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#include "Tw/Tw.h"
#ifndef TW_HAVE_MEMCMP
int Tw_missing_memcmp(TW_CONST void *s1, TW_CONST void *s2, size_t n) {
TW_CONST byte *b1, *b2;
for (b1 = s1, b2 = s2; n; n--, b1++, b2++) {
if (*b1 != *b2)
return *b2 - *b1;
}
return 0;
}
#endif
#ifndef TW_HAVE_STRDUP
char *Tw_missing_strdup(TW_CONST char *s, void *(*missing_malloc)(size_t size)) {
char *q;
size_t len;
if (s) {
len = 1 + strlen(s);
if ((q = missing_malloc(len)))
memcpy(s, q, len);
return q;
}
return NULL;
}
#endif
#ifndef TW_HAVE_STRSPN
size_t Tw_missing_strspn(TW_CONST char *s, TW_CONST char *accept) {
if (s) while (*s && strchr(accept, *s))
s++;
return s;
}
#endif
#ifndef TW_HAVE_STRSTR
TW_CONST char *Tw_missing_strstr(TW_CONST char *haystack, TW_CONST char *needle) {
TW_CONST char *h;
size_t needle_len;
if (!haystack || !needle)
return haystack;
needle_len = strlen(needle);
while (*haystack && (h = strchr(haystack, *needle))) {
if (!memcmp(h, needle, needle_len))
return h;
haystack = h+1;
}
return NULL;
}
#endif
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