/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1997-2005 * Herbert Xu . 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. * * @(#)expand.c 8.5 (Berkeley) 5/15/95 * $FreeBSD: src/bin/sh/expand.c,v 1.84 2011/05/07 14:32:16 jilles Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include /* * 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" /* * Structure specifying which parts of the string should be searched * for IFS characters. */ struct ifsregion { struct ifsregion *next; /* next region in list */ int begoff; /* offset of start of region */ int endoff; /* offset of end of region */ int inquotes; /* search for nul bytes only */ }; static char *expdest; /* output of current string */ static struct nodelist *argbackq; /* list of back quote expressions */ static struct ifsregion ifsfirst; /* first struct in list of ifs regions */ static struct ifsregion *ifslastp; /* last struct in list */ static struct arglist exparg; /* holds expanded arg list */ static void argstr(char *, int); static char *exptilde(char *, int); static void expbackq(union node *, int, int); static int subevalvar(char *, char *, int, int, int, int, int); static char *evalvar(char *, int); static int varisset(char *, int); static void varvalue(char *, int, int, int); static void recordregion(int, int, int); static void removerecordregions(int); static void ifsbreakup(char *, struct arglist *); static void expandmeta(struct strlist *, int); static void expmeta(char *, char *); static void addfname(char *); static struct strlist *expsort(struct strlist *); static struct strlist *msort(struct strlist *, int); static char *cvtnum(int, char *); static int collate_range_cmp(int, int); static int collate_range_cmp(int c1, int c2) { static char s1[2], s2[2]; s1[0] = c1; s2[0] = c2; return (strcoll(s1, s2)); } /* * Expand shell variables and backquotes inside a here document. * union node *arg the document * int fd; where to write the expanded version */ void expandhere(union node *arg, int fd) { expandarg(arg, NULL, 0); xwrite(fd, stackblock(), expdest - stackblock()); } 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) /* * 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. * * Caution: this function uses global state and is not reentrant. * However, a new invocation after an interrupted invocation is safe * and will reset the global state for the new call. */ void expandarg(union node *arg, struct arglist *arglist, int flag) { struct strlist *sp; char *p; argbackq = arg->narg.backquote; STARTSTACKSTR(expdest); ifsfirst.next = NULL; ifslastp = NULL; argstr(arg->narg.text, flag); if (arglist == NULL) { return; /* here document expanded */ } STPUTC('\0', expdest); p = grabstackstr(expdest); exparg.lastp = &exparg.list; /* * TODO - EXP_REDIR */ if (flag & EXP_FULL) { ifsbreakup(p, &exparg); *exparg.lastp = NULL; exparg.lastp = &exparg.list; expandmeta(exparg.list, flag); } else { if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */ rmescapes(p); sp = (struct strlist *)stalloc(sizeof (struct strlist)); sp->text = p; *exparg.lastp = sp; exparg.lastp = &sp->next; } while (ifsfirst.next != NULL) { struct ifsregion *ifsp; INTOFF; ifsp = ifsfirst.next->next; ckfree(ifsfirst.next); ifsfirst.next = ifsp; INTON; } *exparg.lastp = NULL; if (exparg.list) { *arglist->lastp = exparg.list; arglist->lastp = exparg.lastp; } } /* * Perform parameter expansion, command substitution and arithmetic * expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE. * Processing ends at a CTLENDVAR character as well as '\0'. * This is used to expand word in ${var+word} etc. * If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC * characters to allow for further processing. * If EXP_FULL is set, also preserve CTLQUOTEMARK characters. */ static void argstr(char *p, int flag) { char c; int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */ int firsteq = 1; int split_lit; int lit_quoted; split_lit = flag & EXP_SPLIT_LIT; lit_quoted = flag & EXP_LIT_QUOTED; flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED); if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE))) p = exptilde(p, flag); for (;;) { CHECKSTRSPACE(2, expdest); switch (c = *p++) { case '\0': case CTLENDVAR: goto breakloop; case CTLQUOTEMARK: lit_quoted = 1; /* "$@" syntax adherence hack */ if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=') break; if ((flag & EXP_FULL) != 0) USTPUTC(c, expdest); break; case CTLQUOTEEND: lit_quoted = 0; break; case CTLESC: if (quotes) USTPUTC(c, expdest); c = *p++; USTPUTC(c, expdest); if (split_lit && !lit_quoted) recordregion(expdest - stackblock() - (quotes ? 2 : 1), expdest - stackblock(), 0); break; case CTLVAR: p = evalvar(p, flag); break; case CTLBACKQ: case CTLBACKQ|CTLQUOTE: expbackq(argbackq->n, c & CTLQUOTE, flag); argbackq = argbackq->next; break; case CTLENDARI: expari(flag); break; case ':': case '=': /* * sort of a hack - expand tildes in variable * assignments (after the first '=' and after ':'s). */ USTPUTC(c, expdest); if (split_lit && !lit_quoted) recordregion(expdest - stackblock() - 1, expdest - stackblock(), 0); if (flag & EXP_VARTILDE && *p == '~' && (c != '=' || firsteq)) { if (c == '=') firsteq = 0; p = exptilde(p, flag); } break; default: USTPUTC(c, expdest); if (split_lit && !lit_quoted) recordregion(expdest - stackblock() - 1, expdest - stackblock(), 0); } } breakloop:; } /* * Perform tilde expansion, placing the result in the stack string and * returning the next position in the input string to process. */ static char * exptilde(char *p, int flag) { char c, *startp = p; struct passwd *pw; char *home; int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); while ((c = *p) != '\0') { 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) goto done; break; case '/': case CTLENDVAR: goto done; } p++; } done: *p = '\0'; if (*(startp+1) == '\0') { if ((home = lookupvar("HOME")) == NULL) goto lose; } else { if ((pw = getpwnam(startp+1)) == NULL) goto lose; home = pw->pw_dir; } if (*home == '\0') goto lose; *p = c; if (quotes) STPUTS_QUOTES(home, SQSYNTAX, expdest); else STPUTS(home, expdest); return (p); lose: *p = c; return (startp); } static void removerecordregions(int endoff) { if (ifslastp == NULL) return; if (ifsfirst.endoff > endoff) { while (ifsfirst.next != NULL) { struct ifsregion *ifsp; INTOFF; ifsp = ifsfirst.next->next; ckfree(ifsfirst.next); ifsfirst.next = ifsp; INTON; } if (ifsfirst.begoff > endoff) ifslastp = NULL; else { ifslastp = &ifsfirst; ifsfirst.endoff = endoff; } return; } ifslastp = &ifsfirst; while (ifslastp->next && ifslastp->next->begoff < endoff) ifslastp=ifslastp->next; while (ifslastp->next != NULL) { struct ifsregion *ifsp; INTOFF; ifsp = ifslastp->next->next; ckfree(ifslastp->next); ifslastp->next = ifsp; INTON; } if (ifslastp->endoff > endoff) ifslastp->endoff = endoff; } /* * Expand arithmetic expression. Backup to start of expression, * evaluate, place result in (backed up) result, adjust string position. */ void expari(int flag) { char *p, *q, *start; arith_t result; int begoff; int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); int quoted; /* * This routine is slightly over-complicated for * efficiency. First we make sure there is * enough space for the result, which may be bigger * than the expression. Next we * scan backwards looking for the start of arithmetic. If the * next previous character is a CTLESC character, then we * have to rescan starting from the beginning since CTLESC * characters have to be processed left to right. */ CHECKSTRSPACE(DIGITS(result) - 2, expdest); USTPUTC('\0', expdest); start = stackblock(); p = expdest - 2; while (p >= start && *p != CTLARI) --p; if (p < start || *p != CTLARI) error("missing CTLARI (shouldn't happen)"); if (p > start && *(p - 1) == CTLESC) for (p = start; *p != CTLARI; p++) if (*p == CTLESC) p++; if (p[1] == '"') quoted=1; else quoted=0; begoff = p - start; removerecordregions(begoff); if (quotes) rmescapes(p+2); q = grabstackstr(expdest); result = arith(p+2); ungrabstackstr(q, expdest); fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result); while (*p++) ; if (quoted == 0) recordregion(begoff, p - 1 - start, 0); result = expdest - p + 1; STADJUST(-result, expdest); } /* * Perform command substitution. */ static void expbackq(union node *cmd, int quoted, int flag) { struct backcmd in; int i; char buf[128]; char *p; char *dest = expdest; struct ifsregion saveifs, *savelastp; struct nodelist *saveargbackq; char lastc; int startloc = dest - stackblock(); char const *syntax = quoted? DQSYNTAX : BASESYNTAX; int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); int nnl; INTOFF; saveifs = ifsfirst; savelastp = ifslastp; saveargbackq = argbackq; p = grabstackstr(dest); evalbackcmd(cmd, &in); ungrabstackstr(p, dest); ifsfirst = saveifs; ifslastp = savelastp; argbackq = saveargbackq; p = in.buf; lastc = '\0'; nnl = 0; /* Don't copy 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') { if (lastc == '\n') { nnl++; } else { CHECKSTRSPACE(nnl + 2, dest); while (nnl > 0) { nnl--; USTPUTC('\n', dest); } if (quotes && syntax[(int)lastc] == CCTL) USTPUTC(CTLESC, dest); USTPUTC(lastc, dest); } } } if (in.fd >= 0) close(in.fd); if (in.buf) ckfree(in.buf); if (in.jp) exitstatus = waitforjob(in.jp, NULL); if (quoted == 0) recordregion(startloc, dest - stackblock(), 0); TRACE(("expbackq: size=%td: \"%.*s\"\n", ((dest - stackblock()) - startloc), (int)((dest - stackblock()) - startloc), stackblock() + startloc)); expdest = dest; INTON; } static int subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes) { char *startp; char *loc = NULL; char *q; int c = 0; struct nodelist *saveargbackq = argbackq; int amount; argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX || subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ? EXP_CASE : 0) | EXP_TILDE); STACKSTRNUL(expdest); argbackq = saveargbackq; startp = stackblock() + startloc; if (str == NULL) str = stackblock() + strloc; switch (subtype) { case VSASSIGN: setvar(str, startp, 0); amount = startp - expdest; STADJUST(amount, expdest); varflags &= ~VSNUL; return 1; case VSQUESTION: if (*p != CTLENDVAR) { outfmt(out2, "%s\n", startp); error(NULL); } error("%.*s: parameter %snot set", (int)(p - str - 1), str, (varflags & VSNUL) ? "null or " : nullstr); return 0; case VSTRIMLEFT: for (loc = startp; loc < str; loc++) { c = *loc; *loc = '\0'; if (patmatch(str, startp, quotes)) { *loc = c; goto recordleft; } *loc = c; if (quotes && *loc == CTLESC) loc++; } return 0; case VSTRIMLEFTMAX: for (loc = str - 1; loc >= startp;) { c = *loc; *loc = '\0'; if (patmatch(str, startp, quotes)) { *loc = c; goto recordleft; } *loc = c; loc--; if (quotes && loc > startp && *(loc - 1) == CTLESC) { for (q = startp; q < loc; q++) if (*q == CTLESC) q++; if (q > loc) loc--; } } return 0; case VSTRIMRIGHT: for (loc = str - 1; loc >= startp;) { if (patmatch(str, loc, quotes)) { amount = loc - expdest; STADJUST(amount, expdest); return 1; } loc--; if (quotes && loc > startp && *(loc - 1) == CTLESC) { for (q = startp; q < loc; q++) if (*q == CTLESC) q++; if (q > loc) loc--; } } return 0; case VSTRIMRIGHTMAX: for (loc = startp; loc < str - 1; loc++) { if (patmatch(str, loc, quotes)) { amount = loc - expdest; STADJUST(amount, expdest); return 1; } if (quotes && *loc == CTLESC) loc++; } return 0; default: abort(); } recordleft: amount = ((str - 1) - (loc - startp)) - expdest; STADJUST(amount, expdest); while (loc != str - 1) *startp++ = *loc++; return 1; } /* * Expand a variable, and return a pointer to the next character in the * input string. */ static char * evalvar(char *p, int flag) { int subtype; int varflags; char *var; char *val; int patloc; int c; int set; int special; int startloc; int varlen; int varlenb; int easy; int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); varflags = (unsigned char)*p++; subtype = varflags & VSTYPE; var = p; special = 0; if (! is_name(*p)) special = 1; p = strchr(p, '=') + 1; again: /* jump here after setting a variable with ${var=text} */ if (varflags & VSLINENO) { set = 1; special = 0; val = var; p[-1] = '\0'; /* temporarily overwrite '=' to have \0 terminated string */ } 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) { varvalue(var, varflags & VSQUOTE, subtype, flag); 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 { char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX : BASESYNTAX; if (subtype == VSLENGTH) { for (;*val; val++) if (!localeisutf8 || (*val & 0xC0) != 0x80) varlen++; } else { if (quotes) STPUTS_QUOTES(val, syntax, expdest); else STPUTS(val, expdest); } } } if (subtype == VSPLUS) set = ! set; easy = ((varflags & VSQUOTE) == 0 || (*var == '@' && shellparam.nparam != 1)); switch (subtype) { case VSLENGTH: expdest = cvtnum(varlen, expdest); goto record; case VSNORMAL: if (!easy) break; record: recordregion(startloc, expdest - stackblock(), varflags & VSQUOTE); break; case VSPLUS: case VSMINUS: if (!set) { argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) | (varflags & VSQUOTE ? EXP_LIT_QUOTED : 0)); break; } if (easy) goto record; 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(); if (subevalvar(p, NULL, patloc, subtype, startloc, varflags, quotes) == 0) { int amount = (expdest - stackblock() - patloc) + 1; STADJUST(-amount, expdest); } /* Remove any recorded regions beyond start of variable */ removerecordregions(startloc); goto record; case VSASSIGN: case VSQUESTION: if (!set) { if (subevalvar(p, var, 0, subtype, startloc, varflags, quotes)) { varflags &= ~VSNUL; /* * Remove any recorded regions beyond * start of variable */ removerecordregions(startloc); goto again; } break; } if (easy) goto record; break; case VSERROR: c = p - var - 1; error("${%.*s%s}: Bad substitution", c, var, (c > 0 && *p != CTLENDVAR) ? "..." : ""); default: abort(); } p[-1] = '='; /* recover overwritten '=' */ if (subtype != VSNORMAL) { /* skip to end of alternative */ int nesting = 1; for (;;) { if ((c = *p++) == CTLESC) p++; else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) { if (set) 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 specialized variable is set. */ static int varisset(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; int num = atoi(name); if (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) { if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH) STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest); else STPUTS(p, expdest); } /* * Add the value of a specialized variable to the stack string. */ static void varvalue(char *name, int quoted, int subtype, int flag) { int num; char *p; int i; char sep; char **ap; switch (*name) { case '$': num = rootpid; goto numvar; case '?': num = oexitstatus; goto numvar; case '#': num = shellparam.nparam; goto numvar; case '!': num = backgndpidval(); numvar: expdest = cvtnum(num, expdest); break; case '-': for (i = 0 ; i < NOPTS ; i++) { if (optlist[i].val) STPUTC(optlist[i].letter, expdest); } break; case '@': if (flag & EXP_FULL && quoted) { for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { strtodest(p, flag, subtype, quoted); if (*ap) STPUTC('\0', expdest); } break; } /* FALLTHROUGH */ case '*': if (ifsset()) sep = ifsval()[0]; else sep = ' '; for (ap = shellparam.p ; (p = *ap++) != NULL ; ) { strtodest(p, flag, subtype, quoted); if (*ap && sep) STPUTC(sep, expdest); } break; case '0': p = arg0; strtodest(p, flag, subtype, quoted); break; default: if (is_digit(*name)) { num = atoi(name); if (num > 0 && num <= shellparam.nparam) { p = shellparam.p[num - 1]; strtodest(p, flag, subtype, quoted); } } break; } } /* * Record the fact that we have to scan this region of the * string for IFS characters. */ static void recordregion(int start, int end, int inquotes) { struct ifsregion *ifsp; if (ifslastp == NULL) { ifsp = &ifsfirst; } else { if (ifslastp->endoff == start && ifslastp->inquotes == inquotes) { /* extend previous area */ ifslastp->endoff = end; return; } ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion)); ifslastp->next = ifsp; } ifslastp = ifsp; ifslastp->next = NULL; ifslastp->begoff = start; ifslastp->endoff = end; ifslastp->inquotes = inquotes; } /* * Break the argument string into pieces based upon IFS and add the * strings to the argument list. The regions of the string to be * searched for IFS characters have been stored by recordregion. * CTLESC characters are preserved but have little effect in this pass * other than escaping CTL* characters. In particular, they do not escape * IFS characters: that should be done with the ifsregion mechanism. * CTLQUOTEMARK characters are used to preserve empty quoted strings. * This pass treats them as a regular character, making the string non-empty. * Later, they are removed along with the other CTL* characters. */ static void ifsbreakup(char *string, struct arglist *arglist) { struct ifsregion *ifsp; struct strlist *sp; char *start; char *p; char *q; const char *ifs; const char *ifsspc; int had_param_ch = 0; start = string; if (ifslastp == NULL) { /* Return entire argument, IFS doesn't apply to any of it */ sp = (struct strlist *)stalloc(sizeof *sp); sp->text = start; *arglist->lastp = sp; arglist->lastp = &sp->next; return; } ifs = ifsset() ? ifsval() : " \t\n"; for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) { p = string + ifsp->begoff; while (p < string + ifsp->endoff) { q = p; if (*p == CTLESC) p++; if (ifsp->inquotes) { /* Only NULs (should be from "$@") end args */ had_param_ch = 1; if (*p != 0) { p++; continue; } ifsspc = NULL; } else { if (!strchr(ifs, *p)) { had_param_ch = 1; p++; continue; } ifsspc = strchr(" \t\n", *p); /* Ignore IFS whitespace at start */ if (q == start && ifsspc != NULL) { p++; start = p; continue; } had_param_ch = 0; } /* Save this argument... */ *q = '\0'; sp = (struct strlist *)stalloc(sizeof *sp); sp->text = start; *arglist->lastp = sp; arglist->lastp = &sp->next; p++; if (ifsspc != NULL) { /* Ignore further trailing IFS whitespace */ for (; p < string + ifsp->endoff; p++) { q = p; if (*p == CTLESC) p++; if (strchr(ifs, *p) == NULL) { p = q; break; } if (strchr(" \t\n", *p) == NULL) { p++; break; } } } start = p; } } /* * Save anything left as an argument. * Traditionally we have treated 'IFS=':'; set -- x$IFS' as * generating 2 arguments, the second of which is empty. * Some recent clarification of the Posix spec say that it * should only generate one.... */ if (had_param_ch || *start != 0) { sp = (struct strlist *)stalloc(sizeof *sp); sp->text = start; *arglist->lastp = sp; arglist->lastp = &sp->next; } } 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 and CTLQUOTEMARK. * The results are stored in the list exparg. */ static void expandmeta(struct strlist *str, int flag __unused) { char *p; struct strlist **savelastp; struct strlist *sp; char c; /* TODO - EXP_REDIR */ while (str) { if (fflag) goto nometa; p = str->text; for (;;) { /* fast check for meta chars */ if ((c = *p++) == '\0') goto nometa; if (c == '*' || c == '?' || c == '[') break; } savelastp = exparg.lastp; INTOFF; expmeta(expdir, str->text); INTON; if (exparg.lastp == savelastp) { /* * no matches */ nometa: *exparg.lastp = str; rmescapes(str->text); exparg.lastp = &str->next; } else { *exparg.lastp = NULL; *savelastp = sp = expsort(*savelastp); while (sp->next != NULL) sp = sp->next; exparg.lastp = &sp->next; } str = str->next; } } /* * Do metacharacter (i.e. *, ?, [...]) expansion. */ static void expmeta(char *enddir, char *name) { char *p; char *q; char *start; char *endname; int metaflag; struct stat statb; DIR *dirp; struct dirent *dp; int atend; int matchdot; int esc; 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 (;;) { while (*q == CTLQUOTEMARK) q++; if (*q == CTLESC) q++; if (*q == '/' || *q == '\0') break; if (*++q == ']') { metaflag = 1; break; } } } else if (*p == '\0') break; else if (*p == CTLQUOTEMARK) continue; 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 == CTLQUOTEMARK) continue; if (*p == CTLESC) p++; *enddir++ = *p; if (*p == '\0') break; if (enddir == expdir_end) return; } if (metaflag == 0 || lstat(expdir, &statb) >= 0) addfname(expdir); return; } endname = p; if (start != name) { p = name; while (p < start) { while (*p == CTLQUOTEMARK) p++; if (*p == CTLESC) p++; *enddir++ = *p++; if (enddir == expdir_end) return; } } if (enddir == expdir) { p = __DECONST(char *, "."); } else if (enddir == expdir + 1 && *expdir == '/') { p = __DECONST(char *, "/"); } 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; while (*p == CTLQUOTEMARK) p++; 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, 0)) { if (enddir + dp->d_namlen + 1 > expdir_end) continue; memcpy(enddir, dp->d_name, dp->d_namlen + 1); if (atend) addfname(expdir); else { if (enddir + dp->d_namlen + 2 > expdir_end) continue; enddir[dp->d_namlen] = '/'; enddir[dp->d_namlen + 1] = '\0'; expmeta(enddir + dp->d_namlen + 1, endname); } } } closedir(dirp); if (! atend) endname[-esc - 1] = esc ? CTLESC : '/'; } /* * Add a file name to the list. */ static void addfname(char *name) { char *p; struct strlist *sp; p = stalloc(strlen(name) + 1); scopy(name, p); sp = (struct strlist *)stalloc(sizeof *sp); sp->text = p; *exparg.lastp = sp; exparg.lastp = &sp->next; } /* * Sort the results of file name expansion. It calculates the number of * strings to sort and then calls msort (short for merge sort) to do the * work. */ static struct strlist * expsort(struct strlist *str) { int len; struct strlist *sp; len = 0; for (sp = str ; sp ; sp = sp->next) len++; return msort(str, len); } static struct strlist * msort(struct strlist *list, int len) { struct strlist *p, *q = NULL; struct strlist **lpp; int half; int n; if (len <= 1) return list; half = len >> 1; p = list; for (n = half ; --n >= 0 ; ) { q = p; p = p->next; } q->next = NULL; /* terminate first half of list */ q = msort(list, half); /* sort first half of list */ p = msort(p, len - half); /* sort second half */ lpp = &list; for (;;) { if (strcmp(p->text, q->text) < 0) { *lpp = p; lpp = &p->next; if ((p = *lpp) == NULL) { *lpp = q; break; } } else { *lpp = q; lpp = &q->next; if ((q = *lpp) == NULL) { *lpp = p; break; } } } return list; } /* * Returns true if the pattern matches the string. */ int patmatch(const char *pattern, const char *string, int squoted) { const char *p, *q; char c; p = pattern; q = string; for (;;) { switch (c = *p++) { case '\0': goto breakloop; case CTLESC: if (squoted && *q == CTLESC) q++; if (*q++ != *p++) return 0; break; case CTLQUOTEMARK: continue; case '?': if (squoted && *q == CTLESC) q++; if (*q++ == '\0') return 0; break; case '*': c = *p; while (c == CTLQUOTEMARK || c == '*') c = *++p; if (c != CTLESC && c != CTLQUOTEMARK && c != '?' && c != '*' && c != '[') { while (*q != c) { if (squoted && *q == CTLESC && q[1] == c) break; if (*q == '\0') return 0; if (squoted && *q == CTLESC) q++; q++; } } do { if (patmatch(p, q, squoted)) return 1; if (squoted && *q == CTLESC) q++; } while (*q++ != '\0'); return 0; case '[': { const char *endp; int invert, found; char chr; endp = p; if (*endp == '!' || *endp == '^') endp++; for (;;) { while (*endp == CTLQUOTEMARK) endp++; if (*endp == '\0') goto dft; /* no matching ] */ if (*endp == CTLESC) endp++; if (*++endp == ']') break; } invert = 0; if (*p == '!' || *p == '^') { invert++; p++; } found = 0; chr = *q++; if (squoted && chr == CTLESC) chr = *q++; if (chr == '\0') return 0; c = *p++; do { if (c == CTLQUOTEMARK) continue; if (c == CTLESC) c = *p++; if (*p == '-' && p[1] != ']') { p++; while (*p == CTLQUOTEMARK) p++; if (*p == CTLESC) p++; if ( collate_range_cmp(chr, c) >= 0 && collate_range_cmp(chr, *p) <= 0 ) found = 1; p++; } else { if (chr == c) found = 1; } } while ((c = *p++) != ']'); if (found == invert) return 0; break; } dft: default: if (squoted && *q == CTLESC) q++; if (*q++ != c) return 0; break; } } breakloop: if (*q != '\0') return 0; return 1; } /* * 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; int result; char *p; setstackmark(&smark); argbackq = pattern->narg.backquote; STARTSTACKSTR(expdest); ifslastp = NULL; argstr(pattern->narg.text, EXP_TILDE | EXP_CASE); STPUTC('\0', expdest); p = grabstackstr(expdest); result = patmatch(p, val, 0); popstackmark(&smark); return result; } /* * Our own itoa(). */ static char * 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 = '-'; STPUTS(p, buf); return buf; } /* * Check statically if expanding a string may have side effects. */ int expandhassideeffects(const char *p) { int c; int arinest; arinest = 0; while ((c = *p++) != '\0') { switch (c) { case CTLESC: p++; break; case CTLVAR: c = *p++; /* Expanding $! sets the job to remembered. */ if (*p == '!') return 1; if ((c & VSTYPE) == VSASSIGN) return 1; /* * If we are in arithmetic, the parameter may contain * '=' which may cause side effects. Exceptions are * the length of a parameter and $$, $# and $? which * are always numeric. */ if ((c & VSTYPE) == VSLENGTH) { while (*p != '=') p++; p++; break; } if ((*p == '$' || *p == '#' || *p == '?') && p[1] == '=') { p += 2; break; } if (arinest > 0) return 1; break; case CTLBACKQ: case CTLBACKQ | CTLQUOTE: if (arinest > 0) return 1; break; case CTLARI: arinest++; break; case CTLENDARI: arinest--; break; case '=': if (*p == '=') { /* Allow '==' operator. */ p++; continue; } if (arinest > 0) return 1; break; case '!': case '<': case '>': /* Allow '!=', '<=', '>=' operators. */ if (*p == '=') p++; break; } } return 0; } /* * 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); }