diff options
author | Peter Rajnoha <prajnoha@redhat.com> | 2014-04-28 11:57:09 +0200 |
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committer | Peter Rajnoha <prajnoha@redhat.com> | 2014-05-09 08:51:00 +0200 |
commit | b73c961d5a9f7a74e4ebf17986868c2f0b1e71c4 (patch) | |
tree | 129cbaf7896bb2c1e505d7e4091f345abaa5b0f0 | |
parent | 55a278edb71f3fbe9b2c77e5106cea14e66e1b39 (diff) | |
download | lvm2-b73c961d5a9f7a74e4ebf17986868c2f0b1e71c4.tar.gz |
selout: add dm_report_set_output_selection to libdm
-rw-r--r-- | libdm/libdevmapper.h | 2 | ||||
-rw-r--r-- | libdm/libdm-report.c | 401 |
2 files changed, 394 insertions, 9 deletions
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h index f5a1cc7bc..1acc00ead 100644 --- a/libdm/libdevmapper.h +++ b/libdm/libdevmapper.h @@ -1638,6 +1638,8 @@ struct dm_report *dm_report_init(uint32_t *report_types, const char *sort_keys, void *private_data); int dm_report_object(struct dm_report *rh, void *object); +int dm_report_set_output_selection(struct dm_report *rh, uint32_t *report_types, + const char *selection); int dm_report_output(struct dm_report *rh); void dm_report_free(struct dm_report *rh); diff --git a/libdm/libdm-report.c b/libdm/libdm-report.c index 150022b1b..b4c5d27bf 100644 --- a/libdm/libdm-report.c +++ b/libdm/libdm-report.c @@ -48,6 +48,8 @@ struct dm_report { /* To store caller private data */ void *private; + + struct selection_node *selection_root; }; /* @@ -488,6 +490,23 @@ static int _add_all_fields(struct dm_report *rh, uint32_t type) return 1; } +static int _get_field(struct dm_report *rh, const char *field, size_t flen, uint32_t *f_ret) +{ + uint32_t f; + + if (!flen) + return 0; + + for (f = 0; rh->fields[f].report_fn; f++) { + if (_is_same_field(rh->fields[f].id, field, flen, rh->field_prefix)) { + *f_ret = f; + return 1; + } + } + + return 0; +} + static int _field_match(struct dm_report *rh, const char *field, size_t flen, unsigned report_type_only) { @@ -496,15 +515,13 @@ static int _field_match(struct dm_report *rh, const char *field, size_t flen, if (!flen) return 0; - for (f = 0; rh->fields[f].report_fn; f++) - if (_is_same_field(rh->fields[f].id, field, flen, - rh->field_prefix)) { - if (report_type_only) { - rh->report_types |= rh->fields[f].type; - return 1; - } else - return _add_field(rh, f, 0) ? 1 : 0; - } + if ((_get_field(rh, field, flen, &f))) { + if (report_type_only) { + rh->report_types |= rh->fields[f].type; + return 1; + } else + return _add_field(rh, f, 0) ? 1 : 0; + } if ((type = _all_match(rh, field, flen))) { if (report_type_only) { @@ -1047,7 +1064,373 @@ static const char *_tok_field_name(const char *s, return s; } +static struct field_selection *_create_field_selection(struct dm_report *rh, + uint32_t field_num, + const char *v, + size_t len, + uint64_t factor, + uint32_t flags) +{ + static const char *_out_of_range_msg = "Field selection value %s out of supported range."; + struct field_properties *fp, *found = NULL; + struct field_selection *fs; + char *s; + dm_list_iterate_items(fp, &rh->field_props) { + if (fp->field_num == field_num) { + found = fp; + break; + } + } + + /* The field is neither used in display options nor sort keys. */ + if (!found) { + if (!(found = _add_field(rh, field_num, FLD_HIDDEN))) + return NULL; + rh->report_types |= rh->fields[field_num].type; + } + + if (!(found->flags & flags & DM_REPORT_FIELD_TYPE_MASK)) { + log_error("dm_report: Incompatible comparison type"); + return NULL; + } + + /* set up selection */ + if (!(fs = dm_pool_zalloc(rh->mem, sizeof(struct field_selection)))) { + log_error("dm_report: struct field_selection allocation failed"); + return NULL; + } + fs->fp = found; + fs->flags = flags; + + /* store comparison operand */ + if (flags & FLD_CMP_REGEX) { + /* REGEX */ + if (!(s = dm_malloc(len + 1))) { + log_error("dm_report: dm_malloc failed"); + goto error; + } + memcpy(s, v, len); + s[len] = '\0'; + + fs->v.r = dm_regex_create(rh->mem, + (const char **) &s, 1); + dm_free(s); + if (!fs->v.r) { + log_error("dm_report: failed to create matcher"); + goto error; + } + } else { + /* STRING, NUMBER or SIZE */ + if (!(s = dm_pool_alloc(rh->mem, len + 1))) { + log_error("dm_report: dm_pool_alloc failed"); + goto error; + } + memcpy(s, v, len); + s[len] = '\0'; + + switch (flags & DM_REPORT_FIELD_TYPE_MASK) { + case DM_REPORT_FIELD_TYPE_STRING: + fs->v.s = s; + break; + case DM_REPORT_FIELD_TYPE_NUMBER: + if (((fs->v.i = strtoull(s, NULL, 10)) == ULLONG_MAX) && + (errno == ERANGE)) { + log_error(_out_of_range_msg, s); + goto error; + } + dm_pool_free(rh->mem, s); + break; + case DM_REPORT_FIELD_TYPE_SIZE: + fs->v.d = strtod(s, NULL); + if (errno == ERANGE) { + log_error(_out_of_range_msg, s); + goto error; + } + if (factor) + fs->v.d *= factor; + fs->v.d /= 512; /* store size in sectors! */ + dm_pool_free(rh->mem, s); + break; + default: + log_error(INTERNAL_ERROR "_create_field_selection: unknown field type"); + goto error; + } + } + + return fs; +error: + dm_pool_free(rh->mem, fs); + return NULL; +} + +static struct selection_node *_alloc_selection_node(struct dm_pool *mem, uint32_t type) +{ + struct selection_node *sn; + + if (!(sn = dm_pool_zalloc(mem, sizeof(struct selection_node)))) { + log_error("dm_report: struct selection_node allocation failed"); + return NULL; + } + + dm_list_init(&sn->list); + sn->type = type; + if (!(type & SEL_ITEM)) + dm_list_init(&sn->selection.set); + + return sn; +} + +static char _sel_syntax_error_at_msg[] = "Selection syntax error at '%s'"; + +/* + * Selection parser + * + * _parse_* functions + * + * Input: + * s - a pointer to the parsed string + * Output: + * next - a pointer used for next _parse_*'s input, + * next == s if return value is NULL + * return value - a filter node pointer, + * NULL if s doesn't match + */ + +/* + * SELECTION := FIELD_NAME OP_CMP STRING | + * FIELD_NAME OP_CMP NUMBER | + * FIELD_NAME OP_REGEX REGEX + */ +static struct selection_node *_parse_selection(struct dm_report *rh, + const char *s, + const char **next) +{ + struct field_selection *fs; + struct selection_node *sn; + const char *ws, *we; /* field name */ + const char *vs, *ve; /* value */ + const char *last; + uint32_t flags, field_num; + const struct dm_report_field_type *ft; + uint64_t factor; + char *tmp; + char c; + + /* field name */ + if (!(last = _tok_field_name(s, &ws, &we))) { + log_error("Expecting field name"); + goto bad; + } + + /* check if the field with given name exists */ + if (!_get_field(rh, ws, (size_t) (we - ws), &field_num)) { + c = we[0]; + tmp = (char *) we; + tmp[0] = '\0'; + log_error("Unrecognized selection field: %s", ws); + tmp[0] = c; + goto bad; + } + + ft = &rh->fields[field_num]; + + if (!last) { + log_error("Missing operator after field %s", ft->id); + goto bad; + } + + /* comparison operator */ + if (!(flags = _tok_op_cmp(we, &last))) { + log_error("Unrecognized comparison operator: %s", s); + goto bad; + } + if (!last) { + log_error("Missing value after operator"); + goto bad; + } + + /* comparison value */ + if (flags & FLD_CMP_REGEX) { + if (!(last = _tok_regex(ft, last, &vs, &ve, &flags))) + goto_bad; + } else { + if (!(last = _tok_value(ft, last, &vs, &ve, &factor, &flags))) + goto_bad; + } + + *next = _skip_space(last); + + /* create selection */ + if (!(fs = _create_field_selection(rh, field_num, vs, (size_t) (ve - vs), factor, flags))) + return_NULL; + + /* create selection node */ + if (!(sn = _alloc_selection_node(rh->mem, SEL_ITEM))) + return_NULL; + + /* add selection to selection node */ + sn->selection.item = fs; + + return sn; +bad: + log_error(_sel_syntax_error_at_msg, s); + *next = s; + return NULL; +} + +static struct selection_node *_parse_or_ex(struct dm_report *rh, + const char *s, + const char **next, + struct selection_node *or_sn); + +static struct selection_node *_parse_ex(struct dm_report *rh, + const char *s, + const char **next) +{ + struct selection_node *sn = NULL; + uint32_t t; + const char *tmp; + + t = _tok_op_log(s, next, SEL_MODIFIER_NOT | SEL_PRECEDENCE_PS); + if (t == SEL_MODIFIER_NOT) { + /* '!' '(' EXPRESSION ')' */ + if (!_tok_op_log(*next, &tmp, SEL_PRECEDENCE_PS)) { + log_error("Syntax error: '(' expected at \'%s\'", *next); + goto error; + } + if (!(sn = _parse_or_ex(rh, tmp, next, NULL))) + goto error; + sn->type |= SEL_MODIFIER_NOT; + if (!_tok_op_log(*next, &tmp, SEL_PRECEDENCE_PE)) { + log_error("Syntax error: ')' expected at \'%s\'", *next); + goto error; + } + *next = tmp; + } else if (t == SEL_PRECEDENCE_PS) { + /* '(' EXPRESSION ')' */ + if (!(sn = _parse_or_ex(rh, *next, &tmp, NULL))) + goto error; + if (!_tok_op_log(tmp, next, SEL_PRECEDENCE_PE)) { + log_error("Syntax error: ')' expected at \'%s\'", *next); + goto error; + } + } else if ((s = _skip_space(s))) { + /* SELECTION */ + sn = _parse_selection(rh, s, next); + } else { + sn = NULL; + *next = s; + } + + return sn; +error: + *next = s; + return NULL; +} + +/* AND_EXPRESSION := EX (AND_OP AND_EXPRSSION) */ +static struct selection_node *_parse_and_ex(struct dm_report *rh, + const char *s, + const char **next, + struct selection_node *and_sn) +{ + struct selection_node *n; + const char *tmp; + + n = _parse_ex(rh, s, next); + if (!n) + goto error; + + if (!_tok_op_log(*next, &tmp, SEL_AND)) { + if (!and_sn) + return n; + dm_list_add(&and_sn->selection.set, &n->list); + return and_sn; + } + + if (!and_sn) { + if (!(and_sn = _alloc_selection_node(rh->mem, SEL_AND))) + goto error; + } + dm_list_add(&and_sn->selection.set, &n->list); + + return _parse_and_ex(rh, tmp, next, and_sn); +error: + *next = s; + return NULL; +} + +/* OR_EXPRESSION := AND_EXPRESSION (OR_OP OR_EXPRESSION) */ +static struct selection_node *_parse_or_ex(struct dm_report *rh, + const char *s, + const char **next, + struct selection_node *or_sn) +{ + struct selection_node *n; + const char *tmp; + + n = _parse_and_ex(rh, s, next, NULL); + if (!n) + goto error; + + if (!_tok_op_log(*next, &tmp, SEL_OR)) { + if (!or_sn) + return n; + dm_list_add(&or_sn->selection.set, &n->list); + return or_sn; + } + + if (!or_sn) { + if (!(or_sn = _alloc_selection_node(rh->mem, SEL_OR))) + goto error; + } + dm_list_add(&or_sn->selection.set, &n->list); + + return _parse_or_ex(rh, tmp, next, or_sn); +error: + *next = s; + return NULL; +} + +int dm_report_set_output_selection(struct dm_report *rh, uint32_t *report_types, + const char *selection) +{ + struct selection_node *root = NULL; + const char *fin, *next; + + if (rh->selection_root) { + // TODO: destroy old root and replace with new one instead! + return 1; + } + + if (!selection || !selection[0]) { + rh->selection_root = NULL; + return 1; + } + + if (!(root = _alloc_selection_node(rh->mem, SEL_OR))) + return_0; + + if (!_parse_or_ex(rh, selection, &fin, root)) + goto error; + + next = _skip_space(fin); + if (*next) { + log_error("Expecting logical operator"); + log_error(_sel_syntax_error_at_msg, next); + goto error; + } + + if (report_types) + *report_types = rh->report_types; + + rh->selection_root = root; + return 1; +error: + dm_pool_free(rh->mem, root); + return 0; +} /* * Print row of headings |