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107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
--- themer/main.c.orig 2009-10-13 20:56:23.000000000 -0400
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+++ themer/main.c 2010-11-24 15:45:57.000000000 -0500
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@@ -7,6 +7,103 @@
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#include <emerald.h>
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#include <engine.h>
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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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+/* ISDIGIT differs from isdigit, as follows:
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+ - Its arg may be any int or unsigned int; it need not be an unsigned char.
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+ - It's guaranteed to evaluate its argument exactly once.
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+ - It's typically faster.
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+ Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
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+ only '0' through '9' are digits. Prefer ISDIGIT to isdigit unless
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+ it's important to use the locale's definition of `digit' even when the
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+ host does not conform to Posix. */
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+#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
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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 texinfo doc).
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+*/
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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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+
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#define LAST_COMPAT_VER "0.1.0"
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typedef struct _FetcherInfo
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