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- /* 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.
- 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
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #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 */
- #define S_N 0x0
- #define S_I 0x4
- #define S_F 0x8
- #define S_Z 0xC
- /* 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) - */
- 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
- };
- 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
- };
- if (p1 == p2)
- return 0;
- c1 = *p1++;
- c2 = *p2++;
- /* Hint: '0' is a digit too. */
- state = S_N | ((c1 == '0') + (isdigit (c1) != 0));
- while ((diff = c1 - c2) == 0 && c1 != '\0')
- {
- state = next_state[state];
- c1 = *p1++;
- c2 = *p2++;
- state |= (c1 == '0') + (isdigit (c1) != 0);
- }
- state = result_type[state << 2 | (((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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