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-rw-r--r--libc/string/strverscmp.c69
1 files changed, 29 insertions, 40 deletions
diff --git a/libc/string/strverscmp.c b/libc/string/strverscmp.c
index 714f4ed67..7818a9186 100644
--- a/libc/string/strverscmp.c
+++ b/libc/string/strverscmp.c
@@ -1,13 +1,8 @@
-/* GNU's strverscmp() function, taken from glibc 2.3.2 sources
- */
-
/* Compare strings while treating digits characters numerically.
- Copyright (C) 1997, 2002 Free Software Foundation, Inc.
+ Copyright (C) 1997-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
- Derived work for uClibc by Hai Zaar, Codefidence Ltd <haizaar@codefidence.com>
-
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
@@ -22,63 +17,54 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#include <stdint.h>
#include <string.h>
#include <ctype.h>
-#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 */
+ fractionnal parts, S_Z: idem but with leading Zeroes only */
#define S_N 0x0
-#define S_I 0x4
-#define S_F 0x8
-#define S_Z 0xC
+#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
-/* using more efficient isdigit() */
-#undef isdigit
-#define isdigit(a) ((unsigned)((a) - '0') <= 9)
/* 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 (for more info, see the texinfo doc).
*/
+
int strverscmp (const char *s1, const char *s2)
{
const unsigned char *p1 = (const unsigned char *) s1;
const unsigned char *p2 = (const unsigned char *) s2;
- unsigned char c1, c2;
- int state;
- int diff;
- /* Symbol(s) 0 [1-9] others (padding)
- Transition (10) 0 (01) d (00) x (11) - */
+ /* Symbol(s) 0 [1-9] others
+ Transition (10) 0 (01) d (00) x */
static const uint8_t next_state[] =
{
- /* state x d 0 - */
- /* S_N */ S_N, S_I, S_Z, S_N,
- /* S_I */ S_N, S_I, S_I, S_I,
- /* S_F */ S_N, S_F, S_F, S_F,
- /* S_Z */ S_N, S_F, S_Z, S_Z
+ /* 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 int8_t result_type[] =
{
- /* state x/x x/d x/0 x/- d/x d/d d/0 d/-
- 0/x 0/d 0/0 0/- -/x -/d -/0 -/- */
-
- /* S_N */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
- CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
- /* S_I */ CMP, -1, -1, CMP, +1, LEN, LEN, CMP,
- +1, LEN, LEN, CMP, CMP, CMP, CMP, CMP,
- /* S_F */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
- CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
- /* S_Z */ CMP, +1, +1, CMP, -1, CMP, CMP, CMP,
- -1, CMP, CMP, CMP
+ /* 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
};
+ unsigned char c1, c2;
+ int state, diff;
if (p1 == p2)
return 0;
@@ -86,17 +72,20 @@ int strverscmp (const char *s1, const char *s2)
c1 = *p1++;
c2 = *p2++;
/* Hint: '0' is a digit too. */
- state = S_N | ((c1 == '0') + (isdigit (c1) != 0));
+ state = S_N + ((c1 == '0') + (isdigit (c1) != 0));
- while ((diff = c1 - c2) == 0 && c1 != '\0')
+ 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 += (c1 == '0') + (isdigit (c1) != 0);
}
- state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))];
+ state = result_type[state * 3 + (((c2 == '0') + (isdigit (c2) != 0)))];
switch (state)
{