nginx/src/core/ngx_string.c

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/*
* Copyright (C) 2002-2004 Igor Sysoev
*/
#include <ngx_config.h>
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#include <ngx_core.h>
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u_char *ngx_cpystrn(u_char *dst, u_char *src, size_t n)
{
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if (n == 0) {
return dst;
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}
for (/* void */; --n; dst++, src++) {
*dst = *src;
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if (*dst == '\0') {
return dst;
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}
}
*dst = '\0';
return dst;
}
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ngx_int_t ngx_rstrncmp(u_char *s1, u_char *s2, size_t n)
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{
if (n == 0) {
return 0;
}
n--;
for ( ;; ) {
if (s1[n] != s2[n]) {
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return s1[n] - s2[n];
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}
if (n == 0) {
return 0;
}
n--;
}
}
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ngx_int_t ngx_atoi(u_char *line, size_t n)
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{
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ngx_int_t value;
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if (n == 0) {
return NGX_ERROR;
}
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for (value = 0; n--; line++) {
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if (*line < '0' || *line > '9') {
return NGX_ERROR;
}
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value = value * 10 + (*line - '0');
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}
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if (value < 0) {
return NGX_ERROR;
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} else {
return value;
}
}
ngx_int_t ngx_hextoi(u_char *line, size_t n)
{
u_char ch;
ngx_int_t value;
if (n == 0) {
return NGX_ERROR;
}
for (value = 0; n--; line++) {
ch = *line;
if (ch >= '0' && ch <= '9') {
value = value * 16 + (ch - '0');
continue;
}
if (ch >= 'A' && ch <= 'F') {
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value = value * 16 + (ch - 'A' + 10);
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continue;
}
if (ch >= 'a' && ch <= 'f') {
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value = value * 16 + (ch - 'a' + 10);
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continue;
}
return NGX_ERROR;
}
if (value < 0) {
return NGX_ERROR;
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} else {
return value;
}
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}
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void ngx_md5_text(u_char *text, u_char *md5)
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{
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int i;
static u_char hex[] = "0123456789abcdef";
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for (i = 0; i < 16; i++) {
*text++ = hex[md5[i] >> 4];
*text++ = hex[md5[i] & 0xf];
}
*text = '\0';
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}
void ngx_encode_base64(ngx_str_t *src, ngx_str_t *dst)
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{
u_char *d, *s;
size_t len;
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static u_char basis64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
len = src->len;
s = src->data;
d = dst->data;
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while (len > 2) {
*d++ = basis64[(s[0] >> 2) & 0x3f];
*d++ = basis64[((s[0] & 3) << 4) | (s[1] >> 4)];
*d++ = basis64[((s[1] & 0x0f) << 2) | (s[2] >> 6)];
*d++ = basis64[s[2] & 0x3f];
s += 3;
len -= 3;
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}
if (len) {
*d++ = basis64[(s[0] >> 2) & 0x3f];
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if (len == 1) {
*d++ = basis64[(s[0] & 3) << 4];
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*d++ = '=';
} else {
*d++ = basis64[((s[0] & 3) << 4) | (s[1] >> 4)];
*d++ = basis64[(s[1] & 0x0f) << 2];
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}
*d++ = '=';
}
dst->len = d - dst->data;
}
ngx_int_t ngx_decode_base64(ngx_str_t *src, ngx_str_t *dst)
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{
size_t len;
u_char *d, *s;
static u_char basis64[] =
{ 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 62, 77, 77, 77, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 77, 77, 77, 77, 77, 77,
77, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 77, 77, 77, 77, 77,
77, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77,
77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77, 77 };
for (len = 0; len < src->len; len++) {
if (src->data[len] == '=') {
break;
}
if (basis64[src->data[len]] == 77) {
return NGX_ERROR;
}
}
if (len % 4 == 1) {
return NGX_ERROR;
}
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s = src->data;
d = dst->data;
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while (len > 3) {
*d++ = (u_char) (basis64[s[0]] << 2 | basis64[s[1]] >> 4);
*d++ = (u_char) (basis64[s[1]] << 4 | basis64[s[2]] >> 2);
*d++ = (u_char) (basis64[s[2]] << 6 | basis64[s[3]]);
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s += 4;
len -= 4;
}
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if (len > 1) {
*d++ = (u_char) (basis64[s[0]] << 2 | basis64[s[1]] >> 4);
}
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if (len > 2) {
*d++ = (u_char) (basis64[s[1]] << 4 | basis64[s[2]] >> 2);
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}
dst->len = d - dst->data;
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return NGX_OK;
}
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#if 0
char *ngx_psprintf(ngx_pool_t *p, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
while (*fmt) {
switch(*fmt++) {
case '%':
switch(*fmt++) {
case 's':
s = va_arg(args, char *);
n += ngx_strlen(s);
break;
default:
n++;
}
default:
n++;
}
}
str = ngx_palloc(p, n);
va_start(args, fmt);
for (i = 0; i < n; i++) {
switch(*fmt++) {
case '%':
switch(*fmt++) {
case 's':
s = va_arg(args, char *);
while (str[i++] = s);
break;
default:
n++;
}
default:
str[i] = *fmt;
}
}
len += ngx_vsnprintf(errstr + len, sizeof(errstr) - len - 1, fmt, args);
va_end(args);
}
#endif