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--- src/fsearch_string_utils.c.orig 2022-08-17 17:50:25 UTC
+++ src/fsearch_string_utils.c
@@ -164,3 +164,91 @@ fsearch_string_starts_with_interval(char *str, char **
*end_ptr = str;
return false;
}
+
+/* Compare strings while treating digits characters numerically.
+ Copyright (C) 1997-2022 Free Software Foundation, Inc.
+ Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>,
+ 1997. */
+
+#include <stdint.h>
+
+/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
+ fractional parts, S_Z: idem but with leading Zeroes only */
+#define S_N 0x0
+#define S_I 0x3
+#define S_F 0x6
+#define S_Z 0x9
+
+/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
+#define CMP 2
+#define LEN 3
+
+/* Compare S1 and S2 as strings holding indices/version numbers,
+ returning less than, equal to, or greater than zero if S1 is less
+ than, equal to, or greater than S2. */
+
+int
+strverscmp (const char *s1, const char *s2)
+{
+ const unsigned char *p1 = (const unsigned char *) s1;
+ const unsigned char *p2 = (const unsigned char *) s2;
+
+ /* Symbol(s) 0 [1-9] others
+ Transition (10) 0 (01) d (00) x */
+ static const uint_least8_t next_state[] =
+ {
+ /* state x d 0 */
+ /* S_N */ S_N, S_I, S_Z,
+ /* S_I */ S_N, S_I, S_I,
+ /* S_F */ S_N, S_F, S_F,
+ /* S_Z */ S_N, S_F, S_Z
+ };
+
+ static const int_least8_t result_type[] =
+ {
+ /* state x/x x/d x/0 d/x d/d d/0 0/x 0/d 0/0 */
+
+ /* S_N */ CMP, CMP, CMP, CMP, LEN, CMP, CMP, CMP, CMP,
+ /* S_I */ CMP, -1, -1, +1, LEN, LEN, +1, LEN, LEN,
+ /* S_F */ CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
+ /* S_Z */ CMP, +1, +1, -1, CMP, CMP, -1, CMP, CMP
+ };
+
+ if (p1 == p2)
+ return 0;
+
+ unsigned char c1 = *p1++;
+ unsigned char c2 = *p2++;
+ /* Hint: '0' is a digit too. */
+ int state = S_N + ((c1 == '0') + (isdigit (c1) != 0));
+
+ int diff;
+ while ((diff = c1 - c2) == 0)
+ {
+ if (c1 == '\0')
+ return diff;
+
+ state = next_state[state];
+ c1 = *p1++;
+ c2 = *p2++;
+ state += (c1 == '0') + (isdigit (c1) != 0);
+ }
+
+ state = result_type[state * 3 + (((c2 == '0') + (isdigit (c2) != 0)))];
+
+ switch (state)
+ {
+ case CMP:
+ return diff;
+
+ case LEN:
+ while (isdigit (*p1++))
+ if (!isdigit (*p2++))
+ return 1;
+
+ return isdigit (*p2) ? -1 : diff;
+
+ default:
+ return state;
+ }
+}
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