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ngx_string.c
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ngx_string.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
static u_char *ngx_sprintf_num(u_char *buf, u_char *last, uint64_t ui64,
u_char zero, ngx_uint_t hexadecimal, ngx_uint_t width);
static u_char *ngx_sprintf_str(u_char *buf, u_char *last, u_char *src,
size_t len, ngx_uint_t hexadecimal);
static void ngx_encode_base64_internal(ngx_str_t *dst, ngx_str_t *src,
const u_char *basis, ngx_uint_t padding);
static ngx_int_t ngx_decode_base64_internal(ngx_str_t *dst, ngx_str_t *src,
const u_char *basis);
void
ngx_strlow(u_char *dst, u_char *src, size_t n)
{
while (n) {
*dst = ngx_tolower(*src);
dst++;
src++;
n--;
}
}
size_t
ngx_strnlen(u_char *p, size_t n)
{
size_t i;
for (i = 0; i < n; i++) {
if (p[i] == '\0') {
return i;
}
}
return n;
}
u_char *
ngx_cpystrn(u_char *dst, u_char *src, size_t n)
{
if (n == 0) {
return dst;
}
while (--n) {
*dst = *src;
if (*dst == '\0') {
return dst;
}
dst++;
src++;
}
*dst = '\0';
return dst;
}
u_char *
ngx_pstrdup(ngx_pool_t *pool, ngx_str_t *src)
{
u_char *dst;
dst = ngx_pnalloc(pool, src->len);
if (dst == NULL) {
return NULL;
}
ngx_memcpy(dst, src->data, src->len);
return dst;
}
/*
* supported formats:
* %[0][width][x][X]O off_t
* %[0][width]T time_t
* %[0][width][u][x|X]z ssize_t/size_t
* %[0][width][u][x|X]d int/u_int
* %[0][width][u][x|X]l long
* %[0][width|m][u][x|X]i ngx_int_t/ngx_uint_t
* %[0][width][u][x|X]D int32_t/uint32_t
* %[0][width][u][x|X]L int64_t/uint64_t
* %[0][width|m][u][x|X]A ngx_atomic_int_t/ngx_atomic_uint_t
* %[0][width][.width]f double, max valid number fits to %18.15f
* %P ngx_pid_t
* %M ngx_msec_t
* %r rlim_t
* %p void *
* %[x|X]V ngx_str_t *
* %[x|X]v ngx_variable_value_t *
* %[x|X]s null-terminated string
* %*[x|X]s length and string
* %Z '\0'
* %N '\n'
* %c char
* %% %
*
* reserved:
* %t ptrdiff_t
* %S null-terminated wchar string
* %C wchar
*/
u_char * ngx_cdecl
ngx_sprintf(u_char *buf, const char *fmt, ...)
{
u_char *p;
va_list args;
va_start(args, fmt);
p = ngx_vslprintf(buf, (void *) -1, fmt, args);
va_end(args);
return p;
}
u_char * ngx_cdecl
ngx_snprintf(u_char *buf, size_t max, const char *fmt, ...)
{
u_char *p;
va_list args;
va_start(args, fmt);
p = ngx_vslprintf(buf, buf + max, fmt, args);
va_end(args);
return p;
}
u_char * ngx_cdecl
ngx_slprintf(u_char *buf, u_char *last, const char *fmt, ...)
{
u_char *p;
va_list args;
va_start(args, fmt);
p = ngx_vslprintf(buf, last, fmt, args);
va_end(args);
return p;
}
u_char *
ngx_vslprintf(u_char *buf, u_char *last, const char *fmt, va_list args)
{
u_char *p, zero;
int d;
double f;
size_t slen;
int64_t i64;
uint64_t ui64, frac;
ngx_msec_t ms;
ngx_uint_t width, sign, hex, max_width, frac_width, scale, n;
ngx_str_t *v;
ngx_variable_value_t *vv;
while (*fmt && buf < last) {
/*
* "buf < last" means that we could copy at least one character:
* the plain character, "%%", "%c", and minus without the checking
*/
if (*fmt == '%') {
i64 = 0;
ui64 = 0;
zero = (u_char) ((*++fmt == '0') ? '0' : ' ');
width = 0;
sign = 1;
hex = 0;
max_width = 0;
frac_width = 0;
slen = (size_t) -1;
while (*fmt >= '0' && *fmt <= '9') {
width = width * 10 + (*fmt++ - '0');
}
for ( ;; ) {
switch (*fmt) {
case 'u':
sign = 0;
fmt++;
continue;
case 'm':
max_width = 1;
fmt++;
continue;
case 'X':
hex = 2;
sign = 0;
fmt++;
continue;
case 'x':
hex = 1;
sign = 0;
fmt++;
continue;
case '.':
fmt++;
while (*fmt >= '0' && *fmt <= '9') {
frac_width = frac_width * 10 + (*fmt++ - '0');
}
break;
case '*':
slen = va_arg(args, size_t);
fmt++;
continue;
default:
break;
}
break;
}
switch (*fmt) {
case 'V':
v = va_arg(args, ngx_str_t *);
buf = ngx_sprintf_str(buf, last, v->data, v->len, hex);
fmt++;
continue;
case 'v':
vv = va_arg(args, ngx_variable_value_t *);
buf = ngx_sprintf_str(buf, last, vv->data, vv->len, hex);
fmt++;
continue;
case 's':
p = va_arg(args, u_char *);
buf = ngx_sprintf_str(buf, last, p, slen, hex);
fmt++;
continue;
case 'O':
i64 = (int64_t) va_arg(args, off_t);
sign = 1;
break;
case 'P':
i64 = (int64_t) va_arg(args, ngx_pid_t);
sign = 1;
break;
case 'T':
i64 = (int64_t) va_arg(args, time_t);
sign = 1;
break;
case 'M':
ms = (ngx_msec_t) va_arg(args, ngx_msec_t);
if ((ngx_msec_int_t) ms == -1) {
sign = 1;
i64 = -1;
} else {
sign = 0;
ui64 = (uint64_t) ms;
}
break;
case 'z':
if (sign) {
i64 = (int64_t) va_arg(args, ssize_t);
} else {
ui64 = (uint64_t) va_arg(args, size_t);
}
break;
case 'i':
if (sign) {
i64 = (int64_t) va_arg(args, ngx_int_t);
} else {
ui64 = (uint64_t) va_arg(args, ngx_uint_t);
}
if (max_width) {
width = NGX_INT_T_LEN;
}
break;
case 'd':
if (sign) {
i64 = (int64_t) va_arg(args, int);
} else {
ui64 = (uint64_t) va_arg(args, u_int);
}
break;
case 'l':
if (sign) {
i64 = (int64_t) va_arg(args, long);
} else {
ui64 = (uint64_t) va_arg(args, u_long);
}
break;
case 'D':
if (sign) {
i64 = (int64_t) va_arg(args, int32_t);
} else {
ui64 = (uint64_t) va_arg(args, uint32_t);
}
break;
case 'L':
if (sign) {
i64 = va_arg(args, int64_t);
} else {
ui64 = va_arg(args, uint64_t);
}
break;
case 'A':
if (sign) {
i64 = (int64_t) va_arg(args, ngx_atomic_int_t);
} else {
ui64 = (uint64_t) va_arg(args, ngx_atomic_uint_t);
}
if (max_width) {
width = NGX_ATOMIC_T_LEN;
}
break;
case 'f':
f = va_arg(args, double);
if (f < 0) {
*buf++ = '-';
f = -f;
}
ui64 = (int64_t) f;
frac = 0;
if (frac_width) {
scale = 1;
for (n = frac_width; n; n--) {
scale *= 10;
}
frac = (uint64_t) ((f - (double) ui64) * scale + 0.5);
if (frac == scale) {
ui64++;
frac = 0;
}
}
buf = ngx_sprintf_num(buf, last, ui64, zero, 0, width);
if (frac_width) {
if (buf < last) {
*buf++ = '.';
}
buf = ngx_sprintf_num(buf, last, frac, '0', 0, frac_width);
}
fmt++;
continue;
#if !(NGX_WIN32)
case 'r':
i64 = (int64_t) va_arg(args, rlim_t);
sign = 1;
break;
#endif
case 'p':
ui64 = (uintptr_t) va_arg(args, void *);
hex = 2;
sign = 0;
zero = '0';
width = 2 * sizeof(void *);
break;
case 'c':
d = va_arg(args, int);
*buf++ = (u_char) (d & 0xff);
fmt++;
continue;
case 'Z':
*buf++ = '\0';
fmt++;
continue;
case 'N':
#if (NGX_WIN32)
*buf++ = CR;
if (buf < last) {
*buf++ = LF;
}
#else
*buf++ = LF;
#endif
fmt++;
continue;
case '%':
*buf++ = '%';
fmt++;
continue;
default:
*buf++ = *fmt++;
continue;
}
if (sign) {
if (i64 < 0) {
*buf++ = '-';
ui64 = (uint64_t) -i64;
} else {
ui64 = (uint64_t) i64;
}
}
buf = ngx_sprintf_num(buf, last, ui64, zero, hex, width);
fmt++;
} else {
*buf++ = *fmt++;
}
}
return buf;
}
static u_char *
ngx_sprintf_num(u_char *buf, u_char *last, uint64_t ui64, u_char zero,
ngx_uint_t hexadecimal, ngx_uint_t width)
{
u_char *p, temp[NGX_INT64_LEN + 1];
/*
* we need temp[NGX_INT64_LEN] only,
* but icc issues the warning
*/
size_t len;
uint32_t ui32;
static u_char hex[] = "0123456789abcdef";
static u_char HEX[] = "0123456789ABCDEF";
p = temp + NGX_INT64_LEN;
if (hexadecimal == 0) {
if (ui64 <= (uint64_t) NGX_MAX_UINT32_VALUE) {
/*
* To divide 64-bit numbers and to find remainders
* on the x86 platform gcc and icc call the libc functions
* [u]divdi3() and [u]moddi3(), they call another function
* in its turn. On FreeBSD it is the qdivrem() function,
* its source code is about 170 lines of the code.
* The glibc counterpart is about 150 lines of the code.
*
* For 32-bit numbers and some divisors gcc and icc use
* a inlined multiplication and shifts. For example,
* unsigned "i32 / 10" is compiled to
*
* (i32 * 0xCCCCCCCD) >> 35
*/
ui32 = (uint32_t) ui64;
do {
*--p = (u_char) (ui32 % 10 + '0');
} while (ui32 /= 10);
} else {
do {
*--p = (u_char) (ui64 % 10 + '0');
} while (ui64 /= 10);
}
} else if (hexadecimal == 1) {
do {
/* the "(uint32_t)" cast disables the BCC's warning */
*--p = hex[(uint32_t) (ui64 & 0xf)];
} while (ui64 >>= 4);
} else { /* hexadecimal == 2 */
do {
/* the "(uint32_t)" cast disables the BCC's warning */
*--p = HEX[(uint32_t) (ui64 & 0xf)];
} while (ui64 >>= 4);
}
/* zero or space padding */
len = (temp + NGX_INT64_LEN) - p;
while (len++ < width && buf < last) {
*buf++ = zero;
}
/* number safe copy */
len = (temp + NGX_INT64_LEN) - p;
if (buf + len > last) {
len = last - buf;
}
return ngx_cpymem(buf, p, len);
}
static u_char *
ngx_sprintf_str(u_char *buf, u_char *last, u_char *src, size_t len,
ngx_uint_t hexadecimal)
{
static u_char hex[] = "0123456789abcdef";
static u_char HEX[] = "0123456789ABCDEF";
if (hexadecimal == 0) {
if (len == (size_t) -1) {
while (*src && buf < last) {
*buf++ = *src++;
}
} else {
len = ngx_min((size_t) (last - buf), len);
buf = ngx_cpymem(buf, src, len);
}
} else if (hexadecimal == 1) {
if (len == (size_t) -1) {
while (*src && buf < last - 1) {
*buf++ = hex[*src >> 4];
*buf++ = hex[*src++ & 0xf];
}
} else {
while (len-- && buf < last - 1) {
*buf++ = hex[*src >> 4];
*buf++ = hex[*src++ & 0xf];
}
}
} else { /* hexadecimal == 2 */
if (len == (size_t) -1) {
while (*src && buf < last - 1) {
*buf++ = HEX[*src >> 4];
*buf++ = HEX[*src++ & 0xf];
}
} else {
while (len-- && buf < last - 1) {
*buf++ = HEX[*src >> 4];
*buf++ = HEX[*src++ & 0xf];
}
}
}
return buf;
}
/*
* We use ngx_strcasecmp()/ngx_strncasecmp() for 7-bit ASCII strings only,
* and implement our own ngx_strcasecmp()/ngx_strncasecmp()
* to avoid libc locale overhead. Besides, we use the ngx_uint_t's
* instead of the u_char's, because they are slightly faster.
*/
ngx_int_t
ngx_strcasecmp(u_char *s1, u_char *s2)
{
ngx_uint_t c1, c2;
for ( ;; ) {
c1 = (ngx_uint_t) *s1++;
c2 = (ngx_uint_t) *s2++;
c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
if (c1 == c2) {
if (c1) {
continue;
}
return 0;
}
return c1 - c2;
}
}
ngx_int_t
ngx_strncasecmp(u_char *s1, u_char *s2, size_t n)
{
ngx_uint_t c1, c2;
while (n) {
c1 = (ngx_uint_t) *s1++;
c2 = (ngx_uint_t) *s2++;
c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
if (c1 == c2) {
if (c1) {
n--;
continue;
}
return 0;
}
return c1 - c2;
}
return 0;
}
u_char *
ngx_strnstr(u_char *s1, char *s2, size_t len)
{
u_char c1, c2;
size_t n;
c2 = *(u_char *) s2++;
n = ngx_strlen(s2);
do {
do {
if (len-- == 0) {
return NULL;
}
c1 = *s1++;
if (c1 == 0) {
return NULL;
}
} while (c1 != c2);
if (n > len) {
return NULL;
}
} while (ngx_strncmp(s1, (u_char *) s2, n) != 0);
return --s1;
}
/*
* ngx_strstrn() and ngx_strcasestrn() are intended to search for static
* substring with known length in null-terminated string. The argument n
* must be length of the second substring - 1.
*/
u_char *
ngx_strstrn(u_char *s1, char *s2, size_t n)
{
u_char c1, c2;
c2 = *(u_char *) s2++;
do {
do {
c1 = *s1++;
if (c1 == 0) {
return NULL;
}
} while (c1 != c2);
} while (ngx_strncmp(s1, (u_char *) s2, n) != 0);
return --s1;
}
u_char *
ngx_strcasestrn(u_char *s1, char *s2, size_t n)
{
ngx_uint_t c1, c2;
c2 = (ngx_uint_t) *s2++;
c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
do {
do {
c1 = (ngx_uint_t) *s1++;
if (c1 == 0) {
return NULL;
}
c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
} while (c1 != c2);
} while (ngx_strncasecmp(s1, (u_char *) s2, n) != 0);
return --s1;
}
/*
* ngx_strlcasestrn() is intended to search for static substring
* with known length in string until the argument last. The argument n
* must be length of the second substring - 1.
*/
u_char *
ngx_strlcasestrn(u_char *s1, u_char *last, u_char *s2, size_t n)
{
ngx_uint_t c1, c2;
c2 = (ngx_uint_t) *s2++;
c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
last -= n;
do {
do {
if (s1 >= last) {
return NULL;
}
c1 = (ngx_uint_t) *s1++;
c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
} while (c1 != c2);
} while (ngx_strncasecmp(s1, s2, n) != 0);
return --s1;
}
ngx_int_t
ngx_rstrncmp(u_char *s1, u_char *s2, size_t n)
{
if (n == 0) {
return 0;
}
n--;
for ( ;; ) {
if (s1[n] != s2[n]) {
return s1[n] - s2[n];
}
if (n == 0) {
return 0;
}
n--;
}
}
ngx_int_t
ngx_rstrncasecmp(u_char *s1, u_char *s2, size_t n)
{
u_char c1, c2;
if (n == 0) {
return 0;
}
n--;
for ( ;; ) {
c1 = s1[n];
if (c1 >= 'a' && c1 <= 'z') {
c1 -= 'a' - 'A';
}
c2 = s2[n];
if (c2 >= 'a' && c2 <= 'z') {
c2 -= 'a' - 'A';
}
if (c1 != c2) {
return c1 - c2;
}
if (n == 0) {
return 0;
}
n--;
}
}
ngx_int_t
ngx_memn2cmp(u_char *s1, u_char *s2, size_t n1, size_t n2)
{
size_t n;
ngx_int_t m, z;
if (n1 <= n2) {
n = n1;
z = -1;
} else {
n = n2;
z = 1;
}
m = ngx_memcmp(s1, s2, n);
if (m || n1 == n2) {
return m;
}
return z;
}
ngx_int_t
ngx_dns_strcmp(u_char *s1, u_char *s2)
{
ngx_uint_t c1, c2;
for ( ;; ) {
c1 = (ngx_uint_t) *s1++;
c2 = (ngx_uint_t) *s2++;
c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
if (c1 == c2) {
if (c1) {
continue;
}
return 0;
}
/* in ASCII '.' > '-', but we need '.' to be the lowest character */
c1 = (c1 == '.') ? ' ' : c1;
c2 = (c2 == '.') ? ' ' : c2;
return c1 - c2;
}
}
ngx_int_t
ngx_filename_cmp(u_char *s1, u_char *s2, size_t n)
{
ngx_uint_t c1, c2;
while (n) {
c1 = (ngx_uint_t) *s1++;
c2 = (ngx_uint_t) *s2++;
#if (NGX_HAVE_CASELESS_FILESYSTEM)
c1 = tolower(c1);
c2 = tolower(c2);
#endif
if (c1 == c2) {
if (c1) {
n--;
continue;
}
return 0;
}
/* we need '/' to be the lowest character */
if (c1 == 0 || c2 == 0) {
return c1 - c2;
}
c1 = (c1 == '/') ? 0 : c1;
c2 = (c2 == '/') ? 0 : c2;
return c1 - c2;
}
return 0;
}
ngx_int_t
ngx_atoi(u_char *line, size_t n)
{
ngx_int_t value, cutoff, cutlim;
if (n == 0) {
return NGX_ERROR;
}
cutoff = NGX_MAX_INT_T_VALUE / 10;
cutlim = NGX_MAX_INT_T_VALUE % 10;
for (value = 0; n--; line++) {
if (*line < '0' || *line > '9') {
return NGX_ERROR;
}
if (value >= cutoff && (value > cutoff || *line - '0' > cutlim)) {
return NGX_ERROR;
}
value = value * 10 + (*line - '0');
}
return value;
}
/* parse a fixed point number, e.g., ngx_atofp("10.5", 4, 2) returns 1050 */
ngx_int_t
ngx_atofp(u_char *line, size_t n, size_t point)
{
ngx_int_t value, cutoff, cutlim;
ngx_uint_t dot;