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-rw-r--r--libmisc/getrange.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/libmisc/getrange.c b/libmisc/getrange.c
new file mode 100644
index 0000000..82f2edf
--- /dev/null
+++ b/libmisc/getrange.c
@@ -0,0 +1,101 @@
+/*
+ * SPDX-FileCopyrightText: 2008 , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id: $"
+
+#include <ctype.h>
+#include <stdlib.h>
+
+#include "defines.h"
+#include "prototypes.h"
+
+/*
+ * Parse a range and indicate if the range is valid.
+ * Valid ranges are in the form:
+ * <long> -> min=max=long has_min has_max
+ * -<long> -> max=long !has_min has_max
+ * <long>- -> min=long has_min !has_max
+ * <long1>-<long2> -> min=long1 max=long2 has_min has_max
+ *
+ * If the range is valid, getrange returns 1.
+ * If the range is not valid, getrange returns 0.
+ */
+int getrange (const char *range,
+ unsigned long *min, bool *has_min,
+ unsigned long *max, bool *has_max)
+{
+ char *endptr;
+ unsigned long n;
+
+ if (NULL == range) {
+ return 0;
+ }
+
+ if ('-' == range[0]) {
+ if (!isdigit(range[1])) {
+ /* invalid */
+ return 0;
+ }
+ errno = 0;
+ n = strtoul (&range[1], &endptr, 10);
+ if (('\0' != *endptr) || (ERANGE == errno)) {
+ /* invalid */
+ return 0;
+ }
+ /* -<long> */
+ *has_min = false;
+ *has_max = true;
+ *max = n;
+ } else {
+ errno = 0;
+ n = strtoul (range, &endptr, 10);
+ if (ERANGE == errno) {
+ /* invalid */
+ return 0;
+ }
+ switch (*endptr) {
+ case '\0':
+ /* <long> */
+ *has_min = true;
+ *has_max = true;
+ *min = n;
+ *max = n;
+ break;
+ case '-':
+ endptr++;
+ if ('\0' == *endptr) {
+ /* <long>- */
+ *has_min = true;
+ *has_max = false;
+ *min = n;
+ } else if (!isdigit (*endptr)) {
+ /* invalid */
+ return 0;
+ } else {
+ *has_min = true;
+ *min = n;
+ errno = 0;
+ n = strtoul (endptr, &endptr, 10);
+ if ( ('\0' != *endptr)
+ || (ERANGE == errno)) {
+ /* invalid */
+ return 0;
+ }
+ /* <long>-<long> */
+ *has_max = true;
+ *max = n;
+ }
+ break;
+ default:
+ return 0;
+ }
+ }
+
+ return 1;
+}
+