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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
nxt_str_t *
nxt_str_alloc(nxt_mp_t *mp, size_t length)
{
nxt_str_t *s;
/* The string start is allocated aligned to be close to nxt_str_t. */
s = nxt_mp_get(mp, sizeof(nxt_str_t) + length);
if (nxt_fast_path(s != NULL)) {
s->length = length;
s->start = (u_char *) s + sizeof(nxt_str_t);
}
return s;
}
/*
* nxt_str_dup() creates a new string with a copy of a source string.
* If length of the source string is zero, then the new string anyway
* gets a pointer somewhere in mem_pool.
*/
nxt_str_t *
nxt_str_dup(nxt_mp_t *mp, nxt_str_t *dst, const nxt_str_t *src)
{
u_char *p;
if (dst == NULL) {
/* The string start is allocated aligned to be close to nxt_str_t. */
dst = nxt_mp_get(mp, sizeof(nxt_str_t) + src->length);
if (nxt_slow_path(dst == NULL)) {
return NULL;
}
p = (u_char *) dst;
p += sizeof(nxt_str_t);
dst->start = p;
} else {
dst->start = nxt_mp_nget(mp, src->length);
if (nxt_slow_path(dst->start == NULL)) {
return NULL;
}
}
nxt_memcpy(dst->start, src->start, src->length);
dst->length = src->length;
return dst;
}
/*
* nxt_str_copy() creates a C style zero-terminated copy of a source
* nxt_str_t. The function is intended to create strings suitable
* for libc and kernel interfaces so result is pointer to char instead
* of u_char to minimize casts. The copy is aligned to 2 bytes thus
* the lowest bit may be used as marker.
*/
char *
nxt_str_copy(nxt_mp_t *mp, const nxt_str_t *src)
{
char *p, *dst;
dst = nxt_mp_align(mp, 2, src->length + 1);
if (nxt_fast_path(dst != NULL)) {
p = nxt_cpymem(dst, src->start, src->length);
*p = '\0';
}
return dst;
}
void
nxt_memcpy_lowcase(u_char *dst, const u_char *src, size_t length)
{
u_char c;
while (length != 0) {
c = *src++;
*dst++ = nxt_lowcase(c);
length--;
}
}
u_char *
nxt_cpystrn(u_char *dst, const u_char *src, size_t length)
{
if (length == 0) {
return dst;
}
while (--length != 0) {
*dst = *src;
if (*dst == '\0') {
return dst;
}
dst++;
src++;
}
*dst = '\0';
return dst;
}
nxt_int_t
nxt_strcasecmp(const u_char *s1, const u_char *s2)
{
u_char c1, c2;
nxt_int_t n;
for ( ;; ) {
c1 = *s1++;
c2 = *s2++;
c1 = nxt_lowcase(c1);
c2 = nxt_lowcase(c2);
n = c1 - c2;
if (n != 0) {
return n;
}
if (c1 == 0) {
return 0;
}
}
}
nxt_int_t
nxt_strncasecmp(const u_char *s1, const u_char *s2, size_t length)
{
u_char c1, c2;
nxt_int_t n;
while (length-- != 0) {
c1 = *s1++;
c2 = *s2++;
c1 = nxt_lowcase(c1);
c2 = nxt_lowcase(c2);
n = c1 - c2;
if (n != 0) {
return n;
}
if (c1 == 0) {
return 0;
}
}
return 0;
}
nxt_int_t
nxt_memcasecmp(const u_char *s1, const u_char *s2, size_t length)
{
u_char c1, c2;
nxt_int_t n;
while (length-- != 0) {
c1 = *s1++;
c2 = *s2++;
c1 = nxt_lowcase(c1);
c2 = nxt_lowcase(c2);
n = c1 - c2;
if (n != 0) {
return n;
}
}
return 0;
}
/*
* nxt_memstrn() is intended for search of static substring "ss"
* with known length "length" in string "s" limited by parameter "end".
* Zeros are ignored in both strings.
*/
u_char *
nxt_memstrn(const u_char *s, const u_char *end, const char *ss, size_t length)
{
u_char c1, c2, *s2;
s2 = (u_char *) ss;
c2 = *s2++;
length--;
while (s < end) {
c1 = *s++;
if (c1 == c2) {
if (s + length > end) {
return NULL;
}
if (nxt_memcmp(s, s2, length) == 0) {
return (u_char *) s - 1;
}
}
}
return NULL;
}
/*
* nxt_strcasestrn() is intended for caseless search of static substring
* "ss" with known length "length" in string "s" limited by parameter "end".
* Zeros are ignored in both strings.
*/
u_char *
nxt_memcasestrn(const u_char *s, const u_char *end, const char *ss,
size_t length)
{
u_char c1, c2, *s2;
s2 = (u_char *) ss;
c2 = *s2++;
c2 = nxt_lowcase(c2);
length--;
while (s < end) {
c1 = *s++;
c1 = nxt_lowcase(c1);
if (c1 == c2) {
if (s + length > end) {
return NULL;
}
if (nxt_memcasecmp(s, s2, length) == 0) {
return (u_char *) s - 1;
}
}
}
return NULL;
}
/*
* nxt_rstrstrn() is intended to search for static substring "ss"
* with known length "length" in string "s" limited by parameter "end"
* in reverse order. Zeros are ignored in both strings.
*/
u_char *
nxt_rmemstrn(const u_char *s, const u_char *end, const char *ss, size_t length)
{
u_char c1, c2;
const u_char *s1, *s2;
s1 = end - length;
s2 = (u_char *) ss;
c2 = *s2++;
length--;
while (s < s1) {
c1 = *s1;
if (c1 == c2) {
if (nxt_memcmp(s1 + 1, s2, length) == 0) {
return (u_char *) s1;
}
}
s1--;
}
return NULL;
}
size_t
nxt_str_strip(u_char *start, u_char *end)
{
u_char *p;
for (p = end - 1; p >= start; p--) {
if (*p != NXT_CR && *p != NXT_LF) {
break;
}
}
return (p + 1) - start;
}
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