tparsescore.c - plan9port - [fork] Plan 9 from user space
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       ---
       tparsescore.c (719B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <venti.h>
            4 
            5 int
            6 vtparsescore(char *s, char **prefix, uchar score[VtScoreSize])
            7 {
            8         int i, c;
            9         char *buf, *colon;
           10 
           11         if((colon = strchr(s, ':')) != nil)
           12                 buf = colon+1;
           13         else
           14                 buf = s;
           15 
           16         if(strlen(buf) != 2*VtScoreSize)
           17                 return -1;
           18 
           19         memset(score, 0, VtScoreSize);
           20         for(i=0; i<2*VtScoreSize; i++){
           21                 if(buf[i] >= '0' && buf[i] <= '9')
           22                         c = buf[i] - '0';
           23                 else if(buf[i] >= 'a' && buf[i] <= 'z')
           24                         c = buf[i] - 'a' + 10;
           25                 else if(buf[i] >= 'A' && buf[i] <= 'Z')
           26                         c = buf[i] - 'A' + 10;
           27                 else
           28                         return -1;
           29 
           30                 if((i & 1) == 0)
           31                         c <<= 4;
           32                 score[i>>1] |= c;
           33         }
           34         if(colon){
           35                 *colon = 0;
           36                 if(prefix)
           37                         *prefix = s;
           38         }else{
           39                 if(prefix)
           40                         *prefix = nil;
           41         }
           42         return 0;
           43 }