b7ed698cc9
Fix up -Wmissing-prototypes in compileable userspace code, mainly under Documentation/. Signed-off-by: Ladinu Chandrasinghe <ladinu.pub@gmail.com> Signed-off-by: Trevor Keith <tsrk@tsrk.net> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
33 lines
661 B
C
33 lines
661 B
C
/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
|
|
/* Usage example:
|
|
$ ./crc32hash "Dual Speed"
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
|
|
static unsigned int crc32(unsigned char const *p, unsigned int len)
|
|
{
|
|
int i;
|
|
unsigned int crc = 0;
|
|
while (len--) {
|
|
crc ^= *p++;
|
|
for (i = 0; i < 8; i++)
|
|
crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
|
|
}
|
|
return crc;
|
|
}
|
|
|
|
int main(int argc, char **argv) {
|
|
unsigned int result;
|
|
if (argc != 2) {
|
|
printf("no string passed as argument\n");
|
|
return -1;
|
|
}
|
|
result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
|
|
printf("0x%x\n", result);
|
|
return 0;
|
|
}
|