Merge \"Add ctermid.\"

am: f3c39b26b5

Change-Id: Id6c4549a355d1d6db374be2962c1c9f988e6bc74

libc/include/stdio.h

@@ -226,6 +226,7 @@ int	 vsscanf(const char * __restrict, const char * __restrict, __va_list)
  */
 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE
 #define	L_ctermid	1024	/* size for ctermid(); PATH_MAX */
+char* ctermid(char*);
 
 FILE	*fdopen(int, const char *);
 int	 fileno(FILE *);

libc/libc.arm.brillo.map

@@ -1271,6 +1271,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.arm.map

@@ -1271,6 +1271,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.arm64.map

@@ -1194,6 +1194,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.map.txt

@@ -1296,6 +1296,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.mips.brillo.map

@@ -1255,6 +1255,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.mips.map

@@ -1255,6 +1255,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.mips64.map

@@ -1194,6 +1194,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.x86.brillo.map

@@ -1253,6 +1253,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.x86.map

@@ -1253,6 +1253,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/libc.x86_64.map

@@ -1194,6 +1194,7 @@ LIBC_O {
     catclose;
     catgets;
     catopen;
+    ctermid;
     endgrent;
     endpwent;
     futimes;

libc/stdio/stdio.cpp

@@ -36,6 +36,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
+#include <paths.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/param.h>
@@ -598,3 +599,7 @@ FILE* funopen64(const void* cookie,
   }
   return fp;
 }
+
+char* ctermid(char* s) {
+  return s ? strcpy(s, _PATH_TTY) : const_cast<char*>(_PATH_TTY);
+}

tests/stdio_test.cpp

@@ -1297,3 +1297,11 @@ TEST(STDIO_TEST, fseek_fseeko_EINVAL) {
 
   fclose(fp);
 }
+
+TEST(STDIO_TEST, ctermid) {
+  ASSERT_STREQ("/dev/tty", ctermid(nullptr));
+
+  char buf[L_ctermid] = {};
+  ASSERT_EQ(buf, ctermid(buf));
+  ASSERT_STREQ("/dev/tty", buf);
+}