1490 lines
34 KiB
C
1490 lines
34 KiB
C
/* $OpenBSD: eval.c,v 1.33 2007/08/02 11:05:54 fgsch Exp $ */
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.46 2008/05/17 18:46:58 tg Exp $");
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#ifdef MKSH_SMALL
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#define MKSH_NOPWNAM
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#endif
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/*
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* string expansion
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*
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* first pass: quoting, IFS separation, ~, ${}, $() and $(()) substitution.
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* second pass: alternation ({,}), filename expansion (*?[]).
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*/
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/* expansion generator state */
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typedef struct Expand {
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/* int type; */ /* see expand() */
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const char *str; /* string */
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union {
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const char **strv;/* string[] */
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struct shf *shf; /* file */
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} u; /* source */
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struct tbl *var; /* variable in ${var..} */
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short split; /* split "$@" / call waitlast $() */
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} Expand;
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#define XBASE 0 /* scanning original */
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#define XSUB 1 /* expanding ${} string */
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#define XARGSEP 2 /* ifs0 between "$*" */
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#define XARG 3 /* expanding $*, $@ */
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#define XCOM 4 /* expanding $() */
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#define XNULLSUB 5 /* "$@" when $# is 0 (don't generate word) */
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#define XSUBMID 6 /* middle of expanding ${} */
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/* States used for field splitting */
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#define IFS_WORD 0 /* word has chars (or quotes) */
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#define IFS_WS 1 /* have seen IFS white-space */
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#define IFS_NWS 2 /* have seen IFS non-white-space */
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static int varsub(Expand *, const char *, const char *, int *, int *);
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static int comsub(Expand *, const char *);
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static char *trimsub(char *, char *, int);
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static void glob(char *, XPtrV *, int);
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static void globit(XString *, char **, char *, XPtrV *, int);
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static const char *maybe_expand_tilde(const char *, XString *, char **, int);
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static char *tilde(char *);
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#ifndef MKSH_NOPWNAM
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static char *homedir(char *);
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#endif
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static void alt_expand(XPtrV *, char *, char *, char *, int);
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/* compile and expand word */
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char *
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substitute(const char *cp, int f)
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{
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struct source *s, *sold;
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sold = source;
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s = pushs(SWSTR, ATEMP);
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s->start = s->str = cp;
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source = s;
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if (yylex(ONEWORD) != LWORD)
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internal_errorf("substitute");
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source = sold;
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afree(s, ATEMP);
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return evalstr(yylval.cp, f);
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}
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/*
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* expand arg-list
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*/
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char **
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eval(const char **ap, int f)
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{
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XPtrV w;
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if (*ap == NULL) {
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union mksh_ccphack vap;
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vap.ro = ap;
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return (vap.rw);
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}
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XPinit(w, 32);
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XPput(w, NULL); /* space for shell name */
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while (*ap != NULL)
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expand(*ap++, &w, f);
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XPput(w, NULL);
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return (char **) XPclose(w) + 1;
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}
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/*
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* expand string
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*/
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char *
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evalstr(const char *cp, int f)
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{
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XPtrV w;
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char *dp = null;
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XPinit(w, 1);
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expand(cp, &w, f);
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if (XPsize(w))
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dp = *XPptrv(w);
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XPfree(w);
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return (dp);
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}
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/*
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* expand string - return only one component
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* used from iosetup to expand redirection files
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*/
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char *
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evalonestr(const char *cp, int f)
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{
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XPtrV w;
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char *rv;
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XPinit(w, 1);
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expand(cp, &w, f);
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switch (XPsize(w)) {
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case 0:
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rv = null;
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break;
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case 1:
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rv = (char *) *XPptrv(w);
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break;
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default:
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rv = evalstr(cp, f&~DOGLOB);
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break;
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}
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XPfree(w);
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return (rv);
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}
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/* for nested substitution: ${var:=$var2} */
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typedef struct SubType {
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short stype; /* [=+-?%#] action after expanded word */
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short base; /* begin position of expanded word */
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short f; /* saved value of f (DOPAT, etc) */
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short quote; /* saved value of quote (for ${..[%#]..}) */
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struct tbl *var; /* variable for ${var..} */
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struct SubType *prev; /* old type */
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struct SubType *next; /* poped type (to avoid re-allocating) */
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} SubType;
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void
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expand(const char *cp, /* input word */
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XPtrV *wp, /* output words */
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int f) /* DO* flags */
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{
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int c = 0;
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int type; /* expansion type */
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int quote = 0; /* quoted */
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XString ds; /* destination string */
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char *dp; /* destination */
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const char *sp; /* source */
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int fdo, word; /* second pass flags; have word */
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int doblank; /* field splitting of parameter/command subst */
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Expand x = { /* expansion variables */
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NULL, { NULL }, NULL, 0
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};
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SubType st_head, *st;
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int newlines = 0; /* For trailing newlines in COMSUB */
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int saw_eq, tilde_ok;
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int make_magic;
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size_t len;
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if (cp == NULL)
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internal_errorf("expand(NULL)");
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/* for alias, readonly, set, typeset commands */
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if ((f & DOVACHECK) && is_wdvarassign(cp)) {
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f &= ~(DOVACHECK|DOBLANK|DOGLOB|DOTILDE);
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f |= DOASNTILDE;
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}
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if (Flag(FNOGLOB))
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f &= ~DOGLOB;
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if (Flag(FMARKDIRS))
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f |= DOMARKDIRS;
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if (Flag(FBRACEEXPAND) && (f & DOGLOB))
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f |= DOBRACE_;
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Xinit(ds, dp, 128, ATEMP); /* init dest. string */
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type = XBASE;
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sp = cp;
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fdo = 0;
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saw_eq = 0;
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tilde_ok = (f & (DOTILDE|DOASNTILDE)) ? 1 : 0; /* must be 1/0 */
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doblank = 0;
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make_magic = 0;
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word = (f&DOBLANK) ? IFS_WS : IFS_WORD;
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st_head.next = NULL;
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st = &st_head;
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while (1) {
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Xcheck(ds, dp);
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switch (type) {
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case XBASE: /* original prefixed string */
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c = *sp++;
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switch (c) {
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case EOS:
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c = 0;
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break;
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case CHAR:
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c = *sp++;
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break;
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case QCHAR:
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quote |= 2; /* temporary quote */
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c = *sp++;
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break;
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case OQUOTE:
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word = IFS_WORD;
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tilde_ok = 0;
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quote = 1;
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continue;
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case CQUOTE:
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quote = 0;
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continue;
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case COMSUB:
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tilde_ok = 0;
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if (f & DONTRUNCOMMAND) {
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word = IFS_WORD;
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*dp++ = '$'; *dp++ = '(';
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while (*sp != '\0') {
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Xcheck(ds, dp);
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*dp++ = *sp++;
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}
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*dp++ = ')';
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} else {
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type = comsub(&x, sp);
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if (type == XCOM && (f&DOBLANK))
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doblank++;
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sp = strnul(sp) + 1;
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newlines = 0;
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}
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continue;
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case EXPRSUB:
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word = IFS_WORD;
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tilde_ok = 0;
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if (f & DONTRUNCOMMAND) {
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*dp++ = '$'; *dp++ = '('; *dp++ = '(';
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while (*sp != '\0') {
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Xcheck(ds, dp);
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*dp++ = *sp++;
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}
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*dp++ = ')'; *dp++ = ')';
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} else {
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struct tbl v;
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char *p;
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v.flag = DEFINED|ISSET|INTEGER;
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v.type = 10; /* not default */
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v.name[0] = '\0';
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v_evaluate(&v, substitute(sp, 0),
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KSH_UNWIND_ERROR, true);
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sp = strnul(sp) + 1;
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for (p = str_val(&v); *p; ) {
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Xcheck(ds, dp);
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*dp++ = *p++;
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}
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}
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continue;
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case OSUBST: /* ${{#}var{:}[=+-?#%]word} */
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/* format is:
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* OSUBST [{x] plain-variable-part \0
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* compiled-word-part CSUBST [}x]
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* This is where all syntax checking gets done...
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*/
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{
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const char *varname = ++sp; /* skip the { or x (}) */
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int stype;
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int slen = 0;
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sp = cstrchr(sp, '\0') + 1; /* skip variable */
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type = varsub(&x, varname, sp, &stype, &slen);
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if (type < 0) {
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char *beg, *end, *str;
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unwind_substsyn:
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sp = varname - 2; /* restore sp */
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end = (beg = wdcopy(sp, ATEMP)) +
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(wdscan(sp, CSUBST) - sp);
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/* ({) the } or x is already skipped */
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if (end < wdscan(beg, EOS))
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*end = EOS;
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str = snptreef(NULL, 64, "%S", beg);
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afree(beg, ATEMP);
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errorf("%s: bad substitution", str);
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}
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if (f & DOBLANK)
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doblank++;
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tilde_ok = 0;
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if (type == XBASE) { /* expand? */
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if (!st->next) {
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SubType *newst;
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newst = (SubType *)alloc(
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sizeof (SubType), ATEMP);
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newst->next = NULL;
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newst->prev = st;
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st->next = newst;
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}
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st = st->next;
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st->stype = stype;
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st->base = Xsavepos(ds, dp);
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st->f = f;
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st->var = x.var;
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st->quote = quote;
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/* skip qualifier(s) */
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if (stype)
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sp += slen;
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switch (stype & 0x7f) {
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case '0': {
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char *beg, *mid, *end, *stg;
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long from = 0, num = -1, flen;
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/* ! DOBLANK,DOBRACE_,DOTILDE */
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f = DOPAT | (f&DONTRUNCOMMAND) |
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DOTEMP_;
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quote = 0;
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beg = wdcopy(sp, ATEMP);
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mid = beg + (wdscan(sp, ADELIM) - sp);
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stg = beg + (wdscan(sp, CSUBST) - sp);
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if (mid >= stg)
|
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goto unwind_substsyn;
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mid[-2] = EOS;
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if (mid[-1] == /*{*/'}') {
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sp += mid - beg - 1;
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end = NULL;
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} else {
|
||
end = mid +
|
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(wdscan(mid, ADELIM) - mid);
|
||
if (end >= stg)
|
||
goto unwind_substsyn;
|
||
end[-2] = EOS;
|
||
sp += end - beg - 1;
|
||
}
|
||
evaluate(substitute(stg = wdstrip(beg, false, false), 0),
|
||
&from, KSH_UNWIND_ERROR, true);
|
||
afree(stg, ATEMP);
|
||
if (end) {
|
||
evaluate(stg = wdstrip(mid, false, false),
|
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&num, KSH_UNWIND_ERROR, true);
|
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afree(stg, ATEMP);
|
||
}
|
||
afree(beg, ATEMP);
|
||
beg = str_val(st->var);
|
||
flen = strlen(beg);
|
||
if (from < 0) {
|
||
if (-from < flen)
|
||
beg += flen + from;
|
||
} else
|
||
beg += from < flen ? from : flen;
|
||
flen = strlen(beg);
|
||
if (num < 0 || num > flen)
|
||
num = flen;
|
||
x.str = str_nsave(beg, num, ATEMP);
|
||
goto do_CSUBST;
|
||
}
|
||
case '/': {
|
||
char *s, *p, *d, *sbeg, *end;
|
||
char *pat, *rrep;
|
||
char *tpat0, *tpat1, *tpat2;
|
||
|
||
/* ! DOBLANK,DOBRACE_,DOTILDE */
|
||
f = DOPAT | (f&DONTRUNCOMMAND) |
|
||
DOTEMP_;
|
||
quote = 0;
|
||
|
||
s = wdcopy(sp, ATEMP);
|
||
p = s + (wdscan(sp, ADELIM) - sp);
|
||
d = s + (wdscan(sp, CSUBST) - sp);
|
||
#if 0
|
||
fprintf(stderr,
|
||
"D: s=%p 〈%s〉\n"
|
||
" p=%p 〈%s〉\n"
|
||
" d=%p 〈%s〉\n",
|
||
s, wdstrip(s, true, false),
|
||
p, wdstrip(p, true, false),
|
||
d, wdstrip(d, true, false));
|
||
fflush(stderr);
|
||
#endif
|
||
if (p >= d)
|
||
goto unwind_substsyn;
|
||
p[-2] = EOS;
|
||
if (p[-1] == /*{*/'}')
|
||
d = NULL;
|
||
else
|
||
d[-2] = EOS;
|
||
sp += (d ? d : p) - s - 1;
|
||
tpat0 = wdstrip(s, true, true);
|
||
pat = substitute(tpat0, 0);
|
||
if (d) {
|
||
d = wdstrip(p, true, false);
|
||
rrep = substitute(d, 0);
|
||
afree(d, ATEMP);
|
||
} else
|
||
rrep = null;
|
||
afree(s, ATEMP);
|
||
s = d = pat;
|
||
while (*s)
|
||
if (*s != '\\' ||
|
||
s[1] == '%' ||
|
||
s[1] == '#' ||
|
||
s[1] == '\0' ||
|
||
/* XXX really? */ s[1] == '\\' ||
|
||
s[1] == '/')
|
||
*d++ = *s++;
|
||
else
|
||
s++;
|
||
*d = '\0';
|
||
#if 0
|
||
fprintf(stderr,
|
||
"D: 〔%s｜%s〕→〔%s〕\n",
|
||
tpat0, pat, rrep);
|
||
fflush(stderr);
|
||
#endif
|
||
afree(tpat0, ATEMP);
|
||
|
||
/* reject empty pattern */
|
||
if (!*pat || gmatchx("", pat, false))
|
||
goto no_repl;
|
||
|
||
/* prepare string on which to work */
|
||
sbeg = s = str_save(str_val(st->var), ATEMP);
|
||
|
||
/* first see if we have any match at all */
|
||
tpat0 = pat;
|
||
if (*pat == '#') {
|
||
/* anchor at the beginning */
|
||
tpat1 = shf_smprintf("%s%c*", ++tpat0, MAGIC);
|
||
tpat2 = tpat1;
|
||
} else if (*pat == '%') {
|
||
/* anchor at the end */
|
||
tpat1 = shf_smprintf("%c*%s", MAGIC, ++tpat0);
|
||
tpat2 = tpat0;
|
||
} else {
|
||
/* float */
|
||
tpat1 = shf_smprintf("%c*%s%c*", MAGIC, pat, MAGIC);
|
||
tpat2 = tpat1 + 2;
|
||
}
|
||
again_repl:
|
||
#if 0
|
||
fprintf(stderr,
|
||
"D: 「%s」 ← 〔%s｜%s〕\n",
|
||
s, tpat0, rrep);
|
||
fflush(stderr);
|
||
#endif
|
||
/* this would not be necessary if gmatchx would return
|
||
* the start and end values of a match found, like re*
|
||
*/
|
||
if (!gmatchx(sbeg, tpat1, false))
|
||
goto end_repl;
|
||
end = strnul(s);
|
||
/* now anchor the beginning of the match */
|
||
if (*pat != '#')
|
||
while (sbeg <= end) {
|
||
if (gmatchx(sbeg, tpat2, false))
|
||
break;
|
||
else
|
||
sbeg++;
|
||
}
|
||
/* now anchor the end of the match */
|
||
p = end;
|
||
if (*pat != '%')
|
||
while (p >= sbeg) {
|
||
bool gotmatch;
|
||
|
||
c = *p; *p = '\0';
|
||
gotmatch = gmatchx(sbeg, tpat0, false);
|
||
*p = c;
|
||
if (gotmatch)
|
||
break;
|
||
p--;
|
||
}
|
||
end = str_nsave(s, sbeg - s, ATEMP);
|
||
d = shf_smprintf("%s%s%s", end, rrep, p);
|
||
afree(end, ATEMP);
|
||
sbeg = d + (sbeg - s) + strlen(rrep);
|
||
afree(s, ATEMP);
|
||
s = d;
|
||
if (stype & 0x80)
|
||
goto again_repl;
|
||
end_repl:
|
||
afree(tpat1, ATEMP);
|
||
x.str = s;
|
||
no_repl:
|
||
afree(pat, ATEMP);
|
||
if (rrep != null)
|
||
afree(rrep, ATEMP);
|
||
goto do_CSUBST;
|
||
}
|
||
case '#':
|
||
case '%':
|
||
/* ! DOBLANK,DOBRACE_,DOTILDE */
|
||
f = DOPAT | (f&DONTRUNCOMMAND) |
|
||
DOTEMP_;
|
||
quote = 0;
|
||
/* Prepend open pattern (so |
|
||
* in a trim will work as
|
||
* expected)
|
||
*/
|
||
*dp++ = MAGIC;
|
||
*dp++ = (char)('@' | 0x80);
|
||
break;
|
||
case '=':
|
||
/* Enabling tilde expansion
|
||
* after :s here is
|
||
* non-standard ksh, but is
|
||
* consistent with rules for
|
||
* other assignments. Not
|
||
* sure what POSIX thinks of
|
||
* this.
|
||
* Not doing tilde expansion
|
||
* for integer variables is a
|
||
* non-POSIX thing - makes
|
||
* sense though, since ~ is
|
||
* a arithmetic operator.
|
||
*/
|
||
if (!(x.var->flag & INTEGER))
|
||
f |= DOASNTILDE|DOTILDE;
|
||
f |= DOTEMP_;
|
||
/* These will be done after the
|
||
* value has been assigned.
|
||
*/
|
||
f &= ~(DOBLANK|DOGLOB|DOBRACE_);
|
||
tilde_ok = 1;
|
||
break;
|
||
case '?':
|
||
f &= ~DOBLANK;
|
||
f |= DOTEMP_;
|
||
/* FALLTHRU */
|
||
default:
|
||
/* Enable tilde expansion */
|
||
tilde_ok = 1;
|
||
f |= DOTILDE;
|
||
}
|
||
} else
|
||
/* skip word */
|
||
sp += wdscan(sp, CSUBST) - sp;
|
||
continue;
|
||
}
|
||
case CSUBST: /* only get here if expanding word */
|
||
do_CSUBST:
|
||
sp++; /* ({) skip the } or x */
|
||
tilde_ok = 0; /* in case of ${unset:-} */
|
||
*dp = '\0';
|
||
quote = st->quote;
|
||
f = st->f;
|
||
if (f&DOBLANK)
|
||
doblank--;
|
||
switch (st->stype&0x7f) {
|
||
case '#':
|
||
case '%':
|
||
/* Append end-pattern */
|
||
*dp++ = MAGIC; *dp++ = ')'; *dp = '\0';
|
||
dp = Xrestpos(ds, dp, st->base);
|
||
/* Must use st->var since calling
|
||
* global would break things
|
||
* like x[i+=1].
|
||
*/
|
||
x.str = trimsub(str_val(st->var),
|
||
dp, st->stype);
|
||
type = XSUB;
|
||
if (f&DOBLANK)
|
||
doblank++;
|
||
st = st->prev;
|
||
continue;
|
||
case '=':
|
||
/* Restore our position and substitute
|
||
* the value of st->var (may not be
|
||
* the assigned value in the presence
|
||
* of integer/right-adj/etc attributes).
|
||
*/
|
||
dp = Xrestpos(ds, dp, st->base);
|
||
/* Must use st->var since calling
|
||
* global would cause with things
|
||
* like x[i+=1] to be evaluated twice.
|
||
*/
|
||
/* Note: not exported by FEXPORT
|
||
* in at&t ksh.
|
||
*/
|
||
/* XXX POSIX says readonly is only
|
||
* fatal for special builtins (setstr
|
||
* does readonly check).
|
||
*/
|
||
len = strlen(dp) + 1;
|
||
setstr(st->var,
|
||
debunk((char *)alloc(len, ATEMP),
|
||
dp, len), KSH_UNWIND_ERROR);
|
||
x.str = str_val(st->var);
|
||
type = XSUB;
|
||
if (f&DOBLANK)
|
||
doblank++;
|
||
st = st->prev;
|
||
continue;
|
||
case '?':
|
||
{
|
||
char *s = Xrestpos(ds, dp, st->base);
|
||
|
||
errorf("%s: %s", st->var->name,
|
||
dp == s ?
|
||
"parameter null or not set" :
|
||
(debunk(s, s, strlen(s) + 1), s));
|
||
}
|
||
case '0':
|
||
case '/':
|
||
dp = Xrestpos(ds, dp, st->base);
|
||
type = XSUB;
|
||
if (f&DOBLANK)
|
||
doblank++;
|
||
st = st->prev;
|
||
continue;
|
||
}
|
||
st = st->prev;
|
||
type = XBASE;
|
||
continue;
|
||
|
||
case OPAT: /* open pattern: *(foo|bar) */
|
||
/* Next char is the type of pattern */
|
||
make_magic = 1;
|
||
c = *sp++ + 0x80;
|
||
break;
|
||
|
||
case SPAT: /* pattern separator (|) */
|
||
make_magic = 1;
|
||
c = '|';
|
||
break;
|
||
|
||
case CPAT: /* close pattern */
|
||
make_magic = 1;
|
||
c = /*(*/ ')';
|
||
break;
|
||
}
|
||
break;
|
||
|
||
case XNULLSUB:
|
||
/* Special case for "$@" (and "${foo[@]}") - no
|
||
* word is generated if $# is 0 (unless there is
|
||
* other stuff inside the quotes).
|
||
*/
|
||
type = XBASE;
|
||
if (f&DOBLANK) {
|
||
doblank--;
|
||
/* not really correct: x=; "$x$@" should
|
||
* generate a null argument and
|
||
* set A; "${@:+}" shouldn't.
|
||
*/
|
||
if (dp == Xstring(ds, dp))
|
||
word = IFS_WS;
|
||
}
|
||
continue;
|
||
|
||
case XSUB:
|
||
case XSUBMID:
|
||
if ((c = *x.str++) == 0) {
|
||
type = XBASE;
|
||
if (f&DOBLANK)
|
||
doblank--;
|
||
continue;
|
||
}
|
||
break;
|
||
|
||
case XARGSEP:
|
||
type = XARG;
|
||
quote = 1;
|
||
case XARG:
|
||
if ((c = *x.str++) == '\0') {
|
||
/* force null words to be created so
|
||
* set -- '' 2 ''; foo "$@" will do
|
||
* the right thing
|
||
*/
|
||
if (quote && x.split)
|
||
word = IFS_WORD;
|
||
if ((x.str = *x.u.strv++) == NULL) {
|
||
type = XBASE;
|
||
if (f&DOBLANK)
|
||
doblank--;
|
||
continue;
|
||
}
|
||
c = ifs0;
|
||
if (c == 0) {
|
||
if (quote && !x.split)
|
||
continue;
|
||
c = ' ';
|
||
}
|
||
if (quote && x.split) {
|
||
/* terminate word for "$@" */
|
||
type = XARGSEP;
|
||
quote = 0;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case XCOM:
|
||
if (newlines) { /* Spit out saved NLs */
|
||
c = '\n';
|
||
--newlines;
|
||
} else {
|
||
while ((c = shf_getc(x.u.shf)) == 0 || c == '\n')
|
||
if (c == '\n')
|
||
newlines++; /* Save newlines */
|
||
if (newlines && c != EOF) {
|
||
shf_ungetc(c, x.u.shf);
|
||
c = '\n';
|
||
--newlines;
|
||
}
|
||
}
|
||
if (c == EOF) {
|
||
newlines = 0;
|
||
shf_close(x.u.shf);
|
||
if (x.split)
|
||
subst_exstat = waitlast();
|
||
type = XBASE;
|
||
if (f&DOBLANK)
|
||
doblank--;
|
||
continue;
|
||
}
|
||
break;
|
||
}
|
||
|
||
/* check for end of word or IFS separation */
|
||
if (c == 0 || (!quote && (f & DOBLANK) && doblank &&
|
||
!make_magic && ctype(c, C_IFS))) {
|
||
/* How words are broken up:
|
||
* | value of c
|
||
* word | ws nws 0
|
||
* -----------------------------------
|
||
* IFS_WORD w/WS w/NWS w
|
||
* IFS_WS -/WS w/NWS -
|
||
* IFS_NWS -/NWS w/NWS w
|
||
* (w means generate a word)
|
||
* Note that IFS_NWS/0 generates a word (at&t ksh
|
||
* doesn't do this, but POSIX does).
|
||
*/
|
||
if (word == IFS_WORD ||
|
||
(!ctype(c, C_IFSWS) && c && word == IFS_NWS)) {
|
||
char *p;
|
||
|
||
*dp++ = '\0';
|
||
p = Xclose(ds, dp);
|
||
if (fdo & DOBRACE_)
|
||
/* also does globbing */
|
||
alt_expand(wp, p, p,
|
||
p + Xlength(ds, (dp - 1)),
|
||
fdo | (f & DOMARKDIRS));
|
||
else if (fdo & DOGLOB)
|
||
glob(p, wp, f & DOMARKDIRS);
|
||
else if ((f & DOPAT) || !(fdo & DOMAGIC_))
|
||
XPput(*wp, p);
|
||
else
|
||
XPput(*wp, debunk(p, p, strlen(p) + 1));
|
||
fdo = 0;
|
||
saw_eq = 0;
|
||
tilde_ok = (f & (DOTILDE|DOASNTILDE)) ? 1 : 0;
|
||
if (c != 0)
|
||
Xinit(ds, dp, 128, ATEMP);
|
||
}
|
||
if (c == 0)
|
||
return;
|
||
if (word != IFS_NWS)
|
||
word = ctype(c, C_IFSWS) ? IFS_WS : IFS_NWS;
|
||
} else {
|
||
if (type == XSUB) {
|
||
if (word == IFS_NWS &&
|
||
Xlength(ds, dp) == 0) {
|
||
char *p;
|
||
|
||
if ((p = str_nsave(null, 0, ATEMP))
|
||
== NULL)
|
||
internal_errorf("unable "
|
||
"to allocate memory");
|
||
XPput(*wp, p);
|
||
}
|
||
type = XSUBMID;
|
||
}
|
||
|
||
/* age tilde_ok info - ~ code tests second bit */
|
||
tilde_ok <<= 1;
|
||
/* mark any special second pass chars */
|
||
if (!quote)
|
||
switch (c) {
|
||
case '[':
|
||
case NOT:
|
||
case '-':
|
||
case ']':
|
||
/* For character classes - doesn't hurt
|
||
* to have magic !,-,]s outside of
|
||
* [...] expressions.
|
||
*/
|
||
if (f & (DOPAT | DOGLOB)) {
|
||
fdo |= DOMAGIC_;
|
||
if (c == '[')
|
||
fdo |= f & DOGLOB;
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case '*':
|
||
case '?':
|
||
if (f & (DOPAT | DOGLOB)) {
|
||
fdo |= DOMAGIC_ | (f & DOGLOB);
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case OBRACE:
|
||
case ',':
|
||
case CBRACE:
|
||
if ((f & DOBRACE_) && (c == OBRACE ||
|
||
(fdo & DOBRACE_))) {
|
||
fdo |= DOBRACE_|DOMAGIC_;
|
||
*dp++ = MAGIC;
|
||
}
|
||
break;
|
||
case '=':
|
||
/* Note first unquoted = for ~ */
|
||
if (!(f & DOTEMP_) && !saw_eq &&
|
||
(Flag(FBRACEEXPAND) ||
|
||
(f & DOASNTILDE))) {
|
||
saw_eq = 1;
|
||
tilde_ok = 1;
|
||
}
|
||
break;
|
||
case ':': /* : */
|
||
/* Note unquoted : for ~ */
|
||
if (!(f & DOTEMP_) && (f & DOASNTILDE))
|
||
tilde_ok = 1;
|
||
break;
|
||
case '~':
|
||
/* tilde_ok is reset whenever
|
||
* any of ' " $( $(( ${ } are seen.
|
||
* Note that tilde_ok must be preserved
|
||
* through the sequence ${A=a=}~
|
||
*/
|
||
if (type == XBASE &&
|
||
(f & (DOTILDE|DOASNTILDE)) &&
|
||
(tilde_ok & 2)) {
|
||
const char *p;
|
||
char *dp_x;
|
||
|
||
dp_x = dp;
|
||
p = maybe_expand_tilde(sp,
|
||
&ds, &dp_x,
|
||
f & DOASNTILDE);
|
||
if (p) {
|
||
if (dp != dp_x)
|
||
word = IFS_WORD;
|
||
dp = dp_x;
|
||
sp = p;
|
||
continue;
|
||
}
|
||
}
|
||
break;
|
||
}
|
||
else
|
||
quote &= ~2; /* undo temporary */
|
||
|
||
if (make_magic) {
|
||
make_magic = 0;
|
||
fdo |= DOMAGIC_ | (f & DOGLOB);
|
||
*dp++ = MAGIC;
|
||
} else if (ISMAGIC(c)) {
|
||
fdo |= DOMAGIC_;
|
||
*dp++ = MAGIC;
|
||
}
|
||
*dp++ = c; /* save output char */
|
||
word = IFS_WORD;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Prepare to generate the string returned by ${} substitution.
|
||
*/
|
||
static int
|
||
varsub(Expand *xp, const char *sp, const char *word,
|
||
int *stypep, /* becomes qualifier type */
|
||
int *slenp) /* " " len (=, :=, etc.) valid iff *stypep != 0 */
|
||
{
|
||
int c;
|
||
int state; /* next state: XBASE, XARG, XSUB, XNULLSUB */
|
||
int stype; /* substitution type */
|
||
int slen;
|
||
const char *p;
|
||
struct tbl *vp;
|
||
|
||
if (sp[0] == '\0') /* Bad variable name */
|
||
return -1;
|
||
|
||
xp->var = NULL;
|
||
|
||
/* ${#var}, string length or array size */
|
||
if (sp[0] == '#' && (c = sp[1]) != '\0') {
|
||
int zero_ok = 0;
|
||
|
||
/* Can't have any modifiers for ${#...} */
|
||
if (*word != CSUBST)
|
||
return -1;
|
||
sp++;
|
||
/* Check for size of array */
|
||
if ((p = cstrchr(sp, '[')) && (p[1] == '*' || p[1] == '@') &&
|
||
p[2] == ']') {
|
||
int n = 0;
|
||
|
||
vp = global(arrayname(sp));
|
||
if (vp->flag & (ISSET|ARRAY))
|
||
zero_ok = 1;
|
||
for (; vp; vp = vp->u.array)
|
||
if (vp->flag & ISSET)
|
||
n++;
|
||
c = n;
|
||
} else if (c == '*' || c == '@')
|
||
c = e->loc->argc;
|
||
else {
|
||
p = str_val(global(sp));
|
||
zero_ok = p != null;
|
||
c = strlen(p);
|
||
}
|
||
if (Flag(FNOUNSET) && c == 0 && !zero_ok)
|
||
errorf("%s: parameter not set", sp);
|
||
*stypep = 0; /* unqualified variable/string substitution */
|
||
xp->str = shf_smprintf("%lu", (unsigned long)c);
|
||
return XSUB;
|
||
}
|
||
|
||
/* Check for qualifiers in word part */
|
||
stype = 0;
|
||
c = word[slen = 0] == CHAR ? word[1] : 0;
|
||
if (c == ':') {
|
||
slen += 2;
|
||
stype = 0x80;
|
||
c = word[slen + 0] == CHAR ? word[slen + 1] : 0;
|
||
}
|
||
if (!stype && c == '/') {
|
||
slen += 2;
|
||
stype = c;
|
||
if (word[slen] == ADELIM) {
|
||
slen += 2;
|
||
stype |= 0x80;
|
||
}
|
||
} else if (stype == 0x80 && (c == ' ' || c == '0')) {
|
||
stype |= '0';
|
||
} else if (ctype(c, C_SUBOP1)) {
|
||
slen += 2;
|
||
stype |= c;
|
||
} else if (ctype(c, C_SUBOP2)) { /* Note: ksh88 allows :%, :%%, etc */
|
||
slen += 2;
|
||
stype = c;
|
||
if (word[slen + 0] == CHAR && c == word[slen + 1]) {
|
||
stype |= 0x80;
|
||
slen += 2;
|
||
}
|
||
} else if (stype) /* : is not ok */
|
||
return -1;
|
||
if (!stype && *word != CSUBST)
|
||
return -1;
|
||
*stypep = stype;
|
||
*slenp = slen;
|
||
|
||
c = sp[0];
|
||
if (c == '*' || c == '@') {
|
||
switch (stype & 0x7f) {
|
||
case '=': /* can't assign to a vector */
|
||
case '%': /* can't trim a vector (yet) */
|
||
case '#':
|
||
return -1;
|
||
}
|
||
if (e->loc->argc == 0) {
|
||
xp->str = null;
|
||
xp->var = global(sp);
|
||
state = c == '@' ? XNULLSUB : XSUB;
|
||
} else {
|
||
xp->u.strv = (const char **) e->loc->argv + 1;
|
||
xp->str = *xp->u.strv++;
|
||
xp->split = c == '@'; /* $@ */
|
||
state = XARG;
|
||
}
|
||
} else {
|
||
if ((p = cstrchr(sp, '[')) && (p[1] == '*' || p[1] == '@') &&
|
||
p[2] == ']') {
|
||
XPtrV wv;
|
||
|
||
switch (stype & 0x7f) {
|
||
case '=': /* can't assign to a vector */
|
||
case '%': /* can't trim a vector (yet) */
|
||
case '#':
|
||
case '?':
|
||
return -1;
|
||
}
|
||
XPinit(wv, 32);
|
||
vp = global(arrayname(sp));
|
||
for (; vp; vp = vp->u.array) {
|
||
if (!(vp->flag&ISSET))
|
||
continue;
|
||
XPput(wv, str_val(vp));
|
||
}
|
||
if (XPsize(wv) == 0) {
|
||
xp->str = null;
|
||
state = p[1] == '@' ? XNULLSUB : XSUB;
|
||
XPfree(wv);
|
||
} else {
|
||
XPput(wv, 0);
|
||
xp->u.strv = (const char **) XPptrv(wv);
|
||
xp->str = *xp->u.strv++;
|
||
xp->split = p[1] == '@'; /* ${foo[@]} */
|
||
state = XARG;
|
||
}
|
||
} else {
|
||
/* Can't assign things like $! or $1 */
|
||
if ((stype & 0x7f) == '=' &&
|
||
ctype(*sp, C_VAR1 | C_DIGIT))
|
||
return -1;
|
||
xp->var = global(sp);
|
||
xp->str = str_val(xp->var);
|
||
state = XSUB;
|
||
}
|
||
}
|
||
|
||
c = stype&0x7f;
|
||
/* test the compiler's code generator */
|
||
if (ctype(c, C_SUBOP2) || stype == (0x80 | '0') || c == '/' ||
|
||
(((stype&0x80) ? *xp->str=='\0' : xp->str==null) ? /* undef? */
|
||
c == '=' || c == '-' || c == '?' : c == '+'))
|
||
state = XBASE; /* expand word instead of variable value */
|
||
if (Flag(FNOUNSET) && xp->str == null &&
|
||
(ctype(c, C_SUBOP2) || (state != XBASE && c != '+')))
|
||
errorf("%s: parameter not set", sp);
|
||
return state;
|
||
}
|
||
|
||
/*
|
||
* Run the command in $(...) and read its output.
|
||
*/
|
||
static int
|
||
comsub(Expand *xp, const char *cp)
|
||
{
|
||
Source *s, *sold;
|
||
struct op *t;
|
||
struct shf *shf;
|
||
|
||
s = pushs(SSTRING, ATEMP);
|
||
s->start = s->str = cp;
|
||
sold = source;
|
||
t = compile(s);
|
||
afree(s, ATEMP);
|
||
source = sold;
|
||
|
||
if (t == NULL)
|
||
return XBASE;
|
||
|
||
if (t != NULL && t->type == TCOM && /* $(<file) */
|
||
*t->args == NULL && *t->vars == NULL && t->ioact != NULL) {
|
||
struct ioword *io = *t->ioact;
|
||
char *name;
|
||
|
||
if ((io->flag&IOTYPE) != IOREAD)
|
||
errorf("funny $() command: %s",
|
||
snptreef(NULL, 32, "%R", io));
|
||
shf = shf_open(name = evalstr(io->name, DOTILDE), O_RDONLY, 0,
|
||
SHF_MAPHI|SHF_CLEXEC);
|
||
if (shf == NULL)
|
||
errorf("%s: cannot open $() input", name);
|
||
xp->split = 0; /* no waitlast() */
|
||
} else {
|
||
int ofd1, pv[2];
|
||
openpipe(pv);
|
||
shf = shf_fdopen(pv[0], SHF_RD, NULL);
|
||
ofd1 = savefd(1);
|
||
if (pv[1] != 1) {
|
||
ksh_dup2(pv[1], 1, false);
|
||
close(pv[1]);
|
||
}
|
||
execute(t, XFORK|XXCOM|XPIPEO);
|
||
restfd(1, ofd1);
|
||
startlast();
|
||
xp->split = 1; /* waitlast() */
|
||
}
|
||
|
||
xp->u.shf = shf;
|
||
return XCOM;
|
||
}
|
||
|
||
/*
|
||
* perform #pattern and %pattern substitution in ${}
|
||
*/
|
||
|
||
static char *
|
||
trimsub(char *str, char *pat, int how)
|
||
{
|
||
char *end = strnul(str);
|
||
char *p, c;
|
||
|
||
switch (how & 0xFF) {
|
||
case '#': /* shortest at beginning */
|
||
for (p = str; p <= end; p++) {
|
||
c = *p; *p = '\0';
|
||
if (gmatchx(str, pat, false)) {
|
||
*p = c;
|
||
return p;
|
||
}
|
||
*p = c;
|
||
}
|
||
break;
|
||
case '#'|0x80: /* longest match at beginning */
|
||
for (p = end; p >= str; p--) {
|
||
c = *p; *p = '\0';
|
||
if (gmatchx(str, pat, false)) {
|
||
*p = c;
|
||
return p;
|
||
}
|
||
*p = c;
|
||
}
|
||
break;
|
||
case '%': /* shortest match at end */
|
||
for (p = end; p >= str; p--) {
|
||
if (gmatchx(p, pat, false))
|
||
return str_nsave(str, p - str, ATEMP);
|
||
}
|
||
break;
|
||
case '%'|0x80: /* longest match at end */
|
||
for (p = str; p <= end; p++) {
|
||
if (gmatchx(p, pat, false))
|
||
return str_nsave(str, p - str, ATEMP);
|
||
}
|
||
break;
|
||
}
|
||
|
||
return str; /* no match, return string */
|
||
}
|
||
|
||
/*
|
||
* glob
|
||
* Name derived from V6's /etc/glob, the program that expanded filenames.
|
||
*/
|
||
|
||
/* XXX cp not const 'cause slashes are temporarily replaced with nulls... */
|
||
static void
|
||
glob(char *cp, XPtrV *wp, int markdirs)
|
||
{
|
||
int oldsize = XPsize(*wp);
|
||
|
||
if (glob_str(cp, wp, markdirs) == 0)
|
||
XPput(*wp, debunk(cp, cp, strlen(cp) + 1));
|
||
else
|
||
qsort(XPptrv(*wp) + oldsize, XPsize(*wp) - oldsize,
|
||
sizeof (void *), xstrcmp);
|
||
}
|
||
|
||
#define GF_NONE 0
|
||
#define GF_EXCHECK BIT(0) /* do existence check on file */
|
||
#define GF_GLOBBED BIT(1) /* some globbing has been done */
|
||
#define GF_MARKDIR BIT(2) /* add trailing / to directories */
|
||
|
||
/* Apply file globbing to cp and store the matching files in wp. Returns
|
||
* the number of matches found.
|
||
*/
|
||
int
|
||
glob_str(char *cp, XPtrV *wp, int markdirs)
|
||
{
|
||
int oldsize = XPsize(*wp);
|
||
XString xs;
|
||
char *xp;
|
||
|
||
Xinit(xs, xp, 256, ATEMP);
|
||
globit(&xs, &xp, cp, wp, markdirs ? GF_MARKDIR : GF_NONE);
|
||
Xfree(xs, xp);
|
||
|
||
return XPsize(*wp) - oldsize;
|
||
}
|
||
|
||
static void
|
||
globit(XString *xs, /* dest string */
|
||
char **xpp, /* ptr to dest end */
|
||
char *sp, /* source path */
|
||
XPtrV *wp, /* output list */
|
||
int check) /* GF_* flags */
|
||
{
|
||
char *np; /* next source component */
|
||
char *xp = *xpp;
|
||
char *se;
|
||
char odirsep;
|
||
|
||
/* This to allow long expansions to be interrupted */
|
||
intrcheck();
|
||
|
||
if (sp == NULL) { /* end of source path */
|
||
/* We only need to check if the file exists if a pattern
|
||
* is followed by a non-pattern (eg, foo*x/bar; no check
|
||
* is needed for foo* since the match must exist) or if
|
||
* any patterns were expanded and the markdirs option is set.
|
||
* Symlinks make things a bit tricky...
|
||
*/
|
||
if ((check & GF_EXCHECK) ||
|
||
((check & GF_MARKDIR) && (check & GF_GLOBBED))) {
|
||
#define stat_check() (stat_done ? stat_done : \
|
||
(stat_done = stat(Xstring(*xs, xp), &statb) < 0 \
|
||
? -1 : 1))
|
||
struct stat lstatb, statb;
|
||
int stat_done = 0; /* -1: failed, 1 ok */
|
||
|
||
if (lstat(Xstring(*xs, xp), &lstatb) < 0)
|
||
return;
|
||
/* special case for systems which strip trailing
|
||
* slashes from regular files (eg, /etc/passwd/).
|
||
* SunOS 4.1.3 does this...
|
||
*/
|
||
if ((check & GF_EXCHECK) && xp > Xstring(*xs, xp) &&
|
||
xp[-1] == '/' && !S_ISDIR(lstatb.st_mode) &&
|
||
(!S_ISLNK(lstatb.st_mode) ||
|
||
stat_check() < 0 || !S_ISDIR(statb.st_mode)))
|
||
return;
|
||
/* Possibly tack on a trailing / if there isn't already
|
||
* one and if the file is a directory or a symlink to a
|
||
* directory
|
||
*/
|
||
if (((check & GF_MARKDIR) && (check & GF_GLOBBED)) &&
|
||
xp > Xstring(*xs, xp) && xp[-1] != '/' &&
|
||
(S_ISDIR(lstatb.st_mode) ||
|
||
(S_ISLNK(lstatb.st_mode) && stat_check() > 0 &&
|
||
S_ISDIR(statb.st_mode)))) {
|
||
*xp++ = '/';
|
||
*xp = '\0';
|
||
}
|
||
}
|
||
XPput(*wp, str_nsave(Xstring(*xs, xp), Xlength(*xs, xp), ATEMP));
|
||
return;
|
||
}
|
||
|
||
if (xp > Xstring(*xs, xp))
|
||
*xp++ = '/';
|
||
while (*sp == '/') {
|
||
Xcheck(*xs, xp);
|
||
*xp++ = *sp++;
|
||
}
|
||
np = strchr(sp, '/');
|
||
if (np != NULL) {
|
||
se = np;
|
||
odirsep = *np; /* don't assume '/', can be multiple kinds */
|
||
*np++ = '\0';
|
||
} else {
|
||
odirsep = '\0'; /* keep gcc quiet */
|
||
se = sp + strlen(sp);
|
||
}
|
||
|
||
|
||
/* Check if sp needs globbing - done to avoid pattern checks for strings
|
||
* containing MAGIC characters, open [s without the matching close ],
|
||
* etc. (otherwise opendir() will be called which may fail because the
|
||
* directory isn't readable - if no globbing is needed, only execute
|
||
* permission should be required (as per POSIX)).
|
||
*/
|
||
if (!has_globbing(sp, se)) {
|
||
XcheckN(*xs, xp, se - sp + 1);
|
||
debunk(xp, sp, Xnleft(*xs, xp));
|
||
xp += strlen(xp);
|
||
*xpp = xp;
|
||
globit(xs, xpp, np, wp, check);
|
||
} else {
|
||
DIR *dirp;
|
||
struct dirent *d;
|
||
char *name;
|
||
int len;
|
||
int prefix_len;
|
||
|
||
/* xp = *xpp; copy_non_glob() may have re-alloc'd xs */
|
||
*xp = '\0';
|
||
prefix_len = Xlength(*xs, xp);
|
||
dirp = opendir(prefix_len ? Xstring(*xs, xp) : ".");
|
||
if (dirp == NULL)
|
||
goto Nodir;
|
||
while ((d = readdir(dirp)) != NULL) {
|
||
name = d->d_name;
|
||
if (name[0] == '.' &&
|
||
(name[1] == 0 || (name[1] == '.' && name[2] == 0)))
|
||
continue; /* always ignore . and .. */
|
||
if ((*name == '.' && *sp != '.') ||
|
||
!gmatchx(name, sp, true))
|
||
continue;
|
||
|
||
len = strlen(d->d_name) + 1;
|
||
XcheckN(*xs, xp, len);
|
||
memcpy(xp, name, len);
|
||
*xpp = xp + len - 1;
|
||
globit(xs, xpp, np, wp,
|
||
(check & GF_MARKDIR) | GF_GLOBBED
|
||
| (np ? GF_EXCHECK : GF_NONE));
|
||
xp = Xstring(*xs, xp) + prefix_len;
|
||
}
|
||
closedir(dirp);
|
||
Nodir:
|
||
;
|
||
}
|
||
|
||
if (np != NULL)
|
||
*--np = odirsep;
|
||
}
|
||
|
||
/* remove MAGIC from string */
|
||
char *
|
||
debunk(char *dp, const char *sp, size_t dlen)
|
||
{
|
||
char *d;
|
||
const char *s;
|
||
|
||
if ((s = cstrchr(sp, MAGIC))) {
|
||
if (s - sp >= (ssize_t)dlen)
|
||
return dp;
|
||
memcpy(dp, sp, s - sp);
|
||
for (d = dp + (s - sp); *s && (d - dp < (ssize_t)dlen); s++)
|
||
if (!ISMAGIC(*s) || !(*++s & 0x80) ||
|
||
!vstrchr("*+?@! ", *s & 0x7f))
|
||
*d++ = *s;
|
||
else {
|
||
/* extended pattern operators: *+?@! */
|
||
if ((*s & 0x7f) != ' ')
|
||
*d++ = *s & 0x7f;
|
||
if (d - dp < (ssize_t)dlen)
|
||
*d++ = '(';
|
||
}
|
||
*d = '\0';
|
||
} else if (dp != sp)
|
||
strlcpy(dp, sp, dlen);
|
||
return dp;
|
||
}
|
||
|
||
/* Check if p is an unquoted name, possibly followed by a / or :. If so
|
||
* puts the expanded version in *dcp,dp and returns a pointer in p just
|
||
* past the name, otherwise returns 0.
|
||
*/
|
||
static const char *
|
||
maybe_expand_tilde(const char *p, XString *dsp, char **dpp, int isassign)
|
||
{
|
||
XString ts;
|
||
char *dp = *dpp;
|
||
char *tp;
|
||
const char *r;
|
||
|
||
Xinit(ts, tp, 16, ATEMP);
|
||
/* : only for DOASNTILDE form */
|
||
while (p[0] == CHAR && p[1] != '/' && (!isassign || p[1] != ':'))
|
||
{
|
||
Xcheck(ts, tp);
|
||
*tp++ = p[1];
|
||
p += 2;
|
||
}
|
||
*tp = '\0';
|
||
r = (p[0] == EOS || p[0] == CHAR || p[0] == CSUBST) ?
|
||
tilde(Xstring(ts, tp)) : NULL;
|
||
Xfree(ts, tp);
|
||
if (r) {
|
||
while (*r) {
|
||
Xcheck(*dsp, dp);
|
||
if (ISMAGIC(*r))
|
||
*dp++ = MAGIC;
|
||
*dp++ = *r++;
|
||
}
|
||
*dpp = dp;
|
||
r = p;
|
||
}
|
||
return r;
|
||
}
|
||
|
||
/*
|
||
* tilde expansion
|
||
*
|
||
* based on a version by Arnold Robbins
|
||
*/
|
||
|
||
static char *
|
||
tilde(char *cp)
|
||
{
|
||
char *dp = null;
|
||
|
||
if (cp[0] == '\0')
|
||
dp = str_val(global("HOME"));
|
||
else if (cp[0] == '+' && cp[1] == '\0')
|
||
dp = str_val(global("PWD"));
|
||
else if (cp[0] == '-' && cp[1] == '\0')
|
||
dp = str_val(global("OLDPWD"));
|
||
#ifndef MKSH_NOPWNAM
|
||
else
|
||
dp = homedir(cp);
|
||
#endif
|
||
/* If HOME, PWD or OLDPWD are not set, don't expand ~ */
|
||
return (dp == null ? NULL : dp);
|
||
}
|
||
|
||
#ifndef MKSH_NOPWNAM
|
||
/*
|
||
* map userid to user's home directory.
|
||
* note that 4.3's getpw adds more than 6K to the shell,
|
||
* and the YP version probably adds much more.
|
||
* we might consider our own version of getpwnam() to keep the size down.
|
||
*/
|
||
static char *
|
||
homedir(char *name)
|
||
{
|
||
struct tbl *ap;
|
||
|
||
ap = ktenter(&homedirs, name, hash(name));
|
||
if (!(ap->flag & ISSET)) {
|
||
struct passwd *pw;
|
||
|
||
pw = getpwnam(name);
|
||
if (pw == NULL)
|
||
return NULL;
|
||
ap->val.s = str_save(pw->pw_dir, APERM);
|
||
ap->flag |= DEFINED|ISSET|ALLOC;
|
||
}
|
||
return ap->val.s;
|
||
}
|
||
#endif
|
||
|
||
static void
|
||
alt_expand(XPtrV *wp, char *start, char *exp_start, char *end, int fdo)
|
||
{
|
||
int count = 0;
|
||
char *brace_start, *brace_end, *comma = NULL;
|
||
char *field_start;
|
||
char *p;
|
||
|
||
/* search for open brace */
|
||
for (p = exp_start; (p = strchr(p, MAGIC)) && p[1] != OBRACE; p += 2)
|
||
;
|
||
brace_start = p;
|
||
|
||
/* find matching close brace, if any */
|
||
if (p) {
|
||
comma = NULL;
|
||
count = 1;
|
||
for (p += 2; *p && count; p++) {
|
||
if (ISMAGIC(*p)) {
|
||
if (*++p == OBRACE)
|
||
count++;
|
||
else if (*p == CBRACE)
|
||
--count;
|
||
else if (*p == ',' && count == 1)
|
||
comma = p;
|
||
}
|
||
}
|
||
}
|
||
/* no valid expansions... */
|
||
if (!p || count != 0) {
|
||
/* Note that given a{{b,c} we do not expand anything (this is
|
||
* what at&t ksh does. This may be changed to do the {b,c}
|
||
* expansion. }
|
||
*/
|
||
if (fdo & DOGLOB)
|
||
glob(start, wp, fdo & DOMARKDIRS);
|
||
else
|
||
XPput(*wp, debunk(start, start, end - start));
|
||
return;
|
||
}
|
||
brace_end = p;
|
||
if (!comma) {
|
||
alt_expand(wp, start, brace_end, end, fdo);
|
||
return;
|
||
}
|
||
|
||
/* expand expression */
|
||
field_start = brace_start + 2;
|
||
count = 1;
|
||
for (p = brace_start + 2; p != brace_end; p++) {
|
||
if (ISMAGIC(*p)) {
|
||
if (*++p == OBRACE)
|
||
count++;
|
||
else if ((*p == CBRACE && --count == 0) ||
|
||
(*p == ',' && count == 1)) {
|
||
char *new;
|
||
int l1, l2, l3;
|
||
|
||
l1 = brace_start - start;
|
||
l2 = (p - 1) - field_start;
|
||
l3 = end - brace_end;
|
||
new = (char *)alloc(l1 + l2 + l3 + 1, ATEMP);
|
||
memcpy(new, start, l1);
|
||
memcpy(new + l1, field_start, l2);
|
||
memcpy(new + l1 + l2, brace_end, l3);
|
||
new[l1 + l2 + l3] = '\0';
|
||
alt_expand(wp, new, new + l1,
|
||
new + l1 + l2 + l3, fdo);
|
||
field_start = p + 1;
|
||
}
|
||
}
|
||
}
|
||
return;
|
||
}
|