Update examples
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176
README.md
176
README.md
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@ -1,71 +1,44 @@
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## About
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isinetaddr is a simple C library that provides an interface that can
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be used to validate an IPv(<b>4</b>|<b>6</b>) address (with optional
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support for CIDR notation included). The library is guided by easy to
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extend [testcases](test/) that help verify safety and correctness.
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isinetaddr is a clang library that provides a set of functions for
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IP address validation. The library is guided by [testcases](test/)
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that help verify safety and correctness.
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## Examples
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### IPv4
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### isinetaddr4
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The following example demonstrates the `isinetaddr4` function with
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both valid and invalid inputs. The `isinetaddr4` function returns `true`
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when the input given is a valid IPv4 address, and otherwise returns `false`.
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The `isinetaddr4` function returns `true` when given a valid IPv4 address:
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```C
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#include <isinetaddr.h>
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "127.0.0.1", "1.1.1.1", "0.0.0.0" };
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const char *invalid[] = { "foobar", "0.0.0.0.0", NULL };
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void validate(const char *str);
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const char *ipv4[] = {
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/* valid */
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"127.0.0.1", "1.1.1.1", "0.0.0.0",
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/* invalid */
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"0.0.0.0.0", "foobar"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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}
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void
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validate(const char *str)
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{
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if (isinetaddr4(str)) {
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printf("%s is a valid IPv4 address.\n", str);
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} else {
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printf("%s is an invalid IPv4 address.\n", str);
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for (int i = 0; i < 5; i++) {
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if (isinetaddr4(ipv4[i])) {
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printf("%s is a valid IPv4 address.\n", ipv4[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv4[i]);
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}
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}
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return (EXIT_SUCCESS);
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}
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```
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Expected output:
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### iscidraddr4
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```
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$ cc -Iinclude src/*.c share/isinetaddr/examples/isinetaddr4.c -o example
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$ ./example
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// valid
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127.0.0.1 is a valid IPv4 address.
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1.1.1.1 is a valid IPv4 address.
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0.0.0.0 is a valid IPv4 address.
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// invalid
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foobar is an invalid IPv4 address.
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0.0.0.0.0 is an invalid IPv4 address.
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(null) is an invalid IPv4 address.
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```
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### CIDR notation (IPv4)
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The `iscidraddr4` function supports the same feature set as `isinetaddr4`, and
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in addition supports
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The `iscidraddr4` function supports the same features as `isinetaddr4` plus
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[CIDR notation](https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#CIDR_notation).
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The following example builds on the previous example:
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@ -74,109 +47,62 @@ The following example builds on the previous example:
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "127.0.0.1", "192.168.2.1/32", "192.168.2.1/0" };
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const char *invalid[] = { "foobar", "0.0.0.0.0", "192.168.2.1/33" };
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void validate(const char *str);
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const char *ipv4[] = {
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/* valid */
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"127.0.0.1", "192.168.2.1/32", "192.168.2.1/0",
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/* invalid */
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"192.168.2.1/33", "foobar"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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}
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void
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validate(const char *str)
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{
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if (iscidraddr4(str)) {
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printf("%s is a valid IPv4 address.\n", str);
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} else {
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printf("%s is an invalid IPv4 address.\n", str);
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for (int i = 0; i < 5; i++) {
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if (iscidraddr4(ipv4[i])) {
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printf("%s is a valid IPv4 address.\n", ipv4[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv4[i]);
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}
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}
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return (EXIT_SUCCESS);
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}
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```
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Expected output:
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### isinetaddr6
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```
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$ cc -Iinclude src/*.c share/isinetaddr/examples/iscidraddr4.c -o example
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$ ./example
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// valid
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127.0.0.1 is a valid IPv4 address.
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192.168.2.1/32 is a valid IPv4 address.
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192.168.2.1/0 is a valid IPv4 address.
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// invalid
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foobar is an invalid IPv4 address.
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0.0.0.0.0 is an invalid IPv4 address.
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192.168.2.1/33 is an invalid IPv4 address.
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```
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### IPv6
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The following example demonstrates the `isinetaddr6` function with
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both valid and invalid inputs. The `isinetaddr6` function returns `true`
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when the input given is a valid IPv6 address, and otherwise returns `false`.
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The `isinetaddr6` function returns `true` when given a valid IPv6 address:
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```C
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#include <isinetaddr.h>
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "::", "::1", "0000:0000:0000:0000:0000:0000:0000:0000" };
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const char *invalid[] = { "foobar", "00:::0", NULL };
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void validate(const char *str);
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const char *ipv6[] = {
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/* valid */
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"::", "::1", "0000:0000:0000:0000:0000:0000:0000:0000",
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/* invalid */
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"foobar", "00:::0"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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for (int i = 0; i < 5; i++) {
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if (isinetaddr6(ipv6[i])) {
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printf("%s is a valid IPv4 address.\n", ipv6[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv6[i]);
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}
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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return (EXIT_SUCCESS);
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}
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void
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validate(const char *str)
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{
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if (isinetaddr6(str)) {
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printf("%s is a valid IPv6 address.\n", str);
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} else {
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printf("%s is an invalid IPv6 address.\n", str);
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}
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}
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```
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Expected output:
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```
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$ cc -Iinclude src/*.c share/isinetaddr/examples/isinetaddr6.c -o example
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$ ./example
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// valid
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:: is a valid IPv6 address.
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::1 is a valid IPv6 address.
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0000:0000:0000:0000:0000:0000:0000:0000 is a valid IPv6 address.
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// invalid
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foobar is an invalid IPv6 address.
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00:::0 is an invalid IPv6 address.
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(null) is an invalid IPv6 address.
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```
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## Sources
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* [Source code (GitHub)](https://github.com/0x1eef/isinetaddr#readme)
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* [Source code (GitLab)](https://gitlab.com/0x1eef/isinetaddr#about)
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* [GitHub](https://github.com/0x1eef/isinetaddr#readme)
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* [GitLab](https://gitlab.com/0x1eef/isinetaddr#about)
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## <a id="license"> License </a>
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "127.0.0.1", "192.168.2.1/32", "192.168.2.1/0" };
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const char *invalid[] = { "foobar", "0.0.0.0.0", "192.168.2.1/33" };
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void validate(const char *str);
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const char *ipv4[] = {
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/* valid */
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"127.0.0.1", "192.168.2.1/32", "192.168.2.1/0",
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/* invalid */
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"192.168.2.1/33", "foobar"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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}
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void
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validate(const char *str)
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{
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if (iscidraddr4(str)) {
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printf("%s is a valid IPv4 address.\n", str);
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} else {
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printf("%s is an invalid IPv4 address.\n", str);
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for (int i = 0; i < 5; i++) {
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if (iscidraddr4(ipv4[i])) {
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printf("%s is a valid IPv4 address.\n", ipv4[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv4[i]);
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}
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}
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return (EXIT_SUCCESS);
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}
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "127.0.0.1", "1.1.1.1", "0.0.0.0" };
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const char *invalid[] = { "foobar", "0.0.0.0.0", NULL };
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void validate(const char *str);
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const char *ipv4[] = {
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/* valid */
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"127.0.0.1", "1.1.1.1", "0.0.0.0",
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/* invalid */
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"0.0.0.0.0", "foobar"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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}
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void
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validate(const char *str)
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{
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if (isinetaddr4(str)) {
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printf("%s is a valid IPv4 address.\n", str);
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} else {
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printf("%s is an invalid IPv4 address.\n", str);
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for (int i = 0; i < 5; i++) {
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if (isinetaddr4(ipv4[i])) {
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printf("%s is a valid IPv4 address.\n", ipv4[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv4[i]);
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}
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}
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return (EXIT_SUCCESS);
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}
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#include <stdio.h>
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#include <stdlib.h>
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const char *valid[] = { "::", "::1", "0000:0000:0000:0000:0000:0000:0000:0000" };
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const char *invalid[] = { "foobar", "00:::0", NULL };
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void validate(const char *str);
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const char *ipv6[] = {
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/* valid */
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"::", "::1", "0000:0000:0000:0000:0000:0000:0000:0000",
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/* invalid */
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"foobar", "00:::0"
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};
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int
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main(void)
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{
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printf("// valid\n");
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for (int i = 0; i < 3; i++) {
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validate(valid[i]);
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}
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printf("// invalid\n");
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for (int i = 0; i < 3; i++) {
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validate(invalid[i]);
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}
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return EXIT_SUCCESS;
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}
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void
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validate(const char *str)
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{
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if (isinetaddr6(str)) {
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printf("%s is a valid IPv6 address.\n", str);
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} else {
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printf("%s is an invalid IPv6 address.\n", str);
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for (int i = 0; i < 5; i++) {
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if (isinetaddr6(ipv6[i])) {
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printf("%s is a valid IPv4 address.\n", ipv6[i]);
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} else {
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printf("%s is an invalid IPv4 address.\n", ipv6[i]);
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}
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}
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return (EXIT_SUCCESS);
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}
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