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#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "imapfilter.h"
/*
* An implementation of strstr() with case-insensitivity.
*/
const char *
xstrcasestr(const char *haystack, const char *needle)
{
const char *h, *n, *c;
size_t hl, nl;
c = haystack;
n = needle;
hl = strlen(haystack);
nl = strlen(needle);
while (hl >= nl) {
while (tolower((int)(*c)) != tolower((int)(*needle))) {
c++;
hl--;
if (hl < nl)
return NULL;
}
h = c;
n = needle;
while (tolower((int)(*h)) == tolower((int)(*n))) {
h++;
n++;
if (*n == '\0')
return c;
}
c++;
hl--;
}
return NULL;
}
/*
* Copies at most size characters from the string pointed by src to the array
* pointed by dest, always NULL terminating (unless size == 0). Returns
* pointer to dest.
*/
char *
xstrncpy(char *dst, const char *src, size_t len)
{
char *d;
const char *s;
size_t n;
d = dst;
s = src;
n = len;
while (n != 0) {
if ((*d++ = *s++) == '\0')
break;
n--;
}
if (n == 0 && len != 0)
*d = '\0';
return dst;
}
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