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bfc1508d (kx 2023-03-24 03:55:33 +0300  1) 
bfc1508d (kx 2023-03-24 03:55:33 +0300  2) #ifdef HAVE_CONFIG_H
bfc1508d (kx 2023-03-24 03:55:33 +0300  3) #include <config.h>
bfc1508d (kx 2023-03-24 03:55:33 +0300  4) #endif
bfc1508d (kx 2023-03-24 03:55:33 +0300  5) 
bfc1508d (kx 2023-03-24 03:55:33 +0300  6) #include <stdint.h>
bfc1508d (kx 2023-03-24 03:55:33 +0300  7) #include <string.h>
bfc1508d (kx 2023-03-24 03:55:33 +0300  8) #include <ctype.h>
bfc1508d (kx 2023-03-24 03:55:33 +0300  9) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 10) /* states: S_N: normal, S_I: comparing integral part, S_F: comparing
bfc1508d (kx 2023-03-24 03:55:33 +0300 11)            fractionnal parts, S_Z: idem but with leading Zeroes only */
bfc1508d (kx 2023-03-24 03:55:33 +0300 12) #define  S_N    0x0
bfc1508d (kx 2023-03-24 03:55:33 +0300 13) #define  S_I    0x3
bfc1508d (kx 2023-03-24 03:55:33 +0300 14) #define  S_F    0x6
bfc1508d (kx 2023-03-24 03:55:33 +0300 15) #define  S_Z    0x9
bfc1508d (kx 2023-03-24 03:55:33 +0300 16) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 17) /* result_type: CMP: return diff; LEN: compare using len_diff/diff */
bfc1508d (kx 2023-03-24 03:55:33 +0300 18) #define  CMP    2
bfc1508d (kx 2023-03-24 03:55:33 +0300 19) #define  LEN    3
bfc1508d (kx 2023-03-24 03:55:33 +0300 20) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 21) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 22) /* Compare S1 and S2 as strings holding indices/version numbers,
bfc1508d (kx 2023-03-24 03:55:33 +0300 23)    returning less than, equal to or greater than zero if S1 is less than,
bfc1508d (kx 2023-03-24 03:55:33 +0300 24)    equal to or greater than S2 (for more info, see the texinfo doc).
bfc1508d (kx 2023-03-24 03:55:33 +0300 25) */
bfc1508d (kx 2023-03-24 03:55:33 +0300 26) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 27) int cmp_version( const char *s1, const char *s2 )
bfc1508d (kx 2023-03-24 03:55:33 +0300 28) {
bfc1508d (kx 2023-03-24 03:55:33 +0300 29)   const unsigned char *p1 = (const unsigned char *)s1;
bfc1508d (kx 2023-03-24 03:55:33 +0300 30)   const unsigned char *p2 = (const unsigned char *)s2;
bfc1508d (kx 2023-03-24 03:55:33 +0300 31) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 32)   /* Symbol(s)    0       [1-9]   others
bfc1508d (kx 2023-03-24 03:55:33 +0300 33)      Transition   (10) 0  (01) d  (00) x   */
bfc1508d (kx 2023-03-24 03:55:33 +0300 34)   static const uint8_t next_state[] =
bfc1508d (kx 2023-03-24 03:55:33 +0300 35)   {
bfc1508d (kx 2023-03-24 03:55:33 +0300 36)       /* state    x    d    0  */
bfc1508d (kx 2023-03-24 03:55:33 +0300 37)       /* S_N */  S_N, S_I, S_Z,
bfc1508d (kx 2023-03-24 03:55:33 +0300 38)       /* S_I */  S_N, S_I, S_I,
bfc1508d (kx 2023-03-24 03:55:33 +0300 39)       /* S_F */  S_N, S_F, S_F,
bfc1508d (kx 2023-03-24 03:55:33 +0300 40)       /* S_Z */  S_N, S_F, S_Z
bfc1508d (kx 2023-03-24 03:55:33 +0300 41)   };
bfc1508d (kx 2023-03-24 03:55:33 +0300 42) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 43)   static const int8_t result_type[] =
bfc1508d (kx 2023-03-24 03:55:33 +0300 44)   {
bfc1508d (kx 2023-03-24 03:55:33 +0300 45)       /* state   x/x  x/d  x/0  d/x  d/d  d/0  0/x  0/d  0/0  */
bfc1508d (kx 2023-03-24 03:55:33 +0300 46) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 47)       /* S_N */  CMP, CMP, CMP, CMP, LEN, CMP, CMP, CMP, CMP,
bfc1508d (kx 2023-03-24 03:55:33 +0300 48)       /* S_I */  CMP, -1,  -1,  +1,  LEN, LEN, +1,  LEN, LEN,
bfc1508d (kx 2023-03-24 03:55:33 +0300 49)       /* S_F */  CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
bfc1508d (kx 2023-03-24 03:55:33 +0300 50)       /* S_Z */  CMP, +1,  +1,  -1,  CMP, CMP, -1,  CMP, CMP
bfc1508d (kx 2023-03-24 03:55:33 +0300 51)   };
bfc1508d (kx 2023-03-24 03:55:33 +0300 52) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 53)   if( p1 == p2 ) return 0;
bfc1508d (kx 2023-03-24 03:55:33 +0300 54) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 55)   unsigned char c1 = *p1++;
bfc1508d (kx 2023-03-24 03:55:33 +0300 56)   unsigned char c2 = *p2++;
bfc1508d (kx 2023-03-24 03:55:33 +0300 57)   /* Hint: '0' is a digit too.  */
bfc1508d (kx 2023-03-24 03:55:33 +0300 58)   int state = S_N + ((c1 == '0') + (isdigit (c1) != 0));
bfc1508d (kx 2023-03-24 03:55:33 +0300 59) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 60)   int diff;
bfc1508d (kx 2023-03-24 03:55:33 +0300 61)   while( (diff = c1 - c2) == 0 )
bfc1508d (kx 2023-03-24 03:55:33 +0300 62)     {
bfc1508d (kx 2023-03-24 03:55:33 +0300 63)       if( c1 == '\0' ) return diff;
bfc1508d (kx 2023-03-24 03:55:33 +0300 64) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 65)       state  = next_state[state];
bfc1508d (kx 2023-03-24 03:55:33 +0300 66)       c1     = *p1++;
bfc1508d (kx 2023-03-24 03:55:33 +0300 67)       c2     = *p2++;
bfc1508d (kx 2023-03-24 03:55:33 +0300 68)       state += (c1 == '0') + (isdigit (c1) != 0);
bfc1508d (kx 2023-03-24 03:55:33 +0300 69)     }
bfc1508d (kx 2023-03-24 03:55:33 +0300 70) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 71)   state = result_type[state * 3 + (((c2 == '0') + (isdigit (c2) != 0)))];
bfc1508d (kx 2023-03-24 03:55:33 +0300 72) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 73)   switch (state)
bfc1508d (kx 2023-03-24 03:55:33 +0300 74)   {
bfc1508d (kx 2023-03-24 03:55:33 +0300 75)     case CMP:
bfc1508d (kx 2023-03-24 03:55:33 +0300 76)       return diff;
bfc1508d (kx 2023-03-24 03:55:33 +0300 77) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 78)     case LEN:
bfc1508d (kx 2023-03-24 03:55:33 +0300 79)       while( isdigit (*p1++) )
bfc1508d (kx 2023-03-24 03:55:33 +0300 80)         if( !isdigit (*p2++) )
bfc1508d (kx 2023-03-24 03:55:33 +0300 81)           return 1;
bfc1508d (kx 2023-03-24 03:55:33 +0300 82) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 83)       return isdigit (*p2) ? -1 : diff;
bfc1508d (kx 2023-03-24 03:55:33 +0300 84) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 85)     default:
bfc1508d (kx 2023-03-24 03:55:33 +0300 86)       return state;
bfc1508d (kx 2023-03-24 03:55:33 +0300 87)   }
bfc1508d (kx 2023-03-24 03:55:33 +0300 88) }
bfc1508d (kx 2023-03-24 03:55:33 +0300 89) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 90) 
bfc1508d (kx 2023-03-24 03:55:33 +0300 91) const char *max_version( const char *s1, const char *s2 )
bfc1508d (kx 2023-03-24 03:55:33 +0300 92) {
bfc1508d (kx 2023-03-24 03:55:33 +0300 93)   if( cmp_version( s1, s2 ) < 0 ) return s2;
bfc1508d (kx 2023-03-24 03:55:33 +0300 94)   else                            return s1;
bfc1508d (kx 2023-03-24 03:55:33 +0300 95) }