expand.c revision 213775
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 213775 2010-10-13 13:22:11Z jhb $"); 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 9890111SimpSTATIC void argstr(char *, int); 9990111SimpSTATIC char *exptilde(char *, int); 10090111SimpSTATIC void expbackq(union node *, int, int); 10190111SimpSTATIC int subevalvar(char *, char *, int, int, int, int); 10290111SimpSTATIC char *evalvar(char *, int); 10390111SimpSTATIC int varisset(char *, int); 104164081SstefanfSTATIC void varvalue(char *, int, int, int); 10590111SimpSTATIC void recordregion(int, int, int); 106155301SschweikhSTATIC void removerecordregions(int); 10790111SimpSTATIC void ifsbreakup(char *, struct arglist *); 10890111SimpSTATIC void expandmeta(struct strlist *, int); 10990111SimpSTATIC void expmeta(char *, char *); 11090111SimpSTATIC void addfname(char *); 11190111SimpSTATIC struct strlist *expsort(struct strlist *); 11290111SimpSTATIC struct strlist *msort(struct strlist *, int); 11390111SimpSTATIC char *cvtnum(int, char *); 11490111SimpSTATIC int collate_range_cmp(int, int); 1151556Srgrimes 11690111SimpSTATIC 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 1401556Srgrimes 1411556Srgrimes/* 142212243Sjilles * Perform expansions on an argument, placing the resulting list of arguments 143212243Sjilles * in arglist. Parameter expansion, command substitution and arithmetic 144212243Sjilles * expansion are always performed; additional expansions can be requested 145212243Sjilles * via flag (EXP_*). 146212243Sjilles * The result is left in the stack string. 147212243Sjilles * When arglist is NULL, perform here document expansion. A partial result 148212243Sjilles * may be written to herefd, which is then not included in the stack string. 149212243Sjilles * 150212243Sjilles * Caution: this function uses global state and is not reentrant. 151212243Sjilles * However, a new invocation after an interrupted invocation is safe 152212243Sjilles * and will reset the global state for the new call. 1531556Srgrimes */ 1541556Srgrimesvoid 15590111Simpexpandarg(union node *arg, struct arglist *arglist, int flag) 15617987Speter{ 1571556Srgrimes struct strlist *sp; 1581556Srgrimes char *p; 1591556Srgrimes 1601556Srgrimes argbackq = arg->narg.backquote; 1611556Srgrimes STARTSTACKSTR(expdest); 1621556Srgrimes ifsfirst.next = NULL; 1631556Srgrimes ifslastp = NULL; 1641556Srgrimes argstr(arg->narg.text, flag); 1651556Srgrimes if (arglist == NULL) { 1661556Srgrimes return; /* here document expanded */ 1671556Srgrimes } 1681556Srgrimes STPUTC('\0', expdest); 1691556Srgrimes p = grabstackstr(expdest); 1701556Srgrimes exparg.lastp = &exparg.list; 1711556Srgrimes /* 1721556Srgrimes * TODO - EXP_REDIR 1731556Srgrimes */ 1741556Srgrimes if (flag & EXP_FULL) { 1751556Srgrimes ifsbreakup(p, &exparg); 1761556Srgrimes *exparg.lastp = NULL; 1771556Srgrimes exparg.lastp = &exparg.list; 1781556Srgrimes expandmeta(exparg.list, flag); 1791556Srgrimes } else { 1801556Srgrimes if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ 1811556Srgrimes rmescapes(p); 1821556Srgrimes sp = (struct strlist *)stalloc(sizeof (struct strlist)); 1831556Srgrimes sp->text = p; 1841556Srgrimes *exparg.lastp = sp; 1851556Srgrimes exparg.lastp = &sp->next; 1861556Srgrimes } 1871556Srgrimes while (ifsfirst.next != NULL) { 1881556Srgrimes struct ifsregion *ifsp; 1891556Srgrimes INTOFF; 1901556Srgrimes ifsp = ifsfirst.next->next; 1911556Srgrimes ckfree(ifsfirst.next); 1921556Srgrimes ifsfirst.next = ifsp; 1931556Srgrimes INTON; 1941556Srgrimes } 1951556Srgrimes *exparg.lastp = NULL; 1961556Srgrimes if (exparg.list) { 1971556Srgrimes *arglist->lastp = exparg.list; 1981556Srgrimes arglist->lastp = exparg.lastp; 1991556Srgrimes } 2001556Srgrimes} 2011556Srgrimes 2021556Srgrimes 2031556Srgrimes 2041556Srgrimes/* 205212243Sjilles * Perform parameter expansion, command substitution and arithmetic 206212243Sjilles * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. 207212243Sjilles * Processing ends at a CTLENDVAR character as well as '\0'. 208212243Sjilles * This is used to expand word in ${var+word} etc. 209212243Sjilles * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC 210212243Sjilles * characters to allow for further processing. 211212243Sjilles * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. 2121556Srgrimes */ 2131556SrgrimesSTATIC void 21490111Simpargstr(char *p, int flag) 21517987Speter{ 21625233Ssteve char c; 217104672Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ 2181556Srgrimes int firsteq = 1; 2191556Srgrimes 2201556Srgrimes if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) 2211556Srgrimes p = exptilde(p, flag); 2221556Srgrimes for (;;) { 2231556Srgrimes switch (c = *p++) { 2241556Srgrimes case '\0': 225212243Sjilles case CTLENDVAR: 2261556Srgrimes goto breakloop; 22738887Stegge case CTLQUOTEMARK: 22838887Stegge /* "$@" syntax adherence hack */ 22938887Stegge if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') 23038887Stegge break; 23139137Stegge if ((flag & EXP_FULL) != 0) 23239137Stegge STPUTC(c, expdest); 23338887Stegge break; 2341556Srgrimes case CTLESC: 2351556Srgrimes if (quotes) 2361556Srgrimes STPUTC(c, expdest); 2371556Srgrimes c = *p++; 2381556Srgrimes STPUTC(c, expdest); 2391556Srgrimes break; 2401556Srgrimes case CTLVAR: 2411556Srgrimes p = evalvar(p, flag); 2421556Srgrimes break; 2431556Srgrimes case CTLBACKQ: 2441556Srgrimes case CTLBACKQ|CTLQUOTE: 2451556Srgrimes expbackq(argbackq->n, c & CTLQUOTE, flag); 2461556Srgrimes argbackq = argbackq->next; 2471556Srgrimes break; 2481556Srgrimes case CTLENDARI: 2491556Srgrimes expari(flag); 2501556Srgrimes break; 2511556Srgrimes case ':': 2521556Srgrimes case '=': 2531556Srgrimes /* 2541556Srgrimes * sort of a hack - expand tildes in variable 2551556Srgrimes * assignments (after the first '=' and after ':'s). 2561556Srgrimes */ 2571556Srgrimes STPUTC(c, expdest); 2581556Srgrimes if (flag & EXP_VARTILDE && *p == '~') { 2591556Srgrimes if (c == '=') { 2601556Srgrimes if (firsteq) 2611556Srgrimes firsteq = 0; 2621556Srgrimes else 2631556Srgrimes break; 2641556Srgrimes } 2651556Srgrimes p = exptilde(p, flag); 2661556Srgrimes } 2671556Srgrimes break; 2681556Srgrimes default: 2691556Srgrimes STPUTC(c, expdest); 2701556Srgrimes } 2711556Srgrimes } 2721556Srgrimesbreakloop:; 2731556Srgrimes} 2741556Srgrimes 275212243Sjilles/* 276212243Sjilles * Perform tilde expansion, placing the result in the stack string and 277212243Sjilles * returning the next position in the input string to process. 278212243Sjilles */ 2791556SrgrimesSTATIC char * 28090111Simpexptilde(char *p, int flag) 28117987Speter{ 2821556Srgrimes char c, *startp = p; 2831556Srgrimes struct passwd *pw; 2841556Srgrimes char *home; 285108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 2861556Srgrimes 28717987Speter while ((c = *p) != '\0') { 2881556Srgrimes switch(c) { 289200988Sjilles case CTLESC: /* This means CTL* are always considered quoted. */ 290200988Sjilles case CTLVAR: 291200988Sjilles case CTLBACKQ: 292200988Sjilles case CTLBACKQ | CTLQUOTE: 293200988Sjilles case CTLARI: 294200988Sjilles case CTLENDARI: 29539137Stegge case CTLQUOTEMARK: 29639137Stegge return (startp); 2971556Srgrimes case ':': 2981556Srgrimes if (flag & EXP_VARTILDE) 2991556Srgrimes goto done; 3001556Srgrimes break; 3011556Srgrimes case '/': 302206150Sjilles case CTLENDVAR: 3031556Srgrimes goto done; 3041556Srgrimes } 3051556Srgrimes p++; 3061556Srgrimes } 3071556Srgrimesdone: 3081556Srgrimes *p = '\0'; 3091556Srgrimes if (*(startp+1) == '\0') { 3101556Srgrimes if ((home = lookupvar("HOME")) == NULL) 3111556Srgrimes goto lose; 3121556Srgrimes } else { 3131556Srgrimes if ((pw = getpwnam(startp+1)) == NULL) 3141556Srgrimes goto lose; 3151556Srgrimes home = pw->pw_dir; 3161556Srgrimes } 3171556Srgrimes if (*home == '\0') 3181556Srgrimes goto lose; 3191556Srgrimes *p = c; 32017987Speter while ((c = *home++) != '\0') { 32183675Stegge if (quotes && SQSYNTAX[(int)c] == CCTL) 3221556Srgrimes STPUTC(CTLESC, expdest); 3231556Srgrimes STPUTC(c, expdest); 3241556Srgrimes } 3251556Srgrimes return (p); 3261556Srgrimeslose: 3271556Srgrimes *p = c; 3281556Srgrimes return (startp); 3291556Srgrimes} 3301556Srgrimes 3311556Srgrimes 332155301SschweikhSTATIC void 33390111Simpremoverecordregions(int endoff) 33438887Stegge{ 33538887Stegge if (ifslastp == NULL) 33638887Stegge return; 33738887Stegge 33838887Stegge if (ifsfirst.endoff > endoff) { 33938887Stegge while (ifsfirst.next != NULL) { 34038887Stegge struct ifsregion *ifsp; 34138887Stegge INTOFF; 34238887Stegge ifsp = ifsfirst.next->next; 34338887Stegge ckfree(ifsfirst.next); 34438887Stegge ifsfirst.next = ifsp; 34538887Stegge INTON; 34638887Stegge } 34738887Stegge if (ifsfirst.begoff > endoff) 34838887Stegge ifslastp = NULL; 34938887Stegge else { 35038887Stegge ifslastp = &ifsfirst; 35138887Stegge ifsfirst.endoff = endoff; 35238887Stegge } 35338887Stegge return; 35438887Stegge } 355155301Sschweikh 35638887Stegge ifslastp = &ifsfirst; 35738887Stegge while (ifslastp->next && ifslastp->next->begoff < endoff) 35838887Stegge ifslastp=ifslastp->next; 35938887Stegge while (ifslastp->next != NULL) { 36038887Stegge struct ifsregion *ifsp; 36138887Stegge INTOFF; 36238887Stegge ifsp = ifslastp->next->next; 36338887Stegge ckfree(ifslastp->next); 36438887Stegge ifslastp->next = ifsp; 36538887Stegge INTON; 36638887Stegge } 36738887Stegge if (ifslastp->endoff > endoff) 36838887Stegge ifslastp->endoff = endoff; 36938887Stegge} 37038887Stegge 3711556Srgrimes/* 3721556Srgrimes * Expand arithmetic expression. Backup to start of expression, 3731556Srgrimes * evaluate, place result in (backed up) result, adjust string position. 3741556Srgrimes */ 3751556Srgrimesvoid 37690111Simpexpari(int flag) 37717987Speter{ 378207206Sjilles char *p, *q, *start; 379178631Sstefanf arith_t result; 38038887Stegge int begoff; 381108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 38238887Stegge int quoted; 3831556Srgrimes 3841556Srgrimes /* 38546684Skris * This routine is slightly over-complicated for 3861556Srgrimes * efficiency. First we make sure there is 3871556Srgrimes * enough space for the result, which may be bigger 388212243Sjilles * than the expression. 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 */ 394178631Sstefanf CHECKSTRSPACE(DIGITS(result) - 2, expdest); 3958855Srgrimes USTPUTC('\0', expdest); 3961556Srgrimes start = stackblock(); 39783676Stegge p = expdest - 2; 39883676Stegge while (p >= start && *p != CTLARI) 3991556Srgrimes --p; 40083676Stegge if (p < start || *p != CTLARI) 4011556Srgrimes error("missing CTLARI (shouldn't happen)"); 40283676Stegge if (p > start && *(p - 1) == CTLESC) 4031556Srgrimes for (p = start; *p != CTLARI; p++) 4041556Srgrimes if (*p == CTLESC) 4051556Srgrimes p++; 40638887Stegge 40738887Stegge if (p[1] == '"') 40838887Stegge quoted=1; 40938887Stegge else 41038887Stegge quoted=0; 41138887Stegge begoff = p - start; 41238887Stegge removerecordregions(begoff); 4131556Srgrimes if (quotes) 41438887Stegge rmescapes(p+2); 415207206Sjilles q = grabstackstr(expdest); 41638887Stegge result = arith(p+2); 417207206Sjilles ungrabstackstr(q, expdest); 418178631Sstefanf fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); 4191556Srgrimes while (*p++) 4201556Srgrimes ; 42138887Stegge if (quoted == 0) 42238887Stegge recordregion(begoff, p - 1 - start, 0); 4231556Srgrimes result = expdest - p + 1; 4241556Srgrimes STADJUST(-result, expdest); 4251556Srgrimes} 4261556Srgrimes 4271556Srgrimes 4281556Srgrimes/* 429212243Sjilles * Perform command substitution. 4301556Srgrimes */ 4311556SrgrimesSTATIC void 43290111Simpexpbackq(union node *cmd, int quoted, int flag) 43317987Speter{ 4341556Srgrimes struct backcmd in; 4351556Srgrimes int i; 4361556Srgrimes char buf[128]; 4371556Srgrimes char *p; 4381556Srgrimes char *dest = expdest; 4391556Srgrimes struct ifsregion saveifs, *savelastp; 4401556Srgrimes struct nodelist *saveargbackq; 4411556Srgrimes char lastc; 4421556Srgrimes int startloc = dest - stackblock(); 4431556Srgrimes char const *syntax = quoted? DQSYNTAX : BASESYNTAX; 4441556Srgrimes int saveherefd; 445108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 446115424Sfenner int nnl; 4471556Srgrimes 4481556Srgrimes INTOFF; 4491556Srgrimes saveifs = ifsfirst; 4501556Srgrimes savelastp = ifslastp; 4511556Srgrimes saveargbackq = argbackq; 4528855Srgrimes saveherefd = herefd; 4531556Srgrimes herefd = -1; 4541556Srgrimes p = grabstackstr(dest); 4551556Srgrimes evalbackcmd(cmd, &in); 4561556Srgrimes ungrabstackstr(p, dest); 4571556Srgrimes ifsfirst = saveifs; 4581556Srgrimes ifslastp = savelastp; 4591556Srgrimes argbackq = saveargbackq; 4601556Srgrimes herefd = saveherefd; 4611556Srgrimes 4621556Srgrimes p = in.buf; 4631556Srgrimes lastc = '\0'; 464115424Sfenner nnl = 0; 465115424Sfenner /* Don't copy trailing newlines */ 4661556Srgrimes for (;;) { 4671556Srgrimes if (--in.nleft < 0) { 4681556Srgrimes if (in.fd < 0) 4691556Srgrimes break; 4701556Srgrimes while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR); 4711556Srgrimes TRACE(("expbackq: read returns %d\n", i)); 4721556Srgrimes if (i <= 0) 4731556Srgrimes break; 4741556Srgrimes p = buf; 4751556Srgrimes in.nleft = i - 1; 4761556Srgrimes } 4771556Srgrimes lastc = *p++; 4781556Srgrimes if (lastc != '\0') { 47983675Stegge if (quotes && syntax[(int)lastc] == CCTL) 4801556Srgrimes STPUTC(CTLESC, dest); 481115424Sfenner if (lastc == '\n') { 482115424Sfenner nnl++; 483115424Sfenner } else { 484115424Sfenner while (nnl > 0) { 485115424Sfenner nnl--; 486115424Sfenner STPUTC('\n', dest); 487115424Sfenner } 488115424Sfenner STPUTC(lastc, dest); 489115424Sfenner } 4901556Srgrimes } 4911556Srgrimes } 49217987Speter 4931556Srgrimes if (in.fd >= 0) 4941556Srgrimes close(in.fd); 4951556Srgrimes if (in.buf) 4961556Srgrimes ckfree(in.buf); 4971556Srgrimes if (in.jp) 49845916Scracauer exitstatus = waitforjob(in.jp, (int *)NULL); 4991556Srgrimes if (quoted == 0) 5001556Srgrimes recordregion(startloc, dest - stackblock(), 0); 501213775Sjhb TRACE(("expbackq: size=%td: \"%.*s\"\n", 502213775Sjhb ((dest - stackblock()) - startloc), 503213775Sjhb (int)((dest - stackblock()) - startloc), 5041556Srgrimes stackblock() + startloc)); 5051556Srgrimes expdest = dest; 5061556Srgrimes INTON; 5071556Srgrimes} 5081556Srgrimes 5091556Srgrimes 5101556Srgrimes 51117987SpeterSTATIC int 51290111Simpsubevalvar(char *p, char *str, int strloc, int subtype, int startloc, 51390111Simp int varflags) 51417987Speter{ 51517987Speter char *startp; 51617987Speter char *loc = NULL; 51745514Stegge char *q; 51817987Speter int c = 0; 51917987Speter int saveherefd = herefd; 52017987Speter struct nodelist *saveargbackq = argbackq; 52120425Ssteve int amount; 52220425Ssteve 52317987Speter herefd = -1; 524206150Sjilles argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || 525206147Sjilles subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? 526206150Sjilles EXP_CASE : 0) | EXP_TILDE); 52717987Speter STACKSTRNUL(expdest); 52817987Speter herefd = saveherefd; 52917987Speter argbackq = saveargbackq; 53017987Speter startp = stackblock() + startloc; 53120425Ssteve if (str == NULL) 53220425Ssteve str = stackblock() + strloc; 53317987Speter 53417987Speter switch (subtype) { 53517987Speter case VSASSIGN: 53617987Speter setvar(str, startp, 0); 53720425Ssteve amount = startp - expdest; 53820425Ssteve STADJUST(amount, expdest); 53917987Speter varflags &= ~VSNUL; 54017987Speter if (c != 0) 54117987Speter *loc = c; 54217987Speter return 1; 54317987Speter 54417987Speter case VSQUESTION: 54517987Speter if (*p != CTLENDVAR) { 546201366Sjilles outfmt(out2, "%s\n", startp); 54717987Speter error((char *)NULL); 54817987Speter } 549112254Sru error("%.*s: parameter %snot set", (int)(p - str - 1), 55017987Speter str, (varflags & VSNUL) ? "null or " 55117987Speter : nullstr); 55217987Speter return 0; 55317987Speter 55417987Speter case VSTRIMLEFT: 55525233Ssteve for (loc = startp; loc < str; loc++) { 55617987Speter c = *loc; 55717987Speter *loc = '\0'; 55845514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 55917987Speter *loc = c; 56017987Speter goto recordleft; 56117987Speter } 56217987Speter *loc = c; 56345514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 56445514Stegge loc++; 56517987Speter } 56617987Speter return 0; 56717987Speter 56817987Speter case VSTRIMLEFTMAX: 56945514Stegge for (loc = str - 1; loc >= startp;) { 57017987Speter c = *loc; 57117987Speter *loc = '\0'; 57245514Stegge if (patmatch(str, startp, varflags & VSQUOTE)) { 57317987Speter *loc = c; 57417987Speter goto recordleft; 57517987Speter } 57617987Speter *loc = c; 57745514Stegge loc--; 57845514Stegge if ((varflags & VSQUOTE) && loc > startp && 57945514Stegge *(loc - 1) == CTLESC) { 58045514Stegge for (q = startp; q < loc; q++) 58145514Stegge if (*q == CTLESC) 58245514Stegge q++; 58345514Stegge if (q > loc) 58445514Stegge loc--; 58545514Stegge } 58617987Speter } 58717987Speter return 0; 58817987Speter 58917987Speter case VSTRIMRIGHT: 59045514Stegge for (loc = str - 1; loc >= startp;) { 59145514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 59220425Ssteve amount = loc - expdest; 59320425Ssteve STADJUST(amount, expdest); 59417987Speter return 1; 59517987Speter } 59645514Stegge loc--; 59745514Stegge if ((varflags & VSQUOTE) && loc > startp && 598155301Sschweikh *(loc - 1) == CTLESC) { 59945514Stegge for (q = startp; q < loc; q++) 60045514Stegge if (*q == CTLESC) 60145514Stegge q++; 60245514Stegge if (q > loc) 60345514Stegge loc--; 60445514Stegge } 60517987Speter } 60617987Speter return 0; 60717987Speter 60817987Speter case VSTRIMRIGHTMAX: 60917987Speter for (loc = startp; loc < str - 1; loc++) { 61045514Stegge if (patmatch(str, loc, varflags & VSQUOTE)) { 61120425Ssteve amount = loc - expdest; 61220425Ssteve STADJUST(amount, expdest); 61317987Speter return 1; 61417987Speter } 61545514Stegge if ((varflags & VSQUOTE) && *loc == CTLESC) 61645514Stegge loc++; 61717987Speter } 61817987Speter return 0; 61917987Speter 62017987Speter 62117987Speter default: 62217987Speter abort(); 62317987Speter } 62417987Speter 62517987Speterrecordleft: 62620425Ssteve amount = ((str - 1) - (loc - startp)) - expdest; 62720425Ssteve STADJUST(amount, expdest); 62817987Speter while (loc != str - 1) 62917987Speter *startp++ = *loc++; 63017987Speter return 1; 63117987Speter} 63217987Speter 63317987Speter 6341556Srgrimes/* 6351556Srgrimes * Expand a variable, and return a pointer to the next character in the 6361556Srgrimes * input string. 6371556Srgrimes */ 6381556Srgrimes 6391556SrgrimesSTATIC char * 64090111Simpevalvar(char *p, int flag) 64117987Speter{ 6421556Srgrimes int subtype; 6431556Srgrimes int varflags; 6441556Srgrimes char *var; 6451556Srgrimes char *val; 64645644Stegge int patloc; 6471556Srgrimes int c; 6481556Srgrimes int set; 6491556Srgrimes int special; 6501556Srgrimes int startloc; 65117987Speter int varlen; 65217987Speter int easy; 653108935Stjr int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); 6541556Srgrimes 655164081Sstefanf varflags = (unsigned char)*p++; 6561556Srgrimes subtype = varflags & VSTYPE; 6571556Srgrimes var = p; 6581556Srgrimes special = 0; 6591556Srgrimes if (! is_name(*p)) 6601556Srgrimes special = 1; 6611556Srgrimes p = strchr(p, '=') + 1; 6621556Srgrimesagain: /* jump here after setting a variable with ${var=text} */ 663179022Sstefanf if (varflags & VSLINENO) { 664179022Sstefanf set = 1; 665179022Sstefanf special = 0; 666179022Sstefanf val = var; 667179022Sstefanf p[-1] = '\0'; /* temporarily overwrite '=' to have \0 668179022Sstefanf terminated string */ 669179022Sstefanf } else if (special) { 67025233Ssteve set = varisset(var, varflags & VSNUL); 6711556Srgrimes val = NULL; 6721556Srgrimes } else { 67360592Scracauer val = bltinlookup(var, 1); 67417987Speter if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { 6751556Srgrimes val = NULL; 6761556Srgrimes set = 0; 6771556Srgrimes } else 6781556Srgrimes set = 1; 6791556Srgrimes } 68017987Speter varlen = 0; 6811556Srgrimes startloc = expdest - stackblock(); 682198454Sjilles if (!set && uflag && *var != '@' && *var != '*') { 68396939Stjr switch (subtype) { 68496939Stjr case VSNORMAL: 68596939Stjr case VSTRIMLEFT: 68696939Stjr case VSTRIMLEFTMAX: 68796939Stjr case VSTRIMRIGHT: 68896939Stjr case VSTRIMRIGHTMAX: 68996939Stjr case VSLENGTH: 690112254Sru error("%.*s: parameter not set", (int)(p - var - 1), 691112254Sru var); 69296939Stjr } 69396939Stjr } 6941556Srgrimes if (set && subtype != VSPLUS) { 6951556Srgrimes /* insert the value of the variable */ 6961556Srgrimes if (special) { 697164081Sstefanf varvalue(var, varflags & VSQUOTE, subtype, flag); 69817987Speter if (subtype == VSLENGTH) { 69925233Ssteve varlen = expdest - stackblock() - startloc; 70025233Ssteve STADJUST(-varlen, expdest); 70117987Speter } 7021556Srgrimes } else { 70320425Ssteve char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX 70417987Speter : BASESYNTAX; 7051556Srgrimes 70617987Speter if (subtype == VSLENGTH) { 70717987Speter for (;*val; val++) 70817987Speter varlen++; 7091556Srgrimes } 71017987Speter else { 71117987Speter while (*val) { 71283675Stegge if (quotes && 71354132Scracauer syntax[(int)*val] == CCTL) 71417987Speter STPUTC(CTLESC, expdest); 71517987Speter STPUTC(*val++, expdest); 71617987Speter } 71717987Speter 71817987Speter } 7191556Srgrimes } 7201556Srgrimes } 72120425Ssteve 7221556Srgrimes if (subtype == VSPLUS) 7231556Srgrimes set = ! set; 72417987Speter 72520425Ssteve easy = ((varflags & VSQUOTE) == 0 || 72617987Speter (*var == '@' && shellparam.nparam != 1)); 72717987Speter 72817987Speter 72917987Speter switch (subtype) { 73017987Speter case VSLENGTH: 73117987Speter expdest = cvtnum(varlen, expdest); 73217987Speter goto record; 73317987Speter 73417987Speter case VSNORMAL: 73517987Speter if (!easy) 73617987Speter break; 73717987Speterrecord: 73820425Ssteve recordregion(startloc, expdest - stackblock(), 73917987Speter varflags & VSQUOTE); 74017987Speter break; 74117987Speter 74217987Speter case VSPLUS: 74317987Speter case VSMINUS: 74417987Speter if (!set) { 7451556Srgrimes argstr(p, flag); 74617987Speter break; 74717987Speter } 74817987Speter if (easy) 74917987Speter goto record; 75017987Speter break; 75117987Speter 75217987Speter case VSTRIMLEFT: 75317987Speter case VSTRIMLEFTMAX: 75417987Speter case VSTRIMRIGHT: 75517987Speter case VSTRIMRIGHTMAX: 75617987Speter if (!set) 75717987Speter break; 75817987Speter /* 75917987Speter * Terminate the string and start recording the pattern 76017987Speter * right after it 76117987Speter */ 76217987Speter STPUTC('\0', expdest); 76345644Stegge patloc = expdest - stackblock(); 76445644Stegge if (subevalvar(p, NULL, patloc, subtype, 76538887Stegge startloc, varflags) == 0) { 76645644Stegge int amount = (expdest - stackblock() - patloc) + 1; 76725233Ssteve STADJUST(-amount, expdest); 76825233Ssteve } 76938887Stegge /* Remove any recorded regions beyond start of variable */ 77038887Stegge removerecordregions(startloc); 77138887Stegge goto record; 77217987Speter 77317987Speter case VSASSIGN: 77417987Speter case VSQUESTION: 77517987Speter if (!set) { 77620425Ssteve if (subevalvar(p, var, 0, subtype, startloc, varflags)) { 77720425Ssteve varflags &= ~VSNUL; 778155301Sschweikh /* 779155301Sschweikh * Remove any recorded regions beyond 780155301Sschweikh * start of variable 78138887Stegge */ 78238887Stegge removerecordregions(startloc); 7831556Srgrimes goto again; 78420425Ssteve } 78517987Speter break; 7861556Srgrimes } 78717987Speter if (easy) 78817987Speter goto record; 78917987Speter break; 79017987Speter 791164003Sstefanf case VSERROR: 792164003Sstefanf c = p - var - 1; 793164003Sstefanf error("${%.*s%s}: Bad substitution", c, var, 794164003Sstefanf (c > 0 && *p != CTLENDVAR) ? "..." : ""); 795164003Sstefanf 79617987Speter default: 79717987Speter abort(); 7981556Srgrimes } 799179022Sstefanf p[-1] = '='; /* recover overwritten '=' */ 80017987Speter 8011556Srgrimes if (subtype != VSNORMAL) { /* skip to end of alternative */ 8021556Srgrimes int nesting = 1; 8031556Srgrimes for (;;) { 8041556Srgrimes if ((c = *p++) == CTLESC) 8051556Srgrimes p++; 8061556Srgrimes else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { 8071556Srgrimes if (set) 8081556Srgrimes argbackq = argbackq->next; 8091556Srgrimes } else if (c == CTLVAR) { 8101556Srgrimes if ((*p++ & VSTYPE) != VSNORMAL) 8111556Srgrimes nesting++; 8121556Srgrimes } else if (c == CTLENDVAR) { 8131556Srgrimes if (--nesting == 0) 8141556Srgrimes break; 8151556Srgrimes } 8161556Srgrimes } 8171556Srgrimes } 8181556Srgrimes return p; 8191556Srgrimes} 8201556Srgrimes 8211556Srgrimes 8221556Srgrimes 8231556Srgrimes/* 8241556Srgrimes * Test whether a specialized variable is set. 8251556Srgrimes */ 8261556Srgrimes 8271556SrgrimesSTATIC int 82890111Simpvarisset(char *name, int nulok) 82925233Ssteve{ 8301556Srgrimes 83125233Ssteve if (*name == '!') 832209600Sjilles return backgndpidset(); 83325233Ssteve else if (*name == '@' || *name == '*') { 8341556Srgrimes if (*shellparam.p == NULL) 8351556Srgrimes return 0; 83625233Ssteve 83725233Ssteve if (nulok) { 83825233Ssteve char **av; 83925233Ssteve 84025233Ssteve for (av = shellparam.p; *av; av++) 84125233Ssteve if (**av != '\0') 84225233Ssteve return 1; 84325233Ssteve return 0; 84425233Ssteve } 84518202Speter } else if (is_digit(*name)) { 84625233Ssteve char *ap; 84720425Ssteve int num = atoi(name); 84825233Ssteve 84925233Ssteve if (num > shellparam.nparam) 85025233Ssteve return 0; 85125233Ssteve 85225233Ssteve if (num == 0) 85325233Ssteve ap = arg0; 85425233Ssteve else 85525233Ssteve ap = shellparam.p[num - 1]; 85625233Ssteve 85725233Ssteve if (nulok && (ap == NULL || *ap == '\0')) 85825233Ssteve return 0; 8591556Srgrimes } 8601556Srgrimes return 1; 8611556Srgrimes} 8621556Srgrimes 8631556Srgrimes 8641556Srgrimes 8651556Srgrimes/* 8661556Srgrimes * Add the value of a specialized variable to the stack string. 8671556Srgrimes */ 8681556Srgrimes 8691556SrgrimesSTATIC void 870164081Sstefanfvarvalue(char *name, int quoted, int subtype, int flag) 87117987Speter{ 8721556Srgrimes int num; 8731556Srgrimes char *p; 8741556Srgrimes int i; 8751556Srgrimes char sep; 8761556Srgrimes char **ap; 8771556Srgrimes char const *syntax; 8781556Srgrimes 8791556Srgrimes#define STRTODEST(p) \ 8801556Srgrimes do {\ 881164081Sstefanf if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) { \ 8821556Srgrimes syntax = quoted? DQSYNTAX : BASESYNTAX; \ 8831556Srgrimes while (*p) { \ 88483675Stegge if (syntax[(int)*p] == CCTL) \ 8851556Srgrimes STPUTC(CTLESC, expdest); \ 8861556Srgrimes STPUTC(*p++, expdest); \ 8871556Srgrimes } \ 8881556Srgrimes } else \ 8891556Srgrimes while (*p) \ 8901556Srgrimes STPUTC(*p++, expdest); \ 8911556Srgrimes } while (0) 8921556Srgrimes 8931556Srgrimes 89418202Speter switch (*name) { 8951556Srgrimes case '$': 8961556Srgrimes num = rootpid; 8971556Srgrimes goto numvar; 8981556Srgrimes case '?': 89917987Speter num = oexitstatus; 9001556Srgrimes goto numvar; 9011556Srgrimes case '#': 9021556Srgrimes num = shellparam.nparam; 9031556Srgrimes goto numvar; 9041556Srgrimes case '!': 905209600Sjilles num = backgndpidval(); 9061556Srgrimesnumvar: 90717987Speter expdest = cvtnum(num, expdest); 9081556Srgrimes break; 9091556Srgrimes case '-': 9101556Srgrimes for (i = 0 ; i < NOPTS ; i++) { 9111556Srgrimes if (optlist[i].val) 9121556Srgrimes STPUTC(optlist[i].letter, expdest); 9131556Srgrimes } 9141556Srgrimes break; 9151556Srgrimes case '@': 916164081Sstefanf if (flag & EXP_FULL && quoted) { 91738887Stegge for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 91838887Stegge STRTODEST(p); 91938887Stegge if (*ap) 92038887Stegge STPUTC('\0', expdest); 92138887Stegge } 92238887Stegge break; 9231556Srgrimes } 924102410Scharnier /* FALLTHROUGH */ 9251556Srgrimes case '*': 926149825Srse if (ifsset()) 92738887Stegge sep = ifsval()[0]; 92838887Stegge else 92938887Stegge sep = ' '; 9301556Srgrimes for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { 9311556Srgrimes STRTODEST(p); 93238887Stegge if (*ap && sep) 9331556Srgrimes STPUTC(sep, expdest); 9341556Srgrimes } 9351556Srgrimes break; 9361556Srgrimes case '0': 9371556Srgrimes p = arg0; 9381556Srgrimes STRTODEST(p); 9391556Srgrimes break; 9401556Srgrimes default: 94118202Speter if (is_digit(*name)) { 94218202Speter num = atoi(name); 94318202Speter if (num > 0 && num <= shellparam.nparam) { 94418202Speter p = shellparam.p[num - 1]; 94518202Speter STRTODEST(p); 94618202Speter } 9471556Srgrimes } 9481556Srgrimes break; 9491556Srgrimes } 9501556Srgrimes} 9511556Srgrimes 9521556Srgrimes 9531556Srgrimes 9541556Srgrimes/* 9551556Srgrimes * Record the the fact that we have to scan this region of the 9561556Srgrimes * string for IFS characters. 9571556Srgrimes */ 9581556Srgrimes 9591556SrgrimesSTATIC void 960194975Sjillesrecordregion(int start, int end, int inquotes) 96117987Speter{ 96225233Ssteve struct ifsregion *ifsp; 9631556Srgrimes 9641556Srgrimes if (ifslastp == NULL) { 9651556Srgrimes ifsp = &ifsfirst; 9661556Srgrimes } else { 967194975Sjilles if (ifslastp->endoff == start 968194975Sjilles && ifslastp->inquotes == inquotes) { 969194975Sjilles /* extend previous area */ 970194975Sjilles ifslastp->endoff = end; 971194975Sjilles return; 972194975Sjilles } 9731556Srgrimes ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); 9741556Srgrimes ifslastp->next = ifsp; 9751556Srgrimes } 9761556Srgrimes ifslastp = ifsp; 9771556Srgrimes ifslastp->next = NULL; 9781556Srgrimes ifslastp->begoff = start; 9791556Srgrimes ifslastp->endoff = end; 980194975Sjilles ifslastp->inquotes = inquotes; 9811556Srgrimes} 9821556Srgrimes 9831556Srgrimes 9841556Srgrimes 9851556Srgrimes/* 9861556Srgrimes * Break the argument string into pieces based upon IFS and add the 9871556Srgrimes * strings to the argument list. The regions of the string to be 9881556Srgrimes * searched for IFS characters have been stored by recordregion. 989212243Sjilles * CTLESC characters are preserved but have little effect in this pass 990212243Sjilles * other than escaping CTL* characters. In particular, they do not escape 991212243Sjilles * IFS characters: that should be done with the ifsregion mechanism. 992212243Sjilles * CTLQUOTEMARK characters are used to preserve empty quoted strings. 993212243Sjilles * This pass treats them as a regular character, making the string non-empty. 994212243Sjilles * Later, they are removed along with the other CTL* characters. 9951556Srgrimes */ 9961556SrgrimesSTATIC void 99790111Simpifsbreakup(char *string, struct arglist *arglist) 99890111Simp{ 9991556Srgrimes struct ifsregion *ifsp; 10001556Srgrimes struct strlist *sp; 10011556Srgrimes char *start; 100225233Ssteve char *p; 10031556Srgrimes char *q; 1004201053Sjilles const char *ifs; 1005194975Sjilles const char *ifsspc; 1006194975Sjilles int had_param_ch = 0; 10071556Srgrimes 1008194975Sjilles start = string; 100917987Speter 1010194975Sjilles if (ifslastp == NULL) { 1011194975Sjilles /* Return entire argument, IFS doesn't apply to any of it */ 1012194975Sjilles sp = (struct strlist *)stalloc(sizeof *sp); 1013194975Sjilles sp->text = start; 1014194975Sjilles *arglist->lastp = sp; 1015194975Sjilles arglist->lastp = &sp->next; 1016194975Sjilles return; 1017194975Sjilles } 1018194975Sjilles 1019194975Sjilles ifs = ifsset() ? ifsval() : " \t\n"; 1020194975Sjilles 1021194975Sjilles for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { 1022194975Sjilles p = string + ifsp->begoff; 1023194975Sjilles while (p < string + ifsp->endoff) { 1024194975Sjilles q = p; 1025194975Sjilles if (*p == CTLESC) 1026194975Sjilles p++; 1027194975Sjilles if (ifsp->inquotes) { 1028194975Sjilles /* Only NULs (should be from "$@") end args */ 1029194977Sjilles had_param_ch = 1; 1030194975Sjilles if (*p != 0) { 10311556Srgrimes p++; 1032194975Sjilles continue; 1033194975Sjilles } 1034194975Sjilles ifsspc = NULL; 1035194975Sjilles } else { 1036194975Sjilles if (!strchr(ifs, *p)) { 1037194977Sjilles had_param_ch = 1; 103838887Stegge p++; 1039194975Sjilles continue; 1040194975Sjilles } 1041194975Sjilles ifsspc = strchr(" \t\n", *p); 1042194975Sjilles 1043194975Sjilles /* Ignore IFS whitespace at start */ 1044194975Sjilles if (q == start && ifsspc != NULL) { 1045194975Sjilles p++; 10461556Srgrimes start = p; 1047194975Sjilles continue; 1048194975Sjilles } 1049194977Sjilles had_param_ch = 0; 10501556Srgrimes } 1051194975Sjilles 1052194975Sjilles /* Save this argument... */ 1053194975Sjilles *q = '\0'; 10541556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10551556Srgrimes sp->text = start; 10561556Srgrimes *arglist->lastp = sp; 10571556Srgrimes arglist->lastp = &sp->next; 1058194975Sjilles p++; 1059194975Sjilles 1060194975Sjilles if (ifsspc != NULL) { 1061194975Sjilles /* Ignore further trailing IFS whitespace */ 1062194975Sjilles for (; p < string + ifsp->endoff; p++) { 1063194975Sjilles q = p; 1064194975Sjilles if (*p == CTLESC) 1065194975Sjilles p++; 1066194975Sjilles if (strchr(ifs, *p) == NULL) { 1067194975Sjilles p = q; 1068194975Sjilles break; 1069194975Sjilles } 1070194975Sjilles if (strchr(" \t\n", *p) == NULL) { 1071194975Sjilles p++; 1072194975Sjilles break; 1073194975Sjilles } 1074194975Sjilles } 1075194975Sjilles } 1076194975Sjilles start = p; 10771556Srgrimes } 1078194975Sjilles } 1079194975Sjilles 1080194975Sjilles /* 1081194975Sjilles * Save anything left as an argument. 1082194975Sjilles * Traditionally we have treated 'IFS=':'; set -- x$IFS' as 1083194975Sjilles * generating 2 arguments, the second of which is empty. 1084194975Sjilles * Some recent clarification of the Posix spec say that it 1085194975Sjilles * should only generate one.... 1086194975Sjilles */ 1087194975Sjilles if (had_param_ch || *start != 0) { 10881556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 10891556Srgrimes sp->text = start; 10901556Srgrimes *arglist->lastp = sp; 10911556Srgrimes arglist->lastp = &sp->next; 10921556Srgrimes } 10931556Srgrimes} 10941556Srgrimes 10951556Srgrimes 1096213760Sobrienstatic char expdir[PATH_MAX]; 1097212243Sjilles#define expdir_end (expdir + sizeof(expdir)) 10981556Srgrimes 10991556Srgrimes/* 1100212243Sjilles * Perform pathname generation and remove control characters. 1101212243Sjilles * At this point, the only control characters should be CTLESC and CTLQUOTEMARK. 1102212243Sjilles * The results are stored in the list exparg. 11031556Srgrimes */ 11041556SrgrimesSTATIC void 110590111Simpexpandmeta(struct strlist *str, int flag __unused) 110617987Speter{ 11071556Srgrimes char *p; 11081556Srgrimes struct strlist **savelastp; 11091556Srgrimes struct strlist *sp; 11101556Srgrimes char c; 11111556Srgrimes /* TODO - EXP_REDIR */ 11121556Srgrimes 11131556Srgrimes while (str) { 11141556Srgrimes if (fflag) 11151556Srgrimes goto nometa; 11161556Srgrimes p = str->text; 11171556Srgrimes for (;;) { /* fast check for meta chars */ 11181556Srgrimes if ((c = *p++) == '\0') 11191556Srgrimes goto nometa; 1120211646Sjilles if (c == '*' || c == '?' || c == '[') 11211556Srgrimes break; 11221556Srgrimes } 11231556Srgrimes savelastp = exparg.lastp; 11241556Srgrimes INTOFF; 11251556Srgrimes expmeta(expdir, str->text); 11261556Srgrimes INTON; 11271556Srgrimes if (exparg.lastp == savelastp) { 11288855Srgrimes /* 11298855Srgrimes * no matches 11301556Srgrimes */ 11311556Srgrimesnometa: 11321556Srgrimes *exparg.lastp = str; 11331556Srgrimes rmescapes(str->text); 11341556Srgrimes exparg.lastp = &str->next; 11351556Srgrimes } else { 11361556Srgrimes *exparg.lastp = NULL; 11371556Srgrimes *savelastp = sp = expsort(*savelastp); 11381556Srgrimes while (sp->next != NULL) 11391556Srgrimes sp = sp->next; 11401556Srgrimes exparg.lastp = &sp->next; 11411556Srgrimes } 11421556Srgrimes str = str->next; 11431556Srgrimes } 11441556Srgrimes} 11451556Srgrimes 11461556Srgrimes 11471556Srgrimes/* 11481556Srgrimes * Do metacharacter (i.e. *, ?, [...]) expansion. 11491556Srgrimes */ 11501556Srgrimes 11511556SrgrimesSTATIC void 115290111Simpexpmeta(char *enddir, char *name) 115390111Simp{ 115425233Ssteve char *p; 11551556Srgrimes char *q; 11561556Srgrimes char *start; 11571556Srgrimes char *endname; 11581556Srgrimes int metaflag; 11591556Srgrimes struct stat statb; 11601556Srgrimes DIR *dirp; 11611556Srgrimes struct dirent *dp; 11621556Srgrimes int atend; 11631556Srgrimes int matchdot; 1164207944Sjilles int esc; 11651556Srgrimes 11661556Srgrimes metaflag = 0; 11671556Srgrimes start = name; 1168207944Sjilles for (p = name; esc = 0, *p; p += esc + 1) { 11691556Srgrimes if (*p == '*' || *p == '?') 11701556Srgrimes metaflag = 1; 11711556Srgrimes else if (*p == '[') { 11721556Srgrimes q = p + 1; 117326488Sache if (*q == '!' || *q == '^') 11741556Srgrimes q++; 11751556Srgrimes for (;;) { 117638887Stegge while (*q == CTLQUOTEMARK) 117738887Stegge q++; 11781556Srgrimes if (*q == CTLESC) 11791556Srgrimes q++; 11801556Srgrimes if (*q == '/' || *q == '\0') 11811556Srgrimes break; 11821556Srgrimes if (*++q == ']') { 11831556Srgrimes metaflag = 1; 11841556Srgrimes break; 11851556Srgrimes } 11861556Srgrimes } 11871556Srgrimes } else if (*p == '\0') 11881556Srgrimes break; 118938887Stegge else if (*p == CTLQUOTEMARK) 119038887Stegge continue; 1191207944Sjilles else { 1192207944Sjilles if (*p == CTLESC) 1193207944Sjilles esc++; 1194207944Sjilles if (p[esc] == '/') { 1195207944Sjilles if (metaflag) 1196207944Sjilles break; 1197207944Sjilles start = p + esc + 1; 1198207944Sjilles } 11991556Srgrimes } 12001556Srgrimes } 12011556Srgrimes if (metaflag == 0) { /* we've reached the end of the file name */ 12021556Srgrimes if (enddir != expdir) 12031556Srgrimes metaflag++; 12041556Srgrimes for (p = name ; ; p++) { 120538887Stegge if (*p == CTLQUOTEMARK) 120638887Stegge continue; 12071556Srgrimes if (*p == CTLESC) 12081556Srgrimes p++; 12091556Srgrimes *enddir++ = *p; 12101556Srgrimes if (*p == '\0') 12111556Srgrimes break; 1212211155Sjilles if (enddir == expdir_end) 1213211155Sjilles return; 12141556Srgrimes } 1215147812Sdelphij if (metaflag == 0 || lstat(expdir, &statb) >= 0) 12161556Srgrimes addfname(expdir); 12171556Srgrimes return; 12181556Srgrimes } 12191556Srgrimes endname = p; 12201556Srgrimes if (start != name) { 12211556Srgrimes p = name; 12221556Srgrimes while (p < start) { 122338887Stegge while (*p == CTLQUOTEMARK) 122438887Stegge p++; 12251556Srgrimes if (*p == CTLESC) 12261556Srgrimes p++; 12271556Srgrimes *enddir++ = *p++; 1228211155Sjilles if (enddir == expdir_end) 1229211155Sjilles return; 12301556Srgrimes } 12311556Srgrimes } 12321556Srgrimes if (enddir == expdir) { 12331556Srgrimes p = "."; 12341556Srgrimes } else if (enddir == expdir + 1 && *expdir == '/') { 12351556Srgrimes p = "/"; 12361556Srgrimes } else { 12371556Srgrimes p = expdir; 12381556Srgrimes enddir[-1] = '\0'; 12391556Srgrimes } 12401556Srgrimes if ((dirp = opendir(p)) == NULL) 12411556Srgrimes return; 12421556Srgrimes if (enddir != expdir) 12431556Srgrimes enddir[-1] = '/'; 12441556Srgrimes if (*endname == 0) { 12451556Srgrimes atend = 1; 12461556Srgrimes } else { 12471556Srgrimes atend = 0; 1248207944Sjilles *endname = '\0'; 1249207944Sjilles endname += esc + 1; 12501556Srgrimes } 12511556Srgrimes matchdot = 0; 125238887Stegge p = start; 125338887Stegge while (*p == CTLQUOTEMARK) 125438887Stegge p++; 125538887Stegge if (*p == CTLESC) 125638887Stegge p++; 125738887Stegge if (*p == '.') 12581556Srgrimes matchdot++; 12591556Srgrimes while (! int_pending() && (dp = readdir(dirp)) != NULL) { 12601556Srgrimes if (dp->d_name[0] == '.' && ! matchdot) 12611556Srgrimes continue; 126245514Stegge if (patmatch(start, dp->d_name, 0)) { 1263211155Sjilles if (enddir + dp->d_namlen + 1 > expdir_end) 1264211155Sjilles continue; 1265211155Sjilles memcpy(enddir, dp->d_name, dp->d_namlen + 1); 1266211155Sjilles if (atend) 12671556Srgrimes addfname(expdir); 1268211155Sjilles else { 1269211155Sjilles if (enddir + dp->d_namlen + 2 > expdir_end) 127017987Speter continue; 1271211155Sjilles enddir[dp->d_namlen] = '/'; 1272211155Sjilles enddir[dp->d_namlen + 1] = '\0'; 1273211155Sjilles expmeta(enddir + dp->d_namlen + 1, endname); 12741556Srgrimes } 12751556Srgrimes } 12761556Srgrimes } 12771556Srgrimes closedir(dirp); 12781556Srgrimes if (! atend) 1279207944Sjilles endname[-esc - 1] = esc ? CTLESC : '/'; 12801556Srgrimes} 12811556Srgrimes 12821556Srgrimes 12831556Srgrimes/* 12841556Srgrimes * Add a file name to the list. 12851556Srgrimes */ 12861556Srgrimes 12871556SrgrimesSTATIC void 128890111Simpaddfname(char *name) 128990111Simp{ 12901556Srgrimes char *p; 12911556Srgrimes struct strlist *sp; 12921556Srgrimes 12931556Srgrimes p = stalloc(strlen(name) + 1); 12941556Srgrimes scopy(name, p); 12951556Srgrimes sp = (struct strlist *)stalloc(sizeof *sp); 12961556Srgrimes sp->text = p; 12971556Srgrimes *exparg.lastp = sp; 12981556Srgrimes exparg.lastp = &sp->next; 12991556Srgrimes} 13001556Srgrimes 13011556Srgrimes 13021556Srgrimes/* 13031556Srgrimes * Sort the results of file name expansion. It calculates the number of 13041556Srgrimes * strings to sort and then calls msort (short for merge sort) to do the 13051556Srgrimes * work. 13061556Srgrimes */ 13071556Srgrimes 13081556SrgrimesSTATIC struct strlist * 130990111Simpexpsort(struct strlist *str) 131090111Simp{ 13111556Srgrimes int len; 13121556Srgrimes struct strlist *sp; 13131556Srgrimes 13141556Srgrimes len = 0; 13151556Srgrimes for (sp = str ; sp ; sp = sp->next) 13161556Srgrimes len++; 13171556Srgrimes return msort(str, len); 13181556Srgrimes} 13191556Srgrimes 13201556Srgrimes 13211556SrgrimesSTATIC struct strlist * 132290111Simpmsort(struct strlist *list, int len) 132317987Speter{ 132417987Speter struct strlist *p, *q = NULL; 13251556Srgrimes struct strlist **lpp; 13261556Srgrimes int half; 13271556Srgrimes int n; 13281556Srgrimes 13291556Srgrimes if (len <= 1) 13301556Srgrimes return list; 13318855Srgrimes half = len >> 1; 13321556Srgrimes p = list; 13331556Srgrimes for (n = half ; --n >= 0 ; ) { 13341556Srgrimes q = p; 13351556Srgrimes p = p->next; 13361556Srgrimes } 13371556Srgrimes q->next = NULL; /* terminate first half of list */ 13381556Srgrimes q = msort(list, half); /* sort first half of list */ 13391556Srgrimes p = msort(p, len - half); /* sort second half */ 13401556Srgrimes lpp = &list; 13411556Srgrimes for (;;) { 13421556Srgrimes if (strcmp(p->text, q->text) < 0) { 13431556Srgrimes *lpp = p; 13441556Srgrimes lpp = &p->next; 13451556Srgrimes if ((p = *lpp) == NULL) { 13461556Srgrimes *lpp = q; 13471556Srgrimes break; 13481556Srgrimes } 13491556Srgrimes } else { 13501556Srgrimes *lpp = q; 13511556Srgrimes lpp = &q->next; 13521556Srgrimes if ((q = *lpp) == NULL) { 13531556Srgrimes *lpp = p; 13541556Srgrimes break; 13551556Srgrimes } 13561556Srgrimes } 13571556Srgrimes } 13581556Srgrimes return list; 13591556Srgrimes} 13601556Srgrimes 13611556Srgrimes 13621556Srgrimes 13631556Srgrimes/* 13641556Srgrimes * Returns true if the pattern matches the string. 13651556Srgrimes */ 13661556Srgrimes 13671556Srgrimesint 1368200956Sjillespatmatch(const char *pattern, const char *string, int squoted) 136990111Simp{ 1370200956Sjilles const char *p, *q; 137125233Ssteve char c; 13721556Srgrimes 13731556Srgrimes p = pattern; 13741556Srgrimes q = string; 13751556Srgrimes for (;;) { 13761556Srgrimes switch (c = *p++) { 13771556Srgrimes case '\0': 13781556Srgrimes goto breakloop; 13791556Srgrimes case CTLESC: 138045514Stegge if (squoted && *q == CTLESC) 138145514Stegge q++; 13821556Srgrimes if (*q++ != *p++) 13831556Srgrimes return 0; 13841556Srgrimes break; 138538887Stegge case CTLQUOTEMARK: 138638887Stegge continue; 13871556Srgrimes case '?': 138845514Stegge if (squoted && *q == CTLESC) 138945514Stegge q++; 13901556Srgrimes if (*q++ == '\0') 13911556Srgrimes return 0; 13921556Srgrimes break; 13931556Srgrimes case '*': 13941556Srgrimes c = *p; 139538887Stegge while (c == CTLQUOTEMARK || c == '*') 139638887Stegge c = *++p; 139738887Stegge if (c != CTLESC && c != CTLQUOTEMARK && 139838887Stegge c != '?' && c != '*' && c != '[') { 13991556Srgrimes while (*q != c) { 140045514Stegge if (squoted && *q == CTLESC && 140145514Stegge q[1] == c) 140245514Stegge break; 14031556Srgrimes if (*q == '\0') 14041556Srgrimes return 0; 140545514Stegge if (squoted && *q == CTLESC) 140645514Stegge q++; 14071556Srgrimes q++; 14081556Srgrimes } 14091556Srgrimes } 14101556Srgrimes do { 1411211646Sjilles if (patmatch(p, q, squoted)) 14121556Srgrimes return 1; 141345514Stegge if (squoted && *q == CTLESC) 141445514Stegge q++; 14151556Srgrimes } while (*q++ != '\0'); 14161556Srgrimes return 0; 14171556Srgrimes case '[': { 1418200956Sjilles const char *endp; 14191556Srgrimes int invert, found; 14201556Srgrimes char chr; 14211556Srgrimes 14221556Srgrimes endp = p; 142326488Sache if (*endp == '!' || *endp == '^') 14241556Srgrimes endp++; 14251556Srgrimes for (;;) { 142638887Stegge while (*endp == CTLQUOTEMARK) 142738887Stegge endp++; 14281556Srgrimes if (*endp == '\0') 14291556Srgrimes goto dft; /* no matching ] */ 14301556Srgrimes if (*endp == CTLESC) 14311556Srgrimes endp++; 14321556Srgrimes if (*++endp == ']') 14331556Srgrimes break; 14341556Srgrimes } 14351556Srgrimes invert = 0; 143626488Sache if (*p == '!' || *p == '^') { 14371556Srgrimes invert++; 14381556Srgrimes p++; 14391556Srgrimes } 14401556Srgrimes found = 0; 14411556Srgrimes chr = *q++; 144245514Stegge if (squoted && chr == CTLESC) 144345514Stegge chr = *q++; 144417987Speter if (chr == '\0') 144517987Speter return 0; 14461556Srgrimes c = *p++; 14471556Srgrimes do { 144838887Stegge if (c == CTLQUOTEMARK) 144938887Stegge continue; 14501556Srgrimes if (c == CTLESC) 14511556Srgrimes c = *p++; 14521556Srgrimes if (*p == '-' && p[1] != ']') { 14531556Srgrimes p++; 145438887Stegge while (*p == CTLQUOTEMARK) 145538887Stegge p++; 14561556Srgrimes if (*p == CTLESC) 14571556Srgrimes p++; 145817557Sache if ( collate_range_cmp(chr, c) >= 0 145917557Sache && collate_range_cmp(chr, *p) <= 0 146017525Sache ) 14611556Srgrimes found = 1; 14621556Srgrimes p++; 14631556Srgrimes } else { 14641556Srgrimes if (chr == c) 14651556Srgrimes found = 1; 14661556Srgrimes } 14671556Srgrimes } while ((c = *p++) != ']'); 14681556Srgrimes if (found == invert) 14691556Srgrimes return 0; 14701556Srgrimes break; 14711556Srgrimes } 14721556Srgrimesdft: default: 147345514Stegge if (squoted && *q == CTLESC) 147445514Stegge q++; 14751556Srgrimes if (*q++ != c) 14761556Srgrimes return 0; 14771556Srgrimes break; 14781556Srgrimes } 14791556Srgrimes } 14801556Srgrimesbreakloop: 14811556Srgrimes if (*q != '\0') 14821556Srgrimes return 0; 14831556Srgrimes return 1; 14841556Srgrimes} 14851556Srgrimes 14861556Srgrimes 14871556Srgrimes 14881556Srgrimes/* 1489212243Sjilles * Remove any CTLESC and CTLQUOTEMARK characters from a string. 14901556Srgrimes */ 14911556Srgrimes 14921556Srgrimesvoid 149390111Simprmescapes(char *str) 149438887Stegge{ 149525233Ssteve char *p, *q; 14961556Srgrimes 14971556Srgrimes p = str; 149838887Stegge while (*p != CTLESC && *p != CTLQUOTEMARK) { 14991556Srgrimes if (*p++ == '\0') 15001556Srgrimes return; 15011556Srgrimes } 15021556Srgrimes q = p; 15031556Srgrimes while (*p) { 150438887Stegge if (*p == CTLQUOTEMARK) { 150538887Stegge p++; 150638887Stegge continue; 150738887Stegge } 15081556Srgrimes if (*p == CTLESC) 15091556Srgrimes p++; 15101556Srgrimes *q++ = *p++; 15111556Srgrimes } 15121556Srgrimes *q = '\0'; 15131556Srgrimes} 15141556Srgrimes 15151556Srgrimes 15161556Srgrimes 15171556Srgrimes/* 15181556Srgrimes * See if a pattern matches in a case statement. 15191556Srgrimes */ 15201556Srgrimes 15211556Srgrimesint 1522200956Sjillescasematch(union node *pattern, const char *val) 152390111Simp{ 15241556Srgrimes struct stackmark smark; 15251556Srgrimes int result; 15261556Srgrimes char *p; 15271556Srgrimes 15281556Srgrimes setstackmark(&smark); 15291556Srgrimes argbackq = pattern->narg.backquote; 15301556Srgrimes STARTSTACKSTR(expdest); 15311556Srgrimes ifslastp = NULL; 15321556Srgrimes argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); 15331556Srgrimes STPUTC('\0', expdest); 15341556Srgrimes p = grabstackstr(expdest); 153545514Stegge result = patmatch(p, val, 0); 15361556Srgrimes popstackmark(&smark); 15371556Srgrimes return result; 15381556Srgrimes} 153917987Speter 154017987Speter/* 154117987Speter * Our own itoa(). 154217987Speter */ 154317987Speter 154417987SpeterSTATIC char * 154590111Simpcvtnum(int num, char *buf) 154690111Simp{ 154717987Speter char temp[32]; 154817987Speter int neg = num < 0; 154917987Speter char *p = temp + 31; 155017987Speter 155117987Speter temp[31] = '\0'; 155217987Speter 155317987Speter do { 155417987Speter *--p = num % 10 + '0'; 155517987Speter } while ((num /= 10) != 0); 155617987Speter 155717987Speter if (neg) 155817987Speter *--p = '-'; 155917987Speter 156017987Speter while (*p) 156117987Speter STPUTC(*p++, buf); 156217987Speter return buf; 156317987Speter} 1564108286Stjr 1565108286Stjr/* 1566108286Stjr * Do most of the work for wordexp(3). 1567108286Stjr */ 1568108286Stjr 1569108286Stjrint 1570108286Stjrwordexpcmd(int argc, char **argv) 1571108286Stjr{ 1572108286Stjr size_t len; 1573108286Stjr int i; 1574108286Stjr 1575108286Stjr out1fmt("%08x", argc - 1); 1576108286Stjr for (i = 1, len = 0; i < argc; i++) 1577108286Stjr len += strlen(argv[i]); 1578108286Stjr out1fmt("%08x", (int)len); 1579108286Stjr for (i = 1; i < argc; i++) { 1580108286Stjr out1str(argv[i]); 1581108286Stjr out1c('\0'); 1582108286Stjr } 1583108286Stjr return (0); 1584108286Stjr} 1585