ref: ab876b803ac6efb812fddc8a154202b80632eb5e
parent: 40794e7a0a6c15a51ba7a781374fc0de9b529ec6
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Wed Oct 23 12:08:45 EDT 2024
u8_reverse: shorten
--- a/utf8.c
+++ b/utf8.c
@@ -285,40 +285,36 @@
}
int
-u8_reverse(char *dest, char * src, size_t len)
+u8_reverse(char *dest, char *src, size_t len)
{- size_t si = 0, di = len;
- uint8_t c;
+ size_t si, di;
- dest[di] = '\0';
- while(si < len){- c = (uint8_t)src[si];
- if((~c) & 0x80){+ dest[di = len] = '\0';
+ for(si = 0; si < len;){+ switch((uint8_t)src[si]>>4){+ case 0xf:
+ di -= 4;
+ dest[di+0] = src[si++];
+ dest[di+1] = src[si++];
+ dest[di+2] = src[si++];
+ dest[di+3] = src[si++];
+ break;
+ case 0xe:
+ di -= 3;
+ dest[di+0] = src[si++];
+ dest[di+1] = src[si++];
+ dest[di+2] = src[si++];
+ break;
+ case 0xd:
+ case 0xc:
+ di -= 2;
+ dest[di+0] = src[si++];
+ dest[di+1] = src[si++];
+ break;
+ default:
di--;
- dest[di] = c;
- si++;
- }else{- switch(c>>4){- case 0xc:
- case 0xd:
- di -= 2;
- *((uint16_t*)&dest[di]) = *((uint16_t*)&src[si]);
- si += 2;
- break;
- case 0xe:
- di -= 3;
- dest[di] = src[si];
- *((uint16_t*)&dest[di+1]) = *((uint16_t*)&src[si+1]);
- si += 3;
- break;
- case 0xf:
- di -= 4;
- *((uint32_t*)&dest[di]) = *((uint32_t*)&src[si]);
- si += 4;
- break;
- default:
- return 1;
- }
+ dest[di+0] = src[si++];
+ break;
}
}
return 0;