posix getcwd: split from main

Author: cirosantilli

posix/README.md

@@ -34,6 +34,8 @@
         1. [gethostbyname](gethostbyname.c)
         1. [gethostname](gethostname.c)
         1. [getservbyport](getservbyport.c)
+1.  Process information
+    1.  [getcwd](getcwd.c)
 1.  Signal
     1.  [Kill](kill.c)
     1.  Interactive

posix/getcwd.c

@@ -0,0 +1,25 @@
+/* https://stackoverflow.com/questions/16285623/pwd-to-get-path-to-the-current-file/54155296#54155296 */
+
+#define _XOPEN_SOURCE 700
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(void) {
+    long n;
+    char *buf;
+
+    n = pathconf(".", _PC_PATH_MAX);
+    assert(n != -1);
+    buf = malloc(n * sizeof(*buf));
+    assert(buf);
+    if (getcwd(buf, n) == NULL) {
+        perror("getcwd");
+        exit(EXIT_FAILURE);
+    } else {
+        printf("%s\n", buf);
+    }
+    free(buf);
+    return EXIT_SUCCESS;
+}

posix/main.c

@@ -1211,27 +1211,6 @@ int main(void) {
         printf("geteuid() = %ju\n",  (uintmax_t)euid     );
         printf("getegid() = %ju\n",  (uintmax_t)egid     );
         printf("getppid() = %ju\n",  (uintmax_t)getppid());
-
-        /*
-        # getcwd
-
-            pwd
-
-        # root directory
-
-            As of POSIX 7, this concept is not available.
-
-            It is implemented as a Glibc extension under `_BSD_SOURCE`.
-        */
-        {
-            const int n = 1 << 10;
-            char buf[n];
-            if (getcwd(buf, n) == NULL) {
-                perror("getcwd");
-            } else {
-                printf("getcwd() = %s\n", buf);
-            }
-        }
     }
 
     /*