120 lines
4.4 KiB
C
120 lines
4.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fnmatch.h>
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#include "compare-operator.h"
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#include "string-util.h"
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CompareOperator parse_compare_operator(const char **s, CompareOperatorParseFlags flags) {
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static const struct {
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CompareOperator op;
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const char *str;
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CompareOperatorParseFlags valid_mask; /* If this operator appears when flags in mask not set, fail */
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CompareOperatorParseFlags need_mask; /* Skip over this operator when flags in mask not set */
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} table[] = {
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{ COMPARE_FNMATCH_EQUAL, "$=", .valid_mask = COMPARE_ALLOW_FNMATCH },
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{ COMPARE_FNMATCH_UNEQUAL, "!$=", .valid_mask = COMPARE_ALLOW_FNMATCH },
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{ COMPARE_UNEQUAL, "<>" },
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{ COMPARE_LOWER_OR_EQUAL, "<=" },
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{ COMPARE_GREATER_OR_EQUAL, ">=" },
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{ COMPARE_LOWER, "<" },
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{ COMPARE_GREATER, ">" },
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{ COMPARE_EQUAL, "==" },
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{ COMPARE_STRING_EQUAL, "=", .need_mask = COMPARE_EQUAL_BY_STRING },
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{ COMPARE_EQUAL, "=" },
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{ COMPARE_STRING_UNEQUAL, "!=", .need_mask = COMPARE_EQUAL_BY_STRING },
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{ COMPARE_UNEQUAL, "!=" },
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{ COMPARE_LOWER, "lt", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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{ COMPARE_LOWER_OR_EQUAL, "le", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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{ COMPARE_EQUAL, "eq", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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{ COMPARE_UNEQUAL, "ne", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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{ COMPARE_GREATER_OR_EQUAL, "ge", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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{ COMPARE_GREATER, "gt", .valid_mask = COMPARE_ALLOW_TEXTUAL },
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};
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assert(s);
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if (!*s) /* Hmm, we already reached the end, for example because extract_first_word() and
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* parse_compare_operator() are use on the same string? */
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return _COMPARE_OPERATOR_INVALID;
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for (size_t i = 0; i < ELEMENTSOF(table); i ++) {
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const char *e;
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if (table[i].need_mask != 0 && !FLAGS_SET(flags, table[i].need_mask))
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continue;
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e = startswith(*s, table[i].str);
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if (e) {
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if (table[i].valid_mask != 0 && !FLAGS_SET(flags, table[i].valid_mask))
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return _COMPARE_OPERATOR_INVALID;
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*s = e;
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return table[i].op;
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}
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}
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return _COMPARE_OPERATOR_INVALID;
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}
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int test_order(int k, CompareOperator op) {
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switch (op) {
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case COMPARE_LOWER:
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return k < 0;
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case COMPARE_LOWER_OR_EQUAL:
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return k <= 0;
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case COMPARE_EQUAL:
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return k == 0;
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case COMPARE_UNEQUAL:
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return k != 0;
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case COMPARE_GREATER_OR_EQUAL:
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return k >= 0;
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case COMPARE_GREATER:
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return k > 0;
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default:
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return -EINVAL;
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}
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}
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int version_or_fnmatch_compare(
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CompareOperator op,
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const char *a,
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const char *b) {
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int r;
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switch (op) {
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case COMPARE_STRING_EQUAL:
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return streq_ptr(a, b);
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case COMPARE_STRING_UNEQUAL:
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return !streq_ptr(a, b);
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case COMPARE_FNMATCH_EQUAL:
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r = fnmatch(b, a, 0);
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return r == 0 ? true :
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r == FNM_NOMATCH ? false : -EINVAL;
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case COMPARE_FNMATCH_UNEQUAL:
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r = fnmatch(b, a, 0);
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return r == FNM_NOMATCH ? true:
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r == 0 ? false : -EINVAL;
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case _COMPARE_OPERATOR_ORDER_FIRST..._COMPARE_OPERATOR_ORDER_LAST:
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return test_order(strverscmp_improved(a, b), op);
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default:
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return -EINVAL;
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}
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}
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