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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv)
{
int i = 0;
char buffer[1024];
char *res = NULL;
char *pool = NULL;
char *local_pool = NULL;
size_t pool_size = 0;
if (argc != 2)
{
fprintf(stderr, "Usage: %s <character pool>\n", argv[0]);
return EXIT_FAILURE;
}
pool = argv[1];
pool_size = strlen(pool);
local_pool = malloc(pool_size);
if (local_pool == NULL)
{
fprintf(stderr, "%s: malloc for local pool failed\n", argv[0]);
return EXIT_FAILURE;
}
while (fgets(buffer, sizeof(buffer), stdin))
{
buffer[strcspn(buffer, "\r\n")] = '\0'; /* chomp */
if (strlen(buffer) == 0)
continue;
strcpy(local_pool, pool);
for (i = strlen(buffer)-1; i >= 0; i--)
{
if ((res = memchr(local_pool, buffer[i], pool_size)) != NULL)
*res = '\0';
else
break;
}
printf("%s %s\n", buffer, i < 0? "matches" : "doesn't match" );
}
return 0;
}
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