srgrimes return 0; 14941556Srgrimes break; 14951556Srgrimes } 14961556Srgrimes } 14971556Srgrimesbreakloop: 14981556Srgrimes if (*q != '\0') 14991556Srgrimes return 0; 15001556Srgrimes return 1; 15011556Srgrimes} 15021556Srgrimes 15031556Srgrimes 15041556Srgrimes 15051556Srgrimes/* 1506212243Sjilles * Remove any CTLESC and CTLQUOTEMARK characters from a string. 15071556Srgrimes */ 15081556Srgrimes 15091556Srgrimesvoid 151090111Simprmescapes(char *str) 151138887Stegge{ 151225233Ssteve char *p, *q; 15131556Srgrimes 15141556Srgrimes p = str; 1515214512Sjilles while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { 15161556Srgrimes if (*p++ == '\0') 15171556Srgrimes return; 15181556Srgrimes } 15191556Srgrimes q = p; 15201556Srgrimes while (*p) { 1521214512Sjilles if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { 152238887Stegge p++; 152338887Stegge continue; 152438887Stegge } 15251556Srgrimes if (*p == CTLESC) 15261556Srgrimes p++; 15271556Srgrimes *q++ = *p++; 15281556Srgrimes } 15291556Srgrimes *q = '\0'; 15301556Srgrimes} 15311556Srgrimes 15321556Srgrimes 15331556Srgrimes 15341556Srgrimes/* 15351556Srgrimes * See if a pattern matches in a case statement. 15361556Srgrimes */ 15371556Srgrimes 15381556Srgrimesint 1539200956Sjillescasematch(union node *pattern, const char *val) 154090111Simp{ 15411556Srgrimes struct stackmark smark; 15421556Srgrimes int result; 15431556Srgrimes char *p; 15441556Srgrimes 15451556Srgrimes setstackmark(&smark); 15461556Srgrimes argbackq = pattern->narg.backquote; 15471556Srgrimes STARTSTACKSTR(expdest); 15481556Srgrimes ifslastp = NULL; 15491556Srgrimes argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 15501556Srgrimes STPUTC('\0', expdest); 15511556Srgrimes p = grabstackstr(expdest); 155245514Stegge result = patmatch(p, val, 0); 15531556Srgrimes popstackmark(&smark); 15541556Srgrimes return result; 15551556Srgrimes} 155617987Speter 155717987Speter/* 155817987Speter * Our own itoa(). 155917987Speter */ 156017987Speter 1561213811Sobrienstatic char * 156290111Simpcvtnum(int num, char *buf) 156390111Simp{ 156417987Speter char temp[32]; 156517987Speter int neg = num < 0; 156617987Speter char *p = temp + 31; 156717987Speter 156817987Speter temp[31] = '\0'; 156917987Speter 157017987Speter do { 157117987Speter *--p = num % 10 + '0'; 157217987Speter } while ((num /= 10) != 0); 157317987Speter 157417987Speter if (neg) 157517987Speter *--p = '-'; 157617987Speter 1577215783Sjilles STPUTS(p, buf); 157817987Speter return buf; 157917987Speter} 1580108286Stjr 1581108286Stjr/* 1582108286Stjr * Do most of the work for wordexp(3). 1583108286Stjr */ 1584108286Stjr 1585108286Stjrint 1586108286Stjrwordexpcmd(int argc, char **argv) 1587108286Stjr{ 1588108286Stjr size_t len; 1589108286Stjr int i; 1590108286Stjr 1591108286Stjr out1fmt("%08x", argc - 1); 1592108286Stjr for (i = 1, len = 0; i < argc; i++) 1593108286Stjr len += strlen(argv[i]); 1594108286Stjr out1fmt("%08x", (int)len); 1595215567Sjilles for (i = 1; i < argc; i++) 1596215567Sjilles outbin(argv[i], strlen(argv[i]) + 1, out1); 1597108286Stjr return (0); 1598108286Stjr} 1599