diff options
author | Rob Landley <rob@landley.net> | 2020-09-27 01:18:54 -0500 |
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committer | Rob Landley <rob@landley.net> | 2020-09-27 01:18:54 -0500 |
commit | 8a25a5b0eae4c979c94c253b28e03a0765c1be0c (patch) | |
tree | 4fe6526a05739f47fafee788f09564027749ea5a /toys/pending | |
parent | 0d73d98537e4c058537ffa735b8592d1a89a1028 (diff) | |
download | toybox-8a25a5b0eae4c979c94c253b28e03a0765c1be0c.tar.gz |
Implement wildcard match plumbing. (Not yet fully debugged.)
Diffstat (limited to 'toys/pending')
-rw-r--r-- | toys/pending/sh.c | 309 |
1 files changed, 253 insertions, 56 deletions
diff --git a/toys/pending/sh.c b/toys/pending/sh.c index 2fe47b47..cf4d6165 100644 --- a/toys/pending/sh.c +++ b/toys/pending/sh.c @@ -176,7 +176,7 @@ GLOBALS( // keep lineno here: used to work around compiler limitation in run_command() long lineno; - char *ifs, *isexec; + char *ifs, *isexec, *wcpat; unsigned options, jobcnt; int hfd, pid, bangpid, varslen, shift, cdcount; long long SECONDS; @@ -211,7 +211,8 @@ GLOBALS( struct sh_arg *raw, arg; } *pp; // currently running process - struct sh_arg jobs, *arg; // job list, command line args for $* etc + // job list, command line for $*, scratch space for do_wildcard_files() + struct sh_arg jobs, *arg, *wcdeck; ) // Can't yet avoid this prototype. Fundamental problem is $($($(blah))) nests, @@ -460,11 +461,11 @@ static char *declarep(struct sh_vars *var) for (in = types = varend(var->str); *in; in++) len += !!strchr("$\"\\`", *in); len += in-types; - ss = xmalloc(len+13); + ss = xmalloc(len+15); out = ss + sprintf(ss, "declare -%s \"", out); - while (types) { - if (strchr("$\"\\`", *in)) *out++ = '\\'; + while (*types) { + if (strchr("$\"\\`", *types)) *out++ = '\\'; *out++ = *types++; } *out++ = '"'; @@ -605,7 +606,7 @@ static int next_hfd() for (; TT.hfd<=99999; TT.hfd++) if (-1 == fcntl(TT.hfd, F_GETFL)) break; hfd = TT.hfd; - if (TT.hfd > 99999) { + if (TT.hfd>99999) { hfd = -1; if (!errno) errno = EMFILE; } @@ -828,29 +829,177 @@ char *slashcopy(char *s, char c) return ss; } -// Return 0 fail, 1 short match, 2 exact match -static int wildcard_match(char *str, char *pattern, struct sh_arg *deck) +int getutf8(char *s, int len, int *cc) { - int i; + wchar_t wc; -// TODO actual plumbing here - for (i = 0; str[i]; i++) if (str[i]!=pattern[i]) return 0; + if (len<0) wc = len = 0; + else if (1>(len = utf8towc(&wc, s, len))) wc = *s, len = 1; + if (cc) *cc = wc; - return 1+!pattern[i]; + return len; } -// wildcard expand data and add results to arg list -static void wildcard_add(struct sh_arg *arg, char *pattern, struct sh_arg *deck, - struct arg_list **delete) +#define WILD_SHORT 1 // else longest match +#define WILD_CASE 2 // case insensitive +// Returns length of str matched by pattern, or -1 if not all pattern consumed +static int wildcard_match(char *str, int len, char *pattern, int plen, + struct sh_arg *deck, int flags) { -// TODO: abc/*/def.txt in segments, partial matches - arg_add(arg, pattern); -// TODO when flush deck? + struct sh_arg ant = {0}; // stack: of str offsets + long ss, pp, dd, best = -1; + int i, j, c, not; + + // Loop through wildcards in pattern. + for (ss = pp = dd = 0; ;pp++) { + // did we consume pattern? + if (pp==plen) { + if (ss>best) best = ss; + if (ss==len || (flags&WILD_SHORT)) break; + // attempt literal match? + } else if (dd>=deck->c || pp!=(long)deck->v[dd]) { + if (ss<len) { + if (flags&WILD_CASE) { + c = towupper(getutf8(str+ss, len-ss, &i)); + ss += i; + i = towupper(getutf8(pattern+pp, pp-plen, &j)); + pp += j; + } else c = str[ss++], i = pattern[pp++]; + if (c==i) continue; + } + + // Wildcard chars: |+@!*?()[] + } else if ((c = pattern[(long)deck->v[dd++]])=='?') { + ss += (i = getutf8(str+ss, len-ss, 0)); + if (i) continue; + } else if (c == '*') { + // start with zero length match, don't record consecutive ** + if (!dd || pp-1!=(long)deck->v[dd-1] || pattern[pp-1]!='*') { + arg_add(&ant, (void *)ss); + arg_add(&ant, 0); + dd++; + } + + continue; + } else if (c == '[') { + not = !!strchr("!^", pattern[++pp]); + ss += getutf8(str+ss, len-ss, &c); + for (i = 0, pp += not; pp<(long)deck->v[dd]; i = 0) { + pp += getutf8(pattern+pp, plen-pp, &i); + if (pattern[pp]=='-') { + ++pp; + pp += getutf8(pattern+pp, plen-pp, &j); + if (not^(i<=c && j>=c)) break; + } else if (not^(i==c)) break; + } + if (i) { + pp = (long)deck->v[dd++]; + + continue; + } + + // ( preceded by +@!*? + + } else { // TODO ( ) | + dd++; + continue; + } + + // match failure, pop retry stack or return failure + // TODO: seek to next | in paren + while (ant.c) { + if ((c = pattern[(long)deck->v[--dd]])=='*') { + if (len<(ss = (long)ant.v[ant.c-2]+ (long)++ant.v[ant.c-1])) ant.c -= 2; + else { + dd++; + break; + } + } else if (c == '(') dprintf(2, "TODO: ("); + } + + if (!ant.c) break; + } + + free (ant.v); + + return best; +} + +// Skip to next slash in wildcard path. Needs deck to know what [ranges] to skip +char *wildcard_skipslash(char *pattern, struct sh_arg *deck, int *doff) +{ + char *p; + int i = 0; + + for (p = pattern; *p && *p!='/'; p++) { + // Skip [] and nested () ranges within deck + if (*doff<deck->c && p-pattern == (long)deck->v[*doff]) { + ++*doff; + if (*p=='[') p = deck->v[(*doff)++]; + else if (*p=='(') while (*++p) if (p-pattern == (long)deck->v[*doff]) { + ++*doff; + if (*p == ')') { + if (!i) break; + i--; + } else if (*p == '(') i++; + } + } + } + + return p; +} + +// TODO ** means this directory as well as ones below it, shopt -s globstar + +// Filesystem traversal callback +// pass on: filename, portion of deck, portion of pattern, +// input: pattern+offset, deck+offset. Need to update offsets. +int do_wildcard_files(struct dirtree *node) +{ + struct dirtree *nn; + char *p, *pattern = TT.wcpat; + int lvl, ll, rc; + struct sh_arg ant; + + // Find active pattern range + for (nn = node, lvl = ll = 1;; lvl = ll, pattern = p) { + p = wildcard_skipslash(pattern, TT.wcdeck, &ll); + if (lvl != ll && !(nn = nn->parent)) break; + while (*p == '/') p++; + } + + // Don't include . entries unless explicitly asked for them + if (*node->name == '.' && *pattern != '.') return 0; + + // Don't descend into non-directory (called with DIRTREE_SYMFOLLOW) + if (*p && !S_ISDIR(node->st.st_mode) && *node->name) return 0; + + // match this filename from pattern to p in deck from lvl to ll + ant.c = ll-lvl; + ant.v = TT.wcdeck->v+lvl; + rc = wildcard_match(node->name, strlen(node->name), pattern,p-pattern,&ant,0); + if (rc<0 || node->name[rc]) return 0; + + // We matched: recurse or save + if (!*p) return DIRTREE_SAVE; + lvl = ll; + pattern = p; + while (*p && lvl == ll) { + p = wildcard_skipslash(p, TT.wcdeck, &ll); + while (*p == '/') p++; + } + if (lvl == ll) { + p = xmprintf("%s%s", node->name, pattern); + rc = faccessat(dirtree_parentfd(node), p, F_OK, AT_SYMLINK_NOFOLLOW); + free(p); + return DIRTREE_SAVE*!rc; + } + + return DIRTREE_RECURSE; } // Record active wildcard chars in output string // *new start of string, oo offset into string, deck is found wildcards, -// ant is scratch space for nested +() static void collect_wildcards(char *new, long oo, struct sh_arg *deck) { long bracket, *vv; @@ -861,44 +1010,49 @@ static void collect_wildcards(char *new, long oo, struct sh_arg *deck) if (!deck->c) arg_add(deck, 0); vv = (long *)deck->v; - // Start +( range, or remove first char that isn't wildcard without ( - if (deck->c>1 && vv[deck->c-1] == oo-1 && strchr("+@!*?", new[oo-1])) { - if (cc == '(') { - vv[deck->c-1] = oo; - return; - } else if (!strchr("*?", new[oo-1])) deck->c--; - } + // vv[0] used for paren level (bottom 16 bits) + bracket start offset<<16 - // yank unifinished ( ranges from metadata, they're not live wildcards + // at end loop backwards through live wildcards to remove pending unmatched ( if (!cc) { - long ii = 0, jj = 65535&*vv; + long ii = 0, jj = 65535&*vv, kk; - for (oo = deck->c; jj;) { - cc = new[vv[--oo]]; - if (')' == cc) ii++; + for (*vv = 0, kk = deck->c; jj;) { + if (')' == (cc = new[vv[--kk]])) ii++; else if ('(' == cc) { if (ii) ii--; else { - memmove(vv+oo, vv+oo+1, sizeof(long)*(deck->c-- -oo)); + memmove(vv+kk, vv+kk+1, sizeof(long)*(deck->c-- -kk)); jj--; } } } return; - } else if (strchr("|+@!*?", cc)); - // Pop parentheses stack + } + + // Start +( range, or remove first char that isn't wildcard without ( + if (deck->c>1 && vv[deck->c-1] == oo-1 && strchr("+@!*?", new[oo-1])) { + if (cc == '(') { + vv[deck->c-1] = oo; + return; + } else if (!strchr("*?", new[oo-1])) deck->c--; + } + + // fall through to add wildcard, popping parentheses stack as necessary + if (strchr("|+@!*?", cc)); else if (cc == ')' && (65535&*vv)) --*vv; - // If we complete a [range] discard any other wildcards within, add [ and ] + // complete [range], discard wildcards within, add [, fall through to add ] else if (cc == ']' && (bracket = *vv>>16)) { - if (bracket == oo || (bracket+1 == oo && new[oo-1] == '^')) return; + // don't end range yet for [] or [^] + if (bracket+1 == oo || (bracket+2 == oo && strchr("!^", new[oo-1]))) return; while (deck->c>1 && vv[deck->c-1]>=bracket) deck->c--; *vv &= 65535; arg_add(deck, (void *)--bracket); - // [ is speculative, don't add to deck yet, just record we saw it + // Not a wildcard } else { + // [ is speculative, don't add to deck yet, just record we saw it if (cc == '[' && !(*vv>>16)) *vv = (oo<<16)+(65535&*vv); return; } @@ -907,6 +1061,51 @@ static void collect_wildcards(char *new, long oo, struct sh_arg *deck) arg_add(deck, (void *)oo); } +// wildcard expand data against filesystem, and add results to arg list +// Note: this wildcard deck has extra argument at start (leftover from parsing) +static void wildcard_add_files(struct sh_arg *arg, char *pattern, + struct sh_arg *deck, struct arg_list **delete) +{ + struct dirtree *dt; + char *p, *pp; + int lvl, ll; + + // fast path: when no wildcards, add pattern verbatim + if (deck->c<2) return arg_add(arg, pattern); + + if (*deck->v) collect_wildcards("", 0, deck); + TT.wcdeck = deck; + TT.wcpat = pattern; + + // Find leading patternless path (if any) + for (p = pattern, lvl = ll = 1; ; p = pp) { + pp = wildcard_skipslash(p, deck, &ll); + if (ll != lvl) break; + while (*pp == '/') pp++; + } + + // Traverse + pp = 0; + dt = dirtree_flagread((p==pattern) ? 0 : (pp = xstrndup(pattern, p-pattern)), + DIRTREE_STATLESS|DIRTREE_SYMFOLLOW, do_wildcard_files); + free(pp); + + if (!dt) return arg_add(arg, pattern); + + // traverse dirtree via child and parent pointers, consuming/freeing nodes + while (dt) { + while (dt->child) dt = dt->child; + arg_add(arg, dirtree_path(dt, 0)); + do { + pp = (void *)dt; + if ((dt = dt->parent)) dt->child = dt->child->next; + free(pp); + } while (dt && !dt->child); + } + +// TODO: test .*/../ +} + #define NO_QUOTE (1<<0) // quote removal #define NO_PATH (1<<1) // path expansion (wildcards) #define NO_SPLIT (1<<2) // word splitting @@ -957,11 +1156,10 @@ if (BUGBUG) dprintf(255, "expand %s\n", str); struct sh_arg aa = {0}; int nosplit = 0; - if (!(flags&NO_PATH) && !(qq&1)) collect_wildcards(new, oo, ant); - // skip literal chars if (!strchr("'\"\\$`"+2*(flags&NO_QUOTE), cc)) { if (str != new) new[oo] = cc; + if (!(flags&NO_PATH) && !(qq&1)) collect_wildcards(new, oo, ant); oo++; continue; } @@ -975,7 +1173,7 @@ if (BUGBUG) dprintf(255, "expand %s\n", str); // handle escapes and quoting if (cc == '\\') { - if (!(qq&1) || strchr("\"\\$`", str[ii])) + if (!(qq&1) || (str[ii] && strchr("\"\\$`", str[ii]))) new[oo++] = str[ii] ? str[ii++] : cc; } else if (cc == '"') qq++; else if (cc == '\'') { @@ -1236,7 +1434,7 @@ barf: if (qq || ss!=ifs) { if (!(flags&NO_PATH)) for (jj = 0; ifs[jj]; jj++) collect_wildcards(ifs, jj, ant); - wildcard_add(arg, ifs, &deck, delete); + wildcard_add_files(arg, ifs, &deck, delete); } continue; } @@ -1255,7 +1453,7 @@ barf: if (!nosplit) { if (qq || *new || *ss) { push_arg(delete, new = xrealloc(new, strlen(new)+1)); - wildcard_add(arg, new, &deck, delete); + wildcard_add_files(arg, new, &deck, delete); new = xstrdup(str+ii); } qq &= 1; @@ -1281,7 +1479,7 @@ barf: // Record result. if (*new || qq) { if (str != new) push_arg(delete, new); - wildcard_add(arg, new, &deck, delete); + wildcard_add_files(arg, new, &deck, delete); new = 0; } @@ -2616,26 +2814,24 @@ dprintf(2, "TODO skipped init for((;;)), need math parser\n"); } else if (strcmp(s, ";&")) { struct sh_arg arg = {0}, arg2 = {0}; - for (err = 0, vv = 0; !err;) { + for (err = 0, vv = 0;;) { if (!vv) { vv = pl->arg->v + (**pl->arg->v == ';'); if (!*vv) { - pl = pl->next; -// TODO if not type==3 syntax err here, but catch it above - + pl = pl->next; // TODO syntax err if not type==3, catch above break; } else vv += **vv == '('; } arg.c = 0; - if (expand_arg_nobrace(&arg, *vv++, NO_PATH|NO_SPLIT, &blk->fdelete, - &arg2)) err = 1; - else { - match = wildcard_match(arg.c ? *arg.v : "", blk->fvar, &arg2); - if (match == 2) break; - else if (**vv++ == ')') { - vv = 0; - if ((pl = pl->end)->type!=2) break; - } + if ((err = expand_arg_nobrace(&arg, *vv++, NO_PATH|NO_SPLIT, + &blk->fdelete, &arg2))) break; + s = arg.c ? *arg.v : ""; + match = wildcard_match(s, strlen(s), blk->fvar, strlen(blk->fvar), + &arg2, 0); + if (match<0 || s[match]) break; + else if (**vv++ == ')') { + vv = 0; + if ((pl = pl->end)->type!=2) break; } } free(arg.v); @@ -3149,6 +3345,7 @@ void exec_main(void) // report error (usually ENOENT) and return perror_msg("%s", TT.isexec); + if (*toys.optargs != TT.isexec) free(*toys.optargs); TT.isexec = 0; toys.exitval = 127; environ = old; |