Updated: April 19, 2023 |
Convert a numeric network address to a string
#include <sys/socket.h> #include <arpa/inet.h> const char * inet_ntop( int af, const void * src, char * dst, socklen_t size );
The inet_ntop() function converts a numeric network address pointed to by src into a text string in the buffer pointed to by dst.
A pointer to the buffer containing the text version of the address, or NULL if an error occurred (errno is set).
#include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <arpa/inet.h> #include <errno.h> #define INADDR "10.1.0.29" #define IN6ADDR "DEAD:BEEF:7654:3210:FEDC:3210:7654:BA98" int main() { struct in_addr inaddr; struct in6_addr in6addr; char buf[INET_ADDRSTRLEN], buf6[INET6_ADDRSTRLEN]; int rval; if ( (rval = inet_pton(AF_INET, INADDR, &inaddr)) == 0) { printf("Invalid address: %s\n", INADDR); exit(EXIT_FAILURE); } else if (rval == -1) { perror("inet_pton"); exit(EXIT_FAILURE); } if (inet_ntop(AF_INET, &inaddr, buf, sizeof(buf)) != NULL) printf("inet addr: %s\n", buf); else { perror("inet_ntop"); exit(EXIT_FAILURE); } if ( (rval = inet_pton(AF_INET6, IN6ADDR, &in6addr)) == 0) { printf("Invalid address: %s\n", IN6ADDR); exit(EXIT_FAILURE); } else if (rval == -1) { perror("inet_pton"); exit(EXIT_FAILURE); } if (inet_ntop(AF_INET6, &in6addr, buf6, sizeof(buf6)) != NULL) printf("inet6 addr: %s\n", buf6); else { perror("inet_ntop"); exit(EXIT_FAILURE); } return(EXIT_SUCCESS); }
Safety: | |
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Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |