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#include "case.h"
#include "str.h"
/**
@file case.c
@author djb
@brief string comparison and helper functions; case insensitive
*/
int case_diffb(char *s, unsigned int len, char *t)
{
unsigned char x;
unsigned char y;
while (len > 0) {
--len;
x = *s++ - 'A';
if (x <= 'Z' - 'A')
x += 'a';
else
x += 'A';
y = *t++ - 'A';
if (y <= 'Z' - 'A')
y += 'a';
else
y += 'A';
if (x != y) return ((int)(unsigned int)x) - ((int)(unsigned int)y);
}
return 0;
}
int case_diffs(char *s, char *t)
{
unsigned char x;
unsigned char y;
for (;;) {
x = *s++ - 'A';
if (x <= 'Z' - 'A')
x += 'a';
else
x += 'A';
y = *t++ - 'A';
if (y <= 'Z' - 'A')
y += 'a';
else
y += 'A';
if (x != y) break;
if (!x) break;
}
return ((int)(unsigned int)x) - ((int)(unsigned int)y);
}
int case_diffrs(char *s, char *t)
{
unsigned char x = 0;
unsigned char y = 0;
unsigned int lens = str_len(s);
unsigned int lent = str_len(t);
while (lens > 0 && lent > 0) {
x = s[--lens] - 'A';
if (x <= 'Z' - 'A')
x += 'a';
else
x += 'A';
y = t[--lent] - 'A';
if (y <= 'Z' - 'A')
y += 'a';
else
y += 'A';
if (x != y) break;
if (!x) break;
if (!y) break;
}
return ((int)(unsigned int)x) - ((int)(unsigned int)y);
}
void case_lowerb(char *s, unsigned int len)
{
unsigned char x;
while (len > 0) {
--len;
x = *s - 'A';
if (x <= 'Z' - 'A') *s = x + 'a';
++s;
}
}
void case_lowers(char *s)
{
unsigned char x;
while ((x = *s)) {
x -= 'A';
if (x <= 'Z' - 'A') *s = x + 'a';
++s;
}
}
void case_upperb(char *s, unsigned int len)
{
unsigned char x;
while (len > 0) {
--len;
x = *s - 'a';
if (x <= 'z' - 'a') *s = x + 'A';
++s;
}
}
void case_uppers(char *s)
{
unsigned char x;
while ((x = *s)) {
x -= 'a';
if (x <= 'z' - 'a') *s = x + 'A';
++s;
}
}
int case_startb(char *s, unsigned int len, char *t)
{
unsigned char x;
unsigned char y;
for (;;) {
y = *t++ - 'A';
if (y <= 'Z' - 'A')
y += 'a';
else
y += 'A';
if (!y) return 1;
if (!len) return 0;
--len;
x = *s++ - 'A';
if (x <= 'Z' - 'A')
x += 'a';
else
x += 'A';
if (x != y) return 0;
}
}
int case_starts(char *s, char *t)
{
unsigned char x;
unsigned char y;
for (;;) {
x = *s++ - 'A';
if (x <= 'Z' - 'A')
x += 'a';
else
x += 'A';
y = *t++ - 'A';
if (y <= 'Z' - 'A')
y += 'a';
else
y += 'A';
if (!y) return 1;
if (x != y) return 0;
}
}
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