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-rw-r--r--src/shared/compare-operator.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/shared/compare-operator.c b/src/shared/compare-operator.c
new file mode 100644
index 0000000..ad931b7
--- /dev/null
+++ b/src/shared/compare-operator.c
@@ -0,0 +1,119 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fnmatch.h>
+
+#include "compare-operator.h"
+#include "string-util.h"
+
+CompareOperator parse_compare_operator(const char **s, CompareOperatorParseFlags flags) {
+ static const struct {
+ CompareOperator op;
+ const char *str;
+ CompareOperatorParseFlags valid_mask; /* If this operator appears when flags in mask not set, fail */
+ CompareOperatorParseFlags need_mask; /* Skip over this operattor when flags in mask not set */
+ } table[] = {
+ { COMPARE_FNMATCH_EQUAL, "$=", .valid_mask = COMPARE_ALLOW_FNMATCH },
+ { COMPARE_FNMATCH_UNEQUAL, "!$=", .valid_mask = COMPARE_ALLOW_FNMATCH },
+
+ { COMPARE_UNEQUAL, "<>" },
+ { COMPARE_LOWER_OR_EQUAL, "<=" },
+ { COMPARE_GREATER_OR_EQUAL, ">=" },
+ { COMPARE_LOWER, "<" },
+ { COMPARE_GREATER, ">" },
+ { COMPARE_EQUAL, "==" },
+ { COMPARE_STRING_EQUAL, "=", .need_mask = COMPARE_EQUAL_BY_STRING },
+ { COMPARE_EQUAL, "=" },
+ { COMPARE_STRING_UNEQUAL, "!=", .need_mask = COMPARE_EQUAL_BY_STRING },
+ { COMPARE_UNEQUAL, "!=" },
+
+ { COMPARE_LOWER, "lt", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ { COMPARE_LOWER_OR_EQUAL, "le", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ { COMPARE_EQUAL, "eq", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ { COMPARE_UNEQUAL, "ne", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ { COMPARE_GREATER_OR_EQUAL, "ge", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ { COMPARE_GREATER, "gt", .valid_mask = COMPARE_ALLOW_TEXTUAL },
+ };
+
+ assert(s);
+
+ if (!*s) /* Hmm, we already reached the end, for example because extract_first_word() and
+ * parse_compare_operator() are use on the same string? */
+ return _COMPARE_OPERATOR_INVALID;
+
+ for (size_t i = 0; i < ELEMENTSOF(table); i ++) {
+ const char *e;
+
+ if (table[i].need_mask != 0 && !FLAGS_SET(flags, table[i].need_mask))
+ continue;
+
+ e = startswith(*s, table[i].str);
+ if (e) {
+ if (table[i].valid_mask != 0 && !FLAGS_SET(flags, table[i].valid_mask))
+ return _COMPARE_OPERATOR_INVALID;
+
+ *s = e;
+ return table[i].op;
+ }
+ }
+
+ return _COMPARE_OPERATOR_INVALID;
+}
+
+int test_order(int k, CompareOperator op) {
+
+ switch (op) {
+
+ case COMPARE_LOWER:
+ return k < 0;
+
+ case COMPARE_LOWER_OR_EQUAL:
+ return k <= 0;
+
+ case COMPARE_EQUAL:
+ return k == 0;
+
+ case COMPARE_UNEQUAL:
+ return k != 0;
+
+ case COMPARE_GREATER_OR_EQUAL:
+ return k >= 0;
+
+ case COMPARE_GREATER:
+ return k > 0;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+int version_or_fnmatch_compare(
+ CompareOperator op,
+ const char *a,
+ const char *b) {
+ int r;
+
+ switch (op) {
+
+ case COMPARE_STRING_EQUAL:
+ return streq_ptr(a, b);
+
+ case COMPARE_STRING_UNEQUAL:
+ return !streq_ptr(a, b);
+
+ case COMPARE_FNMATCH_EQUAL:
+ r = fnmatch(b, a, 0);
+ return r == 0 ? true :
+ r == FNM_NOMATCH ? false : -EINVAL;
+
+ case COMPARE_FNMATCH_UNEQUAL:
+ r = fnmatch(b, a, 0);
+ return r == FNM_NOMATCH ? true:
+ r == 0 ? false : -EINVAL;
+
+ case _COMPARE_OPERATOR_ORDER_FIRST..._COMPARE_OPERATOR_ORDER_LAST:
+ return test_order(strverscmp_improved(a, b), op);
+
+ default:
+ return -EINVAL;
+ }
+}