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Diffstat (limited to 'bin/catsh/expand.c')
| -rw-r--r-- | bin/catsh/expand.c | 1552 |
1 files changed, 0 insertions, 1552 deletions
diff --git a/bin/catsh/expand.c b/bin/catsh/expand.c deleted file mode 100644 index 7c419b80..00000000 --- a/bin/catsh/expand.c +++ /dev/null @@ -1,1552 +0,0 @@ -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * Copyright (c) 1997-2005 - * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. - * Copyright (c) 2010-2015 - * Jilles Tjoelker <jilles@stack.nl>. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Kenneth Almquist. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95"; -#endif -#endif /* not lint */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD: releng/12.0/bin/sh/expand.c 338473 2018-09-05 19:16:09Z jilles $"); - -#include <sys/types.h> -#include <sys/time.h> -#include <sys/stat.h> -#include <dirent.h> -#include <errno.h> -#include <inttypes.h> -#include <limits.h> -#include <pwd.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <wchar.h> -#include <wctype.h> - -/* - * Routines to expand arguments to commands. We have to deal with - * backquotes, shell variables, and file metacharacters. - */ - -#include "shell.h" -#include "main.h" -#include "nodes.h" -#include "eval.h" -#include "expand.h" -#include "syntax.h" -#include "parser.h" -#include "jobs.h" -#include "options.h" -#include "var.h" -#include "input.h" -#include "output.h" -#include "memalloc.h" -#include "error.h" -#include "mystring.h" -#include "arith.h" -#include "show.h" -#include "builtins.h" - -enum wordstate { WORD_IDLE, WORD_WS_DELIMITED, WORD_QUOTEMARK }; - -struct worddest { - struct arglist *list; - enum wordstate state; -}; - -static char *expdest; /* output of current string */ - -static const char *argstr(const char *, struct nodelist **restrict, int, - struct worddest *); -static const char *exptilde(const char *, int); -static const char *expari(const char *, struct nodelist **restrict, int, - struct worddest *); -static void expbackq(union node *, int, int, struct worddest *); -static const char *subevalvar_trim(const char *, struct nodelist **restrict, - int, int, int); -static const char *subevalvar_misc(const char *, struct nodelist **restrict, - const char *, int, int, int); -static const char *evalvar(const char *, struct nodelist **restrict, int, - struct worddest *); -static int varisset(const char *, int); -static void strtodest(const char *, int, int, int, struct worddest *); -static void reprocess(int, int, int, int, struct worddest *); -static void varvalue(const char *, int, int, int, struct worddest *); -static void expandmeta(char *, struct arglist *); -static void expmeta(char *, char *, struct arglist *); -static int expsortcmp(const void *, const void *); -static int patmatch(const char *, const char *); -static void cvtnum(int, char *); -static int collate_range_cmp(wchar_t, wchar_t); - -void -emptyarglist(struct arglist *list) -{ - - list->args = list->smallarg; - list->count = 0; - list->capacity = sizeof(list->smallarg) / sizeof(list->smallarg[0]); -} - -void -appendarglist(struct arglist *list, char *str) -{ - char **newargs; - int newcapacity; - - if (list->count >= list->capacity) { - newcapacity = list->capacity * 2; - if (newcapacity < 16) - newcapacity = 16; - if (newcapacity > INT_MAX / (int)sizeof(newargs[0])) - error("Too many entries in arglist"); - newargs = stalloc(newcapacity * sizeof(newargs[0])); - memcpy(newargs, list->args, list->count * sizeof(newargs[0])); - list->args = newargs; - list->capacity = newcapacity; - } - list->args[list->count++] = str; -} - -static int -collate_range_cmp(wchar_t c1, wchar_t c2) -{ - wchar_t s1[2], s2[2]; - - s1[0] = c1; - s1[1] = L'\0'; - s2[0] = c2; - s2[1] = L'\0'; - return (wcscoll(s1, s2)); -} - -static char * -stputs_quotes(const char *data, const char *syntax, char *p) -{ - while (*data) { - CHECKSTRSPACE(2, p); - if (syntax[(int)*data] == CCTL) - USTPUTC(CTLESC, p); - USTPUTC(*data++, p); - } - return (p); -} -#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p) - -static char * -nextword(char c, int flag, char *p, struct worddest *dst) -{ - int is_ws; - - is_ws = c == '\t' || c == '\n' || c == ' '; - if (p != stackblock() || (is_ws ? dst->state == WORD_QUOTEMARK : - dst->state != WORD_WS_DELIMITED) || c == '\0') { - STPUTC('\0', p); - if (flag & EXP_GLOB) - expandmeta(grabstackstr(p), dst->list); - else - appendarglist(dst->list, grabstackstr(p)); - dst->state = is_ws ? WORD_WS_DELIMITED : WORD_IDLE; - } else if (!is_ws && dst->state == WORD_WS_DELIMITED) - dst->state = WORD_IDLE; - /* Reserve space while the stack string is empty. */ - appendarglist(dst->list, NULL); - dst->list->count--; - STARTSTACKSTR(p); - return p; -} -#define NEXTWORD(c, flag, p, dstlist) p = nextword(c, flag, p, dstlist) - -static char * -stputs_split(const char *data, const char *syntax, int flag, char *p, - struct worddest *dst) -{ - const char *ifs; - char c; - - ifs = ifsset() ? ifsval() : " \t\n"; - while (*data) { - CHECKSTRSPACE(2, p); - c = *data++; - if (strchr(ifs, c) != NULL) { - NEXTWORD(c, flag, p, dst); - continue; - } - if (flag & EXP_GLOB && syntax[(int)c] == CCTL) - USTPUTC(CTLESC, p); - USTPUTC(c, p); - } - return (p); -} -#define STPUTS_SPLIT(data, syntax, flag, p, dst) p = stputs_split((data), syntax, flag, p, dst) - -/* - * Perform expansions on an argument, placing the resulting list of arguments - * in arglist. Parameter expansion, command substitution and arithmetic - * expansion are always performed; additional expansions can be requested - * via flag (EXP_*). - * The result is left in the stack string. - * When arglist is NULL, perform here document expansion. - * - * When doing something that may cause this to be re-entered, make sure - * the stack string is empty via grabstackstr() and do not assume expdest - * remains valid. - */ -void -expandarg(union node *arg, struct arglist *arglist, int flag) -{ - struct worddest exparg; - struct nodelist *argbackq; - - if (fflag) - flag &= ~EXP_GLOB; - argbackq = arg->narg.backquote; - exparg.list = arglist; - exparg.state = WORD_IDLE; - STARTSTACKSTR(expdest); - argstr(arg->narg.text, &argbackq, flag, &exparg); - if (arglist == NULL) { - STACKSTRNUL(expdest); - return; /* here document expanded */ - } - if ((flag & EXP_SPLIT) == 0 || expdest != stackblock() || - exparg.state == WORD_QUOTEMARK) { - STPUTC('\0', expdest); - if (flag & EXP_SPLIT) { - if (flag & EXP_GLOB) - expandmeta(grabstackstr(expdest), exparg.list); - else - appendarglist(exparg.list, grabstackstr(expdest)); - } - } - if ((flag & EXP_SPLIT) == 0) - appendarglist(arglist, grabstackstr(expdest)); -} - - - -/* - * Perform parameter expansion, command substitution and arithmetic - * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. - * Processing ends at a CTLENDVAR or CTLENDARI character as well as '\0'. - * This is used to expand word in ${var+word} etc. - * If EXP_GLOB or EXP_CASE are set, keep and/or generate CTLESC - * characters to allow for further processing. - * - * If EXP_SPLIT is set, dst receives any complete words produced. - */ -static const char * -argstr(const char *p, struct nodelist **restrict argbackq, int flag, - struct worddest *dst) -{ - char c; - int quotes = flag & (EXP_GLOB | EXP_CASE); /* do CTLESC */ - int firsteq = 1; - int split_lit; - int lit_quoted; - - split_lit = flag & EXP_SPLIT_LIT; - lit_quoted = flag & EXP_LIT_QUOTED; - flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); - if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) - p = exptilde(p, flag); - for (;;) { - CHECKSTRSPACE(2, expdest); - switch (c = *p++) { - case '\0': - return (p - 1); - case CTLENDVAR: - case CTLENDARI: - return (p); - case CTLQUOTEMARK: - lit_quoted = 1; - /* "$@" syntax adherence hack */ - if (p[0] == CTLVAR && (p[1] & VSQUOTE) != 0 && - p[2] == '@' && p[3] == '=') - break; - if ((flag & EXP_SPLIT) != 0 && expdest == stackblock()) - dst->state = WORD_QUOTEMARK; - break; - case CTLQUOTEEND: - lit_quoted = 0; - break; - case CTLESC: - c = *p++; - if (split_lit && !lit_quoted && - strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { - NEXTWORD(c, flag, expdest, dst); - break; - } - if (quotes) - USTPUTC(CTLESC, expdest); - USTPUTC(c, expdest); - break; - case CTLVAR: - p = evalvar(p, argbackq, flag, dst); - break; - case CTLBACKQ: - case CTLBACKQ|CTLQUOTE: - expbackq((*argbackq)->n, c & CTLQUOTE, flag, dst); - *argbackq = (*argbackq)->next; - break; - case CTLARI: - p = expari(p, argbackq, flag, dst); - break; - case ':': - case '=': - /* - * sort of a hack - expand tildes in variable - * assignments (after the first '=' and after ':'s). - */ - if (split_lit && !lit_quoted && - strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { - NEXTWORD(c, flag, expdest, dst); - break; - } - USTPUTC(c, expdest); - if (flag & EXP_VARTILDE && *p == '~' && - (c != '=' || firsteq)) { - if (c == '=') - firsteq = 0; - p = exptilde(p, flag); - } - break; - default: - if (split_lit && !lit_quoted && - strchr(ifsset() ? ifsval() : " \t\n", c) != NULL) { - NEXTWORD(c, flag, expdest, dst); - break; - } - USTPUTC(c, expdest); - } - } -} - -/* - * Perform tilde expansion, placing the result in the stack string and - * returning the next position in the input string to process. - */ -static const char * -exptilde(const char *p, int flag) -{ - char c; - const char *startp = p; - const char *user; - struct passwd *pw; - char *home; - int len; - - for (;;) { - c = *p; - switch(c) { - case CTLESC: /* This means CTL* are always considered quoted. */ - case CTLVAR: - case CTLBACKQ: - case CTLBACKQ | CTLQUOTE: - case CTLARI: - case CTLENDARI: - case CTLQUOTEMARK: - return (startp); - case ':': - if ((flag & EXP_VARTILDE) == 0) - break; - /* FALLTHROUGH */ - case '\0': - case '/': - case CTLENDVAR: - len = p - startp - 1; - STPUTBIN(startp + 1, len, expdest); - STACKSTRNUL(expdest); - user = expdest - len; - if (*user == '\0') { - home = lookupvar("HOME"); - } else { - pw = getpwnam(user); - home = pw != NULL ? pw->pw_dir : NULL; - } - STADJUST(-len, expdest); - if (home == NULL || *home == '\0') - return (startp); - strtodest(home, flag, VSNORMAL, 1, NULL); - return (p); - } - p++; - } -} - - -/* - * Expand arithmetic expression. - */ -static const char * -expari(const char *p, struct nodelist **restrict argbackq, int flag, - struct worddest *dst) -{ - char *q, *start; - arith_t result; - int begoff; - int quoted; - int adj; - - quoted = *p++ == '"'; - begoff = expdest - stackblock(); - p = argstr(p, argbackq, 0, NULL); - STPUTC('\0', expdest); - start = stackblock() + begoff; - - q = grabstackstr(expdest); - result = arith(start); - ungrabstackstr(q, expdest); - - start = stackblock() + begoff; - adj = start - expdest; - STADJUST(adj, expdest); - - CHECKSTRSPACE((int)(DIGITS(result) + 1), expdest); - fmtstr(expdest, DIGITS(result), ARITH_FORMAT_STR, result); - adj = strlen(expdest); - STADJUST(adj, expdest); - /* - * If this is quoted, a '-' must not indicate a range in [...]. - * If this is not quoted, splitting may occur. - */ - if (quoted ? - result < 0 && begoff > 1 && flag & (EXP_GLOB | EXP_CASE) : - flag & EXP_SPLIT) - reprocess(expdest - adj - stackblock(), flag, VSNORMAL, quoted, - dst); - return p; -} - - -/* - * Perform command substitution. - */ -static void -expbackq(union node *cmd, int quoted, int flag, struct worddest *dst) -{ - struct backcmd in; - int i; - char buf[128]; - char *p; - char *dest = expdest; - char lastc; - char const *syntax = quoted? DQSYNTAX : BASESYNTAX; - int quotes = flag & (EXP_GLOB | EXP_CASE); - size_t nnl; - const char *ifs; - int startloc; - - INTOFF; - p = grabstackstr(dest); - evalbackcmd(cmd, &in); - ungrabstackstr(p, dest); - - p = in.buf; - startloc = dest - stackblock(); - nnl = 0; - if (!quoted && flag & EXP_SPLIT) - ifs = ifsset() ? ifsval() : " \t\n"; - else - ifs = ""; - /* Remove trailing newlines */ - for (;;) { - if (--in.nleft < 0) { - if (in.fd < 0) - break; - while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR) - ; - TRACE(("expbackq: read returns %d\n", i)); - if (i <= 0) - break; - p = buf; - in.nleft = i - 1; - } - lastc = *p++; - if (lastc == '\0') - continue; - if (nnl > 0 && lastc != '\n') { - NEXTWORD('\n', flag, dest, dst); - nnl = 0; - } - if (strchr(ifs, lastc) != NULL) { - if (lastc == '\n') - nnl++; - else - NEXTWORD(lastc, flag, dest, dst); - } else { - CHECKSTRSPACE(2, dest); - if (quotes && syntax[(int)lastc] == CCTL) - USTPUTC(CTLESC, dest); - USTPUTC(lastc, dest); - } - } - while (dest > stackblock() + startloc && STTOPC(dest) == '\n') - STUNPUTC(dest); - - if (in.fd >= 0) - close(in.fd); - if (in.buf) - ckfree(in.buf); - if (in.jp) { - p = grabstackstr(dest); - exitstatus = waitforjob(in.jp, (int *)NULL); - ungrabstackstr(p, dest); - } - TRACE(("expbackq: done\n")); - expdest = dest; - INTON; -} - - - -static void -recordleft(const char *str, const char *loc, char *startp) -{ - int amount; - - amount = ((str - 1) - (loc - startp)) - expdest; - STADJUST(amount, expdest); - while (loc != str - 1) - *startp++ = *loc++; -} - -static const char * -subevalvar_trim(const char *p, struct nodelist **restrict argbackq, int strloc, - int subtype, int startloc) -{ - char *startp; - char *loc = NULL; - char *str; - int c = 0; - int amount; - - p = argstr(p, argbackq, EXP_CASE | EXP_TILDE, NULL); - STACKSTRNUL(expdest); - startp = stackblock() + startloc; - str = stackblock() + strloc; - - switch (subtype) { - case VSTRIMLEFT: - for (loc = startp; loc < str; loc++) { - c = *loc; - *loc = '\0'; - if (patmatch(str, startp)) { - *loc = c; - recordleft(str, loc, startp); - return p; - } - *loc = c; - } - break; - - case VSTRIMLEFTMAX: - for (loc = str - 1; loc >= startp;) { - c = *loc; - *loc = '\0'; - if (patmatch(str, startp)) { - *loc = c; - recordleft(str, loc, startp); - return p; - } - *loc = c; - loc--; - } - break; - - case VSTRIMRIGHT: - for (loc = str - 1; loc >= startp;) { - if (patmatch(str, loc)) { - amount = loc - expdest; - STADJUST(amount, expdest); - return p; - } - loc--; - } - break; - - case VSTRIMRIGHTMAX: - for (loc = startp; loc < str - 1; loc++) { - if (patmatch(str, loc)) { - amount = loc - expdest; - STADJUST(amount, expdest); - return p; - } - } - break; - - - default: - abort(); - } - amount = (expdest - stackblock() - strloc) + 1; - STADJUST(-amount, expdest); - return p; -} - - -static const char * -subevalvar_misc(const char *p, struct nodelist **restrict argbackq, - const char *var, int subtype, int startloc, int varflags) -{ - char *startp; - int amount; - - p = argstr(p, argbackq, EXP_TILDE, NULL); - STACKSTRNUL(expdest); - startp = stackblock() + startloc; - - switch (subtype) { - case VSASSIGN: - setvar(var, startp, 0); - amount = startp - expdest; - STADJUST(amount, expdest); - return p; - - case VSQUESTION: - if (*p != CTLENDVAR) { - outfmt(out2, "%s\n", startp); - error((char *)NULL); - } - error("%.*s: parameter %snot set", (int)(p - var - 1), - var, (varflags & VSNUL) ? "null or " : ""); - - default: - abort(); - } -} - - -/* - * Expand a variable, and return a pointer to the next character in the - * input string. - */ - -static const char * -evalvar(const char *p, struct nodelist **restrict argbackq, int flag, - struct worddest *dst) -{ - int subtype; - int varflags; - const char *var; - const char *val; - int patloc; - int c; - int set; - int special; - int startloc; - int varlen; - int varlenb; - char buf[21]; - - varflags = (unsigned char)*p++; - subtype = varflags & VSTYPE; - var = p; - special = 0; - if (! is_name(*p)) - special = 1; - p = strchr(p, '=') + 1; - if (varflags & VSLINENO) { - set = 1; - special = 1; - val = NULL; - } else if (special) { - set = varisset(var, varflags & VSNUL); - val = NULL; - } else { - val = bltinlookup(var, 1); - if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) { - val = NULL; - set = 0; - } else - set = 1; - } - varlen = 0; - startloc = expdest - stackblock(); - if (!set && uflag && *var != '@' && *var != '*') { - switch (subtype) { - case VSNORMAL: - case VSTRIMLEFT: - case VSTRIMLEFTMAX: - case VSTRIMRIGHT: - case VSTRIMRIGHTMAX: - case VSLENGTH: - error("%.*s: parameter not set", (int)(p - var - 1), - var); - } - } - if (set && subtype != VSPLUS) { - /* insert the value of the variable */ - if (special) { - if (varflags & VSLINENO) { - if (p - var > (ptrdiff_t)sizeof(buf)) - abort(); - memcpy(buf, var, p - var - 1); - buf[p - var - 1] = '\0'; - strtodest(buf, flag, subtype, - varflags & VSQUOTE, dst); - } else - varvalue(var, varflags & VSQUOTE, subtype, flag, - dst); - if (subtype == VSLENGTH) { - varlenb = expdest - stackblock() - startloc; - varlen = varlenb; - if (localeisutf8) { - val = stackblock() + startloc; - for (;val != expdest; val++) - if ((*val & 0xC0) == 0x80) - varlen--; - } - STADJUST(-varlenb, expdest); - } - } else { - if (subtype == VSLENGTH) { - for (;*val; val++) - if (!localeisutf8 || - (*val & 0xC0) != 0x80) - varlen++; - } - else - strtodest(val, flag, subtype, - varflags & VSQUOTE, dst); - } - } - - if (subtype == VSPLUS) - set = ! set; - - switch (subtype) { - case VSLENGTH: - cvtnum(varlen, buf); - strtodest(buf, flag, VSNORMAL, varflags & VSQUOTE, dst); - break; - - case VSNORMAL: - return p; - - case VSPLUS: - case VSMINUS: - if (!set) { - return argstr(p, argbackq, - flag | (flag & EXP_SPLIT ? EXP_SPLIT_LIT : 0) | - (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0), dst); - } - break; - - case VSTRIMLEFT: - case VSTRIMLEFTMAX: - case VSTRIMRIGHT: - case VSTRIMRIGHTMAX: - if (!set) - break; - /* - * Terminate the string and start recording the pattern - * right after it - */ - STPUTC('\0', expdest); - patloc = expdest - stackblock(); - p = subevalvar_trim(p, argbackq, patloc, subtype, startloc); - reprocess(startloc, flag, VSNORMAL, varflags & VSQUOTE, dst); - if (flag & EXP_SPLIT && *var == '@' && varflags & VSQUOTE) - dst->state = WORD_QUOTEMARK; - return p; - - case VSASSIGN: - case VSQUESTION: - if (!set) { - p = subevalvar_misc(p, argbackq, var, subtype, - startloc, varflags); - /* assert(subtype == VSASSIGN); */ - val = lookupvar(var); - strtodest(val, flag, subtype, varflags & VSQUOTE, dst); - return p; - } - break; - - case VSERROR: - c = p - var - 1; - error("${%.*s%s}: Bad substitution", c, var, - (c > 0 && *p != CTLENDVAR) ? "..." : ""); - - default: - abort(); - } - - { /* skip to end of alternative */ - int nesting = 1; - for (;;) { - if ((c = *p++) == CTLESC) - p++; - else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) - *argbackq = (*argbackq)->next; - else if (c == CTLVAR) { - if ((*p++ & VSTYPE) != VSNORMAL) - nesting++; - } else if (c == CTLENDVAR) { - if (--nesting == 0) - break; - } - } - } - return p; -} - - - -/* - * Test whether a special or positional parameter is set. - */ - -static int -varisset(const char *name, int nulok) -{ - - if (*name == '!') - return backgndpidset(); - else if (*name == '@' || *name == '*') { - if (*shellparam.p == NULL) - return 0; - - if (nulok) { - char **av; - - for (av = shellparam.p; *av; av++) - if (**av != '\0') - return 1; - return 0; - } - } else if (is_digit(*name)) { - char *ap; - long num; - - errno = 0; - num = strtol(name, NULL, 10); - if (errno != 0 || num > shellparam.nparam) - return 0; - - if (num == 0) - ap = arg0; - else - ap = shellparam.p[num - 1]; - - if (nulok && (ap == NULL || *ap == '\0')) - return 0; - } - return 1; -} - -static void -strtodest(const char *p, int flag, int subtype, int quoted, - struct worddest *dst) -{ - if (subtype == VSLENGTH || subtype == VSTRIMLEFT || - subtype == VSTRIMLEFTMAX || subtype == VSTRIMRIGHT || - subtype == VSTRIMRIGHTMAX) - STPUTS(p, expdest); - else if (flag & EXP_SPLIT && !quoted && dst != NULL) - STPUTS_SPLIT(p, BASESYNTAX, flag, expdest, dst); - else if (flag & (EXP_GLOB | EXP_CASE)) - STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); - else - STPUTS(p, expdest); -} - -static void -reprocess(int startloc, int flag, int subtype, int quoted, - struct worddest *dst) -{ - static char *buf = NULL; - static size_t buflen = 0; - char *startp; - size_t len, zpos, zlen; - - startp = stackblock() + startloc; - len = expdest - startp; - if (len >= SIZE_MAX / 2 || len > PTRDIFF_MAX) - abort(); - INTOFF; - if (len >= buflen) { - ckfree(buf); - buf = NULL; - } - if (buflen < 128) - buflen = 128; - while (len >= buflen) - buflen <<= 1; - if (buf == NULL) - buf = ckmalloc(buflen); - INTON; - memcpy(buf, startp, len); - buf[len] = '\0'; - STADJUST(-(ptrdiff_t)len, expdest); - for (zpos = 0;;) { - zlen = strlen(buf + zpos); - strtodest(buf + zpos, flag, subtype, quoted, dst); - zpos += zlen + 1; - if (zpos == len + 1) - break; - if (flag & EXP_SPLIT && (quoted || (zlen > 0 && zpos < len))) - NEXTWORD('\0', flag, expdest, dst); - } -} - -/* - * Add the value of a special or positional parameter to the stack string. - */ - -static void -varvalue(const char *name, int quoted, int subtype, int flag, - struct worddest *dst) -{ - int num; - char *p; - int i; - int splitlater; - char sep[2]; - char **ap; - char buf[(NSHORTOPTS > 10 ? NSHORTOPTS : 10) + 1]; - - if (subtype == VSLENGTH) - flag &= ~EXP_FULL; - splitlater = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || - subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX; - - switch (*name) { - case '$': - num = rootpid; - break; - case '?': - num = oexitstatus; - break; - case '#': - num = shellparam.nparam; - break; - case '!': - num = backgndpidval(); - break; - case '-': - p = buf; - for (i = 0 ; i < NSHORTOPTS ; i++) { - if (optval[i]) - *p++ = optletter[i]; - } - *p = '\0'; - strtodest(buf, flag, subtype, quoted, dst); - return; - case '@': - if (flag & EXP_SPLIT && quoted) { - for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { - strtodest(p, flag, subtype, quoted, dst); - if (*ap) { - if (splitlater) - STPUTC('\0', expdest); - else - NEXTWORD('\0', flag, expdest, - dst); - } - } - if (shellparam.nparam > 0) - dst->state = WORD_QUOTEMARK; - return; - } - /* FALLTHROUGH */ - case '*': - if (ifsset()) - sep[0] = ifsval()[0]; - else - sep[0] = ' '; - sep[1] = '\0'; - for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { - strtodest(p, flag, subtype, quoted, dst); - if (!*ap) - break; - if (sep[0]) - strtodest(sep, flag, subtype, quoted, dst); - else if (flag & EXP_SPLIT && !quoted && **ap != '\0') { - if (splitlater) - STPUTC('\0', expdest); - else - NEXTWORD('\0', flag, expdest, dst); - } - } - return; - default: - if (is_digit(*name)) { - num = atoi(name); - if (num == 0) - p = arg0; - else if (num > 0 && num <= shellparam.nparam) - p = shellparam.p[num - 1]; - else - return; - strtodest(p, flag, subtype, quoted, dst); - } - return; - } - cvtnum(num, buf); - strtodest(buf, flag, subtype, quoted, dst); -} - - - -static char expdir[PATH_MAX]; -#define expdir_end (expdir + sizeof(expdir)) - -/* - * Perform pathname generation and remove control characters. - * At this point, the only control characters should be CTLESC. - * The results are stored in the list dstlist. - */ -static void -expandmeta(char *pattern, struct arglist *dstlist) -{ - char *p; - int firstmatch; - char c; - - firstmatch = dstlist->count; - p = pattern; - for (; (c = *p) != '\0'; p++) { - /* fast check for meta chars */ - if (c == '*' || c == '?' || c == '[') { - INTOFF; - expmeta(expdir, pattern, dstlist); - INTON; - break; - } - } - if (dstlist->count == firstmatch) { - /* - * no matches - */ - rmescapes(pattern); - appendarglist(dstlist, pattern); - } else { - qsort(&dstlist->args[firstmatch], - dstlist->count - firstmatch, - sizeof(dstlist->args[0]), expsortcmp); - } -} - - -/* - * Do metacharacter (i.e. *, ?, [...]) expansion. - */ - -static void -expmeta(char *enddir, char *name, struct arglist *arglist) -{ - const char *p; - const char *q; - const char *start; - char *endname; - int metaflag; - struct stat statb; - DIR *dirp; - struct dirent *dp; - int atend; - int matchdot; - int esc; - int namlen; - - metaflag = 0; - start = name; - for (p = name; esc = 0, *p; p += esc + 1) { - if (*p == '*' || *p == '?') - metaflag = 1; - else if (*p == '[') { - q = p + 1; - if (*q == '!' || *q == '^') - q++; - for (;;) { - if (*q == CTLESC) - q++; - if (*q == '/' || *q == '\0') - break; - if (*++q == ']') { - metaflag = 1; - break; - } - } - } else if (*p == '\0') - break; - else { - if (*p == CTLESC) - esc++; - if (p[esc] == '/') { - if (metaflag) - break; - start = p + esc + 1; - } - } - } - if (metaflag == 0) { /* we've reached the end of the file name */ - if (enddir != expdir) - metaflag++; - for (p = name ; ; p++) { - if (*p == CTLESC) - p++; - *enddir++ = *p; - if (*p == '\0') - break; - if (enddir == expdir_end) - return; - } - if (metaflag == 0 || lstat(expdir, &statb) >= 0) - appendarglist(arglist, stsavestr(expdir)); - return; - } - endname = name + (p - name); - if (start != name) { - p = name; - while (p < start) { - if (*p == CTLESC) - p++; - *enddir++ = *p++; - if (enddir == expdir_end) - return; - } - } - if (enddir == expdir) { - p = "."; - } else if (enddir == expdir + 1 && *expdir == '/') { - p = "/"; - } else { - p = expdir; - enddir[-1] = '\0'; - } - if ((dirp = opendir(p)) == NULL) - return; - if (enddir != expdir) - enddir[-1] = '/'; - if (*endname == 0) { - atend = 1; - } else { - atend = 0; - *endname = '\0'; - endname += esc + 1; - } - matchdot = 0; - p = start; - if (*p == CTLESC) - p++; - if (*p == '.') - matchdot++; - while (! int_pending() && (dp = readdir(dirp)) != NULL) { - if (dp->d_name[0] == '.' && ! matchdot) - continue; - if (patmatch(start, dp->d_name)) { - namlen = dp->d_namlen; - if (enddir + namlen + 1 > expdir_end) - continue; - memcpy(enddir, dp->d_name, namlen + 1); - if (atend) - appendarglist(arglist, stsavestr(expdir)); - else { - if (dp->d_type != DT_UNKNOWN && - dp->d_type != DT_DIR && - dp->d_type != DT_LNK) - continue; - if (enddir + namlen + 2 > expdir_end) - continue; - enddir[namlen] = '/'; - enddir[namlen + 1] = '\0'; - expmeta(enddir + namlen + 1, endname, arglist); - } - } - } - closedir(dirp); - if (! atend) - endname[-esc - 1] = esc ? CTLESC : '/'; -} - - -static int -expsortcmp(const void *p1, const void *p2) -{ - const char *s1 = *(const char * const *)p1; - const char *s2 = *(const char * const *)p2; - - return (strcoll(s1, s2)); -} - - - -static wchar_t -get_wc(const char **p) -{ - wchar_t c; - int chrlen; - - chrlen = mbtowc(&c, *p, 4); - if (chrlen == 0) - return 0; - else if (chrlen == -1) - c = 0; - else - *p += chrlen; - return c; -} - - -/* - * See if a character matches a character class, starting at the first colon - * of "[:class:]". - * If a valid character class is recognized, a pointer to the next character - * after the final closing bracket is stored into *end, otherwise a null - * pointer is stored into *end. - */ -static int -match_charclass(const char *p, wchar_t chr, const char **end) -{ - char name[20]; - const char *nameend; - wctype_t cclass; - - *end = NULL; - p++; - nameend = strstr(p, ":]"); - if (nameend == NULL || (size_t)(nameend - p) >= sizeof(name) || - nameend == p) - return 0; - memcpy(name, p, nameend - p); - name[nameend - p] = '\0'; - *end = nameend + 2; - cclass = wctype(name); - /* An unknown class matches nothing but is valid nevertheless. */ - if (cclass == 0) - return 0; - return iswctype(chr, cclass); -} - - -/* - * Returns true if the pattern matches the string. - */ - -static int -patmatch(const char *pattern, const char *string) -{ - const char *p, *q, *end; - const char *bt_p, *bt_q; - char c; - wchar_t wc, wc2; - - p = pattern; - q = string; - bt_p = NULL; - bt_q = NULL; - for (;;) { - switch (c = *p++) { - case '\0': - if (*q != '\0') - goto backtrack; - return 1; - case CTLESC: - if (*q++ != *p++) - goto backtrack; - break; - case '?': - if (*q == '\0') - return 0; - if (localeisutf8) { - wc = get_wc(&q); - /* - * A '?' does not match invalid UTF-8 but a - * '*' does, so backtrack. - */ - if (wc == 0) - goto backtrack; - } else - q++; - break; - case '*': - c = *p; - while (c == '*') - c = *++p; - /* - * If the pattern ends here, we know the string - * matches without needing to look at the rest of it. - */ - if (c == '\0') - return 1; - /* - * First try the shortest match for the '*' that - * could work. We can forget any earlier '*' since - * there is no way having it match more characters - * can help us, given that we are already here. - */ - bt_p = p; - bt_q = q; - break; - case '[': { - const char *savep, *saveq; - int invert, found; - wchar_t chr; - - savep = p, saveq = q; - invert = 0; - if (*p == '!' || *p == '^') { - invert++; - p++; - } - found = 0; - if (*q == '\0') - return 0; - if (localeisutf8) { - chr = get_wc(&q); - if (chr == 0) - goto backtrack; - } else - chr = (unsigned char)*q++; - c = *p++; - do { - if (c == '\0') { - p = savep, q = saveq; - c = '['; - goto dft; - } - if (c == '[' && *p == ':') { - found |= match_charclass(p, chr, &end); - if (end != NULL) { - p = end; - continue; - } - } - if (c == CTLESC) - c = *p++; - if (localeisutf8 && c & 0x80) { - p--; - wc = get_wc(&p); - if (wc == 0) /* bad utf-8 */ - return 0; - } else - wc = (unsigned char)c; - if (*p == '-' && p[1] != ']') { - p++; - if (*p == CTLESC) - p++; - if (localeisutf8) { - wc2 = get_wc(&p); - if (wc2 == 0) /* bad utf-8 */ - return 0; - } else - wc2 = (unsigned char)*p++; - if ( collate_range_cmp(chr, wc) >= 0 - && collate_range_cmp(chr, wc2) <= 0 - ) - found = 1; - } else { - if (chr == wc) - found = 1; - } - } while ((c = *p++) != ']'); - if (found == invert) - goto backtrack; - break; - } -dft: default: - if (*q == '\0') - return 0; - if (*q++ == c) - break; -backtrack: - /* - * If we have a mismatch (other than hitting the end - * of the string), go back to the last '*' seen and - * have it match one additional character. - */ - if (bt_p == NULL) - return 0; - if (*bt_q == '\0') - return 0; - bt_q++; - p = bt_p; - q = bt_q; - break; - } - } -} - - - -/* - * Remove any CTLESC and CTLQUOTEMARK characters from a string. - */ - -void -rmescapes(char *str) -{ - char *p, *q; - - p = str; - while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) { - if (*p++ == '\0') - return; - } - q = p; - while (*p) { - if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) { - p++; - continue; - } - if (*p == CTLESC) - p++; - *q++ = *p++; - } - *q = '\0'; -} - - - -/* - * See if a pattern matches in a case statement. - */ - -int -casematch(union node *pattern, const char *val) -{ - struct stackmark smark; - struct nodelist *argbackq; - int result; - char *p; - - setstackmark(&smark); - argbackq = pattern->narg.backquote; - STARTSTACKSTR(expdest); - argstr(pattern->narg.text, &argbackq, EXP_TILDE | EXP_CASE, NULL); - STPUTC('\0', expdest); - p = grabstackstr(expdest); - result = patmatch(p, val); - popstackmark(&smark); - return result; -} - -/* - * Our own itoa(). - */ - -static void -cvtnum(int num, char *buf) -{ - char temp[32]; - int neg = num < 0; - char *p = temp + 31; - - temp[31] = '\0'; - - do { - *--p = num % 10 + '0'; - } while ((num /= 10) != 0); - - if (neg) - *--p = '-'; - - memcpy(buf, p, temp + 32 - p); -} - -/* - * Do most of the work for wordexp(3). - */ - -int -wordexpcmd(int argc, char **argv) -{ - size_t len; - int i; - - out1fmt("%08x", argc - 1); - for (i = 1, len = 0; i < argc; i++) - len += strlen(argv[i]); - out1fmt("%08x", (int)len); - for (i = 1; i < argc; i++) - outbin(argv[i], strlen(argv[i]) + 1, out1); - return (0); -} - -/* - * Do most of the work for wordexp(3), new version. - */ - -int -freebsd_wordexpcmd(int argc __unused, char **argv __unused) -{ - struct arglist arglist; - union node *args, *n; - size_t len; - int ch; - int protected = 0; - int fd = -1; - int i; - - while ((ch = nextopt("f:p")) != '\0') { - switch (ch) { - case 'f': - fd = number(shoptarg); - break; - case 'p': - protected = 1; - break; - } - } - if (*argptr != NULL) - error("wrong number of arguments"); - if (fd < 0) - error("missing fd"); - INTOFF; - setinputfd(fd, 1); - INTON; - args = parsewordexp(); - popfile(); /* will also close fd */ - if (protected) - for (n = args; n != NULL; n = n->narg.next) { - if (n->narg.backquote != NULL) { - outcslow('C', out1); - error("command substitution disabled"); - } - } - outcslow(' ', out1); - emptyarglist(&arglist); - for (n = args; n != NULL; n = n->narg.next) - expandarg(n, &arglist, EXP_FULL | EXP_TILDE); - for (i = 0, len = 0; i < arglist.count; i++) - len += strlen(arglist.args[i]); - out1fmt("%016x %016zx", arglist.count, len); - for (i = 0; i < arglist.count; i++) - outbin(arglist.args[i], strlen(arglist.args[i]) + 1, out1); - return (0); -} |