nginx/src/core/ngx_inet.c

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#include <ngx_config.h>
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#include <ngx_core.h>
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ngx_inline static size_t ngx_sprint_uchar(u_char *text, u_char c, size_t len)
{
size_t n;
ngx_uint_t c1, c2;
n = 0;
if (len == n) {
return n;
}
c1 = c / 100;
if (c1) {
*text++ = (u_char) (c1 + '0');
n++;
if (len == n) {
return n;
}
}
c2 = (c % 100) / 10;
if (c1 || c2) {
*text++ = (u_char) (c2 + '0');
n++;
if (len == n) {
return n;
}
}
c2 = c % 10;
*text++ = (u_char) (c2 + '0');
n++;
return n;
}
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/* AF_INET only */
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size_t ngx_sock_ntop(int family, struct sockaddr *addr, u_char *text,
size_t len)
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{
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u_char *p;
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size_t n;
ngx_uint_t i;
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struct sockaddr_in *addr_in;
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if (len == 0) {
return 0;
}
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if (family != AF_INET) {
return 0;
}
addr_in = (struct sockaddr_in *) addr;
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p = (u_char *) &addr_in->sin_addr;
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if (len > INET_ADDRSTRLEN) {
len = INET_ADDRSTRLEN;
}
n = ngx_sprint_uchar(text, p[0], len);
i = 1;
do {
if (len == n) {
text[n - 1] = '\0';
return n;
}
text[n++] = '.';
if (len == n) {
text[n - 1] = '\0';
return n;
}
n += ngx_sprint_uchar(&text[n], p[i++], len - n);
} while (i < 4);
if (len == n) {
text[n] = '\0';
return n;
}
text[n] = '\0';
return n;
#if 0
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return ngx_snprintf((char *) text,
len > INET_ADDRSTRLEN ? INET_ADDRSTRLEN : len,
"%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
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#endif
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}
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size_t ngx_inet_ntop(int family, void *addr, u_char *text, size_t len)
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{
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u_char *p;
size_t n;
ngx_uint_t i;
if (len == 0) {
return 0;
}
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if (family != AF_INET) {
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return 0;
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}
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p = (u_char *) addr;
if (len > INET_ADDRSTRLEN) {
len = INET_ADDRSTRLEN;
}
n = ngx_sprint_uchar(text, p[0], len);
i = 1;
do {
if (len == n) {
text[n - 1] = '\0';
return n;
}
text[n++] = '.';
if (len == n) {
text[n - 1] = '\0';
return n;
}
n += ngx_sprint_uchar(&text[n], p[i++], len - n);
} while (i < 4);
if (len == n) {
text[n] = '\0';
return n;
}
text[n] = '\0';
return n;
#if 0
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return ngx_snprintf((char *) text,
len > INET_ADDRSTRLEN ? INET_ADDRSTRLEN : len,
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"%u.%u.%u.%u", p[0], p[1], p[2], p[3]);
#endif
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}