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#include "str.h"
#include "stralloc.h"
/**
@file str.c
@author djb
@source qmail
@brief string handling functions
*/
unsigned int str_copy(char *s, const char *t)
{
int len = 0;
for (;;) {
// clang-format off
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
// clang-format on
}
}
unsigned int str_copyb(char *s, const char *t, unsigned int max)
{
int len = 0;
while (max-- > 0) {
// clang-format off
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
if (!(*s = *t)) { return len; } ++s; ++t; ++len;
// clang-format on
}
return len;
}
int str_diff(const char *s, const char *t)
{
char x;
for (;;) {
// clang-format off
x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
// clang-format on
}
return ((int)(unsigned int)(unsigned char)x) - ((int)(unsigned int)(unsigned char)*t);
}
int str_diffn(const char *s, const char *t, unsigned int len)
{
char x;
for (;;) {
// clang-format off
if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
if (!len--) { return 0; } x = *s; if (x != *t) { break; } if (!x) { break; } ++s; ++t;
// clang-format on
}
return ((int)(unsigned int)(unsigned char)x) - ((int)(unsigned int)(unsigned char)*t);
}
unsigned int str_len(const char *s)
{
const char *t = s;
for (;;) {
// clang-format off
if (!*t) { return t - s; } ++t;
if (!*t) { return t - s; } ++t;
if (!*t) { return t - s; } ++t;
if (!*t) { return t - s; } ++t;
// clang-format on
}
}
unsigned int str_chr(const char *s, int c)
{
char ch = c;
const char *t = s;
for (;;) {
// clang-format off
if (!*t) { break; } if (*t == ch) { break; } ++t;
if (!*t) { break; } if (*t == ch) { break; } ++t;
if (!*t) { break; } if (*t == ch) { break; } ++t;
if (!*t) { break; } if (*t == ch) { break; } ++t;
// clang-format on
}
return t - s;
}
unsigned int str_rchr(const char *s, int c)
{
char ch = c;
const char *t = s;
const char *u = 0;
for (;;) {
// clang-format off
if (!*t) { break; } if (*t == ch) { u = t; } ++t;
if (!*t) { break; } if (*t == ch) { u = t; } ++t;
if (!*t) { break; } if (*t == ch) { u = t; } ++t;
if (!*t) { break; } if (*t == ch) { u = t; } ++t;
// clang-format on
}
if (!u) u = t;
return u - s;
}
int str_start(const char *s, const char *t)
{
char x;
for (;;) {
// clang-format off
x = *t++; if (!x) return 1; if (x != *s++) return 0;
x = *t++; if (!x) return 1; if (x != *s++) return 0;
x = *t++; if (!x) return 1; if (x != *s++) return 0;
x = *t++; if (!x) return 1; if (x != *s++) return 0;
// clang-format on
}
}
char *str_append(char *dest, const char *s)
{
static stralloc sa = {0};
stralloc_copys(&sa, dest);
stralloc_catb(&sa, s, sizeof(s));
return sa.s;
}
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