| 1 | /*␊ |
| 2 | * strcasecmp.c␊ |
| 3 | */␊ |
| 4 | ␊ |
| 5 | #include <string.h>␊ |
| 6 | #include <ctype.h>␊ |
| 7 | ␊ |
| 8 | int strcasecmp(const char *s1, const char *s2)␊ |
| 9 | {␊ |
| 10 | ␉const unsigned char *c1 = (const unsigned char *)s1;␊ |
| 11 | ␉const unsigned char *c2 = (const unsigned char *)s2;␊ |
| 12 | ␉unsigned char ch;␊ |
| 13 | ␉int d = 0;␊ |
| 14 | ␊ |
| 15 | ␉while (1) {␊ |
| 16 | ␉␉/* toupper() expects an unsigned char (implicitly cast to int)␊ |
| 17 | ␉␉ as input, and returns an int, which is exactly what we want. */␊ |
| 18 | ␉␉d = toupper(ch = *c1++) - toupper(*c2++);␊ |
| 19 | ␉␉if (d || !ch)␊ |
| 20 | ␉␉␉break;␊ |
| 21 | ␉}␊ |
| 22 | ␊ |
| 23 | ␉return d;␊ |
| 24 | }␊ |
| 25 | |
