diff options
Diffstat (limited to 'libc/string')
| -rw-r--r-- | libc/string/strverscmp.c | 69 |
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) { |