diff options
Diffstat (limited to 'toys')
| -rw-r--r-- | toys/pending/sh.c | 269 |
1 files changed, 263 insertions, 6 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c index dc4b774e..4697f081 100644 --- a/toys/pending/sh.c +++ b/toys/pending/sh.c @@ -217,6 +217,31 @@ static char *getvar(char *s) return getvarlen(s, strlen(s)); } + + +// returns pointer to next unquoted (or double quoted if dquot) char. +int skip_quote(char *s, int dquot, int *depth) +{ + int i, q = dquot ? *depth : 0; + + // quotes were checked for balance and overflow by parse_word() + for (i = 0; s[i]; i++) { + char c = s[i], qq = q ? toybuf[q-1] : 0; + + if (c == '\\') i++; + else if (qq!='\'' && c=='$' && s[1]=='(') { + toybuf[q++] = ')'; + i++; + } else if (q && qq==c) q--; + else if ((!q || qq==')') && (c=='"' || c=='\'' || c=='`')) toybuf[q++] = c; + else if (!q || (dquot && q==1 && qq=='"')) break; + } + + if (dquot) *depth = q; + + return i; +} + // quote removal, brace, tilde, parameter/variable, $(command), // $((arithmetic)), split, path #define NO_PATH (1<<0) @@ -225,6 +250,7 @@ static char *getvar(char *s) #define NO_TILDE (1<<3) #define NO_QUOTE (1<<4) #define FORCE_COPY (1<<31) +#define FORCE_KEEP (1<<30) // TODO: ${name:?error} causes an error/abort here (syntax_err longjmp?) // TODO: $1 $@ $* need args marshalled down here: function+structure? // arg = append to this @@ -232,18 +258,17 @@ static char *getvar(char *s) // flags = type of expansions (not) to do // delete = append new allocations to this so they can be freed later // TODO: at_args: $1 $2 $3 $* $@ -static void expand_arg(struct sh_arg *arg, char *old, unsigned flags, +static void expand_arg_nobrace(struct sh_arg *arg, char *old, unsigned flags, struct arg_list **delete) { - char *new = old, *s, *ss, quote = 0; + char *new = old; // TODO ls -l /proc/$$/fd -// ${ $(( $( $[ $' ` - // Tilde expansion if (!(flags&NO_TILDE) && *new == '~') { struct passwd *pw = 0; + char *s, *ss; // first expansion so don't need to free previous new ss = 0; @@ -260,6 +285,8 @@ static void expand_arg(struct sh_arg *arg, char *old, unsigned flags, new = xmprintf("%s%s", ss, s); } +// ${ $(( $( $[ $' ` " ' + /* while (*s) { if (!quote && !(flags&NO_BRACE) && *s == '{') { @@ -289,9 +316,9 @@ TODO this recurses } */ - // We have a result. Append it. + // Record result. if (old==new && (flags&FORCE_COPY)) new = xstrdup(new); - if (old!=new && delete) { + if ((old!=new || (flags&FORCE_KEEP)) && delete) { struct arg_list *al = xmalloc(sizeof(struct arg_list)); al->next = *delete; @@ -301,6 +328,231 @@ TODO this recurses array_add(&arg->v, arg->c++, new); } +// expand braces (ala {a,b,c}) and call expand_arg_nobrace() each permutation +static void expand_arg(struct sh_arg *arg, char *old, unsigned flags, + struct arg_list **delete) +{ + struct brace { + struct brace *next, *prev, *stack; +int debug; + int active, cnt, idx, commas[]; + } *bb = 0, *blist = 0, *bstk, *bnext; + int i, j; + char *s, *ss; + + // collect brace spans + if (!(flags&NO_BRACE)) for (i = 0; ; i++) { + if (!old[i += skip_quote(old+i, 0, 0)]) break; + if (old[i] == '{') { + dlist_add_nomalloc((void *)&blist, + (void *)(bb = xzalloc(sizeof(struct brace)+34*4))); +dprintf(2, "{%p@%d %c\n", bb, i, bb->debug = old[i+1]); + bb->commas[0] = i; + } else if (!bb) continue; + else if (bb && old[i] == ',') { +dprintf(2, ",%p@%d\t%c\n", bb, i, old[i+1]); + if (bb->cnt && !(bb->cnt&31)) { + dlist_lpop(&blist); + dlist_add_nomalloc((void *)&blist, + (void *)(bb = xrealloc(bb, sizeof(struct brace)+(bb->cnt+34)*4))); + } + bb->commas[++bb->cnt] = i; +dprintf(2, "cnt %c %d\n", bb->debug, bb->cnt); + } else if (bb && old[i] == '}') { + bb->active = bb->commas[bb->cnt+1] = i; + for (bnext = bb; bb && bb->active; bb = (bb==blist)?0:bb->prev); +dprintf(2, "}[%d]%p@%d\n", bnext->cnt, bb, i); + // discard commaless brace + if (!bnext->cnt) free((blist == bnext) ? dlist_pop(&blist) : bnext); + } + } + +// TODO NOSPLIT with braces? (Collate with spaces?) + // If none, pass on verbatim + if (!blist) return expand_arg_nobrace(arg, old, flags, delete); + +dprintf(2, "got here\n"); +for (bstk = blist; bstk; bstk = (bstk->next == blist) ? 0 : bstk->next) { + dprintf(2, "murf %c %d %p", bstk->debug, bstk->cnt, bstk); + for (i = 0; i<=bstk->cnt+1; i++) dprintf(2, " %d", bstk->commas[i]); + dprintf(2, "\n"); +} + +// span from "{ to }" or ", to }" or "{ to ," uninterrupted by other spans +// span from "{ to {" or ", to {" or "start to {" +// span from "} to }" or "} to ," or "} to end" +// span from } to { + +/* +A prefix - because new { with no parent + B prefix - becaue new - in comma span + C span - because next after this comma span + E suffix - because next after this comma span + skipped comma span + J sibling - + K span - +*/ + +//the problem is we need previous bstk at _same_ level when sibling. +//postprocess bb to next, so can't be _here. + +// span is active if ~parent or in parent's active comma span + + // enclose entire range in top level brace. + (bstk = xzalloc(sizeof(struct brace)+8))->commas[1] = strlen(old)+1; + bstk->commas[0] = -1; + + // loop through each combination + for (;;) { + +dprintf(2, "combination"); +for (bb = blist; bb; bb = (bb->next == blist) ? 0 : bb->next) + dprintf(2, " %c %d", bb->debug, bb->idx); +dprintf(2, "\n"); + + // Brace expansion can't be longer than original string. Keep start to { + s = ss = xmalloc(bstk->commas[1]); + + // Append output from active braces (in "saved" list) + for (bb = blist; bb;) { +dprintf(2, "--- start loop span %c stk %c\n", bb->debug, bstk->debug); + // keep prefix and push self onto stack + if (bstk == bb) bstk = bstk->stack; // pop self + i = bstk->commas[bstk->idx]+1; +dprintf(2, "idx=%d i=%d o=%d cc=%d\n", bb->idx, i, bb->commas[0], bstk->commas[bstk->cnt+1]); + if (bstk->commas[bstk->cnt+1]>bb->commas[0]) + s = stpncpy(s, old+i, bb->commas[0]-i); + +//murgle this is wrong for post-sibling span +//how to distinguish enclosing stack from left sibling? + +//murgle: _end_ of previous segment stack output, not start. +//but enclosing one had no comma, so no end? +dprintf(2, "========%ld %.*s prefix for %c\n", s-ss, (int)(s-ss), ss, bb->debug); + // pop sibling + if (bstk->commas[bstk->cnt+1]<bb->commas[0]) { +dprintf(2, "sibling pop %c to %c\n", bstk->debug, bstk->stack->debug); + bstk = bstk->stack; +} + + bb->stack = bstk; // push + bb->active = 1; + bstk = bnext = bb; +dprintf(2, "pushed %c\n", bb->debug); +dprintf(2, "bnext %p\n",bnext); + // skip inactive spans from earlier or later commas + while ((bnext = (bnext->next==blist) ? 0 : bnext->next)) { +dprintf(2, "bnext %p\n", bnext); +dprintf(2, "maybe %c %d %d\n", bnext->debug, bnext->commas[0], bb->commas[bb->idx]); + i = bnext->commas[0]; + // past end of this brace + if (i>bb->commas[bb->cnt+1]) { +dprintf(2, "exit 1 %d %d\n", i, bb->commas[bb->cnt+1]); + break; +} +dprintf(2, "bnext=%c\n", bnext->debug); + // in this brace but not this selection + if (i<bb->commas[bb->idx] || i>bb->commas[bb->idx+1]) { + bnext->active = 0; + bnext->stack = 0; + // in this selection! + } else { +dprintf(2, "exit 2\n"); + break; +} +dprintf(2, "skipped %c because %d < %d\n", bnext->debug, bnext->commas[0], bb->commas[bb->idx]); + } +dprintf(2, "bnext now %p\n", bnext); +if (bnext) dprintf(2, "bnext=%c\n", bnext->debug); + // is next span past this range? +if (bnext) dprintf(2, "bnexts=%c %c %d %d\n", bnext->debug, bb->debug, bnext->commas[0], bb->commas[bb->idx]+1); + if (!bnext || bnext->commas[0]>bb->commas[bb->idx+1]) { +dprintf(2, "span %d\n", bstk->idx); + // output uninterrupted span + i = bb->commas[bstk->idx]+1; + s = stpncpy(s, old+i, bb->commas[bb->idx+1]-i); +dprintf(2, "span output %d %d\n", i, bstk->commas[bstk->idx+1]); +dprintf(2, "=======2=%ld %.*s span for %c\n", s-ss, (int)(s-ss), ss, bstk->debug); + + // While not sibling, output tail and pop + while (!bnext || bnext->commas[0] > bstk->commas[bstk->cnt+1]) { +dprintf(2, "bstk=%p bnext=%p\n", bstk, bnext); +if (bnext) dprintf(2, "pop %c vs %c because %d > %d\n", bstk->debug, bnext->debug, bnext->commas[0], bstk->commas[bstk->cnt+1]); + if (!(bb = bstk->stack)) break; + +/* + ok, failing active span is e,f: 4th span, print nothing after it (20,20) + first 20: 4[cnt+1], second 20: 1[idx+1] + j=1[idx+1]-i=4[cnt+1] +*/ + +if (bnext) dprintf(2, "parent %c next %c\n", bb->debug, bnext->debug); + i = bstk->commas[bstk->cnt+1]+1; // start of span + j = bb->commas[bb->idx+1]; // enclosing comma span +char *typetype = "tail"; +dprintf(2, "what j=%d bb->idx=%d\n", j, bb->idx); +dprintf(2, "bnext %c %d %d\n", bnext ? bnext->debug : '.', bnext ? bnext->commas[0] : 0, bnext ? bnext->commas[1] : 0); +if (bnext) dprintf(2, "j=%d or j=%d\n", j, bnext->commas[0]); + +if (bnext) dprintf(2, "%c vs %c %d %d\n", bnext->debug, bstk->debug, bnext->commas[0], bstk->stack->commas[bstk->stack->cnt+1]); + while (bnext) { + if (bnext->commas[0]<j) { + j = bnext->commas[0];// sibling + break; +typetype="sibling"; + } else if (bb->commas[bb->cnt+1]>bnext->commas[0]) + bnext = (bnext->next == blist) ? 0 : bnext->next; + else break; +if (bnext) dprintf(2, "bnext=%c %c nc=%d bbc=%d\n", bnext->debug, bb->debug, bnext->commas[0], bb->commas[bb->cnt+1]); + } +dprintf(2, "emit %d to %d\n", i, j); + s = stpncpy(s, old+i, j-i); +dprintf(2, "=======3=%ld %.*s suffix for %c is %s\n", s-ss, (int)(s-ss), ss, bstk->debug, typetype); + + // if next is sibling but parent _not_ a sibling, don't pop + if (bnext && bnext->commas[0]<bstk->stack->commas[bstk->stack->cnt+1]) + break; + +dprintf(2, "pop %c", bstk->debug); + bstk = bstk->stack; +dprintf(2, " now %c with %p\n", bstk ? bstk->debug : '.', bnext); + } +dprintf(2, "out\n"); + } +if (bb && bnext) dprintf(2, "advance %c to %c (%c)\n", bb->debug, bnext->debug, blist->debug); + bb = (bnext == blist) ? 0 : bnext; +dprintf(2, "down\n"); + } +dprintf(2, "increment\n"); + // increment + + +//dprintf(1, "ss=%s\n", ss); + expand_arg_nobrace(arg, ss, flags|FORCE_KEEP, delete); + + for (bb = blist->prev; bb; bb = (bb == blist) ? 0 : bb->prev) { +dprintf(2, "inky %c %p\n", bb->debug, bb->stack); + if (!bb->stack) { +dprintf(2, "skip\n"); + continue; +} + else if (++bb->idx > bb->cnt) { +dprintf(2, "roll bb->idx=%d bb->cnt=%d\n", bb->idx, bb->cnt); + bb->idx = 0; +} + else { +dprintf(2, "Incremented %c to %d\n", bb->debug, bb->idx); + break; +} + } + if (!bb) { + llist_traverse(blist, free); + return; + } + } +} + + // Expand exactly one arg, returning NULL if it split. // If return != new you need to free it. static char *expand_one_arg(char *new, unsigned flags, struct arg_list **del) @@ -1646,6 +1898,11 @@ void sh_main(void) TT.hfd = 10; signal(SIGPIPE, SIG_IGN); + // Ensure environ copied and toys.envc set + xunsetenv(""); + + // TODO: traverse and unset illegal environment variables named "$" and such + // TODO euid stuff? // TODO read profile, read rc |