161 lines
5.7 KiB
Diff
161 lines
5.7 KiB
Diff
diff -N -u -r ../procps-ng-3.3.9/top/strverscmp.c ./top/strverscmp.c
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--- ../procps-ng-3.3.9/top/strverscmp.c 1970-01-01 01:00:00.000000000 +0100
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+++ ./top/strverscmp.c 2014-07-06 07:26:13.650946884 +0200
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@@ -0,0 +1,156 @@
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+/* Compare strings while treating digits characters numerically.
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+ Copyright (C) 1997, 2002, 2005 Free Software Foundation, Inc.
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+ This file is part of the libiberty library.
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+ Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.
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+
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+ Libiberty is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ Libiberty is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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+ 02110-1301 USA. */
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+
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+#include <ctype.h>
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+
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+/*
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+@deftypefun int strverscmp (const char *@var{s1}, const char *@var{s2})
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+The @code{strverscmp} function compares the string @var{s1} against
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+@var{s2}, considering them as holding indices/version numbers. Return
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+value follows the same conventions as found in the @code{strverscmp}
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+function. In fact, if @var{s1} and @var{s2} contain no digits,
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+@code{strverscmp} behaves like @code{strcmp}.
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+
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+Basically, we compare strings normally (character by character), until
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+we find a digit in each string - then we enter a special comparison
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+mode, where each sequence of digits is taken as a whole. If we reach the
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+end of these two parts without noticing a difference, we return to the
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+standard comparison mode. There are two types of numeric parts:
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+"integral" and "fractional" (those begin with a '0'). The types
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+of the numeric parts affect the way we sort them:
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+
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+@itemize @bullet
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+@item
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+integral/integral: we compare values as you would expect.
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+
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+@item
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+fractional/integral: the fractional part is less than the integral one.
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+Again, no surprise.
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+
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+@item
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+fractional/fractional: the things become a bit more complex.
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+If the common prefix contains only leading zeroes, the longest part is less
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+than the other one; else the comparison behaves normally.
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+@end itemize
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+
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+@smallexample
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+strverscmp ("no digit", "no digit")
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+ @result{} 0 // @r{same behavior as strcmp.}
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+strverscmp ("item#99", "item#100")
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+ @result{} <0 // @r{same prefix, but 99 < 100.}
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+strverscmp ("alpha1", "alpha001")
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+ @result{} >0 // @r{fractional part inferior to integral one.}
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+strverscmp ("part1_f012", "part1_f01")
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+ @result{} >0 // @r{two fractional parts.}
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+strverscmp ("foo.009", "foo.0")
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+ @result{} <0 // @r{idem, but with leading zeroes only.}
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+@end smallexample
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+
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+This function is especially useful when dealing with filename sorting,
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+because filenames frequently hold indices/version numbers.
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+@end deftypefun
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+
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+*/
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+
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+/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
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+ fractional parts, S_Z: idem but with leading Zeroes only */
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+#define S_N 0x0
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+#define S_I 0x4
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+#define S_F 0x8
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+#define S_Z 0xC
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+
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+/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
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+#define CMP 2
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+#define LEN 3
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+
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+
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+/* Compare S1 and S2 as strings holding indices/version numbers,
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+ returning less than, equal to or greater than zero if S1 is less than,
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+ equal to or greater than S2 (for more info, see the Glibc texinfo doc). */
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+
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+int
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+strverscmp (const char *s1, const char *s2)
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+{
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+ const unsigned char *p1 = (const unsigned char *) s1;
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+ const unsigned char *p2 = (const unsigned char *) s2;
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+ unsigned char c1, c2;
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+ int state;
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+ int diff;
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+
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+ /* Symbol(s) 0 [1-9] others (padding)
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+ Transition (10) 0 (01) d (00) x (11) - */
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+ static const unsigned int next_state[] =
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+ {
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+ /* state x d 0 - */
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+ /* S_N */ S_N, S_I, S_Z, S_N,
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+ /* S_I */ S_N, S_I, S_I, S_I,
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+ /* S_F */ S_N, S_F, S_F, S_F,
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+ /* S_Z */ S_N, S_F, S_Z, S_Z
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+ };
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+
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+ static const int result_type[] =
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+ {
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+ /* state x/x x/d x/0 x/- d/x d/d d/0 d/-
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+ 0/x 0/d 0/0 0/- -/x -/d -/0 -/- */
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+
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+ /* S_N */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
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+ CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
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+ /* S_I */ CMP, -1, -1, CMP, +1, LEN, LEN, CMP,
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+ +1, LEN, LEN, CMP, CMP, CMP, CMP, CMP,
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+ /* S_F */ CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
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+ CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
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+ /* S_Z */ CMP, +1, +1, CMP, -1, CMP, CMP, CMP,
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+ -1, CMP, CMP, CMP
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+ };
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+
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+ if (p1 == p2)
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+ return 0;
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+
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+ c1 = *p1++;
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+ c2 = *p2++;
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+ /* Hint: '0' is a digit too. */
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+ state = S_N | ((c1 == '0') + (isdigit (c1) != 0));
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+
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+ while ((diff = c1 - c2) == 0 && c1 != '\0')
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+ {
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+ state = next_state[state];
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+ c1 = *p1++;
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+ c2 = *p2++;
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+ state |= (c1 == '0') + (isdigit (c1) != 0);
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+ }
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+
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+ state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))];
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+
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+ switch (state)
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+ {
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+ case CMP:
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+ return diff;
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+
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+ case LEN:
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+ while (isdigit (*p1++))
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+ if (!isdigit (*p2++))
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+ return 1;
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+
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+ return isdigit (*p2) ? -1 : diff;
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+
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+ default:
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+ return state;
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+ }
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+}
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